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'use strict';
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 {
codes: {
ERR_INVALID_CALLBACK
},
errnoException
} = require('internal/errors');
const { owner_symbol } = require('internal/async_hooks').symbols;
const {
kTimeout,
setUnrefTimeout,
validateTimerDuration
} = require('internal/timers');
const kMaybeDestroy = Symbol('kMaybeDestroy');
const kUpdateTimer = Symbol('kUpdateTimer');
const kAfterAsyncWrite = Symbol('kAfterAsyncWrite');
const kSession = Symbol('session');
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) {
const stream = this.handle[owner_symbol];
if (stream.destroyed) {
if (typeof this.callback === 'function')
this.callback(null);
return;
}
if (status < 0) {
const ex = errnoException(status, 'write', this.error);
stream.destroy(ex, this.callback);
return;
}
stream[kUpdateTimer]();
stream[kAfterAsyncWrite](this);
if (typeof this.callback === 'function')
this.callback(null);
}
function createWriteWrap(handle) {
var req = new WriteWrap();
req.handle = handle;
req.oncomplete = onWriteComplete;
req.async = false;
req.bytes = 0;
req.buffer = null;
return req;
}
function writevGeneric(self, req, data, cb) {
var allBuffers = data.allBuffers;
var chunks;
var i;
if (allBuffers) {
chunks = data;
for (i = 0; i < data.length; i++)
data[i] = data[i].chunk;
} else {
chunks = new Array(data.length << 1);
for (i = 0; i < data.length; i++) {
var entry = data[i];
chunks[i * 2] = entry.chunk;
chunks[i * 2 + 1] = entry.encoding;
}
}
var err = req.handle.writev(req, chunks, allBuffers);
// Retain chunks
if (err === 0) req._chunks = chunks;
afterWriteDispatched(self, req, err, cb);
}
function writeGeneric(self, req, data, encoding, cb) {
var err = handleWriteReq(req, data, encoding);
afterWriteDispatched(self, req, err, cb);
}
function afterWriteDispatched(self, req, err, cb) {
req.bytes = streamBaseState[kBytesWritten];
req.async = !!streamBaseState[kLastWriteWasAsync];
if (err !== 0)
return self.destroy(errnoException(err, 'write', req.error), cb);
if (!req.async) {
cb();
} else {
req.callback = cb;
}
}
function onStreamRead(arrayBuffer) {
const nread = streamBaseState[kReadBytesOrError];
const handle = this;
const stream = this[owner_symbol];
stream[kUpdateTimer]();
if (nread > 0 && !stream.destroyed) {
const offset = streamBaseState[kArrayBufferOffset];
const buf = new FastBuffer(arrayBuffer, offset, nread);
if (!stream.push(buf)) {
handle.reading = false;
if (!stream.destroyed) {
const err = handle.readStop();
if (err)
stream.destroy(errnoException(err, 'read'));
}
}
return;
}
if (nread === 0) {
return;
}
if (nread !== UV_EOF) {
return stream.destroy(errnoException(nread, 'read'));
}
// 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.timeout = msecs;
// Type checking identical to timers.enroll()
msecs = validateTimerDuration(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) {
if (typeof callback !== 'function')
throw new ERR_INVALID_CALLBACK();
this.removeListener('timeout', callback);
}
} else {
this[kTimeout] = setUnrefTimeout(this._onTimeout.bind(this), msecs);
if (this[kSession]) this[kSession][kUpdateTimer]();
if (callback !== undefined) {
if (typeof callback !== 'function')
throw new ERR_INVALID_CALLBACK();
this.once('timeout', callback);
}
}
return this;
}
module.exports = {
createWriteWrap,
writevGeneric,
writeGeneric,
onStreamRead,
kAfterAsyncWrite,
kMaybeDestroy,
kUpdateTimer,
kSession,
setStreamTimeout
};
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