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worker.go
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worker.go
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package main
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"os"
"strings"
"time"
mqtt "github.com/eclipse/paho.mqtt.golang"
)
type PayloadGenerator func(i int) string
func defaultPayloadGen() PayloadGenerator {
return func(i int) string {
return fmt.Sprintf("this is msg #%d!", i)
}
}
func constantPayloadGenerator(payload string) PayloadGenerator {
return func(i int) string {
return payload
}
}
func filePayloadGenerator(filepath string) PayloadGenerator {
inputPath := strings.Replace(filepath, "@", "", 1)
content, err := ioutil.ReadFile(inputPath)
if err != nil {
fmt.Printf("error reading payload file: %v\n", err)
os.Exit(1)
}
return func(i int) string {
return string(content)
}
}
type Worker struct {
WorkerId int
BrokerUrl string
Username string
Password string
SkipTLSVerification bool
NumberOfMessages int
PayloadGenerator PayloadGenerator
Timeout time.Duration
Retained bool
PublisherQoS byte
SubscriberQoS byte
CA []byte
Cert []byte
Key []byte
PauseBetweenMessages time.Duration
}
func setSkipTLS(o *mqtt.ClientOptions) {
oldTLSCfg := o.TLSConfig
if oldTLSCfg == nil {
oldTLSCfg = &tls.Config{}
}
oldTLSCfg.InsecureSkipVerify = true
o.SetTLSConfig(oldTLSCfg)
}
func NewTLSConfig(ca, certificate, privkey []byte) (*tls.Config, error) {
// Import trusted certificates from CA
certpool := x509.NewCertPool()
ok := certpool.AppendCertsFromPEM(ca)
if !ok {
return nil, fmt.Errorf("CA is invalid")
}
// Import client certificate/key pair
cert, err := tls.X509KeyPair(certificate, privkey)
if err != nil {
return nil, err
}
// Create tls.Config with desired tls properties
return &tls.Config{
// RootCAs = certs used to verify server cert.
RootCAs: certpool,
// ClientAuth = whether to request cert from server.
// Since the server is set up for SSL, this happens
// anyways.
ClientAuth: tls.NoClientCert,
// ClientCAs = certs used to validate client cert.
ClientCAs: nil,
// InsecureSkipVerify = verify that cert contents
// match server. IP matches what is in cert etc.
InsecureSkipVerify: false,
// Certificates = list of certs client sends to server.
Certificates: []tls.Certificate{cert},
}, nil
}
func (w *Worker) Run(ctx context.Context) {
verboseLogger.Printf("[%d] initializing\n", w.WorkerId)
queue := make(chan [2]string)
cid := w.WorkerId
t := randomSource.Int31()
hostname, err := os.Hostname()
if err != nil {
panic(err)
}
topicName := fmt.Sprintf(topicNameTemplate, hostname, w.WorkerId, t)
subscriberClientId := fmt.Sprintf(subscriberClientIdTemplate, hostname, w.WorkerId, t)
publisherClientId := fmt.Sprintf(publisherClientIdTemplate, hostname, w.WorkerId, t)
verboseLogger.Printf("[%d] topic=%s subscriberClientId=%s publisherClientId=%s\n", cid, topicName, subscriberClientId, publisherClientId)
publisherOptions := mqtt.NewClientOptions().SetClientID(publisherClientId).SetUsername(w.Username).SetPassword(w.Password).AddBroker(w.BrokerUrl)
subscriberOptions := mqtt.NewClientOptions().SetClientID(subscriberClientId).SetUsername(w.Username).SetPassword(w.Password).AddBroker(w.BrokerUrl)
subscriberOptions.SetDefaultPublishHandler(func(client mqtt.Client, msg mqtt.Message) {
