golang publisher error message

ulrich · January 2023

Hi,

i have written a golang base message producer using the solace golang API/SDK.

I create random messages and can define a level of parallelism and a message length.

The program works fine and creates some 1k's of messages per sec for 1k long messages. But after some time it always terminates with

{"level":"info","msg":"message published:{\"message\":\"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\",\"id\":\"3ec71a88-d228-48eb-8f1a-3f83b3f73045\"}","time":"2023-01-13T12:11:44Z"}

{"level":"info","msg":"topic: CXS/demo1/5/fb42d89f-d2f8-4500-8f46-9a0a5d6ff193","time":"2023-01-13T12:11:44Z"}

2023/01/13 12:11:44 log.go:45: WARNING solClientMsg.c:1247 (7fdc277fe640) Bad msg_p pointer '0xfc000db6' in solClient_msg_dup

panic: invalid configuration provided: error duplicating message: Bad msg_p pointer '0xfc000db6' in solClient_msg_dup

As the data is random generated I can't see how a duplicate message would come in play.

Can someone explain what is happening there and how to resolve?

mcardy · January 2023

@ulrich can you try adding

message.Dispose()

after the call to Publish, like this:

publishErr := directPublisher.Publish(message, resource.TopicOf(topic))
if publishErr != nil {
   panic(publishErr)
}
log.Info("message published:", messageBody)
message.Dispose()

amackenzie · January 2023

can we see the code? Also, there are formatting options in this forum for codeblocks. You can use the 3 tildes (the ` character) to form the start and choose the paragraph formatter to end it.

this is a code block

ulrich · January 2023

here you are:

package main

import (
   "encoding/json"
   "flag"
   "fmt"
   "github.com/satori/go.uuid"
   log "github.com/sirupsen/logrus"
   "math/rand"
   "os"
   "os/signal"
   "strconv"
   "time"

   "solace.dev/go/messaging"
   "solace.dev/go/messaging/pkg/solace/config"
   "solace.dev/go/messaging/pkg/solace/resource"
)

var (
   logLevel        = flag.Int("logLevel", 4, "log level (0-6)")
   logReportCaller = flag.Bool("logReportCaller", false, "add caller to log output")
   logFormatJson   = flag.Bool("logFormatJson", true, "log in json format")
)

func init() {
   flag.Parse()
   log.SetLevel(log.Level(*logLevel))
   log.SetReportCaller(*logReportCaller)
   log.SetFormatter(&log.TextFormatter{})
   if *logFormatJson {
      log.SetFormatter(&log.JSONFormatter{})
   }

}

func getEnv(key string) string {
   if val, ok := os.LookupEnv(key); ok {
      return val
   } else {
      log.Info("Missing environment variable ", key)
      os.Exit(8)
   }
   return ""
}

func main() {
   p, err := strconv.Atoi(getEnv("PARALLEL_PRODUCER"))

   if err != nil {
      log.Panic("PARALLEL_PRODUCER variable has to be a positive integer ")
   }

   TopicPrefix := getEnv("AEM_TOPIC_PREFIX")
   log.Info(TopicPrefix)

   // Configuration parameters
   brokerConfig := config.ServicePropertyMap{
      config.TransportLayerPropertyHost:                getEnv("SOLACE_HOST"),
      config.ServicePropertyVPNName:                    getEnv("SOLACE_VPN"),
      config.AuthenticationPropertySchemeBasicUserName: getEnv("SOLACE_USER"),
      config.AuthenticationPropertySchemeBasicPassword: getEnv("SOLACE_PASSWORD"),
   }
   messagingService, err := messaging.NewMessagingServiceBuilder().
      FromConfigurationProvider(brokerConfig).
      WithTransportSecurityStrategy(config.NewTransportSecurityStrategy().WithoutCertificateValidation()).
      Build()
   if err != nil {
      panic(err)
   }

