forked from linkedin/goavro
-
Notifications
You must be signed in to change notification settings - Fork 0
/
writer.go
112 lines (104 loc) · 2.79 KB
/
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
// Copyright 2015 LinkedIn Corp. 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.Copyright [201X] LinkedIn Corp. 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.
package main
import (
"fmt"
"github.com/linkedin/goavro"
"io"
"log"
"os"
)
var (
schema string
codec goavro.Codec
)
func init() {
schema = `
{
"type" : "record",
"name" : "Weather",
"namespace" : "test",
"doc" : "A weather reading.",
"fields" : [ {
"name" : "station",
"type" : "string"
}, {
"name" : "time",
"type" : "long"
}, {
"name" : "temp",
"type" : "int"
} ]
}
`
var err error
// If you want speed, create the codec one time for each
// schema and reuse it to create multiple Writer instances.
codec, err = goavro.NewCodec(schema)
if err != nil {
log.Fatal(err)
}
}
func main() {
switch len(os.Args) {
case 1:
dumpWriter(os.Stdout, codec)
case 2:
fh, err := os.Create(os.Args[1])
if err != nil {
log.Fatal(err)
}
dumpWriter(fh, codec)
fh.Close()
default:
fmt.Fprintf(os.Stderr, "usage: %s [filename]\n", os.Args[0])
os.Exit(2)
}
}
func dumpWriter(w io.Writer, codec goavro.Codec) {
fw, err := codec.NewWriter(
// goavro.Compression(goavro.CompressionDeflate),
goavro.Compression(goavro.CompressionSnappy),
goavro.ToWriter(w))
if err != nil {
log.Fatal(err)
}
defer func() {
err := fw.Close()
if err != nil {
log.Fatal(err)
}
}()
raw := []map[string]interface{}{
{"station": "011990-99999", "time": int64(-619524000000), "temp": int32(0)},
{"station": "011990-99999", "time": int64(-619506000000), "temp": int32(22)},
{"station": "011990-99999", "time": int64(-619484400000), "temp": int32(-11)},
{"station": "012650-99999", "time": int64(-655531200000), "temp": int32(111)},
{"station": "012650-99999", "time": int64(-655509600000), "temp": int32(78)},
}
for _, rec := range raw {
record, err := goavro.NewRecord(goavro.RecordSchema(schema))
if err != nil {
log.Fatal(err)
}
for k, v := range rec {
record.Set(k, v)
}
fw.Write(record)
}
}