queue <- [2]string{msg.Topic(), string(msg.Payload())}
})
if len(w.CA) > 0 || len(w.Key) > 0 {
tlsConfig, err := NewTLSConfig(w.CA, w.Cert, w.Key)
if err != nil {
panic(err)
}
subscriberOptions.SetTLSConfig(tlsConfig)
publisherOptions.SetTLSConfig(tlsConfig)
}
if w.SkipTLSVerification {
setSkipTLS(publisherOptions)
setSkipTLS(subscriberOptions)
}
subscriber := mqtt.NewClient(subscriberOptions)
verboseLogger.Printf("[%d] connecting subscriber\n", w.WorkerId)
if token := subscriber.Connect(); token.WaitTimeout(w.Timeout) && token.Error() != nil {
resultChan <- Result{
WorkerId: w.WorkerId,
Event: ConnectFailedEvent,
Error: true,
ErrorMessage: token.Error(),
}
return
}
defer func() {
verboseLogger.Printf("[%d] unsubscribe\n", w.WorkerId)
if token := subscriber.Unsubscribe(topicName); token.WaitTimeout(w.Timeout) && token.Error() != nil {
fmt.Printf("failed to unsubscribe: %v\n", token.Error())
}
subscriber.Disconnect(5)
}()
verboseLogger.Printf("[%d] subscribing to topic\n", w.WorkerId)
if token := subscriber.Subscribe(topicName, w.SubscriberQoS, nil); token.WaitTimeout(w.Timeout) && token.Error() != nil {
resultChan <- Result{
WorkerId: w.WorkerId,
Event: SubscribeFailedEvent,
Error: true,
ErrorMessage: token.Error(),
}
return
}
publisher := mqtt.NewClient(publisherOptions)
verboseLogger.Printf("[%d] connecting publisher\n", w.WorkerId)
if token := publisher.Connect(); token.WaitTimeout(w.Timeout) && token.Error() != nil {
resultChan <- Result{
WorkerId: w.WorkerId,
Event: ConnectFailedEvent,
Error: true,
ErrorMessage: token.Error(),
}
return
}
verboseLogger.Printf("[%d] starting control loop %s\n", w.WorkerId, topicName)
stopWorker := false
receivedCount := 0
publishedCount := 0
t0 := time.Now()
for i := 0; i < w.NumberOfMessages; i++ {
text := w.PayloadGenerator(i)
token := publisher.Publish(topicName, w.PublisherQoS, w.Retained, text)
publishedCount++
token.WaitTimeout(w.Timeout)
time.Sleep(w.PauseBetweenMessages)
}
publisher.Disconnect(5)
publishTime := time.Since(t0)
verboseLogger.Printf("[%d] all messages published\n", w.WorkerId)
t0 = time.Now()
for receivedCount < w.NumberOfMessages && !stopWorker {
select {
case <-queue:
receivedCount++
verboseLogger.Printf("[%d] %d/%d received\n", w.WorkerId, receivedCount, w.NumberOfMessages)
if receivedCount == w.NumberOfMessages {
resultChan <- Result{
WorkerId: w.WorkerId,
Event: CompletedEvent,
PublishTime: publishTime,
ReceiveTime: time.Since(t0),
MessagesReceived: receivedCount,
MessagesPublished: publishedCount,
}
} else {
resultChan <- Result{
WorkerId: w.WorkerId,
Event: ProgressReportEvent,
PublishTime: publishTime,
ReceiveTime: time.Since(t0),
MessagesReceived: receivedCount,
MessagesPublished: publishedCount,
}
}
case <-ctx.Done():
var event string
var isError bool
switch ctx.Err().(type) {
case TimeoutError:
verboseLogger.Printf("[%d] received abort signal due to test timeout", w.WorkerId)
event = TimeoutExceededEvent
isError = true
default:
verboseLogger.Printf("[%d] received abort signal", w.WorkerId)
event = AbortedEvent
isError = false
}
stopWorker = true
resultChan <- Result{
WorkerId: w.WorkerId,
Event: event,
PublishTime: publishTime,
MessagesReceived: receivedCount,
MessagesPublished: publishedCount,
Error: isError,
}
}
}
verboseLogger.Printf("[%d] worker finished\n", w.WorkerId)
}