dropbox/nodejs.html at master · gravitywp/dropbox · GitHub

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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Nodejs read note</title>
<!-- 2016-08-20 Sat 22:00 -->
<meta  http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta  name="generator" content="Org-mode" />
<meta  name="author" content="guozhen" />
<style type="text/css">
 <!--/*--><![CDATA[/*><!--*/
  .title  { text-align: center; }
  .todo   { font-family: monospace; color: red; }
  .done   { color: green; }
  .tag    { background-color: #eee; font-family: monospace;
            padding: 2px; font-size: 80%; font-weight: normal; }
  .timestamp { color: #bebebe; }
  .timestamp-kwd { color: #5f9ea0; }
  .right  { margin-left: auto; margin-right: 0px;  text-align: right; }
  .left   { margin-left: 0px;  margin-right: auto; text-align: left; }
  .center { margin-left: auto; margin-right: auto; text-align: center; }
  .underline { text-decoration: underline; }
  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
  p.verse { margin-left: 3%; }
  pre {
    border: 1px solid #ccc;
    box-shadow: 3px 3px 3px #eee;
    padding: 8pt;
    font-family: monospace;
    overflow: auto;
    margin: 1.2em;
  }
  pre.src {
    position: relative;
    overflow: visible;
    padding-top: 1.2em;
  }
  pre.src:before {
    display: none;
    position: absolute;
    background-color: white;
    top: -10px;
    right: 10px;
    padding: 3px;
    border: 1px solid black;
  }
  pre.src:hover:before { display: inline;}
  pre.src-sh:before    { content: 'sh'; }
  pre.src-bash:before  { content: 'sh'; }
  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
  pre.src-R:before     { content: 'R'; }
  pre.src-perl:before  { content: 'Perl'; }
  pre.src-java:before  { content: 'Java'; }
  pre.src-sql:before   { content: 'SQL'; }

  table { border-collapse:collapse; }
  caption.t-above { caption-side: top; }
  caption.t-bottom { caption-side: bottom; }
  td, th { vertical-align:top;  }
  th.right  { text-align: center;  }
  th.left   { text-align: center;   }
  th.center { text-align: center; }
  td.right  { text-align: right;  }
  td.left   { text-align: left;   }
  td.center { text-align: center; }
  dt { font-weight: bold; }
  .footpara:nth-child(2) { display: inline; }
  .footpara { display: block; }
  .footdef  { margin-bottom: 1em; }
  .figure { padding: 1em; }
  .figure p { text-align: center; }
  .inlinetask {
    padding: 10px;
    border: 2px solid gray;
    margin: 10px;
    background: #ffffcc;
  }
  #org-div-home-and-up
   { text-align: right; font-size: 70%; white-space: nowrap; }
  textarea { overflow-x: auto; }
  .linenr { font-size: smaller }
  .code-highlighted { background-color: #ffff00; }
  .org-info-js_info-navigation { border-style: none; }
  #org-info-js_console-label
    { font-size: 10px; font-weight: bold; white-space: nowrap; }
  .org-info-js_search-highlight
    { background-color: #ffff00; color: #000000; font-weight: bold; }
  /*]]>*/-->
</style>
<script type="text/javascript">
/*
@licstart  The following is the entire license notice for the
JavaScript code in this tag.

Copyright (C) 2012-2013 Free Software Foundation, Inc.

The JavaScript code in this tag is free software: you can
redistribute it and/or modify it under the terms of the GNU
General Public License (GNU GPL) as published by the Free Software
Foundation, either version 3 of the License, or (at your option)
any later version.  The code is distributed WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.

As additional permission under GNU GPL version 3 section 7, you
may distribute non-source (e.g., minimized or compacted) forms of
that code without the copy of the GNU GPL normally required by
section 4, provided you include this license notice and a URL
through which recipients can access the Corresponding Source.


