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sseServer.ts
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sseServer.ts
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/*
* This is an example of a server that utilizes the router.
*/
// Importing some console colors
import {
bold,
cyan,
green,
yellow,
} from "https://deno.land/std@0.77.0/fmt/colors.ts";
import {
Application,
Context,
isHttpError,
Router,
ServerSentEvent,
Status,
} from "../mod.ts";
interface Book {
id: string;
title: string;
author: string;
}
function notFound(ctx: Context) {
ctx.response.status = Status.NotFound;
ctx.response.body =
`<html><body><h1>404 - Not Found</h1><p>Path <code>${ctx.request.url}</code> not found.`;
}
const router = new Router();
router
.get("/", async (ctx) => {
await ctx.send(
{
root: `${Deno.cwd()}/examples/resources`,
path: "sseServer_index.html",
},
);
})
// for any clients that request the `/sse` endpoint, we will send a message
// every 2 seconds.
.get("/sse", (ctx: Context) => {
ctx.assert(
ctx.request.accepts("text/event-stream"),
Status.UnsupportedMediaType,
);
const connection = `${
(ctx.request.serverRequest.conn.remoteAddr as Deno.NetAddr).hostname
}:${(ctx.request.serverRequest.conn.remoteAddr as Deno.NetAddr).port}`;
const target = ctx.sendEvents();
console.log(`${green("SSE connect")} ${cyan(connection)}`);
let counter = 0;
const id = setInterval(() => {
const evt = new ServerSentEvent(
"message",
{ hello: "world" },
{ id: counter++ },
);
target.dispatchEvent(evt);
}, 2000);
target.addEventListener("close", () => {
console.log(`${green("SSE disconnect")} ${cyan(connection)}`);
clearInterval(id);
});
});
const app = new Application();
// Logger
app.use(async (context, next) => {
await next();
const rt = context.response.headers.get("X-Response-Time");
console.log(
`${green(context.request.method)} ${cyan(context.request.url.pathname)} - ${
bold(
String(rt),
)
}`,
);
});
// Response Time
app.use(async (context, next) => {
const start = Date.now();
await next();
const ms = Date.now() - start;
context.response.headers.set("X-Response-Time", `${ms}ms`);
});
// Error handler
app.use(async (context, next) => {
try {
await next();
} catch (err) {
if (isHttpError(err)) {
context.response.status = err.status;
const { message, status, stack } = err;
if (context.request.accepts("json")) {
context.response.body = { message, status, stack };
context.response.type = "json";
} else {
context.response.body = `${status} ${message}\n\n${stack ?? ""}`;
context.response.type = "text/plain";
}
} else {
console.log(err);
throw err;
}
}
});
// Use the router
app.use(router.routes());
app.use(router.allowedMethods());
// A basic 404 page
app.use(notFound);
app.addEventListener("listen", ({ hostname, port }) => {
console.log(
bold("Start listening on ") + yellow(`${hostname}:${port}`),
);
});
await app.listen({ hostname: "127.0.0.1", port: 8000 });
console.log(bold("Finished."));