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data.js
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data.js
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/*
* Library for storing and editing data
*
*/
// Dependencies
var fs = require('fs');
var path = require('path');
var helpers = require('./helpers');
// Container for module (to be exported)
var lib = {};
// Base directory of data folder
lib.baseDir = path.join(__dirname, '/../.data/');
// Write data to a file
lib.create = function(dir, file, data, callback) {
// Open the file for writing
fs.open(lib.baseDir + dir + '/' + file + '.json', 'wx', function(err, fileDescriptor) {
if (!err && fileDescriptor) {
// Convert data to string
var stringData = JSON.stringify(data);
// Write to file and close it
fs.writeFile(fileDescriptor, stringData, function(err) {
if (!err) {
fs.close(fileDescriptor, function(err) {
if (!err) {
callback(false);
} else {
callback('Error closing new file');
}
});
} else {
callback('Error writing to new file');
}
});
} else {
callback('Could not create new file, it may already exist');
}
});
};
// Read data from a file
lib.read = function(dir, file, callback) {
fs.readFile(lib.baseDir + dir + '/' + file + '.json', 'utf8', function(err, data) {
if (!err && data) {
var parsedData = helpers.parseJsonToObject(data);
callback(false, parsedData);
} else {
callback(err, data);
}
});
};
// Update data in a file
lib.update = function(dir, file, data, callback) {
// Open the file for writing
fs.open(lib.baseDir + dir + '/' + file + '.json', 'r+', function(err, fileDescriptor) {
if (!err && fileDescriptor) {
// Convert data to string
var stringData = JSON.stringify(data);
// Truncate the file
fs.ftruncate(fileDescriptor, function(err) {
if (!err) {
// Write to file and close it
fs.writeFile(fileDescriptor, stringData, function(err) {
if (!err) {
fs.close(fileDescriptor, function(err) {
if (!err) {
callback(false);
} else {
callback('Error closing existing file');
}
});
} else {
callback('Error writing to existing file');
}
});
} else {
callback('Error truncating file');
}
});
} else {
callback('Could not open file for updating, it may not exist yet');
}
});
};
// Delete a file
lib.delete = function(dir, file, callback) {
// Unlink the file from the filesystem
fs.unlink(lib.baseDir + dir + '/' + file + '.json', function(err) {
callback(err);
});
};
// List all the items in a directory
lib.list = function(dir, callback) {
fs.readdir(lib.baseDir + dir + '/', function(err, data) {
if (!err && data && data.length > 0) {
var trimmedFileNames = [];
data.forEach(function(fileName) {
trimmedFileNames.push(fileName.replace('.json', ''));
});
callback(false, trimmedFileNames);
} else {
callback(err, data);
}
});
};
// Export the module
module.exports = lib;