-
Notifications
You must be signed in to change notification settings - Fork 0
/
ckafka_input.go
177 lines (161 loc) · 4.43 KB
/
ckafka_input.go
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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
package main
import (
"github.com/childe/gohangout/codec"
"github.com/golang/glog"
"gopkg.in/confluentinc/confluent-kafka-go.v1/kafka"
"reflect"
)
type CkafkaInput struct {
config map[interface{}]interface{}
decorateEvents bool
messages chan *kafka.Message
decoder codec.Decoder
consumers []*kafka.Consumer
}
func New(config map[interface{}]interface{}) interface{} {
var (
codertype string = "plain"
decorateEvents = false
topics map[interface{}]interface{}
assign map[string][]int
)
consumer_settings := make(map[string]interface{})
if v, ok := config["consumer_settings"]; !ok {
glog.Fatal("kafka input must have consumer_settings")
} else {
for x, y := range v.(map[interface{}]interface{}) {
if reflect.TypeOf(y).Kind() == reflect.Map {
yy := make(map[string]interface{})
for kk, vv := range y.(map[interface{}]interface{}) {
yy[kk.(string)] = vv
}
consumer_settings[x.(string)] = yy
} else {
consumer_settings[x.(string)] = y
}
}
}
if v, ok := config["topic"]; ok {
topics = v.(map[interface{}]interface{})
} else {
topics = nil
}
if v, ok := config["assign"]; ok {
assign = make(map[string][]int)
for topicName, partitions := range v.(map[interface{}]interface{}) {
assign[topicName.(string)] = make([]int, len(partitions.([]interface{})))
for i, p := range partitions.([]interface{}) {
assign[topicName.(string)][i] = p.(int)
}
}
} else {
assign = nil
}
if topics == nil && assign == nil {
glog.Fatal("either topic or assign should be set")
}
if topics != nil && assign != nil {
glog.Fatal("topic and assign can not be both set")
}
if codecV, ok := config["codec"]; ok {
codertype = codecV.(string)
}
if decorateEventsV, ok := config["decorate_events"]; ok {
decorateEvents = decorateEventsV.(bool)
}
ckafkaInput := &CkafkaInput{
config: config,
decorateEvents: decorateEvents,
messages: make(chan *kafka.Message, 10),
decoder: codec.NewDecoder(codertype),
}
var configMap = kafka.ConfigMap{}
err := getConfigMap(consumer_settings, &configMap)
if err != nil {
glog.Fatalf("get kafka config error: %s", err)
}
// Consumer
if topics != nil {
for topic, threadCount := range topics {
for i := 0; i < threadCount.(int); i++ {
c, err := kafka.NewConsumer(&configMap)
if err != nil {
glog.Fatalf("could not init Consumer: %s", err)
}
ckafkaInput.consumers = append(ckafkaInput.consumers, c)
c.SubscribeTopics([]string{topic.(string)}, nil)
go func() {
for {
msg, err := c.ReadMessage(-1)
if err == nil {
ckafkaInput.messages <- msg
} else {
// The client will automatically try to recover from all errors.
glog.Errorf("Consumer error: %v (%v)\n", err, msg)
}
}
}()
}
}
} else {
c, err := kafka.NewConsumer(&configMap)
if err != nil {
glog.Fatalf("could not init SimpleConsumer: %s", err)
}
ckafkaInput.consumers = append(ckafkaInput.consumers, c)
var TopicPartitions kafka.TopicPartitions
for topic, partitions := range assign {
for _, partition := range partitions {
topicPartition := kafka.TopicPartition{Topic: &topic, Partition: int32(partition)}
TopicPartitions = append(TopicPartitions, topicPartition)
}
}
c.Assign(TopicPartitions)
go func() {
for {
msg, err := c.ReadMessage(-1)
if err == nil {
ckafkaInput.messages <- msg
} else {
// The client will automatically try to recover from all errors.
glog.Errorf("Consumer error: %v (%v)\n", err, msg)
}
}
}()
}
return ckafkaInput
}
func (p *CkafkaInput) ReadOneEvent() map[string]interface{} {
message := <-p.messages
topicPartition := message.TopicPartition
err := topicPartition.Error
if err != nil {
glog.Error(err)
return nil
}
event := p.decoder.Decode(message.Value)
if p.decorateEvents {
kafkaMeta := make(map[string]interface{})
kafkaMeta["topic"] = topicPartition.Topic
kafkaMeta["partition"] = topicPartition.Partition
kafkaMeta["offset"] = topicPartition.Offset
event["@metadata"] = map[string]interface{}{"kafka": kafkaMeta}
}
return event
}
func getConfigMap(config map[string]interface{}, configMap *kafka.ConfigMap) error {
for key, value := range config {
err := configMap.SetKey(key, value)
if err != nil {
return err
}
}
return nil
}
func (p *CkafkaInput) Shutdown() {
if len(p.consumers) > 0 {
for _, c := range p.consumers {
c.Close()
}
}
}