   // Connect to the messaging serice
   if err := messagingService.Connect(); err != nil {
      panic(err)
   }

   log.Info("Connected to the broker? ", messagingService.IsConnected())

   //  Build a Direct Message Publisher
   directPublisher, builderErr := messagingService.CreateDirectMessagePublisherBuilder().Build()
   if builderErr != nil {
      panic(builderErr)
   }

   startErr := directPublisher.Start()
   if startErr != nil {
      panic(startErr)
   }

   log.Info("Direct Publisher running? ", directPublisher.IsRunning())

   msgSeqNum := 0

   eventInd, err := strconv.ParseBool(getEnv("EVENTS_IND"))
   if err != nil {
      log.Panic(err)
   }
   msgLength, err := strconv.Atoi(getEnv("MSG_LENGTH"))
   if err != nil {
      log.Panic(err)
   }
   for i := 0; i < p; i++ {

      go func(v int) {

         for directPublisher.IsReady() {
            //  Prepare outbound message payload and body
            var messageBody string
            messageBody, err = getRandomMessage(msgLength)
            if err != nil {
               log.Panic(err)
            }

            id := uuid.NewV4().String()

            messageBuilder := messagingService.MessageBuilder().
               WithProperty("application", "samples").
               WithProperty("language", "go")

            msgSeqNum++
            message, err := messageBuilder.BuildWithStringPayload(messageBody)
            if err != nil {
               panic(err)
            }
            topic := TopicPrefix + "/" + fmt.Sprintf("%d", v) + "/" + id
            log.Info("topic: ", topic)
            publishErr := directPublisher.Publish(message, resource.TopicOf(topic))
            if publishErr != nil {
               panic(publishErr)
            }
            log.Info("message published:", messageBody)
         }

      }(i)

   }

   // Handle interrupts

   c := make(chan os.Signal, 1)
   signal.Notify(c, os.Interrupt)

   // Block until a signal is received.
   <-c

   // TODO
   // Find way to shutdown the go routine
   // e.g use another channel, BOOl..etc
   // TODO

   // Terminate the Direct Publisher
   directPublisher.Terminate(2 * time.Second)
   log.Info("\nDirect Publisher Terminated? ", directPublisher.IsTerminated())

   // Disconnect the Message Service
   messagingService.Disconnect()
   log.Info("Messaging Service Disconnected? ", !messagingService.IsConnected())

}

var letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

func getRandomMessage(n int) (string, error) {
   // Seed the random number generator
   rand.Seed(time.Now().UnixNano())

   // Generate a random string of length n
   b := make([]byte, n)
   for i := range b {
      b[i] = letterBytes[rand.Intn(len(letterBytes))]
   }
   randomStr := string(b)

   // Generate a UUID
   id := uuid.NewV4()

   // Create the response object
   response := struct {
      Message string `json:"message"`
      ID      string `json:"id"`
   }{
      Message: randomStr,
      ID:      id.String(),
   }

   // Marshal the response to a JSON string
   responseJSON, err := json.Marshal(response)
   if err != nil {
      return "", err
   }

   return string(responseJSON), nil
}

ulrich · January 2023

getEnv("PARALLEL_PRODUCER")

defines the level of parallel internal instances this script runs - I used 10 to 40

getEnv("AEM_TOPIC_PREFIX")

just the topic prefix

mcardy · January 2023

Hi @ulrich,

There is a bug in the Go API that prevents multiple goroutines from sharing the same DirectMessagePublisher instance that will be fixed in a future release. In the meantime, using one DirectMessagePublisher instance per goroutine will resolve the issue.

