Press n or j to go to the next uncovered block, b, p or k for the previous block.
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3342x 3342x 3342x 3339x 3339x 3342x 36x 36x 322x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 36x 3x 3x 3x 3x 3x 3x 3x 3x 36x | // Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const {
ArrayPrototypeIndexOf,
NumberIsInteger,
NumberIsNaN,
NumberParseInt,
ObjectDefineProperties,
ObjectKeys,
ObjectSetPrototypeOf,
Promise,
SafeSet,
SymbolAsyncIterator,
Symbol
} = primordials;
module.exports = Readable;
Readable.ReadableState = ReadableState;
const EE = require('events');
const { Stream, prependListener } = require('internal/streams/legacy');
const { Buffer } = require('buffer');
const {
addAbortSignal,
} = require('internal/streams/add-abort-signal');
const eos = require('internal/streams/end-of-stream');
let debug = require('internal/util/debuglog').debuglog('stream', (fn) => {
debug = fn;
});
const BufferList = require('internal/streams/buffer_list');
const destroyImpl = require('internal/streams/destroy');
const {
getHighWaterMark,
getDefaultHighWaterMark
} = require('internal/streams/state');
const {
aggregateTwoErrors,
codes: {
ERR_INVALID_ARG_TYPE,
ERR_METHOD_NOT_IMPLEMENTED,
ERR_OUT_OF_RANGE,
ERR_STREAM_PUSH_AFTER_EOF,
ERR_STREAM_UNSHIFT_AFTER_END_EVENT,
}
} = require('internal/errors');
const { validateObject } = require('internal/validators');
const kPaused = Symbol('kPaused');
const { StringDecoder } = require('string_decoder');
const from = require('internal/streams/from');
ObjectSetPrototypeOf(Readable.prototype, Stream.prototype);
ObjectSetPrototypeOf(Readable, Stream);
const nop = () => {};
const { errorOrDestroy } = destroyImpl;
function ReadableState(options, stream, isDuplex) {
// Duplex streams are both readable and writable, but share
// the same options object.
// However, some cases require setting options to different
// values for the readable and the writable sides of the duplex stream.
// These options can be provided separately as readableXXX and writableXXX.
if (typeof isDuplex !== 'boolean')
isDuplex = stream instanceof Stream.Duplex;
// Object stream flag. Used to make read(n) ignore n and to
// make all the buffer merging and length checks go away.
this.objectMode = !!(options && options.objectMode);
if (isDuplex)
this.objectMode = this.objectMode ||
!!(options && options.readableObjectMode);
// The point at which it stops calling _read() to fill the buffer
// Note: 0 is a valid value, means "don't call _read preemptively ever"
this.highWaterMark = options ?
getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex) :
getDefaultHighWaterMark(false);
// A linked list is used to store data chunks instead of an array because the
// linked list can remove elements from the beginning faster than
// array.shift().
this.buffer = new BufferList();
this.length = 0;
this.pipes = [];
this.flowing = null;
this.ended = false;
this.endEmitted = false;
this.reading = false;
// Stream is still being constructed and cannot be
// destroyed until construction finished or failed.
// Async construction is opt in, therefore we start as
// constructed.
this.constructed = true;
// A flag to be able to tell if the event 'readable'/'data' is emitted
// immediately, or on a later tick. We set this to true at first, because
// any actions that shouldn't happen until "later" should generally also
// not happen before the first read call.
this.sync = true;
// Whenever we return null, then we set a flag to say
// that we're awaiting a 'readable' event emission.
this.needReadable = false;
this.emittedReadable = false;
this.readableListening = false;
this.resumeScheduled = false;
this[kPaused] = null;
// True if the error was already emitted and should not be thrown again.
this.errorEmitted = false;
// Should close be emitted on destroy. Defaults to true.
this.emitClose = !options || options.emitClose !== false;
// Should .destroy() be called after 'end' (and potentially 'finish').
this.autoDestroy = !options || options.autoDestroy !== false;
// Has it been destroyed.
this.destroyed = false;
// Indicates whether the stream has errored. When true no further
// _read calls, 'data' or 'readable' events should occur. This is needed
// since when autoDestroy is disabled we need a way to tell whether the
// stream has failed.
this.errored = null;
// Indicates whether the stream has finished destroying.
this.closed = false;
// True if close has been emitted or would have been emitted
// depending on emitClose.
this.closeEmitted = false;
// Crypto is kind of old and crusty. Historically, its default string
// encoding is 'binary' so we have to make this configurable.
