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inspector-cli.js
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inspector-cli.js
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'use strict';
const common = require('../common');
const spawn = require('child_process').spawn;
const BREAK_MESSAGE = new RegExp('(?:' + [
'assert', 'break', 'break on start', 'debugCommand',
'exception', 'other', 'promiseRejection',
].join('|') + ') in', 'i');
const TIMEOUT = common.platformTimeout(5000);
function isPreBreak(output) {
return /Break on start/.test(output) && /1 \(function \(exports/.test(output);
}
function startCLI(args, flags = [], spawnOpts = {}) {
let stderrOutput = '';
const child =
spawn(process.execPath, [...flags, 'inspect', ...args], spawnOpts);
const outputBuffer = [];
function bufferOutput(chunk) {
if (this === child.stderr) {
stderrOutput += chunk;
}
// TODO(trott): Figure out why the "breakpoints restored." message appears
// in unpredictable places especially on AIX in CI. We shouldn't be
// excluding it, but it gets in the way of the output checking for tests.
outputBuffer.push(chunk.replace(/\n*\d+ breakpoints restored\.\n*/mg, ''));
}
function getOutput() {
return outputBuffer.join('\n').replaceAll('\b', '');
}
child.stdout.setEncoding('utf8');
child.stdout.on('data', bufferOutput);
child.stderr.setEncoding('utf8');
child.stderr.on('data', bufferOutput);
if (process.env.VERBOSE === '1') {
child.stdout.pipe(process.stdout);
child.stderr.pipe(process.stderr);
}
return {
flushOutput() {
const output = this.output;
outputBuffer.length = 0;
return output;
},
waitFor(pattern) {
function checkPattern(str) {
if (Array.isArray(pattern)) {
return pattern.every((p) => p.test(str));
}
return pattern.test(str);
}
return new Promise((resolve, reject) => {
function checkOutput() {
if (checkPattern(getOutput())) {
tearDown();
resolve();
}
}
function onChildClose(code, signal) {
tearDown();
let message = 'Child exited';
if (code) {
message += `, code ${code}`;
}
if (signal) {
message += `, signal ${signal}`;
}
message += ` while waiting for ${pattern}; found: ${this.output}`;
if (stderrOutput) {
message += `\n STDERR: ${stderrOutput}`;
}
reject(new Error(message));
}
const timer = setTimeout(() => {
tearDown();
reject(new Error([
`Timeout (${TIMEOUT}) while waiting for ${pattern}`,
`found: ${this.output}`,
].join('; ')));
}, TIMEOUT);
function tearDown() {
clearTimeout(timer);
child.stdout.removeListener('data', checkOutput);
child.removeListener('close', onChildClose);
}
child.on('close', onChildClose);
child.stdout.on('data', checkOutput);
checkOutput();
});
},
waitForPrompt() {
return this.waitFor(/>\s+$/);
},
waitForInitialBreak() {
return this.waitFor(/break (?:on start )?in/i)
.then(() => {
if (isPreBreak(this.output)) {
return this.command('next', false)
.then(() => this.waitFor(/break in/));
}
});
},
get breakInfo() {
const output = this.output;
const breakMatch =
output.match(/break (?:on start )?in ([^\n]+):(\d+)\n/i);
if (breakMatch === null) {
throw new Error(
`Could not find breakpoint info in ${JSON.stringify(output)}`);
}
return { filename: breakMatch[1], line: +breakMatch[2] };
},
ctrlC() {
return this.command('.interrupt');
},
get output() {
return getOutput();
},
get rawOutput() {
return outputBuffer.join('').toString();
},
parseSourceLines() {
return getOutput().split('\n')
.map((line) => line.match(/(?:\*|>)?\s*(\d+)/))
.filter((match) => match !== null)
.map((match) => +match[1]);
},
writeLine(input, flush = true) {
if (flush) {
this.flushOutput();
}
if (process.env.VERBOSE === '1') {
process.stderr.write(`< ${input}\n`);
}
child.stdin.write(input);
child.stdin.write('\n');
},
command(input, flush = true) {
this.writeLine(input, flush);
return this.waitForPrompt();
},
stepCommand(input) {
this.writeLine(input, true);
return this
.waitFor(BREAK_MESSAGE)
.then(() => this.waitForPrompt());
},
quit() {
return new Promise((resolve) => {
child.stdin.end();
child.on('close', resolve);
});
},
};
}
module.exports = startCLI;