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// Ported from https://github.com/mafintosh/end-of-stream with
// permission from the author, Mathias Buus (@mafintosh).
'use strict';
const {
ERR_INVALID_ARG_TYPE,
ERR_STREAM_PREMATURE_CLOSE
} = require('internal/errors').codes;
const { once } = require('internal/util');
function isRequest(stream) {
return stream.setHeader && typeof stream.abort === 'function';
}
function isReadable(stream) {
return typeof stream.readable === 'boolean' ||
typeof stream.readableEnded === 'boolean' ||
!!stream._readableState;
}
function isWritable(stream) {
return typeof stream.writable === 'boolean' ||
typeof stream.writableEnded === 'boolean' ||
!!stream._writableState;
}
function isWritableFinished(stream) {
if (stream.writableFinished) return true;
const wState = stream._writableState;
if (!wState || wState.errored) return false;
return wState.finished || (wState.ended && wState.length === 0);
}
function nop() {}
function isReadableEnded(stream) {
if (stream.readableEnded) return true;
const rState = stream._readableState;
if (!rState || rState.errored) return false;
return rState.endEmitted || (rState.ended && rState.length === 0);
}
function eos(stream, options, callback) {
if (arguments.length === 2) {
callback = options;
options = {};
} else if (options == null) {
options = {};
} else if (typeof options !== 'object') {
throw new ERR_INVALID_ARG_TYPE('options', 'object', options);
}
if (typeof callback !== 'function') {
throw new ERR_INVALID_ARG_TYPE('callback', 'function', callback);
}
callback = once(callback);
const readable = options.readable ||
(options.readable !== false && isReadable(stream));
const writable = options.writable ||
(options.writable !== false && isWritable(stream));
const wState = stream._writableState;
const rState = stream._readableState;
const state = wState || rState;
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 = (
state &&
state.autoDestroy &&
state.emitClose &&
state.closed === false &&
isReadable(stream) === readable &&
isWritable(stream) === writable
);
let writableFinished = stream.writableFinished ||
(wState && wState.finished);
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 || readableEnded) callback.call(stream);
};
let readableEnded = stream.readableEnded ||
(rState && rState.endEmitted);
const onend = () => {
readableEnded = 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);
};
const onclose = () => {
if (readable && !readableEnded) {
if (!isReadableEnded(stream))
return callback.call(stream, new ERR_STREAM_PREMATURE_CLOSE());
}
if (writable && !writableFinished) {
if (!isWritableFinished(stream))
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);
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 (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);
// _closed is for OutgoingMessage which is not a proper Writable.
const closed = (!wState && !rState && stream._closed === true) || (
(wState && wState.closed) ||
(rState && rState.closed) ||
(wState && wState.errorEmitted) ||
(rState && rState.errorEmitted) ||
(rState && stream.req && stream.aborted) ||
(
(!writable || (wState && wState.finished)) &&
(!readable || (rState && rState.endEmitted))
)
);
if (closed) {
// TODO(ronag): Re-throw error if errorEmitted?
// TODO(ronag): Throw premature close as if finished was called?
// before being closed? i.e. if closed but not errored, ended or finished.
// TODO(ronag): Throw some kind of error? Does it make sense
// to call finished() on a "finished" stream?
// TODO(ronag): willEmitClose?
process.nextTick(() => {
callback();
});
}
return function() {
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);
};
}
module.exports = eos;
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