This set of functions provides functionality for file operations, including deletion, creation, reading, and closing, with associated error handling for potential issues such as permission problems or file non-existence. Additionally, there are methods for sending results or errors to the client, assuming that the $.sync() method has been called beforehand.
$.async();
fs.unlink('test.file')
.catch(e => console.log(e))
.then(() => fs.writeFile('test.file', 'some output'))
.then(() => fs.readFile('test.file'))
.then(r => r.toString())
.then(r => $.sendResult(r))
.then(() => fs.___close())
.catch(e => $.sendError(e));
// Import necessary modules
const fs = require('fs');
const $ = require('./async'); // Assuming $ is a function for async operations
/**
* Writes a file and returns its contents.
*
* @param {string} filePath Path to the file to write.
* @param {string} content File content.
*
* @returns {Promise} File contents.
*/
async function writeAndGetFileContent(filePath, content) {
try {
// Write to file
await fs.promises.writeFile(filePath, content);
// Read from file and return as string
const fileContent = await fs.promises.readFile(filePath, 'utf8');
return fileContent;
} catch (error) {
// Log error and rethrow
console.error('Error writing or reading file:', error);
throw error;
}
}
/**
* Main function for demonstration purposes.
*
* @returns {Promise}
*/
async function main() {
try {
// Delete file if it exists
await fs.promises.unlink('test.file');
// Write to file and get its contents
const fileContent = await writeAndGetFileContent('test.file','some output');
// Send the result
$.sendResult(fileContent);
} catch (error) {
// Send error
$.sendError(error);
} finally {
// Close the file (not needed in async/await, but added for completeness)
fs.closeSync(0); // 0 is the file descriptor for the current process's standard input
}
}
// Call the main function
main();