cmd/blsync, beacon/light: beacon chain light client (#28822)

Here we add a beacon chain light client for use by geth.

Geth can now be configured to run against a beacon chain API endpoint,
without pointing a CL to it. To set this up, use the `--beacon.api` flag. Information
provided by the beacon chain is verified, i.e. geth does not blindly trust the beacon
API endpoint in this mode. The root of trust are the beacon chain 'sync committees'.

The configured beacon API endpoint must provide light client data. At this time, only
Lodestar and Nimbus provide the necessary APIs.

There is also a standalone tool, cmd/blsync, which uses the beacon chain light client
to drive any EL implementation via its engine API.

---------

Co-authored-by: Felix Lange <fjl@twurst.com>
pull/29184/head
Felföldi Zsolt 9 months ago committed by GitHub
parent d8e0807da2
commit aadcb88675
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
  1. 203
      beacon/blsync/block_sync.go
  2. 160
      beacon/blsync/block_sync_test.go
  3. 103
      beacon/blsync/client.go
  4. 113
      beacon/blsync/config.go
  5. 103
      beacon/light/api/api_server.go
  6. 496
      beacon/light/api/light_api.go
  7. 25
      beacon/light/committee_chain.go
  8. 4
      beacon/light/committee_chain_test.go
  9. 150
      beacon/light/head_tracker.go
  10. 401
      beacon/light/request/scheduler.go
  11. 122
      beacon/light/request/scheduler_test.go
  12. 439
      beacon/light/request/server.go
  13. 158
      beacon/light/request/server_test.go
  14. 176
      beacon/light/sync/head_sync.go
  15. 151
      beacon/light/sync/head_sync_test.go
  16. 254
      beacon/light/sync/test_helpers.go
  17. 42
      beacon/light/sync/types.go
  18. 299
      beacon/light/sync/update_sync.go
  19. 219
      beacon/light/sync/update_sync_test.go
  20. 2
      beacon/params/params.go
  21. 56
      beacon/types/light_sync.go
  22. 69
      cmd/blsync/engine_api.go
  23. 125
      cmd/blsync/main.go
  24. 3
      cmd/geth/config.go
  25. 8
      cmd/geth/main.go
  26. 53
      cmd/utils/flags.go
  27. 88
      eth/catalyst/blsync.go
  28. 5
      go.mod
  29. 16
      go.sum
  30. 1
      internal/flags/categories.go
  31. 24
      node/node.go

@ -0,0 +1,203 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package blsync
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/beacon/engine"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/light/sync"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/lru"
ctypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/trie"
"github.com/holiman/uint256"
"github.com/protolambda/zrnt/eth2/beacon/capella"
"github.com/protolambda/zrnt/eth2/configs"
"github.com/protolambda/ztyp/tree"
)
// beaconBlockSync implements request.Module; it fetches the beacon blocks belonging
// to the validated and prefetch heads.
type beaconBlockSync struct {
recentBlocks *lru.Cache[common.Hash, *capella.BeaconBlock]
locked map[common.Hash]request.ServerAndID
serverHeads map[request.Server]common.Hash
headTracker headTracker
lastHeadInfo types.HeadInfo
chainHeadFeed *event.Feed
}
type headTracker interface {
PrefetchHead() types.HeadInfo
ValidatedHead() (types.SignedHeader, bool)
ValidatedFinality() (types.FinalityUpdate, bool)
}
// newBeaconBlockSync returns a new beaconBlockSync.
func newBeaconBlockSync(headTracker headTracker, chainHeadFeed *event.Feed) *beaconBlockSync {
return &beaconBlockSync{
headTracker: headTracker,
chainHeadFeed: chainHeadFeed,
recentBlocks: lru.NewCache[common.Hash, *capella.BeaconBlock](10),
locked: make(map[common.Hash]request.ServerAndID),
serverHeads: make(map[request.Server]common.Hash),
}
}
// Process implements request.Module.
func (s *beaconBlockSync) Process(requester request.Requester, events []request.Event) {
for _, event := range events {
switch event.Type {
case request.EvResponse, request.EvFail, request.EvTimeout:
sid, req, resp := event.RequestInfo()
blockRoot := common.Hash(req.(sync.ReqBeaconBlock))
if resp != nil {
s.recentBlocks.Add(blockRoot, resp.(*capella.BeaconBlock))
}
if s.locked[blockRoot] == sid {
delete(s.locked, blockRoot)
}
case sync.EvNewHead:
s.serverHeads[event.Server] = event.Data.(types.HeadInfo).BlockRoot
case request.EvUnregistered:
delete(s.serverHeads, event.Server)
}
}
s.updateEventFeed()
// request validated head block if unavailable and not yet requested
if vh, ok := s.headTracker.ValidatedHead(); ok {
s.tryRequestBlock(requester, vh.Header.Hash(), false)
}
// request prefetch head if the given server has announced it
if prefetchHead := s.headTracker.PrefetchHead().BlockRoot; prefetchHead != (common.Hash{}) {
s.tryRequestBlock(requester, prefetchHead, true)
}
}
func (s *beaconBlockSync) tryRequestBlock(requester request.Requester, blockRoot common.Hash, needSameHead bool) {
if _, ok := s.recentBlocks.Get(blockRoot); ok {
return
}
if _, ok := s.locked[blockRoot]; ok {
return
}
for _, server := range requester.CanSendTo() {
if needSameHead && (s.serverHeads[server] != blockRoot) {
continue
}
id := requester.Send(server, sync.ReqBeaconBlock(blockRoot))
s.locked[blockRoot] = request.ServerAndID{Server: server, ID: id}
return
}
}
func blockHeadInfo(block *capella.BeaconBlock) types.HeadInfo {
if block == nil {
return types.HeadInfo{}
}
return types.HeadInfo{Slot: uint64(block.Slot), BlockRoot: beaconBlockHash(block)}
}
// beaconBlockHash calculates the hash of a beacon block.
func beaconBlockHash(beaconBlock *capella.BeaconBlock) common.Hash {
return common.Hash(beaconBlock.HashTreeRoot(configs.Mainnet, tree.GetHashFn()))
}
// getExecBlock extracts the execution block from the beacon block's payload.
func getExecBlock(beaconBlock *capella.BeaconBlock) (*ctypes.Block, error) {
payload := &beaconBlock.Body.ExecutionPayload
txs := make([]*ctypes.Transaction, len(payload.Transactions))
for i, opaqueTx := range payload.Transactions {
var tx ctypes.Transaction
if err := tx.UnmarshalBinary(opaqueTx); err != nil {
return nil, fmt.Errorf("failed to parse tx %d: %v", i, err)
}
txs[i] = &tx
}
withdrawals := make([]*ctypes.Withdrawal, len(payload.Withdrawals))
for i, w := range payload.Withdrawals {
withdrawals[i] = &ctypes.Withdrawal{
Index: uint64(w.Index),
Validator: uint64(w.ValidatorIndex),
Address: common.Address(w.Address),
Amount: uint64(w.Amount),
}
}
wroot := ctypes.DeriveSha(ctypes.Withdrawals(withdrawals), trie.NewStackTrie(nil))
execHeader := &ctypes.Header{
ParentHash: common.Hash(payload.ParentHash),
UncleHash: ctypes.EmptyUncleHash,
Coinbase: common.Address(payload.FeeRecipient),
Root: common.Hash(payload.StateRoot),
TxHash: ctypes.DeriveSha(ctypes.Transactions(txs), trie.NewStackTrie(nil)),
ReceiptHash: common.Hash(payload.ReceiptsRoot),
Bloom: ctypes.Bloom(payload.LogsBloom),
Difficulty: common.Big0,
Number: new(big.Int).SetUint64(uint64(payload.BlockNumber)),
GasLimit: uint64(payload.GasLimit),
GasUsed: uint64(payload.GasUsed),
Time: uint64(payload.Timestamp),
Extra: []byte(payload.ExtraData),
MixDigest: common.Hash(payload.PrevRandao), // reused in merge
Nonce: ctypes.BlockNonce{}, // zero
BaseFee: (*uint256.Int)(&payload.BaseFeePerGas).ToBig(),
WithdrawalsHash: &wroot,
}
execBlock := ctypes.NewBlockWithHeader(execHeader).WithBody(txs, nil).WithWithdrawals(withdrawals)
if execBlockHash := execBlock.Hash(); execBlockHash != common.Hash(payload.BlockHash) {
return execBlock, fmt.Errorf("Sanity check failed, payload hash does not match (expected %x, got %x)", common.Hash(payload.BlockHash), execBlockHash)
}
return execBlock, nil
}
func (s *beaconBlockSync) updateEventFeed() {
head, ok := s.headTracker.ValidatedHead()
if !ok {
return
}
finality, ok := s.headTracker.ValidatedFinality() //TODO fetch directly if subscription does not deliver
if !ok || head.Header.Epoch() != finality.Attested.Header.Epoch() {
return
}
validatedHead := head.Header.Hash()
headBlock, ok := s.recentBlocks.Get(validatedHead)
if !ok {
return
}
headInfo := blockHeadInfo(headBlock)
if headInfo == s.lastHeadInfo {
return
}
s.lastHeadInfo = headInfo
// new head block and finality info available; extract executable data and send event to feed
execBlock, err := getExecBlock(headBlock)
if err != nil {
log.Error("Error extracting execution block from validated beacon block", "error", err)
return
}
s.chainHeadFeed.Send(types.ChainHeadEvent{
HeadBlock: engine.BlockToExecutableData(execBlock, nil, nil).ExecutionPayload,
Finalized: common.Hash(finality.Finalized.PayloadHeader.BlockHash),
})
}

@ -0,0 +1,160 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package blsync
import (
"testing"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/light/sync"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/event"
"github.com/protolambda/zrnt/eth2/beacon/capella"
"github.com/protolambda/zrnt/eth2/configs"
"github.com/protolambda/ztyp/tree"
)
var (
testServer1 = "testServer1"
testServer2 = "testServer2"
testBlock1 = &capella.BeaconBlock{
Slot: 123,
Body: capella.BeaconBlockBody{
ExecutionPayload: capella.ExecutionPayload{BlockNumber: 456},
},
}
testBlock2 = &capella.BeaconBlock{
Slot: 124,
Body: capella.BeaconBlockBody{
ExecutionPayload: capella.ExecutionPayload{BlockNumber: 457},
},
}
)
func init() {
eb1, _ := getExecBlock(testBlock1)
testBlock1.Body.ExecutionPayload.BlockHash = tree.Root(eb1.Hash())
eb2, _ := getExecBlock(testBlock2)
testBlock2.Body.ExecutionPayload.BlockHash = tree.Root(eb2.Hash())
}
func TestBlockSync(t *testing.T) {
ht := &testHeadTracker{}
eventFeed := new(event.Feed)
blockSync := newBeaconBlockSync(ht, eventFeed)
headCh := make(chan types.ChainHeadEvent, 16)
eventFeed.Subscribe(headCh)
ts := sync.NewTestScheduler(t, blockSync)
ts.AddServer(testServer1, 1)
ts.AddServer(testServer2, 1)
expHeadBlock := func(tci int, expHead *capella.BeaconBlock) {
var expNumber, headNumber uint64
if expHead != nil {
expNumber = uint64(expHead.Body.ExecutionPayload.BlockNumber)
}
select {
case event := <-headCh:
headNumber = event.HeadBlock.Number
default:
}
if headNumber != expNumber {
t.Errorf("Wrong head block in test case #%d (expected block number %d, got %d)", tci, expNumber, headNumber)
}
}
// no block requests expected until head tracker knows about a head
ts.Run(1)
expHeadBlock(1, nil)
// set block 1 as prefetch head, announced by server 2
head1 := blockHeadInfo(testBlock1)
ht.prefetch = head1
ts.ServerEvent(sync.EvNewHead, testServer2, head1)
// expect request to server 2 which has announced the head
ts.Run(2, testServer2, sync.ReqBeaconBlock(head1.BlockRoot))
// valid response
ts.RequestEvent(request.EvResponse, ts.Request(2, 1), testBlock1)
ts.AddAllowance(testServer2, 1)
ts.Run(3)
// head block still not expected as the fetched block is not the validated head yet
expHeadBlock(3, nil)
// set as validated head, expect no further requests but block 1 set as head block
ht.validated.Header = blockHeader(testBlock1)
ts.Run(4)
expHeadBlock(4, testBlock1)
// set block 2 as prefetch head, announced by server 1
head2 := blockHeadInfo(testBlock2)
ht.prefetch = head2
ts.ServerEvent(sync.EvNewHead, testServer1, head2)
// expect request to server 1
ts.Run(5, testServer1, sync.ReqBeaconBlock(head2.BlockRoot))
// req2 fails, no further requests expected because server 2 has not announced it
ts.RequestEvent(request.EvFail, ts.Request(5, 1), nil)
ts.Run(6)
// set as validated head before retrieving block; now it's assumed to be available from server 2 too
ht.validated.Header = blockHeader(testBlock2)
// expect req2 retry to server 2
ts.Run(7, testServer2, sync.ReqBeaconBlock(head2.BlockRoot))
// now head block should be unavailable again
expHeadBlock(4, nil)
// valid response, now head block should be block 2 immediately as it is already validated
ts.RequestEvent(request.EvResponse, ts.Request(7, 1), testBlock2)
ts.Run(8)
expHeadBlock(5, testBlock2)
}
func blockHeader(block *capella.BeaconBlock) types.Header {
return types.Header{
Slot: uint64(block.Slot),
ProposerIndex: uint64(block.ProposerIndex),
ParentRoot: common.Hash(block.ParentRoot),
StateRoot: common.Hash(block.StateRoot),
BodyRoot: common.Hash(block.Body.HashTreeRoot(configs.Mainnet, tree.GetHashFn())),
}
}
type testHeadTracker struct {
prefetch types.HeadInfo
validated types.SignedHeader
}
func (h *testHeadTracker) PrefetchHead() types.HeadInfo {
return h.prefetch
}
func (h *testHeadTracker) ValidatedHead() (types.SignedHeader, bool) {
return h.validated, h.validated.Header != (types.Header{})
}
// TODO add test case for finality
func (h *testHeadTracker) ValidatedFinality() (types.FinalityUpdate, bool) {
return types.FinalityUpdate{
Attested: types.HeaderWithExecProof{Header: h.validated.Header},
Finalized: types.HeaderWithExecProof{PayloadHeader: &capella.ExecutionPayloadHeader{}},
Signature: h.validated.Signature,
SignatureSlot: h.validated.SignatureSlot,
}, h.validated.Header != (types.Header{})
}

@ -0,0 +1,103 @@
// Copyright 2024 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package blsync
import (
"strings"
"github.com/ethereum/go-ethereum/beacon/light"
"github.com/ethereum/go-ethereum/beacon/light/api"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/light/sync"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/ethdb/memorydb"
"github.com/ethereum/go-ethereum/event"
"github.com/urfave/cli/v2"
)
type Client struct {
scheduler *request.Scheduler
chainHeadFeed *event.Feed
urls []string
customHeader map[string]string
}
func NewClient(ctx *cli.Context) *Client {
if !ctx.IsSet(utils.BeaconApiFlag.Name) {
utils.Fatalf("Beacon node light client API URL not specified")
}
var (
chainConfig = makeChainConfig(ctx)
customHeader = make(map[string]string)
)
for _, s := range ctx.StringSlice(utils.BeaconApiHeaderFlag.Name) {
kv := strings.Split(s, ":")
if len(kv) != 2 {
utils.Fatalf("Invalid custom API header entry: %s", s)
}
customHeader[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1])
}
// create data structures
var (
db = memorydb.New()
threshold = ctx.Int(utils.BeaconThresholdFlag.Name)
committeeChain = light.NewCommitteeChain(db, chainConfig.ChainConfig, threshold, !ctx.Bool(utils.BeaconNoFilterFlag.Name))
headTracker = light.NewHeadTracker(committeeChain, threshold)
)
headSync := sync.NewHeadSync(headTracker, committeeChain)
// set up scheduler and sync modules
chainHeadFeed := new(event.Feed)
scheduler := request.NewScheduler()
checkpointInit := sync.NewCheckpointInit(committeeChain, chainConfig.Checkpoint)
forwardSync := sync.NewForwardUpdateSync(committeeChain)
beaconBlockSync := newBeaconBlockSync(headTracker, chainHeadFeed)
scheduler.RegisterTarget(headTracker)
scheduler.RegisterTarget(committeeChain)
scheduler.RegisterModule(checkpointInit, "checkpointInit")
scheduler.RegisterModule(forwardSync, "forwardSync")
scheduler.RegisterModule(headSync, "headSync")
scheduler.RegisterModule(beaconBlockSync, "beaconBlockSync")
return &Client{
scheduler: scheduler,
urls: ctx.StringSlice(utils.BeaconApiFlag.Name),
customHeader: customHeader,
chainHeadFeed: chainHeadFeed,
}
}
// SubscribeChainHeadEvent allows callers to subscribe a provided channel to new
// head updates.
func (c *Client) SubscribeChainHeadEvent(ch chan<- types.ChainHeadEvent) event.Subscription {
return c.chainHeadFeed.Subscribe(ch)
}
func (c *Client) Start() {
c.scheduler.Start()
// register server(s)
for _, url := range c.urls {
beaconApi := api.NewBeaconLightApi(url, c.customHeader)
c.scheduler.RegisterServer(request.NewServer(api.NewApiServer(beaconApi), &mclock.System{}))
}
}
func (c *Client) Stop() {
c.scheduler.Stop()
}

