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main.go
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main.go
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// Copyright 2016-2019 The NATS Authors
// 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 main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"path/filepath"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/hedwi/nats"
"github.com/hedwi/nats/bench"
"github.com/hedwi/stan"
)
// Some sane defaults
const (
DefaultNumMsgs = 100000
DefaultNumPubs = 10
DefaultNumSubs = 0
DefaultSync = false
DefaultMessageSize = 128
DefaultIgnoreOld = false
DefaultMaxPubAcksInflight = 512
DefaultClientID = "benchmark"
)
func usage() {
log.Fatalf("Usage: stan-bench [-s server (%s)] [-c CLUSTER_ID] [-id CLIENT_ID] [-qgroup QUEUE_GROUP_NAME] [-np NUM_PUBLISHERS] [-ns NUM_SUBSCRIBERS] [-n NUM_MSGS] [-ms MESSAGE_SIZE] [-csv csvfile] [-mpa MAX_NUMBER_OF_PUBLISHED_ACKS_INFLIGHT] [-io] [-sync] [--creds credentials_file] [-cd PATH_TO_CERTS] [-cf CERTIFICATE_FILE] [-ck CERTIFICATE_KEY] [-u USERID] [-pw PASSWORD] <subject>\n", nats.DefaultURL)
}
var (
benchmark *bench.Benchmark
qTotalRecv int32
qSubsLeft int32
)
func main() {
var clusterID string
flag.StringVar(&clusterID, "c", "test-cluster", "The NATS Streaming cluster ID")
flag.StringVar(&clusterID, "cluster", "test-cluster", "The NATS Streaming cluster ID")
var urls = flag.String("s", nats.DefaultURL, "The NATS server URLs (separated by comma")
var numPubs = flag.Int("np", DefaultNumPubs, "Number of concurrent publishers")
var numSubs = flag.Int("ns", DefaultNumSubs, "Number of concurrent subscribers")
var numMsgs = flag.Int("n", DefaultNumMsgs, "Number of messages to publish")
var syncPub = flag.Bool("sync", DefaultSync, "Sync message publishing")
var messageSize = flag.Int("ms", DefaultMessageSize, "Message size in bytes.")
var ignoreOld = flag.Bool("io", DefaultIgnoreOld, "Subscribers ignore old messages")
var maxPubAcks = flag.Int("mpa", DefaultMaxPubAcksInflight, "Max number of published acks in flight")
var clientID = flag.String("id", DefaultClientID, "Benchmark process base client ID")
var csvFile = flag.String("csv", "", "Save bench data to csv file")
var queue = flag.String("qgroup", "", "Queue group name")
var userCreds = flag.String("creds", "", "Credentials File")
var certDir = flag.String("cd", "", "path to certs to load")
var certFile = flag.String("cf", "", "certificate file")
var certKey = flag.String("ck", "", "certificate key")
var user = flag.String("u", "", "user id")
var pswd = flag.String("pw", "", "password")
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) != 1 {
usage()
}
// Setup the connect options
opts := []nats.Option{nats.Name("NATS Streaming Benchmark")}
// Use UserCredentials
if *userCreds != "" {
opts = append(opts, nats.UserCredentials(*userCreds))
}
// Use BasicAuth
if len(*user) > 0 && len(*pswd) > 0 {
opts = append(opts, nats.UserInfo(*user, *pswd))
}
if strings.Contains(*urls, "tls://") {
if len(*certDir) > 0 {
certificateFiles, _ := filepath.Glob(filepath.Join(*certDir, "*.pem"))
opts = append(opts, nats.RootCAs(certificateFiles...))
