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data.js
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data.js
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const path = require('path');
const fs = require('fs');
const helpers = require('./helpers');
const lib = {};
lib.baseDir = path.join(__dirname, '../.data/');
lib.create = (dir, file, data, callback) => {
fs.open(`${lib.baseDir}${dir}/${file}.json`, 'wx', (err, fileDescriptor) => {
if (!err && fileDescriptor) {
const stringData = JSON.stringify(data);
fs.writeFile(fileDescriptor, stringData, (err) => {
if (!err) {
fs.close(fileDescriptor, (err) => {
if (!err) {
callback(false);
} else {
callback('Error closing new file');
}
});
} else {
callback('Error writing to new file');
}
});
} else {
callback('Could not create new file, it may already exist');
}
});
};
lib.read = (dir, file, callback) => {
fs.readFile(`${lib.baseDir}${dir}/${file}.json`, 'utf-8', (err, data) => {
if (!err && data) {
const parsedData = helpers.parseJsonToObject(data);
callback(false, parsedData);
} else {
callback(err, data);
}
})
};
lib.update = (dir, file, data, callback) => {
fs.open(`${lib.baseDir}${dir}/${file}.json`, 'r+', (err, fileDescriptor) => {
if (!err && fileDescriptor) {
const stringData = JSON.stringify(data);
// Truncate the file
fs.ftruncate(fileDescriptor, (err) => {
if (!err) {
fs.writeFile(fileDescriptor, stringData, (err) => {
if (!err) {
fs.close(fileDescriptor, (err) => {
if (!err) {
callback(false);
} else {
callback('Error closing existing file');
}
});
} else {
callback('Error writing to existing file');
}
});
} else {
callback('Error truncating file');
}
})
} else {
callback('Could not open the file for updating, it may not exist yet');
}
});
};
lib.delete = (dir, file, callback) => {
// Unlink the file
fs.unlink(`${lib.baseDir}${dir}/${file}.json`, (err) => {
if (!err) {
callback(false);
} else {
callback('Error deleting file');
}
});
}
module.exports = lib;