vapor-docs/build/1.5/guide/droplet.html

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<h1>Vapor <em>Docs</em></h1>
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<h3>Guide</h3>
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Droplet
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Folder Structure
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Route Parameters
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1.5
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2.0
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3.0-beta
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<a href="https://github.com/vapor/documentation/blob/master/CONTRIBUTING.md" class="edit">✎ Edit on GitHub</a>
<h1 id="droplet">Droplet</h1>
<p>The <code>Droplet</code> is a service container that gives you access to many of Vapor's facilities. It is responsible for registering routes, starting the server, appending middleware, and more.</p>
<h2 id="initialization">Initialization</h2>
<p>As you have probably already seen, the only thing required to create an instance of <code>Droplet</code> is to import Vapor.</p>
<pre><code class="language-swift">import Vapor
let drop = Droplet()
// your magic here
drop.run()</code></pre>
<p>Creation of the <code>Droplet</code> normally happens in the <code>main.swift</code> file.</p>
<h2 id="environment">Environment</h2>
<p>The <code>environment</code> property contains the current environment your application is running in. Usually development, testing, or production.</p>
<pre><code class="language-swift">if drop.environment == .production {
...
}</code></pre>
<p>The environment affects <a href="config.html">Config</a> and <a href="log.html">Logging</a>. The environment is <code>development</code> by default. To change it, pass the <code>--env=</code> flag as an argument.</p>
<pre><code class="language-sh">vapor run serve --env=production</code></pre>
<p>If you are in Xcode, you can pass arguments through the scheme editor.</p>
<blockquote>
<p>Note: Debug logs can reduce the number of requests your application can handle per second. Enabling the production environment can improve performance.</p>
</blockquote>
<h2 id="working-directory">Working Directory</h2>
<p>The <code>workDir</code> property contains a path to the current working directory of the application relative to where it was started. By default, this property assumes you started the Droplet from its root directory.</p>
<pre><code class="language-swift">drop.workDir // "/var/www/my-project/"</code></pre>
<p>You can override the working directory through the <code>Droplet</code>'s initializer, or by passing the <code>--workdir</code> argument.</p>
<pre><code class="language-sh">vapor run serve --workdir="/var/www/my-project"</code></pre>
<h2 id="modifying-properties">Modifying Properties</h2>
<p>The <code>Droplet</code>'s properties can be changed programmatically or through configuration.</p>
<h3 id="programmatic">Programmatic</h3>
<p>Properties on the <code>Droplet</code> can be changed after it is initialized.</p>
<pre><code class="language-swift">let drop = Droplet()
drop.server = MyServerType.self</code></pre>
<p>Here the type of server the <code>Droplet</code> uses is changed to a custom type. When the <code>Droplet</code> is run, this custom server type will be booted instead of the default server.</p>
<h3 id="configurable">Configurable</h3>
<p>If you want to modify a property of the <code>Droplet</code> only in certain cases, you can use <code>addConfigurable</code>. Say for example you want to email error logs to yourself in production, but you don't want to spam your inbox while developing.</p>
<pre><code class="language-swift">let drop = Droplet()
drop.addConfigurable(log: MyEmailLogger.self, name: "email")</code></pre>
<p>The <code>Droplet</code> will continue to use the default logger until you modify the <code>Config/droplet.json</code> file to point to your email logger. If this is done in <code>Config/production/droplet.json</code>, then your logger will only be used in production.</p>
<pre><code class="language-json">{
"log": "email"
}</code></pre>
<h2 id="initialization-1">Initialization</h2>
<p>The <code>Droplet</code> init method is fairly simple since most properties are variable and can be changed after initialization.</p>
<p>Most plugins for Vapor come with a <a href="provider.html">Provider</a>, these take care of configuration details for you.</p>
<pre><code class="language-swift">Droplet(
arguments: [String]?,
workDir workDirProvided: String?,
config configProvided: Config?,
localization localizationProvided: Localization?,
)</code></pre>
<blockquote>
<p>Note: Remember that the Droplet's properties are initialized with usable defaults. This means that if you change a property, you must be sure to change it <em>before</em> other parts of your code use it. Otherwise, you may end up with confusing results as the defaults are used sometimes, and your overrides are used other times.</p>
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