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Merge pull request #602 from onflow/janez/generic-publisher-subscriber
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,76 +1,74 @@ | ||
| package models | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "sync" | ||
|
|
||
| "github.com/google/uuid" | ||
| ) | ||
|
|
||
| type Publisher struct { | ||
| type Publisher[T any] struct { | ||
| mux sync.RWMutex | ||
| subscribers map[uuid.UUID]Subscriber | ||
| subscribers map[Subscriber[T]]struct{} | ||
| } | ||
|
|
||
| func NewPublisher() *Publisher { | ||
| return &Publisher{ | ||
| func NewPublisher[T any]() *Publisher[T] { | ||
| return &Publisher[T]{ | ||
| mux: sync.RWMutex{}, | ||
| subscribers: make(map[uuid.UUID]Subscriber), | ||
| subscribers: make(map[Subscriber[T]]struct{}), | ||
| } | ||
| } | ||
|
|
||
| func (p *Publisher) Publish(data any) { | ||
| func (p *Publisher[T]) Publish(data T) { | ||
| p.mux.RLock() | ||
| defer p.mux.RUnlock() | ||
|
|
||
| for _, s := range p.subscribers { | ||
| for s := range p.subscribers { | ||
| s.Notify(data) | ||
| } | ||
| } | ||
|
|
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| func (p *Publisher) Subscribe(s Subscriber) { | ||
| func (p *Publisher[T]) Subscribe(s Subscriber[T]) { | ||
| p.mux.Lock() | ||
| defer p.mux.Unlock() | ||
|
|
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| p.subscribers[s.ID()] = s | ||
| p.subscribers[s] = struct{}{} | ||
| } | ||
|
|
||
| func (p *Publisher) Unsubscribe(s Subscriber) { | ||
| func (p *Publisher[T]) Unsubscribe(s Subscriber[T]) { | ||
| p.mux.Lock() | ||
| defer p.mux.Unlock() | ||
|
|
||
| delete(p.subscribers, s.ID()) | ||
| delete(p.subscribers, s) | ||
| } | ||
|
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| type Subscriber interface { | ||
| ID() uuid.UUID | ||
| Notify(data any) | ||
| type Subscriber[T any] interface { | ||
| Notify(data T) | ||
| Error() <-chan error | ||
| } | ||
|
|
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| type Subscription struct { | ||
| type Subscription[T any] struct { | ||
| err chan error | ||
| callback func(data any) error | ||
| uuid uuid.UUID | ||
| callback func(data T) error | ||
| } | ||
|
|
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| func NewSubscription(callback func(any) error) *Subscription { | ||
| return &Subscription{ | ||
| func NewSubscription[T any](callback func(T) error) *Subscription[T] { | ||
| return &Subscription[T]{ | ||
| callback: callback, | ||
| uuid: uuid.New(), | ||
| err: make(chan error), | ||
| } | ||
| } | ||
|
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| func (b *Subscription) Notify(data any) { | ||
| func (b *Subscription[T]) Notify(data T) { | ||
| err := b.callback(data) | ||
| if err != nil { | ||
| b.err <- err | ||
| select { | ||
| case b.err <- err: | ||
| default: | ||
| // TODO: handle this better! | ||
| panic(fmt.Sprintf("failed to send error to subscription %v", err)) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (b *Subscription) ID() uuid.UUID { | ||
| return b.uuid | ||
| } | ||
|
|
||
| func (b *Subscription) Error() <-chan error { | ||
| func (b *Subscription[T]) Error() <-chan error { | ||
| return b.err | ||
| } |
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