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const {
Array,
Symbol,
} = primordials;
const { Buffer } = require('buffer');
const { FastBuffer } = require('internal/buffer');
const {
WriteWrap,
kReadBytesOrError,
kArrayBufferOffset,
kBytesWritten,
kLastWriteWasAsync,
streamBaseState
} = internalBinding('stream_wrap');
const { UV_EOF } = internalBinding('uv');
const {
errnoException
} = require('internal/errors');
const { owner_symbol } = require('internal/async_hooks').symbols;
const {
kTimeout,
setUnrefTimeout,
getTimerDuration
} = require('internal/timers');
const { isUint8Array } = require('internal/util/types');
const { clearTimeout } = require('timers');
const { validateFunction } = require('internal/validators');
const kMaybeDestroy = Symbol('kMaybeDestroy');
const kUpdateTimer = Symbol('kUpdateTimer');
const kAfterAsyncWrite = Symbol('kAfterAsyncWrite');
const kHandle = Symbol('kHandle');
const kSession = Symbol('kSession');
let debug = require('internal/util/debuglog').debuglog('stream', (fn) => {
debug = fn;
});
const kBuffer = Symbol('kBuffer');
const kBufferGen = Symbol('kBufferGen');
const kBufferCb = Symbol('kBufferCb');
function handleWriteReq(req, data, encoding) {
const { handle } = req;
switch (encoding) {
case 'buffer':
{
const ret = handle.writeBuffer(req, data);
if (streamBaseState[kLastWriteWasAsync])
req.buffer = data;
return ret;
}
case 'latin1':
case 'binary':
return handle.writeLatin1String(req, data);
case 'utf8':
case 'utf-8':
return handle.writeUtf8String(req, data);
case 'ascii':
return handle.writeAsciiString(req, data);
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return handle.writeUcs2String(req, data);
default:
{
const buffer = Buffer.from(data, encoding);
const ret = handle.writeBuffer(req, buffer);
if (streamBaseState[kLastWriteWasAsync])
req.buffer = buffer;
return ret;
}
}
}
function onWriteComplete(status) {
debug('onWriteComplete', status, this.error);
const stream = this.handle[owner_symbol];
if (stream.destroyed) {
if (typeof this.callback === 'function')
this.callback(null);
return;
}
// TODO (ronag): This should be moved before if(stream.destroyed)
// in order to avoid swallowing error.
if (status < 0) {
const ex = errnoException(status, 'write', this.error);
if (typeof this.callback === 'function')
this.callback(ex);
else
stream.destroy(ex);
return;
}
stream[kUpdateTimer]();
stream[kAfterAsyncWrite](this);
if (typeof this.callback === 'function')
this.callback(null);
}
function createWriteWrap(handle, callback) {
const req = new WriteWrap();
req.handle = handle;
req.oncomplete = onWriteComplete;
req.async = false;
req.bytes = 0;
req.buffer = null;
req.callback = callback;
return req;
}
function writevGeneric(self, data, cb) {
const req = createWriteWrap(self[kHandle], cb);
const allBuffers = data.allBuffers;
let chunks;
if (allBuffers) {
chunks = data;
for (let i = 0; i < data.length; i++)
data[i] = data[i].chunk;
} else {
chunks = new Array(data.length << 1);
for (let i = 0; i < data.length; i++) {
const entry = data[i];
chunks[i * 2] = entry.chunk;
chunks[i * 2 + 1] = entry.encoding;
}
}
const err = req.handle.writev(req, chunks, allBuffers);
// Retain chunks
if (err === 0) req._chunks = chunks;
afterWriteDispatched(req, err, cb);
return req;
}
function writeGeneric(self, data, encoding, cb) {
const req = createWriteWrap(self[kHandle], cb);
const err = handleWriteReq(req, data, encoding);
afterWriteDispatched(req, err, cb);
return req;
}
function afterWriteDispatched(req, err, cb) {
req.bytes = streamBaseState[kBytesWritten];
req.async = !!streamBaseState[kLastWriteWasAsync];
if (err !== 0)
return cb(errnoException(err, 'write', req.error));
if (!req.async && typeof req.callback === 'function') {
req.callback();
}
}
function onStreamRead(arrayBuffer) {
const nread = streamBaseState[kReadBytesOrError];
const handle = this;
const stream = this[owner_symbol];
stream[kUpdateTimer]();
if (nread > 0 && !stream.destroyed) {
let ret;
let result;
const userBuf = stream[kBuffer];
if (userBuf) {
result = (stream[kBufferCb](nread, userBuf) !== false);
const bufGen = stream[kBufferGen];
if (bufGen !== null) {
const nextBuf = bufGen();
if (isUint8Array(nextBuf))
stream[kBuffer] = ret = nextBuf;
}
} else {
const offset = streamBaseState[kArrayBufferOffset];
const buf = new FastBuffer(arrayBuffer, offset, nread);
result = stream.push(buf);
}
if (!result) {
handle.reading = false;
if (!stream.destroyed) {
const err = handle.readStop();
if (err)
stream.destroy(errnoException(err, 'read'));
}
}
return ret;
}
if (nread === 0) {
return;
}
// After seeing EOF, most streams will be closed permanently,
// and will not deliver any more read events after this point.
// (equivalently, it should have called readStop on itself already).
// Some streams may be reset and explicitly started again with a call
// to readStart, such as TTY.
if (nread !== UV_EOF) {
// CallJSOnreadMethod expects the return value to be a buffer.
// Ref: https://github.com/nodejs/node/pull/34375
stream.destroy(errnoException(nread, 'read'));
return;
}
// Defer this until we actually emit end
if (stream._readableState.endEmitted) {
if (stream[kMaybeDestroy])
stream[kMaybeDestroy]();
} else {
if (stream[kMaybeDestroy])
stream.on('end', stream[kMaybeDestroy]);
// Push a null to signal the end of data.
// Do it before `maybeDestroy` for correct order of events:
// `end` -> `close`
stream.push(null);
stream.read(0);
}
}
function setStreamTimeout(msecs, callback) {
if (this.destroyed)
return this;
this.timeout = msecs;
// Type checking identical to timers.enroll()
msecs = getTimerDuration(msecs, 'msecs');
// Attempt to clear an existing timer in both cases -
// even if it will be rescheduled we don't want to leak an existing timer.
clearTimeout(this[kTimeout]);
if (msecs === 0) {
if (callback !== undefined) {
validateFunction(callback, 'callback');
this.removeListener('timeout', callback);
}
} else {
this[kTimeout] = setUnrefTimeout(this._onTimeout.bind(this), msecs);
if (this[kSession]) this[kSession][kUpdateTimer]();
if (callback !== undefined) {
validateFunction(callback, 'callback');
this.once('timeout', callback);
}
}
return this;
}
module.exports = {
writevGeneric,
writeGeneric,
onStreamRead,
kAfterAsyncWrite,
kMaybeDestroy,
kUpdateTimer,
kHandle,
kSession,
setStreamTimeout,
kBuffer,
kBufferCb,
kBufferGen
};
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