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milessabin committed Jun 19, 2024
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24 changes: 9 additions & 15 deletions tutorial/db-backed-model.html
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Expand Up @@ -426,25 +426,19 @@ <h2 id="the-query-compiler-and-elaborator" class="section"><a class="anchor-link
<h2 id="putting-it-all-together" class="section"><a class="anchor-link left" href="#putting-it-all-together"><i class="icofont-laika link">&#xef71;</i></a>Putting it all together</h2>
<p>To expose the GraphQL API via http4s we will use the <code>GraphQLService</code> and <code>DemoServer</code> from the <a href="in-memory-model.html#the-service">in-memory
example</a>.</p>
<p>The <code>run</code> method starts the dockerized PostgreSQL database, creates the database schema, writes initial data and
exposes the GraphQL API for both the in-memory and the db-backend models,</p>
<pre><code class="nohighlight"><span class="keyword">object</span><span> </span><span class="type-name">Main</span><span> </span><span class="keyword">extends</span><span> </span><span class="type-name">IOApp</span><span> {
<p>The <code>run</code> method starts the dockerized PostgreSQL database, and exposes the GraphQL API for both the in-memory and the
db-backend models,</p>
<pre class="keep-together pdf epub"><code class="nohighlight"><span class="keyword">object</span><span> </span><span class="type-name">Main</span><span> </span><span class="keyword">extends</span><span> </span><span class="type-name">IOApp</span><span> {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">run</span><span>(</span><span class="identifier">args</span><span>: </span><span class="type-name">List</span><span>[</span><span class="type-name">String</span><span>]): </span><span class="type-name">IO</span><span>[</span><span class="type-name">ExitCode</span><span>] = {
</span><span class="type-name">DBSetup</span><span>.</span><span class="identifier">run</span><span> { </span><span class="identifier">xa</span><span> =&gt;
</span><span class="keyword">val</span><span> </span><span class="identifier">worldGraphQLRoutes</span><span> = </span><span class="type-name">GraphQLService</span><span>.</span><span class="identifier">routes</span><span>(
</span><span class="string-literal">&quot;world&quot;</span><span>,
</span><span class="type-name">GraphQLService</span><span>.</span><span class="identifier">fromMapping</span><span>(</span><span class="type-name">WorldMapping</span><span>.</span><span class="identifier">mkMappingFromTransactor</span><span>(</span><span class="identifier">xa</span><span>))
)
</span><span class="keyword">val</span><span> </span><span class="identifier">starWarsGraphQLRoutes</span><span> = </span><span class="type-name">GraphQLService</span><span>.</span><span class="identifier">routes</span><span>[</span><span class="type-name">IO</span><span>](
</span><span class="string-literal">&quot;starwars&quot;</span><span>,
</span><span class="type-name">GraphQLService</span><span>.</span><span class="identifier">fromMapping</span><span>(</span><span class="keyword">new</span><span> </span><span class="type-name">StarWarsMapping</span><span>[</span><span class="type-name">IO</span><span>] </span><span class="keyword">with</span><span> </span><span class="type-name">StarWarsData</span><span>[</span><span class="type-name">IO</span><span>])
)
</span><span class="type-name">DemoServer</span><span>.</span><span class="identifier">resource</span><span>(</span><span class="identifier">worldGraphQLRoutes</span><span> &lt;+&gt; </span><span class="identifier">starWarsGraphQLRoutes</span><span>)
}
(</span><span class="keyword">for</span><span> {
</span><span class="identifier">starWarsRoutes</span><span> &lt;- </span><span class="type-name">StarWarsMapping</span><span>[</span><span class="type-name">IO</span><span>].</span><span class="identifier">map</span><span>(</span><span class="identifier">mkRoutes</span><span>(</span><span class="string-literal">&quot;starwars&quot;</span><span>))
</span><span class="identifier">worldRoutes</span><span> &lt;- </span><span class="type-name">WorldMapping</span><span>[</span><span class="type-name">IO</span><span>].</span><span class="identifier">map</span><span>(</span><span class="identifier">mkRoutes</span><span>(</span><span class="string-literal">&quot;world&quot;</span><span>))
