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livereload_server.ts
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livereload_server.ts
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import { serve } from "https://deno.land/std@0.96.0/http/server.ts";
import {
acceptWebSocket,
isWebSocketCloseEvent,
isWebSocketPingEvent,
WebSocket,
} from "https://deno.land/std@0.96.0/ws/mod.ts";
import { logger } from "./logger_util.ts";
async function handleWs(sock: WebSocket, eventtarget: EventTarget) {
logger.debug("socket connected!");
eventtarget.addEventListener("built", async () => {
logger.debug("got reload event!");
if (!sock.isClosed) {
await sock.send(JSON.stringify({ type: "reload" }));
sock.close(1000).catch(logger.error);
}
}, { once: true });
try {
for await (const ev of sock) {
if (typeof ev === "string") {
// text message.
logger.debug("ws:Text", ev);
await sock.send(ev);
} else if (ev instanceof Uint8Array) {
// binary message.
logger.debug("ws:Binary", ev);
} else if (isWebSocketPingEvent(ev)) {
const [, body] = ev;
// ping.
logger.debug("ws:Ping", body);
} else if (isWebSocketCloseEvent(ev)) {
// close.
const { code, reason } = ev;
logger.debug("ws:Close", code, reason);
}
}
} catch (err) {
logger.error(`failed to receive frame: ${err}`);
if (!sock.isClosed) {
await sock.close(1000).catch(logger.error);
}
}
}
export async function livereloadServer(port = 35729, eventtarget: EventTarget) {
logger.debug(`livereload websocket server is running on port=${port}`);
for await (const req of serve(`:${port}`)) {
if (req.url === "/livereload.js") {
req.respond({
body: `
window.onload = () => {
new WebSocket("ws://localhost:${port}/livereload").onmessage = () => location.reload();
};
`,
});
continue;
}
const { conn, r: bufReader, w: bufWriter, headers } = req;
logger.debug(req);
acceptWebSocket({
conn,
bufReader,
bufWriter,
headers,
})
.then((ws) => handleWs(ws, eventtarget))
.catch(async (err) => {
logger.error(`failed to accept websocket: ${err}`);
await req.respond({ status: 400 });
});
}
}