// Everything else in the universe uses 'utf8', though.
this.defaultEncoding = (options && options.defaultEncoding) || 'utf8';
// Ref the piped dest which we need a drain event on it
// type: null | Writable | Set<Writable>.
this.awaitDrainWriters = null;
this.multiAwaitDrain = false;
// If true, a maybeReadMore has been scheduled.
this.readingMore = false;
this.dataEmitted = false;
this.decoder = null;
this.encoding = null;
if (options && options.encoding) {
this.decoder = new StringDecoder(options.encoding);
this.encoding = options.encoding;
}
}
function Readable(options) {
if (!(this instanceof Readable))
return new Readable(options);
// Checking for a Stream.Duplex instance is faster here instead of inside
// the ReadableState constructor, at least with V8 6.5.
const isDuplex = this instanceof Stream.Duplex;
this._readableState = new ReadableState(options, this, isDuplex);
if (options) {
if (typeof options.read === 'function')
this._read = options.read;
if (typeof options.destroy === 'function')
this._destroy = options.destroy;
if (typeof options.construct === 'function')
this._construct = options.construct;
if (options.signal && !isDuplex)
addAbortSignal(options.signal, this);
}
Stream.call(this, options);
destroyImpl.construct(this, () => {
if (this._readableState.needReadable) {
maybeReadMore(this, this._readableState);
}
});
}
Readable.prototype.destroy = destroyImpl.destroy;
Readable.prototype._undestroy = destroyImpl.undestroy;
Readable.prototype._destroy = function(err, cb) {
cb(err);
};
Readable.prototype[EE.captureRejectionSymbol] = function(err) {
this.destroy(err);
};
// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function(chunk, encoding) {
return readableAddChunk(this, chunk, encoding, false);
};
// Unshift should *always* be something directly out of read().
Readable.prototype.unshift = function(chunk, encoding) {
return readableAddChunk(this, chunk, encoding, true);
};
function readableAddChunk(stream, chunk, encoding, addToFront) {
debug('readableAddChunk', chunk);
const state = stream._readableState;
let err;
if (!state.objectMode) {
if (typeof chunk === 'string') {
encoding = encoding || state.defaultEncoding;
if (state.encoding !== encoding) {
if (addToFront && state.encoding) {
// When unshifting, if state.encoding is set, we have to save
// the string in the BufferList with the state encoding.
chunk = Buffer.from(chunk, encoding).toString(state.encoding);
} else {
chunk = Buffer.from(chunk, encoding);
encoding = '';
}
}
} else if (chunk instanceof Buffer) {
encoding = '';
} else if (Stream._isUint8Array(chunk)) {
chunk = Stream._uint8ArrayToBuffer(chunk);
encoding = '';
} else if (chunk != null) {
err = new ERR_INVALID_ARG_TYPE(
'chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
}
}
if (err) {
errorOrDestroy(stream, err);
} else if (chunk === null) {
state.reading = false;
onEofChunk(stream, state);
} else if (state.objectMode || (chunk && chunk.length > 0)) {
if (addToFront) {
if (state.endEmitted)
errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());
else if (state.destroyed || state.errored)
return false;
else
addChunk(stream, state, chunk, true);
} else if (state.ended) {
errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
} else if (state.destroyed || state.errored) {
return false;
} else {
state.reading = false;
if (state.decoder && !encoding) {
chunk = state.decoder.write(chunk);
if (state.objectMode || chunk.length !== 0)
addChunk(stream, state, chunk, false);
else
maybeReadMore(stream, state);
} else {
addChunk(stream, state, chunk, false);
}
}
} else if (!addToFront) {
state.reading = false;
maybeReadMore(stream, state);
}
// We can push more data if we are below the highWaterMark.
// Also, if we have no data yet, we can stand some more bytes.
