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0eb73325ce
* rename finish -> end * missed a few finish -> end spots * change end back to finish for the bridge span in the openTracing bridge * fixed grammar, ran make
130 lines
3.3 KiB
Go
130 lines
3.3 KiB
Go
// 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 sdk
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import (
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"context"
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"math/rand"
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"go.opentelemetry.io/api/core"
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"go.opentelemetry.io/api/key"
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"go.opentelemetry.io/api/trace"
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"go.opentelemetry.io/experimental/streaming/exporter"
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)
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type tracer struct {
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exporter *exporter.Exporter
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resources exporter.EventID
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}
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var (
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// TODO These should move somewhere in the api, right?
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ServiceKey = key.New("service")
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ComponentKey = key.New("component")
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ErrorKey = key.New("error")
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SpanIDKey = key.New("span_id")
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TraceIDKey = key.New("trace_id")
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MessageKey = key.New("message")
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)
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func New(observers ...exporter.Observer) trace.Tracer {
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return &tracer{
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exporter: exporter.NewExporter(observers...),
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}
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}
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func (t *tracer) WithResources(attributes ...core.KeyValue) trace.Tracer {
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s := t.exporter.NewScope(exporter.ScopeID{
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EventID: t.resources,
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}, attributes...)
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return &tracer{
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exporter: t.exporter,
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resources: s.EventID,
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}
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}
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func (t *tracer) WithComponent(name string) trace.Tracer {
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return t.WithResources(ComponentKey.String(name))
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}
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func (t *tracer) WithService(name string) trace.Tracer {
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return t.WithResources(ServiceKey.String(name))
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}
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func (t *tracer) WithSpan(ctx context.Context, name string, body func(context.Context) error) error {
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// TODO: use runtime/trace.WithRegion for execution tracer support
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// TODO: use runtime/pprof.Do for profile tags support
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ctx, span := t.Start(ctx, name)
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defer span.End()
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if err := body(ctx); err != nil {
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span.SetAttribute(ErrorKey.Bool(true))
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span.AddEvent(ctx, "span error", MessageKey.String(err.Error()))
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return err
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}
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return nil
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}
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func (t *tracer) Start(ctx context.Context, name string, opts ...trace.SpanOption) (context.Context, trace.Span) {
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var child core.SpanContext
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child.SpanID = rand.Uint64()
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o := &trace.SpanOptions{}
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for _, opt := range opts {
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opt(o)
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}
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var parentScope exporter.ScopeID
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if o.Reference.HasTraceID() {
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parentScope.SpanContext = o.Reference.SpanContext
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} else {
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parentScope.SpanContext = trace.CurrentSpan(ctx).SpanContext()
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}
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if parentScope.HasTraceID() {
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parent := parentScope.SpanContext
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child.TraceID.High = parent.TraceID.High
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child.TraceID.Low = parent.TraceID.Low
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} else {
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child.TraceID.High = rand.Uint64()
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child.TraceID.Low = rand.Uint64()
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}
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childScope := exporter.ScopeID{
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SpanContext: child,
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EventID: t.resources,
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}
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span := &span{
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tracer: t,
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initial: exporter.ScopeID{
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SpanContext: child,
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EventID: t.exporter.Record(exporter.Event{
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Time: o.StartTime,
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Type: exporter.START_SPAN,
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Scope: t.exporter.NewScope(childScope, o.Attributes...),
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Context: ctx,
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Parent: parentScope,
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String: name,
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},
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),
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},
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}
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return trace.SetCurrentSpan(ctx, span), span
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}
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