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<h1 id="exceptions-handling">Exceptions handling<a class="headerlink" href="#exceptions-handling" title="Permanent link">&para;</a></h1>
<p>Unfortunatelly, exceptions handling in this library is a bit difficult in some places, but that have at least two reasons: flexibility and usability.</p>
<h2 id="in-place-handling">&ldquo;In place&rdquo; handling<a class="headerlink" href="#in-place-handling" title="Permanent link">&para;</a></h2>
<p>In case you know, where exceptions are happening, you may use several tools for exceptions catching:</p>
<ul>
<li>Catching with result</li>
<li>Catching with callback</li>
</ul>
<h3 id="catching-with-result">Catching with result<a class="headerlink" href="#catching-with-result" title="Permanent link">&para;</a></h3>
<p>If you prefer to receive <code>Result</code> objects instead of some weird callbacks, you may use the next syntax:</p>
<pre><code class="language-kotlin">safelyWithResult {
// do something
}.onSuccess { // will be called if everything is right
// handle success
}.onFailure { // will be called if something went wrong
// handle error
it.printStackTrace()
}.getOrThrow() // will return value or throw exception
</code></pre>
<h3 id="catching-with-callback">Catching with callback<a class="headerlink" href="#catching-with-callback" title="Permanent link">&para;</a></h3>
<p>Also there is more simple (in some cases) way to handle exceptions with callbacks:</p>
<pre><code class="language-kotlin">safely(
{
// handle error
it.printStackTrace()
null // return value
}
) {
// do something
}
</code></pre>
<h3 id="bonus-different-types-of-handling">Bonus: different types of handling<a class="headerlink" href="#bonus-different-types-of-handling" title="Permanent link">&para;</a></h3>
<p>There are two types of handling:</p>
<ul>
<li>Just safely - when you are using something to obviously retrieve value or throw exception. When handling callback has been skipped, it will throw exception by default. For example:</li>
</ul>
<pre><code class="language-kotlin">safely(
{
it.printStackTrace()
&quot;error&quot;
}
) {
error(&quot;Hi :)&quot;) // emulate exception throwing
&quot;ok&quot;
} // result will be with type String
</code></pre>
<ul>
<li>Safely without exceptions - almost the same as <code>safely</code>, but this type by default allow to return nullable value (when exception was thrown) instead of just throwing (as with <code>safely</code>):</li>
</ul>
<pre><code class="language-kotlin">safelyWithouExceptions {
// do something
} // will returns nullable result type
</code></pre>
<h2 id="global-exceptions-handling">Global exceptions handling<a class="headerlink" href="#global-exceptions-handling" title="Permanent link">&para;</a></h2>
<p>The most simple way to configure exceptions handling is to change <code>CoroutineContext</code> when you are creating your <code>CoroutineScope</code> for bot processing:</p>
<pre><code class="language-kotlin">val bot = telegramBot(&quot;TOKEN&quot;)
bot.buildBehaviour (
scope = scope,
defaultExceptionsHandler = {
it.printStackTrace()
}
) {
// ...
}
</code></pre>
<p>OR</p>
<pre><code class="language-kotlin">val bot = telegramBotWithBehaviour (
&quot;TOKEN&quot;,
scope = scope,
defaultExceptionsHandler = {
it.printStackTrace()
}
) {
// ...
}
</code></pre>
<p>Here we have used <code>ContextSafelyExceptionHandler</code> class. It will pass default handling of exceptions and will call the block in most cases when something inside of your bot logic has thrown exception.</p>
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