dial/listen API change (#3000)

Previously: dial("tcp", "deno.land:80")
Now: dial({ hostname: "deno.land", port: 80, transport: "tcp" })
Similarly with listen().

cli/ops/net.rs

@@ -49,8 +49,9 @@ pub fn op_accept(
 
 #[derive(Deserialize)]
 struct DialArgs {
-  network: String,
-  address: String,
+  transport: String,
+  hostname: String,
+  port: u16,
 }
 
 pub fn op_dial(
@@ -59,9 +60,11 @@ pub fn op_dial(
   _zero_copy: Option<PinnedBuf>,
 ) -> Result<JsonOp, ErrBox> {
   let args: DialArgs = serde_json::from_value(args)?;
-  let network = args.network;
-  assert_eq!(network, "tcp"); // TODO Support others.
-  let address = args.address;
+  assert_eq!(args.transport, "tcp"); // TODO Support others.
+
+  // TODO(ry) Using format! is suboptimal here. Better would be if
+  // state.check_net and resolve_addr() took hostname and port directly.
+  let address = format!("{}:{}", args.hostname, args.port);
 
   state.check_net(&address)?;
 
@@ -117,8 +120,9 @@ pub fn op_shutdown(
 
 #[derive(Deserialize)]
 struct ListenArgs {
-  network: String,
-  address: String,
+  transport: String,
+  hostname: String,
+  port: u16,
 }
 
 pub fn op_listen(
@@ -127,10 +131,11 @@ pub fn op_listen(
   _zero_copy: Option<PinnedBuf>,
 ) -> Result<JsonOp, ErrBox> {
   let args: ListenArgs = serde_json::from_value(args)?;
+  assert_eq!(args.transport, "tcp");
 
-  let network = args.network;
-  assert_eq!(network, "tcp");
-  let address = args.address;
+  // TODO(ry) Using format! is suboptimal here. Better would be if
+  // state.check_net and resolve_addr() took hostname and port directly.
+  let address = format!("{}:{}", args.hostname, args.port);
 
   state.check_net(&address)?;
 

cli/tests/echo_server.ts

 const { args, listen, copy } = Deno;
 const addr = args[1] || "127.0.0.1:4544";
-const listener = listen("tcp", addr);
+const [hostname, port] = addr.split(":");
+const listener = listen({ hostname, port: Number(port) });
 console.log("listening on", addr);
 listener.accept().then(
   async (conn): Promise<void> => {

std @ 43aafbf3

-Subproject commit 6663e698d08147ae0a736d1df52ffd857729d3da
+Subproject commit 43aafbf33285753e7b42230f0eb7969b300f71cf

js/fetch_test.ts

@@ -264,7 +264,7 @@ testPerm({ net: true }, async function fetchUserAgent(): Promise<void> {
 
 /*
 function bufferServer(addr: string): Deno.Buffer {
-  const listener = Deno.listen("tcp", addr);
+  const listener = Deno.listen(addr);
   const buf = new Deno.Buffer();
   listener.accept().then(async conn => {
     const p1 = buf.readFrom(conn);

