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opentelemetry-go/sdk/trace/examples_test.go

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// 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 trace_test
import (
"context"
"fmt"
"go.opentelemetry.io/api/trace"
)
// This example shows how to use trace.Start and (*Span).End to capture
// a function execution in a Span. It assumes that the function
// has a context.Context argument.
func ExampleStart() {
printEvens := func(ctx context.Context) {
_, span := trace.GlobalTracer().Start(ctx, "my/package.Function")
defer span.End()
for i := 0; i < 10; i++ {
if i%2 == 0 {
fmt.Printf("Even!\n")
}
}
}
ctx := context.Background()
printEvens(ctx)
}