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mqtt-replay: Add CLI option to override publish topic #12

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mqtt-replay: Add CLI option to override publish topic #12

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16 changes: 13 additions & 3 deletions mqtt-replay/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ var filename string
var startTimeSec uint
var endTimeSec uint // end time of 0 seconds doesn't make sense, so use it for "full file"
var versionMode bool
var topicOverride string

// internal state
var shouldHalt bool
Expand All @@ -50,6 +51,7 @@ func init() {
flag.StringVar(&filename, "i", "", "Input file (REQUIRED)")
flag.UintVar(&startTimeSec, "s", 0, "Starting time offset (seconds)")
flag.UintVar(&endTimeSec, "e", 0, "End time (seconds, leave out for full file)")
flag.StringVar(&topicOverride, "t", "", "Override publish topic (use this instead of recorded msg topic)")
flag.BoolVar(&versionMode, "version", false, "Print version number")
flag.Parse()

Expand Down Expand Up @@ -100,8 +102,16 @@ func readEntry(file *os.File) (MqttMessage, int64) {
return msg, payload_size
}

func effectiveTopic(originalT string) string {
if topicOverride != "" {
return topicOverride
}
return originalT
}

func publish(client mqtt.Client, msg MqttMessage) {
token := client.Publish(msg.Topic, byte(0), false, msg.Payload)
topic := effectiveTopic(msg.Topic)
token := client.Publish(topic, byte(0), false, msg.Payload)
token.Wait()
}

Expand Down Expand Up @@ -154,7 +164,7 @@ func (p *Playback) PlayFrom(startTimeMillis uint) {
for {
p.msgMillisRelative = msg.Millis - p.recordingStartTime
if p.msgMillisRelative >= int64(startTimeMillis) {
log.Printf("t=%6.2f s, %6d bytes, topic=%s\n", float32(p.msgMillisRelative)/1000.0, len, msg.Topic)
log.Printf("t=%6.2f s, %6d bytes, topic=%s\n", float32(p.msgMillisRelative)/1000.0, len, effectiveTopic(msg.Topic))
publish(p.Client, msg)

p.firstMsgMillis = msg.Millis
Expand Down Expand Up @@ -205,7 +215,7 @@ func (p *Playback) PlayNextMessage() bool {
targetWallclock := p.firstMsgWallclock + (msg.Millis - p.firstMsgMillis) + p.haltOffsetMillis
for {
if nowMillis() >= targetWallclock {
log.Printf("t=%6.2f s, %6d bytes, topic=%s\n", float32(p.msgMillisRelative)/1000.0, len, msg.Topic)
log.Printf("t=%6.2f s, %6d bytes, topic=%s\n", float32(p.msgMillisRelative)/1000.0, len, effectiveTopic(msg.Topic))
publish(p.Client, msg)
break
}
Expand Down
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