// This is to work around cases where hwm=0, such as the repl.
return !state.ended &&
(state.length < state.highWaterMark || state.length === 0);
}
function addChunk(stream, state, chunk, addToFront) {
if (state.flowing && state.length === 0 && !state.sync &&
stream.listenerCount('data') > 0) {
// Use the guard to avoid creating `Set()` repeatedly
// when we have multiple pipes.
if (state.multiAwaitDrain) {
state.awaitDrainWriters.clear();
} else {
state.awaitDrainWriters = null;
}
state.dataEmitted = true;
stream.emit('data', chunk);
} else {
// Update the buffer info.
state.length += state.objectMode ? 1 : chunk.length;
if (addToFront)
state.buffer.unshift(chunk);
else
state.buffer.push(chunk);
if (state.needReadable)
emitReadable(stream);
}
maybeReadMore(stream, state);
}
Readable.prototype.isPaused = function() {
const state = this._readableState;
return state[kPaused] === true || state.flowing === false;
};
// Backwards compatibility.
Readable.prototype.setEncoding = function(enc) {
const decoder = new StringDecoder(enc);
this._readableState.decoder = decoder;
// If setEncoding(null), decoder.encoding equals utf8.
this._readableState.encoding = this._readableState.decoder.encoding;
const buffer = this._readableState.buffer;
// Iterate over current buffer to convert already stored Buffers:
let content = '';
for (const data of buffer) {
content += decoder.write(data);
}
buffer.clear();
if (content !== '')
buffer.push(content);
this._readableState.length = content.length;
return this;
};
// Don't raise the hwm > 1GB.
const MAX_HWM = 0x40000000;
function computeNewHighWaterMark(n) {
if (n > MAX_HWM) {
throw new ERR_OUT_OF_RANGE('size', '<= 1GiB', n);
} else {
// Get the next highest power of 2 to prevent increasing hwm excessively in
// tiny amounts.
n--;
n |= n >>> 1;
n |= n >>> 2;
n |= n >>> 4;
n |= n >>> 8;
n |= n >>> 16;
n++;
}
return n;
}
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
if (n <= 0 || (state.length === 0 && state.ended))
return 0;
if (state.objectMode)
return 1;
if (NumberIsNaN(n)) {
// Only flow one buffer at a time.
if (state.flowing && state.length)
return state.buffer.first().length;
return state.length;
}
if (n <= state.length)
return n;
return state.ended ? state.length : 0;
}
// You can override either this method, or the async _read(n) below.
Readable.prototype.read = function(n) {
debug('read', n);
// Same as parseInt(undefined, 10), however V8 7.3 performance regressed
// in this scenario, so we are doing it manually.
if (n === undefined) {
n = NaN;
} else if (!NumberIsInteger(n)) {
n = NumberParseInt(n, 10);
}
const state = this._readableState;
const nOrig = n;
// If we're asking for more than the current hwm, then raise the hwm.
if (n > state.highWaterMark)
state.highWaterMark = computeNewHighWaterMark(n);
if (n !== 0)
state.emittedReadable = false;
// If we're doing read(0) to trigger a readable event, but we
// already have a bunch of data in the buffer, then just trigger
// the 'readable' event and move on.
if (n === 0 &&
state.needReadable &&
((state.highWaterMark !== 0 ?
state.length >= state.highWaterMark :
state.length > 0) ||
state.ended)) {
debug('read: emitReadable', state.length, state.ended);
if (state.length === 0 && state.ended)
endReadable(this);
else
emitReadable(this);
return null;
}
n = howMuchToRead(n, state);
// If we've ended, and we're now clear, then finish it up.
if (n === 0 && state.ended) {
if (state.length === 0)
endReadable(this);
return null;
}
// All the actual chunk generation logic needs to be
// *below* the call to _read. The reason is that in certain
// synthetic stream cases, such as passthrough streams, _read
// may be a completely synchronous operation which may change
// the state of the read buffer, providing enough data when
// before there was *not* enough.
//
// So, the steps are:
// 1. Figure out what the state of things will be after we do
// a read from the buffer.
//
// 2. If that resulting state will trigger a _read, then call _read.
// Note that this may be asynchronous, or synchronous. Yes, it is
// deeply ugly to write APIs this way, but that still doesn't mean
// that the Readable class should behave improperly, as streams are
// designed to be sync/async agnostic.
// Take note if the _read call is sync or async (ie, if the read call
// has returned yet), so that we know whether or not it's safe to emit
// 'readable' etc.
//
// 3. Actually pull the requested chunks out of the buffer and return.
