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TCP echo Server
Concepts
- Listening for TCP port connections with Deno.listen.
- Use Deno.Conn.readable and Deno.Conn.writable to take inbound data and redirect it to be outbound data.
Example
This is an example of a server which accepts connections on port 8080, and returns to the client anything it sends.
/**
* echo_server.ts
*/
const listener = Deno.listen({ port: 8080 });
console.log("listening on 0.0.0.0:8080");
for await (const conn of listener) {
conn.readable.pipeTo(conn.writable);
}Run with:
deno run --allow-net echo_server.tsTo test it, try sending data to it with
netcat (Linux/MacOS only). Below
'hello world' is sent over the connection, which is then echoed back to the
user:
$ nc localhost 8080
hello world
hello worldLike the cat.ts example, the pipeTo() method here also does
not make unnecessary memory copies. It receives a packet from the kernel and
sends back, without further complexity.