ulrich · January 2023

code changed - for completeness

package main

import (
   "flag"
   log "github.com/sirupsen/logrus"
   "os"
   "os/signal"
   "solace.dev/go/messaging"
   "solace.dev/go/messaging/pkg/solace"
   "solace.dev/go/messaging/pkg/solace/config"
   "solace.dev/go/messaging/pkg/solace/message"
   "solace.dev/go/messaging/pkg/solace/resource"
   "time"
)

var (
   logLevel        = flag.Int("logLevel", 4, "log level (0-6)")
   logReportCaller = flag.Bool("logReportCaller", false, "add caller to log output")
   logFormatJson   = flag.Bool("logFormatJson", true, "log in json format")
)

func init() {
   flag.Parse()
   log.SetLevel(log.Level(*logLevel))
   log.SetReportCaller(*logReportCaller)
   log.SetFormatter(&log.TextFormatter{})
   if *logFormatJson {
      log.SetFormatter(&log.JSONFormatter{})
   }

}

func getEnv(key string) string {
   if val, ok := os.LookupEnv(key); ok {
      return val
   } else {
      log.Info("Missing environment variable ", key)
      os.Exit(8)
   }
   return ""
}

// Message Handler
func MessageHandler(message message.InboundMessage) {
   log.Debug("Message Dump %s \n", message)
   payload, ok := message.GetPayloadAsBytes()
   if ok {
      log.Info(string(payload))
      persistentReceiver.Ack(message)
   } else {
      id, ok := message.GetApplicationMessageID()
      if ok {
         log.Error("message wasn't able to be processed: ", id)
      } else {
         log.Error("general issue with message: ", message.String())
      }
   }
   log.Info("")

}

var persistentReceiver solace.PersistentMessageReceiver

func main() {

   // Configuration parameters
   brokerConfig := config.ServicePropertyMap{
      config.TransportLayerPropertyHost:                getEnv("SOLACE_HOST"),
      config.ServicePropertyVPNName:                    getEnv("SOLACE_VPN"),
      config.AuthenticationPropertySchemeBasicUserName: getEnv("SOLACE_USER"),
      config.AuthenticationPropertySchemeBasicPassword: getEnv("SOLACE_PASSWORD"),
   }
   messagingService, err := messaging.NewMessagingServiceBuilder().
      FromConfigurationProvider(brokerConfig).
      WithTransportSecurityStrategy(config.NewTransportSecurityStrategy().WithoutCertificateValidation()).
      Build()
   if err != nil {
      panic(err)
   }

   // Connect to the messaging serice
   if err := messagingService.Connect(); err != nil {
      panic(err)
   }

   log.Info("Connected to the broker? ", messagingService.IsConnected())

   queueName := getEnv("AEM_QUEUE")
   durableNonExclusiveQueue := resource.QueueDurableNonExclusive(queueName)
   //nonDurableExclusiveQueue := resource.QueueNonDurableExclusive(queueName)

   // Build a Guaranteed message receiver and bind to the given queue
   persistentReceiver, err = messagingService.CreatePersistentMessageReceiverBuilder().WithMessageClientAcknowledgement().Build(durableNonExclusiveQueue)

   log.Info("Bound to queue: %s", queueName)

   // Handling a panic from a non existing queue

   defer func() {

      if err := recover(); err != nil {

         log.Printf("Make sure queue name '%s' exists on the broker.\nThe following error occurred when attempting to connect to create a Persistent Message Receiver:\n%s", queueName, err)

      }

   }()

   // Start Persistent Message Receiver
   if err := persistentReceiver.Start(); err != nil {
      panic(err)
   }

   log.Info("Persistent Receiver running? ", persistentReceiver.IsRunning())

   if regErr := persistentReceiver.ReceiveAsync(MessageHandler); regErr != nil {
      panic(regErr)
   }

   // Handle interrupts

   c := make(chan os.Signal, 1)
   signal.Notify(c, os.Interrupt)

   // Block until a signal is received.
   <-c

   // TODO
   // Find way to shutdown the go routine
   // e.g use another channel, BOOl..etc
   // TODO

   // Terminate the Persistent Receiver
   persistentReceiver.Terminate(2 * time.Second)
   log.Info("\nDirect Receiver Terminated? ", persistentReceiver.IsTerminated())

