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