1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
// Example channel-based high-level Apache Kafka consumer
package main
/**
* Copyright 2016 Confluent Inc.
*
* Licensed 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.
*/
import (
"fmt"
"github.com/confluentinc/confluent-kafka-go/kafka"
"os"
"os/signal"
"syscall"
)
func main() {
if len(os.Args) < 4 {
fmt.Fprintf(os.Stderr, "Usage: %s <broker> <group> <topics..>\n",
os.Args[0])
os.Exit(1)
}
broker := os.Args[1]
group := os.Args[2]
topics := os.Args[3:]
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, syscall.SIGINT, syscall.SIGTERM)
c, err := kafka.NewConsumer(&kafka.ConfigMap{
"bootstrap.servers": broker,
"group.id": group,
"session.timeout.ms": 6000,
"go.events.channel.enable": true,
"go.application.rebalance.enable": true,
"default.topic.config": kafka.ConfigMap{"auto.offset.reset": "earliest"}})
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create consumer: %s\n", err)
os.Exit(1)
}
fmt.Printf("Created Consumer %v\n", c)
err = c.SubscribeTopics(topics, nil)
run := true
for run == true {
select {
case sig := <-sigchan:
fmt.Printf("Caught signal %v: terminating\n", sig)
run = false
case ev := <-c.Events():
switch e := ev.(type) {
case kafka.AssignedPartitions:
fmt.Fprintf(os.Stderr, "%% %v\n", e)
c.Assign(e.Partitions)
case kafka.RevokedPartitions:
fmt.Fprintf(os.Stderr, "%% %v\n", e)
c.Unassign()
case *kafka.Message:
fmt.Printf("%% Message on %s:\n%s\n",
e.TopicPartition, string(e.Value))
case kafka.PartitionEOF:
fmt.Printf("%% Reached %v\n", e)
case kafka.Error:
fmt.Fprintf(os.Stderr, "%% Error: %v\n", e)
run = false
}
}
}
fmt.Printf("Closing consumer\n")
c.Close()
}
|