// if we need a readable event, then we need to do some reading.
let doRead = state.needReadable;
debug('need readable', doRead);
// If we currently have less than the highWaterMark, then also read some.
if (state.length === 0 || state.length - n < state.highWaterMark) {
doRead = true;
debug('length less than watermark', doRead);
}
// However, if we've ended, then there's no point, if we're already
// reading, then it's unnecessary, if we're constructing we have to wait,
// and if we're destroyed or errored, then it's not allowed,
if (state.ended || state.reading || state.destroyed || state.errored ||
!state.constructed) {
doRead = false;
debug('reading, ended or constructing', doRead);
} else if (doRead) {
debug('do read');
state.reading = true;
state.sync = true;
// If the length is currently zero, then we *need* a readable event.
if (state.length === 0)
state.needReadable = true;
// Call internal read method
try {
const result = this._read(state.highWaterMark);
if (result != null) {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
nop,
function(err) {
errorOrDestroy(this, err);
});
}
}
} catch (err) {
errorOrDestroy(this, err);
}
state.sync = false;
// If _read pushed data synchronously, then `reading` will be false,
// and we need to re-evaluate how much data we can return to the user.
if (!state.reading)
n = howMuchToRead(nOrig, state);
}
let ret;
if (n > 0)
ret = fromList(n, state);
else
ret = null;
if (ret === null) {
state.needReadable = state.length <= state.highWaterMark;
n = 0;
} else {
state.length -= n;
if (state.multiAwaitDrain) {
state.awaitDrainWriters.clear();
} else {
state.awaitDrainWriters = null;
}
}
if (state.length === 0) {
// If we have nothing in the buffer, then we want to know
// as soon as we *do* get something into the buffer.
if (!state.ended)
state.needReadable = true;
// If we tried to read() past the EOF, then emit end on the next tick.
if (nOrig !== n && state.ended)
endReadable(this);
}
if (ret !== null && !state.errorEmitted && !state.closeEmitted) {
state.dataEmitted = true;
this.emit('data', ret);
}
return ret;
};
function onEofChunk(stream, state) {
debug('onEofChunk');
if (state.ended) return;
if (state.decoder) {
const chunk = state.decoder.end();
if (chunk && chunk.length) {
state.buffer.push(chunk);
state.length += state.objectMode ? 1 : chunk.length;
}
}
state.ended = true;
if (state.sync) {
// If we are sync, wait until next tick to emit the data.
// Otherwise we risk emitting data in the flow()
// the readable code triggers during a read() call.
emitReadable(stream);
} else {
// Emit 'readable' now to make sure it gets picked up.
state.needReadable = false;
state.emittedReadable = true;
// We have to emit readable now that we are EOF. Modules
// in the ecosystem (e.g. dicer) rely on this event being sync.
emitReadable_(stream);
}
}
// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow. This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
const state = stream._readableState;
debug('emitReadable', state.needReadable, state.emittedReadable);
state.needReadable = false;
if (!state.emittedReadable) {
debug('emitReadable', state.flowing);
state.emittedReadable = true;
process.nextTick(emitReadable_, stream);
}
}
function emitReadable_(stream) {
const state = stream._readableState;
debug('emitReadable_', state.destroyed, state.length, state.ended);
if (!state.destroyed && !state.errored && (state.length || state.ended)) {
stream.emit('readable');
state.emittedReadable = false;
}
// The stream needs another readable event if:
// 1. It is not flowing, as the flow mechanism will take
// care of it.
// 2. It is not ended.
// 3. It is below the highWaterMark, so we can schedule
// another readable later.
state.needReadable =
!state.flowing &&
!state.ended &&
state.length <= state.highWaterMark;
flow(stream);
}
// At this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data. that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
if (!state.readingMore && state.constructed) {
state.readingMore = true;
process.nextTick(maybeReadMore_, stream, state);
}
}
function maybeReadMore_(stream, state) {
// Attempt to read more data if we should.
//
// The conditions for reading more data are (one of):
// - Not enough data buffered (state.length < state.highWaterMark). The loop
// is responsible for filling the buffer with enough data if such data
// is available. If highWaterMark is 0 and we are not in the flowing mode
// we should _not_ attempt to buffer any extra data. We'll get more data
// when the stream consumer calls read() instead.
// - No data in the buffer, and the stream is in flowing mode. In this mode
// the loop below is responsible for ensuring read() is called. Failing to
// call read here would abort the flow and there's no other mechanism for
// continuing the flow if the stream consumer has just subscribed to the
// 'data' event.
//
// In addition to the above conditions to keep reading data, the following
// conditions prevent the data from being read:
// - The stream has ended (state.ended).
