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Multiple fixes and prettification of errors
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Fixes multiple outstanding issues, and pretifies error output by:

  1. using pretty-error to render the error
  2. stripping part of the stack that really should have no relevance

Fixes mage#4 mage#5 mage#8 mage#9 mage#11
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@stelcheck
stelcheck committed Dec 6, 2017
1 parent aba01a5 commit ed32bb5
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Showing 4 changed files with 1,620 additions and 67 deletions.
6 changes: 6 additions & 0 deletions Readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,12 @@ external:
# Where to put the socket file for the console.
# Default: [project-dir]/node_modules/mage-console/mage-console.sock
sockfile: /tmp/mage-console.sock

# Watch additional files; we will always watch `./config' and './lib',
# but you may want to watch additional folders as well.
watch:
- /tmp/file
- ./www
```
Debugging
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243 changes: 176 additions & 67 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,39 +6,16 @@ var chalk = require('chalk');
var path = require('path');
var cluster = require('cluster');
var fs = require('fs');
var PrettyError = require('pretty-error');
var watch = require('node-watch');
var MemoryStream = require('memorystream');

var HISTORY_FILE = path.join(process.env.HOME, '.mage-history.json');
var APP_LIB_PATH = path.join(process.cwd(), 'lib');
var APP_CONFIG_PATH = path.join(process.cwd(), 'config');

var debug = require('./debug');

function onceSomeFilesChanged(onChange) {
var called = false;
var watcher = watch(APP_LIB_PATH, {
recursive: true
}, function (event, name) {
if (name.split(path.sep).pop()[0] === '.') {
return;
}

if (called) {
return;
}

called = true;
watcher.close();
onChange(event, name);
});
}

/**
* exports.eval can be used to customise how the code and commands
* will be interpreted in the REPL interface - null means default node
* behaviour
*/
exports.eval = null;
var prettyError = new PrettyError();

/**
* Additional prefix to set on the REPL's prompt
Expand All @@ -51,25 +28,62 @@ exports.promptPrefix = '';
exports.debugFlag = '--debug';

/**
* Boot mage
* Force-configure mage to use cluster: 1 (one master, one process),
* and set the list of files and folders to watch for.
*/
var config = require('../mage/lib/config');
config.set('server.cluster', 1);

var WATCH_FILES = config.get('external.mage-console.watch', []);

WATCH_FILES.push(APP_CONFIG_PATH);
WATCH_FILES.push(APP_LIB_PATH);

/**
* Load the application and boot
*/
var mage = require(APP_LIB_PATH);
var logger = mage.core.logger.context('REPL');
var processManager = mage.core.processManager;

mage.boot();

var clusterConfiguration = mage.core.config.get('server.cluster');
function setRawMode(val) {
var stdin = process.stdin;

if (!stdin.setRawMode) {
logger
.emergency
.details('This may happen when using terminals such as MINGW64 on Windows')
.details('Please try to use PowerShell or cmd.exe instead')
.log('Cannot run mage-console; cannot switch to raw mode');

if (clusterConfiguration !== 1) {
console.error('');
console.error('mage-console requires your application to be configured with');
console.error('"server.cluster" to 1. Please change your configuration and try again');
console.error('');
mage.quit(1, true);
}

process.exit(-1);
stdin.setRawMode(val);
}

var logger = mage.core.logger.context('REPL');
function onceSomeFilesChanged(onChange) {
var called = false;
var watcher = watch(WATCH_FILES, {
recursive: true
}, function (event, name) {
if (name.split(path.sep).pop()[0] === '.') {
return;
}

if (called) {
return;
}

called = true;
watcher.close();
onChange(event, name);
});

return watcher;
}

function crash(error) {
mage.logger.error(error);
Expand All @@ -83,7 +97,7 @@ function crash(error) {
function getIPCPath() {
// See https://github.com/nodejs/node/issues/13670 for more details
const defaultFilepath = path.relative(process.cwd(), path.join(__dirname, 'mage-console.sock'));
const filepath = mage.core.config.get('external.mage-console.sockfile') || defaultFilepath;
const filepath = config.get('external.mage-console.sockfile') || defaultFilepath;

if (process.platform === 'win32') {
return path.join('\\\\.\\pipe', filepath);
Expand All @@ -110,10 +124,57 @@ function createRepl(client, prompt) {
output: client,
useColors: true,
terminal: true,
prompt: prompt,
eval: exports.eval
prompt: prompt
});

// We wish to log REPL errors differently than how
// we log errors coming from MAGE logger, but still
// in a way that integrates with the logger (so that logs
// may still be written to file, and so on); we want the logger
// context, and we want to prettify the error output.
function logError(error) {
var newStack = error.stack.split('\n');
var done = false;
error.stack = '';

while (!done && newStack.length > 0) {
var line = newStack.shift();
error.stack += line + '\n';
if (line.indexOf(' at repl:1') !== -1) {
done = true;
}
}

var rendered = prettyError.render(error);
rendered = rendered.slice(0, -5);
rendered = rendered.replace(/\n/g, chalk.styles.red.open + '\n');
logger.error(rendered);
}

// We remove the default domain error handler on the REPL
