2019-09-28 20:27:02 +02:00
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// Copyright 2019, OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stdout
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import (
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2019-10-08 20:56:58 +02:00
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"context"
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"encoding/json"
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"io"
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"os"
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2019-10-17 00:13:39 +02:00
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"sync"
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2019-10-31 00:01:19 +02:00
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"time"
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2019-10-31 00:01:19 +02:00
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"google.golang.org/grpc/codes"
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2019-11-01 20:40:29 +02:00
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"go.opentelemetry.io/otel/api/core"
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apitrace "go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/sdk/export"
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"go.opentelemetry.io/otel/sdk/trace"
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)
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// Options are the options to be used when initializing a stdout export.
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type Options struct {
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// PrettyPrint will pretty the json representation of the span,
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// making it print "pretty". Default is false.
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PrettyPrint bool
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}
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// Exporter is an implementation of trace.Exporter that writes spans to stdout.
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type Exporter struct {
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once sync.Once
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pretty bool
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outputWriter io.Writer
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}
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func NewExporter(o Options) (*Exporter, error) {
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return &Exporter{
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pretty: o.PrettyPrint,
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outputWriter: os.Stdout,
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}, nil
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}
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2019-10-17 00:13:39 +02:00
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// RegisterSimpleSpanProcessor registers e as SimpleSpanProcessor.
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func (e *Exporter) RegisterSimpleSpanProcessor() {
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e.once.Do(func() {
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ssp := trace.NewSimpleSpanProcessor(e)
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trace.RegisterSpanProcessor(ssp)
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})
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}
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type jsonValue struct {
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Type string
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Value interface{}
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}
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type jsonKeyValue struct {
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Key core.Key
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Value jsonValue
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}
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type jsonSpanData struct {
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SpanContext core.SpanContext
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ParentSpanID core.SpanID
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SpanKind apitrace.SpanKind
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Name string
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StartTime time.Time
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EndTime time.Time
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Attributes []jsonKeyValue
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MessageEvents []export.Event
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Links []apitrace.Link
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Status codes.Code
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HasRemoteParent bool
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DroppedAttributeCount int
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DroppedMessageEventCount int
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DroppedLinkCount int
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ChildSpanCount int
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}
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func marshalSpanData(data *export.SpanData, pretty bool) ([]byte, error) {
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jsd := jsonSpanData{
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SpanContext: data.SpanContext,
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ParentSpanID: data.ParentSpanID,
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SpanKind: data.SpanKind,
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Name: data.Name,
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StartTime: data.StartTime,
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EndTime: data.EndTime,
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Attributes: toJSONAttributes(data.Attributes),
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MessageEvents: data.MessageEvents,
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Links: data.Links,
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Status: data.Status,
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HasRemoteParent: data.HasRemoteParent,
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DroppedAttributeCount: data.DroppedAttributeCount,
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DroppedMessageEventCount: data.DroppedMessageEventCount,
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DroppedLinkCount: data.DroppedLinkCount,
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ChildSpanCount: data.ChildSpanCount,
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}
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if pretty {
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return json.MarshalIndent(jsd, "", "\t")
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}
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return json.Marshal(jsd)
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}
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func toJSONAttributes(attributes []core.KeyValue) []jsonKeyValue {
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jsonAttrs := make([]jsonKeyValue, len(attributes))
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for i := 0; i < len(attributes); i++ {
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jsonAttrs[i].Key = attributes[i].Key
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jsonAttrs[i].Value.Type = attributes[i].Value.Type().String()
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jsonAttrs[i].Value.Value = attributes[i].Value.AsInterface()
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}
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return jsonAttrs
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}
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// ExportSpan writes a SpanData in json format to stdout.
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func (e *Exporter) ExportSpan(ctx context.Context, data *export.SpanData) {
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jsonSpan, err := marshalSpanData(data, e.pretty)
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if err != nil {
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// ignore writer failures for now
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_, _ = e.outputWriter.Write([]byte("Error converting spanData to json: " + err.Error()))
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return
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}
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// ignore writer failures for now
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_, _ = e.outputWriter.Write(append(jsonSpan, byte('\n')))
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}
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