Official Go implementation of the Ethereum protocol
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go-ethereum/node/api.go

352 lines
9.7 KiB

// Copyright 2015 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 node
import (
"context"
"fmt"
"strings"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/internal/debug"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/rpc"
)
// apis returns the collection of built-in RPC APIs.
func (n *Node) apis() []rpc.API {
return []rpc.API{
{
Namespace: "admin",
Service: &adminAPI{n},
}, {
Namespace: "debug",
Service: debug.Handler,
}, {
Namespace: "debug",
Service: &p2pDebugAPI{n},
}, {
Namespace: "web3",
Service: &web3API{n},
},
}
}
// adminAPI is the collection of administrative API methods exposed over
// both secure and unsecure RPC channels.
type adminAPI struct {
node *Node // Node interfaced by this API
}
// AddPeer requests connecting to a remote node, and also maintaining the new
// connection at all times, even reconnecting if it is lost.
func (api *adminAPI) AddPeer(url string) (bool, error) {
// Make sure the server is running, fail otherwise
server := api.node.Server()
if server == nil {
return false, ErrNodeStopped
}
// Try to add the url as a static peer and return
node, err := enode.Parse(enode.ValidSchemes, url)
if err != nil {
return false, fmt.Errorf("invalid enode: %v", err)
}
server.AddPeer(node)
return true, nil
}
// RemovePeer disconnects from a remote node if the connection exists
func (api *adminAPI) RemovePeer(url string) (bool, error) {
// Make sure the server is running, fail otherwise
server := api.node.Server()
if server == nil {
return false, ErrNodeStopped
}
// Try to remove the url as a static peer and return
node, err := enode.Parse(enode.ValidSchemes, url)
if err != nil {
return false, fmt.Errorf("invalid enode: %v", err)
}
server.RemovePeer(node)
return true, nil
}
// AddTrustedPeer allows a remote node to always connect, even if slots are full
func (api *adminAPI) AddTrustedPeer(url string) (bool, error) {
// Make sure the server is running, fail otherwise
server := api.node.Server()
if server == nil {
return false, ErrNodeStopped
}
node, err := enode.Parse(enode.ValidSchemes, url)
if err != nil {
return false, fmt.Errorf("invalid enode: %v", err)
}
server.AddTrustedPeer(node)
return true, nil
}
// RemoveTrustedPeer removes a remote node from the trusted peer set, but it
// does not disconnect it automatically.
func (api *adminAPI) RemoveTrustedPeer(url string) (bool, error) {
// Make sure the server is running, fail otherwise
server := api.node.Server()
if server == nil {
return false, ErrNodeStopped
}
node, err := enode.Parse(enode.ValidSchemes, url)
if err != nil {
return false, fmt.Errorf("invalid enode: %v", err)
}
server.RemoveTrustedPeer(node)
return true, nil
}
// PeerEvents creates an RPC subscription which receives peer events from the
// node's p2p.Server
func (api *adminAPI) PeerEvents(ctx context.Context) (*rpc.Subscription, error) {
// Make sure the server is running, fail otherwise
server := api.node.Server()
if server == nil {
return nil, ErrNodeStopped
}
// Create the subscription
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
rpcSub := notifier.CreateSubscription()
go func() {
events := make(chan *p2p.PeerEvent)
sub := server.SubscribeEvents(events)
defer sub.Unsubscribe()
for {
select {
case event := <-events:
notifier.Notify(rpcSub.ID, event)
case <-sub.Err():
return
case <-rpcSub.Err():
return
}
}
}()
return rpcSub, nil
}
// StartHTTP starts the HTTP RPC API server.
func (api *adminAPI) StartHTTP(host *string, port *int, cors *string, apis *string, vhosts *string) (bool, error) {
api.node.lock.Lock()
defer api.node.lock.Unlock()
// Determine host and port.
if host == nil {
h := DefaultHTTPHost
if api.node.config.HTTPHost != "" {
h = api.node.config.HTTPHost
}
host = &h
}
if port == nil {
port = &api.node.config.HTTPPort
}
// Determine config.
config := httpConfig{
CorsAllowedOrigins: api.node.config.HTTPCors,
Vhosts: api.node.config.HTTPVirtualHosts,
Modules: api.node.config.HTTPModules,
rpcEndpointConfig: rpcEndpointConfig{
batchItemLimit: api.node.config.BatchRequestLimit,
batchResponseSizeLimit: api.node.config.BatchResponseMaxSize,
},
}
if cors != nil {
config.CorsAllowedOrigins = nil
for _, origin := range strings.Split(*cors, ",") {
config.CorsAllowedOrigins = append(config.CorsAllowedOrigins, strings.TrimSpace(origin))
}
}
if vhosts != nil {
config.Vhosts = nil
for _, vhost := range strings.Split(*host, ",") {
config.Vhosts = append(config.Vhosts, strings.TrimSpace(vhost))
}
}
if apis != nil {
config.Modules = nil
for _, m := range strings.Split(*apis, ",") {
config.Modules = append(config.Modules, strings.TrimSpace(m))
}
}
if err := api.node.http.setListenAddr(*host, *port); err != nil {
return false, err
}
if err := api.node.http.enableRPC(api.node.rpcAPIs, config); err != nil {
return false, err
}
if err := api.node.http.start(); err != nil {
return false, err
}
return true, nil
}
// StartRPC starts the HTTP RPC API server.
