feat: Add "deno_net" extension (#11150)

This commits moves implementation of net related APIs available on "Deno"
namespace to "deno_net" extension.

Following APIs were moved:
- Deno.listen()
- Deno.connect()
- Deno.listenTls()
- Deno.serveHttp()
- Deno.shutdown()
- Deno.resolveDns()
- Deno.listenDatagram()
- Deno.startTls()
- Deno.Conn
- Deno.Listener
- Deno.DatagramConn

1 files changed, 234 insertions, 0 deletions

diff --git a/extensions/net/01_net.js b/extensions/net/01_net.js
new file mode 100644
index 000000000..9a531bd94
--- /dev/null
+++ b/extensions/net/01_net.js
@@ -0,0 +1,234 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+"use strict";
+
+((window) => {
+  const core = window.Deno.core;
+  const { BadResource } = core;
+
+  async function read(
+    rid,
+    buffer,
+  ) {
+    if (buffer.length === 0) {
+      return 0;
+    }
+    const nread = await core.opAsync("op_net_read_async", rid, buffer);
+    return nread === 0 ? null : nread;
+  }
+
+  async function write(rid, data) {
+    return await core.opAsync("op_net_write_async", rid, data);
+  }
+
+  function shutdown(rid) {
+    return core.opAsync("op_net_shutdown", rid);
+  }
+
+  function opAccept(rid, transport) {
+    return core.opAsync("op_accept", { rid, transport });
+  }
+
+  function opListen(args) {
+    return core.opSync("op_listen", args);
+  }
+
+  function opConnect(args) {
+    return core.opAsync("op_connect", args);
+  }
+
+  function opReceive(rid, transport, zeroCopy) {
+    return core.opAsync(
+      "op_datagram_receive",
+      { rid, transport },
+      zeroCopy,
+    );
+  }
+
+  function opSend(args, zeroCopy) {
+    return core.opAsync("op_datagram_send", args, zeroCopy);
+  }
+
+  function resolveDns(query, recordType, options) {
+    return core.opAsync("op_dns_resolve", { query, recordType, options });
+  }
+
+  class Conn {
+    #rid = 0;
+    #remoteAddr = null;
+    #localAddr = null;
+    constructor(rid, remoteAddr, localAddr) {
+      this.#rid = rid;
+      this.#remoteAddr = remoteAddr;
+      this.#localAddr = localAddr;
+    }
+
+    get rid() {
+      return this.#rid;
+    }
+
+    get remoteAddr() {
+      return this.#remoteAddr;
+    }
+
+    get localAddr() {
+      return this.#localAddr;
+    }
+
+    write(p) {
+      return write(this.rid, p);
+    }
+
+    read(p) {
+      return read(this.rid, p);
+    }
+
+    close() {
+      core.close(this.rid);
+    }
+
+    closeWrite() {
+      return shutdown(this.rid);
+    }
+  }
+
+  class Listener {
+    #rid = 0;
+    #addr = null;
+
+    constructor(rid, addr) {
+      this.#rid = rid;
+      this.#addr = addr;
+    }
+
+    get rid() {
+      return this.#rid;
+    }
+
+    get addr() {
+      return this.#addr;
+    }
+
+    async accept() {
+      const res = await opAccept(this.rid, this.addr.transport);
+      return new Conn(res.rid, res.remoteAddr, res.localAddr);
+    }
+
+    async next() {
+      let conn;
+      try {
+        conn = await this.accept();
+      } catch (error) {
+        if (error instanceof BadResource) {
+          return { value: undefined, done: true };
+        }
+        throw error;
+      }
+      return { value: conn, done: false };
+    }
+
+    return(value) {
+      this.close();
+      return Promise.resolve({ value, done: true });
+    }
+
+    close() {
+      core.close(this.rid);
+    }
+
+    [Symbol.asyncIterator]() {
+      return this;
+    }
+  }
+
+  class Datagram {
+    #rid = 0;
+    #addr = null;
+
+    constructor(rid, addr, bufSize = 1024) {
+      this.#rid = rid;
+      this.#addr = addr;
+      this.bufSize = bufSize;
+    }
+
+    get rid() {
+      return this.#rid;
+    }
+
+    get addr() {
+      return this.#addr;
+    }
+
+    async receive(p) {
+      const buf = p || new Uint8Array(this.bufSize);
+      const { size, remoteAddr } = await opReceive(
+        this.rid,
+        this.addr.transport,
+        buf,
+      );
+      const sub = buf.subarray(0, size);
+      return [sub, remoteAddr];
+    }
+
+    send(p, addr) {
+      const remote = { hostname: "127.0.0.1", ...addr };
+
+      const args = { ...remote, rid: this.rid };
+      return opSend(args, p);
+    }
+
+    close() {
+      core.close(this.rid);
+    }
+
+    async *[Symbol.asyncIterator]() {
+      while (true) {
+        try {
+          yield await this.receive();
+        } catch (err) {
+          if (err instanceof BadResource) {
+            break;
+          }
+          throw err;
+        }
+      }
+    }
+  }
+
+  function listen({ hostname, ...options }) {
+    const res = opListen({
+      transport: "tcp",
+      hostname: typeof hostname === "undefined" ? "0.0.0.0" : hostname,
+      ...options,
+    });
+
+    return new Listener(res.rid, res.localAddr);
+  }
+
+  async function connect(options) {
+    let res;
+
+    if (options.transport === "unix") {
+      res = await opConnect(options);
+    } else {
+      res = await opConnect({
+        transport: "tcp",
+        hostname: "127.0.0.1",
+        ...options,
+      });
+    }
+
+    return new Conn(res.rid, res.remoteAddr, res.localAddr);
+  }
+
+  window.__bootstrap.net = {
+    connect,
+    Conn,
+    opConnect,
+    listen,
+    opListen,
+    Listener,
+    shutdown,
+    Datagram,
+    resolveDns,
+  };
+})(this);