1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
'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 { errnoException } = require('internal/errors');
const { owner_symbol } = require('internal/async_hooks').symbols;
const kMaybeDestroy = Symbol('kMaybeDestroy');
const kUpdateTimer = Symbol('kUpdateTimer');
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 createWriteWrap(handle, oncomplete) {
var req = new WriteWrap();
req.handle = handle;
req.oncomplete = oncomplete;
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);
}
}
module.exports = {
createWriteWrap,
writevGeneric,
writeGeneric,
onStreamRead,
kMaybeDestroy,
kUpdateTimer,
};
|
