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const {
Symbol,
SymbolAsyncIterator,
SymbolIterator,
} = primordials;
const kDestroyed = Symbol('kDestroyed');
const kIsErrored = Symbol('kIsErrored');
const kIsReadable = Symbol('kIsReadable');
const kIsDisturbed = Symbol('kIsDisturbed');
function isReadableNodeStream(obj, strict = false) {
return !!(
obj &&
typeof obj.pipe === 'function' &&
typeof obj.on === 'function' &&
(
!strict ||
(typeof obj.pause === 'function' && typeof obj.resume === 'function')
) &&
(!obj._writableState || obj._readableState?.readable !== false) && // Duplex
(!obj._writableState || obj._readableState) // Writable has .pipe.
);
}
function isWritableNodeStream(obj) {
return !!(
obj &&
typeof obj.write === 'function' &&
typeof obj.on === 'function' &&
(!obj._readableState || obj._writableState?.writable !== false) // Duplex
);
}
function isDuplexNodeStream(obj) {
return !!(
obj &&
(typeof obj.pipe === 'function' && obj._readableState) &&
typeof obj.on === 'function' &&
typeof obj.write === 'function'
);
}
function isNodeStream(obj) {
return (
obj &&
(
obj._readableState ||
obj._writableState ||
(typeof obj.write === 'function' && typeof obj.on === 'function') ||
(typeof obj.pipe === 'function' && typeof obj.on === 'function')
)
);
}
function isIterable(obj, isAsync) {
if (obj == null) return false;
if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
return typeof obj[SymbolAsyncIterator] === 'function' ||
typeof obj[SymbolIterator] === 'function';
}
function isDestroyed(stream) {
if (!isNodeStream(stream)) return null;
const wState = stream._writableState;
const rState = stream._readableState;
const state = wState || rState;
return !!(stream.destroyed || stream[kDestroyed] || state?.destroyed);
}
// Have been end():d.
function isWritableEnded(stream) {
if (!isWritableNodeStream(stream)) return null;
if (stream.writableEnded === true) return true;
const wState = stream._writableState;
if (wState?.errored) return false;
if (typeof wState?.ended !== 'boolean') return null;
return wState.ended;
}
// Have emitted 'finish'.
function isWritableFinished(stream, strict) {
if (!isWritableNodeStream(stream)) return null;
if (stream.writableFinished === true) return true;
const wState = stream._writableState;
if (wState?.errored) return false;
if (typeof wState?.finished !== 'boolean') return null;
return !!(
wState.finished ||
(strict === false && wState.ended === true && wState.length === 0)
);
}
// Have been push(null):d.
function isReadableEnded(stream) {
if (!isReadableNodeStream(stream)) return null;
if (stream.readableEnded === true) return true;
const rState = stream._readableState;
if (!rState || rState.errored) return false;
if (typeof rState?.ended !== 'boolean') return null;
return rState.ended;
}
// Have emitted 'end'.
function isReadableFinished(stream, strict) {
if (!isReadableNodeStream(stream)) return null;
const rState = stream._readableState;
if (rState?.errored) return false;
if (typeof rState?.endEmitted !== 'boolean') return null;
return !!(
rState.endEmitted ||
(strict === false && rState.ended === true && rState.length === 0)
);
}
function isReadable(stream) {
if (stream && stream[kIsReadable] != null) return stream[kIsReadable];
if (typeof stream?.readable !== 'boolean') return null;
if (isDestroyed(stream)) return false;
return isReadableNodeStream(stream) &&
stream.readable &&
!isReadableFinished(stream);
}
function isWritable(stream) {
if (typeof stream?.writable !== 'boolean') return null;
if (isDestroyed(stream)) return false;
return isWritableNodeStream(stream) &&
stream.writable &&
!isWritableEnded(stream);
}
function isFinished(stream, opts) {
if (!isNodeStream(stream)) {
return null;
}
if (isDestroyed(stream)) {
return true;
}
if (opts?.readable !== false && isReadable(stream)) {
return false;
}
if (opts?.writable !== false && isWritable(stream)) {
return false;
}
return true;
}
function isWritableErrored(stream) {
if (!isNodeStream(stream)) {
return null;
}
if (stream.writableErrored) {
return stream.writableErrored;
}
return stream._writableState?.errored ?? null;
}
function isReadableErrored(stream) {
if (!isNodeStream(stream)) {
return null;
}
if (stream.readableErrored) {
return stream.readableErrored;
}
return stream._readableState?.errored ?? null;
}
function isClosed(stream) {
if (!isNodeStream(stream)) {
return null;
}
if (typeof stream.closed === 'boolean') {
return stream.closed;
}
const wState = stream._writableState;
const rState = stream._readableState;
if (
typeof wState?.closed === 'boolean' ||
typeof rState?.closed === 'boolean'
) {
return wState?.closed || rState?.closed;
}
if (typeof stream._closed === 'boolean' && isOutgoingMessage(stream)) {
return stream._closed;
}
return null;
}
function isOutgoingMessage(stream) {
return (
typeof stream._closed === 'boolean' &&
typeof stream._defaultKeepAlive === 'boolean' &&
typeof stream._removedConnection === 'boolean' &&
typeof stream._removedContLen === 'boolean'
);
}
function isServerResponse(stream) {
return (
typeof stream._sent100 === 'boolean' &&
isOutgoingMessage(stream)
);
}
function isServerRequest(stream) {
return (
typeof stream._consuming === 'boolean' &&
typeof stream._dumped === 'boolean' &&
stream.req?.upgradeOrConnect === undefined
);
}
function willEmitClose(stream) {
if (!isNodeStream(stream)) return null;
const wState = stream._writableState;
const rState = stream._readableState;
const state = wState || rState;
return (!state && isServerResponse(stream)) || !!(
state &&
state.autoDestroy &&
state.emitClose &&
state.closed === false
);
}
function isDisturbed(stream) {
return !!(stream && (
stream[kIsDisturbed] ??
(stream.readableDidRead || stream.readableAborted)
));
}
function isErrored(stream) {
return !!(stream && (
stream[kIsErrored] ??
stream.readableErrored ??
stream.writableErrored ??
stream._readableState?.errorEmitted ??
stream._writableState?.errorEmitted ??
stream._readableState?.errored ??
stream._writableState?.errored
));
}
module.exports = {
kDestroyed,
isDisturbed,
kIsDisturbed,
isErrored,
kIsErrored,
isReadable,
kIsReadable,
isClosed,
isDestroyed,
isDuplexNodeStream,
isFinished,
isIterable,
isReadableNodeStream,
isReadableEnded,
isReadableFinished,
isReadableErrored,
isNodeStream,
isWritable,
isWritableNodeStream,
isWritableEnded,
isWritableFinished,
isWritableErrored,
isServerRequest,
isServerResponse,
willEmitClose,
};
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