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// Copyright 2022 The OpenZipkin 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 baggage holds a Baggage propagation implementation based on
// explicit allowList semantics.
package baggage
import (
"strings"
"github.com/openzipkin/zipkin-go/middleware"
"github.com/openzipkin/zipkin-go/model"
)
var (
_ middleware.BaggageHandler = (*baggage)(nil)
_ model.BaggageFields = (*baggage)(nil)
)
type baggage struct {
// registry holds our registry of allowed fields to propagate
registry map[string]struct{}
// fields holds the retrieved key-values pairs to propagate
fields map[string][]string
}
// New returns a new Baggage interface which is configured to propagate the
// registered fields.
func New(keys ...string) middleware.BaggageHandler {
b := &baggage{
registry: make(map[string]struct{}),
}
for _, key := range keys {
b.registry[strings.ToLower(key)] = struct{}{}
}
return b
}
// New is called by server middlewares and returns a fresh initialized
// baggage implementation.
func (b *baggage) New() model.BaggageFields {
return &baggage{
registry: b.registry,
fields: make(map[string][]string),
}
}
func (b *baggage) Get(key string) []string {
return b.fields[strings.ToLower(key)]
}
func (b *baggage) Add(key string, values ...string) bool {
if len(values) == 0 {
return false
}
key = strings.ToLower(key)
if _, ok := b.registry[key]; !ok {
return false
}
// multiple values for a header is allowed
b.fields[key] = append(b.fields[key], values...)
return true
}
func (b *baggage) Set(key string, values ...string) bool {
if len(values) == 0 {
return false
}
key = strings.ToLower(key)
if _, ok := b.registry[key]; !ok {
return false
}
b.fields[key] = values
return true
}
func (b *baggage) Delete(key string) bool {
key = strings.ToLower(key)
if _, ok := b.registry[key]; !ok {
return false
}
for k := range b.fields {
if key == k {
delete(b.fields, k)
}
}
return true
}
func (b *baggage) Iterate(f func(key string, values []string)) {
for key, v := range b.fields {
values := make([]string, len(v))
copy(values, v)
f(key, values)
}
}
func (b *baggage) IterateKeys(f func(key string)) {
for key := range b.registry {
f(key)
}
}
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