668 lines
20 KiB
Go
668 lines
20 KiB
Go
// Copyright 2015 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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"bytes"
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"crypto/ecdsa"
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crand "crypto/rand"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"math/rand"
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"net"
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"reflect"
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"sync"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/internal/testlog"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/discover/v4wire"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/enr"
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)
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// shared test variables
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var (
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futureExp = uint64(time.Now().Add(10 * time.Hour).Unix())
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testTarget = v4wire.Pubkey{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}
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testRemote = v4wire.Endpoint{IP: net.ParseIP("1.1.1.1").To4(), UDP: 1, TCP: 2}
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testLocalAnnounced = v4wire.Endpoint{IP: net.ParseIP("2.2.2.2").To4(), UDP: 3, TCP: 4}
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testLocal = v4wire.Endpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6}
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)
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type udpTest struct {
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t *testing.T
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pipe *dgramPipe
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table *Table
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db *enode.DB
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udp *UDPv4
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sent [][]byte
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localkey, remotekey *ecdsa.PrivateKey
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remoteaddr *net.UDPAddr
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}
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func newUDPTest(t *testing.T) *udpTest {
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test := &udpTest{
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t: t,
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pipe: newpipe(),
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localkey: newkey(),
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remotekey: newkey(),
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remoteaddr: &net.UDPAddr{IP: net.IP{10, 0, 1, 99}, Port: 30303},
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}
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test.db, _ = enode.OpenDB("")
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ln := enode.NewLocalNode(test.db, test.localkey)
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test.udp, _ = ListenV4(test.pipe, ln, Config{
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PrivateKey: test.localkey,
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Log: testlog.Logger(t, log.LvlTrace),
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})
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test.table = test.udp.tab
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// Wait for initial refresh so the table doesn't send unexpected findnode.
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<-test.table.initDone
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return test
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}
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func (test *udpTest) close() {
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test.udp.Close()
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test.db.Close()
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}
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// handles a packet as if it had been sent to the transport.
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func (test *udpTest) packetIn(wantError error, data v4wire.Packet) {
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test.t.Helper()
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test.packetInFrom(wantError, test.remotekey, test.remoteaddr, data)
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}
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// handles a packet as if it had been sent to the transport by the key/endpoint.
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func (test *udpTest) packetInFrom(wantError error, key *ecdsa.PrivateKey, addr *net.UDPAddr, data v4wire.Packet) {
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test.t.Helper()
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enc, _, err := v4wire.Encode(key, data)
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if err != nil {
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test.t.Errorf("%s encode error: %v", data.Name(), err)
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}
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test.sent = append(test.sent, enc)
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if err = test.udp.handlePacket(addr, enc); err != wantError {
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test.t.Errorf("error mismatch: got %q, want %q", err, wantError)
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}
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}
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// waits for a packet to be sent by the transport.
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// validate should have type func(X, *net.UDPAddr, []byte), where X is a packet type.
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func (test *udpTest) waitPacketOut(validate interface{}) (closed bool) {
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test.t.Helper()
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dgram, err := test.pipe.receive()
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if err == errClosed {
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return true
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} else if err != nil {
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test.t.Error("packet receive error:", err)
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return false
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}
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p, _, hash, err := v4wire.Decode(dgram.data)
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if err != nil {
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test.t.Errorf("sent packet decode error: %v", err)
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return false
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}
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fn := reflect.ValueOf(validate)
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exptype := fn.Type().In(0)
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if !reflect.TypeOf(p).AssignableTo(exptype) {
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test.t.Errorf("sent packet type mismatch, got: %v, want: %v", reflect.TypeOf(p), exptype)
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return false
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}
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fn.Call([]reflect.Value{reflect.ValueOf(p), reflect.ValueOf(&dgram.to), reflect.ValueOf(hash)})
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return false
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}
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func TestUDPv4_packetErrors(t *testing.T) {
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test := newUDPTest(t)
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defer test.close()
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test.packetIn(errExpired, &v4wire.Ping{From: testRemote, To: testLocalAnnounced, Version: 4})
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test.packetIn(errUnsolicitedReply, &v4wire.Pong{ReplyTok: []byte{}, Expiration: futureExp})
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test.packetIn(errUnknownNode, &v4wire.Findnode{Expiration: futureExp})
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test.packetIn(errUnsolicitedReply, &v4wire.Neighbors{Expiration: futureExp})
