fix: make port 0 bind to any available port

.github/workflows/pr.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Check bundle size
         # this should match the os and version used in the release.yml
-        if: startsWith(matrix.os, 'ubuntu-22.04') && startsWith(matrix.node, '14.')
+        if: startsWith(matrix.os, 'ubuntu-22.04') && startsWith(matrix.node, '14.') && matrix.node != '14.0.0'
         # 1. build ganache
         # 2. pack it into a tarball
         # 3. measure the _unpacked_ tarball's size
@@ -65,7 +65,7 @@ jobs:
           INFURA_KEY: "badc0de0deadc0debadc0de0deadc0de"
       - name: Upload artifact
         # this should match the os and version used in the release.yml
-        if: startsWith(matrix.os, 'ubuntu-22.04') && startsWith(matrix.node, '14.')
+        if: startsWith(matrix.os, 'ubuntu-22.04') && startsWith(matrix.node, '14.') && matrix.node != '14.0.0'
         uses: actions/upload-artifact@v3
         with:
           name: Candidate

src/chains/ethereum/ethereum/package.json

@@ -87,7 +87,7 @@
     "ws": "8.2.3"
   },
   "devDependencies": {
-    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.1",
+    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.2",
     "@types/encoding-down": "5.0.0",
     "@types/fs-extra": "9.0.2",
     "@types/keccak": "3.0.1",

src/chains/filecoin/filecoin/package.json

@@ -59,7 +59,7 @@
     "@filecoin-shipyard/lotus-client-schema": "2.0.0",
     "@ganache/filecoin-options": "0.7.0",
     "@ganache/utils": "0.7.0",
-    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.1",
+    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.2",
     "@types/abstract-leveldown": "7.2.0",
     "@types/bn.js": "5.1.0",
     "@types/deep-equal": "1.0.1",

src/chains/tezos/tezos/package.json

@@ -47,7 +47,7 @@
     "emittery": "0.10.0"
   },
   "devDependencies": {
-    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.1",
+    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.2",
     "@types/mocha": "9.0.0",
     "cheerio": "1.0.0-rc.3",
     "cross-env": "7.0.3",

src/packages/cli/src/args.ts

@@ -218,7 +218,7 @@ export default function (
           })
           .check(argv => {
             const { "server.port": port, "server.host": host } = argv;
-            if (port < 1 || port > 65535) {
+            if (port < 0 || port > 65535) {
               throw new Error(`Invalid port number '${port}'`);
             }
 

src/packages/cli/src/cli.ts

@@ -138,17 +138,18 @@ if (argv.action === "start") {
       return;
     }
     started = true;
+    const { address: host, port } = server.address();
     switch (flavor) {
       case FilecoinFlavorName: {
-        await initializeFilecoin(
-          server.provider as FilecoinProvider,
-          cliSettings
-        );
+        await initializeFilecoin(server.provider as FilecoinProvider, {
+          host,
+          port
+        });
         break;
       }
       case EthereumFlavorName:
       default: {
-        initializeEthereum(server.provider as EthereumProvider, cliSettings);
+        initializeEthereum(server.provider as EthereumProvider, { host, port });
         break;
       }
     }
@@ -157,7 +158,7 @@ if (argv.action === "start") {
     // instance), so we need to notify that we are ready.
     const isDetachedInstance = process.send !== undefined;
     if (isDetachedInstance) {
-      notifyDetachedInstanceReady();
+      notifyDetachedInstanceReady(port);
     }
   });
 } else if (argv.action === "stop") {

src/packages/cli/src/detach.ts

@@ -20,7 +20,6 @@ export type DetachedInstance = {
 };
 
 const FILE_ENCODING = "utf8";
-const READY_MESSAGE = "ready";
 const START_ERROR =
   "An error occurred spawning a detached instance of Ganache:";
 const dataPath = envPaths(`Ganache/instances`, { suffix: "" }).data;
@@ -32,10 +31,10 @@ function getInstanceFilePath(instanceName: string): string {
 /**
  * Notify that the detached instance has started and is ready to receive requests.
  */
-export function notifyDetachedInstanceReady() {
-  // in "detach" mode, the parent will wait until the "ready" message is
+export function notifyDetachedInstanceReady(port: number) {
+  // in "detach" mode, the parent will wait until the port is
   // received before disconnecting from the child process.
-  process.send(READY_MESSAGE);
+  process.send(port);
 }
 
 /**
@@ -113,11 +112,13 @@ export async function startDetachedInstance(
   // event is emitted) will be streamed to stderr on the parent.
   child.stderr.pipe(process.stderr);
 
