forked from cerc-io/plugeth
p2p/discover: concurrent TALKREQ handling (#27112)
This changes TALKREQ message processing to run the handler on separate goroutine, instead of running on the main discv5 dispatcher goroutine. It's better this way because it allows the handler to perform blocking actions. I'm also adding a new method TalkRequestToID here. The method allows implementing a request flow where one node A sends TALKREQ to another node B, and node B later sends a TALKREQ back. With TalkRequestToID, node B does not need the ENR of A to send its request.
This commit is contained in:
parent
8f373227ac
commit
47cdea5ac5
@ -52,6 +52,7 @@ func newTestTable(t transport) (*Table, *enode.DB) {
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func nodeAtDistance(base enode.ID, ld int, ip net.IP) *node {
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var r enr.Record
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r.Set(enr.IP(ip))
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r.Set(enr.UDP(30303))
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return wrapNode(enode.SignNull(&r, idAtDistance(base, ld)))
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}
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113
p2p/discover/v5_talk.go
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113
p2p/discover/v5_talk.go
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@ -0,0 +1,113 @@
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// 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 discover
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import (
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"net"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/discover/v5wire"
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"github.com/ethereum/go-ethereum/p2p/enode"
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)
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// This is a limit for the number of concurrent talk requests.
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const maxActiveTalkRequests = 1024
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// This is the timeout for acquiring a handler execution slot for a talk request.
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// The timeout should be short enough to fit within the request timeout.
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const talkHandlerLaunchTimeout = 400 * time.Millisecond
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// TalkRequestHandler callback processes a talk request and returns a response.
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//
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// Note that talk handlers are expected to come up with a response very quickly, within at
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// most 200ms or so. If the handler takes longer than that, the remote end may time out
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// and wont receive the response.
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type TalkRequestHandler func(enode.ID, *net.UDPAddr, []byte) []byte
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type talkSystem struct {
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transport *UDPv5
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mutex sync.Mutex
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handlers map[string]TalkRequestHandler
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slots chan struct{}
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lastLog time.Time
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dropCount int
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}
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func newTalkSystem(transport *UDPv5) *talkSystem {
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t := &talkSystem{
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transport: transport,
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handlers: make(map[string]TalkRequestHandler),
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slots: make(chan struct{}, maxActiveTalkRequests),
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}
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for i := 0; i < cap(t.slots); i++ {
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t.slots <- struct{}{}
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}
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return t
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}
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// register adds a protocol handler.
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func (t *talkSystem) register(protocol string, handler TalkRequestHandler) {
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t.mutex.Lock()
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t.handlers[protocol] = handler
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t.mutex.Unlock()
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}
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// handleRequest handles a talk request.
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func (t *talkSystem) handleRequest(id enode.ID, addr *net.UDPAddr, req *v5wire.TalkRequest) {
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t.mutex.Lock()
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handler, ok := t.handlers[req.Protocol]
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t.mutex.Unlock()
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if !ok {
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resp := &v5wire.TalkResponse{ReqID: req.ReqID}
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t.transport.sendResponse(id, addr, resp)
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return
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}
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// Wait for a slot to become available, then run the handler.
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timeout := time.NewTimer(talkHandlerLaunchTimeout)
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defer timeout.Stop()
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select {
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case <-t.slots:
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go func() {
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defer func() { t.slots <- struct{}{} }()
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respMessage := handler(id, addr, req.Message)
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resp := &v5wire.TalkResponse{ReqID: req.ReqID, Message: respMessage}
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t.transport.sendFromAnotherThread(id, addr, resp)
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}()
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case <-timeout.C:
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// Couldn't get it in time, drop the request.
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if time.Since(t.lastLog) > 5*time.Second {
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log.Warn("Dropping TALKREQ due to overload", "ndrop", t.dropCount)
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t.lastLog = time.Now()
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t.dropCount++
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}
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case <-t.transport.closeCtx.Done():
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// Transport closed, drop the request.
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}
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}
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// wait blocks until all active requests have finished, and prevents new request
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// handlers from being launched.
