signalk-server
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An implementation of a [Signal K](http://signalk.org) server for boats.
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class="tsd-widget menu" id="tsd-toolbar-menu-trigger" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../../assets/icons.svg#icon-menu"></use></svg></a></div></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb" aria-label="Breadcrumb"><li><a href="../../Developing.html">Developing</a></li><li><a href="../Plugins.html">Plugins</a></li><li><a href="" aria-current="page">Weather Providers</a></li></ul></div><div class="tsd-panel tsd-typography"><h1 id="weather-providers" class="tsd-anchor-link">Weather Providers<a href="#weather-providers" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h1><p>The Signal K server <a href="../REST_APIs/Weather_API.html">Weather API</a> provides a common set of operations for retrieving meteorological data via a "provider plugin" to facilitate communication with a weather service provider.</p>
<p>A weather provider plugin is a Signal K server plugin that brokers communication with a weather provider.</p>
<hr>
<h2 id="weather-provider-interface" class="tsd-anchor-link">Weather Provider Interface<a href="#weather-provider-interface" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>For a plugin to be a weather provider it must implement the <a href="../../_signalk/server-api/WeatherProvider.html" class="tsd-kind-interface"><code>WeatherProvider</code></a> Interface which provides the Signal K server with methods to pass the details contained in API requests.</p>
<p><strong>A weather provider MUST return data as defined by the OpenAPI definition.</strong></p>
<div class="tsd-alert tsd-alert-note"><div class="tsd-alert-title"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16" aria-hidden="true"><use href="../../assets/icons.svg#icon-alertNote"></use></svg><span>Note</span></div><p>
Multiple weather providers can be registered with the Signal K server to enable meteorogical data retrieval from multiple sources.</p>
</div>
<h2 id="weather-provider-interface-methods" class="tsd-anchor-link">Weather Provider Interface Methods<a href="#weather-provider-interface-methods" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Weather API requests made to the Signal K server will result in the plugin's <a href="../../_signalk/server-api/WeatherProviderMethods.html" class="tsd-kind-interface"><code>WeatherProviderMethods</code></a> being called.</p>
<p>A weather provider plugin MUST implement ALL of the <a href="../../_signalk/server-api/WeatherProviderMethods.html" class="tsd-kind-interface"><code>WeatherProviderMethods</code></a>:</p>
<ul>
<li>
<p><a href="../../_signalk/server-api/WeatherProviderMethods.html#getobservations" class="tsd-kind-property"><code>getObservations(position, options)</code></a></p>
</li>
<li>
<p><a href="../../_signalk/server-api/WeatherProviderMethods.html#getforecasts" class="tsd-kind-property"><code>getForecasts(position, type, options)</code></a></p>
</li>
<li>
<p><a href="../../_signalk/server-api/WeatherProviderMethods.html#getwarnings" class="tsd-kind-property"><code>getWarnings(position)</code></a></p>
</li>
</ul>
<div class="tsd-alert tsd-alert-note"><div class="tsd-alert-title"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16" aria-hidden="true"><use href="../../assets/icons.svg#icon-alertNote"></use></svg><span>Note</span></div><p>
The Weather Provider is responsible for implementing the methods and returning data in the required format!</p>
</div>
<hr>
<h2 id="registering-a-weather-provider" class="tsd-anchor-link">Registering a Weather Provider<a href="#registering-a-weather-provider" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Now that the plugin has implemented the required interface and methods, it can be registered as a weather provider with the SignalK server.</p>
<p>The plugin registers itself as a weather provider by calling the server's <a href="../../_signalk/server-api/WeatherProviderRegistry.html#registerweatherprovider" class="tsd-kind-property"><code>registerWeatherProvider</code></a> function during startup.</p>
<p>Do this within the plugin <code>start()</code> method.</p>
