woodpecker/server/pubsub/pub.go
2023-10-13 07:34:33 +02:00

66 lines
1.5 KiB
Go

// Copyright 2023 Woodpecker 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 pubsub
import (
"context"
"sync"
)
// Message defines a published message.
type Message struct {
// ID identifies this message.
ID string `json:"id,omitempty"`
// Data is the actual data in the entry.
Data []byte `json:"data"`
// Labels represents the key-value pairs the entry is labeled with.
Labels map[string]string `json:"labels,omitempty"`
}
// Receiver receives published messages.
type Receiver func(Message)
type Publisher struct {
sync.Mutex
subs map[*Receiver]struct{}
}
// New creates an in-memory publisher.
func New() *Publisher {
return &Publisher{
subs: make(map[*Receiver]struct{}),
}
}
func (p *Publisher) Publish(message Message) {
p.Lock()
for s := range p.subs {
go (*s)(message)
}
p.Unlock()
}
func (p *Publisher) Subscribe(c context.Context, receiver Receiver) {
p.Lock()
p.subs[&receiver] = struct{}{}
p.Unlock()
<-c.Done()
p.Lock()
delete(p.subs, &receiver)
p.Unlock()
}