   // Disconnect the Message Service
   messagingService.Disconnect()
   log.Info("Messaging Service Disconnected? ", !messagingService.IsConnected())

}

ulrich · January 2023

not yet - different errors now:

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81affd640) datablock_free '0x7fa87413c7e0', refcount=-2 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81affd640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81affd640) datablock_free '0x7fa87413c7e0', refcount=-1 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81affd640) datablock already free '0x7fa87413c7e0', refcount=-1 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81affd640) datablock_free '0x7fa87413c7e0', refcount=-2 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa8127fc640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa8127fc640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa8127fc640) datablock_free '0x7fa87413c7e0', refcount=-1 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa8127fc640) datablock already free '0x7fa87413c7e0', refcount=-1 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa8127fc640) datablock_free '0x7fa87413c7e0', refcount=-2 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

{"level":"info","msg":"topic: CXS/demo1/8/b68c7425-7076-4ac0-b0cd-9f4caae4992e","time":"2023-01-13T20:22:03Z"}

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=-1 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

{"level":"info","msg":"message published:{\"message\":\"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\",\"id\":\"87d8fee3-ef92-4c43-bf32-3df5eb1998ba\"}","time":"2023-01-13T20:22:03Z"}

{"level":"info","msg":"message published:{\"message\":\"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\",\"id\":\"3aaceb73-57dd-422a-9cb3-03f917e02aa1\"}","time":"2023-01-13T20:22:03Z"}

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81bfff640) datablock_free '0x7fa87413c7e0', refcount=-1 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=-1 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81bfff640) datablock_free '0x7fa87413c7e0', refcount=-2 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=-2 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81bfff640) datablock_free '0x7fa87413c7e0', refcount=-3 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81bfff640) datablock_free '0x7fa87413c7e0', refcount=-1 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

{"level":"info","msg":"topic: CXS/demo1/12/874154a4-9a58-4eae-8a40-ffa5a84f7698","time":"2023-01-13T20:22:03Z"}

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:41: ERROR solClientMsg.c:943                   (7fa81bfff640) datablock_free '0x7fa87413c7e0', refcount=-1 is less then 0 /opt/cvsdirs/loadbuild/jenkins/slave/workspace/ccsmp-build@2/impl/solClientMsg.c:943

2023/01/13 20:22:03 log.go:37: CRITICAL solClientMsg.c:943                   (7fa81bfff640) datablock already free '0x7fa87413c7e0', refcount=0 /opt/^Cazureuser@accenture-sandbox:~/tmp/AdvancedEventMesh$

mcardy · January 2023

@ulrich can you share the code you are using? What platform are you on? What version of the Go API are you using?

ulrich · January 2023

https://solace.community/discussion/comment/5603#Comment_5603

This is the code.

Ubuntu 22.04.1 LTS

go version go1.18.1 linux/amd64

mcardy · January 2023

@ulrich the changed code provided was receive code, not publishing code. Was the error occurring on the receive side now?

Can you share the version of the Solace Go API?

ulrich · January 2023

https://solace.community/discussion/comment/5610#Comment_5610

sorry for that. Was a copy mistake with the code...

from the go mod file

solace.dev/go/messaging v1.1.0

producer code here

package main

import (
   "encoding/json"
   "flag"
   "fmt"
   "github.com/satori/go.uuid"
   log "github.com/sirupsen/logrus"
   "math/rand"
   "os"
   "os/signal"
   "strconv"
   "time"

   "solace.dev/go/messaging"
   "solace.dev/go/messaging/pkg/solace/config"
   "solace.dev/go/messaging/pkg/solace/resource"
)

var (
   logLevel        = flag.Int("logLevel", 4, "log level (0-6)")
   logReportCaller = flag.Bool("logReportCaller", false, "add caller to log output")
   logFormatJson   = flag.Bool("logFormatJson", true, "log in json format")
)

func init() {
   flag.Parse()
   log.SetLevel(log.Level(*logLevel))
   log.SetReportCaller(*logReportCaller)
   log.SetFormatter(&log.TextFormatter{})
   if *logFormatJson {
      log.SetFormatter(&log.JSONFormatter{})
   }