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func (t *talkSystem) wait() {
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for i := 0; i < cap(t.slots); i++ {
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<-t.slots
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}
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}
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@ -74,8 +74,7 @@ type UDPv5 struct {
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logcontext []interface{}
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// talkreq handler registry
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trlock sync.Mutex
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trhandlers map[string]TalkRequestHandler
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talk *talkSystem
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// channels into dispatch
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packetInCh chan ReadPacket
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@ -83,6 +82,7 @@ type UDPv5 struct {
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callCh chan *callV5
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callDoneCh chan *callV5
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respTimeoutCh chan *callTimeout
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sendCh chan sendRequest
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unhandled chan<- ReadPacket
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// state of dispatch
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@ -98,12 +98,18 @@ type UDPv5 struct {
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wg sync.WaitGroup
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}
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// TalkRequestHandler callback processes a talk request and optionally returns a reply
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type TalkRequestHandler func(enode.ID, *net.UDPAddr, []byte) []byte
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type sendRequest struct {
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destID enode.ID
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destAddr *net.UDPAddr
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msg v5wire.Packet
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}
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// callV5 represents a remote procedure call against another node.
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type callV5 struct {
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node *enode.Node
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id enode.ID
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addr *net.UDPAddr
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node *enode.Node // This is required to perform handshakes.
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packet v5wire.Packet
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responseType byte // expected packet type of response
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reqid []byte
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@ -150,12 +156,12 @@ func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
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log: cfg.Log,
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validSchemes: cfg.ValidSchemes,
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clock: cfg.Clock,
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trhandlers: make(map[string]TalkRequestHandler),
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// channels into dispatch
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packetInCh: make(chan ReadPacket, 1),
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readNextCh: make(chan struct{}, 1),
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callCh: make(chan *callV5),
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callDoneCh: make(chan *callV5),
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sendCh: make(chan sendRequest),
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respTimeoutCh: make(chan *callTimeout),
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unhandled: cfg.Unhandled,
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// state of dispatch
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@ -163,11 +169,11 @@ func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
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activeCallByNode: make(map[enode.ID]*callV5),
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activeCallByAuth: make(map[v5wire.Nonce]*callV5),
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callQueue: make(map[enode.ID][]*callV5),
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// shutdown
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closeCtx: closeCtx,
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cancelCloseCtx: cancelCloseCtx,
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}
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t.talk = newTalkSystem(t)
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tab, err := newTable(t, t.db, cfg.Bootnodes, cfg.Log)
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if err != nil {
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return nil, err
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@ -186,6 +192,7 @@ func (t *UDPv5) Close() {
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t.closeOnce.Do(func() {
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t.cancelCloseCtx()
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t.conn.Close()
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t.talk.wait()
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t.wg.Wait()
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t.tab.close()
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})
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@ -241,15 +248,26 @@ func (t *UDPv5) LocalNode() *enode.LocalNode {
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// whenever a request for the given protocol is received and should return the response
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// data or nil.
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func (t *UDPv5) RegisterTalkHandler(protocol string, handler TalkRequestHandler) {
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t.trlock.Lock()
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defer t.trlock.Unlock()
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t.trhandlers[protocol] = handler
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t.talk.register(protocol, handler)
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}
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// TalkRequest sends a talk request to n and waits for a response.
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// TalkRequest sends a talk request to a node and waits for a response.
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func (t *UDPv5) TalkRequest(n *enode.Node, protocol string, request []byte) ([]byte, error) {
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req := &v5wire.TalkRequest{Protocol: protocol, Message: request}
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resp := t.call(n, v5wire.TalkResponseMsg, req)
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resp := t.callToNode(n, v5wire.TalkResponseMsg, req)
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defer t.callDone(resp)
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select {
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case respMsg := <-resp.ch:
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return respMsg.(*v5wire.TalkResponse).Message, nil
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case err := <-resp.err:
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return nil, err
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}
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}
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// TalkRequest sends a talk request to a node and waits for a response.
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func (t *UDPv5) TalkRequestToID(id enode.ID, addr *net.UDPAddr, protocol string, request []byte) ([]byte, error) {
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req := &v5wire.TalkRequest{Protocol: protocol, Message: request}
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resp := t.callToID(id, addr, v5wire.TalkResponseMsg, req)
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defer t.callDone(resp)
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select {
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case respMsg := <-resp.ch:
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@ -340,7 +358,7 @@ func lookupDistances(target, dest enode.ID) (dists []uint) {
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// ping calls PING on a node and waits for a PONG response.