@ -0,0 +1,113 @@
// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package blsync
import (
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/urfave/cli/v2"
)
// lightClientConfig contains beacon light client configuration
type lightClientConfig struct {
*types.ChainConfig
Checkpoint common.Hash
}
var (
MainnetConfig = lightClientConfig{
ChainConfig: (&types.ChainConfig{
GenesisValidatorsRoot: common.HexToHash("0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95"),
GenesisTime: 1606824023,
}).
AddFork("GENESIS", 0, []byte{0, 0, 0, 0}).
AddFork("ALTAIR", 74240, []byte{1, 0, 0, 0}).
AddFork("BELLATRIX", 144896, []byte{2, 0, 0, 0}).
AddFork("CAPELLA", 194048, []byte{3, 0, 0, 0}),
Checkpoint: common.HexToHash("0x388be41594ec7d6a6894f18c73f3469f07e2c19a803de4755d335817ed8e2e5a"),
}
SepoliaConfig = lightClientConfig{
ChainConfig: (&types.ChainConfig{
GenesisValidatorsRoot: common.HexToHash("0xd8ea171f3c94aea21ebc42a1ed61052acf3f9209c00e4efbaaddac09ed9b8078"),
GenesisTime: 1655733600,
}).
AddFork("GENESIS", 0, []byte{144, 0, 0, 105}).
AddFork("ALTAIR", 50, []byte{144, 0, 0, 112}).
AddFork("BELLATRIX", 100, []byte{144, 0, 0, 113}).
AddFork("CAPELLA", 56832, []byte{144, 0, 0, 114}),
Checkpoint: common.HexToHash("0x1005a6d9175e96bfbce4d35b80f468e9bff0b674e1e861d16e09e10005a58e81"),
}
GoerliConfig = lightClientConfig{
ChainConfig: (&types.ChainConfig{
GenesisValidatorsRoot: common.HexToHash("0x043db0d9a83813551ee2f33450d23797757d430911a9320530ad8a0eabc43efb"),
GenesisTime: 1614588812,
}).
AddFork("GENESIS", 0, []byte{0, 0, 16, 32}).
AddFork("ALTAIR", 36660, []byte{1, 0, 16, 32}).
AddFork("BELLATRIX", 112260, []byte{2, 0, 16, 32}).
AddFork("CAPELLA", 162304, []byte{3, 0, 16, 32}),
Checkpoint: common.HexToHash("0x53a0f4f0a378e2c4ae0a9ee97407eb69d0d737d8d8cd0a5fb1093f42f7b81c49"),
}
)
func makeChainConfig(ctx *cli.Context) lightClientConfig {
utils.CheckExclusive(ctx, utils.MainnetFlag, utils.GoerliFlag, utils.SepoliaFlag)
customConfig := ctx.IsSet(utils.BeaconConfigFlag.Name) || ctx.IsSet(utils.BeaconGenesisRootFlag.Name) || ctx.IsSet(utils.BeaconGenesisTimeFlag.Name)
var config lightClientConfig
switch {
case ctx.Bool(utils.MainnetFlag.Name):
config = MainnetConfig
case ctx.Bool(utils.SepoliaFlag.Name):
config = SepoliaConfig
case ctx.Bool(utils.GoerliFlag.Name):
config = GoerliConfig
default:
if !customConfig {
config = MainnetConfig
}
}
if customConfig && config.Forks != nil {
utils.Fatalf("Cannot use custom beacon chain config flags in combination with pre-defined network config")
}
if ctx.IsSet(utils.BeaconGenesisRootFlag.Name) {
if c, err := hexutil.Decode(ctx.String(utils.BeaconGenesisRootFlag.Name)); err == nil && len(c) <= 32 {
copy(config.GenesisValidatorsRoot[:len(c)], c)
} else {
utils.Fatalf("Invalid hex string", "beacon.genesis.gvroot", ctx.String(utils.BeaconGenesisRootFlag.Name), "error", err)
}
}
if ctx.IsSet(utils.BeaconGenesisTimeFlag.Name) {
config.GenesisTime = ctx.Uint64(utils.BeaconGenesisTimeFlag.Name)
}
if ctx.IsSet(utils.BeaconConfigFlag.Name) {
if err := config.ChainConfig.LoadForks(ctx.String(utils.BeaconConfigFlag.Name)); err != nil {
utils.Fatalf("Could not load beacon chain config file", "file name", ctx.String(utils.BeaconConfigFlag.Name), "error", err)
}
}
if ctx.IsSet(utils.BeaconCheckpointFlag.Name) {
if c, err := hexutil.Decode(ctx.String(utils.BeaconCheckpointFlag.Name)); err == nil && len(c) <= 32 {
copy(config.Checkpoint[:len(c)], c)
} else {
utils.Fatalf("Invalid hex string", "beacon.checkpoint", ctx.String(utils.BeaconCheckpointFlag.Name), "error", err)
}
}
return config
}

@ -0,0 +1,103 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package api
import (
"reflect"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/light/sync"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
)
// ApiServer is a wrapper around BeaconLightApi that implements request.requestServer.
type ApiServer struct {
api *BeaconLightApi
eventCallback func(event request.Event)
unsubscribe func()
}
// NewApiServer creates a new ApiServer.
func NewApiServer(api *BeaconLightApi) *ApiServer {
return &ApiServer{api: api}
}
// Subscribe implements request.requestServer.
func (s *ApiServer) Subscribe(eventCallback func(event request.Event)) {
s.eventCallback = eventCallback
listener := HeadEventListener{
OnNewHead: func(slot uint64, blockRoot common.Hash) {
log.Debug("New head received", "slot", slot, "blockRoot", blockRoot)
eventCallback(request.Event{Type: sync.EvNewHead, Data: types.HeadInfo{Slot: slot, BlockRoot: blockRoot}})
},
OnSignedHead: func(head types.SignedHeader) {
log.Debug("New signed head received", "slot", head.Header.Slot, "blockRoot", head.Header.Hash(), "signerCount", head.Signature.SignerCount())
eventCallback(request.Event{Type: sync.EvNewSignedHead, Data: head})
},
OnFinality: func(head types.FinalityUpdate) {
log.Debug("New finality update received", "slot", head.Attested.Slot, "blockRoot", head.Attested.Hash(), "signerCount", head.Signature.SignerCount())
eventCallback(request.Event{Type: sync.EvNewFinalityUpdate, Data: head})
},
OnError: func(err error) {
log.Warn("Head event stream error", "err", err)
},
}
s.unsubscribe = s.api.StartHeadListener(listener)
}
// SendRequest implements request.requestServer.
func (s *ApiServer) SendRequest(id request.ID, req request.Request) {
go func() {
var resp request.Response
var err error
switch data := req.(type) {
case sync.ReqUpdates:
log.Debug("Beacon API: requesting light client update", "reqid", id, "period", data.FirstPeriod, "count", data.Count)
var r sync.RespUpdates
r.Updates, r.Committees, err = s.api.GetBestUpdatesAndCommittees(data.FirstPeriod, data.Count)
resp = r
case sync.ReqHeader:
log.Debug("Beacon API: requesting header", "reqid", id, "hash", common.Hash(data))
resp, err = s.api.GetHeader(common.Hash(data))
case sync.ReqCheckpointData:
log.Debug("Beacon API: requesting checkpoint data", "reqid", id, "hash", common.Hash(data))
resp, err = s.api.GetCheckpointData(common.Hash(data))
case sync.ReqBeaconBlock:
log.Debug("Beacon API: requesting block", "reqid", id, "hash", common.Hash(data))
resp, err = s.api.GetBeaconBlock(common.Hash(data))
default:
}
if err != nil {
log.Warn("Beacon API request failed", "type", reflect.TypeOf(req), "reqid", id, "err", err)
s.eventCallback(request.Event{Type: request.EvFail, Data: request.RequestResponse{ID: id, Request: req}})
} else {
s.eventCallback(request.Event{Type: request.EvResponse, Data: request.RequestResponse{ID: id, Request: req, Response: resp}})
}
}()
}
// Unsubscribe implements request.requestServer.
// Note: Unsubscribe should not be called concurrently with Subscribe.
func (s *ApiServer) Unsubscribe() {
if s.unsubscribe != nil {
s.unsubscribe()
s.unsubscribe = nil
}
}

@ -0,0 +1,496 @@
// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more detaiapi.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package api
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"time"
"github.com/donovanhide/eventsource"
"github.com/ethereum/go-ethereum/beacon/merkle"
"github.com/ethereum/go-ethereum/beacon/params"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/protolambda/zrnt/eth2/beacon/capella"
"github.com/protolambda/zrnt/eth2/configs"
"github.com/protolambda/ztyp/tree"
)
var (
ErrNotFound = errors.New("404 Not Found")
ErrInternal = errors.New("500 Internal Server Error")
)
type CommitteeUpdate struct {
Version string
Update types.LightClientUpdate
NextSyncCommittee types.SerializedSyncCommittee
}
// See data structure definition here:
// https://github.com/ethereum/consensus-specs/blob/dev/specs/altair/light-client/sync-protocol.md#lightclientupdate
type committeeUpdateJson struct {
Version string `json:"version"`
Data committeeUpdateData `json:"data"`
}
type committeeUpdateData struct {
Header jsonBeaconHeader `json:"attested_header"`
NextSyncCommittee types.SerializedSyncCommittee `json:"next_sync_committee"`
NextSyncCommitteeBranch merkle.Values `json:"next_sync_committee_branch"`
FinalizedHeader *jsonBeaconHeader `json:"finalized_header,omitempty"`
FinalityBranch merkle.Values `json:"finality_branch,omitempty"`
SyncAggregate types.SyncAggregate `json:"sync_aggregate"`
SignatureSlot common.Decimal `json:"signature_slot"`
}
type jsonBeaconHeader struct {
Beacon types.Header `json:"beacon"`
}
type jsonHeaderWithExecProof struct {
Beacon types.Header `json:"beacon"`
Execution *capella.ExecutionPayloadHeader `json:"execution"`
ExecutionBranch merkle.Values `json:"execution_branch"`
}
// UnmarshalJSON unmarshals from JSON.
func (u *CommitteeUpdate) UnmarshalJSON(input []byte) error {
var dec committeeUpdateJson
if err := json.Unmarshal(input, &dec); err != nil {
return err
}
u.Version = dec.Version
u.NextSyncCommittee = dec.Data.NextSyncCommittee
u.Update = types.LightClientUpdate{
AttestedHeader: types.SignedHeader{
Header: dec.Data.Header.Beacon,
Signature: dec.Data.SyncAggregate,
SignatureSlot: uint64(dec.Data.SignatureSlot),
},
NextSyncCommitteeRoot: u.NextSyncCommittee.Root(),
NextSyncCommitteeBranch: dec.Data.NextSyncCommitteeBranch,
FinalityBranch: dec.Data.FinalityBranch,
}
if dec.Data.FinalizedHeader != nil {
u.Update.FinalizedHeader = &dec.Data.FinalizedHeader.Beacon
}
return nil
}
// fetcher is an interface useful for debug-harnessing the http api.
type fetcher interface {
Do(req *http.Request) (*http.Response, error)
}
// BeaconLightApi requests light client information from a beacon node REST API.
// Note: all required API endpoints are currently only implemented by Lodestar.
type BeaconLightApi struct {
url string
client fetcher
customHeaders map[string]string
}
func NewBeaconLightApi(url string, customHeaders map[string]string) *BeaconLightApi {
return &BeaconLightApi{
url: url,
client: &http.Client{
Timeout: time.Second * 10,
},
customHeaders: customHeaders,
}
}
func (api *BeaconLightApi) httpGet(path string) ([]byte, error) {
req, err := http.NewRequest("GET", api.url+path, nil)
if err != nil {
return nil, err
}
for k, v := range api.customHeaders {
req.Header.Set(k, v)
}
resp, err := api.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
switch resp.StatusCode {
case 200:
return io.ReadAll(resp.Body)
case 404:
return nil, ErrNotFound
case 500:
return nil, ErrInternal
default:
return nil, fmt.Errorf("unexpected error from API endpoint \"%s\": status code %d", path, resp.StatusCode)
}
}
func (api *BeaconLightApi) httpGetf(format string, params ...any) ([]byte, error) {
return api.httpGet(fmt.Sprintf(format, params...))
}
// GetBestUpdateAndCommittee fetches and validates LightClientUpdate for given
// period and full serialized committee for the next period (committee root hash
// equals update.NextSyncCommitteeRoot).
// Note that the results are validated but the update signature should be verified
// by the caller as its validity depends on the update chain.
func (api *BeaconLightApi) GetBestUpdatesAndCommittees(firstPeriod, count uint64) ([]*types.LightClientUpdate, []*types.SerializedSyncCommittee, error) {
resp, err := api.httpGetf("/eth/v1/beacon/light_client/updates?start_period=%d&count=%d", firstPeriod, count)
if err != nil {
return nil, nil, err
}
var data []CommitteeUpdate
if err := json.Unmarshal(resp, &data); err != nil {
return nil, nil, err
}
if len(data) != int(count) {
return nil, nil, errors.New("invalid number of committee updates")
}
updates := make([]*types.LightClientUpdate, int(count))
committees := make([]*types.SerializedSyncCommittee, int(count))
for i, d := range data {
if d.Update.AttestedHeader.Header.SyncPeriod() != firstPeriod+uint64(i) {
return nil, nil, errors.New("wrong committee update header period")
}
if err := d.Update.Validate(); err != nil {
return nil, nil, err
}
if d.NextSyncCommittee.Root() != d.Update.NextSyncCommitteeRoot {
return nil, nil, errors.New("wrong sync committee root")
}
updates[i], committees[i] = new(types.LightClientUpdate), new(types.SerializedSyncCommittee)
*updates[i], *committees[i] = d.Update, d.NextSyncCommittee
}
return updates, committees, nil
}
// GetOptimisticHeadUpdate fetches a signed header based on the latest available
// optimistic update. Note that the signature should be verified by the caller
// as its validity depends on the update chain.
//
// See data structure definition here:
// https://github.com/ethereum/consensus-specs/blob/dev/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
func (api *BeaconLightApi) GetOptimisticHeadUpdate() (types.SignedHeader, error) {
resp, err := api.httpGet("/eth/v1/beacon/light_client/optimistic_update")
if err != nil {
return types.SignedHeader{}, err
}
return decodeOptimisticHeadUpdate(resp)
}
func decodeOptimisticHeadUpdate(enc []byte) (types.SignedHeader, error) {
var data struct {
Data struct {
Header jsonBeaconHeader `json:"attested_header"`
Aggregate types.SyncAggregate `json:"sync_aggregate"`
SignatureSlot common.Decimal `json:"signature_slot"`
} `json:"data"`
}
if err := json.Unmarshal(enc, &data); err != nil {
return types.SignedHeader{}, err
}
if data.Data.Header.Beacon.StateRoot == (common.Hash{}) {
// workaround for different event encoding format in Lodestar
if err := json.Unmarshal(enc, &data.Data); err != nil {
return types.SignedHeader{}, err
}
}
if len(data.Data.Aggregate.Signers) != params.SyncCommitteeBitmaskSize {
return types.SignedHeader{}, errors.New("invalid sync_committee_bits length")
}
if len(data.Data.Aggregate.Signature) != params.BLSSignatureSize {
return types.SignedHeader{}, errors.New("invalid sync_committee_signature length")
}
return types.SignedHeader{
Header: data.Data.Header.Beacon,
Signature: data.Data.Aggregate,
SignatureSlot: uint64(data.Data.SignatureSlot),
}, nil
}
// GetFinalityUpdate fetches the latest available finality update.
//
// See data structure definition here:
// https://github.com/ethereum/consensus-specs/blob/dev/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
func (api *BeaconLightApi) GetFinalityUpdate() (types.FinalityUpdate, error) {
resp, err := api.httpGet("/eth/v1/beacon/light_client/finality_update")
if err != nil {
return types.FinalityUpdate{}, err
}
return decodeFinalityUpdate(resp)
}
func decodeFinalityUpdate(enc []byte) (types.FinalityUpdate, error) {
var data struct {
Data struct {
Attested jsonHeaderWithExecProof `json:"attested_header"`
Finalized jsonHeaderWithExecProof `json:"finalized_header"`
FinalityBranch merkle.Values `json:"finality_branch"`
Aggregate types.SyncAggregate `json:"sync_aggregate"`
SignatureSlot common.Decimal `json:"signature_slot"`
} `json:"data"`
}
if err := json.Unmarshal(enc, &data); err != nil {
return types.FinalityUpdate{}, err
}
if len(data.Data.Aggregate.Signers) != params.SyncCommitteeBitmaskSize {
return types.FinalityUpdate{}, errors.New("invalid sync_committee_bits length")
}
if len(data.Data.Aggregate.Signature) != params.BLSSignatureSize {
return types.FinalityUpdate{}, errors.New("invalid sync_committee_signature length")
}
return types.FinalityUpdate{
Attested: types.HeaderWithExecProof{
Header: data.Data.Attested.Beacon,
PayloadHeader: data.Data.Attested.Execution,
PayloadBranch: data.Data.Attested.ExecutionBranch,
},
Finalized: types.HeaderWithExecProof{
Header: data.Data.Finalized.Beacon,
PayloadHeader: data.Data.Finalized.Execution,
PayloadBranch: data.Data.Finalized.ExecutionBranch,
},
FinalityBranch: data.Data.FinalityBranch,
Signature: data.Data.Aggregate,
SignatureSlot: uint64(data.Data.SignatureSlot),
}, nil
}
// GetHead fetches and validates the beacon header with the given blockRoot.
// If blockRoot is null hash then the latest head header is fetched.
func (api *BeaconLightApi) GetHeader(blockRoot common.Hash) (types.Header, error) {
var blockId string
if blockRoot == (common.Hash{}) {
blockId = "head"
} else {
blockId = blockRoot.Hex()
}
resp, err := api.httpGetf("/eth/v1/beacon/headers/%s", blockId)
if err != nil {
return types.Header{}, err
}
var data struct {
Data struct {
Root common.Hash `json:"root"`
Canonical bool `json:"canonical"`
Header struct {
Message types.Header `json:"message"`
Signature hexutil.Bytes `json:"signature"`
} `json:"header"`
} `json:"data"`
}
if err := json.Unmarshal(resp, &data); err != nil {
return types.Header{}, err
}
header := data.Data.Header.Message
if blockRoot == (common.Hash{}) {
blockRoot = data.Data.Root
}
if header.Hash() != blockRoot {
return types.Header{}, errors.New("retrieved beacon header root does not match")
}
return header, nil
}
// GetCheckpointData fetches and validates bootstrap data belonging to the given checkpoint.
func (api *BeaconLightApi) GetCheckpointData(checkpointHash common.Hash) (*types.BootstrapData, error) {
resp, err := api.httpGetf("/eth/v1/beacon/light_client/bootstrap/0x%x", checkpointHash[:])
if err != nil {
return nil, err
}
// See data structure definition here:
// https://github.com/ethereum/consensus-specs/blob/dev/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
type bootstrapData struct {
Data struct {
Header jsonBeaconHeader `json:"header"`
Committee *types.SerializedSyncCommittee `json:"current_sync_committee"`
CommitteeBranch merkle.Values `json:"current_sync_committee_branch"`
} `json:"data"`
}
var data bootstrapData
if err := json.Unmarshal(resp, &data); err != nil {
return nil, err
}
if data.Data.Committee == nil {
return nil, errors.New("sync committee is missing")
}
header := data.Data.Header.Beacon
if header.Hash() != checkpointHash {
return nil, fmt.Errorf("invalid checkpoint block header, have %v want %v", header.Hash(), checkpointHash)
}
checkpoint := &types.BootstrapData{
Header: header,
CommitteeBranch: data.Data.CommitteeBranch,
CommitteeRoot: data.Data.Committee.Root(),
Committee: data.Data.Committee,
}
if err := checkpoint.Validate(); err != nil {
return nil, fmt.Errorf("invalid checkpoint: %w", err)
}
if checkpoint.Header.Hash() != checkpointHash {
return nil, errors.New("wrong checkpoint hash")
}
return checkpoint, nil
}
func (api *BeaconLightApi) GetBeaconBlock(blockRoot common.Hash) (*capella.BeaconBlock, error) {
resp, err := api.httpGetf("/eth/v2/beacon/blocks/0x%x", blockRoot)
if err != nil {
return nil, err
}
var beaconBlockMessage struct {
Data struct {
Message capella.BeaconBlock `json:"message"`
} `json:"data"`
}
if err := json.Unmarshal(resp, &beaconBlockMessage); err != nil {
return nil, fmt.Errorf("invalid block json data: %v", err)
}
beaconBlock := new(capella.BeaconBlock)
*beaconBlock = beaconBlockMessage.Data.Message
root := common.Hash(beaconBlock.HashTreeRoot(configs.Mainnet, tree.GetHashFn()))
if root != blockRoot {
return nil, fmt.Errorf("Beacon block root hash mismatch (expected: %x, got: %x)", blockRoot, root)
}
return beaconBlock, nil
}
func decodeHeadEvent(enc []byte) (uint64, common.Hash, error) {
var data struct {
Slot common.Decimal `json:"slot"`
Block common.Hash `json:"block"`
}
if err := json.Unmarshal(enc, &data); err != nil {
return 0, common.Hash{}, err
}
return uint64(data.Slot), data.Block, nil
}
type HeadEventListener struct {
OnNewHead func(slot uint64, blockRoot common.Hash)
OnSignedHead func(head types.SignedHeader)
OnFinality func(head types.FinalityUpdate)
OnError func(err error)
}
// StartHeadListener creates an event subscription for heads and signed (optimistic)
// head updates and calls the specified callback functions when they are received.
// The callbacks are also called for the current head and optimistic head at startup.
// They are never called concurrently.
func (api *BeaconLightApi) StartHeadListener(listener HeadEventListener) func() {
closeCh := make(chan struct{}) // initiate closing the stream
closedCh := make(chan struct{}) // stream closed (or failed to create)
stoppedCh := make(chan struct{}) // sync loop stopped
streamCh := make(chan *eventsource.Stream, 1)
go func() {
defer close(closedCh)
// when connected to a Lodestar node the subscription blocks until the
// first actual event arrives; therefore we create the subscription in
// a separate goroutine while letting the main goroutine sync up to the
// current head
req, err := http.NewRequest("GET", api.url+
"/eth/v1/events?topics=head&topics=light_client_optimistic_update&topics=light_client_finality_update", nil)
if err != nil {
listener.OnError(fmt.Errorf("error creating event subscription request: %v", err))
return
}
for k, v := range api.customHeaders {
req.Header.Set(k, v)
}
stream, err := eventsource.SubscribeWithRequest("", req)
if err != nil {
listener.OnError(fmt.Errorf("error creating event subscription: %v", err))
close(streamCh)
return
}
streamCh <- stream
<-closeCh
stream.Close()
}()
go func() {
defer close(stoppedCh)
if head, err := api.GetHeader(common.Hash{}); err == nil {
listener.OnNewHead(head.Slot, head.Hash())
}
if signedHead, err := api.GetOptimisticHeadUpdate(); err == nil {
listener.OnSignedHead(signedHead)
}
if finalityUpdate, err := api.GetFinalityUpdate(); err == nil {
listener.OnFinality(finalityUpdate)
}
stream := <-streamCh
if stream == nil {
return
}
for {
select {
case event, ok := <-stream.Events:
if !ok {
break
}
switch event.Event() {
case "head":
if slot, blockRoot, err := decodeHeadEvent([]byte(event.Data())); err == nil {
listener.OnNewHead(slot, blockRoot)
} else {
listener.OnError(fmt.Errorf("error decoding head event: %v", err))
}
case "light_client_optimistic_update":
if signedHead, err := decodeOptimisticHeadUpdate([]byte(event.Data())); err == nil {
listener.OnSignedHead(signedHead)
} else {
listener.OnError(fmt.Errorf("error decoding optimistic update event: %v", err))
}
case "light_client_finality_update":
if finalityUpdate, err := decodeFinalityUpdate([]byte(event.Data())); err == nil {
listener.OnFinality(finalityUpdate)
} else {
listener.OnError(fmt.Errorf("error decoding finality update event: %v", err))
}
default:
listener.OnError(fmt.Errorf("unexpected event: %s", event.Event()))
}
case err, ok := <-stream.Errors:
if !ok {
break
}
listener.OnError(err)
}
}
}()
return func() {
close(closeCh)
<-closedCh
<-stoppedCh
}
}

