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opentelemetry-go/bridge/opencensus/internal/tracer.go
Tyler Yahn d18c135f58
Add OpenCensus bridge internal package (#2146)
* Add internal pkg to bridge/opencensus

* Use the bridge/opencensus/internal pkg

* Correct testing comments

* Remove added unit tests
2021-08-06 08:44:07 -07:00

70 lines
2.5 KiB
Go

// Copyright The 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 internal
import (
"context"
"fmt"
octrace "go.opencensus.io/trace"
"go.opentelemetry.io/otel/bridge/opencensus/internal/oc2otel"
"go.opentelemetry.io/otel/trace"
)
// Tracer is an OpenCensus Tracer that wraps an OpenTelemetry Tracer.
type Tracer struct {
otelTracer trace.Tracer
}
// NewTracer returns an OpenCensus Tracer that wraps the OpenTelemetry tracer.
func NewTracer(tracer trace.Tracer) octrace.Tracer {
return &Tracer{otelTracer: tracer}
}
// StartSpan starts a new child span of the current span in the context. If
// there is no span in the context, it creates a new trace and span.
func (o *Tracer) StartSpan(ctx context.Context, name string, s ...octrace.StartOption) (context.Context, *octrace.Span) {
otelOpts, err := oc2otel.StartOptions(s)
if err != nil {
Handle(fmt.Errorf("starting span %q: %w", name, err))
}
ctx, sp := o.otelTracer.Start(ctx, name, otelOpts...)
return ctx, NewSpan(sp)
}
// StartSpanWithRemoteParent starts a new child span of the span from the
// given parent.
func (o *Tracer) StartSpanWithRemoteParent(ctx context.Context, name string, parent octrace.SpanContext, s ...octrace.StartOption) (context.Context, *octrace.Span) {
// make sure span context is zero'd out so we use the remote parent
ctx = trace.ContextWithSpan(ctx, nil)
ctx = trace.ContextWithRemoteSpanContext(ctx, oc2otel.SpanContext(parent))
return o.StartSpan(ctx, name, s...)
}
// FromContext returns the Span stored in a context.
func (o *Tracer) FromContext(ctx context.Context) *octrace.Span {
return NewSpan(trace.SpanFromContext(ctx))
}
// NewContext returns a new context with the given Span attached.
func (o *Tracer) NewContext(parent context.Context, s *octrace.Span) context.Context {
if otSpan, ok := s.Internal().(*Span); ok {
return trace.ContextWithSpan(parent, otSpan.otelSpan)
}
Handle(fmt.Errorf("unable to create context with span %q, since it was created using a different tracer", s.String()))
return parent
}