js/lib.deno_runtime.d.ts

@@ -914,11 +914,12 @@ declare namespace Deno {
 
   // @url js/net.d.ts
 
-  type Network = "tcp";
+  type Transport = "tcp";
   interface Addr {
-    network: Network;
+    transport: Transport;
     address: string;
   }
+
   /** A Listener is a generic network listener for stream-oriented protocols. */
   export interface Listener extends AsyncIterator<Conn> {
     /** Waits for and resolves to the next connection to the `Listener`. */
@@ -947,52 +948,56 @@ declare namespace Deno {
      */
     closeWrite(): void;
   }
-  /** Listen announces on the local network address.
+
+  export interface ListenOptions {
+    port: number;
+    hostname?: string;
+    transport?: Transport;
+  }
+
+  /** Listen announces on the local transport address.
    *
-   * The network must be `tcp`, `tcp4`, `tcp6`, `unix` or `unixpacket`.
+   * @param options
+   * @param options.port The port to connect to. (Required.)
+   * @param options.hostname A literal IP address or host name that can be
+   *   resolved to an IP address. If not specified, defaults to 0.0.0.0
+   * @param options.transport Defaults to "tcp". Later we plan to add "tcp4",
+   *   "tcp6", "udp", "udp4", "udp6", "ip", "ip4", "ip6", "unix", "unixgram" and
+   *   "unixpacket".
    *
-   * For TCP networks, if the host in the address parameter is empty or a literal
-   * unspecified IP address, `listen()` listens on all available unicast and
-   * anycast IP addresses of the local system. To only use IPv4, use network
-   * `tcp4`. The address can use a host name, but this is not recommended,
-   * because it will create a listener for at most one of the host's IP
-   * addresses. If the port in the address parameter is empty or `0`, as in
-   * `127.0.0.1:` or `[::1]:0`, a port number is automatically chosen. The
-   * `addr()` method of `Listener` can be used to discover the chosen port.
+   * Examples:
    *
-   * See `dial()` for a description of the network and address parameters.
+   *     listen({ port: 80 })
+   *     listen({ hostname: "192.0.2.1", port: 80 })
+   *     listen({ hostname: "[2001:db8::1]", port: 80 });
+   *     listen({ hostname: "golang.org", port: 80, transport: "tcp" })
    */
-  export function listen(network: Network, address: string): Listener;
-  /** Dial connects to the address on the named network.
-   *
-   * Supported networks are only `tcp` currently.
-   *
-   * TODO: `tcp4` (IPv4-only), `tcp6` (IPv6-only), `udp`, `udp4` (IPv4-only),
-   * `udp6` (IPv6-only), `ip`, `ip4` (IPv4-only), `ip6` (IPv6-only), `unix`,
-   * `unixgram` and `unixpacket`.
+  export function listen(options: ListenOptions): Listener;
+
+  export interface DialOptions {
+    port: number;
+    hostname?: string;
+    transport?: Transport;
+  }
+
+  /** Dial connects to the address on the named transport.
    *
-   * For TCP and UDP networks, the address has the form `host:port`. The host must
-   * be a literal IP address, or a host name that can be resolved to IP addresses.
-   * The port must be a literal port number or a service name. If the host is a
-   * literal IPv6 address it must be enclosed in square brackets, as in
-   * `[2001:db8::1]:80` or `[fe80::1%zone]:80`. The zone specifies the scope of
-   * the literal IPv6 address as defined in RFC 4007. The functions JoinHostPort
-   * and SplitHostPort manipulate a pair of host and port in this form. When using
-   * TCP, and the host resolves to multiple IP addresses, Dial will try each IP
-   * address in order until one succeeds.
+   * @param options
+   * @param options.port The port to connect to. (Required.)
+   * @param options.hostname A literal IP address or host name that can be
+   *   resolved to an IP address. If not specified, defaults to 127.0.0.1
+   * @param options.transport Defaults to "tcp". Later we plan to add "tcp4",
+   *   "tcp6", "udp", "udp4", "udp6", "ip", "ip4", "ip6", "unix", "unixgram" and
+   *   "unixpacket".
    *
    * Examples:
    *
-   *     dial("tcp", "golang.org:http")
-   *     dial("tcp", "192.0.2.1:http")
-   *     dial("tcp", "198.51.100.1:80")
-   *     dial("udp", "[2001:db8::1]:domain")
-   *     dial("udp", "[fe80::1%lo0]:53")
-   *     dial("tcp", ":80")
+   *     dial({ port: 80 })
+   *     dial({ hostname: "192.0.2.1", port: 80 })
+   *     dial({ hostname: "[2001:db8::1]", port: 80 });
+   *     dial({ hostname: "golang.org", port: 80, transport: "tcp" })
    */
-  export function dial(network: Network, address: string): Promise<Conn>;
-  /** **RESERVED** */
-  export function connect(_network: Network, _address: string): Promise<Conn>;
+  export function dial(options: DialOptions): Promise<Conn>;
 
   // @url js/metrics.d.ts
 

js/net.ts

@@ -5,16 +5,18 @@ import { read, write, close } from "./files.ts";
 import * as dispatch from "./dispatch.ts";
 import { sendSync, sendAsync } from "./dispatch_json.ts";
 
-export type Network = "tcp";
+export type Transport = "tcp";
 // TODO support other types:
-// export type Network = "tcp" | "tcp4" | "tcp6" | "unix" | "unixpacket";
+// export type Transport = "tcp" | "tcp4" | "tcp6" | "unix" | "unixpacket";
 
+// TODO(ry) Replace 'address' with 'hostname' and 'port', similar to DialOptions
+// and ListenOptions.
 export interface Addr {
-  network: Network;
+  transport: Transport;
   address: string;
 }
 
