dashy/services/save-config.js

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/**
* This file exports a function, used by the write config endpoint.
* It will make a backup of the users conf.yml file
* and then write their new config into the main conf.yml file.
* Finally, it will call a function with the status message
*/
const fsPromises = require('fs').promises;
module.exports = async (newConfig, render) => {
// Define constants for the config file
const settings = {
defaultLocation: './public/',
defaultFile: 'conf.yml',
filename: 'conf',
backupDenominator: '.backup.yml',
};
// Make the full file name and path to save the backup config file
const backupFilePath = `${settings.defaultLocation}${settings.filename}-`
+ `${Math.round(new Date() / 1000)}${settings.backupDenominator}`;
// The path where the main conf.yml should be read and saved to
const defaultFilePath = settings.defaultLocation + settings.defaultFile;
// Returns a string confirming successful job
const getSuccessMessage = () => `Successfully backed up ${settings.defaultFile} to`
+ ` ${backupFilePath}, and updated the contents of ${defaultFilePath}`;
// Encoding options for writing to conf file
const writeFileOptions = { encoding: 'utf8' };
// Prepare the response returned by the API
const getRenderMessage = (success, errorMsg) => JSON.stringify({
success,
message: !success ? errorMsg : getSuccessMessage(),
});
// Makes a backup of the existing config file
await fsPromises.copyFile(defaultFilePath, backupFilePath)
.catch((error) => {
render(getRenderMessage(false, `Unable to backup conf.yml: ${error}`));
});
// Writes the new content to the conf.yml file
await fsPromises.writeFile(defaultFilePath, newConfig.config.toString(), writeFileOptions)
.catch((error) => {
render(getRenderMessage(false, `Unable to write changes to conf.yml: ${error}`));
});
// If successful, then render hasn't yet been called- call it
await render(getRenderMessage(true));
};