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}
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func TestUDPv4_pingTimeout(t *testing.T) {
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t.Parallel()
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test := newUDPTest(t)
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defer test.close()
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key := newkey()
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toaddr := &net.UDPAddr{IP: net.ParseIP("1.2.3.4"), Port: 2222}
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node := enode.NewV4(&key.PublicKey, toaddr.IP, 0, toaddr.Port)
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if _, err := test.udp.ping(node); err != errTimeout {
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t.Error("expected timeout error, got", err)
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}
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}
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type testPacket byte
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func (req testPacket) Kind() byte { return byte(req) }
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func (req testPacket) Name() string { return "" }
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func TestUDPv4_responseTimeouts(t *testing.T) {
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t.Parallel()
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test := newUDPTest(t)
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defer test.close()
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rand.Seed(time.Now().UnixNano())
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randomDuration := func(max time.Duration) time.Duration {
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return time.Duration(rand.Int63n(int64(max)))
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}
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var (
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nReqs = 200
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nTimeouts = 0 // number of requests with ptype > 128
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nilErr = make(chan error, nReqs) // for requests that get a reply
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timeoutErr = make(chan error, nReqs) // for requests that time out
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)
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for i := 0; i < nReqs; i++ {
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// Create a matcher for a random request in udp.loop. Requests
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// with ptype <= 128 will not get a reply and should time out.
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// For all other requests, a reply is scheduled to arrive
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// within the timeout window.
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p := &replyMatcher{
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ptype: byte(rand.Intn(255)),
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callback: func(v4wire.Packet) (bool, bool) { return true, true },
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}
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binary.BigEndian.PutUint64(p.from[:], uint64(i))
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if p.ptype <= 128 {
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p.errc = timeoutErr
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test.udp.addReplyMatcher <- p
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nTimeouts++
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} else {
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p.errc = nilErr
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test.udp.addReplyMatcher <- p
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time.AfterFunc(randomDuration(60*time.Millisecond), func() {
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if !test.udp.handleReply(p.from, p.ip, testPacket(p.ptype)) {
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t.Logf("not matched: %v", p)
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}
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})
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}
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time.Sleep(randomDuration(30 * time.Millisecond))
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}
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// Check that all timeouts were delivered and that the rest got nil errors.
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// The replies must be delivered.
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var (
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recvDeadline = time.After(20 * time.Second)
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nTimeoutsRecv, nNil = 0, 0
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)
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for i := 0; i < nReqs; i++ {
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select {
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case err := <-timeoutErr:
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if err != errTimeout {
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t.Fatalf("got non-timeout error on timeoutErr %d: %v", i, err)
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}
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nTimeoutsRecv++
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case err := <-nilErr:
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if err != nil {
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t.Fatalf("got non-nil error on nilErr %d: %v", i, err)
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}
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nNil++
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case <-recvDeadline:
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t.Fatalf("exceeded recv deadline")
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}
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}
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if nTimeoutsRecv != nTimeouts {
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t.Errorf("wrong number of timeout errors received: got %d, want %d", nTimeoutsRecv, nTimeouts)
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}
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if nNil != nReqs-nTimeouts {
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t.Errorf("wrong number of successful replies: got %d, want %d", nNil, nReqs-nTimeouts)
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}
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}
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func TestUDPv4_findnodeTimeout(t *testing.T) {
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t.Parallel()
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test := newUDPTest(t)
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defer test.close()
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toaddr := &net.UDPAddr{IP: net.ParseIP("1.2.3.4"), Port: 2222}
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toid := enode.ID{1, 2, 3, 4}
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target := v4wire.Pubkey{4, 5, 6, 7}
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result, err := test.udp.findnode(toid, toaddr, target)
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if err != errTimeout {
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t.Error("expected timeout error, got", err)
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}
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if len(result) > 0 {
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t.Error("expected empty result, got", result)
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}
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}
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func TestUDPv4_findnode(t *testing.T) {
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test := newUDPTest(t)
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defer test.close()
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// put a few nodes into the table. their exact
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// distribution shouldn't matter much, although we need to
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// take care not to overflow any bucket.