@ -70,6 +70,7 @@ type CommitteeChain struct {
committees *canonicalStore[*types.SerializedSyncCommittee]
fixedCommitteeRoots *canonicalStore[common.Hash]
committeeCache *lru.Cache[uint64, syncCommittee] // cache deserialized committees
changeCounter uint64
clock mclock.Clock // monotonic clock (simulated clock in tests)
unixNano func() int64 // system clock (simulated clock in tests)
@ -86,6 +87,11 @@ func NewCommitteeChain(db ethdb.KeyValueStore, config *types.ChainConfig, signer
return newCommitteeChain(db, config, signerThreshold, enforceTime, blsVerifier{}, &mclock.System{}, func() int64 { return time.Now().UnixNano() })
}
// NewTestCommitteeChain creates a new CommitteeChain for testing.
func NewTestCommitteeChain(db ethdb.KeyValueStore, config *types.ChainConfig, signerThreshold int, enforceTime bool, clock *mclock.Simulated) *CommitteeChain {
return newCommitteeChain(db, config, signerThreshold, enforceTime, dummyVerifier{}, clock, func() int64 { return int64(clock.Now()) })
}
// newCommitteeChain creates a new CommitteeChain with the option of replacing the
// clock source and signature verification for testing purposes.
func newCommitteeChain(db ethdb.KeyValueStore, config *types.ChainConfig, signerThreshold int, enforceTime bool, sigVerifier committeeSigVerifier, clock mclock.Clock, unixNano func() int64) *CommitteeChain {
@ -181,20 +187,20 @@ func (s *CommitteeChain) Reset() {
if err := s.rollback(0); err != nil {
log.Error("Error writing batch into chain database", "error", err)
}
s.changeCounter++
}
// CheckpointInit initializes a CommitteeChain based on the checkpoint.
// CheckpointInit initializes a CommitteeChain based on a checkpoint.
// Note: if the chain is already initialized and the committees proven by the
// checkpoint do match the existing chain then the chain is retained and the
// new checkpoint becomes fixed.
func (s *CommitteeChain) CheckpointInit(bootstrap *types.BootstrapData) error {
func (s *CommitteeChain) CheckpointInit(bootstrap types.BootstrapData) error {
s.chainmu.Lock()
defer s.chainmu.Unlock()
if err := bootstrap.Validate(); err != nil {
return err
}
period := bootstrap.Header.SyncPeriod()
if err := s.deleteFixedCommitteeRootsFrom(period + 2); err != nil {
s.Reset()
@ -215,6 +221,7 @@ func (s *CommitteeChain) CheckpointInit(bootstrap *types.BootstrapData) error {
s.Reset()
return err
}
s.changeCounter++
return nil
}
@ -367,6 +374,7 @@ func (s *CommitteeChain) InsertUpdate(update *types.LightClientUpdate, nextCommi
return ErrWrongCommitteeRoot
}
}
s.changeCounter++
if reorg {
if err := s.rollback(period + 1); err != nil {
return err
@ -405,6 +413,13 @@ func (s *CommitteeChain) NextSyncPeriod() (uint64, bool) {
return s.committees.periods.End - 1, true
}
func (s *CommitteeChain) ChangeCounter() uint64 {
s.chainmu.RLock()
defer s.chainmu.RUnlock()
return s.changeCounter
}
// rollback removes all committees and fixed roots from the given period and updates
// starting from the previous period.
func (s *CommitteeChain) rollback(period uint64) error {
@ -452,12 +467,12 @@ func (s *CommitteeChain) getSyncCommittee(period uint64) (syncCommittee, error)
if sc, ok := s.committees.get(s.db, period); ok {
c, err := s.sigVerifier.deserializeSyncCommittee(sc)
if err != nil {
return nil, fmt.Errorf("Sync committee #%d deserialization error: %v", period, err)
return nil, fmt.Errorf("sync committee #%d deserialization error: %v", period, err)
}
s.committeeCache.Add(period, c)
return c, nil
}
return nil, fmt.Errorf("Missing serialized sync committee #%d", period)
return nil, fmt.Errorf("missing serialized sync committee #%d", period)
}
// VerifySignedHeader returns true if the given signed header has a valid signature

@ -241,12 +241,12 @@ func newCommitteeChainTest(t *testing.T, config types.ChainConfig, signerThresho
signerThreshold: signerThreshold,
enforceTime: enforceTime,
}
c.chain = newCommitteeChain(c.db, &config, signerThreshold, enforceTime, dummyVerifier{}, c.clock, func() int64 { return int64(c.clock.Now()) })
c.chain = NewTestCommitteeChain(c.db, &config, signerThreshold, enforceTime, c.clock)
return c
}
func (c *committeeChainTest) reloadChain() {
c.chain = newCommitteeChain(c.db, &c.config, c.signerThreshold, c.enforceTime, dummyVerifier{}, c.clock, func() int64 { return int64(c.clock.Now()) })
c.chain = NewTestCommitteeChain(c.db, &c.config, c.signerThreshold, c.enforceTime, c.clock)
}
func (c *committeeChainTest) setClockPeriod(period float64) {

@ -0,0 +1,150 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package light
import (
"errors"
"sync"
"time"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/log"
)
// HeadTracker keeps track of the latest validated head and the "prefetch" head
// which is the (not necessarily validated) head announced by the majority of
// servers.
type HeadTracker struct {
lock sync.RWMutex
committeeChain *CommitteeChain
minSignerCount int
signedHead types.SignedHeader
hasSignedHead bool
finalityUpdate types.FinalityUpdate
hasFinalityUpdate bool
prefetchHead types.HeadInfo
changeCounter uint64
}
// NewHeadTracker creates a new HeadTracker.
func NewHeadTracker(committeeChain *CommitteeChain, minSignerCount int) *HeadTracker {
return &HeadTracker{
committeeChain: committeeChain,
minSignerCount: minSignerCount,
}
}
// ValidatedHead returns the latest validated head.
func (h *HeadTracker) ValidatedHead() (types.SignedHeader, bool) {
h.lock.RLock()
defer h.lock.RUnlock()
return h.signedHead, h.hasSignedHead
}
// ValidatedHead returns the latest validated head.
func (h *HeadTracker) ValidatedFinality() (types.FinalityUpdate, bool) {
h.lock.RLock()
defer h.lock.RUnlock()
return h.finalityUpdate, h.hasFinalityUpdate
}
// Validate validates the given signed head. If the head is successfully validated
// and it is better than the old validated head (higher slot or same slot and more
// signers) then ValidatedHead is updated. The boolean return flag signals if
// ValidatedHead has been changed.
func (h *HeadTracker) ValidateHead(head types.SignedHeader) (bool, error) {
h.lock.Lock()
defer h.lock.Unlock()
replace, err := h.validate(head, h.signedHead)
if replace {
h.signedHead, h.hasSignedHead = head, true
h.changeCounter++
}
return replace, err
}
func (h *HeadTracker) ValidateFinality(update types.FinalityUpdate) (bool, error) {
h.lock.Lock()
defer h.lock.Unlock()
replace, err := h.validate(update.SignedHeader(), h.finalityUpdate.SignedHeader())
if replace {
h.finalityUpdate, h.hasFinalityUpdate = update, true
h.changeCounter++
}
return replace, err
}
func (h *HeadTracker) validate(head, oldHead types.SignedHeader) (bool, error) {
signerCount := head.Signature.SignerCount()
if signerCount < h.minSignerCount {
return false, errors.New("low signer count")
}
if head.Header.Slot < oldHead.Header.Slot || (head.Header.Slot == oldHead.Header.Slot && signerCount <= oldHead.Signature.SignerCount()) {
return false, nil
}
sigOk, age, err := h.committeeChain.VerifySignedHeader(head)
if err != nil {
return false, err
}
if age < 0 {
log.Warn("Future signed head received", "age", age)
}
if age > time.Minute*2 {
log.Warn("Old signed head received", "age", age)
}
if !sigOk {
return false, errors.New("invalid header signature")
}
return true, nil
}
// PrefetchHead returns the latest known prefetch head's head info.
// This head can be used to start fetching related data hoping that it will be
// validated soon.
// Note that the prefetch head cannot be validated cryptographically so it should
// only be used as a performance optimization hint.
func (h *HeadTracker) PrefetchHead() types.HeadInfo {
h.lock.RLock()
defer h.lock.RUnlock()
return h.prefetchHead
}
// SetPrefetchHead sets the prefetch head info.
// Note that HeadTracker does not verify the prefetch head, just acts as a thread
// safe bulletin board.
func (h *HeadTracker) SetPrefetchHead(head types.HeadInfo) {
h.lock.Lock()
defer h.lock.Unlock()
if head == h.prefetchHead {
return
}
h.prefetchHead = head
h.changeCounter++
}
func (h *HeadTracker) ChangeCounter() uint64 {
h.lock.RLock()
defer h.lock.RUnlock()
return h.changeCounter
}

