forked from libp2p/go-libp2p-kad-dht
/
dht_net.go
207 lines (179 loc) · 5.57 KB
/
dht_net.go
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package dht
import (
"bufio"
"fmt"
"io"
"sync"
"time"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-msgio/protoio"
"github.com/libp2p/go-libp2p-kad-dht/metrics"
pb "github.com/libp2p/go-libp2p-kad-dht/pb"
"github.com/libp2p/go-msgio"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
"go.uber.org/zap"
)
var dhtReadMessageTimeout = 10 * time.Second
var dhtStreamIdleTimeout = 1 * time.Minute
// ErrReadTimeout is an error that occurs when no message is read within the timeout period.
var ErrReadTimeout = fmt.Errorf("timed out reading response")
// The Protobuf writer performs multiple small writes when writing a message.
// We need to buffer those writes, to make sure that we're not sending a new
// packet for every single write.
type bufferedDelimitedWriter struct {
*bufio.Writer
protoio.WriteCloser
}
var writerPool = sync.Pool{
New: func() interface{} {
w := bufio.NewWriter(nil)
return &bufferedDelimitedWriter{
Writer: w,
WriteCloser: protoio.NewDelimitedWriter(w),
}
},
}
func writeMsg(w io.Writer, mes *pb.Message) error {
bw := writerPool.Get().(*bufferedDelimitedWriter)
bw.Reset(w)
err := bw.WriteMsg(mes)
if err == nil {
err = bw.Flush()
}
bw.Reset(nil)
writerPool.Put(bw)
return err
}
func (w *bufferedDelimitedWriter) Flush() error {
return w.Writer.Flush()
}
// handleNewStream implements the network.StreamHandler
func (dht *IpfsDHT) handleNewStream(s network.Stream) {
if dht.handleNewMessage(s) {
// If we exited without error, close gracefully.
_ = s.Close()
} else {
// otherwise, send an error.
_ = s.Reset()
}
}
// Returns true on orderly completion of writes (so we can Close the stream).
func (dht *IpfsDHT) handleNewMessage(s network.Stream) bool {
ctx := dht.ctx
r := msgio.NewVarintReaderSize(s, network.MessageSizeMax)
mPeer := s.Conn().RemotePeer()
timer := time.AfterFunc(dhtStreamIdleTimeout, func() { _ = s.Reset() })
defer timer.Stop()
for {
if dht.getMode() != modeServer {
logger.Errorf("ignoring incoming dht message while not in server mode")
return false
}
var req pb.Message
msgbytes, err := r.ReadMsg()
msgLen := len(msgbytes)
if err != nil {
r.ReleaseMsg(msgbytes)
if err == io.EOF {
return true
}
// This string test is necessary because there isn't a single stream reset error
// instance in use.
if c := baseLogger.Check(zap.DebugLevel, "error reading message"); c != nil && err.Error() != "stream reset" {
c.Write(zap.String("from", mPeer.String()),
zap.Error(err))
}
if msgLen > 0 {
_ = stats.RecordWithTags(ctx,
[]tag.Mutator{tag.Upsert(metrics.KeyMessageType, "UNKNOWN")},
metrics.ReceivedMessages.M(1),
metrics.ReceivedMessageErrors.M(1),
metrics.ReceivedBytes.M(int64(msgLen)),
)
}
return false
}
err = req.Unmarshal(msgbytes)
r.ReleaseMsg(msgbytes)
if err != nil {
if c := baseLogger.Check(zap.DebugLevel, "error unmarshaling message"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Error(err))
}
_ = stats.RecordWithTags(ctx,
[]tag.Mutator{tag.Upsert(metrics.KeyMessageType, "UNKNOWN")},
metrics.ReceivedMessages.M(1),
metrics.ReceivedMessageErrors.M(1),
metrics.ReceivedBytes.M(int64(msgLen)),
)
return false
}
timer.Reset(dhtStreamIdleTimeout)
startTime := time.Now()
ctx, _ := tag.New(ctx,
tag.Upsert(metrics.KeyMessageType, req.GetType().String()),
)
stats.Record(ctx,
metrics.ReceivedMessages.M(1),
metrics.ReceivedBytes.M(int64(msgLen)),
)
handler := dht.handlerForMsgType(req.GetType())
if handler == nil {
stats.Record(ctx, metrics.ReceivedMessageErrors.M(1))
if c := baseLogger.Check(zap.DebugLevel, "can't handle received message"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Int32("type", int32(req.GetType())))
}
return false
}
// a peer has queried us, let's add it to RT
dht.peerFound(dht.ctx, mPeer, true)
if c := baseLogger.Check(zap.DebugLevel, "handling message"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Int32("type", int32(req.GetType())),
zap.Binary("key", req.GetKey()))
}
resp, err := handler(ctx, mPeer, &req)
if err != nil {
stats.Record(ctx, metrics.ReceivedMessageErrors.M(1))
if c := baseLogger.Check(zap.DebugLevel, "error handling message"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Int32("type", int32(req.GetType())),
zap.Binary("key", req.GetKey()),
zap.Error(err))
}
return false
}
if c := baseLogger.Check(zap.DebugLevel, "handled message"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Int32("type", int32(req.GetType())),
zap.Binary("key", req.GetKey()),
zap.Duration("time", time.Since(startTime)))
}
if resp == nil {
continue
}
// send out response msg
err = writeMsg(s, resp)
if err != nil {
stats.Record(ctx, metrics.ReceivedMessageErrors.M(1))
if c := baseLogger.Check(zap.DebugLevel, "error writing response"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Int32("type", int32(req.GetType())),
zap.Binary("key", req.GetKey()),
zap.Error(err))
}
return false
}
elapsedTime := time.Since(startTime)
if c := baseLogger.Check(zap.DebugLevel, "responded to message"); c != nil {
c.Write(zap.String("from", mPeer.String()),
zap.Int32("type", int32(req.GetType())),
zap.Binary("key", req.GetKey()),
zap.Duration("time", elapsedTime))
}
latencyMillis := float64(elapsedTime) / float64(time.Millisecond)
stats.Record(ctx, metrics.InboundRequestLatency.M(latencyMillis))
}
}