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nodes := &nodesByDistance{target: testTarget.ID()}
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live := make(map[enode.ID]bool)
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numCandidates := 2 * bucketSize
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for i := 0; i < numCandidates; i++ {
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key := newkey()
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ip := net.IP{10, 13, 0, byte(i)}
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n := wrapNode(enode.NewV4(&key.PublicKey, ip, 0, 2000))
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// Ensure half of table content isn't verified live yet.
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if i > numCandidates/2 {
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n.livenessChecks = 1
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live[n.ID()] = true
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}
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nodes.push(n, numCandidates)
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}
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fillTable(test.table, nodes.entries)
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// ensure there's a bond with the test node,
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// findnode won't be accepted otherwise.
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remoteID := v4wire.EncodePubkey(&test.remotekey.PublicKey).ID()
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test.table.db.UpdateLastPongReceived(remoteID, test.remoteaddr.IP, time.Now())
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// check that closest neighbors are returned.
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expected := test.table.findnodeByID(testTarget.ID(), bucketSize, true)
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test.packetIn(nil, &v4wire.Findnode{Target: testTarget, Expiration: futureExp})
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waitNeighbors := func(want []*node) {
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test.waitPacketOut(func(p *v4wire.Neighbors, to *net.UDPAddr, hash []byte) {
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if len(p.Nodes) != len(want) {
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t.Errorf("wrong number of results: got %d, want %d", len(p.Nodes), bucketSize)
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return
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}
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for i, n := range p.Nodes {
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if n.ID.ID() != want[i].ID() {
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t.Errorf("result mismatch at %d:\n got: %v\n want: %v", i, n, expected.entries[i])
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}
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if !live[n.ID.ID()] {
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t.Errorf("result includes dead node %v", n.ID.ID())
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}
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}
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})
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}
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// Receive replies.
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want := expected.entries
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if len(want) > v4wire.MaxNeighbors {
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waitNeighbors(want[:v4wire.MaxNeighbors])
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want = want[v4wire.MaxNeighbors:]
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}
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waitNeighbors(want)
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}
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func TestUDPv4_findnodeMultiReply(t *testing.T) {
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test := newUDPTest(t)
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defer test.close()
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rid := enode.PubkeyToIDV4(&test.remotekey.PublicKey)
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test.table.db.UpdateLastPingReceived(rid, test.remoteaddr.IP, time.Now())
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// queue a pending findnode request
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resultc, errc := make(chan []*node, 1), make(chan error, 1)
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go func() {
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rid := encodePubkey(&test.remotekey.PublicKey).id()
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ns, err := test.udp.findnode(rid, test.remoteaddr, testTarget)
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if err != nil && len(ns) == 0 {
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errc <- err
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} else {
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resultc <- ns
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}
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}()
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// wait for the findnode to be sent.
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// after it is sent, the transport is waiting for a reply
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test.waitPacketOut(func(p *v4wire.Findnode, to *net.UDPAddr, hash []byte) {
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if p.Target != testTarget {
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t.Errorf("wrong target: got %v, want %v", p.Target, testTarget)
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}
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})
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// send the reply as two packets.
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list := []*node{
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wrapNode(enode.MustParse("enode://ba85011c70bcc5c04d8607d3a0ed29aa6179c092cbdda10d5d32684fb33ed01bd94f588ca8f91ac48318087dcb02eaf36773a7a453f0eedd6742af668097b29c@10.0.1.16:30303?discport=30304")),
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wrapNode(enode.MustParse("enode://81fa361d25f157cd421c60dcc28d8dac5ef6a89476633339c5df30287474520caca09627da18543d9079b5b288698b542d56167aa5c09111e55acdbbdf2ef799@10.0.1.16:30303")),
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wrapNode(enode.MustParse("enode://9bffefd833d53fac8e652415f4973bee289e8b1a5c6c4cbe70abf817ce8a64cee11b823b66a987f51aaa9fba0d6a91b3e6bf0d5a5d1042de8e9eeea057b217f8@10.0.1.36:30301?discport=17")),
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wrapNode(enode.MustParse("enode://1b5b4aa662d7cb44a7221bfba67302590b643028197a7d5214790f3bac7aaa4a3241be9e83c09cf1f6c69d007c634faae3dc1b1221793e8446c0b3a09de65960@10.0.1.16:30303")),
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}
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rpclist := make([]v4wire.Node, len(list))
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for i := range list {
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rpclist[i] = nodeToRPC(list[i])
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}
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test.packetIn(nil, &v4wire.Neighbors{Expiration: futureExp, Nodes: rpclist[:2]})
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test.packetIn(nil, &v4wire.Neighbors{Expiration: futureExp, Nodes: rpclist[2:]})
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// check that the sent neighbors are all returned by findnode
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select {
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case result := <-resultc:
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want := append(list[:2], list[3:]...)
