/
stdout.go
68 lines (60 loc) · 1.86 KB
/
stdout.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
// Copyright 2019, OpenTelemetry Authors
//
// 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 stdout
import (
"context"
"encoding/json"
"io"
"os"
export "go.opentelemetry.io/otel/sdk/export/trace"
)
// Options are the options to be used when initializing a stdout export.
type Options struct {
// Writer is the destination. If not set, os.Stdout is used.
Writer io.Writer
// PrettyPrint will pretty the json representation of the span,
// making it print "pretty". Default is false.
PrettyPrint bool
}
// Exporter is an implementation of trace.Exporter that writes spans to stdout.
type Exporter struct {
pretty bool
outputWriter io.Writer
}
func NewExporter(o Options) (*Exporter, error) {
if o.Writer == nil {
o.Writer = os.Stdout
}
return &Exporter{
pretty: o.PrettyPrint,
outputWriter: o.Writer,
}, nil
}
// ExportSpan writes a SpanData in json format to stdout.
func (e *Exporter) ExportSpan(ctx context.Context, data *export.SpanData) {
var jsonSpan []byte
var err error
if e.pretty {
jsonSpan, err = json.MarshalIndent(data, "", "\t")
} else {
jsonSpan, err = json.Marshal(data)
}
if err != nil {
// ignore writer failures for now
_, _ = e.outputWriter.Write([]byte("Error converting spanData to json: " + err.Error()))
return
}
// ignore writer failures for now
_, _ = e.outputWriter.Write(append(jsonSpan, byte('\n')))
}