@licend  The above is the entire license notice
for the JavaScript code in this tag.
*/
<!--/*--><![CDATA[/*><!--*/
 function CodeHighlightOn(elem, id)
 {
   var target = document.getElementById(id);
   if(null != target) {
     elem.cacheClassElem = elem.className;
     elem.cacheClassTarget = target.className;
     target.className = "code-highlighted";
     elem.className   = "code-highlighted";
   }
 }
 function CodeHighlightOff(elem, id)
 {
   var target = document.getElementById(id);
   if(elem.cacheClassElem)
     elem.className = elem.cacheClassElem;
   if(elem.cacheClassTarget)
     target.className = elem.cacheClassTarget;
 }
/*]]>*///-->
</script>
</head>
<body>
<div id="content">
<h1 class="title">Nodejs read note</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#sec-1">1. nodejs The Definitive Guide</a>
<ul>
<li><a href="#sec-1-1">1.1. Basic Knowledge</a></li>
<li><a href="#sec-1-2">1.2. Buffer</a></li>
<li><a href="#sec-1-3">1.3. link</a></li>
<li><a href="#sec-1-4">1.4. stream</a></li>
<li><a href="#sec-1-5">1.5. tcp</a></li>
<li><a href="#sec-1-6">1.6. http</a></li>
<li><a href="#sec-1-7">1.7. process</a></li>
<li><a href="#sec-1-8">1.8. child<sub>process</sub></a></li>
<li><a href="#sec-1-9">1.9. figure out</a></li>
</ul>
</li>
<li><a href="#sec-2">2. Node.js in Action</a>
<ul>
<li><a href="#sec-2-1">2.1. figure out</a>
<ul>
<li><a href="#sec-2-1-1">2.1.1. <span class="todo TODO">TODO</span> bcrypt random slat</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-1" class="outline-2">
<h2 id="sec-1"><span class="section-number-2">1</span> nodejs The Definitive Guide</h2>
<div class="outline-text-2" id="text-1">
</div><div id="outline-container-sec-1-1" class="outline-3">
<h3 id="sec-1-1"><span class="section-number-3">1.1</span> Basic Knowledge</h3>
<div class="outline-text-3" id="text-1-1">
<ol class="org-ol">
<li>console.time('small loop') console.timeEnd('small loop') 计算一段代码执行时间.
</li>
</ol>
<p>
vvv2. conosle.trace(label) 将当前栈信息作为标准错误信息输出
</p>
<ol class="org-ol">
<li>console.assert()
</li>
<li>global 是nodejs 运行环境中的全局对象
</li>
<li>setInterval or setTimeout  (cb, ms, [arg], [&#x2026;]) 第三个参数开始为需向回调传递的参数
</li>
<li>对于timer对象有 unref 暂时取消调用  ref则恢复调用
</li>
<li>require.resolve('./module') 用来获取某个模块文件的绝对路径 (不回加载模块)
</li>
<li>require.cache[require.resolve('./module') 获取缓存模块
</li>
<li>_<sub>filename</sub> _<sub>dirname</sub> 当前文件的完整路径 or 所在文件夹
</li>
<li>nodejs模块中事件处理 继承
</li>
</ol>
</div>
</div>

<div id="outline-container-sec-1-2" class="outline-3">
<h3 id="sec-1-2"><span class="section-number-3">1.2</span> Buffer</h3>
<div class="outline-text-3" id="text-1-2">
<ol class="org-ol">
<li>new Buffer(size) (字节)
</li>
<li>String 类型不可变 Buffer类型可变 slice 对string 操作是复制 对 Buffer 是共享
</li>
<li>将buffer 内容转换为字符串使用toString() or StringDeocoder对象
</li>
</ol>
</div>
</div>

<div id="outline-container-sec-1-3" class="outline-3">
<h3 id="sec-1-3"><span class="section-number-3">1.3</span> link</h3>
<div class="outline-text-3" id="text-1-3">
<ol class="org-ol">
<li>hard link: a hard link is a directory entry that associates a name with a file on a file system , Creating a hard link has the effect of giving one file multiple namesjust.
</li>
<li>symbolic link: a symbolic link (also symlink or soft link) is the nickname for any file that contains a reference to another file or directory in the form of an absolute or relative path and that affects pathname resolution.
</li>
</ol>
</div>
</div>