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if !reflect.DeepEqual(result, want) {
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t.Errorf("neighbors mismatch:\n got: %v\n want: %v", result, want)
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}
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case err := <-errc:
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t.Errorf("findnode error: %v", err)
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case <-time.After(5 * time.Second):
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t.Error("findnode did not return within 5 seconds")
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}
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}
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// This test checks that reply matching of pong verifies the ping hash.
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func TestUDPv4_pingMatch(t *testing.T) {
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test := newUDPTest(t)
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defer test.close()
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randToken := make([]byte, 32)
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crand.Read(randToken)
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test.packetIn(nil, &v4wire.Ping{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
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test.waitPacketOut(func(*v4wire.Pong, *net.UDPAddr, []byte) {})
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test.waitPacketOut(func(*v4wire.Ping, *net.UDPAddr, []byte) {})
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test.packetIn(errUnsolicitedReply, &v4wire.Pong{ReplyTok: randToken, To: testLocalAnnounced, Expiration: futureExp})
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}
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// This test checks that reply matching of pong verifies the sender IP address.
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func TestUDPv4_pingMatchIP(t *testing.T) {
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test := newUDPTest(t)
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defer test.close()
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test.packetIn(nil, &v4wire.Ping{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
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test.waitPacketOut(func(*v4wire.Pong, *net.UDPAddr, []byte) {})
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test.waitPacketOut(func(p *v4wire.Ping, to *net.UDPAddr, hash []byte) {
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wrongAddr := &net.UDPAddr{IP: net.IP{33, 44, 1, 2}, Port: 30000}
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test.packetInFrom(errUnsolicitedReply, test.remotekey, wrongAddr, &v4wire.Pong{
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ReplyTok: hash,
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To: testLocalAnnounced,
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Expiration: futureExp,
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})
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})
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}
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func TestUDPv4_successfulPing(t *testing.T) {
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test := newUDPTest(t)
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added := make(chan *node, 1)
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test.table.nodeAddedHook = func(n *node) { added <- n }
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defer test.close()
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// The remote side sends a ping packet to initiate the exchange.
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go test.packetIn(nil, &v4wire.Ping{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
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// The ping is replied to.
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test.waitPacketOut(func(p *v4wire.Pong, to *net.UDPAddr, hash []byte) {
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pinghash := test.sent[0][:32]
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if !bytes.Equal(p.ReplyTok, pinghash) {
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t.Errorf("got pong.ReplyTok %x, want %x", p.ReplyTok, pinghash)
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}
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wantTo := v4wire.Endpoint{
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// The mirrored UDP address is the UDP packet sender
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IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
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// The mirrored TCP port is the one from the ping packet
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TCP: testRemote.TCP,
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}
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if !reflect.DeepEqual(p.To, wantTo) {
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t.Errorf("got pong.To %v, want %v", p.To, wantTo)
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}
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})
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// Remote is unknown, the table pings back.
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test.waitPacketOut(func(p *v4wire.Ping, to *net.UDPAddr, hash []byte) {
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if !reflect.DeepEqual(p.From, test.udp.ourEndpoint()) {
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t.Errorf("got ping.From %#v, want %#v", p.From, test.udp.ourEndpoint())
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}
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wantTo := v4wire.Endpoint{
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// The mirrored UDP address is the UDP packet sender.