// - There is already a pending 'read' operation (state.reading). This is a
// case where the stream has called the implementation defined _read()
// method, but they are processing the call asynchronously and have _not_
// called push() with new data. In this case we skip performing more
// read()s. The execution ends in this method again after the _read() ends
// up calling push() with more data.
while (!state.reading && !state.ended &&
(state.length < state.highWaterMark ||
(state.flowing && state.length === 0))) {
const len = state.length;
debug('maybeReadMore read 0');
stream.read(0);
if (len === state.length)
// Didn't get any data, stop spinning.
break;
}
state.readingMore = false;
}
// Abstract method. to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function(n) {
throw new ERR_METHOD_NOT_IMPLEMENTED('_read()');
};
Readable.prototype.pipe = function(dest, pipeOpts) {
const src = this;
const state = this._readableState;
if (state.pipes.length === 1) {
if (!state.multiAwaitDrain) {
state.multiAwaitDrain = true;
state.awaitDrainWriters = new SafeSet(
state.awaitDrainWriters ? [state.awaitDrainWriters] : []
);
}
}
state.pipes.push(dest);
debug('pipe count=%d opts=%j', state.pipes.length, pipeOpts);
const doEnd = (!pipeOpts || pipeOpts.end !== false) &&
dest !== process.stdout &&
dest !== process.stderr;
const endFn = doEnd ? onend : unpipe;
if (state.endEmitted)
process.nextTick(endFn);
else
src.once('end', endFn);
dest.on('unpipe', onunpipe);
function onunpipe(readable, unpipeInfo) {
debug('onunpipe');
if (readable === src) {
if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
unpipeInfo.hasUnpiped = true;
cleanup();
}
}
}
function onend() {
debug('onend');
dest.end();
}
let ondrain;
let cleanedUp = false;
function cleanup() {
debug('cleanup');
// Cleanup event handlers once the pipe is broken.
dest.removeListener('close', onclose);
dest.removeListener('finish', onfinish);
if (ondrain) {
dest.removeListener('drain', ondrain);
}
dest.removeListener('error', onerror);
dest.removeListener('unpipe', onunpipe);
src.removeListener('end', onend);
src.removeListener('end', unpipe);
src.removeListener('data', ondata);
cleanedUp = true;
// If the reader is waiting for a drain event from this
// specific writer, then it would cause it to never start
// flowing again.
// So, if this is awaiting a drain, then we just call it now.
// If we don't know, then assume that we are waiting for one.
if (ondrain && state.awaitDrainWriters &&
(!dest._writableState || dest._writableState.needDrain))
ondrain();
}
function pause() {
// If the user unpiped during `dest.write()`, it is possible
// to get stuck in a permanently paused state if that write
// also returned false.
// => Check whether `dest` is still a piping destination.
if (!cleanedUp) {
if (state.pipes.length === 1 && state.pipes[0] === dest) {
debug('false write response, pause', 0);
state.awaitDrainWriters = dest;
state.multiAwaitDrain = false;
} else if (state.pipes.length > 1 && state.pipes.includes(dest)) {
debug('false write response, pause', state.awaitDrainWriters.size);
state.awaitDrainWriters.add(dest);
}
src.pause();
}
if (!ondrain) {
// When the dest drains, it reduces the awaitDrain counter
// on the source. This would be more elegant with a .once()
// handler in flow(), but adding and removing repeatedly is
// too slow.
ondrain = pipeOnDrain(src, dest);
dest.on('drain', ondrain);
}
}
src.on('data', ondata);
function ondata(chunk) {
debug('ondata');
const ret = dest.write(chunk);
debug('dest.write', ret);
if (ret === false) {
pause();
}
}
// If the dest has an error, then stop piping into it.
