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<h1 class="title toc-ignore">Logging from R Packages</h1>



<p>In this vignette I suppose that you are already familiar with <a href="https://daroczig.github.io/logger/articles/customize_logger.html">Customizing the format and destination of log records</a> vignette, especially with the <a href="https://daroczig.github.io/logger/articles/customize_logger.html#log-namespaces">Log namespaces</a> section.</p>
<p>So that your R package’s users can suppress (or render with custom layout) the log messages triggered by your R package, it’s wise to record all those log messages in a custom namespace. By default, if you are calling the <code>?log_level</code> function family from an R package after importing from the <code>logger</code> package, then <code>logger</code> will try to auto-guess the calling R package name and use that as the default namespace, see eg:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(logger)</span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; </span></span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; Attaching package: &#39;logger&#39;</span></span>
<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; The following object is masked from &#39;package:log4r&#39;:</span></span>
<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; </span></span>
<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     logger</span></span>
<span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a>devtools<span class="sc">::</span><span class="fu">load_all</span>(<span class="fu">system.file</span>(<span class="st">&#39;demo-packages/logger-tester-package&#39;</span>, <span class="at">package =</span> <span class="st">&#39;logger&#39;</span>))</span>
<span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; ℹ Loading logger.tester</span></span>
<span id="cb1-9"><a href="#cb1-9" aria-hidden="true" tabindex="-1"></a><span class="fu">logger_tester_function</span>(INFO, <span class="st">&#39;hi from tester package&#39;</span>)</span></code></pre></div>
<p>But if auto-guessing is not your style, then feel free to set your custom namespace (eg the name of your package) in all <code>?log_info</code> etc function calls and let your users know about how to suppress / reformat / redirect your log messages via <code>?log_threshold</code>, <code>?log_layout</code>, <code>?log_appender</code>.</p>
<p>Please note that setting the formatter function via <code>?log_formatter</code> should not be left to the R package end-users, as the log message formatter is specific to your logging calls, so that should be decided by the R package author. Feel free to pick any formatter function (eg <code>glue</code>, <code>sprintf</code>, <code>paste</code> or something else), and set that via <code>?log_formatter</code> when your R package is loaded. All other parameters of your <code>logger</code> will inherit from the <code>global</code> namespace – set by your R package’s end user.</p>



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