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// permission from the author, Mathias Buus (@mafintosh).
'use strict';
const {
ArrayIsArray,
Promise,
SymbolAsyncIterator,
} = primordials;
const eos = require('internal/streams/end-of-stream');
const { once } = require('internal/util');
const destroyImpl = require('internal/streams/destroy');
const Duplex = require('internal/streams/duplex');
const {
aggregateTwoErrors,
codes: {
ERR_INVALID_ARG_TYPE,
ERR_INVALID_RETURN_VALUE,
ERR_MISSING_ARGS,
ERR_STREAM_DESTROYED,
},
AbortError,
} = require('internal/errors');
const {
validateFunction,
validateAbortSignal
} = require('internal/validators');
const {
isIterable,
isReadable,
isReadableNodeStream,
isNodeStream,
} = require('internal/streams/utils');
const { AbortController } = require('internal/abort_controller');
let PassThrough;
let Readable;
function destroyer(stream, reading, writing) {
let finished = false;
stream.on('close', () => {
finished = true;
});
const cleanup = eos(stream, { readable: reading, writable: writing }, (err) => {
finished = !err;
});
return {
destroy: (err) => {
if (finished) return;
finished = true;
destroyImpl.destroyer(stream, err || new ERR_STREAM_DESTROYED('pipe'));
},
cleanup
};
}
function popCallback(streams) {
// Streams should never be an empty array. It should always contain at least
// a single stream. Therefore optimize for the average case instead of
// checking for length === 0 as well.
validateFunction(streams[streams.length - 1], 'streams[stream.length - 1]');
return streams.pop();
}
function makeAsyncIterable(val) {
if (isIterable(val)) {
return val;
} else if (isReadableNodeStream(val)) {
// Legacy streams are not Iterable.
return fromReadable(val);
}
throw new ERR_INVALID_ARG_TYPE(
'val', ['Readable', 'Iterable', 'AsyncIterable'], val);
}
async function* fromReadable(val) {
if (!Readable) {
Readable = require('internal/streams/readable');
}
yield* Readable.prototype[SymbolAsyncIterator].call(val);
}
async function pump(iterable, writable, finish, { end }) {
let error;
let onresolve = null;
const resume = (err) => {
if (err) {
error = err;
}
if (onresolve) {
const callback = onresolve;
onresolve = null;
callback();
}
};
const wait = () => new Promise((resolve, reject) => {
if (error) {
reject(error);
} else {
onresolve = () => {
if (error) {
reject(error);
} else {
resolve();
}
};
}
});
writable.on('drain', resume);
const cleanup = eos(writable, { readable: false }, resume);
try {
if (writable.writableNeedDrain) {
await wait();
}
for await (const chunk of iterable) {
if (!writable.write(chunk)) {
await wait();
}
}
if (end) {
writable.end();
}
await wait();
finish();
} catch (err) {
finish(error !== err ? aggregateTwoErrors(error, err) : err);
} finally {
cleanup();
writable.off('drain', resume);
}
}
function pipeline(...streams) {
return pipelineImpl(streams, once(popCallback(streams)));
}
function pipelineImpl(streams, callback, opts) {
if (streams.length === 1 && ArrayIsArray(streams[0])) {
streams = streams[0];
}
if (streams.length < 2) {
throw new ERR_MISSING_ARGS('streams');
}
const ac = new AbortController();
const signal = ac.signal;
const outerSignal = opts?.signal;
// Need to cleanup event listeners if last stream is readable
// https://github.com/nodejs/node/issues/35452
const lastStreamCleanup = [];
validateAbortSignal(outerSignal, 'options.signal');
function abort() {
finishImpl(new AbortError());
}
outerSignal?.addEventListener('abort', abort);
let error;
let value;
const destroys = [];
let finishCount = 0;
function finish(err) {
finishImpl(err, --finishCount === 0);
}
function finishImpl(err, final) {
if (err && (!error || error.code === 'ERR_STREAM_PREMATURE_CLOSE')) {
error = err;
}
if (!error && !final) {
return;
}
while (destroys.length) {
destroys.shift()(error);
}
outerSignal?.removeEventListener('abort', abort);
ac.abort();
if (final) {
if (!error) {
lastStreamCleanup.forEach((fn) => fn());
}
process.nextTick(callback, error, value);
}
}
let ret;
for (let i = 0; i < streams.length; i++) {
const stream = streams[i];
const reading = i < streams.length - 1;
const writing = i > 0;
const end = reading || opts?.end !== false;
const isLastStream = i === streams.length - 1;
if (isNodeStream(stream)) {
if (end) {
const { destroy, cleanup } = destroyer(stream, reading, writing);
destroys.push(destroy);
if (isReadable(stream) && isLastStream) {
lastStreamCleanup.push(cleanup);
}
}
// Catch stream errors that occur after pipe/pump has completed.