// and replace it with our logging factory
instance._domain.removeAllListeners('error');
instance._domain.on('error', logError);

// Finally, we override the eval function.
// since we want to keep the same behavior as the normal eval
// but handle errors a bit differently, we create a normal REPL,
// store it's eval method somewhere, then override it.
var realEval = instance.eval;
instance.eval = function (cmd, context, filename, callback) {
realEval(cmd, context, filename, function (error, res) {
if (error) {
if (!error.stack) {
return callback(error);
}

logError(error);
}

callback(null, res);
});
};

// Context setup
instance.context.mage = mage;

Expand Down Expand Up @@ -153,7 +214,7 @@ function connect() {
chalk.cyan('mage/' + mage.rootPackage.name) +
chalk.magenta(' >> ');

var promptLength = chalk.stripColor(prompt).length;
var promptLength = prompt.length;
var repl = createRepl(client, prompt);

repl.on('exit', function () {
Expand All @@ -171,7 +232,7 @@ function connect() {
input: stream
});

function schedulePrompt(lineContent) {
function schedulePrompt() {
if (closing) {
return;
}
Expand All @@ -181,8 +242,7 @@ function connect() {
}

scheduled = setTimeout(function () {
realStderrWrite(prompt);
realStderrWrite(lineContent);
repl.displayPrompt(true);
}, 100);
}

Expand All @@ -201,7 +261,7 @@ function connect() {
realStderrWrite(`\r${wipeLine}\r`);
realStderrWrite(data + '\n');

schedulePrompt(lineContent);
schedulePrompt();
});

// Watch the lib folder for changes
Expand All @@ -212,6 +272,18 @@ function connect() {
});
});

// Propagate the stdout resize events to the client, so that the readline
// interface behind our REPL may process properly commands that fit on
// multiple lines
client.columns = process.stdout.columns;
client.rows = process.stdout.rows;

process.stdout.on('resize', function () {
client.columns = process.stdout.columns;
client.rows = process.stdout.rows;
client.emit('resize');
});

client.once('end', function () {
closing = true;
connect();
Expand All @@ -227,27 +299,58 @@ if (cluster.isWorker) {

// Master process provides a network server for process
// to connect to, and patches stdin/stdout/stderr into
// the connection
// the connection. It also hijacks MAGE's reload logic, so
// to allow for pauses while waiting for a restart (example:
// if the server reloads and crashes, wait for a file change
// before restarting)

processManager.on('started', function () {
cluster.removeAllListeners('exit');
cluster.on('exit', function (worker) {
worker.dropStartupTimeout();

var id = worker.mageWorkerId;
processManager.emit('workerOffline', id, worker._mageManagedExit);

// If a worker was running and it suddenly dies, we automatically
// restart it. If not, we consider something must be wrong with the
// application's code, and stall until either a file is updated or
// a key is pressed in the terminal
if (!worker._mageManagedExit) {
logger.debug('Reloading');
processManager.getWorkerManager().createWorker(id);
} else {
console.log('');
logger.warning('------------------------------------------------------');
logger.warning('Worker down, save a file or press any key to reload...');
logger.warning('------------------------------------------------------');

var stdin = process.stdin;
var waiter;

function onKeyPress() {
if (waiter) {
waiter.close();
}

stdin.pause();

processManager.getWorkerManager().createWorker(id);
}

cluster.removeAllListeners('exit');
cluster.on('exit', function (worker) {
// check if the worker was supposed to die
waiter = onceSomeFilesChanged(function (event, name) {
stdin.removeListener('data', onKeyPress);
stdin.pause();

if (!worker._mageManagedExit) {
// this exit was not supposed to happen!
// spawn a new worker to replace the dead one
logger.debug('File ' + name + ' was ' + event + 'd, reloading');

processManager.emit('workerOffline', worker.id);
onceSomeFilesChanged(function (event, name) {
logger.debug('File ' + name + ' was ' + event + 'd, reloading');
processManager.createWorker();
});
} else {
if (!processManager.getNumWorkers()) {
logger.emergency('All workers have shut down, shutting down master now.');
process.exit(0);
processManager.getWorkerManager().createWorker(id);
});

stdin.resume();
stdin.once('data', onKeyPress);
}
}
});
});

// Clean up old lingering sockets
Expand Down Expand Up @@ -323,14 +426,19 @@ cluster.on('message', function (worker, message) {
case 'reload':
closeDebuggerConnections();
logger.notice('reloading worker');
mage.core.processManager.reload(function () {
logger.notice('worker reloaded');
});
worker.kill();
break;
case 'shutdown':
closeDebuggerConnections();
logger.notice('shutting down');
mage.quit();
cluster.removeAllListeners('exit');
worker.once('exit', function () {
closeDebuggerConnection();
mage.quit();
process.exit();
});

worker.kill();

break;
}
});
Expand All @@ -340,15 +448,16 @@ var server = net.createServer(function (client) {
logger.notice('connected');

var stdin = process.stdin;
stdin.setRawMode(true);
setRawMode(true);

stdin.setEncoding('utf8');
stdin.resume();

client.pipe(process.stdout);
stdin.pipe(client);

client.on('end', function () {
stdin.setRawMode(false);
setRawMode(false);
stdin.pause();
logger.notice('disconnected');
});
Expand Down
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