@ -0,0 +1,401 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package request
import (
"sync"
"github.com/ethereum/go-ethereum/log"
)
// Module represents a mechanism which is typically responsible for downloading
// and updating a passive data structure. It does not directly interact with the
// servers. It can start requests using the Requester interface, maintain its
// internal state by receiving and processing Events and update its target data
// structure based on the obtained data.
// It is the Scheduler's responsibility to feed events to the modules, call
// Process as long as there might be something to process and then generate request
// candidates using MakeRequest and start the best possible requests.
// Modules are called by Scheduler whenever a global trigger is fired. All events
// fire the trigger. Changing a target data structure also triggers a next
// processing round as it could make further actions possible either by the same
// or another Module.
type Module interface {
// Process is a non-blocking function responsible for starting requests,
// processing events and updating the target data structures(s) and the
// internal state of the module. Module state typically consists of information
// about pending requests and registered servers.
// Process is always called after an event is received or after a target data
// structure has been changed.
//
// Note: Process functions of different modules are never called concurrently;
// they are called by Scheduler in the same order of priority as they were
// registered in.
Process(Requester, []Event)
}
// Requester allows Modules to obtain the list of momentarily available servers,
// start new requests and report server failure when a response has been proven
// to be invalid in the processing phase.
// Note that all Requester functions should be safe to call from Module.Process.
type Requester interface {
CanSendTo() []Server
Send(Server, Request) ID
Fail(Server, string)
}
// Scheduler is a modular network data retrieval framework that coordinates multiple
// servers and retrieval mechanisms (modules). It implements a trigger mechanism
// that calls the Process function of registered modules whenever either the state
// of existing data structures or events coming from registered servers could
// allow new operations.
type Scheduler struct {
lock sync.Mutex
modules []Module // first has highest priority
names map[Module]string
servers map[server]struct{}
targets map[targetData]uint64
requesterLock sync.RWMutex
serverOrder []server
pending map[ServerAndID]pendingRequest
// eventLock guards access to the events list. Note that eventLock can be
// locked either while lock is locked or unlocked but lock cannot be locked
// while eventLock is locked.
eventLock sync.Mutex
events []Event
stopCh chan chan struct{}
triggerCh chan struct{} // restarts waiting sync loop
// if trigger has already been fired then send to testWaitCh blocks until
// the triggered processing round is finished
testWaitCh chan struct{}
}
type (
// Server identifies a server without allowing any direct interaction.
// Note: server interface is used by Scheduler and Tracker but not used by
// the modules that do not interact with them directly.
// In order to make module testing easier, Server interface is used in
// events and modules.
Server any
Request any
Response any
ID uint64
ServerAndID struct {
Server Server
ID ID
}
)
// targetData represents a registered target data structure that increases its
// ChangeCounter whenever it has been changed.
type targetData interface {
ChangeCounter() uint64
}
// pendingRequest keeps track of sent and not yet finalized requests and their
// sender modules.
type pendingRequest struct {
request Request
module Module
}
// NewScheduler creates a new Scheduler.
func NewScheduler() *Scheduler {
s := &Scheduler{
servers: make(map[server]struct{}),
names: make(map[Module]string),
pending: make(map[ServerAndID]pendingRequest),
targets: make(map[targetData]uint64),
stopCh: make(chan chan struct{}),
// Note: testWaitCh should not have capacity in order to ensure
// that after a trigger happens testWaitCh will block until the resulting
// processing round has been finished
triggerCh: make(chan struct{}, 1),
testWaitCh: make(chan struct{}),
}
return s
}
// RegisterTarget registers a target data structure, ensuring that any changes
// made to it trigger a new round of Module.Process calls, giving a chance to
// modules to react to the changes.
func (s *Scheduler) RegisterTarget(t targetData) {
s.lock.Lock()
defer s.lock.Unlock()
s.targets[t] = 0
}
// RegisterModule registers a module. Should be called before starting the scheduler.
// In each processing round the order of module processing depends on the order of
// registration.
func (s *Scheduler) RegisterModule(m Module, name string) {
s.lock.Lock()
defer s.lock.Unlock()
s.modules = append(s.modules, m)
s.names[m] = name
}
// RegisterServer registers a new server.
func (s *Scheduler) RegisterServer(server server) {
s.lock.Lock()
defer s.lock.Unlock()
s.addEvent(Event{Type: EvRegistered, Server: server})
server.subscribe(func(event Event) {
event.Server = server
s.addEvent(event)
})
}
// UnregisterServer removes a registered server.
func (s *Scheduler) UnregisterServer(server server) {
s.lock.Lock()
defer s.lock.Unlock()
server.unsubscribe()
s.addEvent(Event{Type: EvUnregistered, Server: server})
}
// Start starts the scheduler. It should be called after registering all modules
// and before registering any servers.
func (s *Scheduler) Start() {
go s.syncLoop()
}
// Stop stops the scheduler.
func (s *Scheduler) Stop() {
stop := make(chan struct{})
s.stopCh <- stop
<-stop
s.lock.Lock()
for server := range s.servers {
server.unsubscribe()
}
s.servers = nil
s.lock.Unlock()
}
// syncLoop is the main event loop responsible for event/data processing and
// sending new requests.
// A round of processing starts whenever the global trigger is fired. Triggers
// fired during a processing round ensure that there is going to be a next round.
func (s *Scheduler) syncLoop() {
for {
s.lock.Lock()
s.processRound()
s.lock.Unlock()
loop:
for {
select {
case stop := <-s.stopCh:
close(stop)
return
case <-s.triggerCh:
break loop
case <-s.testWaitCh:
}
}
}
}
// targetChanged returns true if a registered target data structure has been
// changed since the last call to this function.
func (s *Scheduler) targetChanged() (changed bool) {
for target, counter := range s.targets {
if newCounter := target.ChangeCounter(); newCounter != counter {
s.targets[target] = newCounter
changed = true
}
}
return
}
// processRound runs an entire processing round. It calls the Process functions
// of all modules, passing all relevant events and repeating Process calls as
// long as any changes have been made to the registered target data structures.
// Once all events have been processed and a stable state has been achieved,
// requests are generated and sent if necessary and possible.
func (s *Scheduler) processRound() {
for {
log.Trace("Processing modules")
filteredEvents := s.filterEvents()
for _, module := range s.modules {
log.Trace("Processing module", "name", s.names[module], "events", len(filteredEvents[module]))
module.Process(requester{s, module}, filteredEvents[module])
}
if !s.targetChanged() {
break
}
}
}
// Trigger starts a new processing round. If fired during processing, it ensures
// another full round of processing all modules.
func (s *Scheduler) Trigger() {
select {
case s.triggerCh <- struct{}{}:
default:
}
}
// addEvent adds an event to be processed in the next round. Note that it can be
// called regardless of the state of the lock mutex, making it safe for use in
// the server event callback.
func (s *Scheduler) addEvent(event Event) {
s.eventLock.Lock()
s.events = append(s.events, event)
s.eventLock.Unlock()
s.Trigger()
}
// filterEvent sorts each Event either as a request event or a server event,
// depending on its type. Request events are also sorted in a map based on the
// module that originally initiated the request. It also ensures that no events
// related to a server are returned before EvRegistered or after EvUnregistered.
// In case of an EvUnregistered server event it also closes all pending requests
// to the given server by adding a failed request event (EvFail), ensuring that
// all requests get finalized and thereby allowing the module logic to be safe
// and simple.
func (s *Scheduler) filterEvents() map[Module][]Event {
s.eventLock.Lock()
events := s.events
s.events = nil
s.eventLock.Unlock()
s.requesterLock.Lock()
defer s.requesterLock.Unlock()
filteredEvents := make(map[Module][]Event)
for _, event := range events {
server := event.Server.(server)
if _, ok := s.servers[server]; !ok && event.Type != EvRegistered {
continue // before EvRegister or after EvUnregister, discard
}
if event.IsRequestEvent() {
sid, _, _ := event.RequestInfo()
pending, ok := s.pending[sid]
if !ok {
continue // request already closed, ignore further events
}
if event.Type == EvResponse || event.Type == EvFail {
delete(s.pending, sid) // final event, close pending request
}
filteredEvents[pending.module] = append(filteredEvents[pending.module], event)
} else {
switch event.Type {
case EvRegistered:
s.servers[server] = struct{}{}
s.serverOrder = append(s.serverOrder, nil)
copy(s.serverOrder[1:], s.serverOrder[:len(s.serverOrder)-1])
s.serverOrder[0] = server
case EvUnregistered:
s.closePending(event.Server, filteredEvents)
delete(s.servers, server)
for i, srv := range s.serverOrder {
if srv == server {
copy(s.serverOrder[i:len(s.serverOrder)-1], s.serverOrder[i+1:])
s.serverOrder = s.serverOrder[:len(s.serverOrder)-1]
break
}
}
}
for _, module := range s.modules {
filteredEvents[module] = append(filteredEvents[module], event)
}
}
}
return filteredEvents
}
// closePending closes all pending requests to the given server and adds an EvFail
// event to properly finalize them
func (s *Scheduler) closePending(server Server, filteredEvents map[Module][]Event) {
for sid, pending := range s.pending {
if sid.Server == server {
filteredEvents[pending.module] = append(filteredEvents[pending.module], Event{
Type: EvFail,
Server: server,
Data: RequestResponse{
ID: sid.ID,
Request: pending.request,
},
})
delete(s.pending, sid)
}
}
}
// requester implements Requester. Note that while requester basically wraps
// Scheduler (with the added information of the currently processed Module), all
// functions are safe to call from Module.Process which is running while
// the Scheduler.lock mutex is held.
type requester struct {
*Scheduler
module Module
}
// CanSendTo returns the list of currently available servers. It also returns
// them in an order of least to most recently used, ensuring a round-robin usage
// of suitable servers if the module always chooses the first suitable one.
func (s requester) CanSendTo() []Server {
s.requesterLock.RLock()
defer s.requesterLock.RUnlock()
list := make([]Server, 0, len(s.serverOrder))
for _, server := range s.serverOrder {
if server.canRequestNow() {
list = append(list, server)
}
}
return list
}
// Send sends a request and adds an entry to Scheduler.pending map, ensuring that
// related request events will be delivered to the sender Module.
func (s requester) Send(srv Server, req Request) ID {
s.requesterLock.Lock()
defer s.requesterLock.Unlock()
server := srv.(server)
id := server.sendRequest(req)
sid := ServerAndID{Server: srv, ID: id}
s.pending[sid] = pendingRequest{request: req, module: s.module}
for i, ss := range s.serverOrder {
if ss == server {
copy(s.serverOrder[i:len(s.serverOrder)-1], s.serverOrder[i+1:])
s.serverOrder[len(s.serverOrder)-1] = server
return id
}
}
log.Error("Target server not found in ordered list of registered servers")
return id
}
// Fail should be called when a server delivers invalid or useless information.
// Calling Fail disables the given server for a period that is initially short
// but is exponentially growing if it happens frequently. This results in a
// somewhat fault tolerant operation that avoids hammering servers with requests
// that they cannot serve but still gives them a chance periodically.
func (s requester) Fail(srv Server, desc string) {
srv.(server).fail(desc)
}

@ -0,0 +1,122 @@
package request
import (
"reflect"
"testing"
)
func TestEventFilter(t *testing.T) {
s := NewScheduler()
module1 := &testModule{name: "module1"}
module2 := &testModule{name: "module2"}
s.RegisterModule(module1, "module1")
s.RegisterModule(module2, "module2")
s.Start()
// startup process round without events
s.testWaitCh <- struct{}{}
module1.expProcess(t, nil)
module2.expProcess(t, nil)
srv := &testServer{}
// register server; both modules should receive server event
s.RegisterServer(srv)
s.testWaitCh <- struct{}{}
module1.expProcess(t, []Event{
{Type: EvRegistered, Server: srv},
})
module2.expProcess(t, []Event{
{Type: EvRegistered, Server: srv},
})
// let module1 send a request
srv.canRequest = 1
module1.sendReq = testRequest
s.Trigger()
// in first triggered round module1 sends the request, no events yet
s.testWaitCh <- struct{}{}
module1.expProcess(t, nil)
module2.expProcess(t, nil)
// server emits EvTimeout; only module1 should receive it
srv.eventCb(Event{Type: EvTimeout, Data: RequestResponse{ID: 1, Request: testRequest}})
s.testWaitCh <- struct{}{}
module1.expProcess(t, []Event{
{Type: EvTimeout, Server: srv, Data: RequestResponse{ID: 1, Request: testRequest}},
})
module2.expProcess(t, nil)
// unregister server; both modules should receive server event
s.UnregisterServer(srv)
s.testWaitCh <- struct{}{}
module1.expProcess(t, []Event{
// module1 should also receive EvFail on its pending request
{Type: EvFail, Server: srv, Data: RequestResponse{ID: 1, Request: testRequest}},
{Type: EvUnregistered, Server: srv},
})
module2.expProcess(t, []Event{
{Type: EvUnregistered, Server: srv},
})
// response after server unregistered; should be discarded
srv.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 1, Request: testRequest, Response: testResponse}})
s.testWaitCh <- struct{}{}
module1.expProcess(t, nil)
module2.expProcess(t, nil)
// no more process rounds expected; shut down
s.testWaitCh <- struct{}{}
module1.expNoMoreProcess(t)
module2.expNoMoreProcess(t)
s.Stop()
}
type testServer struct {
eventCb func(Event)
lastID ID
canRequest int
}
func (s *testServer) subscribe(eventCb func(Event)) {
s.eventCb = eventCb
}
func (s *testServer) canRequestNow() bool {
return s.canRequest > 0
}
func (s *testServer) sendRequest(req Request) ID {
s.canRequest--
s.lastID++
return s.lastID
}
func (s *testServer) fail(string) {}
func (s *testServer) unsubscribe() {}
type testModule struct {
name string
processed [][]Event
sendReq Request
}
func (m *testModule) Process(requester Requester, events []Event) {
m.processed = append(m.processed, events)
if m.sendReq != nil {
if cs := requester.CanSendTo(); len(cs) > 0 {
requester.Send(cs[0], m.sendReq)
}
}
}
func (m *testModule) expProcess(t *testing.T, expEvents []Event) {
if len(m.processed) == 0 {
t.Errorf("Missing call to %s.Process", m.name)
return
}
events := m.processed[0]
m.processed = m.processed[1:]
if !reflect.DeepEqual(events, expEvents) {
t.Errorf("Call to %s.Process with wrong events (expected %v, got %v)", m.name, expEvents, events)
}
}
func (m *testModule) expNoMoreProcess(t *testing.T) {
for len(m.processed) > 0 {
t.Errorf("Unexpected call to %s.Process with events %v", m.name, m.processed[0])
m.processed = m.processed[1:]
}
}

@ -0,0 +1,439 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package request
import (
"math"
"sync"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/log"
)
var (
// request events
EvResponse = &EventType{Name: "response", requestEvent: true} // data: RequestResponse; sent by requestServer
EvFail = &EventType{Name: "fail", requestEvent: true} // data: RequestResponse; sent by requestServer
EvTimeout = &EventType{Name: "timeout", requestEvent: true} // data: RequestResponse; sent by serverWithTimeout
// server events
EvRegistered = &EventType{Name: "registered"} // data: nil; sent by Scheduler
EvUnregistered = &EventType{Name: "unregistered"} // data: nil; sent by Scheduler
EvCanRequestAgain = &EventType{Name: "canRequestAgain"} // data: nil; sent by serverWithLimits
)
const (
softRequestTimeout = time.Second // allow resending request to a different server but do not cancel yet
hardRequestTimeout = time.Second * 10 // cancel request
)
const (
// serverWithLimits parameters
parallelAdjustUp = 0.1 // adjust parallelLimit up in case of success under full load
parallelAdjustDown = 1 // adjust parallelLimit down in case of timeout/failure
minParallelLimit = 1 // parallelLimit lower bound
defaultParallelLimit = 3 // parallelLimit initial value
minFailureDelay = time.Millisecond * 100 // minimum disable time in case of request failure
maxFailureDelay = time.Minute // maximum disable time in case of request failure
maxServerEventBuffer = 5 // server event allowance buffer limit
maxServerEventRate = time.Second // server event allowance buffer recharge rate
)
// requestServer can send requests in a non-blocking way and feed back events
// through the event callback. After each request it should send back either
// EvResponse or EvFail. Additionally, it may also send application-defined
// events that the Modules can interpret.
type requestServer interface {
Subscribe(eventCallback func(Event))
SendRequest(ID, Request)
Unsubscribe()
}
// server is implemented by a requestServer wrapped into serverWithTimeout and
// serverWithLimits and is used by Scheduler.
// In addition to requestServer functionality, server can also handle timeouts,
// limit the number of parallel in-flight requests and temporarily disable
// new requests based on timeouts and response failures.
type server interface {
subscribe(eventCallback func(Event))
canRequestNow() bool
sendRequest(Request) ID
fail(string)
unsubscribe()
}
// NewServer wraps a requestServer and returns a server
func NewServer(rs requestServer, clock mclock.Clock) server {
s := &serverWithLimits{}
s.parent = rs
s.serverWithTimeout.init(clock)
s.init()
return s
}
// EventType identifies an event type, either related to a request or the server
// in general. Server events can also be externally defined.
type EventType struct {
Name string
requestEvent bool // all request events are pre-defined in request package
}
// Event describes an event where the type of Data depends on Type.
// Server field is not required when sent through the event callback; it is filled
// out when processed by the Scheduler. Note that the Scheduler can also create
// and send events (EvRegistered, EvUnregistered) directly.
type Event struct {
Type *EventType
Server Server // filled by Scheduler
Data any
}
// IsRequestEvent returns true if the event is a request event
func (e *Event) IsRequestEvent() bool {
return e.Type.requestEvent
}
// RequestInfo assumes that the event is a request event and returns its contents
// in a convenient form.
func (e *Event) RequestInfo() (ServerAndID, Request, Response) {
data := e.Data.(RequestResponse)
return ServerAndID{Server: e.Server, ID: data.ID}, data.Request, data.Response
}
// RequestResponse is the Data type of request events.
type RequestResponse struct {
ID ID
Request Request
Response Response
}
// serverWithTimeout wraps a requestServer and introduces timeouts.
// The request's lifecycle is concluded if EvResponse or EvFail emitted by the
// parent requestServer. If this does not happen until softRequestTimeout then
// EvTimeout is emitted, after which the final EvResponse or EvFail is still
// guaranteed to follow.
// If the parent fails to send this final event for hardRequestTimeout then
// serverWithTimeout emits EvFail and discards any further events from the
// parent related to the given request.
type serverWithTimeout struct {
parent requestServer
lock sync.Mutex
clock mclock.Clock
childEventCb func(event Event)
timeouts map[ID]mclock.Timer
lastID ID
}
// init initializes serverWithTimeout
func (s *serverWithTimeout) init(clock mclock.Clock) {
s.clock = clock
s.timeouts = make(map[ID]mclock.Timer)
}
// subscribe subscribes to events which include parent (requestServer) events
// plus EvTimeout.
func (s *serverWithTimeout) subscribe(eventCallback func(event Event)) {
s.lock.Lock()
defer s.lock.Unlock()
s.childEventCb = eventCallback
s.parent.Subscribe(s.eventCallback)
}
// sendRequest generated a new request ID, emits EvRequest, sets up the timeout
// timer, then sends the request through the parent (requestServer).
func (s *serverWithTimeout) sendRequest(request Request) (reqId ID) {
s.lock.Lock()
s.lastID++
id := s.lastID
s.startTimeout(RequestResponse{ID: id, Request: request})
s.lock.Unlock()
s.parent.SendRequest(id, request)
return id
}
// eventCallback is called by parent (requestServer) event subscription.
func (s *serverWithTimeout) eventCallback(event Event) {
s.lock.Lock()
defer s.lock.Unlock()
switch event.Type {
case EvResponse, EvFail:
id := event.Data.(RequestResponse).ID
if timer, ok := s.timeouts[id]; ok {
// Note: if stopping the timer is unsuccessful then the resulting AfterFunc
// call will just do nothing
timer.Stop()
delete(s.timeouts, id)
s.childEventCb(event)
}
default:
s.childEventCb(event)
}
}
// startTimeout starts a timeout timer for the given request.
func (s *serverWithTimeout) startTimeout(reqData RequestResponse) {
id := reqData.ID
s.timeouts[id] = s.clock.AfterFunc(softRequestTimeout, func() {
s.lock.Lock()
if _, ok := s.timeouts[id]; !ok {
s.lock.Unlock()
return
}
s.timeouts[id] = s.clock.AfterFunc(hardRequestTimeout-softRequestTimeout, func() {
s.lock.Lock()
if _, ok := s.timeouts[id]; !ok {
s.lock.Unlock()
return
}
delete(s.timeouts, id)
childEventCb := s.childEventCb
s.lock.Unlock()
childEventCb(Event{Type: EvFail, Data: reqData})
})
childEventCb := s.childEventCb
s.lock.Unlock()
childEventCb(Event{Type: EvTimeout, Data: reqData})
})
}
// stop stops all goroutines associated with the server.
func (s *serverWithTimeout) unsubscribe() {
s.lock.Lock()
defer s.lock.Unlock()
for _, timer := range s.timeouts {
if timer != nil {
timer.Stop()
}
}
s.childEventCb = nil
s.parent.Unsubscribe()
}
// serverWithLimits wraps serverWithTimeout and implements server. It limits the
// number of parallel in-flight requests and prevents sending new requests when a
// pending one has already timed out. Server events are also rate limited.
// It also implements a failure delay mechanism that adds an exponentially growing
// delay each time a request fails (wrong answer or hard timeout). This makes the
// syncing mechanism less brittle as temporary failures of the server might happen
// sometimes, but still avoids hammering a non-functional server with requests.
type serverWithLimits struct {
serverWithTimeout
lock sync.Mutex
childEventCb func(event Event)
softTimeouts map[ID]struct{}
pendingCount, timeoutCount int
parallelLimit float32
sendEvent bool
delayTimer mclock.Timer
delayCounter int
failureDelayEnd mclock.AbsTime
failureDelay float64
serverEventBuffer int
eventBufferUpdated mclock.AbsTime
}
// init initializes serverWithLimits
func (s *serverWithLimits) init() {
s.softTimeouts = make(map[ID]struct{})
s.parallelLimit = defaultParallelLimit
s.serverEventBuffer = maxServerEventBuffer
}
// subscribe subscribes to events which include parent (serverWithTimeout) events
// plus EvCanRequstAgain.
func (s *serverWithLimits) subscribe(eventCallback func(event Event)) {
s.lock.Lock()
defer s.lock.Unlock()
s.childEventCb = eventCallback
s.serverWithTimeout.subscribe(s.eventCallback)
}
// eventCallback is called by parent (serverWithTimeout) event subscription.
func (s *serverWithLimits) eventCallback(event Event) {
s.lock.Lock()
var sendCanRequestAgain bool
passEvent := true
switch event.Type {
case EvTimeout:
id := event.Data.(RequestResponse).ID
s.softTimeouts[id] = struct{}{}
s.timeoutCount++
s.parallelLimit -= parallelAdjustDown
if s.parallelLimit < minParallelLimit {
s.parallelLimit = minParallelLimit
}
log.Debug("Server timeout", "count", s.timeoutCount, "parallelLimit", s.parallelLimit)
case EvResponse, EvFail:
id := event.Data.(RequestResponse).ID
if _, ok := s.softTimeouts[id]; ok {
delete(s.softTimeouts, id)
s.timeoutCount--
log.Debug("Server timeout finalized", "count", s.timeoutCount, "parallelLimit", s.parallelLimit)
}
if event.Type == EvResponse && s.pendingCount >= int(s.parallelLimit) {
s.parallelLimit += parallelAdjustUp
}
s.pendingCount--
if s.canRequest() {
sendCanRequestAgain = s.sendEvent
s.sendEvent = false
}
if event.Type == EvFail {
s.failLocked("failed request")
}
default:
// server event; check rate limit
if s.serverEventBuffer < maxServerEventBuffer {
now := s.clock.Now()
sinceUpdate := time.Duration(now - s.eventBufferUpdated)
if sinceUpdate >= maxServerEventRate*time.Duration(maxServerEventBuffer-s.serverEventBuffer) {
s.serverEventBuffer = maxServerEventBuffer
s.eventBufferUpdated = now
} else {
addBuffer := int(sinceUpdate / maxServerEventRate)
s.serverEventBuffer += addBuffer
s.eventBufferUpdated += mclock.AbsTime(maxServerEventRate * time.Duration(addBuffer))
}
}
if s.serverEventBuffer > 0 {
s.serverEventBuffer--
} else {
passEvent = false
}
}
childEventCb := s.childEventCb
s.lock.Unlock()
if passEvent {
childEventCb(event)
}
if sendCanRequestAgain {
childEventCb(Event{Type: EvCanRequestAgain})
}
}
// sendRequest sends a request through the parent (serverWithTimeout).
func (s *serverWithLimits) sendRequest(request Request) (reqId ID) {
s.lock.Lock()
s.pendingCount++
s.lock.Unlock()
return s.serverWithTimeout.sendRequest(request)
}
// stop stops all goroutines associated with the server.
func (s *serverWithLimits) unsubscribe() {
s.lock.Lock()
defer s.lock.Unlock()
if s.delayTimer != nil {
s.delayTimer.Stop()
s.delayTimer = nil
}
s.childEventCb = nil
s.serverWithTimeout.unsubscribe()
}
// canRequest checks whether a new request can be started.
func (s *serverWithLimits) canRequest() bool {
if s.delayTimer != nil || s.pendingCount >= int(s.parallelLimit) || s.timeoutCount > 0 {
return false
}
if s.parallelLimit < minParallelLimit {
s.parallelLimit = minParallelLimit
}
return true
}
// canRequestNow checks whether a new request can be started, according to the
// current in-flight request count and parallelLimit, and also the failure delay
// timer.
// If it returns false then it is guaranteed that an EvCanRequestAgain will be
// sent whenever the server becomes available for requesting again.
func (s *serverWithLimits) canRequestNow() bool {
var sendCanRequestAgain bool
s.lock.Lock()
canRequest := s.canRequest()
if canRequest {
sendCanRequestAgain = s.sendEvent
s.sendEvent = false
}
childEventCb := s.childEventCb
s.lock.Unlock()
if sendCanRequestAgain {
childEventCb(Event{Type: EvCanRequestAgain})
}
return canRequest
}
// delay sets the delay timer to the given duration, disabling new requests for
// the given period.
func (s *serverWithLimits) delay(delay time.Duration) {
if s.delayTimer != nil {
// Note: if stopping the timer is unsuccessful then the resulting AfterFunc
// call will just do nothing
s.delayTimer.Stop()
s.delayTimer = nil
}
s.delayCounter++
delayCounter := s.delayCounter
log.Debug("Server delay started", "length", delay)
s.delayTimer = s.clock.AfterFunc(delay, func() {
log.Debug("Server delay ended", "length", delay)
var sendCanRequestAgain bool
s.lock.Lock()
if s.delayTimer != nil && s.delayCounter == delayCounter { // do nothing if there is a new timer now
s.delayTimer = nil
if s.canRequest() {
sendCanRequestAgain = s.sendEvent
s.sendEvent = false
}
}
childEventCb := s.childEventCb
s.lock.Unlock()
if sendCanRequestAgain {
childEventCb(Event{Type: EvCanRequestAgain})
}
})
}
// fail reports that a response from the server was found invalid by the processing
// Module, disabling new requests for a dynamically adjused time period.
func (s *serverWithLimits) fail(desc string) {
s.lock.Lock()
defer s.lock.Unlock()
s.failLocked(desc)
}
// failLocked calculates the dynamic failure delay and applies it.
func (s *serverWithLimits) failLocked(desc string) {
log.Debug("Server error", "description", desc)
s.failureDelay *= 2
now := s.clock.Now()
if now > s.failureDelayEnd {
s.failureDelay *= math.Pow(2, -float64(now-s.failureDelayEnd)/float64(maxFailureDelay))
}
if s.failureDelay < float64(minFailureDelay) {
s.failureDelay = float64(minFailureDelay)
}
s.failureDelayEnd = now + mclock.AbsTime(s.failureDelay)
s.delay(time.Duration(s.failureDelay))
}