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func (t *UDPv5) ping(n *enode.Node) (uint64, error) {
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req := &v5wire.Ping{ENRSeq: t.localNode.Node().Seq()}
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resp := t.call(n, v5wire.PongMsg, req)
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resp := t.callToNode(n, v5wire.PongMsg, req)
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defer t.callDone(resp)
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select {
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@ -365,7 +383,7 @@ func (t *UDPv5) RequestENR(n *enode.Node) (*enode.Node, error) {
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// findnode calls FINDNODE on a node and waits for responses.
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func (t *UDPv5) findnode(n *enode.Node, distances []uint) ([]*enode.Node, error) {
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resp := t.call(n, v5wire.NodesMsg, &v5wire.Findnode{Distances: distances})
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resp := t.callToNode(n, v5wire.NodesMsg, &v5wire.Findnode{Distances: distances})
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return t.waitForNodes(resp, distances)
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}
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@ -408,17 +426,17 @@ func (t *UDPv5) verifyResponseNode(c *callV5, r *enr.Record, distances []uint, s
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if err != nil {
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return nil, err
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}
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if err := netutil.CheckRelayIP(c.node.IP(), node.IP()); err != nil {
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if err := netutil.CheckRelayIP(c.addr.IP, node.IP()); err != nil {
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return nil, err
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}
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if t.netrestrict != nil && !t.netrestrict.Contains(node.IP()) {
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return nil, errors.New("not contained in netrestrict list")
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}
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if c.node.UDP() <= 1024 {
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if node.UDP() <= 1024 {
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return nil, errLowPort
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}
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if distances != nil {
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nd := enode.LogDist(c.node.ID(), node.ID())
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nd := enode.LogDist(c.id, node.ID())
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if !containsUint(uint(nd), distances) {
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return nil, errors.New("does not match any requested distance")
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}
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@ -439,17 +457,28 @@ func containsUint(x uint, xs []uint) bool {
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return false
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}
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// call sends the given call and sets up a handler for response packets (of message type
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// responseType). Responses are dispatched to the call's response channel.
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func (t *UDPv5) call(node *enode.Node, responseType byte, packet v5wire.Packet) *callV5 {
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c := &callV5{
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node: node,
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packet: packet,
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responseType: responseType,
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reqid: make([]byte, 8),
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ch: make(chan v5wire.Packet, 1),
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err: make(chan error, 1),
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}
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// callToNode sends the given call and sets up a handler for response packets (of message
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// type responseType). Responses are dispatched to the call's response channel.
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func (t *UDPv5) callToNode(n *enode.Node, responseType byte, req v5wire.Packet) *callV5 {
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addr := &net.UDPAddr{IP: n.IP(), Port: int(n.UDP())}
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c := &callV5{id: n.ID(), addr: addr, node: n}
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t.initCall(c, responseType, req)
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return c
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}
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// callToID is like callToNode, but for cases where the node record is not available.
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func (t *UDPv5) callToID(id enode.ID, addr *net.UDPAddr, responseType byte, req v5wire.Packet) *callV5 {
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c := &callV5{id: id, addr: addr}
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t.initCall(c, responseType, req)
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return c
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}
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func (t *UDPv5) initCall(c *callV5, responseType byte, packet v5wire.Packet) {
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c.packet = packet
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c.responseType = responseType
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c.reqid = make([]byte, 8)
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c.ch = make(chan v5wire.Packet, 1)
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c.err = make(chan error, 1)
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// Assign request ID.
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crand.Read(c.reqid)
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packet.SetRequestID(c.reqid)
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@ -459,7 +488,6 @@ func (t *UDPv5) call(node *enode.Node, responseType byte, packet v5wire.Packet)
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case <-t.closeCtx.Done():
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c.err <- errClosed
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}
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return c
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}
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// callDone tells dispatch that the active call is done.
