debugger: move node-inspect to internal library

node-inspect developers have agreed to move node-inspect into core
rather than vendor it as a dependency.

Refs: nodejs#36481

PR-URL: nodejs#38161
Backport-PR-URL: nodejs#38858
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

lib/internal/inspector/_inspect.js

@@ -0,0 +1,369 @@
+/*
+ * Copyright Node.js contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+// TODO(trott): enable ESLint
+/* eslint-disable */
+
+'use strict';
+const { spawn } = require('child_process');
+const { EventEmitter } = require('events');
+const net = require('net');
+const util = require('util');
+
+const runAsStandalone = typeof __dirname !== 'undefined';
+
+const { 0: InspectClient, 1: createRepl } =
+  runAsStandalone ?
+  // This copy of node-inspect is on-disk, relative paths make sense.
+    [
+      require('./inspect_client'),
+      require('./inspect_repl'),
+    ] :
+  // This copy of node-inspect is built into the node executable.
+    [
+      require('internal/inspector/inspect_client'),
+      require('internal/inspector/inspect_repl'),
+    ];
+
+const debuglog = util.debuglog('inspect');
+
+class StartupError extends Error {
+  constructor(message) {
+    super(message);
+    this.name = 'StartupError';
+  }
+}
+
+function portIsFree(host, port, timeout = 9999) {
+  if (port === 0) return Promise.resolve(); // Binding to a random port.
+
+  const retryDelay = 150;
+  let didTimeOut = false;
+
+  return new Promise((resolve, reject) => {
+    setTimeout(() => {
+      didTimeOut = true;
+      reject(new StartupError(
+        `Timeout (${timeout}) waiting for ${host}:${port} to be free`));
+    }, timeout);
+
+    function pingPort() {
+      if (didTimeOut) return;
+
+      const socket = net.connect(port, host);
+      let didRetry = false;
+      function retry() {
+        if (!didRetry && !didTimeOut) {
+          didRetry = true;
+          setTimeout(pingPort, retryDelay);
+        }
+      }
+
+      socket.on('error', (error) => {
+        if (error.code === 'ECONNREFUSED') {
+          resolve();
+        } else {
+          retry();
+        }
+      });
+      socket.on('connect', () => {
+        socket.destroy();
+        retry();
+      });
+    }
+    pingPort();
+  });
+}
+
+function runScript(script, scriptArgs, inspectHost, inspectPort, childPrint) {
+  return portIsFree(inspectHost, inspectPort)
+    .then(() => {
+      return new Promise((resolve) => {
+        const needDebugBrk = process.version.match(/^v(6|7)\./);
+        const args = (needDebugBrk ?
+          ['--inspect', `--debug-brk=${inspectPort}`] :
+          [`--inspect-brk=${inspectPort}`])
+          .concat([script], scriptArgs);
+        const child = spawn(process.execPath, args);
+        child.stdout.setEncoding('utf8');
+        child.stderr.setEncoding('utf8');
+        child.stdout.on('data', childPrint);
+        child.stderr.on('data', childPrint);
+
+        let output = '';
+        function waitForListenHint(text) {
+          output += text;
+          if (/Debugger listening on ws:\/\/\[?(.+?)\]?:(\d+)\//.test(output)) {
+            const host = RegExp.$1;
+            const port = Number.parseInt(RegExp.$2);
+            child.stderr.removeListener('data', waitForListenHint);
+            resolve([child, port, host]);
+          }
+        }
+
+        child.stderr.on('data', waitForListenHint);
+      });
+    });
+}
+
+function createAgentProxy(domain, client) {
+  const agent = new EventEmitter();
+  agent.then = (...args) => {
+    // TODO: potentially fetch the protocol and pretty-print it here.
+    const descriptor = {
+      [util.inspect.custom](depth, { stylize }) {
+        return stylize(`[Agent ${domain}]`, 'special');
+      },
+    };
+    return Promise.resolve(descriptor).then(...args);
+  };
+
+  return new Proxy(agent, {
+    get(target, name) {
+      if (name in target) return target[name];
+      return function callVirtualMethod(params) {
+        return client.callMethod(`${domain}.${name}`, params);
+      };
+    },
+  });
+}
+
+class NodeInspector {
+  constructor(options, stdin, stdout) {
+    this.options = options;
+    this.stdin = stdin;
+    this.stdout = stdout;
+
+    this.paused = true;
+    this.child = null;
+
+    if (options.script) {
+      this._runScript = runScript.bind(null,
+                                       options.script,
+                                       options.scriptArgs,
+                                       options.host,
+                                       options.port,
+                                       this.childPrint.bind(this));
+    } else {
+      this._runScript =
+          () => Promise.resolve([null, options.port, options.host]);
+    }
+
+    this.client = new InspectClient();
+
+    this.domainNames = ['Debugger', 'HeapProfiler', 'Profiler', 'Runtime'];
+    this.domainNames.forEach((domain) => {
+      this[domain] = createAgentProxy(domain, this.client);
+    });
+    this.handleDebugEvent = (fullName, params) => {
+      const { 0: domain, 1: name } = fullName.split('.');
+      if (domain in this) {