@ -0,0 +1,158 @@
package request
import (
"testing"
"github.com/ethereum/go-ethereum/common/mclock"
)
const (
testRequest = "Life, the Universe, and Everything"
testResponse = 42
)
var testEventType = &EventType{Name: "testEvent"}
func TestServerEvents(t *testing.T) {
rs := &testRequestServer{}
clock := &mclock.Simulated{}
srv := NewServer(rs, clock)
var lastEventType *EventType
srv.subscribe(func(event Event) { lastEventType = event.Type })
evTypeName := func(evType *EventType) string {
if evType == nil {
return "none"
}
return evType.Name
}
expEvent := func(expType *EventType) {
if lastEventType != expType {
t.Errorf("Wrong event type (expected %s, got %s)", evTypeName(expType), evTypeName(lastEventType))
}
lastEventType = nil
}
// user events should simply be passed through
rs.eventCb(Event{Type: testEventType})
expEvent(testEventType)
// send request, soft timeout, then valid response
srv.sendRequest(testRequest)
clock.WaitForTimers(1)
clock.Run(softRequestTimeout)
expEvent(EvTimeout)
rs.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 1, Request: testRequest, Response: testResponse}})
expEvent(EvResponse)
// send request, hard timeout (response after hard timeout should be ignored)
srv.sendRequest(testRequest)
clock.WaitForTimers(1)
clock.Run(softRequestTimeout)
expEvent(EvTimeout)
clock.WaitForTimers(1)
clock.Run(hardRequestTimeout)
expEvent(EvFail)
rs.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 1, Request: testRequest, Response: testResponse}})
expEvent(nil)
}
func TestServerParallel(t *testing.T) {
rs := &testRequestServer{}
srv := NewServer(rs, &mclock.Simulated{})
srv.subscribe(func(event Event) {})
expSend := func(expSent int) {
var sent int
for sent <= expSent {
if !srv.canRequestNow() {
break
}
sent++
srv.sendRequest(testRequest)
}
if sent != expSent {
t.Errorf("Wrong number of parallel requests accepted (expected %d, got %d)", expSent, sent)
}
}
// max out parallel allowance
expSend(defaultParallelLimit)
// 1 answered, should accept 1 more
rs.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 1, Request: testRequest, Response: testResponse}})
expSend(1)
// 2 answered, should accept 2 more
rs.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 2, Request: testRequest, Response: testResponse}})
rs.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 3, Request: testRequest, Response: testResponse}})
expSend(2)
// failed request, should decrease allowance and not accept more
rs.eventCb(Event{Type: EvFail, Data: RequestResponse{ID: 4, Request: testRequest}})
expSend(0)
srv.unsubscribe()
}
func TestServerFail(t *testing.T) {
rs := &testRequestServer{}
clock := &mclock.Simulated{}
srv := NewServer(rs, clock)
srv.subscribe(func(event Event) {})
expCanRequest := func(expCanRequest bool) {
if canRequest := srv.canRequestNow(); canRequest != expCanRequest {
t.Errorf("Wrong result for canRequestNow (expected %v, got %v)", expCanRequest, canRequest)
}
}
// timed out request
expCanRequest(true)
srv.sendRequest(testRequest)
clock.WaitForTimers(1)
expCanRequest(true)
clock.Run(softRequestTimeout)
expCanRequest(false) // cannot request when there is a timed out request
rs.eventCb(Event{Type: EvResponse, Data: RequestResponse{ID: 1, Request: testRequest, Response: testResponse}})
expCanRequest(true)
// explicit server.Fail
srv.fail("")
clock.WaitForTimers(1)
expCanRequest(false) // cannot request for a while after a failure
clock.Run(minFailureDelay)
expCanRequest(true)
// request returned with EvFail
srv.sendRequest(testRequest)
rs.eventCb(Event{Type: EvFail, Data: RequestResponse{ID: 2, Request: testRequest}})
clock.WaitForTimers(1)
expCanRequest(false) // EvFail should also start failure delay
clock.Run(minFailureDelay)
expCanRequest(false) // second failure delay is longer, should still be disabled
clock.Run(minFailureDelay)
expCanRequest(true)
srv.unsubscribe()
}
func TestServerEventRateLimit(t *testing.T) {
rs := &testRequestServer{}
clock := &mclock.Simulated{}
srv := NewServer(rs, clock)
var eventCount int
srv.subscribe(func(event Event) {
if !event.IsRequestEvent() {
eventCount++
}
})
expEvents := func(send, expAllowed int) {
eventCount = 0
for sent := 0; sent < send; sent++ {
rs.eventCb(Event{Type: testEventType})
}
if eventCount != expAllowed {
t.Errorf("Wrong number of server events passing rate limitation (sent %d, expected %d, got %d)", send, expAllowed, eventCount)
}
}
expEvents(maxServerEventBuffer+5, maxServerEventBuffer)
clock.Run(maxServerEventRate)
expEvents(5, 1)
clock.Run(maxServerEventRate * maxServerEventBuffer * 2)
expEvents(maxServerEventBuffer+5, maxServerEventBuffer)
}
type testRequestServer struct {
eventCb func(Event)
}
func (rs *testRequestServer) Subscribe(eventCb func(Event)) { rs.eventCb = eventCb }
func (rs *testRequestServer) SendRequest(ID, Request) {}
func (rs *testRequestServer) Unsubscribe() {}

@ -0,0 +1,176 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/types"
)
type headTracker interface {
ValidateHead(head types.SignedHeader) (bool, error)
ValidateFinality(head types.FinalityUpdate) (bool, error)
SetPrefetchHead(head types.HeadInfo)
}
// HeadSync implements request.Module; it updates the validated and prefetch
// heads of HeadTracker based on the EvHead and EvSignedHead events coming from
// registered servers.
// It can also postpone the validation of the latest announced signed head
// until the committee chain is synced up to at least the required period.
type HeadSync struct {
headTracker headTracker
chain committeeChain
nextSyncPeriod uint64
chainInit bool
unvalidatedHeads map[request.Server]types.SignedHeader
unvalidatedFinality map[request.Server]types.FinalityUpdate
serverHeads map[request.Server]types.HeadInfo
headServerCount map[types.HeadInfo]headServerCount
headCounter uint64
prefetchHead types.HeadInfo
}
// headServerCount is associated with most recently seen head infos; it counts
// the number of servers currently having the given head info as their announced
// head and a counter signaling how recent that head is.
// This data is used for selecting the prefetch head.
type headServerCount struct {
serverCount int
headCounter uint64
}
// NewHeadSync creates a new HeadSync.
func NewHeadSync(headTracker headTracker, chain committeeChain) *HeadSync {
s := &HeadSync{
headTracker: headTracker,
chain: chain,
unvalidatedHeads: make(map[request.Server]types.SignedHeader),
unvalidatedFinality: make(map[request.Server]types.FinalityUpdate),
serverHeads: make(map[request.Server]types.HeadInfo),
headServerCount: make(map[types.HeadInfo]headServerCount),
}
return s
}
// Process implements request.Module.
func (s *HeadSync) Process(requester request.Requester, events []request.Event) {
for _, event := range events {
switch event.Type {
case EvNewHead:
s.setServerHead(event.Server, event.Data.(types.HeadInfo))
case EvNewSignedHead:
s.newSignedHead(event.Server, event.Data.(types.SignedHeader))
case EvNewFinalityUpdate:
s.newFinalityUpdate(event.Server, event.Data.(types.FinalityUpdate))
case request.EvUnregistered:
s.setServerHead(event.Server, types.HeadInfo{})
delete(s.serverHeads, event.Server)
delete(s.unvalidatedHeads, event.Server)
}
}
nextPeriod, chainInit := s.chain.NextSyncPeriod()
if nextPeriod != s.nextSyncPeriod || chainInit != s.chainInit {
s.nextSyncPeriod, s.chainInit = nextPeriod, chainInit
s.processUnvalidated()
}
}
// newSignedHead handles received signed head; either validates it if the chain
// is properly synced or stores it for further validation.
func (s *HeadSync) newSignedHead(server request.Server, signedHead types.SignedHeader) {
if !s.chainInit || types.SyncPeriod(signedHead.SignatureSlot) > s.nextSyncPeriod {
s.unvalidatedHeads[server] = signedHead
return
}
s.headTracker.ValidateHead(signedHead)
}
// newSignedHead handles received signed head; either validates it if the chain
// is properly synced or stores it for further validation.
func (s *HeadSync) newFinalityUpdate(server request.Server, finalityUpdate types.FinalityUpdate) {
if !s.chainInit || types.SyncPeriod(finalityUpdate.SignatureSlot) > s.nextSyncPeriod {
s.unvalidatedFinality[server] = finalityUpdate
return
}
s.headTracker.ValidateFinality(finalityUpdate)
}
// processUnvalidatedHeads iterates the list of unvalidated heads and validates
// those which can be validated.
func (s *HeadSync) processUnvalidated() {
if !s.chainInit {
return
}
for server, signedHead := range s.unvalidatedHeads {
if types.SyncPeriod(signedHead.SignatureSlot) <= s.nextSyncPeriod {
s.headTracker.ValidateHead(signedHead)
delete(s.unvalidatedHeads, server)
}
}
for server, finalityUpdate := range s.unvalidatedFinality {
if types.SyncPeriod(finalityUpdate.SignatureSlot) <= s.nextSyncPeriod {
s.headTracker.ValidateFinality(finalityUpdate)
delete(s.unvalidatedFinality, server)
}
}
}
// setServerHead processes non-validated server head announcements and updates
// the prefetch head if necessary.
func (s *HeadSync) setServerHead(server request.Server, head types.HeadInfo) bool {
if oldHead, ok := s.serverHeads[server]; ok {
if head == oldHead {
return false
}
h := s.headServerCount[oldHead]
if h.serverCount--; h.serverCount > 0 {
s.headServerCount[oldHead] = h
} else {
delete(s.headServerCount, oldHead)
}
}
if head != (types.HeadInfo{}) {
h, ok := s.headServerCount[head]
if !ok {
s.headCounter++
h.headCounter = s.headCounter
}
h.serverCount++
s.headServerCount[head] = h
s.serverHeads[server] = head
} else {
delete(s.serverHeads, server)
}
var (
bestHead types.HeadInfo
bestHeadInfo headServerCount
)
for head, headServerCount := range s.headServerCount {
if headServerCount.serverCount > bestHeadInfo.serverCount ||
(headServerCount.serverCount == bestHeadInfo.serverCount && headServerCount.headCounter > bestHeadInfo.headCounter) {
bestHead, bestHeadInfo = head, headServerCount
}
}
if bestHead == s.prefetchHead {
return false
}
s.prefetchHead = bestHead
s.headTracker.SetPrefetchHead(bestHead)
return true
}

