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Filter stream updates by Share ID

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This commit is contained in:
G.Ambatte
2026-10-11 01:14:52 +13:00
parent a51231535c
commit 444227e44d
1 changed files with 27 additions and 15 deletions
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server/eventStreamSource.js
+27 -15
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@@ -2,29 +2,37 @@ import { EventEmitter } from 'events';
import _ from 'lodash';
import { nanoid } from 'nanoid';
const UNSUB_DELAY = 60000; //ms
// DEBUG
const DEBUG = {
showEvents : true,
showSubscriberCount : true
};
// Delays
const UNSUB_DELAY = 60 * 1000; //ms
const REPORT_DELAY = 5 * 1000; //ms
const Stream = new EventEmitter;
// Create array of stream subscribers
let subscribers = [];
const debounceUnsub = _.debounce((id)=>{ unsubscribe(id); }, UNSUB_DELAY, { leading: false, trailing: true });
// Listener functions
const subscribe = function(shareId, res){
const id = nanoid(24); // NanoID is assumed globally unique;
const subscriber = {
id : nanoid(), // NanoID is assumed globally unique
id,
shareId,
stream : res,
time : new Date
stream : res,
time : new Date,
unsubTimer : setTimeout(()=>{ unsubscribe(id); }, UNSUB_DELAY)
};
subscribers.push(subscriber);
Stream.emit('sendUpdate', 'subscribe', { id: subscriber.id, shareId: subscriber.shareId, time: subscriber.time });
debounceUnsub(subscriber.id);
return subscriber.id;
};
@@ -40,22 +48,26 @@ const unsubscribe = function(id){
// Create global sendUpdate listener
Stream.on('sendUpdate', (event, data)=>{
console.log('Event:', event, '\nData:', data);
if(DEBUG.showEvents) console.log('Event:', event, '\nData:', data);
subscribers
.filter((sub)=>{return data.shareId == sub.shareId; })
.forEach((sub)=>{
sub?.stream?.write(`event: ${event}\ndata: ${JSON.stringify(data)}\n\n`);
if(event == 'brewUpdated'){
// Reset the unsubscription timer
clearTimeout(sub.unsubTimer);
sub.unsubTimer = setTimeout(()=>{ unsubscribe(sub.id); }, UNSUB_DELAY);
}
// invoke debounced unsub to delay execution
debounceUnsub(sub.id);
sub?.stream?.write(`event: ${event}\ndata: ${JSON.stringify(data)}\n\n`);
});
});
// DEBUG: Report subscriber count periodically
const REPORT_DELAY = 1000; //ms
const reportIntervalId = setInterval(()=>{
console.log('Subscriber count:', subscribers.length);
}, REPORT_DELAY);
if(DEBUG.showSubscriberCount){
const reportIntervalId = setInterval(()=>{
console.log('Subscriber count:', subscribers.length, ' @ ', new Date);
}, REPORT_DELAY);
}
export default {
emit : function(event) {return Stream.emit(event, ...([...arguments].slice(1)));}, // Arguments doesn't work for arrow functions