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https://github.com/open-telemetry/opentelemetry-go.git
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15bfc5bb12
Also fixes example module paths so that they use the vanity URL instead of the github URL. [Closes #184]
48 lines
1.4 KiB
Go
48 lines
1.4 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 foo
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import (
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"context"
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"go.opentelemetry.io/otel/api/key"
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"go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/global"
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)
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var (
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lemonsKey = key.New("ex.com/lemons")
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)
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// SubOperation is an example to demonstrate the use of named tracer.
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// It creates a named tracer with its package path.
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func SubOperation(ctx context.Context) error {
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// Using global provider. Alternative is to have application provide a getter
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// for its component to get the instance of the provider.
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tr := global.TraceProvider().GetTracer("example/namedtracer/foo")
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return tr.WithSpan(
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ctx,
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"Sub operation...",
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func(ctx context.Context) error {
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trace.CurrentSpan(ctx).SetAttribute(lemonsKey.String("five"))
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trace.CurrentSpan(ctx).AddEvent(ctx, "Sub span event")
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return nil
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},
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)
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}
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