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@ -501,26 +529,27 @@ func (t *UDPv5) dispatch() {
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for {
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select {
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case c := <-t.callCh:
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id := c.node.ID()
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t.callQueue[id] = append(t.callQueue[id], c)
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t.sendNextCall(id)
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t.callQueue[c.id] = append(t.callQueue[c.id], c)
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t.sendNextCall(c.id)
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case ct := <-t.respTimeoutCh:
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active := t.activeCallByNode[ct.c.node.ID()]
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active := t.activeCallByNode[ct.c.id]
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if ct.c == active && ct.timer == active.timeout {
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ct.c.err <- errTimeout
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}
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case c := <-t.callDoneCh:
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id := c.node.ID()
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active := t.activeCallByNode[id]
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active := t.activeCallByNode[c.id]
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if active != c {
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panic("BUG: callDone for inactive call")
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}
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c.timeout.Stop()
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delete(t.activeCallByAuth, c.nonce)
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delete(t.activeCallByNode, id)
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t.sendNextCall(id)
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delete(t.activeCallByNode, c.id)
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t.sendNextCall(c.id)
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case r := <-t.sendCh:
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t.send(r.destID, r.destAddr, r.msg, nil)
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case p := <-t.packetInCh:
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t.handlePacket(p.Data, p.Addr)
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@ -590,8 +619,7 @@ func (t *UDPv5) sendCall(c *callV5) {
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delete(t.activeCallByAuth, c.nonce)
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}
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addr := &net.UDPAddr{IP: c.node.IP(), Port: c.node.UDP()}
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newNonce, _ := t.send(c.node.ID(), addr, c.packet, c.challenge)
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newNonce, _ := t.send(c.id, c.addr, c.packet, c.challenge)
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c.nonce = newNonce
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t.activeCallByAuth[newNonce] = c
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t.startResponseTimeout(c)
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@ -604,6 +632,13 @@ func (t *UDPv5) sendResponse(toID enode.ID, toAddr *net.UDPAddr, packet v5wire.P
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return err
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}
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func (t *UDPv5) sendFromAnotherThread(toID enode.ID, toAddr *net.UDPAddr, packet v5wire.Packet) {
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select {
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case t.sendCh <- sendRequest{toID, toAddr, packet}:
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case <-t.closeCtx.Done():
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}
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}
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// send sends a packet to the given node.
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func (t *UDPv5) send(toID enode.ID, toAddr *net.UDPAddr, packet v5wire.Packet, c *v5wire.Whoareyou) (v5wire.Nonce, error) {
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addr := toAddr.String()
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@ -691,7 +726,7 @@ func (t *UDPv5) handleCallResponse(fromID enode.ID, fromAddr *net.UDPAddr, p v5w
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t.log.Debug(fmt.Sprintf("Unsolicited/late %s response", p.Name()), "id", fromID, "addr", fromAddr)
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return false
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}
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if !fromAddr.IP.Equal(ac.node.IP()) || fromAddr.Port != ac.node.UDP() {
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if !fromAddr.IP.Equal(ac.addr.IP) || fromAddr.Port != ac.addr.Port {
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t.log.Debug(fmt.Sprintf("%s from wrong endpoint", p.Name()), "id", fromID, "addr", fromAddr)
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return false
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}
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@ -733,7 +768,7 @@ func (t *UDPv5) handle(p v5wire.Packet, fromID enode.ID, fromAddr *net.UDPAddr)
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case *v5wire.Nodes:
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t.handleCallResponse(fromID, fromAddr, p)
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case *v5wire.TalkRequest:
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t.handleTalkRequest(fromID, fromAddr, p)
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t.talk.handleRequest(fromID, fromAddr, p)
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case *v5wire.TalkResponse:
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t.handleCallResponse(fromID, fromAddr, p)
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}
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@ -763,6 +798,12 @@ func (t *UDPv5) handleWhoareyou(p *v5wire.Whoareyou, fromID enode.ID, fromAddr *
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return
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}
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if c.node == nil {
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// Can't perform handshake because we don't have the ENR.
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t.log.Debug("Can't handle "+p.Name(), "addr", fromAddr, "err", "call has no ENR")
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c.err <- errors.New("remote wants handshake, but call has no ENR")
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return
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}
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// Resend the call that was answered by WHOAREYOU.
