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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
'use strict';
const assert = require('assert');
const util = require('util');
const { Socket } = require('net');
const { JSStream } = process.binding('js_stream');
const uv = process.binding('uv');
const debug = util.debuglog('stream_wrap');
const errors = require('internal/errors');
function StreamWrap(stream) {
const handle = new JSStream();
this.stream = stream;
this._list = null;
const self = this;
handle.close = function(cb) {
debug('close');
self.doClose(cb);
};
handle.isAlive = function() {
return self.isAlive();
};
handle.isClosing = function() {
return self.isClosing();
};
handle.onreadstart = function() {
return self.readStart();
};
handle.onreadstop = function() {
return self.readStop();
};
handle.onshutdown = function(req) {
return self.doShutdown(req);
};
handle.onwrite = function(req, bufs) {
return self.doWrite(req, bufs);
};
this.stream.pause();
this.stream.on('error', function onerror(err) {
self.emit('error', err);
});
this.stream.on('data', function ondata(chunk) {
if (typeof chunk === 'string' || this._readableState.objectMode === true) {
// Make sure that no further `data` events will happen
this.pause();
this.removeListener('data', ondata);
self.emit('error', new errors.Error('ERR_STREAM_WRAP'));
return;
}
debug('data', chunk.length);
if (self._handle)
self._handle.readBuffer(chunk);
});
this.stream.once('end', function onend() {
debug('end');
if (self._handle)
self._handle.emitEOF();
});
Socket.call(this, {
handle: handle
});
}
util.inherits(StreamWrap, Socket);
module.exports = StreamWrap;
// require('_stream_wrap').StreamWrap
StreamWrap.StreamWrap = StreamWrap;
StreamWrap.prototype.isAlive = function isAlive() {
return true;
};
StreamWrap.prototype.isClosing = function isClosing() {
return !this.readable || !this.writable;
};
StreamWrap.prototype.readStart = function readStart() {
this.stream.resume();
return 0;
};
StreamWrap.prototype.readStop = function readStop() {
this.stream.pause();
return 0;
};
StreamWrap.prototype.doShutdown = function doShutdown(req) {
const self = this;
const handle = this._handle;
const item = this._enqueue('shutdown', req);
this.stream.end(function() {
// Ensure that write was dispatched
setImmediate(function() {
if (!self._dequeue(item))
return;
handle.finishShutdown(req, 0);
});
});
return 0;
};
StreamWrap.prototype.doWrite = function doWrite(req, bufs) {
const self = this;
const handle = self._handle;
var pending = bufs.length;
// Queue the request to be able to cancel it
const item = self._enqueue('write', req);
self.stream.cork();
for (var n = 0; n < bufs.length; n++)
self.stream.write(bufs[n], done);
self.stream.uncork();
function done(err) {
if (!err && --pending !== 0)
return;
// Ensure that this is called once in case of error
pending = 0;
let errCode = 0;
if (err) {
const code = uv[`UV_${err.code}`];
errCode = (err.code && code) ? code : uv.UV_EPIPE;
}
// Ensure that write was dispatched
setImmediate(function() {
// Do not invoke callback twice
if (!self._dequeue(item))
return;
handle.doAfterWrite(req);
handle.finishWrite(req, errCode);
});
}
return 0;
};
function QueueItem(type, req) {
this.type = type;
this.req = req;
this.prev = this;
this.next = this;
}
StreamWrap.prototype._enqueue = function _enqueue(type, req) {
const item = new QueueItem(type, req);
if (this._list === null) {
this._list = item;
return item;
}
item.next = this._list.next;
item.prev = this._list;
item.next.prev = item;
item.prev.next = item;
return item;
};
StreamWrap.prototype._dequeue = function _dequeue(item) {
assert(item instanceof QueueItem);
var next = item.next;
var prev = item.prev;
if (next === null && prev === null)
return false;
item.next = null;
item.prev = null;
if (next === item) {
prev = null;
next = null;
} else {
prev.next = next;
next.prev = prev;
}
if (this._list === item)
this._list = next;
return true;
};
StreamWrap.prototype.doClose = function doClose(cb) {
const self = this;
const handle = self._handle;
setImmediate(function() {
while (self._list !== null) {
const item = self._list;
const req = item.req;
self._dequeue(item);
const errCode = uv.UV_ECANCELED;
if (item.type === 'write') {
handle.doAfterWrite(req);
handle.finishWrite(req, errCode);
} else if (item.type === 'shutdown') {
handle.finishShutdown(req, errCode);
}
}
// Should be already set by net.js
assert(self._handle === null);
cb();
});
};
|
