-
Notifications
You must be signed in to change notification settings - Fork 23
/
websocketclient.go
150 lines (133 loc) · 4.65 KB
/
websocketclient.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
// Copyright 2018 StreamSets 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.
package websocketclient
import (
"bytes"
"fmt"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
"github.com/streamsets/datacollector-edge/api"
"github.com/streamsets/datacollector-edge/api/validation"
"github.com/streamsets/datacollector-edge/container/common"
"github.com/streamsets/datacollector-edge/stages/lib/dataparser"
"github.com/streamsets/datacollector-edge/stages/lib/httpcommon"
"github.com/streamsets/datacollector-edge/stages/stagelibrary"
"net/http"
)
const (
Library = "streamsets-datacollector-basic-lib"
StageName = "com_streamsets_pipeline_stage_origin_websocket_WebSocketClientDSource"
ConnectionClosedError = "connection closed, code: %d, message: %s"
)
var defaultOffset = "webSocket"
type Origin struct {
*common.BaseStage
Conf OriginClientConfig `ConfigDefBean:"conf"`
incomingRecords chan api.Record
webSocketConn *websocket.Conn
destroyed chan bool
}
type OriginClientConfig struct {
ResourceUrl string `ConfigDef:"type=STRING,required=true"`
Headers map[string]string `ConfigDef:"type=MAP,required=true"`
RequestBody string `ConfigDef:"type=STRING,required=true"`
BasicAuth httpcommon.PasswordAuthConfigBean `ConfigDefBean:"basicAuth"`
DataFormat string `ConfigDef:"type=STRING,required=true"`
DataFormatConfig dataparser.DataParserFormatConfig `ConfigDefBean:"dataFormatConfig"`
}
func init() {
stagelibrary.SetCreator(Library, StageName, func() api.Stage {
return &Origin{BaseStage: &common.BaseStage{}}
})
}
func (o *Origin) Init(stageContext api.StageContext) []validation.Issue {
issues := o.BaseStage.Init(stageContext)
o.incomingRecords = make(chan api.Record)
issues = o.Conf.DataFormatConfig.Init(o.Conf.DataFormat, stageContext, issues)
o.destroyed = make(chan bool)
if len(issues) == 0 {
// Initialize WebSocket connection
requestHeader := http.Header{}
for key, value := range o.Conf.Headers {
requestHeader.Set(key, value)
}
var err error
o.webSocketConn, _, err = websocket.DefaultDialer.Dial(o.Conf.ResourceUrl, requestHeader)
if err != nil {
issues = append(issues, stageContext.CreateConfigIssue(err.Error()))
return issues
}
o.webSocketConn.SetCloseHandler(o.closeHandler)
if len(o.Conf.RequestBody) > 0 {
o.webSocketConn.WriteMessage(websocket.TextMessage, []byte(o.Conf.RequestBody))
}
go o.messageHandler()
}
return issues
}
func (o *Origin) Produce(lastSourceOffset *string, maxBatchSize int, batchMaker api.BatchMaker) (*string, error) {
record := <-o.incomingRecords
if record != nil {
batchMaker.AddRecord(record)
}
return &defaultOffset, nil
}
func (o *Origin) Destroy() error {
log.Debug("WebSocket Client Origin Destroy method")
if o.webSocketConn != nil {
o.webSocketConn.Close()
}
o.destroyed <- true
return nil
}
func (o *Origin) messageHandler() {
for {
select {
case <-o.destroyed:
log.Debug("WebSocket Client Origin destroyed channel called")
return
default:
_, message, err := o.webSocketConn.ReadMessage()
if err != nil {
o.GetStageContext().ReportError(err)
}
o.processMessage(message)
}
}
}
func (o *Origin) processMessage(message []byte) {
recordReaderFactory := o.Conf.DataFormatConfig.RecordReaderFactory
recordBuffer := bytes.NewBuffer(message)
recordReader, err := recordReaderFactory.CreateReader(o.GetStageContext(), recordBuffer, "webSocket")
if err != nil {
o.GetStageContext().ReportError(err)
log.WithError(err).Error("Failed to create record reader")
}
defer recordReader.Close()
for {
record, err := recordReader.ReadRecord()
if err != nil {
o.GetStageContext().ReportError(err)
log.WithError(err).Error("Failed to parse raw data")
}
if record == nil {
break
}
o.incomingRecords <- record
}
}
func (o *Origin) closeHandler(code int, message string) error {
log.WithField("code", code).WithField("message", message).Error("Connection Closed")
o.GetStageContext().ReportError(fmt.Errorf(ConnectionClosedError, code, message))
return nil
}