-/** A Listener is a generic network listener for stream-oriented protocols. */
+/** A Listener is a generic transport listener for stream-oriented protocols. */
 export interface Listener extends AsyncIterator<Conn> {
   /** Waits for and resolves to the next connection to the `Listener`. */
   accept(): Promise<Conn>;
@@ -79,7 +81,7 @@ class ConnImpl implements Conn {
 class ListenerImpl implements Listener {
   constructor(
     readonly rid: number,
-    private network: Network,
+    private transport: Transport,
     private localAddr: string
   ) {}
 
@@ -94,7 +96,7 @@ class ListenerImpl implements Listener {
 
   addr(): Addr {
     return {
-      network: this.network,
+      transport: this.transport,
       address: this.localAddr
     };
   }
@@ -128,62 +130,70 @@ export interface Conn extends Reader, Writer, Closer {
   closeWrite(): void;
 }
 
-/** Listen announces on the local network address.
+export interface ListenOptions {
+  port: number;
+  hostname?: string;
+  transport?: Transport;
+}
+const listenDefaults = { hostname: "0.0.0.0", transport: "tcp" };
+
+/** Listen announces on the local transport address.
  *
- * The network must be `tcp`, `tcp4`, `tcp6`, `unix` or `unixpacket`.
+ * @param options
+ * @param options.port The port to connect to. (Required.)
+ * @param options.hostname A literal IP address or host name that can be
+ *   resolved to an IP address. If not specified, defaults to 0.0.0.0
+ * @param options.transport Defaults to "tcp". Later we plan to add "tcp4",
+ *   "tcp6", "udp", "udp4", "udp6", "ip", "ip4", "ip6", "unix", "unixgram" and
+ *   "unixpacket".
  *
- * For TCP networks, if the host in the address parameter is empty or a literal
- * unspecified IP address, `listen()` listens on all available unicast and
- * anycast IP addresses of the local system. To only use IPv4, use network
- * `tcp4`. The address can use a host name, but this is not recommended,
- * because it will create a listener for at most one of the host's IP
- * addresses. If the port in the address parameter is empty or `0`, as in
- * `127.0.0.1:` or `[::1]:0`, a port number is automatically chosen. The
- * `addr()` method of `Listener` can be used to discover the chosen port.
+ * Examples:
  *
- * See `dial()` for a description of the network and address parameters.
+ *     listen({ port: 80 })
+ *     listen({ hostname: "192.0.2.1", port: 80 })
+ *     listen({ hostname: "[2001:db8::1]", port: 80 });
+ *     listen({ hostname: "golang.org", port: 80, transport: "tcp" })
  */
-export function listen(network: Network, address: string): Listener {
-  const res = sendSync(dispatch.OP_LISTEN, { network, address });
-  return new ListenerImpl(res.rid, network, res.localAddr);
+export function listen(options: ListenOptions): Listener {
+  options = Object.assign(listenDefaults, options);
+  const res = sendSync(dispatch.OP_LISTEN, options);
+  return new ListenerImpl(res.rid, options.transport, res.localAddr);
 }
 