// However, don't suppress the throwing behavior for this.
function onerror(er) {
debug('onerror', er);
unpipe();
dest.removeListener('error', onerror);
if (EE.listenerCount(dest, 'error') === 0) {
const s = dest._writableState || dest._readableState;
if (s && !s.errorEmitted) {
// User incorrectly emitted 'error' directly on the stream.
errorOrDestroy(dest, er);
} else {
dest.emit('error', er);
}
}
}
// Make sure our error handler is attached before userland ones.
prependListener(dest, 'error', onerror);
// Both close and finish should trigger unpipe, but only once.
function onclose() {
dest.removeListener('finish', onfinish);
unpipe();
}
dest.once('close', onclose);
function onfinish() {
debug('onfinish');
dest.removeListener('close', onclose);
unpipe();
}
dest.once('finish', onfinish);
function unpipe() {
debug('unpipe');
src.unpipe(dest);
}
// Tell the dest that it's being piped to.
dest.emit('pipe', src);
// Start the flow if it hasn't been started already.
if (dest.writableNeedDrain === true) {
if (state.flowing) {
pause();
}
} else if (!state.flowing) {
debug('pipe resume');
src.resume();
}
return dest;
};
function pipeOnDrain(src, dest) {
return function pipeOnDrainFunctionResult() {
const state = src._readableState;
// `ondrain` will call directly,
// `this` maybe not a reference to dest,
// so we use the real dest here.
if (state.awaitDrainWriters === dest) {
debug('pipeOnDrain', 1);
state.awaitDrainWriters = null;
} else if (state.multiAwaitDrain) {
debug('pipeOnDrain', state.awaitDrainWriters.size);
state.awaitDrainWriters.delete(dest);
}
if ((!state.awaitDrainWriters || state.awaitDrainWriters.size === 0) &&
EE.listenerCount(src, 'data')) {
state.flowing = true;
flow(src);
}
};
}
Readable.prototype.unpipe = function(dest) {
const state = this._readableState;
const unpipeInfo = { hasUnpiped: false };
// If we're not piping anywhere, then do nothing.
if (state.pipes.length === 0)
return this;
if (!dest) {
// remove all.
const dests = state.pipes;
state.pipes = [];
this.pause();
for (let i = 0; i < dests.length; i++)
dests[i].emit('unpipe', this, { hasUnpiped: false });
return this;
}
// Try to find the right one.
const index = ArrayPrototypeIndexOf(state.pipes, dest);
if (index === -1)
return this;
state.pipes.splice(index, 1);
if (state.pipes.length === 0)
this.pause();
dest.emit('unpipe', this, unpipeInfo);
return this;
};
// Set up data events if they are asked for
// Ensure readable listeners eventually get something.
Readable.prototype.on = function(ev, fn) {
const res = Stream.prototype.on.call(this, ev, fn);
const state = this._readableState;
if (ev === 'data') {
// Update readableListening so that resume() may be a no-op
// a few lines down. This is needed to support once('readable').
state.readableListening = this.listenerCount('readable') > 0;
// Try start flowing on next tick if stream isn't explicitly paused.
if (state.flowing !== false)
this.resume();
} else if (ev === 'readable') {
if (!state.endEmitted && !state.readableListening) {
state.readableListening = state.needReadable = true;
state.flowing = false;
state.emittedReadable = false;
debug('on readable', state.length, state.reading);
if (state.length) {
emitReadable(this);
} else if (!state.reading) {
process.nextTick(nReadingNextTick, this);
}
}
}
return res;
};
Readable.prototype.addListener = Readable.prototype.on;
Readable.prototype.removeListener = function(ev, fn) {
const res = Stream.prototype.removeListener.call(this,
ev, fn);
if (ev === 'readable') {
// We need to check if there is someone still listening to
// readable and reset the state. However this needs to happen
// after readable has been emitted but before I/O (nextTick) to
// support once('readable', fn) cycles. This means that calling
// resume within the same tick will have no
// effect.
process.nextTick(updateReadableListening, this);
}
return res;
};
Readable.prototype.off = Readable.prototype.removeListener;
Readable.prototype.removeAllListeners = function(ev) {
const res = Stream.prototype.removeAllListeners.apply(this,
arguments);
if (ev === 'readable' || ev === undefined) {
// We need to check if there is someone still listening to
// readable and reset the state. However this needs to happen
// after readable has been emitted but before I/O (nextTick) to
// support once('readable', fn) cycles. This means that calling
// resume within the same tick will have no
// effect.
process.nextTick(updateReadableListening, this);
}
return res;
};
function updateReadableListening(self) {
const state = self._readableState;
state.readableListening = self.listenerCount('readable') > 0;
if (state.resumeScheduled && state[kPaused] === false) {
// Flowing needs to be set to true now, otherwise
// the upcoming resume will not flow.
state.flowing = true;
// Crude way to check if we should resume.
