import { createDeferredPromise } from "../util.mjs";import { destroyer } from "./destroy.mjs";import { isBlob } from "../blob.mjs";import { AbortError, ERR_INVALID_ARG_TYPE, ERR_INVALID_RETURN_VALUE,} from "../errors.ts";import { isDuplexNodeStream, isIterable, isNodeStream, isReadable, isReadableNodeStream, isWritable, isWritableNodeStream,} from "./utils.mjs";import * as process from "../../_process/process.ts";import _from from "./from.mjs";import eos from "./end-of-stream.mjs";import Readable from "./readable.mjs";import Writable from "./writable.mjs";
Object.setPrototypeOf(Duplex.prototype, Readable.prototype);Object.setPrototypeOf(Duplex, Readable);
{ for (const method of Object.keys(Writable.prototype)) { if (!Duplex.prototype[method]) { Duplex.prototype[method] = Writable.prototype[method]; } }}
function Duplex(options) { if (!(this instanceof Duplex)) { return new Duplex(options); }
Readable.call(this, options); Writable.call(this, options); this.allowHalfOpen = true;
if (options) { if (options.readable === false) { this.readable = false; }
if (options.writable === false) { this.writable = false; }
if (options.allowHalfOpen === false) { this.allowHalfOpen = false; } }}
Object.defineProperties(Duplex.prototype, { writable: Object.getOwnPropertyDescriptor(Writable.prototype, "writable"), writableHighWaterMark: Object.getOwnPropertyDescriptor( Writable.prototype, "writableHighWaterMark", ), writableObjectMode: Object.getOwnPropertyDescriptor( Writable.prototype, "writableObjectMode", ), writableBuffer: Object.getOwnPropertyDescriptor( Writable.prototype, "writableBuffer", ), writableLength: Object.getOwnPropertyDescriptor( Writable.prototype, "writableLength", ), writableFinished: Object.getOwnPropertyDescriptor( Writable.prototype, "writableFinished", ), writableCorked: Object.getOwnPropertyDescriptor( Writable.prototype, "writableCorked", ), writableEnded: Object.getOwnPropertyDescriptor( Writable.prototype, "writableEnded", ), writableNeedDrain: Object.getOwnPropertyDescriptor( Writable.prototype, "writableNeedDrain", ),
destroyed: { get() { if ( this._readableState === undefined || this._writableState === undefined ) { return false; } return this._readableState.destroyed && this._writableState.destroyed; }, set(value) { if (this._readableState && this._writableState) { this._readableState.destroyed = value; this._writableState.destroyed = value; } }, },});
class Duplexify extends Duplex { constructor(options) { super(options);
if (options?.readable === false) { this._readableState.readable = false; this._readableState.ended = true; this._readableState.endEmitted = true; }
if (options?.writable === false) { this._writableState.writable = false; this._writableState.ending = true; this._writableState.ended = true; this._writableState.finished = true; } }}
function duplexify(body, name) { if (isDuplexNodeStream(body)) { return body; }
if (isReadableNodeStream(body)) { return _duplexify({ readable: body }); }
if (isWritableNodeStream(body)) { return _duplexify({ writable: body }); }
if (isNodeStream(body)) { return _duplexify({ writable: false, readable: false }); }
if (typeof body === "function") { const { value, write, final, destroy } = fromAsyncGen(body);
if (isIterable(value)) { return _from(Duplexify, value, { objectMode: true, write, final, destroy, }); }
const then = value?.then; if (typeof then === "function") { let d;
const promise = then.call( value, (val) => { if (val != null) { throw new ERR_INVALID_RETURN_VALUE("nully", "body", val); } }, (err) => { destroyer(d, err); }, );
return d = new Duplexify({ objectMode: true, readable: false, write, final(cb) { final(async () => { try { await promise; process.nextTick(cb, null); } catch (err) { process.nextTick(cb, err); } }); }, destroy, }); }