}

func getEnv(key string) string {
   if val, ok := os.LookupEnv(key); ok {
      return val
   } else {
      log.Info("Missing environment variable ", key)
      os.Exit(8)
   }
   return ""
}

func main() {
   p, err := strconv.Atoi(getEnv("PARALLEL_PRODUCER"))

   if err != nil {
      log.Panic("PARALLEL_PRODUCER variable has to be a positive integer ")
   }

   msgSeqNum := 0

   for i := 0; i < p; i++ {

      go func(v int) {

         msgLength, err := strconv.Atoi(getEnv("MSG_LENGTH"))
         if err != nil {
            log.Panic(err)
         }

         TopicPrefix := getEnv("AEM_TOPIC_PREFIX")
         log.Info(TopicPrefix)

         // Configuration parameters
         brokerConfig := config.ServicePropertyMap{
            config.TransportLayerPropertyHost:                getEnv("AEM_CONNECTION_STRING"),
            config.ServicePropertyVPNName:                    getEnv("AEM_VPN"),
            config.AuthenticationPropertySchemeBasicUserName: getEnv("AEM_USER"),
            config.AuthenticationPropertySchemeBasicPassword: getEnv("AEM_PASSWORD"),
         }
         messagingService, err := messaging.NewMessagingServiceBuilder().
            FromConfigurationProvider(brokerConfig).
            WithTransportSecurityStrategy(config.NewTransportSecurityStrategy().WithoutCertificateValidation()).
            Build()
         if err != nil {
            panic(err)
         }

         // Connect to the messaging serice
         if err := messagingService.Connect(); err != nil {
            panic(err)
         }

         log.Info("Connected to the broker? ", messagingService.IsConnected())

         //  Build a Direct Message Publisher
         directPublisher, builderErr := messagingService.CreateDirectMessagePublisherBuilder().Build()
         if builderErr != nil {
            panic(builderErr)
         }

         startErr := directPublisher.Start()
         if startErr != nil {
            panic(startErr)
         }

         log.Info("Direct Publisher running? ", directPublisher.IsRunning())

         for directPublisher.IsReady() {
            //  Prepare outbound message payload and body
            var messageBody string
            messageBody, err = getRandomMessage(msgLength)
            if err != nil {
               log.Panic(err)
            }

            id := uuid.NewV4().String()

            messageBuilder := messagingService.MessageBuilder().
               WithProperty("application", "samples").
               WithProperty("language", "go")

            msgSeqNum++
            message, err := messageBuilder.BuildWithStringPayload(messageBody)
            if err != nil {
               panic(err)
            }
            topic := TopicPrefix + "/" + fmt.Sprintf("%d", v) + "/" + id
            log.Info("topic: ", topic)
            publishErr := directPublisher.Publish(message, resource.TopicOf(topic))
            if publishErr != nil {
               panic(publishErr)
            }
            log.Info("message published:", messageBody)
         }

         // Terminate the Direct Publisher
         directPublisher.Terminate(2 * time.Second)
         log.Info("\nDirect Publisher Terminated? ", directPublisher.IsTerminated())

         // Disconnect the Message Service
         messagingService.Disconnect()
         log.Info("Messaging Service Disconnected? ", !messagingService.IsConnected())

      }(i)

   }

   // Handle interrupts

   c := make(chan os.Signal, 1)
   signal.Notify(c, os.Interrupt)

   // Block until a signal is received.
   <-c

   // TODO
   // Find way to shutdown the go routine
   // e.g use another channel, BOOl..etc
   // TODO

}

var letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

func getRandomMessage(n int) (string, error) {
   // Seed the random number generator
   rand.Seed(time.Now().UnixNano())

