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util.js
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util.js
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var path = require('path');
var log = require('./log').logger('util');
var fs = require('fs');
var q = require('q');
var fs = require('fs');
var uuid = require('node-uuid');
var fs = require('fs');
var escapeRE = require('escape-regexp-component');
var exec = require('child_process').exec;
var stream = require('stream');
var mime = require('mime');
var restify = require('restify');
var errors = restify.errors;
ALLOWED_EXTENSIONS = ['.nc','.g','.sbp','.gc','.gcode'];
ALLOWED_APP_EXTENSIONS = ['.zip', '.fma'];
GCODE_EXTENSIONS = ['.nc','.g','.gc','.gcode'];
OPENSBP_EXTENSIONS = ['.sbp', '.sbc'];
var MethodNotAllowedError = errors.MethodNotAllowedError;
var NotAuthorizedError = errors.NotAuthorizedError;
var ResourceNotFoundError = errors.ResourceNotFoundError;
function listify(x) {
if(x instanceof Array) {
return x;
} else {
return [x];
}
}
function doshell(command, callback){
exec(command, function(error, stdout, stderr) {
callback(stdout);
});
}
function extend(a,b, force) {
for(k in b) {
if(a.hasOwnProperty(k) || force) {
if(typeof b[k] === 'object' && b[k] !== null) {
if(typeof a[k] === 'object' && a[k] !== null) {
extend(a[k], b[k], force);
} else {
if(force) {
a[k] = b[k];
} else {
log.warn('Object format error in extend.');
}
}
} else {
a[k] = b[k];
}
}
}
}
exports.filename = function(pathname) {
parts = pathname.split(path.sep);
return parts[parts.legnth-1];
};
var createUniqueFilename = function (filename) {
var extension = (/[.]/.exec(filename)) ? /[^.]+$/.exec(filename) : undefined;
return uuid.v1() + (extension ? ('.' + extension) : '');
};
// Simple queue, faster than using array.shift
function Queue(){
var queue = [];
var offset = 0;
this.getLength = function(){ return (queue.length - offset); };
this.getContents = function() { return queue; };
this.isEmpty = function(){ return (queue.length === 0); };
this.enqueue = function(item){ queue.push(item); };
this.multiEnqueue = function(iterable) {
iterable.forEach(function(item) {
queue.push(item);
});
}
this.dequeue = function(){
// if the queue is empty, return immediately
if (queue.length === 0) return undefined;
// store the item at the front of the queue
var item = queue[offset];
// increment the offset and remove the free space if necessary
if (++ offset * 2 >= queue.length){
queue = queue.slice(offset);
offset = 0;
}
// return the dequeued item
return item;
};
this.multiDequeue = function(count) {
// If asking for more items than are in the queue, return everything
count = count > queue.length ? queue.length : count;
// store the item at the front of the queue
var items = queue.slice(offset, offset+count);
// add to the offset and remove the free space if necessary
offset += count;
if (offset * 2 >= queue.length){
queue = queue.slice(offset);
offset = 0;
}
// return the dequeued item
return items;
};
this.peek = function(){
return (queue.length > 0 ? queue[offset] : undefined);
};
this.clear = function() {
queue = [];
offset = 0;
};
}
function allowed_file(filename){
return isGCodeFile(filename) || isOpenSBPFile(filename);
}
function allowedAppFile(filename) {
if (ALLOWED_APP_EXTENSIONS.indexOf(path.extname(filename).toLowerCase()) !== -1) {
return true;
}
else {
return false;
}
}
function isGCodeFile(pathname) {
return (GCODE_EXTENSIONS.indexOf(path.extname(pathname).toLowerCase()) !== -1)
}
function isOpenSBPFile(pathname) {
return (OPENSBP_EXTENSIONS.indexOf(path.extname(pathname).toLowerCase()) !== -1)
}
/**
* Move a file from src to dest, avoiding cross-device rename failures.
* This method will first try fs.rename and call the supplied callback if it succeeds. Otherwise
* it will pump the conent of src into dest and unlink src upon completion.
