/
combineloggers.html
334 lines (324 loc) · 17.6 KB
/
combineloggers.html
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
330
331
332
333
334
<!DOCTYPE html>
<html lang="en">
<head>
<title>CombineLoggers Reference</title>
<link rel="stylesheet" type="text/css" href="css/jazzy.css" />
<link rel="stylesheet" type="text/css" href="css/highlight.css" />
<meta charset='utf-8'>
<script src="js/jquery.min.js" defer></script>
<script src="js/jazzy.js" defer></script>
<script src="js/lunr.min.js" defer></script>
<script src="js/typeahead.jquery.js" defer></script>
<script src="js/jazzy.search.js" defer></script>
</head>
<body>
<a title="CombineLoggers Reference"></a>
<header>
<div class="content-wrapper">
<p><a href="index.html">CocoaLumberjack 3.7.0 Docs</a> (64% documented)</p>
<p class="header-right"><a href="https://github.com/CocoaLumberjack/CocoaLumberjack"><img src="img/gh.png"/>View on GitHub</a></p>
<p class="header-right">
<form role="search" action="search.json">
<input type="text" placeholder="Search documentation" data-typeahead>
</form>
</p>
</div>
</header>
<div class="content-wrapper">
<p id="breadcrumbs">
<a href="index.html">CocoaLumberjack Reference</a>
<img id="carat" src="img/carat.png" />
CombineLoggers Reference
</p>
</div>
<div class="content-wrapper">
<nav class="sidebar">
<ul class="nav-groups">
<li class="nav-group-name">
<a href="Guides.html">Guides</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="arc.html">ARC</a>
</li>
<li class="nav-group-task">
<a href="appcode-support.html">AppCode-support</a>
</li>
<li class="nav-group-task">
<a href="architecture.html">Architecture</a>
</li>
<li class="nav-group-task">
<a href="combineloggers.html">CombineLoggers</a>
</li>
<li class="nav-group-task">
<a href="customcontext.html">CustomContext</a>
</li>
<li class="nav-group-task">
<a href="customformatters.html">CustomFormatters</a>
</li>
<li class="nav-group-task">
<a href="customloglevels.html">CustomLogLevels</a>
</li>
<li class="nav-group-task">
<a href="customloggers.html">CustomLoggers</a>
</li>
<li class="nav-group-task">
<a href="dynamicloglevels.html">DynamicLogLevels</a>
</li>
<li class="nav-group-task">
<a href="faq.html">FAQ</a>
</li>
<li class="nav-group-task">
<a href="finegrainedlogging.html">FineGrainedLogging</a>
</li>
<li class="nav-group-task">
<a href="gettingstarted.html">GettingStarted</a>
</li>
<li class="nav-group-task">
<a href="logfilemanagement.html">LogFileManagement</a>
</li>
<li class="nav-group-task">
<a href="perloggerloglevels.html">PerLoggerLogLevels</a>
</li>
<li class="nav-group-task">
<a href="peruserloglevels.html">PerUserLogLevels</a>
</li>
<li class="nav-group-task">
<a href="performance.html">Performance</a>
</li>
<li class="nav-group-task">
<a href="problemsolution.html">ProblemSolution</a>
</li>
<li class="nav-group-task">
<a href="readme.html">README</a>
</li>
<li class="nav-group-task">
<a href="xcodecolors.html">XcodeColors</a>
</li>
<li class="nav-group-task">
<a href="xcodetricks.html">XcodeTricks</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Classes.html">Classes</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Classes/CLIColor.html">CLIColor</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDASLLogCapture.html">DDASLLogCapture</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDASLLogger.html">DDASLLogger</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDAbstractDatabaseLogger.html">DDAbstractDatabaseLogger</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDAbstractLogger.html">DDAbstractLogger</a>
</li>
<li class="nav-group-task">
<a href="Classes.html#/c:objc(cs)DDAtomicCounter">DDAtomicCounter</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDContextBlacklistFilterLogFormatter.html">DDContextBlacklistFilterLogFormatter</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDContextWhitelistFilterLogFormatter.html">DDContextWhitelistFilterLogFormatter</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDDispatchQueueLogFormatter.html">DDDispatchQueueLogFormatter</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDFileLogger.html">DDFileLogger</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDLog.html">DDLog</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDLogFileFormatterDefault.html">DDLogFileFormatterDefault</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDLogFileInfo.html">DDLogFileInfo</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDLogFileManagerDefault.html">DDLogFileManagerDefault</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDLogMessage.html">DDLogMessage</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDLoggerInformation.html">DDLoggerInformation</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDMultiFormatter.html">DDMultiFormatter</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDOSLogger.html">DDOSLogger</a>
