75 lines
1.1 KiB
Go
75 lines
1.1 KiB
Go
package pubsub
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
)
|
|
|
|
type subscriber struct {
|
|
receiver Receiver
|
|
}
|
|
|
|
type publisher struct {
|
|
sync.Mutex
|
|
|
|
topics map[string]*topic
|
|
}
|
|
|
|
// New creates an in-memory publisher.
|
|
func New() Publisher {
|
|
return &publisher{
|
|
topics: make(map[string]*topic),
|
|
}
|
|
}
|
|
|
|
func (p *publisher) Create(c context.Context, dest string) error {
|
|
p.Lock()
|
|
t, ok := p.topics[dest]
|
|
if !ok {
|
|
t = newTopic(dest)
|
|
p.topics[dest] = t
|
|
}
|
|
p.Unlock()
|
|
return nil
|
|
}
|
|
|
|
func (p *publisher) Publish(c context.Context, dest string, message Message) error {
|
|
p.Lock()
|
|
t, ok := p.topics[dest]
|
|
p.Unlock()
|
|
if !ok {
|
|
return ErrNotFound
|
|
}
|
|
t.publish(message)
|
|
return nil
|
|
}
|
|
|
|
func (p *publisher) Subscribe(c context.Context, dest string, receiver Receiver) error {
|
|
p.Lock()
|
|
t, ok := p.topics[dest]
|
|
p.Unlock()
|
|
if !ok {
|
|
return ErrNotFound
|
|
}
|
|
s := &subscriber{
|
|
receiver: receiver,
|
|
}
|
|
t.subscribe(s)
|
|
select {
|
|
case <-c.Done():
|
|
case <-t.done:
|
|
}
|
|
t.unsubscribe(s)
|
|
return nil
|
|
}
|
|
|
|
func (p *publisher) Remove(c context.Context, dest string) error {
|
|
p.Lock()
|
|
t, ok := p.topics[dest]
|
|
if ok {
|
|
delete(p.topics, dest)
|
|
t.close()
|
|
}
|
|
p.Unlock()
|
|
return nil
|
|
}
|