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broadcast.go
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broadcast.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package pbft
import (
"fmt"
"sync"
"time"
"github.com/hyperledger/fabric/consensus"
pb "github.com/hyperledger/fabric/protos"
)
type communicator interface {
consensus.Communicator
consensus.Inquirer
}
type broadcaster struct {
comm communicator
f int
broadcastTimeout time.Duration
msgChans map[uint64]chan *sendRequest
closed sync.WaitGroup
closedCh chan struct{}
}
type sendRequest struct {
msg *pb.Message
done chan bool
}
func newBroadcaster(self uint64, N int, f int, broadcastTimeout time.Duration, c communicator) *broadcaster {
queueSize := 10 // XXX increase after testing
chans := make(map[uint64]chan *sendRequest)
b := &broadcaster{
comm: c,
f: f,
broadcastTimeout: broadcastTimeout,
msgChans: chans,
closedCh: make(chan struct{}),
}
for i := 0; i < N; i++ {
if uint64(i) == self {
continue
}
chans[uint64(i)] = make(chan *sendRequest, queueSize)
}
// We do not start the go routines in the above loop to avoid concurrent map read/writes
for i := 0; i < N; i++ {
if uint64(i) == self {
continue
}
go b.drainer(uint64(i))
}
return b
}
func (b *broadcaster) Close() {
close(b.closedCh)
b.closed.Wait()
}
func (b *broadcaster) Wait() {
b.closed.Wait()
}
func (b *broadcaster) drainerSend(dest uint64, send *sendRequest, successLastTime bool) bool {
// Note, successLastTime is purely used to avoid flooding the log with unnecessary warning messages when a network problem is encountered
defer func() {
b.closed.Done()
}()
h, err := getValidatorHandle(dest)
if err != nil {
if successLastTime {
logger.Warningf("could not get handle for replica %d", dest)
}
send.done <- false
return false
}
err = b.comm.Unicast(send.msg, h)
if err != nil {
if successLastTime {
logger.Warningf("could not send to replica %d: %v", dest, err)
}
send.done <- false
return false
}
send.done <- true
return true
}
func (b *broadcaster) drainer(dest uint64) {
successLastTime := false
destChan, exsit := b.msgChans[dest] // Avoid doing the map lookup every send
if !exsit {
logger.Warningf("could not get message channel for replica %d", dest)
return
}
for {
select {
case send := <-destChan:
successLastTime = b.drainerSend(dest, send, successLastTime)
case <-b.closedCh:
for {
// Drain the message channel to free calling waiters before we shut down
select {
case send := <-destChan:
send.done <- false
b.closed.Done()
default:
return
}
}
}
}
}
func (b *broadcaster) unicastOne(msg *pb.Message, dest uint64, wait chan bool) {
select {
case b.msgChans[dest] <- &sendRequest{
msg: msg,
done: wait,
}:
default:
// If this channel is full, we must discard the message and flag it as done
wait <- false
b.closed.Done()
}
}
func (b *broadcaster) send(msg *pb.Message, dest *uint64) error {
select {
case <-b.closedCh:
return fmt.Errorf("broadcaster closed")
default:
}
var destCount int
var required int
if dest != nil {
destCount = 1
required = 1
} else {
destCount = len(b.msgChans)
required = destCount - b.f
}
wait := make(chan bool, destCount)
if dest != nil {
b.closed.Add(1)
b.unicastOne(msg, *dest, wait)
} else {
b.closed.Add(len(b.msgChans))
for i := range b.msgChans {
b.unicastOne(msg, i, wait)
}
}
succeeded := 0
timer := time.NewTimer(b.broadcastTimeout)
// This loop will try to send, until one of:
// a) the required number of sends succeed
// b) all sends complete regardless of success
// c) the timeout expires and the required number of sends have returned
outer:
for i := 0; i < destCount; i++ {
select {
case success := <-wait:
if success {
succeeded++
if succeeded >= required {
break outer
}
}
case <-timer.C:
for i := i; i < required; i++ {
<-wait
}
break outer
}
}
return nil
}
func (b *broadcaster) Unicast(msg *pb.Message, dest uint64) error {
return b.send(msg, &dest)
}
func (b *broadcaster) Broadcast(msg *pb.Message) error {
return b.send(msg, nil)
}