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handler.js
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handler.js
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const url = require("url");
const {
Worker
} = require("worker_threads");
const logger = require("./system/logger.js");
const MAPPINGS = new Map();
async function spawn(url2, settings) {
if (MAPPINGS.has(url2)) {
logger.verbose("Terminating exisitng bridge!", url2);
await MAPPINGS.get(url2).terminate();
}
let worker = new Worker("./bridge.js", {
workerData: {
upstream: String(url2),
settings,
options: {}
},
env: process.env
});
worker.on("error", (err) => {
logger.error("Worker error", err);
MAPPINGS.delete(url2);
});
worker.on("exit", (code) => {
logger.debug(`Bridge ${url2} <-> ${settings.socket}://${settings.host}:${settings.port} finished`, code);
MAPPINGS.delete(url2);
});
logger.debug(`Bridge ${url2} <-> ${settings.socket}://${settings.host}:${settings.port}`);
MAPPINGS.set(url2, worker);
return Promise.resolve();
}
module.exports = (map, ws) => {
if (map.size === 0) {
logger.debug("No enabled devices returned, nothing to bridge...");
logger.verbose("Waiting for some enabled devices to bridge traffic.");
}
/* eslint-disable no-unused-vars */
let pendingPromises = Array.from(MAPPINGS).map(([url, worker]) => {
logger.verbose("Terminate worker", worker.threadId);
return worker.terminate();
});
Promise.all(pendingPromises).then(() => {
ws.on("message", (msg) => {
// parse data
msg = JSON.parse(msg);
logger.verbose("WebSocket message received", msg);
// handle only device specifiy events.
// Like added & updated devices rsp. interfaces
if (msg.component === "devices") {
let device = null;
if (msg.event === "add") {
device = msg.args[0];
logger.debug("Device in backend added", device);
} else if (msg.event === "update") {
device = msg.args[0];
logger.debug("Device in backend updated", device);
}
//console.log("Handle updated/added devices", msg);
if (["add", "update", "remove"].includes(msg.event)) {
device.interfaces.forEach((iface) => {
// parse websocket urls
let url1 = new url.URL(ws.url);
let url2 = new url.URL(`${process.env.BACKEND_URL}/api/devices/${device._id}/interfaces/${iface._id}`);
// set ws endpoint protocol
url2.protocol = url1.protocol;
if (msg.event === "add") {
// bridge added device
spawn(url2.toString(), iface.settings);
} else if (msg.event === "update") {
logger.debug(`iface ${iface._id} updated, wait 1.5s`);
// get worker instance from mapping
// send "shutdown" message to it
// listen for the exit event with code 0
// respawn worker
let worker = MAPPINGS.get(url2.toString());
if (!worker) {
return;
}
worker.once("exit", (code) => {
if (code === 0) {
setTimeout(() => {
// bridge updated device again
spawn(url2.toString(), iface.settings);
}, 1500);
}
});
// tell the worker to disconnect from ws endpoint
worker.postMessage("disconnect");
} else if (msg.event === "remove") {
// terminate bridiging for removed device
// TODO: Gracefullt shutodwn like in updated
//MAPPINGS.get(url2.toString()).terminate();
let worker = MAPPINGS.get(url2.toString());
worker.postMessage("disconnect");
setTimeout(() => {
worker.terminate();
}, 5000);
}
});
}
}
});
for (let [uri, { settings }] of map) {
// parse websocket urls
let url1 = new url.URL(ws.url);
let url2 = new url.URL(uri);
// override http(s) with ws(s)
url2.protocol = url1.protocol;
//console.log(`Bridge ${url2} <-> ${settings.socket}://${settings.host}:${settings.port}`);
spawn(url2.toString(), settings);
}
}).catch((err) => {
logger.error("Could not terminate all worker", err);
process.exit(1);
});
};