   // Generate a random string of length n
   b := make([]byte, n)
   for i := range b {
      b[i] = letterBytes[rand.Intn(len(letterBytes))]
   }
   randomStr := string(b)

   // Generate a UUID
   id := uuid.NewV4()

   // Create the response object
   response := struct {
      Message string `json:"message"`
      ID      string `json:"id"`
   }{
      Message: randomStr,
      ID:      id.String(),
   }

   // Marshal the response to a JSON string
   responseJSON, err := json.Marshal(response)
   if err != nil {
      return "", err
   }

   return string(responseJSON), nil
}

mcardy · January 2023

@ulrich using your code and 40 parallel publishers, I do not hit your error (tried on a few different systems and let it run for a while). Are there any other details you can provide?

Unrelated to the problem, but you can have multiple direct publishers on the same messaging service (e.g. share the messaging service outside of the goroutines) instead of a separate messaging service per goroutine. This will use fewer client and server side resources.

ulrich · January 2023

I am back to

{"level":"info","msg":"message published:{\"message\":\"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\",\"id\":\"2a388f7b-d14a-4d10-9670-e1968f5d0d3b\"}","time":"2023-01-16T18:54:11Z"}
2023/01/16 18:54:11 log.go:45: WARNING solClientMsg.c:1247                  (7fcf6effd640) Bad msg_p pointer '0xbc000ee7' in solClient_msg_dup
{"level":"info","msg":"topic: CXS/demo1/37/8a584b2b-fbda-4cce-ac47-06d80a30b33d","time":"2023-01-16T18:54:11Z"}
panic: invalid configuration provided: error duplicating message: Bad msg_p pointer '0xbc000ee7' in solClient_msg_dup


goroutine 35 [running]:
main.main.func1(0x0?)
        /home/azureuser/tmp/AdvancedEventMesh/cmd/producer/main.go:126 +0xa05
created by main.main
        /home/azureuser/tmp/AdvancedEventMesh/cmd/producer/main.go:58 +0x94
exit status 2

data dog states no problems

producer runs on Azure VM and solace server on AWS.

mcardy · January 2023

@ulrich can you try adding

message.Dispose()

after the call to Publish, like this:

publishErr := directPublisher.Publish(message, resource.TopicOf(topic))
if publishErr != nil {
   panic(publishErr)
}
log.Info("message published:", messageBody)
message.Dispose()

ulrich · January 2023

looking good. Will let the producer run over night

ulrich · January 2023

As stated above - the dispose fixed the issue. Process run stable the whole night. Thanks!

For completeness the working code:

package main

import (
   "encoding/json"
   "flag"
   "fmt"
   "github.com/satori/go.uuid"
   log "github.com/sirupsen/logrus"
   "math/rand"
   "os"
   "os/signal"
   "strconv"
   "time"

   "solace.dev/go/messaging"
   "solace.dev/go/messaging/pkg/solace/config"
   "solace.dev/go/messaging/pkg/solace/resource"
)

var (
   logLevel        = flag.Int("logLevel", 4, "log level (0-6)")
   logReportCaller = flag.Bool("logReportCaller", false, "add caller to log output")
   logFormatJson   = flag.Bool("logFormatJson", true, "log in json format")
)

func init() {
   flag.Parse()
   log.SetLevel(log.Level(*logLevel))
   log.SetReportCaller(*logReportCaller)
   log.SetFormatter(&log.TextFormatter{})
   if *logFormatJson {
      log.SetFormatter(&log.JSONFormatter{})
   }

}

func getEnv(key string) string {
   if val, ok := os.LookupEnv(key); ok {
      return val
   } else {
      log.Info("Missing environment variable ", key)
      os.Exit(8)
   }
   return ""
}

func main() {
   p, err := strconv.Atoi(getEnv("PARALLEL_PRODUCER"))

   if err != nil {
      log.Panic("PARALLEL_PRODUCER variable has to be a positive integer ")
   }

   msgSeqNum := 0

   for i := 0; i < p; i++ {

      go func(v int) {

         msgLength, err := strconv.Atoi(getEnv("MSG_LENGTH"))
         if err != nil {
            log.Panic(err)
         }

