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<h1 id="logging">Logging<a class="headerlink" href="#logging" title="Permanent link">&para;</a></h1>
<div class="admonition note">
<p class="admonition-title">Message type notice</p>
<p>
On this page all the messages will be just simple <code>String</code>, but you may pass any object as the message</p>
</div>
<p>As has been said in the <a href="setup.html">setup</a> section, this library contains next levels of logging with their default representations on each platform:</p>
<table>
<thead>
<tr>
<th align="right">Weight (by order)</th>
<th align="left">LogLevel name</th>
<th align="left">JS</th>
<th align="left">JVM Loggers</th>
<th align="left">Android</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right">0</td>
<td align="left">DEBUG</td>
<td align="left">console.log</td>
<td align="left">Level.FINEST</td>
<td align="left">Log.d</td>
</tr>
<tr>
<td align="right">1</td>
<td align="left">VERBOSE</td>
<td align="left">console.info</td>
<td align="left">Level.FINE</td>
<td align="left">Log.v</td>
</tr>
<tr>
<td align="right">2</td>
<td align="left">INFO</td>
<td align="left">console.info</td>
<td align="left">Level.INFO</td>
<td align="left">Log.i</td>
</tr>
<tr>
<td align="right">3</td>
<td align="left">WARNING</td>
<td align="left">console.warn</td>
<td align="left">Level.WARNING</td>
<td align="left">Log.w</td>
</tr>
<tr>
<td align="right">4</td>
<td align="left">ERROR</td>
<td align="left">console.error</td>
<td align="left">Level.SEVERE</td>
<td align="left">Log.e</td>
</tr>
<tr>
<td align="right">5</td>
<td align="left">ASSERT</td>
<td align="left">console.error</td>
<td align="left">Level.SEVERE</td>
<td align="left">Log.wtf</td>
</tr>
</tbody>
</table>
<p>Each of these levels have fullname and shortname shortcat extensions:</p>
<ul>
<li><code>KSLog.debug</code>/<code>KSLog.d</code>/<code>KSLog.dS</code></li>
<li><code>KSLog.verbose</code>/<code>KSLog.v</code>/<code>KSLog.vS</code></li>
<li><code>KSLog.info</code>/<code>KSLog.i</code>/<code>KSLog.iS</code></li>
<li><code>KSLog.warning</code>/<code>KSLog.w</code>/<code>KSLog.wS</code></li>
<li><code>KSLog.error</code>/<code>KSLog.e</code>/<code>KSLog.eS</code></li>
<li><code>KSLog.assert</code>/<code>KSLog.wtf</code>/<code>KSLog.wtfS</code></li>
</ul>
<p>And any of these shortcuts may accept one of several arguments combinations:</p>
<ul>
<li>Tag (Optional), Throwable (Optional), Message Builder (simple inline callback for lazy creating of log message). This type of arguments is duplicated with <code>S</code> suffix for <code>suspendable</code> messages creating, for example</li>
<li>Message, Throwable (Optional)</li>
<li>Tag, Message, Throwable (Optional)</li>
</ul>
<p>So, when you want to log some expected exception, there are three common ways to do it:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">logger</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">KSLog</span><span class="p">.</span><span class="na">default</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="c1">// with callback</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="n">logger</span><span class="p">.</span><span class="na">info</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">}</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="c1">// with suspendable callback</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="n">logger</span><span class="p">.</span><span class="na">infoS</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="n">withContext</span><span class="p">(</span><span class="n">Dispatchers</span><span class="p">.</span><span class="na">Default</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="p">}</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="c1">// Just with message</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="n">logger</span><span class="p">.</span><span class="na">info</span><span class="p">(</span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="c1">// With message and tag as strings</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="n">logger</span><span class="p">.</span><span class="na">info</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span></code></pre></div>
<p>Of course, any of this calls can be shortenned:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">logger</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">KSLog</span><span class="p">.</span><span class="na">default</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="c1">// with callback</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="n">logger</span><span class="p">.</span><span class="na">i</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="p">}</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="c1">// with suspendable callback</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="n">logger</span><span class="p">.</span><span class="na">iS</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="n">withContext</span><span class="p">(</span><span class="n">Dispatchers</span><span class="p">.</span><span class="na">Default</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="p">}</span>
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="c1">// Just with message</span>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="n">logger</span><span class="p">.</span><span class="na">i</span><span class="p">(</span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="c1">// With message and tag as strings</span>
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="n">logger</span><span class="p">.</span><span class="na">i</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span></code></pre></div>
<p>There is special shortcat - for base <code>performLog</code>. In that case the only change is that you will require to pass the <code>LogLevel</code> more obviously:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">logger</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">KSLog</span><span class="p">.</span><span class="na">default</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="c1">// with callback</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="n">logger</span><span class="p">.</span><span class="na">log</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="p">}</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="c1">// with suspendable callback</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="n">logger</span><span class="p">.</span><span class="na">logS</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="n">withContext</span><span class="p">(</span><span class="n">Dispatchers</span><span class="p">.</span><span class="na">Default</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="p">}</span>
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a>
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="c1">// Just with message</span>
</span><span id="__span-2-16"><a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="n">logger</span><span class="p">.</span><span class="na">log</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span><span id="__span-2-17"><a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a>
</span><span id="__span-2-18"><a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="c1">// With message and tag as strings</span>
</span><span id="__span-2-19"><a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="n">logger</span><span class="p">.</span><span class="na">log</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span></code></pre></div>
<p>OR</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">logger</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">KSLog</span><span class="p">.</span><span class="na">default</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="c1">// with callback</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="n">logger</span><span class="p">.</span><span class="na">l</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="p">}</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="c1">// with suspendable callback</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="n">logger</span><span class="p">.</span><span class="na">lS</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="n">withContext</span><span class="p">(</span><span class="n">Dispatchers</span><span class="p">.</span><span class="na">Default</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span>
</span><span id="__span-3-12"><a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-3-13"><a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="p">}</span>
</span><span id="__span-3-14"><a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a>
</span><span id="__span-3-15"><a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="c1">// Just with message</span>
</span><span id="__span-3-16"><a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="n">logger</span><span class="p">.</span><span class="na">l</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span><span id="__span-3-17"><a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a>
</span><span id="__span-3-18"><a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a><span class="c1">// With message and tag as strings</span>
</span><span id="__span-3-19"><a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="n">logger</span><span class="p">.</span><span class="na">l</span><span class="p">(</span><span class="n">LogLevel</span><span class="p">.</span><span class="na">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Some your message for this event&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">throwable</span><span class="p">)</span>
</span></code></pre></div>
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