mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-23 06:40:23 +00:00
71 lines
2.1 KiB
Go
71 lines
2.1 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 trace provides an implementation of the tracing part of the
|
||
|
|
OpenTelemetry API.
|
||
|
|
|
||
|
|
This package is currently in a pre-GA phase. Backwards incompatible changes
|
||
|
|
may be introduced in subsequent minor version releases as we work to track the
|
||
|
|
evolving OpenTelemetry specification and user feedback.
|
||
|
|
|
||
|
|
To participate in distributed traces a Span needs to be created for the
|
||
|
|
operation being performed as part of a traced workflow. It its simplest form:
|
||
|
|
|
||
|
|
var tracer trace.Tracer
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
tracer = otel.Tracer("instrumentation/package/name")
|
||
|
|
}
|
||
|
|
|
||
|
|
func operation(ctx context.Context) {
|
||
|
|
var span trace.Span
|
||
|
|
ctx, span = tracer.Start(ctx, "operation")
|
||
|
|
defer span.End()
|
||
|
|
// ...
|
||
|
|
}
|
||
|
|
|
||
|
|
A Tracer is unique to the instrumentation and is used to create Spans.
|
||
|
|
Instrumentation should be designed to accept a TracerProvider from which it
|
||
|
|
can create its own unique Tracer. Alternatively, the registered global
|
||
|
|
TracerProvider from the go.opentelemetry.io/otel package can be used as
|
||
|
|
a default.
|
||
|
|
|
||
|
|
const (
|
||
|
|
name = "instrumentation/package/name"
|
||
|
|
version = "0.1.0"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Instrumentation struct {
|
||
|
|
tracer trace.Tracer
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewInstrumentation(tp trace.TracerProvider) *Instrumentation {
|
||
|
|
if tp == nil {
|
||
|
|
tp = otel.TracerProvider()
|
||
|
|
}
|
||
|
|
return &Instrumentation{
|
||
|
|
tracer: tp.Tracer(name, trace.WithInstrumentationVersion(version)),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func operation(ctx context.Context, inst *Instrumentation) {
|
||
|
|
var span trace.Span
|
||
|
|
ctx, span = inst.tracer.Start(ctx, "operation")
|
||
|
|
defer span.End()
|
||
|
|
// ...
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
package trace // import "go.opentelemetry.io/otel/trace"
|