sijie commented on a change in pull request #3854: [issue #3767] support go function for pulsar URL: https://github.com/apache/pulsar/pull/3854#discussion_r266859429
########## File path: pulsar-function-go/pf/instance.go ########## @@ -0,0 +1,256 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 pf + +import ( + "context" + "time" + + "github.com/apache/pulsar/pulsar-client-go/pulsar" + "github.com/apache/pulsar/pulsar-function-go/log" + "github.com/apache/pulsar/pulsar-function-go/pb" +) + +type GoInstance struct { + function Function + context *FunctionContext + producer pulsar.Producer + consumers map[string]pulsar.Consumer + client pulsar.Client +} + +// NewGoInstance init GoInstance and init function context +func NewGoInstance() *GoInstance { + goInstance := &GoInstance{ + context: NewFuncContext(), + consumers: make(map[string]pulsar.Consumer), + } + return goInstance +} + +func (gi *GoInstance) StartFunction(function Function) { + gi.function = function + gi.setupClient() + err := gi.setupProducer() + if err != nil { + log.Errorf("setup producer failed, error is:%s", err.Error()) + } + channel := gi.setupConsumer() + +CLOSE: + for { + select { + case cm := <-channel: + msgInput := cm.Message + output, err := gi.handlerMsg(msgInput) + if err != nil { + log.Errorf("handler message error:%v", err) + } + err = gi.processResult(msgInput, output) + if err != nil { + log.Errorf("process result error:%v", err) + } + case <-time.After(time.Millisecond * gi.context.InstanceConf.KillAfterIdleMs): + close(channel) + break CLOSE + } + } + + gi.close() +} + +func (gi *GoInstance) setupClient() { + client, err := pulsar.NewClient(pulsar.ClientOptions{ + URL: gi.context.InstanceConf.PulsarServiceURL, + }) + if err != nil { + log.Errorf("create client error:%v", err) + return + } + gi.client = client +} + +func (gi *GoInstance) setupProducer() (err error) { + if gi.client == nil { + gi.setupClient() + } + + if gi.context.InstanceConf.FuncDetails.Sink.Topic != "" && len(gi.context.InstanceConf.FuncDetails.Sink.Topic) > 0 { + log.Debugf("Setting up producer for topic %s", gi.context.InstanceConf.FuncDetails.Sink.Topic) + properties := getProperties(getDefaultSubscriptionName( + gi.context.InstanceConf.FuncDetails.Tenant, + gi.context.InstanceConf.FuncDetails.Namespace, + gi.context.InstanceConf.FuncDetails.Name), gi.context.InstanceConf.InstanceID) + gi.producer, err = gi.client.CreateProducer(pulsar.ProducerOptions{ + Topic: gi.context.InstanceConf.FuncDetails.Sink.Topic, + Properties: properties, + CompressionType: pulsar.LZ4, + BlockIfQueueFull: true, + Batching: true, + BatchingMaxPublishDelay: time.Millisecond * 10, + // set send timeout to be infinity to prevent potential deadlock with consumer + // that might happen when consumer is blocked due to unacked messages + SendTimeout: 0, + }) + if err != nil { + log.Errorf("create producer error:%s", err.Error()) + } + return err + } + return nil +} + +func (gi *GoInstance) setupConsumer() chan pulsar.ConsumerMessage { + subscriptionType := pulsar.Shared + if int32(gi.context.InstanceConf.FuncDetails.Source.SubscriptionType) == pb.SubscriptionType_value["FAILOVER"] { + subscriptionType = pulsar.Failover + } + + funcDetails := gi.context.InstanceConf.FuncDetails + subscriptionName := funcDetails.Tenant + "/" + funcDetails.Namespace + "/" + funcDetails.Name + + properties := getProperties(getDefaultSubscriptionName( + funcDetails.Tenant, + funcDetails.Namespace, + funcDetails.Name), gi.context.InstanceConf.InstanceID) + + channel := make(chan pulsar.ConsumerMessage) + + var ( + consumer pulsar.Consumer + err error + ) + + for topic, consumerConf := range funcDetails.Source.InputSpecs { + log.Debugf("Setting up consumer for topic: %s with subscription name: %s", topic, subscriptionName) + if consumerConf.ReceiverQueueSize != nil { + if consumerConf.IsRegexPattern { + consumer, err = gi.client.Subscribe(pulsar.ConsumerOptions{ + TopicsPattern: topic, + ReceiverQueueSize: int(consumerConf.ReceiverQueueSize.Value), + SubscriptionName: subscriptionName, + Properties: properties, + Type: subscriptionType, + MessageChannel: channel, + }) + } else { + consumer, err = gi.client.Subscribe(pulsar.ConsumerOptions{ + Topic: topic, + SubscriptionName: subscriptionName, + Properties: properties, + Type: subscriptionType, + ReceiverQueueSize: int(consumerConf.ReceiverQueueSize.Value), + MessageChannel: channel, + }) + } + } else { + if consumerConf.IsRegexPattern { + consumer, err = gi.client.Subscribe(pulsar.ConsumerOptions{ + TopicsPattern: topic, + SubscriptionName: subscriptionName, + Properties: properties, + Type: subscriptionType, + MessageChannel: channel, + }) + } else { + consumer, err = gi.client.Subscribe(pulsar.ConsumerOptions{ + Topic: topic, + SubscriptionName: subscriptionName, + Properties: properties, + Type: subscriptionType, + MessageChannel: channel, + }) + + } + } + + if err != nil { + log.Errorf("create consumer error:%s", err.Error()) + } + gi.consumers[topic] = consumer + } + return channel +} + +func (gi *GoInstance) handlerMsg(input pulsar.Message) (output []byte, err error) { + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + ctx = NewContext(ctx, gi.context) + msgInput := input.Payload() + output, err = gi.function.Process(ctx, msgInput) Review comment: `return gi.function.Process(ctx, msgInput)` and let the caller handle the error. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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