-/** Dial connects to the address on the named network.
- *
- * Supported networks are only `tcp` currently.
- *
- * TODO: `tcp4` (IPv4-only), `tcp6` (IPv6-only), `udp`, `udp4` (IPv4-only),
- * `udp6` (IPv6-only), `ip`, `ip4` (IPv4-only), `ip6` (IPv6-only), `unix`,
- * `unixgram` and `unixpacket`.
+export interface DialOptions {
+  port: number;
+  hostname?: string;
+  transport?: Transport;
+}
+const dialDefaults = { hostname: "127.0.0.1", transport: "tcp" };
+
+/** Dial connects to the address on the named transport.
  *
- * For TCP and UDP networks, the address has the form `host:port`. The host must
- * be a literal IP address, or a host name that can be resolved to IP addresses.
- * The port must be a literal port number or a service name. If the host is a
- * literal IPv6 address it must be enclosed in square brackets, as in
- * `[2001:db8::1]:80` or `[fe80::1%zone]:80`. The zone specifies the scope of
- * the literal IPv6 address as defined in RFC 4007. The functions JoinHostPort
- * and SplitHostPort manipulate a pair of host and port in this form. When using
- * TCP, and the host resolves to multiple IP addresses, Dial will try each IP
- * address in order until one succeeds.
+ * @param options
+ * @param options.port The port to connect to. (Required.)
+ * @param options.hostname A literal IP address or host name that can be
+ *   resolved to an IP address. If not specified, defaults to 127.0.0.1
+ * @param options.transport Defaults to "tcp". Later we plan to add "tcp4",
+ *   "tcp6", "udp", "udp4", "udp6", "ip", "ip4", "ip6", "unix", "unixgram" and
+ *   "unixpacket".
  *
  * Examples:
  *
- *     dial("tcp", "golang.org:http")
- *     dial("tcp", "192.0.2.1:http")
- *     dial("tcp", "198.51.100.1:80")
- *     dial("udp", "[2001:db8::1]:domain")
- *     dial("udp", "[fe80::1%lo0]:53")
- *     dial("tcp", ":80")
+ *     dial({ port: 80 })
+ *     dial({ hostname: "192.0.2.1", port: 80 })
+ *     dial({ hostname: "[2001:db8::1]", port: 80 });
+ *     dial({ hostname: "golang.org", port: 80, transport: "tcp" })
  */
-export async function dial(network: Network, address: string): Promise<Conn> {
-  const res = await sendAsync(dispatch.OP_DIAL, { network, address });
+export async function dial(options: DialOptions): Promise<Conn> {
+  options = Object.assign(dialDefaults, options);
+  const res = await sendAsync(dispatch.OP_DIAL, options);
   // TODO(bartlomieju): add remoteAddr and localAddr on Rust side
   return new ConnImpl(res.rid, res.remoteAddr!, res.localAddr!);
 }
 
 /** **RESERVED** */
 export async function connect(
-  _network: Network,
+  _transport: Transport,
   _address: string
 ): Promise<Conn> {
   return notImplemented();

js/net_test.ts

@@ -2,15 +2,17 @@
 import { testPerm, assert, assertEquals } from "./test_util.ts";
 
 testPerm({ net: true }, function netListenClose(): void {
-  const listener = Deno.listen("tcp", "127.0.0.1:4500");
+  const listener = Deno.listen({ hostname: "127.0.0.1", port: 4500 });
   const addr = listener.addr();
-  assertEquals(addr.network, "tcp");
+  assertEquals(addr.transport, "tcp");
+  // TODO(ry) Replace 'address' with 'hostname' and 'port', similar to
+  // DialOptions and ListenOptions.
   assertEquals(addr.address, "127.0.0.1:4500");
   listener.close();
 });
 
 testPerm({ net: true }, async function netCloseWhileAccept(): Promise<void> {
-  const listener = Deno.listen("tcp", ":4501");
+  const listener = Deno.listen({ port: 4501 });
   const p = listener.accept();
   listener.close();
   let err;
@@ -25,7 +27,7 @@ testPerm({ net: true }, async function netCloseWhileAccept(): Promise<void> {
 });
 
 testPerm({ net: true }, async function netConcurrentAccept(): Promise<void> {
-  const listener = Deno.listen("tcp", ":4502");
+  const listener = Deno.listen({ port: 4502 });
   let acceptErrCount = 0;
   const checkErr = (e): void => {
     assertEquals(e.kind, Deno.ErrorKind.Other);
@@ -46,7 +48,7 @@ testPerm({ net: true }, async function netConcurrentAccept(): Promise<void> {
 });
 
 testPerm({ net: true }, async function netDialListen(): Promise<void> {
-  const listener = Deno.listen("tcp", ":4500");
+  const listener = Deno.listen({ port: 4500 });
   listener.accept().then(
     async (conn): Promise<void> => {
       assert(conn.remoteAddr != null);
@@ -55,7 +57,7 @@ testPerm({ net: true }, async function netDialListen(): Promise<void> {
       conn.close();
     }
   );
-  const conn = await Deno.dial("tcp", "127.0.0.1:4500");
+  const conn = await Deno.dial({ hostname: "127.0.0.1", port: 4500 });
   assertEquals(conn.remoteAddr, "127.0.0.1:4500");
   assert(conn.localAddr != null);
   const buf = new Uint8Array(1024);
@@ -77,7 +79,7 @@ testPerm({ net: true }, async function netDialListen(): Promise<void> {
 