// Deprecated: use StartHTTP instead.
func (api *adminAPI) StartRPC(host *string, port *int, cors *string, apis *string, vhosts *string) (bool, error) {
log.Warn("Deprecation warning", "method", "admin.StartRPC", "use-instead", "admin.StartHTTP")
return api.StartHTTP(host, port, cors, apis, vhosts)
}
// StopHTTP shuts down the HTTP server.
func (api *adminAPI) StopHTTP() (bool, error) {
api.node.http.stop()
return true, nil
}
// StopRPC shuts down the HTTP server.
// Deprecated: use StopHTTP instead.
func (api *adminAPI) StopRPC() (bool, error) {
log.Warn("Deprecation warning", "method", "admin.StopRPC", "use-instead", "admin.StopHTTP")
return api.StopHTTP()
}
// StartWS starts the websocket RPC API server.
func (api *adminAPI) StartWS(host *string, port *int, allowedOrigins *string, apis *string) (bool, error) {
api.node.lock.Lock()
defer api.node.lock.Unlock()
// Determine host and port.
if host == nil {
h := DefaultWSHost
if api.node.config.WSHost != "" {
h = api.node.config.WSHost
}
host = &h
}
if port == nil {
port = &api.node.config.WSPort
}
// Determine config.
config := wsConfig{
Modules: api.node.config.WSModules,
Origins: api.node.config.WSOrigins,
// ExposeAll: api.node.config.WSExposeAll,
rpcEndpointConfig: rpcEndpointConfig{
batchItemLimit: api.node.config.BatchRequestLimit,
batchResponseSizeLimit: api.node.config.BatchResponseMaxSize,
},
}
if apis != nil {
config.Modules = nil
for _, m := range strings.Split(*apis, ",") {
config.Modules = append(config.Modules, strings.TrimSpace(m))
}
}
if allowedOrigins != nil {
config.Origins = nil
for _, origin := range strings.Split(*allowedOrigins, ",") {
config.Origins = append(config.Origins, strings.TrimSpace(origin))
}
}
// Enable WebSocket on the server.
server := api.node.wsServerForPort(*port, false)
if err := server.setListenAddr(*host, *port); err != nil {
return false, err
}
openApis, _ := api.node.getAPIs()
if err := server.enableWS(openApis, config); err != nil {
return false, err
}
if err := server.start(); err != nil {
return false, err
}
api.node.http.log.Info("WebSocket endpoint opened", "url", api.node.WSEndpoint())
return true, nil
}
// StopWS terminates all WebSocket servers.
func (api *adminAPI) StopWS() (bool, error) {
api.node.http.stopWS()
api.node.ws.stop()
return true, nil
}
// Peers retrieves all the information we know about each individual peer at the
// protocol granularity.
func (api *adminAPI) Peers() ([]*p2p.PeerInfo, error) {
server := api.node.Server()
if server == nil {
return nil, ErrNodeStopped
}
return server.PeersInfo(), nil
}
// NodeInfo retrieves all the information we know about the host node at the
// protocol granularity.
func (api *adminAPI) NodeInfo() (*p2p.NodeInfo, error) {
server := api.node.Server()
if server == nil {
return nil, ErrNodeStopped
}
return server.NodeInfo(), nil
}
// Datadir retrieves the current data directory the node is using.
func (api *adminAPI) Datadir() string {
return api.node.DataDir()
}
// web3API offers helper utils
type web3API struct {
stack *Node
}
// ClientVersion returns the node name
func (s *web3API) ClientVersion() string {
return s.stack.Server().Name
}
// Sha3 applies the ethereum sha3 implementation on the input.
// It assumes the input is hex encoded.
func (s *web3API) Sha3(input hexutil.Bytes) hexutil.Bytes {
return crypto.Keccak256(input)
}
// p2pDebugAPI provides access to p2p internals for debugging.
type p2pDebugAPI struct {
stack *Node
}
func (s *p2pDebugAPI) DiscoveryV4Table() [][]discover.BucketNode {
disc := s.stack.server.DiscoveryV4()
if disc != nil {
return disc.TableBuckets()
}
return nil
}