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/
utils.js
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/
utils.js
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/*!
* node.io
* Copyright(c) 2010 Chris O'Hara <cohara87@gmail.com>
* MIT Licensed
*/
var cwd = process.cwd(),
fs = require('fs'),
exec = require('child_process').exec;
/**
* Outputs a styled message to the console.
*
* @param {String} msg
* @param {String} type (optional)
* @api public
*/
var status = function (msg, type) {
switch (type) {
case 'info':
msg = '\x1B[33mINFO\x1B[0m: ' + msg;
break;
case 'debug':
msg = '\x1B[36mDEBUG\x1B[0m: ' + msg;
break;
case 'error':
case 'fatal':
msg = '\x1B[31mERROR\x1B[0m: ' + msg;
break;
case 'ok':
msg = '\x1B[32mOK\x1B[0m: ' + msg;
break;
case 'bold':
msg = '\x1B[33mINFO\x1B[0m: \x1B[1m' + msg + '\x1B[0m';
break;
}
console.error(msg); //Write to stderr
if (type === 'fatal') {
process.exit(1);
}
};
exports.status = {};
['info', 'error', 'fatal', 'ok', 'debug', 'bold'].forEach(function (type) {
exports.status[type] = function (msg) {
status(msg, type);
};
});
/**
* Removes the specified file on exit.
*
* @param {String} file
* @api public
*/
exports.removeOnExit = function (file) {
var removeFile = function () {
try {
fs.unlinkSync(file);
} catch (e) {}
try {
process.exit();
} catch (e) {}
};
['SIGINT', 'SIGTERM', 'SIGKILL', 'SIGQUIT', 'SIGHUP', 'exit'].forEach(function (signal) {
process.on(signal, removeFile);
});
};
/**
* Compiles a CoffeeScript file (.coffee) using coffee(1).
*
* @param {String} coffee_file
* @param {String} compiled_file
* @param {Function} callback
* @api public
*/
exports.compile = function (compiler, coffee_file, compiled_file, callback) {
exec(compiler + ' -p -c "' + coffee_file + '"', {cwd: cwd}, function (err, stdout, stderr) {
if (err || stderr) {
callback(err || stderr);
} else {
exports.removeOnExit(compiled_file);
fs.writeFile(compiled_file, stdout, callback);
}
});
};
/**
* Calculates the CRC32 checksum of a string.
*
* @param {String} str
* @return {String} checksum
* @api public
*/
var crc32tab = [
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
];
exports.crc32 = function (str, hex) {
var crc = ~0, i;
for (i = 0; i < str.length; i++) {
crc = (crc >>> 8) ^ crc32tab[(crc ^ str.charCodeAt(i)) & 0xff];
}
crc = crc ^ (-1);
return hex ? crc.toString(16) : crc;
};
/**
* Takes an arbitrary number of arguments (objects) and copies
* ALL properties from right to left.
*
* @param {Object(s)} ...
* @return {Object}
* @api public
*/
var x = 0;
exports.put = function (o /*, args */) {
//Create o={} if not an object
if (typeof o !== 'object') o = {};
var obj = Array.prototype.slice.call(arguments,1),
i = 0, l = obj.length;
//Iterate over each subsequent object and copy properties into o
for (; i < l; i++) {
for (var j in obj[i]) {
if (obj[i].hasOwnProperty(j)) {
o[j] = obj[i][j];
}
}
}
return o;
}
/**
* Takes an arbitrary number of arguments (objects) and copies
* properties from right to left only if they don't already exist.
*
* @param {Object(s)} ...
* @return {Object}
* @api public
*/
exports.put_default = function (o /*, args */) {
//Create o={} if not an object
if (typeof o !== 'object') o = {};
var obj = Array.prototype.slice.call(arguments,1),
i = 0, l = obj.length;
//Iterate over each subsequent object and copy properties into o
//if they don't already exist
for (; i < l; i++) {
for (var j in obj[i]) {
if (typeof o[j] === 'undefined' && obj[i].hasOwnProperty(j)) {
o[j] = obj[i][j];
}
}
}
return o;
}
/**
* Custom stringify function.
*
* @param {Object} data
* @param {String} newline (optional)
* @param {Boolean} stringify_array
* @return {String}
* @api public
*/
exports.dataToString = function (data, newline, stringify_array) {
var str = '';
newline = newline || '\n';
if (!stringify_array && data instanceof Array) {
for (var i = 0, l = data.length; i < l; i++) {
str += exports.dataToString(data[i], newline, true);
}
} else if (typeof data === 'object') {
str = JSON.stringify(data) + newline;
} else {
str = data + newline;
}
return str;
};
/**
* A method for creating and controlling a node.io daemon.
*
* `arg` can be:
* start = daemonizes the process
* stop = stops the daemon if it is running
* restart = alias for stop -> start
* pid = outputs the daemon's PID if it is running
* log = outputs the daemon's log file (stdout & stderr)
*
* @param {String} arg
* @param {Function} callback
* @api public
*/
exports.daemonize = function (arg, callback) {
var lock_file = '/tmp/nodeio.pid',
log_file = '/tmp/nodeio.log';
try {
var daemon = require('daemon');
} catch(e) {
exports.status.fatal('Please run `npm install daemon`');
}
var start = function () {
daemon.daemonize(log_file, lock_file, function (err) {
if (err) return status('Error starting daemon: ' + err, 'error');
callback();
});
};
var stop = function () {
try {
fs.readFileSync(lock_file);
} catch (e) {
return status('Daemon is not running', 'error');
};
daemon.kill(lock_file, function (err, pid) {
if (err && err.errno === 3) {
return status('Daemon is not running', 'error');
} else if (err) {
return status('Error stopping daemon: ' + err.errno, 'error');
}
status('Successfully stopped daemon with pid: ' + pid, 'ok');
});
};
switch(arg) {
case 'stop':
stop();
break;
case 'restart':
daemon.kill(lock_file, function () {
start();
});
break;
case 'log':
try {
console.log(fs.readFileSync(log_file, 'utf8'));
} catch (e) {
return status('No daemon log file', 'error');
};
break;
case 'pid':
try {
var pid = fs.readFileSync(lock_file, 'utf8');
fs.statSync('/proc/' + pid);
status(pid, 'info');
} catch (e) {
return status('Daemon is not running', 'error');
};
break;
default:
start();
break;
}
}
/**
* Recursively find all files in a directory (async).
*
* `callback` receives an array of files.
*
* @param {String} path
* @param {Function} callback
* @api public
*/
exports.getFiles = function (root_path, callback) {
var files = [];
fs.readdir(root_path, function(err, dir_files) {
if (err) throw err;
var i = dir_files.length;
var check_complete = function () {
if (i === 0) {
callback(files);
}
};
check_complete();
dir_files.forEach(function (path) {
fs.stat(root_path + '/' + path, function (err, stat) {
if (err) throw err;
if (stat.isDirectory()) {
exports.getFiles(root_path + '/' + path, function (subdir_files) {
subdir_files.forEach(function (file) {
files.push(path + '/' + file);
});
i--;
check_complete();
});
} else {
files.push(path);
i--;
check_complete();
}
});
});
});
};