} else if (self.listenerCount('data') > 0) {
self.resume();
} else if (!state.readableListening) {
state.flowing = null;
}
}
function nReadingNextTick(self) {
debug('readable nexttick read 0');
self.read(0);
}
// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function() {
const state = this._readableState;
if (!state.flowing) {
debug('resume');
// We flow only if there is no one listening
// for readable, but we still have to call
// resume().
state.flowing = !state.readableListening;
resume(this, state);
}
state[kPaused] = false;
return this;
};
function resume(stream, state) {
if (!state.resumeScheduled) {
state.resumeScheduled = true;
process.nextTick(resume_, stream, state);
}
}
function resume_(stream, state) {
debug('resume', state.reading);
if (!state.reading) {
stream.read(0);
}
state.resumeScheduled = false;
stream.emit('resume');
flow(stream);
if (state.flowing && !state.reading)
stream.read(0);
}
Readable.prototype.pause = function() {
debug('call pause flowing=%j', this._readableState.flowing);
if (this._readableState.flowing !== false) {
debug('pause');
this._readableState.flowing = false;
this.emit('pause');
}
this._readableState[kPaused] = true;
return this;
};
function flow(stream) {
const state = stream._readableState;
debug('flow', state.flowing);
while (state.flowing && stream.read() !== null);
}
// Wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function(stream) {
let paused = false;
// TODO (ronag): Should this.destroy(err) emit
// 'error' on the wrapped stream? Would require
// a static factory method, e.g. Readable.wrap(stream).
stream.on('data', (chunk) => {
if (!this.push(chunk) && stream.pause) {
paused = true;
stream.pause();
}
});
stream.on('end', () => {
this.push(null);
});
stream.on('error', (err) => {
errorOrDestroy(this, err);
});
stream.on('close', () => {
this.destroy();
});
stream.on('destroy', () => {
this.destroy();
});
this._read = () => {
if (paused && stream.resume) {
paused = false;
stream.resume();
}
};
// Proxy all the other methods. Important when wrapping filters and duplexes.
const streamKeys = ObjectKeys(stream);
for (let j = 1; j < streamKeys.length; j++) {
const i = streamKeys[j];
if (this[i] === undefined && typeof stream[i] === 'function') {
this[i] = stream[i].bind(stream);
}
}
return this;
};
Readable.prototype[SymbolAsyncIterator] = function() {
return streamToAsyncIterator(this);
};
Readable.prototype.iterator = function(options) {
if (options !== undefined) {
validateObject(options, 'options');
}
return streamToAsyncIterator(this, options);
};
function streamToAsyncIterator(stream, options) {
if (typeof stream.read !== 'function') {
stream = Readable.wrap(stream, { objectMode: true });
}
const iter = createAsyncIterator(stream, options);
iter.stream = stream;
return iter;
}
async function* createAsyncIterator(stream, options) {
let callback = nop;
function next(resolve) {
if (this === stream) {
callback();
callback = nop;
} else {
callback = resolve;
}
}
stream.on('readable', next);
let error;
eos(stream, { writable: false }, (err) => {
error = err ? aggregateTwoErrors(error, err) : null;
callback();
callback = nop;
});
try {
while (true) {
const chunk = stream.destroyed ? null : stream.read();
if (chunk !== null) {
yield chunk;
} else if (error) {
throw error;
} else if (error === null) {
return;
} else {
await new Promise(next);
}
}
} catch (err) {
error = aggregateTwoErrors(error, err);
throw error;
} finally {
if (
(error || options?.destroyOnReturn !== false) &&
(error === undefined || stream._readableState.autoDestroy)
) {
destroyImpl.destroyer(stream, null);
}
}
}
// Making it explicit these properties are not enumerable
// because otherwise some prototype manipulation in
// userland will fail.
ObjectDefineProperties(Readable.prototype, {
readable: {
get() {
const r = this._readableState;
// r.readable === false means that this is part of a Duplex stream
// where the readable side was disabled upon construction.
