73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
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// The Message Notification system is a method to notify various protocols
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// running on a node when a new message was received.
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//
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// Protocols can subscribe to messages of specific topics, then when one is received
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// The notification handler function will be called.
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package protocol
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import (
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"sync"
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)
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type MessageNotificationHandler func(topic string, msg *WakuMessage)
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type MessageNotificationSubscriptionIdentifier string
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type MessageNotificationSubscription struct {
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topics []string // @TODO TOPIC (?)
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handler MessageNotificationHandler
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}
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type MessageNotificationSubscriptions map[string]MessageNotificationSubscription
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func (subscriptions MessageNotificationSubscriptions) subscribe(name string, subscription MessageNotificationSubscription) {
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subscriptions[name] = subscription
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}
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func Init(topics []string, handler MessageNotificationHandler) MessageNotificationSubscription {
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result := MessageNotificationSubscription{}
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result.topics = topics
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result.handler = handler
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return result
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}
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func containsMatch(lhs []string, rhs []string) bool {
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for _, l := range lhs {
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for _, r := range rhs {
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if l == r {
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return true
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}
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}
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}
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return false
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}
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func (subscriptions MessageNotificationSubscriptions) notify(topic string, msg *WakuMessage) {
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var wg sync.WaitGroup
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for _, subscription := range subscriptions {
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// @TODO WILL NEED TO CHECK SUBTOPICS IN FUTURE FOR WAKU TOPICS NOT LIBP2P ONES
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found := false
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for _, subscriptionTopic := range subscription.topics {
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if subscriptionTopic == topic {
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found = true
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break
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}
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}
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if !found {
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continue
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}
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wg.Add(1)
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go func(subs MessageNotificationSubscription) {
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subs.handler(topic, msg)
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wg.Done()
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}(subscription)
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}
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wg.Wait()
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}
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