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72 lines
1.5 KiB
72 lines
1.5 KiB
package dispatcher
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import (
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"log"
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"math"
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"math/rand"
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"sync"
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"time"
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)
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// Dispatcher -
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type Dispatcher struct {
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subscribers map[int]dispatchSubscriber
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subscribersMux *sync.Mutex
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}
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type dispatchSubscriber struct {
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notifyCancelOrCloseChan chan error
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closeCh <-chan struct{}
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}
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// NewDispatcher -
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func NewDispatcher() *Dispatcher {
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return &Dispatcher{
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subscribers: make(map[int]dispatchSubscriber),
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subscribersMux: &sync.Mutex{},
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}
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}
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// Dispatch -
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func (d *Dispatcher) Dispatch(err error) error {
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d.subscribersMux.Lock()
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defer d.subscribersMux.Unlock()
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for _, subscriber := range d.subscribers {
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select {
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case <-time.After(time.Second * 5):
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log.Println("Unexpected rabbitmq error: timeout in dispatch")
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case subscriber.notifyCancelOrCloseChan <- err:
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}
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}
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return nil
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}
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// AddSubscriber -
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func (d *Dispatcher) AddSubscriber() (<-chan error, chan<- struct{}) {
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const maxRand = math.MaxInt64
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const minRand = 0
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id := rand.Intn(maxRand-minRand) + minRand
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closeCh := make(chan struct{})
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notifyCancelOrCloseChan := make(chan error)
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d.subscribersMux.Lock()
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d.subscribers[id] = dispatchSubscriber{
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notifyCancelOrCloseChan: notifyCancelOrCloseChan,
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closeCh: closeCh,
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}
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d.subscribersMux.Unlock()
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go func(id int) {
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<-closeCh
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d.subscribersMux.Lock()
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defer d.subscribersMux.Unlock()
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sub, ok := d.subscribers[id]
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if !ok {
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return
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}
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close(sub.notifyCancelOrCloseChan)
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delete(d.subscribers, id)
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}(id)
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return notifyCancelOrCloseChan, closeCh
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}
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