@ -0,0 +1,151 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"testing"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
)
var (
testServer1 = "testServer1"
testServer2 = "testServer2"
testServer3 = "testServer3"
testServer4 = "testServer4"
testHead0 = types.HeadInfo{}
testHead1 = types.HeadInfo{Slot: 123, BlockRoot: common.Hash{1}}
testHead2 = types.HeadInfo{Slot: 124, BlockRoot: common.Hash{2}}
testHead3 = types.HeadInfo{Slot: 124, BlockRoot: common.Hash{3}}
testHead4 = types.HeadInfo{Slot: 125, BlockRoot: common.Hash{4}}
testSHead1 = types.SignedHeader{SignatureSlot: 0x0124, Header: types.Header{Slot: 0x0123, StateRoot: common.Hash{1}}}
testSHead2 = types.SignedHeader{SignatureSlot: 0x2010, Header: types.Header{Slot: 0x200e, StateRoot: common.Hash{2}}}
// testSHead3 is at the end of period 1 but signed in period 2
testSHead3 = types.SignedHeader{SignatureSlot: 0x4000, Header: types.Header{Slot: 0x3fff, StateRoot: common.Hash{3}}}
testSHead4 = types.SignedHeader{SignatureSlot: 0x6444, Header: types.Header{Slot: 0x6443, StateRoot: common.Hash{4}}}
)
func TestValidatedHead(t *testing.T) {
chain := &TestCommitteeChain{}
ht := &TestHeadTracker{}
headSync := NewHeadSync(ht, chain)
ts := NewTestScheduler(t, headSync)
ht.ExpValidated(t, 0, nil)
ts.AddServer(testServer1, 1)
ts.ServerEvent(EvNewSignedHead, testServer1, testSHead1)
ts.Run(1)
// announced head should be queued because of uninitialized chain
ht.ExpValidated(t, 1, nil)
chain.SetNextSyncPeriod(0) // initialize chain
ts.Run(2)
// expect previously queued head to be validated
ht.ExpValidated(t, 2, []types.SignedHeader{testSHead1})
chain.SetNextSyncPeriod(1)
ts.ServerEvent(EvNewSignedHead, testServer1, testSHead2)
ts.AddServer(testServer2, 1)
ts.ServerEvent(EvNewSignedHead, testServer2, testSHead2)
ts.Run(3)
// expect both head announcements to be validated instantly
ht.ExpValidated(t, 3, []types.SignedHeader{testSHead2, testSHead2})
ts.ServerEvent(EvNewSignedHead, testServer1, testSHead3)
ts.AddServer(testServer3, 1)
ts.ServerEvent(EvNewSignedHead, testServer3, testSHead4)
ts.Run(4)
// future period annonced heads should be queued
ht.ExpValidated(t, 4, nil)
chain.SetNextSyncPeriod(2)
ts.Run(5)
// testSHead3 can be validated now but not testSHead4
ht.ExpValidated(t, 5, []types.SignedHeader{testSHead3})
// server 3 disconnected without proving period 3, its announced head should be dropped
ts.RemoveServer(testServer3)
ts.Run(6)
ht.ExpValidated(t, 6, nil)
chain.SetNextSyncPeriod(3)
ts.Run(7)
// testSHead4 could be validated now but it's not queued by any registered server
ht.ExpValidated(t, 7, nil)
ts.ServerEvent(EvNewSignedHead, testServer2, testSHead4)
ts.Run(8)
// now testSHead4 should be validated
ht.ExpValidated(t, 8, []types.SignedHeader{testSHead4})
}
func TestPrefetchHead(t *testing.T) {
chain := &TestCommitteeChain{}
ht := &TestHeadTracker{}
headSync := NewHeadSync(ht, chain)
ts := NewTestScheduler(t, headSync)
ht.ExpPrefetch(t, 0, testHead0) // no servers registered
ts.AddServer(testServer1, 1)
ts.ServerEvent(EvNewHead, testServer1, testHead1)
ts.Run(1)
ht.ExpPrefetch(t, 1, testHead1) // s1: h1
ts.AddServer(testServer2, 1)
ts.ServerEvent(EvNewHead, testServer2, testHead2)
ts.Run(2)
ht.ExpPrefetch(t, 2, testHead2) // s1: h1, s2: h2
ts.ServerEvent(EvNewHead, testServer1, testHead2)
ts.Run(3)
ht.ExpPrefetch(t, 3, testHead2) // s1: h2, s2: h2
ts.AddServer(testServer3, 1)
ts.ServerEvent(EvNewHead, testServer3, testHead3)
ts.Run(4)
ht.ExpPrefetch(t, 4, testHead2) // s1: h2, s2: h2, s3: h3
ts.AddServer(testServer4, 1)
ts.ServerEvent(EvNewHead, testServer4, testHead4)
ts.Run(5)
ht.ExpPrefetch(t, 5, testHead2) // s1: h2, s2: h2, s3: h3, s4: h4
ts.ServerEvent(EvNewHead, testServer2, testHead3)
ts.Run(6)
ht.ExpPrefetch(t, 6, testHead3) // s1: h2, s2: h3, s3: h3, s4: h4
ts.RemoveServer(testServer3)
ts.Run(7)
ht.ExpPrefetch(t, 7, testHead4) // s1: h2, s2: h3, s4: h4
ts.RemoveServer(testServer1)
ts.Run(8)
ht.ExpPrefetch(t, 8, testHead4) // s2: h3, s4: h4
ts.RemoveServer(testServer4)
ts.Run(9)
ht.ExpPrefetch(t, 9, testHead3) // s2: h3
ts.RemoveServer(testServer2)
ts.Run(10)
ht.ExpPrefetch(t, 10, testHead0) // no servers registered
}

@ -0,0 +1,254 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"reflect"
"testing"
"github.com/ethereum/go-ethereum/beacon/light"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/types"
)
type requestWithID struct {
sid request.ServerAndID
request request.Request
}
type TestScheduler struct {
t *testing.T
module request.Module
events []request.Event
servers []request.Server
allowance map[request.Server]int
sent map[int][]requestWithID
testIndex int
expFail map[request.Server]int // expected Server.Fail calls during next Run
lastId request.ID
}
func NewTestScheduler(t *testing.T, module request.Module) *TestScheduler {
return &TestScheduler{
t: t,
module: module,
allowance: make(map[request.Server]int),
expFail: make(map[request.Server]int),
sent: make(map[int][]requestWithID),
}
}
func (ts *TestScheduler) Run(testIndex int, exp ...any) {
expReqs := make([]requestWithID, len(exp)/2)
id := ts.lastId
for i := range expReqs {
id++
expReqs[i] = requestWithID{
sid: request.ServerAndID{Server: exp[i*2].(request.Server), ID: id},
request: exp[i*2+1].(request.Request),
}
}
if len(expReqs) == 0 {
expReqs = nil
}
ts.testIndex = testIndex
ts.module.Process(ts, ts.events)
ts.events = nil
for server, count := range ts.expFail {
delete(ts.expFail, server)
if count == 0 {
continue
}
ts.t.Errorf("Missing %d Server.Fail(s) from server %s in test case #%d", count, server.(string), testIndex)
}
if !reflect.DeepEqual(ts.sent[testIndex], expReqs) {
ts.t.Errorf("Wrong sent requests in test case #%d (expected %v, got %v)", testIndex, expReqs, ts.sent[testIndex])
}
}
func (ts *TestScheduler) CanSendTo() (cs []request.Server) {
for _, server := range ts.servers {
if ts.allowance[server] > 0 {
cs = append(cs, server)
}
}
return
}
func (ts *TestScheduler) Send(server request.Server, req request.Request) request.ID {
ts.lastId++
ts.sent[ts.testIndex] = append(ts.sent[ts.testIndex], requestWithID{
sid: request.ServerAndID{Server: server, ID: ts.lastId},
request: req,
})
ts.allowance[server]--
return ts.lastId
}
func (ts *TestScheduler) Fail(server request.Server, desc string) {
if ts.expFail[server] == 0 {
ts.t.Errorf("Unexpected Fail from server %s in test case #%d: %s", server.(string), ts.testIndex, desc)
return
}
ts.expFail[server]--
}
func (ts *TestScheduler) Request(testIndex, reqIndex int) requestWithID {
if len(ts.sent[testIndex]) < reqIndex {
ts.t.Errorf("Missing request from test case %d index %d", testIndex, reqIndex)
return requestWithID{}
}
return ts.sent[testIndex][reqIndex-1]
}
func (ts *TestScheduler) ServerEvent(evType *request.EventType, server request.Server, data any) {
ts.events = append(ts.events, request.Event{
Type: evType,
Server: server,
Data: data,
})
}
func (ts *TestScheduler) RequestEvent(evType *request.EventType, req requestWithID, resp request.Response) {
if req.request == nil {
return
}
ts.events = append(ts.events, request.Event{
Type: evType,
Server: req.sid.Server,
Data: request.RequestResponse{
ID: req.sid.ID,
Request: req.request,
Response: resp,
},
})
}
func (ts *TestScheduler) AddServer(server request.Server, allowance int) {
ts.servers = append(ts.servers, server)
ts.allowance[server] = allowance
ts.ServerEvent(request.EvRegistered, server, nil)
}
func (ts *TestScheduler) RemoveServer(server request.Server) {
ts.servers = append(ts.servers, server)
for i, s := range ts.servers {
if s == server {
copy(ts.servers[i:len(ts.servers)-1], ts.servers[i+1:])
ts.servers = ts.servers[:len(ts.servers)-1]
break
}
}
delete(ts.allowance, server)
ts.ServerEvent(request.EvUnregistered, server, nil)
}
func (ts *TestScheduler) AddAllowance(server request.Server, allowance int) {
ts.allowance[server] += allowance
}
func (ts *TestScheduler) ExpFail(server request.Server) {
ts.expFail[server]++
}
type TestCommitteeChain struct {
fsp, nsp uint64
init bool
}
func (t *TestCommitteeChain) CheckpointInit(bootstrap types.BootstrapData) error {
t.fsp, t.nsp, t.init = bootstrap.Header.SyncPeriod(), bootstrap.Header.SyncPeriod()+2, true
return nil
}
func (t *TestCommitteeChain) InsertUpdate(update *types.LightClientUpdate, nextCommittee *types.SerializedSyncCommittee) error {
period := update.AttestedHeader.Header.SyncPeriod()
if period < t.fsp || period > t.nsp || !t.init {
return light.ErrInvalidPeriod
}
if period == t.nsp {
t.nsp++
}
return nil
}
func (t *TestCommitteeChain) NextSyncPeriod() (uint64, bool) {
return t.nsp, t.init
}
func (tc *TestCommitteeChain) ExpInit(t *testing.T, ExpInit bool) {
if tc.init != ExpInit {
t.Errorf("Incorrect init flag (expected %v, got %v)", ExpInit, tc.init)
}
}
func (t *TestCommitteeChain) SetNextSyncPeriod(nsp uint64) {
t.init, t.nsp = true, nsp
}
func (tc *TestCommitteeChain) ExpNextSyncPeriod(t *testing.T, expNsp uint64) {
tc.ExpInit(t, true)
if tc.nsp != expNsp {
t.Errorf("Incorrect NextSyncPeriod (expected %d, got %d)", expNsp, tc.nsp)
}
}
type TestHeadTracker struct {
phead types.HeadInfo
validated []types.SignedHeader
}
func (ht *TestHeadTracker) ValidateHead(head types.SignedHeader) (bool, error) {
ht.validated = append(ht.validated, head)
return true, nil
}
// TODO add test case for finality
func (ht *TestHeadTracker) ValidateFinality(head types.FinalityUpdate) (bool, error) {
return true, nil
}
func (ht *TestHeadTracker) ExpValidated(t *testing.T, tci int, expHeads []types.SignedHeader) {
for i, expHead := range expHeads {
if i >= len(ht.validated) {
t.Errorf("Missing validated head in test case #%d index #%d (expected {slot %d blockRoot %x}, got none)", tci, i, expHead.Header.Slot, expHead.Header.Hash())
continue
}
if ht.validated[i] != expHead {
vhead := ht.validated[i].Header
t.Errorf("Wrong validated head in test case #%d index #%d (expected {slot %d blockRoot %x}, got {slot %d blockRoot %x})", tci, i, expHead.Header.Slot, expHead.Header.Hash(), vhead.Slot, vhead.Hash())
}
}
for i := len(expHeads); i < len(ht.validated); i++ {
vhead := ht.validated[i].Header
t.Errorf("Unexpected validated head in test case #%d index #%d (expected none, got {slot %d blockRoot %x})", tci, i, vhead.Slot, vhead.Hash())
}
ht.validated = nil
}
func (ht *TestHeadTracker) SetPrefetchHead(head types.HeadInfo) {
ht.phead = head
}
func (ht *TestHeadTracker) ExpPrefetch(t *testing.T, tci int, exp types.HeadInfo) {
if ht.phead != exp {
t.Errorf("Wrong prefetch head in test case #%d (expected {slot %d blockRoot %x}, got {slot %d blockRoot %x})", tci, exp.Slot, exp.BlockRoot, ht.phead.Slot, ht.phead.BlockRoot)
}
}

@ -0,0 +1,42 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
)
var (
EvNewHead = &request.EventType{Name: "newHead"} // data: types.HeadInfo
EvNewSignedHead = &request.EventType{Name: "newSignedHead"} // data: types.SignedHeader
EvNewFinalityUpdate = &request.EventType{Name: "newFinalityUpdate"} // data: types.FinalityUpdate
)
type (
ReqUpdates struct {
FirstPeriod, Count uint64
}
RespUpdates struct {
Updates []*types.LightClientUpdate
Committees []*types.SerializedSyncCommittee
}
ReqHeader common.Hash
ReqCheckpointData common.Hash
ReqBeaconBlock common.Hash
)

@ -0,0 +1,299 @@
// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"sort"
"github.com/ethereum/go-ethereum/beacon/light"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
)
const maxUpdateRequest = 8 // maximum number of updates requested in a single request
type committeeChain interface {
CheckpointInit(bootstrap types.BootstrapData) error
InsertUpdate(update *types.LightClientUpdate, nextCommittee *types.SerializedSyncCommittee) error
NextSyncPeriod() (uint64, bool)
}
// CheckpointInit implements request.Module; it fetches the light client bootstrap
// data belonging to the given checkpoint hash and initializes the committee chain
// if successful.
type CheckpointInit struct {
chain committeeChain
checkpointHash common.Hash
locked request.ServerAndID
initialized bool
}
// NewCheckpointInit creates a new CheckpointInit.
func NewCheckpointInit(chain committeeChain, checkpointHash common.Hash) *CheckpointInit {
return &CheckpointInit{
chain: chain,
checkpointHash: checkpointHash,
}
}
// Process implements request.Module.
func (s *CheckpointInit) Process(requester request.Requester, events []request.Event) {
for _, event := range events {
if !event.IsRequestEvent() {
continue
}
sid, req, resp := event.RequestInfo()
if s.locked == sid {
s.locked = request.ServerAndID{}
}
if resp != nil {
if checkpoint := resp.(*types.BootstrapData); checkpoint.Header.Hash() == common.Hash(req.(ReqCheckpointData)) {
s.chain.CheckpointInit(*checkpoint)
s.initialized = true
return
}
requester.Fail(event.Server, "invalid checkpoint data")
}
}
// start a request if possible
if s.initialized || s.locked != (request.ServerAndID{}) {
return
}
cs := requester.CanSendTo()
if len(cs) == 0 {
return
}
server := cs[0]
id := requester.Send(server, ReqCheckpointData(s.checkpointHash))
s.locked = request.ServerAndID{Server: server, ID: id}
}
// ForwardUpdateSync implements request.Module; it fetches updates between the
// committee chain head and each server's announced head. Updates are fetched
// in batches and multiple batches can also be requested in parallel.
// Out of order responses are also handled; if a batch of updates cannot be added
// to the chain immediately because of a gap then the future updates are
// remembered until they can be processed.
type ForwardUpdateSync struct {
chain committeeChain
rangeLock rangeLock
lockedIDs map[request.ServerAndID]struct{}
processQueue []updateResponse
nextSyncPeriod map[request.Server]uint64
}
// NewForwardUpdateSync creates a new ForwardUpdateSync.
func NewForwardUpdateSync(chain committeeChain) *ForwardUpdateSync {
return &ForwardUpdateSync{
chain: chain,
rangeLock: make(rangeLock),
lockedIDs: make(map[request.ServerAndID]struct{}),
nextSyncPeriod: make(map[request.Server]uint64),
}
}
// rangeLock allows locking sections of an integer space, preventing the syncing
// mechanism from making requests again for sections where a not timed out request
// is already pending or where already fetched and unprocessed data is available.
type rangeLock map[uint64]int
// lock locks or unlocks the given section, depending on the sign of the add parameter.
func (r rangeLock) lock(first, count uint64, add int) {
for i := first; i < first+count; i++ {
if v := r[i] + add; v > 0 {
r[i] = v
} else {
delete(r, i)
}
}
}
// firstUnlocked returns the first unlocked section starting at or after start
// and not longer than maxCount.
func (r rangeLock) firstUnlocked(start, maxCount uint64) (first, count uint64) {
first = start
for {
if _, ok := r[first]; !ok {
break
}
first++
}
for {
count++
if count == maxCount {
break
}
if _, ok := r[first+count]; ok {
break
}
}
return
}
// lockRange locks the range belonging to the given update request, unless the
// same request has already been locked
func (s *ForwardUpdateSync) lockRange(sid request.ServerAndID, req ReqUpdates) {
if _, ok := s.lockedIDs[sid]; ok {
return
}
s.lockedIDs[sid] = struct{}{}
s.rangeLock.lock(req.FirstPeriod, req.Count, 1)
}
// unlockRange unlocks the range belonging to the given update request, unless
// same request has already been unlocked
func (s *ForwardUpdateSync) unlockRange(sid request.ServerAndID, req ReqUpdates) {
if _, ok := s.lockedIDs[sid]; !ok {
return
}
delete(s.lockedIDs, sid)
s.rangeLock.lock(req.FirstPeriod, req.Count, -1)
}
// verifyRange returns true if the number of updates and the individual update
// periods in the response match the requested section.
func (s *ForwardUpdateSync) verifyRange(request ReqUpdates, response RespUpdates) bool {
if uint64(len(response.Updates)) != request.Count || uint64(len(response.Committees)) != request.Count {
return false
}
for i, update := range response.Updates {
if update.AttestedHeader.Header.SyncPeriod() != request.FirstPeriod+uint64(i) {
return false
}
}
return true
}
// updateResponse is a response that has passed initial verification and has been
// queued for processing. Note that an update response cannot be processed until
// the previous updates have also been added to the chain.
type updateResponse struct {
sid request.ServerAndID
request ReqUpdates
response RespUpdates
}
// updateResponseList implements sort.Sort and sorts update request/response events by FirstPeriod.
type updateResponseList []updateResponse
func (u updateResponseList) Len() int { return len(u) }
func (u updateResponseList) Swap(i, j int) { u[i], u[j] = u[j], u[i] }
func (u updateResponseList) Less(i, j int) bool {
return u[i].request.FirstPeriod < u[j].request.FirstPeriod
}
// Process implements request.Module.
func (s *ForwardUpdateSync) Process(requester request.Requester, events []request.Event) {
for _, event := range events {
switch event.Type {
case request.EvResponse, request.EvFail, request.EvTimeout:
sid, rq, rs := event.RequestInfo()
req := rq.(ReqUpdates)
var queued bool
if event.Type == request.EvResponse {
resp := rs.(RespUpdates)
if s.verifyRange(req, resp) {
// there is a response with a valid format; put it in the process queue
s.processQueue = append(s.processQueue, updateResponse{sid: sid, request: req, response: resp})
s.lockRange(sid, req)
queued = true
} else {
requester.Fail(event.Server, "invalid update range")
}
}
if !queued {
s.unlockRange(sid, req)
}
case EvNewSignedHead:
signedHead := event.Data.(types.SignedHeader)
s.nextSyncPeriod[event.Server] = types.SyncPeriod(signedHead.SignatureSlot + 256)
case request.EvUnregistered:
delete(s.nextSyncPeriod, event.Server)
}
}
// try processing ordered list of available responses
sort.Sort(updateResponseList(s.processQueue))
for s.processQueue != nil {
u := s.processQueue[0]
if !s.processResponse(requester, u) {
break
}
s.unlockRange(u.sid, u.request)
s.processQueue = s.processQueue[1:]
if len(s.processQueue) == 0 {
s.processQueue = nil
}
}
// start new requests if possible
startPeriod, chainInit := s.chain.NextSyncPeriod()
if !chainInit {
return
}
for {
firstPeriod, maxCount := s.rangeLock.firstUnlocked(startPeriod, maxUpdateRequest)
var (
sendTo request.Server
bestCount uint64
)
for _, server := range requester.CanSendTo() {
nextPeriod := s.nextSyncPeriod[server]
if nextPeriod <= firstPeriod {
continue
}
count := maxCount
if nextPeriod < firstPeriod+maxCount {
count = nextPeriod - firstPeriod
}
if count > bestCount {
sendTo, bestCount = server, count
}
}
if sendTo == nil {
return
}
req := ReqUpdates{FirstPeriod: firstPeriod, Count: bestCount}
id := requester.Send(sendTo, req)
s.lockRange(request.ServerAndID{Server: sendTo, ID: id}, req)
}
}
// processResponse adds the fetched updates and committees to the committee chain.
// Returns true in case of full or partial success.
func (s *ForwardUpdateSync) processResponse(requester request.Requester, u updateResponse) (success bool) {
for i, update := range u.response.Updates {
if err := s.chain.InsertUpdate(update, u.response.Committees[i]); err != nil {
if err == light.ErrInvalidPeriod {
// there is a gap in the update periods; stop processing without
// failing and try again next time
return
}
if err == light.ErrInvalidUpdate || err == light.ErrWrongCommitteeRoot || err == light.ErrCannotReorg {
requester.Fail(u.sid.Server, "invalid update received")
} else {
log.Error("Unexpected InsertUpdate error", "error", err)
}
return
}
success = true
}
return
}

