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Filter stream updates by Share ID

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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 _ from 'lodash';
import { nanoid } from 'nanoid'; 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; const Stream = new EventEmitter;
// Create array of stream subscribers // Create array of stream subscribers
let subscribers = []; let subscribers = [];
const debounceUnsub = _.debounce((id)=>{ unsubscribe(id); }, UNSUB_DELAY, { leading: false, trailing: true });
// Listener functions // Listener functions
const subscribe = function(shareId, res){ const subscribe = function(shareId, res){
const id = nanoid(24); // NanoID is assumed globally unique;
const subscriber = { const subscriber = {
id : nanoid(), // NanoID is assumed globally unique id,
shareId, shareId,
stream : res, stream : res,
time : new Date time : new Date,
unsubTimer : setTimeout(()=>{ unsubscribe(id); }, UNSUB_DELAY)
}; };
subscribers.push(subscriber); subscribers.push(subscriber);
Stream.emit('sendUpdate', 'subscribe', { id: subscriber.id, shareId: subscriber.shareId, time: subscriber.time }); Stream.emit('sendUpdate', 'subscribe', { id: subscriber.id, shareId: subscriber.shareId, time: subscriber.time });
debounceUnsub(subscriber.id);
return subscriber.id; return subscriber.id;
}; };
@@ -40,22 +48,26 @@ const unsubscribe = function(id){
// Create global sendUpdate listener // Create global sendUpdate listener
Stream.on('sendUpdate', (event, data)=>{ Stream.on('sendUpdate', (event, data)=>{
console.log('Event:', event, '\nData:', data); if(DEBUG.showEvents) console.log('Event:', event, '\nData:', data);
subscribers subscribers
.filter((sub)=>{return data.shareId == sub.shareId; }) .filter((sub)=>{return data.shareId == sub.shareId; })
.forEach((sub)=>{ .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 sub?.stream?.write(`event: ${event}\ndata: ${JSON.stringify(data)}\n\n`);
debounceUnsub(sub.id);
}); });
}); });
// DEBUG: Report subscriber count periodically // DEBUG: Report subscriber count periodically
const REPORT_DELAY = 1000; //ms if(DEBUG.showSubscriberCount){
const reportIntervalId = setInterval(()=>{ const reportIntervalId = setInterval(()=>{
console.log('Subscriber count:', subscribers.length); console.log('Subscriber count:', subscribers.length, ' @ ', new Date);
}, REPORT_DELAY); }, REPORT_DELAY);
}
export default { export default {
emit : function(event) {return Stream.emit(event, ...([...arguments].slice(1)));}, // Arguments doesn't work for arrow functions emit : function(event) {return Stream.emit(event, ...([...arguments].slice(1)));}, // Arguments doesn't work for arrow functions