使用Kafka和MongoDB进行Go异步处理

kafka-to-mongo/kafka-mongo-sample.go

func main() {
 
    //Create MongoDB session
    session := initialiseMongo()
    mongoStore.session = session
 
    receiveFromKafka()
 
}
 
func receiveFromKafka() {
 
    fmt.Println("Start receiving from Kafka")
    c, err := kafka.NewConsumer(&kafka.ConfigMap{
        "bootstrap.servers": "localhost:9092",
        "group.id":          "group-id-1",
        "auto.offset.reset": "earliest",
    })
 
    if err != nil {
        panic(err)
    }
 
    c.SubscribeTopics([]string{"jobs-topic1"}, nil)
 
    for {
        msg, err := c.ReadMessage(-1)
 
        if err == nil {
            fmt.Printf("Received from Kafka %s: %sn", msg.TopicPartition, string(msg.Value))
            job := string(msg.Value)
            saveJobToMongo(job)
        } else {
            fmt.Printf("Consumer error: %v (%v)n", err, msg)
            break
        }
    }
 
    c.Close()
 
}
 
func saveJobToMongo(jobString string) {
 
    fmt.Println("Save to MongoDB")
    col := mongoStore.session.DB(database).C(collection)
 
    //Save data into Job struct
    var _job Job
    b := []byte(jobString)
    err := json.Unmarshal(b, &_job)
    if err != nil {
        panic(err)
    }
 
    //Insert job into MongoDB
    errMongo := col.Insert(_job)
    if errMongo != nil {
        panic(errMongo)
    }
 
    fmt.Printf("Saved to MongoDB : %s", jobString)
 
}

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