+        this[domain].emit(name, params);
+      }
+    };
+    this.client.on('debugEvent', this.handleDebugEvent);
+    const startRepl = createRepl(this);
+
+    // Handle all possible exits
+    process.on('exit', () => this.killChild());
+    process.once('SIGTERM', process.exit.bind(process, 0));
+    process.once('SIGHUP', process.exit.bind(process, 0));
+
+    this.run()
+      .then(() => startRepl())
+      .then((repl) => {
+        this.repl = repl;
+        this.repl.on('exit', () => {
+          process.exit(0);
+        });
+        this.paused = false;
+      })
+      .then(null, (error) => process.nextTick(() => { throw error; }));
+  }
+
+  suspendReplWhile(fn) {
+    if (this.repl) {
+      this.repl.pause();
+    }
+    this.stdin.pause();
+    this.paused = true;
+    return new Promise((resolve) => {
+      resolve(fn());
+    }).then(() => {
+      this.paused = false;
+      if (this.repl) {
+        this.repl.resume();
+        this.repl.displayPrompt();
+      }
+      this.stdin.resume();
+    }).then(null, (error) => process.nextTick(() => { throw error; }));
+  }
+
+  killChild() {
+    this.client.reset();
+    if (this.child) {
+      this.child.kill();
+      this.child = null;
+    }
+  }
+
+  run() {
+    this.killChild();
+
+    return this._runScript().then(({ 0: child, 1: port, 2: host }) => {
+      this.child = child;
+
+      let connectionAttempts = 0;
+      const attemptConnect = () => {
+        ++connectionAttempts;
+        debuglog('connection attempt #%d', connectionAttempts);
+        this.stdout.write('.');
+        return this.client.connect(port, host)
+          .then(() => {
+            debuglog('connection established');
+            this.stdout.write(' ok');
+          }, (error) => {
+            debuglog('connect failed', error);
+            // If it's failed to connect 10 times then print failed message
+            if (connectionAttempts >= 10) {
+              this.stdout.write(' failed to connect, please retry\n');
+              process.exit(1);
+            }
+
+            return new Promise((resolve) => setTimeout(resolve, 500))
+              .then(attemptConnect);
+          });
+      };
+
+      this.print(`connecting to ${host}:${port} ..`, true);
+      return attemptConnect();
+    });
+  }
+
+  clearLine() {
+    if (this.stdout.isTTY) {
+      this.stdout.cursorTo(0);
+      this.stdout.clearLine(1);
+    } else {
+      this.stdout.write('\b');
+    }
+  }
+
+  print(text, oneline = false) {
+    this.clearLine();
+    this.stdout.write(oneline ? text : `${text}\n`);
+  }
+
+  childPrint(text) {
+    this.print(
+      text.toString()
+        .split(/\r\n|\r|\n/g)
+        .filter((chunk) => !!chunk)
+        .map((chunk) => `< ${chunk}`)
+        .join('\n')
+    );
+    if (!this.paused) {
+      this.repl.displayPrompt(true);
+    }
+    if (/Waiting for the debugger to disconnect\.\.\.\n$/.test(text)) {
+      this.killChild();
+    }
+  }
+}
+
+function parseArgv([target, ...args]) {
+  let host = '127.0.0.1';
+  let port = 9229;
+  let isRemote = false;
+  let script = target;
+  let scriptArgs = args;
+
+  const hostMatch = target.match(/^([^:]+):(\d+)$/);
+  const portMatch = target.match(/^--port=(\d+)$/);
+
+  if (hostMatch) {
+    // Connecting to remote debugger
+    host = hostMatch[1];
+    port = parseInt(hostMatch[2], 10);
+    isRemote = true;
+    script = null;
+  } else if (portMatch) {
+    // Start on custom port
+    port = parseInt(portMatch[1], 10);
+    script = args[0];
+    scriptArgs = args.slice(1);
+  } else if (args.length === 1 && /^\d+$/.test(args[0]) && target === '-p') {
+    // Start debugger against a given pid
+    const pid = parseInt(args[0], 10);
+    try {
+      process._debugProcess(pid);
+    } catch (e) {
+      if (e.code === 'ESRCH') {
+        console.error(`Target process: ${pid} doesn't exist.`);
+        process.exit(1);
+      }
+      throw e;
+    }
+    script = null;
+    isRemote = true;
+  }
+
+  return {
+    host, port, isRemote, script, scriptArgs,
+  };
+}
+
+function startInspect(argv = process.argv.slice(2),
+                      stdin = process.stdin,
+                      stdout = process.stdout) {
+  if (argv.length < 1) {
+    const invokedAs = runAsStandalone ?
+      'node-inspect' :
+      `${process.argv0} ${process.argv[1]}`;
+
+    console.error(`Usage: ${invokedAs} script.js`);
+    console.error(`       ${invokedAs} <host>:<port>`);
+    console.error(`       ${invokedAs} -p <pid>`);
+    process.exit(1);
+  }
+
+  const options = parseArgv(argv);
+  const inspector = new NodeInspector(options, stdin, stdout);
+
+  stdin.resume();
+
+  function handleUnexpectedError(e) {
+    if (!(e instanceof StartupError)) {
+      console.error('There was an internal error in Node.js. ' +
+                    'Please report this bug.');
+      console.error(e.message);
+      console.error(e.stack);
+    } else {
+      console.error(e.message);
+    }
+    if (inspector.child) inspector.child.kill();
+    process.exit(1);
+  }
+
+  process.on('uncaughtException', handleUnexpectedError);
+}
+exports.start = startInspect;