tydhot commented on a change in pull request #300: URL: https://github.com/apache/dubbo-go-pixiu/pull/300#discussion_r753803615
########## File path: pkg/client/mq/kafka_facade.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 mq + +import ( + "bytes" + "context" + "encoding/json" + "fmt" + "net/http" + "strconv" + "sync" + "time" +) + +import ( + "github.com/apache/dubbo-go-pixiu/pkg/logger" +) + +import ( + "github.com/Shopify/sarama" + perrors "github.com/pkg/errors" +) + +type kafkaErrors struct { + count int + err string +} + +func (ke kafkaErrors) Error() string { + return fmt.Sprintf("Failed to deliver %d messages due to %s", ke.count, ke.err) +} + +func NewKafkaConsumerFacade(config KafkaConsumerConfig, consumerGroup string) (*KafkaConsumerFacade, error) { + c := sarama.NewConfig() + c.ClientID = config.ClientID + c.Metadata.Full = config.Metadata.Full + c.Metadata.Retry.Max = config.Metadata.Retry.Max + c.Metadata.Retry.Backoff = config.Metadata.Retry.Backoff + if config.ProtocolVersion != "" { + version, err := sarama.ParseKafkaVersion(config.ProtocolVersion) + if err != nil { + return nil, err + } + c.Version = version + } + client, err := sarama.NewConsumerGroup(config.Brokers, consumerGroup, c) + if err != nil { + return nil, err + } + + return &KafkaConsumerFacade{consumerGroup: client, httpClient: &http.Client{Timeout: 5 * time.Second}, done: make(chan struct{})}, nil +} + +type KafkaConsumerFacade struct { + consumerGroup sarama.ConsumerGroup + consumerManager map[string]func() + httpClient *http.Client + wg sync.WaitGroup + done chan struct{} +} + +func (f *KafkaConsumerFacade) Subscribe(ctx context.Context, opts ...Option) error { + cOpt := DefaultOptions() + cOpt.ApplyOpts(opts...) + c, cancel := context.WithCancel(ctx) + key := GetConsumerManagerKey(cOpt.TopicList, cOpt.ConsumerGroup) + f.consumerManager[key] = cancel + f.wg.Add(2) + go f.consumeLoop(ctx, cOpt.TopicList, &consumerGroupHandler{cOpt.ConsumeUrl, f.httpClient}) + go f.checkConsumerIsAlive(c, key, cOpt.CheckUrl) + return nil +} + +func (f *KafkaConsumerFacade) consumeLoop(ctx context.Context, topics []string, handler sarama.ConsumerGroupHandler) { + for { + if _, ok := <-f.done; ok { + logger.Info("shutdown the consume loop") + break + } + if err := f.consumerGroup.Consume(ctx, topics, handler); err != nil { + logger.Warn("failed to consume the msg from kafka, %s", err.Error()) + } + if ctx.Err() != nil { + // log consume stop + logger.Error("shutdown the consume loop due to %s", ctx.Err().Error()) + break + } + } +} + +type consumerGroupHandler struct { + consumerUrl string + httpClient *http.Client +} + +func (c *consumerGroupHandler) Setup(session sarama.ConsumerGroupSession) error { + return nil +} + +func (c *consumerGroupHandler) Cleanup(session sarama.ConsumerGroupSession) error { + return nil +} + +func (c *consumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error { + for msg := range claim.Messages() { + session.MarkMessage(msg, "") + data, err := json.Marshal(MQMsgPush{Msg: []string{string(msg.Value)}}) + if err != nil { + logger.Warn() + continue + } + + req, err := http.NewRequest(http.MethodPost, c.consumerUrl, bytes.NewReader(data)) + if err != nil { + logger.Warn() + continue + } + err = func() error { + resp, err := c.httpClient.Do(req) + if err != nil { + return err + } + defer resp.Body.Close() + + if resp.StatusCode == http.StatusOK { + return nil + } + return perrors.New("failed send msg to consumer") + }() + if err != nil { + logger.Warn(err.Error()) + } + } + return nil +} + +// checkConsumerIsAlive make sure consumer is alive or would be removed from consumer list +func (f *KafkaConsumerFacade) checkConsumerIsAlive(ctx context.Context, key string, checkUrl string) { + defer f.wg.Done() + + ticker := time.NewTicker(15 * time.Second) + for { + select { + case <-f.done: + logger.Info() Review comment: ok -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