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IP: test.remoteaddr.IP,
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UDP: uint16(test.remoteaddr.Port),
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TCP: 0,
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}
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if !reflect.DeepEqual(p.To, wantTo) {
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t.Errorf("got ping.To %v, want %v", p.To, wantTo)
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|
}
|
|
test.packetIn(nil, &v4wire.Pong{ReplyTok: hash, Expiration: futureExp})
|
|
})
|
|
|
|
// The node should be added to the table shortly after getting the
|
|
// pong packet.
|
|
select {
|
|
case n := <-added:
|
|
rid := encodePubkey(&test.remotekey.PublicKey).id()
|
|
if n.ID() != rid {
|
|
t.Errorf("node has wrong ID: got %v, want %v", n.ID(), rid)
|
|
}
|
|
if !n.IP().Equal(test.remoteaddr.IP) {
|
|
t.Errorf("node has wrong IP: got %v, want: %v", n.IP(), test.remoteaddr.IP)
|
|
}
|
|
if n.UDP() != test.remoteaddr.Port {
|
|
t.Errorf("node has wrong UDP port: got %v, want: %v", n.UDP(), test.remoteaddr.Port)
|
|
}
|
|
if n.TCP() != int(testRemote.TCP) {
|
|
t.Errorf("node has wrong TCP port: got %v, want: %v", n.TCP(), testRemote.TCP)
|
|
}
|
|
case <-time.After(2 * time.Second):
|
|
t.Errorf("node was not added within 2 seconds")
|
|
}
|
|
}
|
|
|
|
// This test checks that EIP-868 requests work.
|
|
func TestUDPv4_EIP868(t *testing.T) {
|
|
test := newUDPTest(t)
|
|
defer test.close()
|
|
|
|
test.udp.localNode.Set(enr.WithEntry("foo", "bar"))
|
|
wantNode := test.udp.localNode.Node()
|
|
|
|
// ENR requests aren't allowed before endpoint proof.
|
|
test.packetIn(errUnknownNode, &v4wire.ENRRequest{Expiration: futureExp})
|
|
|
|
// Perform endpoint proof and check for sequence number in packet tail.
|
|
test.packetIn(nil, &v4wire.Ping{Expiration: futureExp})
|
|
test.waitPacketOut(func(p *v4wire.Pong, addr *net.UDPAddr, hash []byte) {
|
|
if p.ENRSeq != wantNode.Seq() {
|
|
t.Errorf("wrong sequence number in pong: %d, want %d", p.ENRSeq, wantNode.Seq())
|
|
}
|
|
})
|
|
test.waitPacketOut(func(p *v4wire.Ping, addr *net.UDPAddr, hash []byte) {
|
|
if p.ENRSeq != wantNode.Seq() {
|
|
t.Errorf("wrong sequence number in ping: %d, want %d", p.ENRSeq, wantNode.Seq())
|
|
}
|
|
test.packetIn(nil, &v4wire.Pong{Expiration: futureExp, ReplyTok: hash})
|
|
})
|
|
|
|
// Request should work now.
|
|
test.packetIn(nil, &v4wire.ENRRequest{Expiration: futureExp})
|
|
test.waitPacketOut(func(p *v4wire.ENRResponse, addr *net.UDPAddr, hash []byte) {
|
|
n, err := enode.New(enode.ValidSchemes, &p.Record)
|
|
if err != nil {
|
|
t.Fatalf("invalid record: %v", err)
|
|
}
|
|
if !reflect.DeepEqual(n, wantNode) {
|
|
t.Fatalf("wrong node in ENRResponse: %v", n)
|
|
}
|
|
})
|
|
}
|
|
|
|
// This test verifies that a small network of nodes can boot up into a healthy state.
|
|
func TestUDPv4_smallNetConvergence(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
// Start the network.
|
|
nodes := make([]*UDPv4, 4)
|
|
for i := range nodes {
|
|
var cfg Config
|
|
if i > 0 {
|
|
bn := nodes[0].Self()
|
|
cfg.Bootnodes = []*enode.Node{bn}
|
|
}
|
|
nodes[i] = startLocalhostV4(t, cfg)
|
|
defer nodes[i].Close()
|
|
}
|
|
|
|
// Run through the iterator on all nodes until
|
|
// they have all found each other.
|
|
status := make(chan error, len(nodes))
|
|
for i := range nodes {
|
|
node := nodes[i]
|
|
go func() {
|
|
found := make(map[enode.ID]bool, len(nodes))
|
|
it := node.RandomNodes()
|
|
for it.Next() {
|
|
found[it.Node().ID()] = true
|
|
if len(found) == len(nodes) {
|
|
status <- nil
|
|
return
|
|
}
|
|
}
|
|
status <- fmt.Errorf("node %s didn't find all nodes", node.Self().ID().TerminalString())
|
|
}()
|
|
}
|
|
|
|
// Wait for all status reports.