<div id="outline-container-sec-1-4" class="outline-3">
<h3 id="sec-1-4"><span class="section-number-3">1.4</span> stream</h3>
<div class="outline-text-3" id="text-1-4">
<ol class="org-ol">
<li>following mode
</li>
<li>following mode
</li>
</ol>
</div>
</div>

<div id="outline-container-sec-1-5" class="outline-3">
<h3 id="sec-1-5"><span class="section-number-3">1.5</span> tcp</h3>
<div class="outline-text-3" id="text-1-5">
<ol class="org-ol">
<li>options: allowHalfOpen when TCP server accpet FIN package don't sned FIN back. 服务器可以继续向客服端发送数据,但不会接受客户端的数据,需要end()来结束socket.
</li>
<li>当在一个慢速网络环境中需要发送大量时，TCP会将这些数据放在nodejs的缓冲队列,而非操作系统的tcp缓冲区。
</li>
<li>socket 是对tcp/ip协议的封装抽象的编程接口,方便程序员使用tcp/ip协议栈
</li>
</ol>
</div>
</div>
<div id="outline-container-sec-1-6" class="outline-3">
<h3 id="sec-1-6"><span class="section-number-3">1.6</span> http</h3>
<div class="outline-text-3" id="text-1-6">
<ol class="org-ol">
<li>when invoke http.ServerResponse's write or wiriteHead method ,send the header right away.
</li>
<li></li>
</ol>
</div>
</div>
<div id="outline-container-sec-1-7" class="outline-3">
<h3 id="sec-1-7"><span class="section-number-3">1.7</span> process</h3>
<div class="outline-text-3" id="text-1-7">
<ol class="org-ol">
<li>nextTick is invoked before setTimeout(fn, 0).
</li>
<li>nextTick 可以用于讲函数推迟到下一个异步代码回调调用前调用
</li>
</ol>
</div>
</div>
<div id="outline-container-sec-1-8" class="outline-3">
<h3 id="sec-1-8"><span class="section-number-3">1.8</span> child<sub>process</sub></h3>
<div class="outline-text-3" id="text-1-8">
<ol class="org-ol">
<li><a href="http://stackoverflow.com/questions/17861362/node-js-child-process-difference-between-spawn-fork">difference between Spawn &amp; fork</a>
</li>
</ol>
</div>
</div>

<div id="outline-container-sec-1-9" class="outline-3">
<h3 id="sec-1-9"><span class="section-number-3">1.9</span> figure out</h3>
<div class="outline-text-3" id="text-1-9">
<ol class="org-ol">
<li>nodejs Eventloop
</li>
<li>when exports as class need use module.exports
</li>
<li>buufer read/write numberx
</li>
<li>file descriptor
</li>
<li>telnet protocol
</li>
<li>http 1.1 support chunked
</li>
<li>public key and private key
</li>
<li></li>
</ol>
</div>
</div>
</div>

<div id="outline-container-sec-2" class="outline-2">
<h2 id="sec-2"><span class="section-number-2">2</span> Node.js in Action</h2>
<div class="outline-text-2" id="text-2">
</div><div id="outline-container-sec-2-1" class="outline-3">
<h3 id="sec-2-1"><span class="section-number-3">2.1</span> figure out</h3>
<div class="outline-text-3" id="text-2-1">
</div><div id="outline-container-sec-2-1-1" class="outline-4">
<h4 id="sec-2-1-1"><span class="section-number-4">2.1.1</span> <span class="todo TODO">TODO</span> bcrypt random slat</h4>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: guozhen</p>
<p class="date">Created: 2016-08-20 Sat 22:00</p>
<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 25.1.50.1 (<a href="http://orgmode.org">Org</a> mode 8.2.10)</p>
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
</html>