*
* This might take a little more time than a single fs.rename, but it avoids error when
* trying to rename files from one device to the other.
*/
var move = function (src, dest, cb) {
var renameDeferred = q.defer();
fs.rename(src, dest, function (err) {
if (err) {
renameDeferred.reject(err);
}
else {
renameDeferred.resolve();
}
});
renameDeferred.promise.then(function () {
// rename worked
return cb(null);
}, function (err) {
log.warn('io.move: standard rename failed, trying stream pipe... (' + err + ')');
// rename didn't work, try pumping
var is = fs.createReadStream(src),
os = fs.createWriteStream(dest);
is.pipe(os);
is.on('end', function () {
fs.unlinkSync(src);
cb(null);
});
is.on('error', function (err) {
return cb(err);
});
os.on('error', function (err) {
return cb(err);
});
});
};
function serveStatic(opts) {
opts = opts || {};
/*
assert.object(opts, 'options');
assert.string(opts.directory, 'options.directory');
assert.optionalNumber(opts.maxAge, 'options.maxAge');
assert.optionalObject(opts.match, 'options.match');
assert.optionalString(opts.charSet, 'options.charSet');
*/
var p = path.normalize(opts.directory).replace(/\\/g, '/');
var re = new RegExp('^' + escapeRE(p) + '/?.*');
function serveFileFromStats(file, err, stats, isGzip, req, res, next) {
if (err) {
next(new ResourceNotFoundError(err,
req.path()));
return;
} else if (!stats.isFile()) {
next(new ResourceNotFoundError('%s does not exist', req.path()));
return;
}
if (res.handledGzip && isGzip) {
res.handledGzip();
}
var fstream = fs.createReadStream(file + (isGzip ? '.gz' : ''));
var maxAge = opts.maxAge === undefined ? 3600 : opts.maxAge;
fstream.once('open', function (fd) {
res.cache({maxAge: maxAge});
res.set('Content-Length', stats.size);
res.set('Content-Type', mime.lookup(file));
res.set('Last-Modified', stats.mtime);
if (opts.charSet) {
var type = res.getHeader('Content-Type') +
'; charset=' + opts.charSet;
res.setHeader('Content-Type', type);
}
if (opts.etag) {
res.set('ETag', opts.etag(stats, opts));
}
res.writeHead(200);
fstream.pipe(res);
fstream.once('end', function () {
next(false);
});
});
}
function serveNormal(file, req, res, next) {
fs.stat(file, function (err, stats) {
if (!err && stats.isDirectory() && opts.default) {
// Serve an index.html page or similar
file = path.join(file, opts.default);
fs.stat(file, function (dirErr, dirStats) {
serveFileFromStats(file,
dirErr,
dirStats,
false,
req,
res,
next);
});
} else {
serveFileFromStats(file,
err,
stats,
false,
req,
res,
next);
}
});
}
function serve(req, res, next) {
var uricomp = decodeURIComponent(req.path());
var file = path.join(opts.directory, uricomp);
if (req.method !== 'GET' && req.method !== 'HEAD') {
next(new MethodNotAllowedError(req.method));
return;
}
if (!re.test(file.replace(/\\/g, '/'))) {
next(new NotAuthorizedError(req.path()));
return;
}
if (opts.match && !opts.match.test(file)) {
next(new NotAuthorizedError(req.path()));
return;
}
if (opts.gzip && req.acceptsEncoding('gzip')) {
fs.stat(file + '.gz', function (err, stats) {
if (!err) {
res.setHeader('Content-Encoding', 'gzip');
serveFileFromStats(file,
err,
stats,
true,
req,
res,
next);
} else {
serveNormal(file, req, res, next);
}
});
} else {
serveNormal(file, req, res, next);
}
}
return (serve);
}
// TODO better error handling here
function walkDir(filename) {
var stats = fs.lstatSync(filename),
info = {
path: filename,
text: path.basename(filename),
name: path.basename(filename)
};
if (stats.isDirectory()) {
info.type = "dir";
info.children = fs.readdirSync(filename).map(function(child) {
return walkDir(filename + '/' + child);
});
} else {
// Assuming it's a file. In real life it could be a symlink or
// something else!
