@push.rocks/smartstream
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A library to simplify the creation and manipulation of Node.js streams, providing utilities for handling transform, duplex, and readable/writable streams effectively in TypeScript.
145 lines • 9.38 kB
JavaScript
import * as plugins from './smartstream.plugins.js';
/**
* Creates a Web ReadableStream from a file.
*
* @param filePath - The path to the file to be read
* @returns A Web ReadableStream that reads the file in chunks
*/
export function createWebReadableStreamFromFile(filePath) {
const fileStream = plugins.fs.createReadStream(filePath);
return new ReadableStream({
start(controller) {
// When data is available, enqueue it into the Web ReadableStream
fileStream.on('data', (chunk) => {
controller.enqueue(chunk);
});
// When the file stream ends, close the Web ReadableStream
fileStream.on('end', () => {
controller.close();
});
// If there's an error, error the Web ReadableStream
fileStream.on('error', (err) => {
controller.error(err);
});
},
cancel() {
// If the Web ReadableStream is canceled, destroy the file stream
fileStream.destroy();
}
});
}
/**
* Converts a Web ReadableStream to a Node.js Readable stream.
*
* @param webStream - The Web ReadableStream to convert
* @returns A Node.js Readable stream that reads data from the Web ReadableStream
*/
export function convertWebReadableToNodeReadable(webStream) {
const reader = webStream.getReader();
return new plugins.stream.Readable({
async read() {
try {
const { value, done } = await reader.read();
if (done) {
this.push(null); // Signal end of stream
}
else {
this.push(Buffer.from(value)); // Convert Uint8Array to Buffer for Node.js Readable
}
}
catch (err) {
this.destroy(err); // Handle errors by destroying the stream
}
}
});
}
/**
* Converts a Node.js Readable stream to a Web ReadableStream.
*
* @param nodeStream - The Node.js Readable stream to convert
* @returns A Web ReadableStream that reads data from the Node.js Readable stream
*/
export function convertNodeReadableToWebReadable(nodeStream) {
return new ReadableStream({
start(controller) {
nodeStream.on('data', (chunk) => {
controller.enqueue(new Uint8Array(chunk));
});
nodeStream.on('end', () => {
controller.close();
});
nodeStream.on('error', (err) => {
controller.error(err);
});
},
cancel() {
nodeStream.destroy();
}
});
}
/**
* Converts a Web WritableStream to a Node.js Writable stream.
*
* @param webWritable - The Web WritableStream to convert
* @returns A Node.js Writable stream that writes data to the Web WritableStream
*/
export function convertWebWritableToNodeWritable(webWritable) {
const writer = webWritable.getWriter();
return new plugins.stream.Writable({
async write(chunk, encoding, callback) {
try {
await writer.write(new Uint8Array(chunk));
callback();
}
catch (err) {
callback(err);
}
},
final(callback) {
writer.close().then(() => callback()).catch(callback);
},
destroy(err, callback) {
writer.abort(err).then(() => callback(err)).catch(callback);
}
});
}
/**
* Converts a Node.js Writable stream to a Web WritableStream.
*
* @param nodeWritable - The Node.js Writable stream to convert
* @returns A Web WritableStream that writes data to the Node.js Writable stream
*/
export function convertNodeWritableToWebWritable(nodeWritable) {
return new WritableStream({
write(chunk) {
return new Promise((resolve, reject) => {
nodeWritable.write(Buffer.from(chunk), (err) => {
if (err) {
reject(err);
}
else {
resolve();
}
});
});
},
close() {
return new Promise((resolve, reject) => {
nodeWritable.end((err) => {
if (err) {
reject(err);
}
else {
resolve();
}
});
});
},
abort(reason) {
return new Promise((resolve, reject) => {
nodeWritable.destroy(reason);
});
}
});
}
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