create pubsub topic on startup if it doesn't exists

README.md

@@ -156,6 +156,7 @@ Dispatchers handle vehicle data processing upon its arrival at Fleet Telemetry s
   * Configure stream names directly by setting the streams config `"kinesis": { "streams": { *topic_name*: stream_name } }`
   * Override stream names with env variables: KINESIS_STREAM_\*uppercase topic\* ex.: `KINESIS_STREAM_V`
 * Google pubsub: Along with the required pubsub config (See ./test/integration/config.json for example), be sure to set the environment variable `GOOGLE_APPLICATION_CREDENTIALS`
+  * On startup, the server will attempt to create missing topics and panic on failure.
 * ZMQ: Configure with the config.json file.  See implementation here: [config/config.go](./config/config.go)
 * Logger: This is a simple STDOUT logger that serializes the protos to json.
 

cmd/main.go

@@ -63,7 +63,7 @@ func startServer(config *config.Config, airbrakeNotifier *gobrake.Notifier, logg
 		monitoring.StartServerMetrics(config, logger, registry)
 	}
 
-	dispatchers, producerRules, err := config.ConfigureProducers(airbrakeHandler, logger)
+	dispatchers, producerRules, err := config.ConfigureProducers(airbrakeHandler, logger, false)
 	if err != nil {
 		return err
 	}

config/config.go

@@ -249,7 +249,8 @@ func (c *Config) prometheusEnabled() bool {
 }
 
 // ConfigureProducers validates and establishes connections to the producers (kafka/pubsub/logger)
-func (c *Config) ConfigureProducers(airbrakeHandler *airbrake.Handler, logger *logrus.Logger) (map[telemetry.Dispatcher]telemetry.Producer, map[string][]telemetry.Producer, error) {
+func (c *Config) ConfigureProducers(airbrakeHandler *airbrake.Handler, logger *logrus.Logger, test bool) (map[telemetry.Dispatcher]telemetry.Producer, map[string][]telemetry.Producer, error) {
+	var pubsubTxTypes []string
 	reliableAckSources, err := c.configureReliableAckSources()
 	if err != nil {
 		return nil, nil, err
@@ -319,6 +320,9 @@ func (c *Config) ConfigureProducers(airbrakeHandler *airbrake.Handler, logger *l
 	for recordName, dispatchRules := range c.Records {
 		var dispatchFuncs []telemetry.Producer
 		for _, dispatchRule := range dispatchRules {
+			if dispatchRule == telemetry.Pubsub {
+				pubsubTxTypes = append(pubsubTxTypes, recordName)
+			}
 			dispatchFuncs = append(dispatchFuncs, producers[dispatchRule])
 		}
 		dispatchProducerRules[recordName] = dispatchFuncs
@@ -328,6 +332,12 @@ func (c *Config) ConfigureProducers(airbrakeHandler *airbrake.Handler, logger *l
 		}
 	}
 
+	if !test && len(pubsubTxTypes) > 0 {
+		if err := producers[telemetry.Pubsub].(*googlepubsub.Producer).ProvisionTopics(pubsubTxTypes); err != nil {
+			return nil, nil, err
+		}
+	}
+
 	return producers, dispatchProducerRules, nil
 }
 

config/config_test.go

@@ -133,7 +133,7 @@ var _ = Describe("Test full application config", func() {
 			config, err := loadTestApplicationConfig(TestSmallConfig)
 			Expect(err).NotTo(HaveOccurred())
 
-			_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(producers["V"]).To(HaveLen(1))
 
@@ -174,7 +174,7 @@ var _ = Describe("Test full application config", func() {
 				config, err := loadTestApplicationConfig(configInput)
 				Expect(err).NotTo(HaveOccurred())
 
