mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-21 12:03:26 +02:00
112 lines
3.4 KiB
Go
112 lines
3.4 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 propagation // import "go.opentelemetry.io/otel/propagation"
|
||
|
|
||
|
import (
|
||
|
"context"
|
||
|
"net/url"
|
||
|
"strings"
|
||
|
|
||
|
"go.opentelemetry.io/otel/internal/baggage"
|
||
|
"go.opentelemetry.io/otel/label"
|
||
|
)
|
||
|
|
||
|
const baggageHeader = "baggage"
|
||
|
|
||
|
// Baggage is a propagator that supports the W3C Baggage format.
|
||
|
//
|
||
|
// This propagates user-defined baggage associated with a trace. The complete
|
||
|
// specification is defined at https://w3c.github.io/baggage/.
|
||
|
type Baggage struct{}
|
||
|
|
||
|
var _ TextMapPropagator = Baggage{}
|
||
|
|
||
|
// Inject sets baggage key-values from ctx into the carrier.
|
||
|
func (b Baggage) Inject(ctx context.Context, carrier TextMapCarrier) {
|
||
|
baggageMap := baggage.MapFromContext(ctx)
|
||
|
firstIter := true
|
||
|
var headerValueBuilder strings.Builder
|
||
|
baggageMap.Foreach(func(kv label.KeyValue) bool {
|
||
|
if !firstIter {
|
||
|
headerValueBuilder.WriteRune(',')
|
||
|
}
|
||
|
firstIter = false
|
||
|
headerValueBuilder.WriteString(url.QueryEscape(strings.TrimSpace((string)(kv.Key))))
|
||
|
headerValueBuilder.WriteRune('=')
|
||
|
headerValueBuilder.WriteString(url.QueryEscape(strings.TrimSpace(kv.Value.Emit())))
|
||
|
return true
|
||
|
})
|
||
|
if headerValueBuilder.Len() > 0 {
|
||
|
headerString := headerValueBuilder.String()
|
||
|
carrier.Set(baggageHeader, headerString)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Extract returns a copy of parent with the baggage from the carrier added.
|
||
|
func (b Baggage) Extract(parent context.Context, carrier TextMapCarrier) context.Context {
|
||
|
bVal := carrier.Get(baggageHeader)
|
||
|
if bVal == "" {
|
||
|
return parent
|
||
|
}
|
||
|
|
||
|
baggageValues := strings.Split(bVal, ",")
|
||
|
keyValues := make([]label.KeyValue, 0, len(baggageValues))
|
||
|
for _, baggageValue := range baggageValues {
|
||
|
valueAndProps := strings.Split(baggageValue, ";")
|
||
|
if len(valueAndProps) < 1 {
|
||
|
continue
|
||
|
}
|
||
|
nameValue := strings.Split(valueAndProps[0], "=")
|
||
|
if len(nameValue) < 2 {
|
||
|
continue
|
||
|
}
|
||
|
name, err := url.QueryUnescape(nameValue[0])
|
||
|
if err != nil {
|
||
|
continue
|
||
|
}
|
||
|
trimmedName := strings.TrimSpace(name)
|
||
|
value, err := url.QueryUnescape(nameValue[1])
|
||
|
if err != nil {
|
||
|
continue
|
||
|
}
|
||
|
trimmedValue := strings.TrimSpace(value)
|
||
|
|
||
|
// TODO (skaris): properties defiend https://w3c.github.io/correlation-context/, are currently
|
||
|
// just put as part of the value.
|
||
|
var trimmedValueWithProps strings.Builder
|
||
|
trimmedValueWithProps.WriteString(trimmedValue)
|
||
|
for _, prop := range valueAndProps[1:] {
|
||
|
trimmedValueWithProps.WriteRune(';')
|
||
|
trimmedValueWithProps.WriteString(prop)
|
||
|
}
|
||
|
|
||
|
keyValues = append(keyValues, label.String(trimmedName, trimmedValueWithProps.String()))
|
||
|
}
|
||
|
|
||
|
if len(keyValues) > 0 {
|
||
|
// Only update the context if valid values were found
|
||
|
return baggage.ContextWithMap(parent, baggage.NewMap(baggage.MapUpdate{
|
||
|
MultiKV: keyValues,
|
||
|
}))
|
||
|
}
|
||
|
|
||
|
return parent
|
||
|
}
|
||
|
|
||
|
// Fields returns the keys who's values are set with Inject.
|
||
|
func (b Baggage) Fields() []string {
|
||
|
return []string{baggageHeader}
|
||
|
}
|