} else if len(*certFile) > 0 && len(*certKey) > 0 {
opts = append(opts, nats.ClientCert(*certFile, *certKey))
} else {
usage()
}
}
benchmark = bench.NewBenchmark("NATS Streaming", *numSubs, *numPubs)
var startwg sync.WaitGroup
var donewg sync.WaitGroup
donewg.Add(*numPubs + *numSubs)
if *queue != "" {
qSubsLeft = int32(*numSubs)
}
// Run Subscribers first
startwg.Add(*numSubs)
for i := 0; i < *numSubs; i++ {
subID := fmt.Sprintf("%s-sub-%d", *clientID, i)
go runSubscriber(&startwg, &donewg, *urls, opts, clusterID, subID, *queue, *numMsgs, *messageSize, *ignoreOld)
}
startwg.Wait()
// Now Publishers
startwg.Add(*numPubs)
pubCounts := bench.MsgsPerClient(*numMsgs, *numPubs)
for i := 0; i < *numPubs; i++ {
pubID := fmt.Sprintf("%s-pub-%d", *clientID, i)
go runPublisher(&startwg, &donewg, *urls, opts, clusterID, pubCounts[i], *messageSize, *syncPub, pubID, *maxPubAcks)
}
log.Printf("Starting benchmark [msgs=%d, msgsize=%d, pubs=%d, subs=%d]\n", *numMsgs, *messageSize, *numPubs, *numSubs)
startwg.Wait()
donewg.Wait()
benchmark.Close()
fmt.Print(benchmark.Report())
if len(*csvFile) > 0 {
csv := benchmark.CSV()
ioutil.WriteFile(*csvFile, []byte(csv), 0644)
fmt.Printf("Saved metric data in csv file %s\n", *csvFile)
}
}
func runPublisher(startwg, donewg *sync.WaitGroup, url string, opts []nats.Option, clusterID string, numMsgs, msgSize int, sync bool, pubID string, maxPubAcksInflight int) {
nc, err := nats.Connect(url, opts...)
if err != nil {
log.Fatalf("Publisher %s can't connect: %v\n", pubID, err)
}
snc, err := stan.Connect(clusterID, pubID, stan.MaxPubAcksInflight(maxPubAcksInflight), stan.NatsConn(nc),
stan.SetConnectionLostHandler(func(_ stan.Conn, reason error) {
log.Fatalf("Connection lost, reason: %v", reason)
}))
if err != nil {
log.Fatalf("Publisher %s can't connect: %v\n", pubID, err)
}
startwg.Done()
args := flag.Args()
subj := args[0]
var msg []byte
if msgSize > 0 {
msg = make([]byte, msgSize)
}
published := 0
start := time.Now()
if !sync {
ch := make(chan bool)
acb := func(lguid string, err error) {
if err != nil {
log.Fatalf("Publisher %q got following error: %v", pubID, err)
}
published++
if published >= numMsgs {
ch <- true
}
}
for i := 0; i < numMsgs; i++ {
_, err := snc.PublishAsync(subj, msg, acb)
if err != nil {
log.Fatal(err)
}
}
<-ch
} else {
for i := 0; i < numMsgs; i++ {
err := snc.Publish(subj, msg)
if err != nil {
log.Fatal(err)
}
published++
}
}
benchmark.AddPubSample(bench.NewSample(numMsgs, msgSize, start, time.Now(), snc.NatsConn()))
snc.Close()
nc.Close()
donewg.Done()
}
func runSubscriber(startwg, donewg *sync.WaitGroup, url string, opts []nats.Option, clusterID, subID, queue string, numMsgs, msgSize int, ignoreOld bool) {
nc, err := nats.Connect(url, opts...)
if err != nil {
log.Fatalf("Subscriber %s can't connect: %v\n", subID, err)
}
snc, err := stan.Connect(clusterID, subID, stan.NatsConn(nc),
stan.SetConnectionLostHandler(func(_ stan.Conn, reason error) {
log.Fatalf("Connection lost, reason: %v", reason)
}))
if err != nil {
log.Fatalf("Subscriber %s can't connect: %v\n", subID, err)
}
args := flag.Args()
subj := args[0]
ch := make(chan time.Time, 2)
isQueue := queue != ""
received := 0
mcb := func(msg *stan.Msg) {
received++
if received == 1 {
ch <- time.Now()
}
if isQueue {
if atomic.AddInt32(&qTotalRecv, 1) >= int32(numMsgs) {
ch <- time.Now()
}
} else {
if received >= numMsgs {
ch <- time.Now()
}
}
}
var sub stan.Subscription
if ignoreOld {
sub, err = snc.QueueSubscribe(subj, queue, mcb)
} else {
sub, err = snc.QueueSubscribe(subj, queue, mcb, stan.DeliverAllAvailable())
}
if err != nil {
log.Fatalf("Subscriber %s can't subscribe: %v", subID, err)
}
startwg.Done()
start := <-ch
end := <-ch
benchmark.AddSubSample(bench.NewSample(received, msgSize, start, end, snc.NatsConn()))
// For queues, since not each member receives the total number of messages,
// when a member is done, it needs to publish a message to unblock other member(s).
if isQueue {
if sr := atomic.AddInt32(&qSubsLeft, -1); sr > 0 {
// Close this queue member first so that there is no chance that the
// server sends the message we are going to publish back to this member.
sub.Close()
snc.Publish(subj, []byte("done"))
}
}
snc.Close()
nc.Close()
donewg.Done()
}