@ -0,0 +1,219 @@
// Copyright 2024 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package sync
import (
"testing"
"github.com/ethereum/go-ethereum/beacon/light/request"
"github.com/ethereum/go-ethereum/beacon/types"
)
func TestCheckpointInit(t *testing.T) {
chain := &TestCommitteeChain{}
checkpoint := &types.BootstrapData{Header: types.Header{Slot: 0x2000*4 + 0x1000}} // period 4
checkpointHash := checkpoint.Header.Hash()
chkInit := NewCheckpointInit(chain, checkpointHash)
ts := NewTestScheduler(t, chkInit)
// add 2 servers
ts.AddServer(testServer1, 1)
ts.AddServer(testServer2, 1)
// expect bootstrap request to server 1
ts.Run(1, testServer1, ReqCheckpointData(checkpointHash))
// server 1 times out; expect request to server 2
ts.RequestEvent(request.EvTimeout, ts.Request(1, 1), nil)
ts.Run(2, testServer2, ReqCheckpointData(checkpointHash))
// invalid response from server 2; expect init state to still be false
ts.RequestEvent(request.EvResponse, ts.Request(2, 1), &types.BootstrapData{Header: types.Header{Slot: 123456}})
ts.ExpFail(testServer2)
ts.Run(3)
chain.ExpInit(t, false)
// server 1 fails (hard timeout)
ts.RequestEvent(request.EvFail, ts.Request(1, 1), nil)
ts.Run(4)
chain.ExpInit(t, false)
// server 3 is registered; expect bootstrap request to server 3
ts.AddServer(testServer3, 1)
ts.Run(5, testServer3, ReqCheckpointData(checkpointHash))
// valid response from server 3; expect chain to be initialized
ts.RequestEvent(request.EvResponse, ts.Request(5, 1), checkpoint)
ts.Run(6)
chain.ExpInit(t, true)
}
func TestUpdateSyncParallel(t *testing.T) {
chain := &TestCommitteeChain{}
chain.SetNextSyncPeriod(0)
updateSync := NewForwardUpdateSync(chain)
ts := NewTestScheduler(t, updateSync)
// add 2 servers, head at period 100; allow 3-3 parallel requests for each
ts.AddServer(testServer1, 3)
ts.ServerEvent(EvNewSignedHead, testServer1, types.SignedHeader{SignatureSlot: 0x2000*100 + 0x1000})
ts.AddServer(testServer2, 3)
ts.ServerEvent(EvNewSignedHead, testServer2, types.SignedHeader{SignatureSlot: 0x2000*100 + 0x1000})
// expect 6 requests to be sent
ts.Run(1,
testServer1, ReqUpdates{FirstPeriod: 0, Count: 8},
testServer1, ReqUpdates{FirstPeriod: 8, Count: 8},
testServer1, ReqUpdates{FirstPeriod: 16, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 24, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 32, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 40, Count: 8})
// valid response to request 1; expect 8 periods synced and a new request started
ts.RequestEvent(request.EvResponse, ts.Request(1, 1), testRespUpdate(ts.Request(1, 1)))
ts.AddAllowance(testServer1, 1)
ts.Run(2, testServer1, ReqUpdates{FirstPeriod: 48, Count: 8})
chain.ExpNextSyncPeriod(t, 8)
// valid response to requests 4 and 5
ts.RequestEvent(request.EvResponse, ts.Request(1, 4), testRespUpdate(ts.Request(1, 4)))
ts.RequestEvent(request.EvResponse, ts.Request(1, 5), testRespUpdate(ts.Request(1, 5)))
ts.AddAllowance(testServer2, 2)
// expect 2 more requests but no sync progress (responses 4 and 5 cannot be added before 2 and 3)
ts.Run(3,
testServer2, ReqUpdates{FirstPeriod: 56, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 64, Count: 8})
chain.ExpNextSyncPeriod(t, 8)
// soft timeout for requests 2 and 3 (server 1 is overloaded)
ts.RequestEvent(request.EvTimeout, ts.Request(1, 2), nil)
ts.RequestEvent(request.EvTimeout, ts.Request(1, 3), nil)
// no allowance, no more requests
ts.Run(4)
// valid response to requests 6 and 8 and 9
ts.RequestEvent(request.EvResponse, ts.Request(1, 6), testRespUpdate(ts.Request(1, 6)))
ts.RequestEvent(request.EvResponse, ts.Request(3, 1), testRespUpdate(ts.Request(3, 1)))
ts.RequestEvent(request.EvResponse, ts.Request(3, 2), testRespUpdate(ts.Request(3, 2)))
ts.AddAllowance(testServer2, 3)
// server 2 can now resend requests 2 and 3 (timed out by server 1) and also send a new one
ts.Run(5,
testServer2, ReqUpdates{FirstPeriod: 8, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 16, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 72, Count: 8})
// server 1 finally answers timed out request 2
ts.RequestEvent(request.EvResponse, ts.Request(1, 2), testRespUpdate(ts.Request(1, 2)))
ts.AddAllowance(testServer1, 1)
// expect sync progress and one new request
ts.Run(6, testServer1, ReqUpdates{FirstPeriod: 80, Count: 8})
chain.ExpNextSyncPeriod(t, 16)
// server 2 answers requests 11 and 12 (resends of requests 2 and 3)
ts.RequestEvent(request.EvResponse, ts.Request(5, 1), testRespUpdate(ts.Request(5, 1)))
ts.RequestEvent(request.EvResponse, ts.Request(5, 2), testRespUpdate(ts.Request(5, 2)))
ts.AddAllowance(testServer2, 2)
ts.Run(7,
testServer2, ReqUpdates{FirstPeriod: 88, Count: 8},
testServer2, ReqUpdates{FirstPeriod: 96, Count: 4})
// finally the gap is filled, update can process responses up to req6
chain.ExpNextSyncPeriod(t, 48)
// all remaining requests are answered
ts.RequestEvent(request.EvResponse, ts.Request(1, 3), testRespUpdate(ts.Request(1, 3)))
ts.RequestEvent(request.EvResponse, ts.Request(2, 1), testRespUpdate(ts.Request(2, 1)))
ts.RequestEvent(request.EvResponse, ts.Request(5, 3), testRespUpdate(ts.Request(5, 3)))
ts.RequestEvent(request.EvResponse, ts.Request(6, 1), testRespUpdate(ts.Request(6, 1)))
ts.RequestEvent(request.EvResponse, ts.Request(7, 1), testRespUpdate(ts.Request(7, 1)))
ts.RequestEvent(request.EvResponse, ts.Request(7, 2), testRespUpdate(ts.Request(7, 2)))
ts.Run(8)
// expect chain to be fully synced
chain.ExpNextSyncPeriod(t, 100)
}
func TestUpdateSyncDifferentHeads(t *testing.T) {
chain := &TestCommitteeChain{}
chain.SetNextSyncPeriod(10)
updateSync := NewForwardUpdateSync(chain)
ts := NewTestScheduler(t, updateSync)
// add 3 servers with different announced head periods
ts.AddServer(testServer1, 1)
ts.ServerEvent(EvNewSignedHead, testServer1, types.SignedHeader{SignatureSlot: 0x2000*15 + 0x1000})
ts.AddServer(testServer2, 1)
ts.ServerEvent(EvNewSignedHead, testServer2, types.SignedHeader{SignatureSlot: 0x2000*16 + 0x1000})
ts.AddServer(testServer3, 1)
ts.ServerEvent(EvNewSignedHead, testServer3, types.SignedHeader{SignatureSlot: 0x2000*17 + 0x1000})
// expect request to the best announced head
ts.Run(1, testServer3, ReqUpdates{FirstPeriod: 10, Count: 7})
// request times out, expect request to the next best head
ts.RequestEvent(request.EvTimeout, ts.Request(1, 1), nil)
ts.Run(2, testServer2, ReqUpdates{FirstPeriod: 10, Count: 6})
// request times out, expect request to the last available server
ts.RequestEvent(request.EvTimeout, ts.Request(2, 1), nil)
ts.Run(3, testServer1, ReqUpdates{FirstPeriod: 10, Count: 5})
// valid response to request 3, expect chain synced to period 15
ts.RequestEvent(request.EvResponse, ts.Request(3, 1), testRespUpdate(ts.Request(3, 1)))
ts.AddAllowance(testServer1, 1)
ts.Run(4)
chain.ExpNextSyncPeriod(t, 15)
// invalid response to request 1, server can only deliver updates up to period 15 despite announced head
truncated := ts.Request(1, 1)
truncated.request = ReqUpdates{FirstPeriod: 10, Count: 5}
ts.RequestEvent(request.EvResponse, ts.Request(1, 1), testRespUpdate(truncated))
ts.ExpFail(testServer3)
ts.Run(5)
// expect no progress of chain head
chain.ExpNextSyncPeriod(t, 15)
// valid response to request 2, expect chain synced to period 16
ts.RequestEvent(request.EvResponse, ts.Request(2, 1), testRespUpdate(ts.Request(2, 1)))
ts.AddAllowance(testServer2, 1)
ts.Run(6)
chain.ExpNextSyncPeriod(t, 16)
// a new server is registered with announced head period 17
ts.AddServer(testServer4, 1)
ts.ServerEvent(EvNewSignedHead, testServer4, types.SignedHeader{SignatureSlot: 0x2000*17 + 0x1000})
// expect request to sync one more period
ts.Run(7, testServer4, ReqUpdates{FirstPeriod: 16, Count: 1})
// valid response, expect chain synced to period 17
ts.RequestEvent(request.EvResponse, ts.Request(7, 1), testRespUpdate(ts.Request(7, 1)))
ts.AddAllowance(testServer4, 1)
ts.Run(8)
chain.ExpNextSyncPeriod(t, 17)
}
func testRespUpdate(request requestWithID) request.Response {
var resp RespUpdates
if request.request == nil {
return resp
}
req := request.request.(ReqUpdates)
resp.Updates = make([]*types.LightClientUpdate, int(req.Count))
resp.Committees = make([]*types.SerializedSyncCommittee, int(req.Count))
period := req.FirstPeriod
for i := range resp.Updates {
resp.Updates[i] = &types.LightClientUpdate{AttestedHeader: types.SignedHeader{Header: types.Header{Slot: 0x2000*period + 0x1000}}}
resp.Committees[i] = new(types.SerializedSyncCommittee)
period++
}
return resp
}

@ -41,4 +41,6 @@ const (
StateIndexNextSyncCommittee = 55
StateIndexExecPayload = 56
StateIndexExecHead = 908
BodyIndexExecPayload = 25
)

@ -20,11 +20,20 @@ import (
"errors"
"fmt"
"github.com/ethereum/go-ethereum/beacon/engine"
"github.com/ethereum/go-ethereum/beacon/merkle"
"github.com/ethereum/go-ethereum/beacon/params"
"github.com/ethereum/go-ethereum/common"
"github.com/protolambda/zrnt/eth2/beacon/capella"
"github.com/protolambda/ztyp/tree"
)
// HeadInfo represents an unvalidated new head announcement.
type HeadInfo struct {
Slot uint64
BlockRoot common.Hash
}
// BootstrapData contains a sync committee where light sync can be started,
// together with a proof through a beacon header and corresponding state.
// Note: BootstrapData is fetched from a server based on a known checkpoint hash.
@ -134,3 +143,50 @@ func (u UpdateScore) BetterThan(w UpdateScore) bool {
}
return u.SignerCount > w.SignerCount
}
type HeaderWithExecProof struct {
Header
PayloadHeader *capella.ExecutionPayloadHeader
PayloadBranch merkle.Values
}
func (h *HeaderWithExecProof) Validate() error {
payloadRoot := merkle.Value(h.PayloadHeader.HashTreeRoot(tree.GetHashFn()))
return merkle.VerifyProof(h.BodyRoot, params.BodyIndexExecPayload, h.PayloadBranch, payloadRoot)
}
type FinalityUpdate struct {
Attested, Finalized HeaderWithExecProof
FinalityBranch merkle.Values
// Sync committee BLS signature aggregate
Signature SyncAggregate
// Slot in which the signature has been created (newer than Header.Slot,
// determines the signing sync committee)
SignatureSlot uint64
}
func (u *FinalityUpdate) SignedHeader() SignedHeader {
return SignedHeader{
Header: u.Attested.Header,
Signature: u.Signature,
SignatureSlot: u.SignatureSlot,
}
}
func (u *FinalityUpdate) Validate() error {
if err := u.Attested.Validate(); err != nil {
return err
}
if err := u.Finalized.Validate(); err != nil {
return err
}
return merkle.VerifyProof(u.Attested.StateRoot, params.StateIndexFinalBlock, u.FinalityBranch, merkle.Value(u.Finalized.Hash()))
}
// ChainHeadEvent returns an authenticated execution payload associated with the
// latest accepted head of the beacon chain, along with the hash of the latest
// finalized execution block.
type ChainHeadEvent struct {
HeadBlock *engine.ExecutableData
Finalized common.Hash
}

@ -0,0 +1,69 @@
// Copyright 2024 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"context"
"time"
"github.com/ethereum/go-ethereum/beacon/engine"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rpc"
)
func updateEngineApi(client *rpc.Client, headCh chan types.ChainHeadEvent) {
for event := range headCh {
if client == nil { // dry run, no engine API specified
log.Info("New execution block retrieved", "block number", event.HeadBlock.Number, "block hash", event.HeadBlock.BlockHash, "finalized block hash", event.Finalized)
} else {
if status, err := callNewPayloadV2(client, event.HeadBlock); err == nil {
log.Info("Successful NewPayload", "block number", event.HeadBlock.Number, "block hash", event.HeadBlock.BlockHash, "status", status)
} else {
log.Error("Failed NewPayload", "block number", event.HeadBlock.Number, "block hash", event.HeadBlock.BlockHash, "error", err)
}
if status, err := callForkchoiceUpdatedV1(client, event.HeadBlock.BlockHash, event.Finalized); err == nil {
log.Info("Successful ForkchoiceUpdated", "head", event.HeadBlock.BlockHash, "status", status)
} else {
log.Error("Failed ForkchoiceUpdated", "head", event.HeadBlock.BlockHash, "error", err)
}
}
}
}
func callNewPayloadV2(client *rpc.Client, execData *engine.ExecutableData) (string, error) {
var resp engine.PayloadStatusV1
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
err := client.CallContext(ctx, &resp, "engine_newPayloadV2", execData)
cancel()
return resp.Status, err
}
func callForkchoiceUpdatedV1(client *rpc.Client, headHash, finalizedHash common.Hash) (string, error) {
var resp engine.ForkChoiceResponse
update := engine.ForkchoiceStateV1{
HeadBlockHash: headHash,
SafeBlockHash: finalizedHash,
FinalizedBlockHash: finalizedHash,
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
err := client.CallContext(ctx, &resp, "engine_forkchoiceUpdatedV1", update, nil)
cancel()
return resp.PayloadStatus.Status, err
}

