mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
15bfc5bb12
Also fixes example module paths so that they use the vanity URL instead of the github URL. [Closes #184]
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// 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 distributedcontext
|
|
|
|
import (
|
|
"context"
|
|
"runtime/pprof"
|
|
|
|
"go.opentelemetry.io/otel/api/core"
|
|
)
|
|
|
|
type ctxEntriesType struct{}
|
|
|
|
var (
|
|
ctxEntriesKey = &ctxEntriesType{}
|
|
)
|
|
|
|
func WithMap(ctx context.Context, m Map) context.Context {
|
|
return context.WithValue(ctx, ctxEntriesKey, m)
|
|
}
|
|
|
|
func NewContext(ctx context.Context, keyvalues ...core.KeyValue) context.Context {
|
|
return WithMap(ctx, FromContext(ctx).Apply(MapUpdate{
|
|
MultiKV: keyvalues,
|
|
}))
|
|
}
|
|
|
|
func FromContext(ctx context.Context) Map {
|
|
if m, ok := ctx.Value(ctxEntriesKey).(Map); ok {
|
|
return m
|
|
}
|
|
return NewEmptyMap()
|
|
}
|
|
|
|
// Note: the golang pprof.Do API forces this memory allocation, we
|
|
// should file an issue about that. (There's a TODO in the source.)
|
|
func Do(ctx context.Context, f func(ctx context.Context)) {
|
|
m := FromContext(ctx)
|
|
keyvals := make([]string, 0, 2*len(m.m))
|
|
for k, v := range m.m {
|
|
keyvals = append(keyvals, string(k), v.value.Emit())
|
|
}
|
|
pprof.Do(ctx, pprof.Labels(keyvals...), f)
|
|
}
|