-
Notifications
You must be signed in to change notification settings - Fork 1
/
json_writer.go
137 lines (127 loc) · 3.7 KB
/
json_writer.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
// 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 jsonrecord
import (
"encoding/json"
"github.com/spf13/cast"
"github.com/streamsets/datacollector-edge/api"
"github.com/streamsets/datacollector-edge/api/dataformats"
"github.com/streamsets/datacollector-edge/api/fieldtype"
"github.com/streamsets/datacollector-edge/api/linkedhashmap"
"github.com/streamsets/datacollector-edge/container/recordio"
"github.com/streamsets/datacollector-edge/container/util"
"io"
"time"
)
const (
ArrayObjects = "ARRAY_OBJECTS"
MultipleObjects = "MULTIPLE_OBJECTS"
)
type JsonWriterFactoryImpl struct {
Mode string
}
func (j *JsonWriterFactoryImpl) CreateWriter(
context api.StageContext,
writer io.Writer,
) (dataformats.RecordWriter, error) {
return newRecordWriter(context, writer, j.Mode), nil
}
type JsonWriterImpl struct {
context api.StageContext
writer io.Writer
encoder *json.Encoder
isArray bool
arrayRecords []interface{}
}
func (jsonWriter *JsonWriterImpl) WriteRecord(r api.Record) error {
recordValue, _ := r.Get()
jsonObject, err := writeFieldToJsonObject(recordValue)
if err != nil {
return err
}
if jsonWriter.isArray {
jsonWriter.arrayRecords = append(jsonWriter.arrayRecords, jsonObject)
} else {
jsonWriter.encoder.Encode(jsonObject)
}
return nil
}
func (jsonWriter *JsonWriterImpl) Flush() error {
return recordio.Flush(jsonWriter.writer)
}
func (jsonWriter *JsonWriterImpl) Close() error {
if jsonWriter.isArray {
jsonWriter.encoder.Encode(jsonWriter.arrayRecords)
recordio.Flush(jsonWriter.writer)
}
return recordio.Close(jsonWriter.writer)
}
func newRecordWriter(context api.StageContext, writer io.Writer, mode string) *JsonWriterImpl {
jsonWriter := &JsonWriterImpl{
context: context,
writer: writer,
encoder: json.NewEncoder(writer),
isArray: mode == ArrayObjects,
}
if jsonWriter.isArray {
jsonWriter.arrayRecords = make([]interface{}, 0)
}
return jsonWriter
}
func writeFieldToJsonObject(field *api.Field) (interface{}, error) {
if field.Value == nil {
return nil, nil
}
var err error = nil
switch field.Type {
case fieldtype.LIST:
jsonObject := make([]interface{}, 0)
fieldValue := field.Value.([]*api.Field)
for _, v := range fieldValue {
fieldJsonObject, err := writeFieldToJsonObject(v)
if err != nil {
return nil, err
}
jsonObject = append(jsonObject, fieldJsonObject)
}
return jsonObject, err
case fieldtype.MAP:
jsonObject := make(map[string]interface{})
fieldValue := field.Value.(map[string]*api.Field)
for k, v := range fieldValue {
jsonObject[k], err = writeFieldToJsonObject(v)
if err != nil {
return nil, err
}
}
return jsonObject, err
case fieldtype.LIST_MAP:
jsonObject := make(map[string]interface{})
listMapValue := field.Value.(*linkedhashmap.Map)
it := listMapValue.Iterator()
for it.HasNext() {
entry := it.Next()
key := entry.GetKey()
value := entry.GetValue().(*api.Field)
jsonObject[cast.ToString(key)], err = writeFieldToJsonObject(value)
if err != nil {
return nil, err
}
}
return jsonObject, err
case fieldtype.DATETIME:
return util.ConvertTimeToLong(field.Value.(time.Time)), nil
default:
return field.Value, nil
}
}