info.type = "file";
info.children = null;
}
return info;
}
function fixJSON(json) {
var retval = {};
for(var key in json) {
if (typeof json[key] === 'object') {
var value = fixJSON(json[key]);
} else {
var value = Number(json[key]);
if(typeof value === 'undefined' || isNaN(value)) {
if(json[key] === 'true') {
value = true;
} else if(json[key] === 'false') {
value = false;
} else {
value = json[key];
}
}
}
if(key[0] === '_') {
key = key.slice(1);
}
retval[key] = value;
}
return retval;
}
function Watchdog(timeout,exit_code){
var watchdog_flag;
var watchdog_timeout=timeout||1000;
var watchdog_exit_code=exit_code||20;
watchdog_exit = function(){
//throw new Error("G2 is not responding");
//process.exit(this.watchdog_exit_code);
};
this.start = function(){
if(this.watchdog_flag===undefined){
this.watchdog_flag=setTimeout(watchdog_exit,watchdog_timeout);
}
else{
this.reset();
}
};
this.stop= function(){
if(this.watchdog_flag){
clearTimeout(this.watchdog_flag);
this.watchdog_flag=undefined;
}
};
this.reset = function(){
if(this.watchdog_flag){
clearTimeout(this.watchdog_flag);
this.watchdog_flag=setTimeout(watchdog_exit,watchdog_timeout);
}
};
}
var getClientAddress = function (req) {
return (req.headers['x-forwarded-for'] || '').split(',')[0]
|| req.connection.remoteAddress;
};
var isANumber = function(n) {
try {
var n = Number(n);
return n == n;
} catch(e) {
return false;
}
}
var mm2in = function(mm) {
return mm/25.4;
}
var in2mm = function(inch) {
return inch*25.4;
}
var unitType = function(u) {
u = String(u).trim().toLowerCase()
switch(u) {
case '0':
case 'in':
return 'in';
break;
case '1':
case 'mm':
return 'mm';
break;
default:
throw new Error('Invalid unit type specifier: ' + u);
break;
}
}
function LineNumberer(options) {
// allow use without new
if (!(this instanceof LineNumberer)) {
return new LineNumberer(options);
}
this.count = 0;
// init Transform
stream.Transform.call(this, options);
}
util.inherits(LineNumberer, stream.Transform);
LineNumberer.prototype._transform = function(chunk, enc, next) {
var data = chunk.toString();
if (this._lastLineData) { data = this._lastLineData + data; }
var lines = data.split('\n');
this._lastLineData = lines.splice(lines.length-1,1)[0];
block = []
for(var i=0; i<lines.length; i++) {
this.count += 1;
//this.push("N" + this.count + " " + lines[i] + '\n');
block.push("N" + this.count + " " + lines[i]);
}
this.push(block.join('\n'))
next();
};
LineNumberer.prototype._flush = function(done) {
if (this._lastLineData) { this.push(this._lastLineData); }
this._lastLineData = null;
done();
};
var countLineNumbers = function(filename, callback) {
var i;
var lines = 0;
require('fs').createReadStream(filename)
.on('data', function(chunk) {
for (i=0; i < chunk.length; ++i)
if (chunk[i] == 10) lines++;
})
.on('end', function() {
callback(null, lines)
});
}
exports.countLineNumbers = countLineNumbers;
exports.LineNumberer = LineNumberer;
exports.serveStatic = serveStatic;
exports.Queue = Queue;
exports.Watchdog = Watchdog;
exports.allowed_file = allowed_file;
exports.allowedAppFile = allowedAppFile;
exports.move = move;
exports.walkDir = walkDir;
exports.createUniqueFilename = createUniqueFilename;
exports.fixJSON = fixJSON;
exports.extend = extend;
exports.doshell = doshell;
exports.getClientAddress = getClientAddress;
exports.isANumber = isANumber;
exports.in2mm = in2mm;
exports.mm2in = mm2in;
exports.unitType = unitType;