function onError(err) {
if (
err &&
err.name !== 'AbortError' &&
err.code !== 'ERR_STREAM_PREMATURE_CLOSE'
) {
finish(err);
}
}
stream.on('error', onError);
if (isReadable(stream) && isLastStream) {
lastStreamCleanup.push(() => {
stream.removeListener('error', onError);
});
}
}
if (i === 0) {
if (typeof stream === 'function') {
ret = stream({ signal });
if (!isIterable(ret)) {
throw new ERR_INVALID_RETURN_VALUE(
'Iterable, AsyncIterable or Stream', 'source', ret);
}
} else if (isIterable(stream) || isReadableNodeStream(stream)) {
ret = stream;
} else {
ret = Duplex.from(stream);
}
} else if (typeof stream === 'function') {
ret = makeAsyncIterable(ret);
ret = stream(ret, { signal });
if (reading) {
if (!isIterable(ret, true)) {
throw new ERR_INVALID_RETURN_VALUE(
'AsyncIterable', `transform[${i - 1}]`, ret);
}
} else {
if (!PassThrough) {
PassThrough = require('internal/streams/passthrough');
}
// If the last argument to pipeline is not a stream
// we must create a proxy stream so that pipeline(...)
// always returns a stream which can be further
// composed through `.pipe(stream)`.
const pt = new PassThrough({
objectMode: true
});
// Handle Promises/A+ spec, `then` could be a getter that throws on
// second use.
const then = ret?.then;
if (typeof then === 'function') {
finishCount++;
then.call(ret,
(val) => {
value = val;
if (val != null) {
pt.write(val);
}
if (end) {
pt.end();
}
process.nextTick(finish);
}, (err) => {
pt.destroy(err);
process.nextTick(finish, err);
},
);
} else if (isIterable(ret, true)) {
finishCount++;
pump(ret, pt, finish, { end });
} else {
throw new ERR_INVALID_RETURN_VALUE(
'AsyncIterable or Promise', 'destination', ret);
}
ret = pt;
const { destroy, cleanup } = destroyer(ret, false, true);
destroys.push(destroy);
if (isLastStream) {
lastStreamCleanup.push(cleanup);
}
}
} else if (isNodeStream(stream)) {
if (isReadableNodeStream(ret)) {
finishCount += 2;
const cleanup = pipe(ret, stream, finish, { end });
if (isReadable(stream) && isLastStream) {
lastStreamCleanup.push(cleanup);
}
} else if (isIterable(ret)) {
finishCount++;
pump(ret, stream, finish, { end });
} else {
throw new ERR_INVALID_ARG_TYPE(
'val', ['Readable', 'Iterable', 'AsyncIterable'], ret);
}
ret = stream;
} else {
ret = Duplex.from(stream);
}
}
if (signal?.aborted || outerSignal?.aborted) {
process.nextTick(abort);
}
return ret;
}
function pipe(src, dst, finish, { end }) {
src.pipe(dst, { end });
if (end) {
// Compat. Before node v10.12.0 stdio used to throw an error so
// pipe() did/does not end() stdio destinations.
// Now they allow it but "secretly" don't close the underlying fd.
src.once('end', () => dst.end());
} else {
finish();
}
eos(src, { readable: true, writable: false }, (err) => {
const rState = src._readableState;
if (
err &&
err.code === 'ERR_STREAM_PREMATURE_CLOSE' &&
(rState && rState.ended && !rState.errored && !rState.errorEmitted)
) {
// Some readable streams will emit 'close' before 'end'. However, since
// this is on the readable side 'end' should still be emitted if the
// stream has been ended and no error emitted. This should be allowed in
// favor of backwards compatibility. Since the stream is piped to a
// destination this should not result in any observable difference.
// We don't need to check if this is a writable premature close since
// eos will only fail with premature close on the reading side for
// duplex streams.
src
.once('end', finish)
.once('error', finish);
} else {
finish(err);
}
});
return eos(dst, { readable: false, writable: true }, finish);
}
module.exports = { pipelineImpl, pipeline };
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