</li>
<li class="nav-group-task">
<a href="Classes/DDTTYLogger.html">DDTTYLogger</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Constants.html">Constants</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Constants.html#/c:@CocoaLumberjackVersionNumber">CocoaLumberjackVersionNumber</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@CocoaLumberjackVersionString">CocoaLumberjackVersionString</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDLoggerNameASL">DDLoggerNameASL</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDLoggerNameFile">DDLoggerNameFile</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDLoggerNameOS">DDLoggerNameOS</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDLoggerNameTTY">DDLoggerNameTTY</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDQualityOfServiceBackground">DDQualityOfServiceBackground</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDQualityOfServiceDefault">DDQualityOfServiceDefault</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDQualityOfServiceUnspecified">DDQualityOfServiceUnspecified</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDQualityOfServiceUserInitiated">DDQualityOfServiceUserInitiated</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDQualityOfServiceUserInteractive">DDQualityOfServiceUserInteractive</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@DDQualityOfServiceUtility">DDQualityOfServiceUtility</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@kDDASLDDLogValue">kDDASLDDLogValue</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@kDDASLKeyDDLog">kDDASLKeyDDLog</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@kDDDefaultLogFilesDiskQuota">kDDDefaultLogFilesDiskQuota</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@kDDDefaultLogMaxFileSize">kDDDefaultLogMaxFileSize</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@kDDDefaultLogMaxNumLogFiles">kDDDefaultLogMaxNumLogFiles</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@kDDDefaultLogRollingFrequency">kDDDefaultLogRollingFrequency</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Enums.html">Enumerations</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Enums/DDDispatchQueueLogFormatterMode.html">DDDispatchQueueLogFormatterMode</a>
</li>
<li class="nav-group-task">
<a href="Enums/DDLogFlag.html">DDLogFlag</a>
</li>
<li class="nav-group-task">
<a href="Enums/DDLogLevel.html">DDLogLevel</a>
</li>
<li class="nav-group-task">
<a href="Enums/DDLogMessageOptions.html">DDLogMessageOptions</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Protocols.html">Protocols</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Protocols/DDAtomicCountable.html">DDAtomicCountable</a>
</li>
<li class="nav-group-task">
<a href="Protocols/DDLogFileManager.html">DDLogFileManager</a>
</li>
<li class="nav-group-task">
<a href="Protocols/DDLogFormatter.html">DDLogFormatter</a>
</li>
<li class="nav-group-task">
<a href="Protocols/DDLogger.html">DDLogger</a>
</li>
<li class="nav-group-task">
<a href="Protocols/DDRegisteredDynamicLogging.html">DDRegisteredDynamicLogging</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Type%20Definitions.html">Type Definitions</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:DDTTYLogger.h@T@DDColor">DDColor</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:DDLoggerNames.h@T@DDLoggerName">DDLoggerName</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:DDDispatchQueueLogFormatter.h@T@DDQualityOfServiceName">DDQualityOfServiceName</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Functions.html">Functions</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Functions.html#/c:@F@DDExtractFileNameWithoutExtension">DDExtractFileNameWithoutExtension</a>
</li>
<li class="nav-group-task">
<a href="Functions.html#/c:DDTTYLogger.h@F@DDMakeColor">DDMakeColor</a>
</li>
</ul>
</li>
</ul>
</nav>
<article class="main-content">
<section>
<section class="section">
<p>How to write your own custom logger using Combine.</p>
<h3 id='introduction' class='heading'>Introduction</h3>
<p>Loggers allow you to direct log messages wherever you want. <code>DDLog.messagePublisher()</code> wraps the API with a Combine publisher. Allowing you to use common Operators to transform these messages to your needs.</p>