// Compat. The user might manually disable readable side through
// deprecated setter.
return !!r && r.readable !== false && !r.destroyed && !r.errorEmitted &&
!r.endEmitted;
},
set(val) {
// Backwards compat.
if (this._readableState) {
this._readableState.readable = !!val;
}
}
},
readableDidRead: {
enumerable: false,
get: function() {
return this._readableState.dataEmitted;
}
},
readableAborted: {
enumerable: false,
get: function() {
return !!(
this._readableState.readable !== false &&
(this._readableState.destroyed || this._readableState.errored) &&
!this._readableState.endEmitted
);
}
},
readableHighWaterMark: {
enumerable: false,
get: function() {
return this._readableState.highWaterMark;
}
},
readableBuffer: {
enumerable: false,
get: function() {
return this._readableState && this._readableState.buffer;
}
},
readableFlowing: {
enumerable: false,
get: function() {
return this._readableState.flowing;
},
set: function(state) {
if (this._readableState) {
this._readableState.flowing = state;
}
}
},
readableLength: {
enumerable: false,
get() {
return this._readableState.length;
}
},
readableObjectMode: {
enumerable: false,
get() {
return this._readableState ? this._readableState.objectMode : false;
}
},
readableEncoding: {
enumerable: false,
get() {
return this._readableState ? this._readableState.encoding : null;
}
},
errored: {
enumerable: false,
get() {
return this._readableState ? this._readableState.errored : null;
}
},
closed: {
get() {
return this._readableState ? this._readableState.closed : false;
}
},
destroyed: {
enumerable: false,
get() {
return this._readableState ? this._readableState.destroyed : false;
},
set(value) {
// We ignore the value if the stream
// has not been initialized yet.
if (!this._readableState) {
return;
}
// Backward compatibility, the user is explicitly
// managing destroyed.
this._readableState.destroyed = value;
}
},
readableEnded: {
enumerable: false,
get() {
return this._readableState ? this._readableState.endEmitted : false;
}
},
});
ObjectDefineProperties(ReadableState.prototype, {
// Legacy getter for `pipesCount`.
pipesCount: {
get() {
return this.pipes.length;
}
},
// Legacy property for `paused`.
paused: {
get() {
return this[kPaused] !== false;
},
set(value) {
this[kPaused] = !!value;
}
}
});
// Exposed for testing purposes only.
Readable._fromList = fromList;
// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
// nothing buffered.
if (state.length === 0)
return null;
let ret;
if (state.objectMode)
ret = state.buffer.shift();
else if (!n || n >= state.length) {
// Read it all, truncate the list.
if (state.decoder)
ret = state.buffer.join('');
else if (state.buffer.length === 1)
ret = state.buffer.first();
else
ret = state.buffer.concat(state.length);
state.buffer.clear();
} else {
// read part of list.
ret = state.buffer.consume(n, state.decoder);
}
return ret;
}
function endReadable(stream) {
const state = stream._readableState;
debug('endReadable', state.endEmitted);
if (!state.endEmitted) {
state.ended = true;
process.nextTick(endReadableNT, state, stream);
}
}
function endReadableNT(state, stream) {
debug('endReadableNT', state.endEmitted, state.length);
// Check that we didn't get one last unshift.
if (!state.errored && !state.closeEmitted &&
!state.endEmitted && state.length === 0) {
state.endEmitted = true;
stream.emit('end');
if (stream.writable && stream.allowHalfOpen === false) {
process.nextTick(endWritableNT, stream);
} else if (state.autoDestroy) {
// In case of duplex streams we need a way to detect
// if the writable side is ready for autoDestroy as well.
const wState = stream._writableState;
const autoDestroy = !wState || (
wState.autoDestroy &&
// We don't expect the writable to ever 'finish'
// if writable is explicitly set to false.
(wState.finished || wState.writable === false)
);
if (autoDestroy) {
stream.destroy();
}
}
}
}
function endWritableNT(stream) {
const writable = stream.writable && !stream.writableEnded &&
!stream.destroyed;
if (writable) {
stream.end();
}
}
Readable.from = function(iterable, opts) {
return from(Readable, iterable, opts);
};
let webStreamsAdapters;
// Lazy to avoid circular references
function lazyWebStreams() {
if (webStreamsAdapters === undefined)
webStreamsAdapters = require('internal/webstreams/adapters');
return webStreamsAdapters;
}
Readable.fromWeb = function(readableStream, options) {
return lazyWebStreams().newStreamReadableFromReadableStream(
readableStream,
options);
};
Readable.toWeb = function(streamReadable) {
return lazyWebStreams().newReadableStreamFromStreamReadable(streamReadable);
};
Readable.wrap = function(src, options) {
return new Readable({
objectMode: src.readableObjectMode ?? src.objectMode ?? true,
...options,
destroy(err, callback) {
destroyImpl.destroyer(src, err);
callback(err);
}
}).wrap(src);
};
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