         TopicPrefix := getEnv("SOLACE_TOPIC_PREFIX")
         log.Info(TopicPrefix)

         // Configuration parameters
         brokerConfig := config.ServicePropertyMap{
            config.TransportLayerPropertyHost:                getEnv("SOLACE_HOST"),
            config.ServicePropertyVPNName:                    getEnv("SOLACE_VPN"),
            config.AuthenticationPropertySchemeBasicUserName: getEnv("SOLACE_USER"),
            config.AuthenticationPropertySchemeBasicPassword: getEnv("SOLACE_PASSWORD"),
         }
         messagingService, err := messaging.NewMessagingServiceBuilder().
            FromConfigurationProvider(brokerConfig).
            WithTransportSecurityStrategy(config.NewTransportSecurityStrategy().WithoutCertificateValidation()).
            Build()
         if err != nil {
            panic(err)
         }

         // Connect to the messaging serice
         if err := messagingService.Connect(); err != nil {
            panic(err)
         }

         log.Info("Connected to the broker? ", messagingService.IsConnected())

         //  Build a Direct Message Publisher
         directPublisher, builderErr := messagingService.CreateDirectMessagePublisherBuilder().Build()
         if builderErr != nil {
            panic(builderErr)
         }

         startErr := directPublisher.Start()
         if startErr != nil {
            panic(startErr)
         }

         log.Info("Direct Publisher running? ", directPublisher.IsRunning())

         for directPublisher.IsReady() {
            //  Prepare outbound message payload and body
            var messageBody string
            messageBody, err = getRandomMessage(msgLength)
            if err != nil {
               log.Panic(err)
            }

            id := uuid.NewV4().String()

            messageBuilder := messagingService.MessageBuilder().
               WithProperty("application", "samples").
               WithProperty("language", "go")

            msgSeqNum++
            message, err := messageBuilder.BuildWithStringPayload(messageBody)
            if err != nil {
               panic(err)
            }
            topic := TopicPrefix + "/" + fmt.Sprintf("%d", v) + "/" + id
            log.Info("topic: ", topic)
            publishErr := directPublisher.Publish(message, resource.TopicOf(topic))
            if publishErr != nil {
               panic(publishErr)
            }
            log.Info("message published:", messageBody)
            message.Dispose()

         }

         // Terminate the Direct Publisher
         directPublisher.Terminate(2 * time.Second)
         log.Info("\nDirect Publisher Terminated? ", directPublisher.IsTerminated())

         // Disconnect the Message Service
         messagingService.Disconnect()
         log.Info("Messaging Service Disconnected? ", !messagingService.IsConnected())

      }(i)

   }

   // Handle interrupts

   c := make(chan os.Signal, 1)
   signal.Notify(c, os.Interrupt)

   // Block until a signal is received.
   <-c

   // TODO
   // Find way to shutdown the go routine
   // e.g use another channel, BOOl..etc
   // TODO

}

var letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

func getRandomMessage(n int) (string, error) {
   // Seed the random number generator
   rand.Seed(time.Now().UnixNano())

   // Generate a random string of length n
   b := make([]byte, n)
   for i := range b {
      b[i] = letterBytes[rand.Intn(len(letterBytes))]
   }
   randomStr := string(b)

   // Generate a UUID
   id := uuid.NewV4()

   // Create the response object
   response := struct {
      Message string `json:"message"`
      ID      string `json:"id"`
   }{
      Message: randomStr,
      ID:      id.String(),
   }

   // Marshal the response to a JSON string
   responseJSON, err := json.Marshal(response)
   if err != nil {
      return "", err
   }

   return string(responseJSON), nil
}

🎄 Happy Holidays! 🥳

Happy Holidays!

golang publisher error message

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