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messagesender.go
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messagesender.go
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package service
import (
"context"
"fmt"
inet "gx/ipfs/QmY3ArotKMKaL7YGfbQfyDrib6RVraLqZYWXZvVgZktBxp/go-libp2p-net"
"gx/ipfs/QmYVXrKrKHDC9FobgmcmshCDyWwdrfwfanNQN4oxJ9Fk3h/go-libp2p-peer"
ggio "gx/ipfs/QmddjPSGZb3ieihSseFeCfVRpZzcqczPNsD2DvarSwnjJB/gogo-protobuf/io"
"math/rand"
"sync"
"time"
"github.com/OpenBazaar/openbazaar-go/ipfs"
"github.com/OpenBazaar/openbazaar-go/pb"
)
type messageSender struct {
s inet.Stream
w ggio.WriteCloser
r ggio.ReadCloser
lk sync.Mutex
p peer.ID
service *OpenBazaarService
singleMes int
invalid bool
requests map[int32]chan *pb.Message
requestlk sync.Mutex
}
var ReadMessageTimeout = time.Minute * 5
var ErrReadTimeout = fmt.Errorf("timed out reading response")
var ErrWriteTimeout = fmt.Errorf("timed out writing message")
func (service *OpenBazaarService) messageSenderForPeer(ctx context.Context, p peer.ID) (*messageSender, error) {
service.senderlk.Lock()
ms, ok := service.sender[p]
if ok {
log.Debugf("Found existing message sender for: %s", p.Pretty())
service.senderlk.Unlock()
return ms, nil
}
log.Debugf("Creating new message sender for: %s", p.Pretty())
ms = &messageSender{p: p, service: service, requests: make(map[int32]chan *pb.Message, 2)}
service.sender[p] = ms
service.senderlk.Unlock()
if err := ms.ctxPrepOrInvalidate(ctx); err != nil {
log.Debugf("Locking sender for: %s", p.Pretty())
service.senderlk.Lock()
defer service.senderlk.Unlock()
if msCur, ok := service.sender[p]; ok {
// Changed. Use the new one, old one is invalid and
// not in the map so we can just throw it away.
if ms != msCur {
return msCur, nil
}
// Not changed, remove the now invalid stream from the
// map.
delete(service.sender, p)
}
// Invalid but not in map. Must have been removed by a disconnect.
return nil, err
}
// All ready to go.
log.Debugf("Stream opened for: %s", p.Pretty())
return ms, nil
}
// invalidate is called before this messageSender is removed from the strmap.
// It prevents the messageSender from being reused/reinitialized and then
// forgotten (leaving the stream open).
func (ms *messageSender) invalidate() {
ms.invalid = true
if ms.s != nil {
err := ms.s.Reset()
if err != nil {
log.Error(err)
}
ms.s = nil
}
}
func (ms *messageSender) ctxPrepOrInvalidate(ctx context.Context) error {
ms.lk.Lock()
defer ms.lk.Unlock()
errCh := make(chan error)
go func() {
errCh <- ms.prep()
}()
select {
case err := <-errCh:
if err != nil {
ms.invalidate()
}
return err
case <-ctx.Done():
ms.invalidate()
return ErrWriteTimeout
}
}
func (ms *messageSender) prep() error {
if ms.invalid {
return fmt.Errorf("message sender has been invalidated")
}
if ms.s != nil {
return nil
}
ctx, cancel := context.WithTimeout(ms.service.ctx, 3*time.Second)
defer cancel()
nstr, err := ms.service.host.NewStream(ctx, ms.p, ipfs.IPFSProtocolAppMainnetOne)
if err != nil {
return err
}
ms.r = ggio.NewDelimitedReader(nstr, inet.MessageSizeMax)
ms.w = ggio.NewDelimitedWriter(nstr)
ms.s = nstr
return nil
}
// streamReuseTries is the number of times we will try to reuse a stream to a
// given peer before giving up and reverting to the old one-message-per-stream
// behavior.
const streamReuseTries = 3
func (ms *messageSender) SendMessage(ctx context.Context, pmes *pb.Message) error {
ms.lk.Lock()
defer ms.lk.Unlock()
retry := false
for {
if err := ms.prep(); err != nil {
return err
}
err := ms.ctxWriteMsg(ctx, pmes)
switch err {
case ErrWriteTimeout:
err = ms.s.Reset()
if err != nil {
log.Error(err)
}
ms.s = nil
return err
case nil:
break
default:
err = ms.s.Reset()
if err != nil {
log.Error(err)
}
ms.s = nil
if retry {
return err
} else {
retry = true
continue
}
}
if ms.singleMes > streamReuseTries {
ms.s.Close()
ms.s = nil
} else if retry {
ms.singleMes++
}
return nil
}
}
func (ms *messageSender) SendRequest(ctx context.Context, pmes *pb.Message) (*pb.Message, error) {
pmes.RequestId = rand.Int31()
returnChan := make(chan *pb.Message)
ms.requestlk.Lock()
ms.requests[pmes.RequestId] = returnChan
ms.requestlk.Unlock()
defer ms.closeRequest(pmes.RequestId)
ms.lk.Lock()
defer ms.lk.Unlock()
retry := false
for {
if err := ms.prep(); err != nil {
return nil, err
}
err := ms.ctxWriteMsg(ctx, pmes)
switch err {
case ErrWriteTimeout:
err = ms.s.Reset()
if err != nil {
log.Error(err)
}
ms.s = nil
return nil, err
case nil:
break
default:
err = ms.s.Reset()
if err != nil {
log.Error(err)
}
ms.s = nil
if retry {
return nil, err
} else {
retry = true
continue
}
}
mes, err := ms.ctxReadMsg(ctx, returnChan)
if err != nil {
err = ms.s.Reset()
if err != nil {
log.Error(err)
}
ms.s = nil
return nil, err
}
if ms.singleMes > streamReuseTries {
ms.s.Close()
ms.s = nil
} else if retry {
ms.singleMes++
}
return mes, nil
}
}
// stop listening for responses
func (ms *messageSender) closeRequest(id int32) {
ms.requestlk.Lock()
ch, ok := ms.requests[id]
if ok {
close(ch)
delete(ms.requests, id)
}
ms.requestlk.Unlock()
}
func (ms *messageSender) ctxReadMsg(ctx context.Context, returnChan chan *pb.Message) (*pb.Message, error) {
t := time.NewTimer(ReadMessageTimeout)
defer t.Stop()
select {
case mes := <-returnChan:
return mes, nil
case <-ctx.Done():
return nil, ctx.Err()
case <-t.C:
return nil, ErrReadTimeout
}
}
func (ms *messageSender) ctxWriteMsg(ctx context.Context, pmes *pb.Message) error {
errCh := make(chan error)
go func() {
errCh <- ms.w.WriteMsg(pmes)
}()
select {
case err := <-errCh:
return err
case <-ctx.Done():
return ErrWriteTimeout
}
}