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// permission from the author, Mathias Buus (@mafintosh).
'use strict';
const {
AbortError,
codes,
} = require('internal/errors');
const {
ERR_INVALID_ARG_TYPE,
ERR_STREAM_PREMATURE_CLOSE
} = codes;
const {
kEmptyObject,
once,
} = require('internal/util');
const {
validateAbortSignal,
validateFunction,
validateObject,
validateBoolean
} = require('internal/validators');
const { Promise } = primordials;
const {
isClosed,
isReadable,
isReadableNodeStream,
isReadableFinished,
isReadableErrored,
isWritable,
isWritableNodeStream,
isWritableFinished,
isWritableErrored,
isNodeStream,
willEmitClose: _willEmitClose,
} = require('internal/streams/utils');
function isRequest(stream) {
return stream.setHeader && typeof stream.abort === 'function';
}
const nop = () => {};
function eos(stream, options, callback) {
if (arguments.length === 2) {
callback = options;
options = kEmptyObject;
} else if (options == null) {
options = kEmptyObject;
} else {
validateObject(options, 'options');
}
validateFunction(callback, 'callback');
validateAbortSignal(options.signal, 'options.signal');
callback = once(callback);
const readable = options.readable ?? isReadableNodeStream(stream);
const writable = options.writable ?? isWritableNodeStream(stream);
if (!isNodeStream(stream)) {
// TODO: Webstreams.
throw new ERR_INVALID_ARG_TYPE('stream', 'Stream', stream);
}
const wState = stream._writableState;
const rState = stream._readableState;
const onlegacyfinish = () => {
if (!stream.writable) {
onfinish();
}
};
// TODO (ronag): Improve soft detection to include core modules and
// common ecosystem modules that do properly emit 'close' but fail
// this generic check.
let willEmitClose = (
_willEmitClose(stream) &&
isReadableNodeStream(stream) === readable &&
isWritableNodeStream(stream) === writable
);
let writableFinished = isWritableFinished(stream, false);
const onfinish = () => {
writableFinished = true;
// Stream should not be destroyed here. If it is that
// means that user space is doing something differently and
// we cannot trust willEmitClose.
if (stream.destroyed) {
willEmitClose = false;
}
if (willEmitClose && (!stream.readable || readable)) {
return;
}
if (!readable || readableFinished) {
callback.call(stream);
}
};
let readableFinished = isReadableFinished(stream, false);
const onend = () => {
readableFinished = true;
// Stream should not be destroyed here. If it is that
// means that user space is doing something differently and
// we cannot trust willEmitClose.
if (stream.destroyed) {
willEmitClose = false;
}
if (willEmitClose && (!stream.writable || writable)) {
return;
}
if (!writable || writableFinished) {
callback.call(stream);
}
};
const onerror = (err) => {
callback.call(stream, err);
};
let closed = isClosed(stream);
const onclose = () => {
closed = true;
const errored = isWritableErrored(stream) || isReadableErrored(stream);
if (errored && typeof errored !== 'boolean') {
return callback.call(stream, errored);
}
if (readable && !readableFinished && isReadableNodeStream(stream, true)) {
if (!isReadableFinished(stream, false))
return callback.call(stream,
new ERR_STREAM_PREMATURE_CLOSE());
}
if (writable && !writableFinished) {
if (!isWritableFinished(stream, false))
return callback.call(stream,
new ERR_STREAM_PREMATURE_CLOSE());
}
callback.call(stream);
};
const onrequest = () => {
stream.req.on('finish', onfinish);
};
if (isRequest(stream)) {
stream.on('complete', onfinish);
if (!willEmitClose) {
stream.on('abort', onclose);
}
if (stream.req) {
onrequest();
} else {
stream.on('request', onrequest);
}
} else if (writable && !wState) { // legacy streams
stream.on('end', onlegacyfinish);
stream.on('close', onlegacyfinish);
}
// Not all streams will emit 'close' after 'aborted'.
if (!willEmitClose && typeof stream.aborted === 'boolean') {
stream.on('aborted', onclose);
}
stream.on('end', onend);
stream.on('finish', onfinish);
if (options.error !== false) {
stream.on('error', onerror);
}
stream.on('close', onclose);
if (closed) {
process.nextTick(onclose);
} else if (wState?.errorEmitted || rState?.errorEmitted) {
if (!willEmitClose) {
process.nextTick(onclose);
}
} else if (
!readable &&
(!willEmitClose || isReadable(stream)) &&
(writableFinished || isWritable(stream) === false)
) {
process.nextTick(onclose);
} else if (
!writable &&
(!willEmitClose || isWritable(stream)) &&
(readableFinished || isReadable(stream) === false)
) {
process.nextTick(onclose);
} else if ((rState && stream.req && stream.aborted)) {
process.nextTick(onclose);
}
const cleanup = () => {
callback = nop;
stream.removeListener('aborted', onclose);
stream.removeListener('complete', onfinish);
stream.removeListener('abort', onclose);
stream.removeListener('request', onrequest);
if (stream.req) stream.req.removeListener('finish', onfinish);
stream.removeListener('end', onlegacyfinish);
stream.removeListener('close', onlegacyfinish);
stream.removeListener('finish', onfinish);
stream.removeListener('end', onend);
stream.removeListener('error', onerror);
stream.removeListener('close', onclose);
};
if (options.signal && !closed) {
const abort = () => {
// Keep it because cleanup removes it.
const endCallback = callback;
cleanup();
endCallback.call(
stream,
new AbortError(undefined, { cause: options.signal.reason }));
};
if (options.signal.aborted) {
process.nextTick(abort);
} else {
const originalCallback = callback;
callback = once((...args) => {
options.signal.removeEventListener('abort', abort);
originalCallback.apply(stream, args);
});
options.signal.addEventListener('abort', abort);
}
}
return cleanup;
}
function finished(stream, opts) {
let autoCleanup = false;
if (opts === null) {
opts = kEmptyObject;
}
if (opts?.cleanup) {
validateBoolean(opts.cleanup, 'cleanup');
autoCleanup = opts.cleanup;
}
return new Promise((resolve, reject) => {
const cleanup = eos(stream, opts, (err) => {
if (autoCleanup) {
cleanup();
}
if (err) {
reject(err);
} else {
resolve();
}
});
});
}
module.exports = eos;
module.exports.finished = finished;
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