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debugger: improve ESRCH error message #1863

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debugger: improve ESRCH error message #1863

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15 changes: 12 additions & 3 deletions lib/_debugger.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1639,7 +1639,16 @@ Interface.prototype.trySpawn = function(cb) {
} else if (this.args.length === 3) {
// `node debug -p pid`
if (this.args[1] === '-p' && /^\d+$/.test(this.args[2])) {
process._debugProcess(parseInt(this.args[2], 10));
const pid = parseInt(this.args[2], 10);
try {
process._debugProcess(pid);
} catch (e) {
if (e.code === 'ESRCH') {
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I have a question to reviewers.

process.bindings('uv') has some error definitions like ESRCH.
so we can write the following code :

const uv = process.bindings('uv');

if (e.code === uv.errname(uv.UV_ESRCH)) {
  // ...
}

is this better way? if any reviewer has some opinions, please tell me.
if this code is good, we can prevent some typos like ESCRH.

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It's alright but I wouldn't write it like that myself, it's more lines of code and harder to grok than a simple string comparison. Typos shouldn't be an issue because there should be regression tests that catch those.

console.error(`Target process: ${pid} doesn't exist.`);
process.exit(1);
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Maybe it's better to update err.message and rethrow? It's better to have a single point of exit.

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The default handle is too general, I don't know how to improve it.

  process.on('uncaughtException', function(e) {
    console.error("There was an internal error in Node's debugger. " +
        'Please report this bug.');
    console.error(e.message);
    console.error(e.stack);
    if (interface_.child) interface_.child.kill();
    process.exit(1);
  });

}
throw e;
}
isRemote = true;
} else {
var match = this.args[1].match(/^--port=(\d+)$/);
Expand Down Expand Up @@ -1704,8 +1713,8 @@ Interface.prototype.trySpawn = function(cb) {
function connectError() {
// If it's failed to connect 10 times then print failed message
if (connectionAttempts >= 10) {
self.stdout.write(' failed, please retry\n');
return;
console.error(' failed, please retry');
process.exit(1);
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Is this a debug leftover?

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It failed to connect target process.

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Seems like an arbitrary change. Leaving the return statement in is a bit odd as well.

}
setTimeout(attemptConnect, 500);
}
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39 changes: 39 additions & 0 deletions test/debugger/test-debugger-pid.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,39 @@
'use strict';
var common = require('../common');
var assert = require('assert');
var spawn = require('child_process').spawn;

var port = common.PORT + 1337;
var buffer = '';
var expected = [];
var scriptToDebug = common.fixturesDir + '/empty.js';

function fail() {
assert(0); // `--debug-brk script.js` should not quit
}

// connect to debug agent
var interfacer = spawn(process.execPath, ['debug', '-p', '655555']);

console.error(process.execPath, 'debug', '-p', '655555');
interfacer.stdout.setEncoding('utf-8');
interfacer.stderr.setEncoding('utf-8');
var onData = function (data) {
data = (buffer + data).split('\n');
buffer = data.pop();
data.forEach(function(line) {
interfacer.emit('line', line);
});
};
interfacer.stdout.on('data', onData);
interfacer.stderr.on('data', onData);

interfacer.on('line', function(line) {
line = line.replace(/^(debug> *)+/, '');
var expected = 'Target process: 655555 doesn\'t exist.';
assert.ok(expected == line, 'Got unexpected line: ' + line);
});

interfacer.on('exit', function (code, signal) {
assert.ok(code == 1, 'Got unexpected code: ' + code);
});