@ -0,0 +1,125 @@
// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"context"
"fmt"
"io"
"os"
"github.com/ethereum/go-ethereum/beacon/blsync"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/internal/flags"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/rpc"
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
"github.com/urfave/cli/v2"
)
var (
verbosityFlag = &cli.IntFlag{
Name: "verbosity",
Usage: "Logging verbosity: 0=silent, 1=error, 2=warn, 3=info, 4=debug, 5=detail",
Value: 3,
Category: flags.LoggingCategory,
}
vmoduleFlag = &cli.StringFlag{
Name: "vmodule",
Usage: "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=5,p2p=4)",
Value: "",
Hidden: true,
Category: flags.LoggingCategory,
}
)
func main() {
app := flags.NewApp("beacon light syncer tool")
app.Flags = []cli.Flag{
utils.BeaconApiFlag,
utils.BeaconApiHeaderFlag,
utils.BeaconThresholdFlag,
utils.BeaconNoFilterFlag,
utils.BeaconConfigFlag,
utils.BeaconGenesisRootFlag,
utils.BeaconGenesisTimeFlag,
utils.BeaconCheckpointFlag,
//TODO datadir for optional permanent database
utils.MainnetFlag,
utils.SepoliaFlag,
utils.GoerliFlag,
utils.BlsyncApiFlag,
utils.BlsyncJWTSecretFlag,
verbosityFlag,
vmoduleFlag,
}
app.Action = sync
if err := app.Run(os.Args); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func sync(ctx *cli.Context) error {
usecolor := (isatty.IsTerminal(os.Stderr.Fd()) || isatty.IsCygwinTerminal(os.Stderr.Fd())) && os.Getenv("TERM") != "dumb"
output := io.Writer(os.Stderr)
if usecolor {
output = colorable.NewColorable(os.Stderr)
}
verbosity := log.FromLegacyLevel(ctx.Int(verbosityFlag.Name))
log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(output, verbosity, usecolor)))
headCh := make(chan types.ChainHeadEvent, 16)
client := blsync.NewClient(ctx)
sub := client.SubscribeChainHeadEvent(headCh)
go updateEngineApi(makeRPCClient(ctx), headCh)
client.Start()
// run until stopped
<-ctx.Done()
client.Stop()
sub.Unsubscribe()
close(headCh)
return nil
}
func makeRPCClient(ctx *cli.Context) *rpc.Client {
if !ctx.IsSet(utils.BlsyncApiFlag.Name) {
log.Warn("No engine API target specified, performing a dry run")
return nil
}
if !ctx.IsSet(utils.BlsyncJWTSecretFlag.Name) {
utils.Fatalf("JWT secret parameter missing") //TODO use default if datadir is specified
}
engineApiUrl, jwtFileName := ctx.String(utils.BlsyncApiFlag.Name), ctx.String(utils.BlsyncJWTSecretFlag.Name)
var jwtSecret [32]byte
if jwt, err := node.ObtainJWTSecret(jwtFileName); err == nil {
copy(jwtSecret[:], jwt)
} else {
utils.Fatalf("Error loading or generating JWT secret: %v", err)
}
auth := node.NewJWTAuth(jwtSecret)
cl, err := rpc.DialOptions(context.Background(), engineApiUrl, rpc.WithHTTPAuth(auth))
if err != nil {
utils.Fatalf("Could not create RPC client: %v", err)
}
return cl
}

@ -31,6 +31,7 @@ import (
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/accounts/scwallet"
"github.com/ethereum/go-ethereum/accounts/usbwallet"
"github.com/ethereum/go-ethereum/beacon/blsync"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
@ -221,6 +222,8 @@ func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
}
catalyst.RegisterSimulatedBeaconAPIs(stack, simBeacon)
stack.RegisterLifecycle(simBeacon)
} else if ctx.IsSet(utils.BeaconApiFlag.Name) {
stack.RegisterLifecycle(catalyst.NewBlsync(blsync.NewClient(ctx), eth))
} else {
err := catalyst.Register(stack, eth)
if err != nil {

@ -146,6 +146,14 @@ var (
configFileFlag,
utils.LogDebugFlag,
utils.LogBacktraceAtFlag,
utils.BeaconApiFlag,
utils.BeaconApiHeaderFlag,
utils.BeaconThresholdFlag,
utils.BeaconNoFilterFlag,
utils.BeaconConfigFlag,
utils.BeaconGenesisRootFlag,
utils.BeaconGenesisTimeFlag,
utils.BeaconCheckpointFlag,
}, utils.NetworkFlags, utils.DatabaseFlags)
rpcFlags = []cli.Flag{

@ -36,6 +36,7 @@ import (
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/keystore"
bparams "github.com/ethereum/go-ethereum/beacon/params"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/fdlimit"
"github.com/ethereum/go-ethereum/core"
@ -281,6 +282,58 @@ var (
Value: ethconfig.Defaults.TransactionHistory,
Category: flags.StateCategory,
}
// Beacon client light sync settings
BeaconApiFlag = &cli.StringSliceFlag{
Name: "beacon.api",
Usage: "Beacon node (CL) light client API URL. This flag can be given multiple times.",
Category: flags.BeaconCategory,
}
BeaconApiHeaderFlag = &cli.StringSliceFlag{
Name: "beacon.api.header",
Usage: "Pass custom HTTP header fields to the emote beacon node API in \"key:value\" format. This flag can be given multiple times.",
Category: flags.BeaconCategory,
}
BeaconThresholdFlag = &cli.IntFlag{
Name: "beacon.threshold",
Usage: "Beacon sync committee participation threshold",
Value: bparams.SyncCommitteeSupermajority,
Category: flags.BeaconCategory,
}
BeaconNoFilterFlag = &cli.BoolFlag{
Name: "beacon.nofilter",
Usage: "Disable future slot signature filter",
Category: flags.BeaconCategory,
}
BeaconConfigFlag = &cli.StringFlag{
Name: "beacon.config",
Usage: "Beacon chain config YAML file",
Category: flags.BeaconCategory,
}
BeaconGenesisRootFlag = &cli.StringFlag{
Name: "beacon.genesis.gvroot",
Usage: "Beacon chain genesis validators root",
Category: flags.BeaconCategory,
}
BeaconGenesisTimeFlag = &cli.Uint64Flag{
Name: "beacon.genesis.time",
Usage: "Beacon chain genesis time",
Category: flags.BeaconCategory,
}
BeaconCheckpointFlag = &cli.StringFlag{
Name: "beacon.checkpoint",
Usage: "Beacon chain weak subjectivity checkpoint block hash",
Category: flags.BeaconCategory,
}
BlsyncApiFlag = &cli.StringFlag{
Name: "blsync.engine.api",
Usage: "Target EL engine API URL",
Category: flags.BeaconCategory,
}
BlsyncJWTSecretFlag = &cli.StringFlag{
Name: "blsync.jwtsecret",
Usage: "Path to a JWT secret to use for target engine API endpoint",
Category: flags.BeaconCategory,
}
// Transaction pool settings
TxPoolLocalsFlag = &cli.StringFlag{
Name: "txpool.locals",

@ -0,0 +1,88 @@
// Copyright 2024 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package catalyst
import (
"github.com/ethereum/go-ethereum/beacon/engine"
"github.com/ethereum/go-ethereum/beacon/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
)
// Blsync tracks the head of the beacon chain through the beacon light client
// and drives the local node via ConsensusAPI.
type Blsync struct {
engine *ConsensusAPI
client Client
headCh chan types.ChainHeadEvent
headSub event.Subscription
quitCh chan struct{}
}
type Client interface {
SubscribeChainHeadEvent(ch chan<- types.ChainHeadEvent) event.Subscription
Start()
Stop()
}
// NewBlsync creates a new beacon light syncer.
func NewBlsync(client Client, eth *eth.Ethereum) *Blsync {
return &Blsync{
engine: newConsensusAPIWithoutHeartbeat(eth),
client: client,
headCh: make(chan types.ChainHeadEvent, 16),
quitCh: make(chan struct{}),
}
}
// Start starts underlying beacon light client and the sync logic for driving
// the local node.
func (b *Blsync) Start() error {
log.Info("Beacon light sync started")
b.headSub = b.client.SubscribeChainHeadEvent(b.headCh)
go b.client.Start()
for {
select {
case <-b.quitCh:
return nil
case head := <-b.headCh:
if _, err := b.engine.NewPayloadV2(*head.HeadBlock); err != nil {
log.Error("failed to send new payload", "err", err)
continue
}
update := engine.ForkchoiceStateV1{
HeadBlockHash: head.HeadBlock.BlockHash,
SafeBlockHash: head.Finalized, //TODO pass finalized or empty hash here?
FinalizedBlockHash: head.Finalized,
}
if _, err := b.engine.ForkchoiceUpdatedV1(update, nil); err != nil {
log.Error("failed to send forkchoice updated", "err", err)
continue
}
}
}
}
// Stop signals to the light client and syncer to exit.
func (b *Blsync) Stop() error {
b.client.Stop()
close(b.quitCh)
return nil
}

@ -19,7 +19,8 @@ require (
github.com/crate-crypto/go-kzg-4844 v0.7.0
github.com/davecgh/go-spew v1.1.1
github.com/deckarep/golang-set/v2 v2.1.0
github.com/dop251/goja v0.0.0-20230806174421-c933cf95e127
github.com/donovanhide/eventsource v0.0.0-20210830082556-c59027999da0
github.com/dop251/goja v0.0.0-20230605162241-28ee0ee714f3
github.com/ethereum/c-kzg-4844 v0.4.0
github.com/fatih/color v1.13.0
github.com/ferranbt/fastssz v0.1.2
@ -54,6 +55,8 @@ require (
github.com/olekukonko/tablewriter v0.0.5
github.com/peterh/liner v1.1.1-0.20190123174540-a2c9a5303de7
github.com/protolambda/bls12-381-util v0.0.0-20220416220906-d8552aa452c7
github.com/protolambda/zrnt v0.30.0
github.com/protolambda/ztyp v0.2.2
github.com/rs/cors v1.7.0
github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible
github.com/status-im/keycard-go v0.2.0

@ -149,9 +149,11 @@ github.com/dlclark/regexp2 v1.4.1-0.20201116162257-a2a8dda75c91/go.mod h1:2pZnwu
github.com/dlclark/regexp2 v1.7.0 h1:7lJfhqlPssTb1WQx4yvTHN0uElPEv52sbaECrAQxjAo=
github.com/dlclark/regexp2 v1.7.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
github.com/dnaeon/go-vcr v1.2.0 h1:zHCHvJYTMh1N7xnV7zf1m1GPBF9Ad0Jk/whtQ1663qI=
github.com/donovanhide/eventsource v0.0.0-20210830082556-c59027999da0 h1:C7t6eeMaEQVy6e8CarIhscYQlNmw5e3G36y7l7Y21Ao=
github.com/donovanhide/eventsource v0.0.0-20210830082556-c59027999da0/go.mod h1:56wL82FO0bfMU5RvfXoIwSOP2ggqqxT+tAfNEIyxuHw=
github.com/dop251/goja v0.0.0-20211022113120-dc8c55024d06/go.mod h1:R9ET47fwRVRPZnOGvHxxhuZcbrMCuiqOz3Rlrh4KSnk=
github.com/dop251/goja v0.0.0-20230806174421-c933cf95e127 h1:qwcF+vdFrvPSEUDSX5RVoRccG8a5DhOdWdQ4zN62zzo=
github.com/dop251/goja v0.0.0-20230806174421-c933cf95e127/go.mod h1:QMWlm50DNe14hD7t24KEqZuUdC9sOTy8W6XbCU1mlw4=
github.com/dop251/goja v0.0.0-20230605162241-28ee0ee714f3 h1:+3HCtB74++ClLy8GgjUQYeC8R4ILzVcIe8+5edAJJnE=
github.com/dop251/goja v0.0.0-20230605162241-28ee0ee714f3/go.mod h1:QMWlm50DNe14hD7t24KEqZuUdC9sOTy8W6XbCU1mlw4=
github.com/dop251/goja_nodejs v0.0.0-20210225215109-d91c329300e7/go.mod h1:hn7BA7c8pLvoGndExHudxTDKZ84Pyvv+90pbBjbTz0Y=
github.com/dop251/goja_nodejs v0.0.0-20211022123610-8dd9abb0616d/go.mod h1:DngW8aVqWbuLRMHItjPUyqdj+HWPvnQe8V8y1nDpIbM=
github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
@ -239,6 +241,7 @@ github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaS
github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
github.com/golang/snappy v0.0.3/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb h1:PBC98N2aIaM3XXiurYmW7fx4GZkL8feAMVq7nEjURHk=
github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
@ -298,6 +301,7 @@ github.com/holiman/billy v0.0.0-20240216141850-2abb0c79d3c4 h1:X4egAf/gcS1zATw6w
github.com/holiman/billy v0.0.0-20240216141850-2abb0c79d3c4/go.mod h1:5GuXa7vkL8u9FkFuWdVvfR5ix8hRB7DbOAaYULamFpc=
github.com/holiman/bloomfilter/v2 v2.0.3 h1:73e0e/V0tCydx14a0SCYS/EWCxgwLZ18CZcZKVu0fao=
github.com/holiman/bloomfilter/v2 v2.0.3/go.mod h1:zpoh+gs7qcpqrHr3dB55AMiJwo0iURXE7ZOP9L9hSkA=
github.com/holiman/uint256 v1.2.0/go.mod h1:y4ga/t+u+Xwd7CpDgZESaRcWy0I7XMlTMA25ApIH5Jw=
github.com/holiman/uint256 v1.2.4 h1:jUc4Nk8fm9jZabQuqr2JzednajVmBpC+oiTiXZJEApU=
github.com/holiman/uint256 v1.2.4/go.mod h1:EOMSn4q6Nyt9P6efbI3bueV4e1b3dGlUCXeiRV4ng7E=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
@ -380,6 +384,7 @@ github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh
github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 h1:I0XW9+e1XWDxdcEniV4rQAIOPUGDq67JSCiRCgGCZLI=
github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
github.com/minio/sha256-simd v0.1.0/go.mod h1:2FMWW+8GMoPweT6+pI63m9YE3Lmw4J71hV56Chs1E/U=
github.com/minio/sha256-simd v1.0.0 h1:v1ta+49hkWZyvaKwrQB8elexRqm6Y0aMLjCNsrYxo6g=
github.com/minio/sha256-simd v1.0.0/go.mod h1:OuYzVNI5vcoYIAmbIvHPl3N3jUzVedXbKy5RFepssQM=
github.com/mitchellh/mapstructure v1.4.1 h1:CpVNEelQCZBooIPDn+AR3NpivK/TIKU8bDxdASFVQag=
@ -448,8 +453,14 @@ github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4O
github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
github.com/prometheus/procfs v0.7.3 h1:4jVXhlkAyzOScmCkXBTOLRLTz8EeU+eyjrwB/EPq0VU=
github.com/prometheus/procfs v0.7.3/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
github.com/protolambda/bls12-381-util v0.0.0-20210720105258-a772f2aac13e/go.mod h1:MPZvj2Pr0N8/dXyTPS5REeg2sdLG7t8DRzC1rLv925w=
github.com/protolambda/bls12-381-util v0.0.0-20220416220906-d8552aa452c7 h1:cZC+usqsYgHtlBaGulVnZ1hfKAi8iWtujBnRLQE698c=
github.com/protolambda/bls12-381-util v0.0.0-20220416220906-d8552aa452c7/go.mod h1:IToEjHuttnUzwZI5KBSM/LOOW3qLbbrHOEfp3SbECGY=
github.com/protolambda/messagediff v1.4.0/go.mod h1:LboJp0EwIbJsePYpzh5Op/9G1/4mIztMRYzzwR0dR2M=
github.com/protolambda/zrnt v0.30.0 h1:pHEn69ZgaDFGpLGGYG1oD7DvYI7RDirbMBPfbC+8p4g=
github.com/protolambda/zrnt v0.30.0/go.mod h1:qcdX9CXFeVNCQK/q0nswpzhd+31RHMk2Ax/2lMsJ4Jw=
github.com/protolambda/ztyp v0.2.2 h1:rVcL3vBu9W/aV646zF6caLS/dyn9BN8NYiuJzicLNyY=
github.com/protolambda/ztyp v0.2.2/go.mod h1:9bYgKGqg3wJqT9ac1gI2hnVb0STQq7p/1lapqrqY1dU=
github.com/prysmaticlabs/gohashtree v0.0.1-alpha.0.20220714111606-acbb2962fb48 h1:cSo6/vk8YpvkLbk9v3FO97cakNmUoxwi2KMP8hd5WIw=
github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
@ -842,6 +853,7 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

@ -20,6 +20,7 @@ import "github.com/urfave/cli/v2"
const (
EthCategory = "ETHEREUM"
BeaconCategory = "BEACON CHAIN"
LightCategory = "LIGHT CLIENT"
DevCategory = "DEVELOPER CHAIN"
StateCategory = "STATE HISTORY MANAGEMENT"

@ -339,15 +339,9 @@ func (n *Node) closeDataDir() {
}
}
// obtainJWTSecret loads the jwt-secret, either from the provided config,
// or from the default location. If neither of those are present, it generates
// a new secret and stores to the default location.
func (n *Node) obtainJWTSecret(cliParam string) ([]byte, error) {
fileName := cliParam
if len(fileName) == 0 {
// no path provided, use default
fileName = n.ResolvePath(datadirJWTKey)
}
// ObtainJWTSecret loads the jwt-secret from the provided config. If the file is not
// present, it generates a new secret and stores to the given location.
func ObtainJWTSecret(fileName string) ([]byte, error) {
// try reading from file
if data, err := os.ReadFile(fileName); err == nil {
jwtSecret := common.FromHex(strings.TrimSpace(string(data)))
@ -373,6 +367,18 @@ func (n *Node) obtainJWTSecret(cliParam string) ([]byte, error) {
return jwtSecret, nil
}
// obtainJWTSecret loads the jwt-secret, either from the provided config,
// or from the default location. If neither of those are present, it generates
// a new secret and stores to the default location.
func (n *Node) obtainJWTSecret(cliParam string) ([]byte, error) {
fileName := cliParam
if len(fileName) == 0 {
// no path provided, use default
fileName = n.ResolvePath(datadirJWTKey)
}
return ObtainJWTSecret(fileName)
}
// startRPC is a helper method to configure all the various RPC endpoints during node
// startup. It's not meant to be called at any time afterwards as it makes certain
// assumptions about the state of the node.

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