/
uploader.js
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/
uploader.js
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var fs = require('fs');
var path = require('path');
var async = require('async');
var limit = 10; // limit processes per path
var period = 600; // seconds between checks
var pgConfig = require('./postgres-config.js');
var imagerConfig = require('./imager-config.js');
var preset = '';
var targets = [];
var basePaths = [];
var watchedPaths = [];
var uploadingFiles = [];
// function to display usage help
var printUsage = function printUsage() {
console.log(
"\n Usage:\n" +
"\n node uploader [options] <path(s)>\n" +
"\n -h, --help Display usage help (this screen)" +
"\n -l, --limit <limit> Limit number of processes per path" +
"\n -p, --preset <preset> Specify a defined preset to run" +
"\n -t, --target <target> Specify a defined target storage" +
"\n -s, --source <source> Specify a starting source path" +
"\n"
);
};
// parse command line arguments
for (var i = 2; i < process.argv.length; i++) {
switch (process.argv[i]) {
case '-h':
case '--help':
printUsage();
process.exit(0);
break;
case '-l':
case '--limit':
limit = parseInt(process.argv[++i], 10) || limit;
break;
case '-p':
case '--preset':
preset = process.argv[++i];
break;
case '-t':
case '--target':
targets.push(process.argv[++i]);
break;
case '-s':
case '--source':
basePaths.push(process.argv[++i]);
break;
default: // default to adding path
basePaths.push(process.argv[i]);
break;
}
}
try {
if (!preset) throw new Error("Preset is required.");
if (!targets.length) throw new Error("Target is required.");
if (!basePaths.length) throw new Error("Starting path is required.");
} catch (err) {
console.log("\n" + err);
printUsage();
process.exit(1);
}
var pg = require('pg');
var Imager = require('imager');
var imager = new Imager(imagerConfig, targets);
// function to upload files to storage
var uploader = function uploader(filePath, callback) {
filePath = path.resolve(filePath);
if (uploadingFiles.indexOf(filePath) !== -1) return;
console.log('Processing file ' + filePath);
var fileName = path.basename(filePath);
var productId = parseInt(fileName.split('.').shift(),10);
if (!productId || !fileName || isNaN(productId)) return callback('File name is invalid.');
uploadingFiles.push(filePath);
imager.upload(filePath, function (err, uri, files) {
if (err) return callback(err);
if (preset === 'products') {
// update database with file names
pg.connect(pgConfig, function (err, client, done) {
client.query({
name: "imager_picture_update",
text: "UPDATE t_product SET picture = $1, thumbnail = $1, small = $1 WHERE productid = $2",
values: [fileName, productId]
}, function (err, results) {
done();
if (err) {
callback(err);
} else fs.unlink(filePath, function (err) {
uploadingFiles.splice(uploadingFiles.indexOf(filePath), 1);
callback(err);
});
});
});
} else fs.unlink(filePath, function (err) {
uploadingFiles.splice(uploadingFiles.indexOf(filePath), 1);
callback(err);
});
}, preset);
};
// function to start monitoring directories
var watcher = function watcher(watchPath) {
if (watchedPaths.indexOf(watchPath) !== -1) return;
console.log('Watching path ' + watchPath);
watchedPaths.push(watchPath);
fs.watch(watchPath, function process(event, file) {
if (file) fs.stat(path.join(watchPath, file), function (err, stat) {
if (err || !stat || stat.isDirectory()) return;
if (event !== 'change' || !stat.size) return; // ignore event
if (uploadingFiles.length > limit) { // defer if over limit
return setTimeout(process.bind(this, event, file), 1000);
}
uploader(path.join(watchPath, file), function (err) {
if (err) console.error(err);
});
});
});
};
// function to traverse directory trees and find files
var explorer = function explorer(files, dir, callback) {
if (arguments.length === 2) {
callback = dir;
dir = undefined;
}
if (!Array.isArray(files)) files = [files];
async.eachLimit(files, limit, function (file, next) {
// console.log(dir);
// console.log(file);
var filePath = path.join(dir || '', file);
var fileStat = fs.statSync(filePath);
if (fileStat && fileStat.isDirectory()) {
watcher(filePath);
explorer(fs.readdirSync(filePath), filePath, next);
} else if (fileStat && fileStat.isFile()) {
uploader(filePath, next);
} else {
next('Invalid file or directory: ' + filePath);
}
}, callback);
};
// main loop periodically scans base paths
explorer(basePaths, function finish(err) {
if (err) console.error(err);
setTimeout(explorer.bind(this, basePaths, finish), period * 1000);
});