grind-assets/lib/Devtools/Server/socket.js

Asset management for Grind

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.socket = socket;

var _grindFramework = require("grind-framework");

let ws = null;

try {
  ws = require('ws');
} catch (err) {
  throw new _grindFramework.MissingPackageError('ws', 'dev');
}

function socket(app) {
  app.assets.websocket = app.routes.upgrade('@assets/socket');
  app.assets.websocket.replayLog = [];
  app.assets.websocket.sendAll = sendAll.bind(null, app.assets.websocket);
  app.assets.websocket.on('connection', client => {
    client.on('message', handleMessage.bind(null, app.assets.websocket, client));
  });
}

function sendAll(wss, data, shouldReplayAfterConnect) {
  if (shouldReplayAfterConnect) {
    const cutoff = Date.now() - 5000;
    wss.replayLog = wss.replayLog.filter(({
      ts
    }) => ts > cutoff);
    wss.replayLog.push({
      ts: Date.now(),
      data
    });
  }

  data = JSON.stringify(data);

  for (const client of wss.clients) {
    if (client.readyState !== ws.OPEN) {
      continue;
    }

    client.send(data);
  }
}

function handleMessage(wss, client, message) {
  message = JSON.parse(message);

  if (message.type !== 'init') {
    return;
  }

  for (const replay of wss.replayLog) {
    if (replay.ts < message.since) {
      continue;
    }

    client.send(JSON.stringify(replay.data));
  }
}
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