-  await new Promise<void>((resolve, reject) => {
-    child.on("message", message => {
-      if (message === READY_MESSAGE) {
-        resolve();
-      }
+  // Wait for the child process to send its port, which indicates that the
+  // Ganache server has started and is ready to receive RPC requests. It signals
+  // by sending the port number to which it was bound back to us; this is needed
+  // because Ganache may bind to a random port if the user specified port 0.
+  const port = await new Promise<number>((resolve, reject) => {
+    child.on("message", port => {
+      resolve(port as number);
     });
 
     child.on("error", err => {
@@ -146,7 +147,7 @@ export async function startDetachedInstance(
   child.disconnect();
 
   const flavor = instanceInfo.flavor;
-  const { host, port } = instanceInfo.server;
+  const { host } = instanceInfo.server;
   const cmd =
     process.platform === "win32"
       ? path.basename(process.execPath)

src/packages/core/package.json

@@ -53,7 +53,7 @@
     "@ganache/options": "0.7.0",
     "@ganache/tezos": "0.7.0",
     "@ganache/utils": "0.7.0",
-    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.1",
+    "@trufflesuite/uws-js-unofficial": "20.10.0-unofficial.2",
     "aggregate-error": "3.1.0",
     "emittery": "0.10.0"
   },

src/packages/core/src/server.ts

@@ -13,6 +13,7 @@ import type {
 import {
   App,
   us_listen_socket_close,
+  us_socket_local_port,
   _cfg as setUwsGlobalConfig
 } from "@trufflesuite/uws-js-unofficial";
 
@@ -33,6 +34,13 @@ import WebsocketServer, { WebSocketCapableFlavor } from "./servers/ws-server";
 import HttpServer from "./servers/http-server";
 import Emittery from "emittery";
 
+// not using the "net" node package in order to avoid having to polyfill this
+// for the browser build.
+// isIPv4 taken from https://github.com/nodejs/node/blob/01323d50c4b24cf730a651d06ba20633905ecbed/lib/internal/net.js#L31
+const v4Seg = "(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])";
+const IPv4Reg = new RegExp(`^(${v4Seg}[.]){3}${v4Seg}$`);
+const isIPv4 = (s: string) => IPv4Reg.test(s);
+
 export type Provider = Connector["provider"];
 
 const DEFAULT_HOST = "127.0.0.1";
@@ -43,13 +51,13 @@ export type Callback = (err: Error | null) => void;
  * Server ready state constants.
  *
  * These are bit flags. This means that you can check if the status is:
- *  * ready: `status === Status.ready` or `status & Status.ready !== 0`
- *  * opening: `status === Status.opening` or `status & Status.opening !== 0`
- *  * open: `status === Status.open` or `status & Status.open !== 0`
- *  * opening || open: `status & Status.openingOrOpen !== 0` or `status & (Status.opening | Status.open) !== 0`
- *  * closing: `status === Status.closing` or `status & Status.closing !== 0`
- *  * closed: `status === Status.closed` or `status & Status.closed !== 0`
- *  * closing || closed: `status & Status.closingOrClosed !== 0` or `status & (Status.closing | Status.closed) !== 0`
+ *  * ready: `status === ServerStatus.ready` or `status & ServerStatus.ready !== 0`
+ *  * opening: `status === ServerStatus.opening` or `status & ServerStatus.opening !== 0`
+ *  * open: `status === ServerStatus.open` or `status & ServerStatus.open !== 0`
+ *  * opening || open: `status & ServerStatus.openingOrOpen !== 0` or `status & (ServerStatus.opening | ServerStatus.open) !== 0`
+ *  * closing: `status === ServerStatus.closing` or `status & ServerStatus.closing !== 0`
+ *  * closed: `status === ServerStatus.closed` or `status & ServerStatus.closed !== 0`
+ *  * closing || closed: `status & ServerStatus.closingOrClosed !== 0` or `status & (ServerStatus.closing | ServerStatus.closed) !== 0`
  */
 export enum ServerStatus {
   /**
@@ -106,6 +114,7 @@ export class Server<
   #app: TemplatedApp | null = null;
   #httpServer: HttpServer | null = null;
   #listenSocket: us_listen_socket | null = null;
+  #host: string | null = null;
   #connector: ConnectorsByName[Flavor];
   #websocketServer: WebsocketServer | null = null;
 
@@ -183,8 +192,7 @@ export class Server<
       (typeof port !== "number" && typeof port !== "string") ||
       (typeof port === "string" && (<string>port).trim().length === 0) ||
       +port !== +port >>> 0 ||
-      port > 0xffff ||
-      port === 0
+      port > 0xffff
     ) {
       const err = new Error(
         `Port should be >= 0 and < 65536. Received ${port}.`
@@ -239,6 +247,7 @@ export class Server<
         if (listenSocket) {
           this.#status = ServerStatus.open;
           this.#listenSocket = listenSocket;
+          this.#host = (host as string) || DEFAULT_HOST;
         } else {
           this.#status = ServerStatus.closed;
           const err = new Error(
@@ -285,6 +294,19 @@ export class Server<
     }
   }
 
+  public address() {
+    if (this.#listenSocket) {
+      const address = this.#host;
+      return {
+        address,
+        family: isIPv4(address) ? "IPv4" : "IPv6",
+        port: us_socket_local_port(this.#listenSocket)
+      };
+    } else {
+      return null;
+    }
+  }
+
   public async close() {
     if (this.#status === ServerStatus.opening) {
       // if opening