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https://github.com/woodpecker-ci/woodpecker.git
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67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
// Copyright 2023 Woodpecker Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pubsub
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import (
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"context"
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"sync"
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)
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// Message defines a published message.
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type Message struct {
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// ID identifies this message.
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ID string `json:"id,omitempty"`
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// Data is the actual data in the entry.
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Data []byte `json:"data"`
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// Labels represents the key-value pairs the entry is labeled with.
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Labels map[string]string `json:"labels,omitempty"`
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}
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// Receiver receives published messages.
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type Receiver func(Message)
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type Publisher struct {
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sync.Mutex
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subs map[*Receiver]struct{}
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}
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// New creates an in-memory publisher.
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func New() *Publisher {
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return &Publisher{
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subs: make(map[*Receiver]struct{}),
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}
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}
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func (p *Publisher) Publish(message Message) {
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p.Lock()
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for s := range p.subs {
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go (*s)(message)
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}
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p.Unlock()
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}
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func (p *Publisher) Subscribe(c context.Context, receiver Receiver) {
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p.Lock()
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p.subs[&receiver] = struct{}{}
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p.Unlock()
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<-c.Done()
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p.Lock()
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delete(p.subs, &receiver)
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p.Unlock()
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}
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