|
|
timeout := time.NewTimer(30 * time.Second)
|
|
defer timeout.Stop()
|
|
for received := 0; received < len(nodes); {
|
|
select {
|
|
case <-timeout.C:
|
|
for _, node := range nodes {
|
|
node.Close()
|
|
}
|
|
case err := <-status:
|
|
received++
|
|
if err != nil {
|
|
t.Error("ERROR:", err)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func startLocalhostV4(t *testing.T, cfg Config) *UDPv4 {
|
|
t.Helper()
|
|
|
|
cfg.PrivateKey = newkey()
|
|
db, _ := enode.OpenDB("")
|
|
ln := enode.NewLocalNode(db, cfg.PrivateKey)
|
|
|
|
// Prefix logs with node ID.
|
|
lprefix := fmt.Sprintf("(%s)", ln.ID().TerminalString())
|
|
lfmt := log.TerminalFormat(false)
|
|
cfg.Log = testlog.Logger(t, log.LvlTrace)
|
|
cfg.Log.SetHandler(log.FuncHandler(func(r *log.Record) error {
|
|
t.Logf("%s %s", lprefix, lfmt.Format(r))
|
|
return nil
|
|
}))
|
|
|
|
// Listen.
|
|
socket, err := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IP{127, 0, 0, 1}})
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
realaddr := socket.LocalAddr().(*net.UDPAddr)
|
|
ln.SetStaticIP(realaddr.IP)
|
|
ln.SetFallbackUDP(realaddr.Port)
|
|
udp, err := ListenV4(socket, ln, cfg)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
return udp
|
|
}
|
|
|
|
// dgramPipe is a fake UDP socket. It queues all sent datagrams.
|
|
type dgramPipe struct {
|
|
mu *sync.Mutex
|
|
cond *sync.Cond
|
|
closing chan struct{}
|
|
closed bool
|
|
queue []dgram
|
|
}
|
|
|
|
type dgram struct {
|
|
to net.UDPAddr
|
|
data []byte
|
|
}
|
|
|
|
func newpipe() *dgramPipe {
|
|
mu := new(sync.Mutex)
|
|
return &dgramPipe{
|
|
closing: make(chan struct{}),
|
|
cond: &sync.Cond{L: mu},
|
|
mu: mu,
|
|
}
|
|
}
|
|
|
|
// WriteToUDP queues a datagram.
|
|
func (c *dgramPipe) WriteToUDP(b []byte, to *net.UDPAddr) (n int, err error) {
|
|
msg := make([]byte, len(b))
|
|
copy(msg, b)
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if c.closed {
|
|
return 0, errors.New("closed")
|
|
}
|
|
c.queue = append(c.queue, dgram{*to, b})
|
|
c.cond.Signal()
|
|
return len(b), nil
|
|
}
|
|
|
|
// ReadFromUDP just hangs until the pipe is closed.
|
|
func (c *dgramPipe) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
|
|
<-c.closing
|
|
return 0, nil, io.EOF
|
|
}
|
|
|
|
func (c *dgramPipe) Close() error {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
if !c.closed {
|
|
close(c.closing)
|
|
c.closed = true
|
|
}
|
|
c.cond.Broadcast()
|
|
return nil
|
|
}
|
|
|
|
func (c *dgramPipe) LocalAddr() net.Addr {
|
|
return &net.UDPAddr{IP: testLocal.IP, Port: int(testLocal.UDP)}
|
|
}
|
|
|
|
func (c *dgramPipe) receive() (dgram, error) {
|
|
c.mu.Lock()
|
|
defer c.mu.Unlock()
|
|
|
|
var timedOut bool
|
|
timer := time.AfterFunc(3*time.Second, func() {
|
|
c.mu.Lock()
|
|
timedOut = true
|
|
c.mu.Unlock()
|
|
c.cond.Broadcast()
|
|
})
|
|
defer timer.Stop()
|
|
|
|
for len(c.queue) == 0 && !c.closed && !timedOut {
|
|
c.cond.Wait()
|
|
}
|
|
if c.closed {
|
|
return dgram{}, errClosed
|
|
}
|
|
if timedOut {
|
|
return dgram{}, errTimeout
|
|
}
|
|
p := c.queue[0]
|
|
copy(c.queue, c.queue[1:])
|
|
c.queue = c.queue[:len(c.queue)-1]
|
|
return p, nil
|
|
}
|