-				_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+				_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 				Expect(err).To(MatchError(errMessage))
 				Expect(producers).To(BeNil())
 			},
@@ -192,7 +192,7 @@ var _ = Describe("Test full application config", func() {
 			config.Records = map[string][]telemetry.Dispatcher{"V": {"kinesis"}}
 
 			var err error
-			_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).To(MatchError("expected Kinesis to be configured"))
 			Expect(producers).To(BeNil())
 		})
@@ -226,15 +226,15 @@ var _ = Describe("Test full application config", func() {
 			log, _ := logrus.NoOpLogger()
 			_ = os.Setenv("PUBSUB_EMULATOR_HOST", "some_url")
 			_ = os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "some_service_account_path")
-			_, _, err := pubsubConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, _, err := pubsubConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).To(MatchError("pubsub_connect_error pubsub cannot initialize with both emulator and GCP resource"))
 		})
 
 		It("pubsub config works", func() {
 			log, _ := logrus.NoOpLogger()
 			_ = os.Setenv("PUBSUB_EMULATOR_HOST", "some_url")
 			var err error
-			_, producers, err = pubsubConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, producers, err = pubsubConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(producers["V"]).NotTo(BeNil())
 		})
@@ -253,10 +253,10 @@ var _ = Describe("Test full application config", func() {
 			log, _ := logrus.NoOpLogger()
 			config.Records = map[string][]telemetry.Dispatcher{"V": {"zmq"}}
 			var err error
-			_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, producers, err = config.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).To(MatchError("expected ZMQ to be configured"))
 			Expect(producers).To(BeNil())
-			_, producers, err = zmqConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, producers, err = zmqConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -265,7 +265,7 @@ var _ = Describe("Test full application config", func() {
 			zmqConfig.ZMQ.Addr = "tcp://127.0.0.1:5285"
 			log, _ := logrus.NoOpLogger()
 			var err error
-			_, producers, err = zmqConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log)
+			_, producers, err = zmqConfig.ConfigureProducers(airbrake.NewAirbrakeHandler(nil), log, true)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(producers["V"]).NotTo(BeNil())
 		})

datastore/googlepubsub/publisher.go

@@ -79,32 +79,38 @@ func NewProducer(prometheusEnabled bool, projectID string, namespace string, met
 	return p, nil
 }
 
+// ProvisionTopics invoked at startup to verify all relevant topics are present
+func (p *Producer) ProvisionTopics(txTypes []string) error {
+	ctx := context.Background()
+	for _, txType := range txTypes {
+		topicName := telemetry.BuildTopicName(p.namespace, txType)
+		logInfo := logrus.LogInfo{"topic_name": topicName, "txType": txType}
+		_, err := p.createTopicIfNotExists(ctx, topicName)
+		if err != nil {
+			p.ReportError("pubsub_topic_creation_error", err, logInfo)
+			metricsRegistry.notConnectedTotal.Inc(map[string]string{"record_type": txType})
+			return err
+		}
+		p.logger.ActivityLog("pubsub_topic_created", logInfo)
+	}
+	return nil
+}
+
 // Produce sends the record payload to pubsub
 func (p *Producer) Produce(entry *telemetry.Record) {
 	ctx := context.Background()
 
 	topicName := telemetry.BuildTopicName(p.namespace, entry.TxType)
+	pubsubTopic := p.pubsubClient.Topic(topicName)
 	logInfo := logrus.LogInfo{"topic_name": topicName, "txid": entry.Txid}
-	pubsubTopic, err := p.createTopicIfNotExists(ctx, topicName)
-
-	if err != nil {
-		p.ReportError("pubsub_topic_creation_error", err, logInfo)
-		metricsRegistry.notConnectedTotal.Inc(map[string]string{"record_type": entry.TxType})
-		return
-	}
-
-	if exists, err := pubsubTopic.Exists(ctx); !exists || err != nil {
-		p.ReportError("pubsub_topic_check_error", err, logInfo)
-		metricsRegistry.notConnectedTotal.Inc(map[string]string{"record_type": entry.TxType})
-		return
-	}
 
 	entry.ProduceTime = time.Now()
 	result := pubsubTopic.Publish(ctx, &pubsub.Message{
 		Data:       entry.Payload(),
 		Attributes: entry.Metadata(),
 	})
-	if _, err = result.Get(ctx); err != nil {
+
+	if _, err := result.Get(ctx); err != nil {
 		p.ReportError("pubsub_err", err, logInfo)
 		metricsRegistry.errorCount.Inc(map[string]string{"record_type": entry.TxType})
 		return