throw new ERR_INVALID_RETURN_VALUE( "Iterable, AsyncIterable or AsyncFunction", name, value, ); }
if (isBlob(body)) { return duplexify(body.arrayBuffer()); }
if (isIterable(body)) { return _from(Duplexify, body, { objectMode: true, writable: false, }); }
if ( typeof body?.writable === "object" || typeof body?.readable === "object" ) { const readable = body?.readable ? isReadableNodeStream(body?.readable) ? body?.readable : duplexify(body.readable) : undefined;
const writable = body?.writable ? isWritableNodeStream(body?.writable) ? body?.writable : duplexify(body.writable) : undefined;
return _duplexify({ readable, writable }); }
const then = body?.then; if (typeof then === "function") { let d;
then.call( body, (val) => { if (val != null) { d.push(val); } d.push(null); }, (err) => { destroyer(d, err); }, );
return d = new Duplexify({ objectMode: true, writable: false, read() {}, }); }
throw new ERR_INVALID_ARG_TYPE( name, [ "Blob", "ReadableStream", "WritableStream", "Stream", "Iterable", "AsyncIterable", "Function", "{ readable, writable } pair", "Promise", ], body, );}
function fromAsyncGen(fn) { let { promise, resolve } = createDeferredPromise(); const ac = new AbortController(); const signal = ac.signal; const value = fn( async function* () { while (true) { const _promise = promise; promise = null; const { chunk, done, cb } = await _promise; process.nextTick(cb); if (done) return; if (signal.aborted) throw new AbortError(); ({ promise, resolve } = createDeferredPromise()); yield chunk; } }(), { signal }, );
return { value, write(chunk, encoding, cb) { const _resolve = resolve; resolve = null; _resolve({ chunk, done: false, cb }); }, final(cb) { const _resolve = resolve; resolve = null; _resolve({ done: true, cb }); }, destroy(err, cb) { ac.abort(); cb(err); }, };}
function _duplexify(pair) { const r = pair.readable && typeof pair.readable.read !== "function" ? Readable.wrap(pair.readable) : pair.readable; const w = pair.writable;
let readable = !!isReadable(r); let writable = !!isWritable(w);
let ondrain; let onfinish; let onreadable; let onclose; let d;
function onfinished(err) { const cb = onclose; onclose = null;
if (cb) { cb(err); } else if (err) { d.destroy(err); } else if (!readable && !writable) { d.destroy(); } }
d = new Duplexify({ readableObjectMode: !!r?.readableObjectMode, writableObjectMode: !!w?.writableObjectMode, readable, writable, });
if (writable) { eos(w, (err) => { writable = false; if (err) { destroyer(r, err); } onfinished(err); });
d._write = function (chunk, encoding, callback) { if (w.write(chunk, encoding)) { callback(); } else { ondrain = callback; } };
d._final = function (callback) { w.end(); onfinish = callback; };
w.on("drain", function () { if (ondrain) { const cb = ondrain; ondrain = null; cb(); } });
w.on("finish", function () { if (onfinish) { const cb = onfinish; onfinish = null; cb(); } }); }
if (readable) { eos(r, (err) => { readable = false; if (err) { destroyer(r, err); } onfinished(err); });
r.on("readable", function () { if (onreadable) { const cb = onreadable; onreadable = null; cb(); } });
r.on("end", function () { d.push(null); });
d._read = function () { while (true) { const buf = r.read();
if (buf === null) { onreadable = d._read; return; }
if (!d.push(buf)) { return; } } }; }
d._destroy = function (err, callback) { if (!err && onclose !== null) { err = new AbortError(); }
onreadable = null; ondrain = null; onfinish = null;
if (onclose === null) { callback(err); } else { onclose = callback; destroyer(w, err); destroyer(r, err); } };
return d;}
function duplexFrom(body) { return duplexify(body, "body");}
Duplex.from = duplexFrom;
export default Duplex;export { duplexFrom as from, duplexify };