 /* TODO(ry) Re-enable this test.
 testPerm({ net: true }, async function netListenAsyncIterator(): Promise<void> {
-  const listener = Deno.listen("tcp", ":4500");
+  const listener = Deno.listen(":4500");
   const runAsyncIterator = async (): Promise<void> => {
     for await (let conn of listener) {
       await conn.write(new Uint8Array([1, 2, 3]));
@@ -85,7 +87,7 @@ testPerm({ net: true }, async function netListenAsyncIterator(): Promise<void> {
     }
   };
   runAsyncIterator();
-  const conn = await Deno.dial("tcp", "127.0.0.1:4500");
+  const conn = await Deno.dial("127.0.0.1:4500");
   const buf = new Uint8Array(1024);
   const readResult = await conn.read(buf);
   assertEquals(3, readResult);
@@ -107,7 +109,7 @@ testPerm({ net: true }, async function netListenAsyncIterator(): Promise<void> {
 /* TODO Fix broken test.
 testPerm({ net: true }, async function netCloseReadSuccess() {
   const addr = "127.0.0.1:4500";
-  const listener = Deno.listen("tcp", addr);
+  const listener = Deno.listen(addr);
   const closeDeferred = deferred();
   const closeReadDeferred = deferred();
   listener.accept().then(async conn => {
@@ -122,7 +124,7 @@ testPerm({ net: true }, async function netCloseReadSuccess() {
     conn.close();
     closeDeferred.resolve();
   });
-  const conn = await Deno.dial("tcp", addr);
+  const conn = await Deno.dial(addr);
   conn.closeRead(); // closing read
   closeReadDeferred.resolve();
   const buf = new Uint8Array(1024);
@@ -139,14 +141,14 @@ testPerm({ net: true }, async function netCloseReadSuccess() {
 /* TODO Fix broken test.
 testPerm({ net: true }, async function netDoubleCloseRead() {
   const addr = "127.0.0.1:4500";
-  const listener = Deno.listen("tcp", addr);
+  const listener = Deno.listen(addr);
   const closeDeferred = deferred();
   listener.accept().then(async conn => {
     await conn.write(new Uint8Array([1, 2, 3]));
     await closeDeferred.promise;
     conn.close();
   });
-  const conn = await Deno.dial("tcp", addr);
+  const conn = await Deno.dial(addr);
   conn.closeRead(); // closing read
   let err;
   try {
@@ -167,14 +169,14 @@ testPerm({ net: true }, async function netDoubleCloseRead() {
 /* TODO Fix broken test.
 testPerm({ net: true }, async function netCloseWriteSuccess() {
   const addr = "127.0.0.1:4500";
-  const listener = Deno.listen("tcp", addr);
+  const listener = Deno.listen(addr);
   const closeDeferred = deferred();
   listener.accept().then(async conn => {
     await conn.write(new Uint8Array([1, 2, 3]));
     await closeDeferred.promise;
     conn.close();
   });
-  const conn = await Deno.dial("tcp", addr);
+  const conn = await Deno.dial(addr);
   conn.closeWrite(); // closing write
   const buf = new Uint8Array(1024);
   // Check read not impacted
@@ -202,13 +204,13 @@ testPerm({ net: true }, async function netCloseWriteSuccess() {
 /* TODO Fix broken test.
 testPerm({ net: true }, async function netDoubleCloseWrite() {
   const addr = "127.0.0.1:4500";
-  const listener = Deno.listen("tcp", addr);
+  const listener = Deno.listen(addr);
   const closeDeferred = deferred();
   listener.accept().then(async conn => {
     await closeDeferred.promise;
     conn.close();
   });
-  const conn = await Deno.dial("tcp", addr);
+  const conn = await Deno.dial(addr);
   conn.closeWrite(); // closing write
   let err;
   try {

js/resources_test.ts

@@ -10,10 +10,8 @@ test(function resourcesStdio(): void {
 });
 
 testPerm({ net: true }, async function resourcesNet(): Promise<void> {
-  const addr = "127.0.0.1:4501";
-  const listener = Deno.listen("tcp", addr);
-
-  const dialerConn = await Deno.dial("tcp", addr);
+  const listener = Deno.listen({ port: 4501 });
+  const dialerConn = await Deno.dial({ port: 4501 });
   const listenerConn = await listener.accept();
 
   const res = Deno.resources();

tools/benchmark.py

@@ -211,8 +211,8 @@ def run_http(build_dir, new_data):
 
