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// Copyright 2017 The Gorilla WebSocket Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package websocket
import (
"io"
"io/ioutil"
"sync/atomic"
"testing"
)
// broadcastBench allows to run broadcast benchmarks.
// In every broadcast benchmark we create many connections, then send the same
// message into every connection and wait for all writes complete. This emulates
// an application where many connections listen to the same data - i.e. PUB/SUB
// scenarios with many subscribers in one channel.
type broadcastBench struct {
w io.Writer
closeCh chan struct{}
doneCh chan struct{}
count int32
conns []*broadcastConn
compression bool
usePrepared bool
}
type broadcastMessage struct {
payload []byte
prepared *PreparedMessage
}
type broadcastConn struct {
conn *Conn
msgCh chan *broadcastMessage
}
func newBroadcastConn(c *Conn) *broadcastConn {
return &broadcastConn{
conn: c,
msgCh: make(chan *broadcastMessage, 1),
}
}
func newBroadcastBench(usePrepared, compression bool) *broadcastBench {
bench := &broadcastBench{
w: ioutil.Discard,
doneCh: make(chan struct{}),
closeCh: make(chan struct{}),
usePrepared: usePrepared,
compression: compression,
}
bench.makeConns(10000)
return bench
}
func (b *broadcastBench) makeConns(numConns int) {
conns := make([]*broadcastConn, numConns)
for i := 0; i < numConns; i++ {
c := newTestConn(nil, b.w, true)
if b.compression {
c.enableWriteCompression = true
c.newCompressionWriter = compressNoContextTakeover
}
conns[i] = newBroadcastConn(c)
go func(c *broadcastConn) {
for {
select {
case msg := <-c.msgCh:
if msg.prepared != nil {
c.conn.WritePreparedMessage(msg.prepared)
} else {
c.conn.WriteMessage(TextMessage, msg.payload)
}
val := atomic.AddInt32(&b.count, 1)
if val%int32(numConns) == 0 {
b.doneCh <- struct{}{}
}
case <-b.closeCh:
return
}
}
}(conns[i])
}
b.conns = conns
}
func (b *broadcastBench) close() {
close(b.closeCh)
}
func (b *broadcastBench) broadcastOnce(msg *broadcastMessage) {
for _, c := range b.conns {
c.msgCh <- msg
}
<-b.doneCh
}
func BenchmarkBroadcast(b *testing.B) {
benchmarks := []struct {
name string
usePrepared bool
compression bool
}{
{"NoCompression", false, false},
{"Compression", false, true},
{"NoCompressionPrepared", true, false},
{"CompressionPrepared", true, true},
}
payload := textMessages(1)[0]
for _, bm := range benchmarks {
b.Run(bm.name, func(b *testing.B) {
bench := newBroadcastBench(bm.usePrepared, bm.compression)
defer bench.close()
b.ResetTimer()
for i := 0; i < b.N; i++ {
message := &broadcastMessage{
payload: payload,
}
if bench.usePrepared {
pm, _ := NewPreparedMessage(TextMessage, message.payload)
message.prepared = pm
}
bench.broadcastOnce(message)
}
b.ReportAllocs()
})
}
}
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