<p><em>Example.</em></p>
<pre><code class="javascript"><span class="hl-1">import</span><span class="hl-0"> { WeatherProvider } </span><span class="hl-1">from</span><span class="hl-0"> </span><span class="hl-4">'@signalk/server-api'</span><br/><br/><span class="hl-2">module</span><span class="hl-0">.</span><span class="hl-2">exports</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> </span><span class="hl-1">function</span><span class="hl-0"> (</span><span class="hl-5">app</span><span class="hl-0">) {</span><br/><br/><span class="hl-0"> </span><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">weatherProvider</span><span class="hl-1">:</span><span class="hl-0"> </span><span class="hl-5">WeatherProvider</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> {</span><br/><span class="hl-0"> name: </span><span class="hl-4">'MyWeatherService'</span><span class="hl-0">,</span><br/><span class="hl-0"> methods: {</span><br/><span class="hl-0"> </span><span class="hl-8">getObservations</span><span class="hl-0">: (</span><br/><span class="hl-0"> </span><span class="hl-5">position</span><span class="hl-1">:</span><span class="hl-0"> </span><span class="hl-5">Position</span><span class="hl-0">,</span><br/><span class="hl-0"> </span><span class="hl-5">options</span><span class="hl-1">?:</span><span class="hl-0"> </span><span class="hl-5">WeatherReqParams</span><br/><span class="hl-0"> ) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-6">// fetch observation data from weather service</span><br/><span class="hl-0"> </span><span class="hl-1">return</span><span class="hl-0"> observations</span><br/><span class="hl-0"> },</span><br/><span class="hl-0"> </span><span class="hl-8">getForecasts</span><span class="hl-0">: (</span><br/><span class="hl-0"> </span><span class="hl-5">position</span><span class="hl-1">:</span><span class="hl-0"> </span><span class="hl-5">Position</span><span class="hl-0">,</span><br/><span class="hl-0"> </span><span class="hl-5">type</span><span class="hl-1">:</span><span class="hl-0"> </span><span class="hl-5">WeatherForecastType</span><span class="hl-0">,</span><br/><span class="hl-0"> </span><span class="hl-5">options</span><span class="hl-1">?:</span><span class="hl-0"> </span><span class="hl-5">WeatherReqParams</span><br/><span class="hl-0"> ) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-6">// fetch forecasts data from weather service</span><br/><span class="hl-0"> </span><span class="hl-1">return</span><span class="hl-0"> forecasts</span><br/><span class="hl-0"> },</span><br/><span class="hl-0"> </span><span class="hl-8">getWarnings</span><span class="hl-0">: () </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> </span><span class="hl-6">// Service does not provide weather warnings.</span><br/><span class="hl-0"> </span><span class="hl-1">throw</span><span class="hl-0"> </span><span class="hl-1">new</span><span class="hl-0"> </span><span class="hl-8">Error</span><span class="hl-0">(</span><span class="hl-4">'Not supported!'</span><span class="hl-0">)</span><br/><span class="hl-0"> }</span><br/><span class="hl-0"> }</span><br/><span class="hl-0"> }</span><br/><br/><span class="hl-0"> </span><span class="hl-1">const</span><span class="hl-0"> </span><span class="hl-2">plugin</span><span class="hl-0"> </span><span class="hl-1">=</span><span class="hl-0"> {</span><br/><span class="hl-0"> id: </span><span class="hl-4">'mypluginid'</span><span class="hl-0">,</span><br/><span class="hl-0"> name: </span><span class="hl-4">'My Weather Provider plugin'</span><br/><span class="hl-0"> start: (</span><span class="hl-5">settings</span><span class="hl-1">:</span><span class="hl-0"> </span><span class="hl-2">any</span><span class="hl-0">) </span><span class="hl-1">=></span><span class="hl-0"> {</span><br/><span class="hl-0"> app.</span><span class="hl-8">registerWeatherProvider</span><span class="hl-0">(weatherProvider)</span><br/><span class="hl-0"> }</span><br/><span class="hl-0"> }</span><br/><br/><span class="hl-0"> </span><span class="hl-1">return</span><span class="hl-0"> plugin</span>
</code><button type="button">Copy</button></pre>
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