<p>For general information about loggers, see the <a href="Architecture.md">architecture</a> page.</p>
<h3 id='publisher' class='heading'>Publisher</h3>
<p><code>DDLog.messagePublisher()</code> returns <code>MessagePublisher</code>, which will never stop sending <code><a href="Classes/DDLogMessage.html">DDLogMessage</a></code>s while there is an active subscriber and doesn’t emit errors. Note that it’ll create a <code><a href="Protocols/DDLogger.html">DDLogger</a></code> for each subscription unless you use the <code>share()</code> operator.</p>
<h3 id='example' class='heading'>Example</h3>
<p>Here is an example of how you could use it display the last 1000 message in a log viewer.</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">messages</span> <span class="o">=</span> <span class="p">[</span><span class="kt">String</span><span class="p">]()</span>
<span class="kd">private</span> <span class="k">var</span> <span class="nv">subscriptions</span> <span class="o">=</span> <span class="kt">Set</span><span class="o"><</span><span class="kt">AnyCancellable</span><span class="o">></span><span class="p">()</span>
<span class="kd">func</span> <span class="nf">setup</span><span class="p">()</span> <span class="p">{</span>
<span class="kt">DDLog</span><span class="o">.</span><span class="n">sharedInstance</span><span class="o">.</span><span class="nf">messagePublisher</span><span class="p">()</span> <span class="c1">//messagePublisher emits `DDLogMessage`</span>
<span class="o">.</span><span class="nf">map</span><span class="p">(</span><span class="err">\</span><span class="o">.</span><span class="n">message</span><span class="p">)</span> <span class="c1">//Emits `String`. You could do the formating here if you wanted.</span>
<span class="o">.</span><span class="nf">scan</span><span class="p">([],</span> <span class="p">{</span> <span class="p">(</span><span class="n">messages</span><span class="p">,</span> <span class="n">newMessage</span><span class="p">)</span> <span class="k">in</span>
<span class="k">var</span> <span class="nv">messages</span> <span class="o">=</span> <span class="n">messages</span>
<span class="n">messages</span><span class="o">.</span><span class="nf">insert</span><span class="p">(</span><span class="n">newMessage</span><span class="p">,</span> <span class="nv">at</span><span class="p">:</span> <span class="mi">0</span><span class="p">)</span>
<span class="k">return</span> <span class="kt">Array</span><span class="p">(</span><span class="n">messages</span><span class="o">.</span><span class="nf">prefix</span><span class="p">(</span><span class="mi">1000</span><span class="p">))</span>
<span class="p">})</span> <span class="c1">//Emits `[String]`. Up to 1000 messages, most recent message is first.</span>
<span class="o">.</span><span class="nf">receive</span><span class="p">(</span><span class="nv">on</span><span class="p">:</span> <span class="kt">DispatchQueue</span><span class="o">.</span><span class="n">main</span><span class="p">)</span> <span class="c1">//Emits `[String]` on Main Queue</span>
<span class="o">.</span><span class="nf">sink</span><span class="p">(</span><span class="nv">receiveValue</span><span class="p">:</span> <span class="p">{</span> <span class="p">[</span><span class="k">weak</span> <span class="k">self</span><span class="p">]</span> <span class="k">self</span><span class="p">?</span><span class="o">.</span><span class="n">messages</span> <span class="o">=</span> <span class="nv">$0</span> <span class="p">})</span> <span class="c1">//Sets `[String]` to local storage avoiding retain cycle.</span>
<span class="o">.</span><span class="nf">store</span><span class="p">(</span><span class="nv">in</span><span class="p">:</span> <span class="o">&</span><span class="n">subscriptions</span><span class="p">)</span> <span class="c1">//stores the subscription or it'll stop emitting events right away</span>
<span class="p">}</span>
</code></pre>
<p>You could add different operators to write the messages to disk, or to forward the messages to another API. </p>
</section>
</section>
<section id="footer">
<p>© 2020 <a class="link" href="https://github.com/CocoaLumberjack/CocoaLumberjack" target="_blank" rel="external">CocoaLumberjack</a>. All rights reserved. (Last updated: 2020-11-21)</p>
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.13.6</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external">Realm</a> project.</p>
</section>
</article>
</div>
</body>
</div>
</html>