ac97ea573c
* Update go-redis to v8.4.0 * github.com/go-redis/redis/v8 v8.4.0 -> v8.5.0 * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * TODO * Use the Queue termination channel as the default context for pushes Signed-off-by: Andrew Thornton <art27@cantab.net> * missed one Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: zeripath <art27@cantab.net>
78 lines
2.7 KiB
Go
Vendored
78 lines
2.7 KiB
Go
Vendored
// 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 propagation // import "go.opentelemetry.io/otel/propagation"
|
|
|
|
import "context"
|
|
|
|
// TextMapCarrier is the storage medium used by a TextMapPropagator.
|
|
type TextMapCarrier interface {
|
|
// Get returns the value associated with the passed key.
|
|
Get(key string) string
|
|
// Set stores the key-value pair.
|
|
Set(key string, value string)
|
|
}
|
|
|
|
// TextMapPropagator propagates cross-cutting concerns as key-value text
|
|
// pairs within a carrier that travels in-band across process boundaries.
|
|
type TextMapPropagator interface {
|
|
// Inject set cross-cutting concerns from the Context into the carrier.
|
|
Inject(ctx context.Context, carrier TextMapCarrier)
|
|
// Extract reads cross-cutting concerns from the carrier into a Context.
|
|
Extract(ctx context.Context, carrier TextMapCarrier) context.Context
|
|
// Fields returns the keys who's values are set with Inject.
|
|
Fields() []string
|
|
}
|
|
|
|
type compositeTextMapPropagator []TextMapPropagator
|
|
|
|
func (p compositeTextMapPropagator) Inject(ctx context.Context, carrier TextMapCarrier) {
|
|
for _, i := range p {
|
|
i.Inject(ctx, carrier)
|
|
}
|
|
}
|
|
|
|
func (p compositeTextMapPropagator) Extract(ctx context.Context, carrier TextMapCarrier) context.Context {
|
|
for _, i := range p {
|
|
ctx = i.Extract(ctx, carrier)
|
|
}
|
|
return ctx
|
|
}
|
|
|
|
func (p compositeTextMapPropagator) Fields() []string {
|
|
unique := make(map[string]struct{})
|
|
for _, i := range p {
|
|
for _, k := range i.Fields() {
|
|
unique[k] = struct{}{}
|
|
}
|
|
}
|
|
|
|
fields := make([]string, 0, len(unique))
|
|
for k := range unique {
|
|
fields = append(fields, k)
|
|
}
|
|
return fields
|
|
}
|
|
|
|
// NewCompositeTextMapPropagator returns a unified TextMapPropagator from the
|
|
// group of passed TextMapPropagator. This allows different cross-cutting
|
|
// concerns to be propagates in a unified manner.
|
|
//
|
|
// The returned TextMapPropagator will inject and extract cross-cutting
|
|
// concerns in the order the TextMapPropagators were provided. Additionally,
|
|
// the Fields method will return a de-duplicated slice of the keys that are
|
|
// set with the Inject method.
|
|
func NewCompositeTextMapPropagator(p ...TextMapPropagator) TextMapPropagator {
|
|
return compositeTextMapPropagator(p)
|
|
}
|