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t.log.Trace("<< "+p.Name(), "id", c.node.ID(), "addr", fromAddr)
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c.handshakeCount++
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@ -876,17 +917,3 @@ func packNodes(reqid []byte, nodes []*enode.Node) []*v5wire.Nodes {
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}
|
||||
return resp
|
||||
}
|
||||
|
||||
// handleTalkRequest runs the talk request handler of the requested protocol.
|
||||
func (t *UDPv5) handleTalkRequest(fromID enode.ID, fromAddr *net.UDPAddr, p *v5wire.TalkRequest) {
|
||||
t.trlock.Lock()
|
||||
handler := t.trhandlers[p.Protocol]
|
||||
t.trlock.Unlock()
|
||||
|
||||
var response []byte
|
||||
if handler != nil {
|
||||
response = handler(fromID, fromAddr, p.Message)
|
||||
}
|
||||
resp := &v5wire.TalkResponse{ReqID: p.ReqID, Message: response}
|
||||
t.sendResponse(fromID, fromAddr, resp)
|
||||
}
|
||||
|
@ -186,7 +186,7 @@ func TestUDPv5_findnodeHandling(t *testing.T) {
|
||||
|
||||
// This request gets all the distance-253 nodes.
|
||||
test.packetIn(&v5wire.Findnode{ReqID: []byte{4}, Distances: []uint{253}})
|
||||
test.expectNodes([]byte{4}, 1, nodes253)
|
||||
test.expectNodes([]byte{4}, 2, nodes253)
|
||||
|
||||
// This request gets all the distance-249 nodes and some more at 248 because
|
||||
// the bucket at 249 is not full.
|
||||
@ -515,6 +515,27 @@ func TestUDPv5_talkRequest(t *testing.T) {
|
||||
if err := <-done; err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// Also check requesting without ENR.
|
||||
go func() {
|
||||
_, err := test.udp.TalkRequestToID(remote.ID(), test.remoteaddr, "test", []byte("test request 2"))
|
||||
done <- err
|
||||
}()
|
||||
test.waitPacketOut(func(p *v5wire.TalkRequest, addr *net.UDPAddr, _ v5wire.Nonce) {
|
||||
if p.Protocol != "test" {
|
||||
t.Errorf("wrong protocol ID in talk request: %q", p.Protocol)
|
||||
}
|
||||
if string(p.Message) != "test request 2" {
|
||||
t.Errorf("wrong message talk request: %q", p.Message)
|
||||
}
|
||||
test.packetInFrom(test.remotekey, test.remoteaddr, &v5wire.TalkResponse{
|
||||
ReqID: p.ReqID,
|
||||
Message: []byte("test response 2"),
|
||||
})
|
||||
})
|
||||
if err := <-done; err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
// This test checks that lookupDistances works.
|
||||
|
@ -216,7 +216,7 @@ func (p *TalkRequest) RequestID() []byte { return p.ReqID }
|
||||
func (p *TalkRequest) SetRequestID(id []byte) { p.ReqID = id }
|
||||
|
||||
func (p *TalkRequest) AppendLogInfo(ctx []interface{}) []interface{} {
|
||||
return append(ctx, "proto", p.Protocol, "reqid", hexutil.Bytes(p.ReqID), "len", len(p.Message))
|
||||
return append(ctx, "proto", p.Protocol, "req", hexutil.Bytes(p.ReqID), "len", len(p.Message))
|
||||
}
|
||||
|
||||
func (*TalkResponse) Name() string { return "TALKRESP/v5" }
|
||||
@ -225,5 +225,5 @@ func (p *TalkResponse) RequestID() []byte { return p.ReqID }
|
||||
func (p *TalkResponse) SetRequestID(id []byte) { p.ReqID = id }
|
||||
|
||||
func (p *TalkResponse) AppendLogInfo(ctx []interface{}) []interface{} {
|
||||
return append(ctx, "req", p.ReqID, "len", len(p.Message))
|
||||
return append(ctx, "req", hexutil.Bytes(p.ReqID), "len", len(p.Message))
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user