 def bundle_benchmark(deno_exe):
     bundles = {
-        "file_server": "https://deno.land/std/http/file_server.ts",
-        "gist": "https://deno.land/std/examples/gist.ts",
+        "file_server": "./js/deps/https/deno.land/std/http/file_server.ts",
+        "gist": "./js/deps/https/deno.land/std/examples/gist.ts",
     }
 
     sizes = {}

tools/complex_permissions_test.ts

@@ -16,13 +16,15 @@ const test: (args: string[]) => void = {
   },
   netListen(hosts: string[]): void {
     hosts.forEach(host => {
-      const listener = Deno.listen("tcp", host);
+      const [hostname, port] = host.split(":");
+      const listener = Deno.listen({ hostname, port: Number(port) });
       listener.close();
     });
   },
   async netDial(hosts: string[]): Promise<void> {
     for (const host of hosts) {
-      const listener = await Deno.dial("tcp", host);
+      const [hostname, port] = host.split(":");
+      const listener = await Deno.dial({ hostname, port: Number(port) });
       listener.close();
     }
   }

tools/deno_tcp.ts

@@ -3,7 +3,8 @@
 // https://github.com/denoland/deno/issues/726 is completed.
 // Note: this is a keep-alive server.
 const addr = Deno.args[1] || "127.0.0.1:4500";
-const listener = Deno.listen("tcp", addr);
+const [hostname, port] = addr.split(":");
+const listener = Deno.listen({ hostname, port: Number(port) });
 const response = new TextEncoder().encode(
   "HTTP/1.1 200 OK\r\nContent-Length: 12\r\n\r\nHello World\n"
 );

tools/deno_tcp_proxy.ts

@@ -2,10 +2,16 @@
 const addr = Deno.args[1] || "127.0.0.1:4500";
 const originAddr = Deno.args[2] || "127.0.0.1:4501";
 
-const listener = Deno.listen("tcp", addr);
+const [hostname, port] = addr.split(":");
+const [originHostname, originPort] = originAddr.split(":");
+
+const listener = Deno.listen({ hostname, port: Number(port) });
 
 async function handle(conn: Deno.Conn): Promise<void> {
-  const origin = await Deno.dial("tcp", originAddr);
+  const origin = await Deno.dial({
+    hostname: originHostname,
+    port: Number(originPort)
+  });
   try {
     await Promise.all([Deno.copy(conn, origin), Deno.copy(origin, conn)]);
   } catch (err) {

tools/http_benchmark.py

@@ -49,13 +49,7 @@ def deno_http(deno_exe):
         "js/deps/https/deno.land/std/http/http_bench.ts", addr
     ]
     print "http_benchmark testing DENO using net/http."
-    return run(
-        deno_cmd,
-        addr,
-        merge_env={
-            # Load from //js/deps/https/deno.land/net/ submodule.
-            "DENO_DIR": os.path.join(util.root_path, "js")
-        })
+    return run(deno_cmd, addr)
 
 
 def deno_tcp_proxy(deno_exe, hyper_hello_exe):
@@ -69,7 +63,6 @@ def deno_tcp_proxy(deno_exe, hyper_hello_exe):
     return run(
         deno_cmd,
         addr,
-        merge_env={"DENO_DIR": os.path.join(util.root_path, "js")},
         origin_cmd=http_proxy_origin(hyper_hello_exe, origin_addr))
 
 
@@ -84,7 +77,6 @@ def deno_http_proxy(deno_exe, hyper_hello_exe):
     return run(
         deno_cmd,
         addr,
-        merge_env={"DENO_DIR": os.path.join(util.root_path, "js")},
         origin_cmd=http_proxy_origin(hyper_hello_exe, origin_addr))
 
 

tools/permission_prompt_test.ts

 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-const { args, listen, env, exit, makeTempDirSync, readFileSync, run } = Deno;
+const { args, env, exit, makeTempDirSync, readFileSync, run } = Deno;
 
 const firstCheckFailedMessage = "First check failed";
 
@@ -31,11 +31,11 @@ const test = {
   },
   needsNet(): void {
     try {
-      listen("tcp", "127.0.0.1:4540");
+      Deno.listen({ hostname: "127.0.0.1", port: 4540 });
     } catch (e) {
       console.log(firstCheckFailedMessage);
     }
-    listen("tcp", "127.0.0.1:4541");
+    Deno.listen({ hostname: "127.0.0.1", port: 4541 });
   },
   needsRun(): void {
     try {