</span><span class="identifier">_</span><span> &lt;- </span><span class="identifier">mkServer</span><span>(</span><span class="identifier">starWarsRoutes</span><span> &lt;+&gt; </span><span class="identifier">worldRoutes</span><span>)
} </span><span class="keyword">yield</span><span> ()).</span><span class="identifier">useForever</span><span>
}
}</span></code></pre>
<pre><code class="nohighlight"><span class="keyword">object</span><span> </span><span class="type-name">DemoServer</span><span> {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">resource</span><span>(</span><span class="identifier">graphQLRoutes</span><span>: </span><span class="type-name">HttpRoutes</span><span>[</span><span class="type-name">IO</span><span>]): </span><span class="type-name">Resource</span><span>[</span><span class="type-name">IO</span><span>, </span><span class="type-name">Unit</span><span>] = {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">mkServer</span><span>(</span><span class="identifier">graphQLRoutes</span><span>: </span><span class="type-name">HttpRoutes</span><span>[</span><span class="type-name">IO</span><span>]): </span><span class="type-name">Resource</span><span>[</span><span class="type-name">IO</span><span>, </span><span class="type-name">Unit</span><span>] = {
</span><span class="keyword">val</span><span> </span><span class="identifier">httpApp0</span><span> = (
</span><span class="comment">// Routes for static resources, i.e. GraphQL Playground
</span><span> </span><span class="identifier">resourceServiceBuilder</span><span>[</span><span class="type-name">IO</span><span>](</span><span class="string-literal">&quot;/assets&quot;</span><span>).</span><span class="identifier">toRoutes</span><span> &lt;+&gt;
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28 changes: 9 additions & 19 deletions tutorial/in-memory-model.html
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Original file line number Diff line number Diff line change
Expand Up @@ -518,17 +518,8 @@ <h2 id="the-query-interpreter-and-cursor" class="section"><a class="anchor-link
<h2 id="the-service" class="section"><a class="anchor-link left" href="#the-service"><i class="icofont-laika link">&#xef71;</i></a>The service</h2>
<p>What we&#39;ve seen so far allows us to compile and execute GraphQL queries against our in-memory model. We now need to
expose that via HTTP. The following shows how we do that for http4s,</p>
<pre><code class="nohighlight"><span class="keyword">trait</span><span> </span><span class="type-name">GraphQLService</span><span>[</span><span class="type-name">F</span><span>[</span><span class="identifier">_</span><span>]] {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">runQuery</span><span>(</span><span class="identifier">op</span><span>: </span><span class="type-name">Option</span><span>[</span><span class="type-name">String</span><span>], </span><span class="identifier">vars</span><span>: </span><span class="type-name">Option</span><span>[</span><span class="type-name">Json</span><span>], </span><span class="identifier">query</span><span>: </span><span class="type-name">String</span><span>): </span><span class="type-name">F</span><span>[</span><span class="type-name">Json</span><span>]
}

</span><span class="keyword">object</span><span> </span><span class="type-name">GraphQLService</span><span> {

</span><span class="keyword">def</span><span> </span><span class="declaration-name">fromMapping</span><span>[</span><span class="type-name">F</span><span>[</span><span class="identifier">_</span><span>]: </span><span class="type-name">Concurrent</span><span>](</span><span class="identifier">mapping</span><span>: </span><span class="type-name">Mapping</span><span>[</span><span class="type-name">F</span><span>]): </span><span class="type-name">GraphQLService</span><span>[</span><span class="type-name">F</span><span>] =
(</span><span class="identifier">op</span><span>: </span><span class="type-name">Option</span><span>[</span><span class="type-name">String</span><span>], </span><span class="identifier">vars</span><span>: </span><span class="type-name">Option</span><span>[</span><span class="type-name">Json</span><span>], </span><span class="identifier">query</span><span>: </span><span class="type-name">String</span><span>) =&gt;
</span><span class="identifier">mapping</span><span>.</span><span class="identifier">compileAndRun</span><span>(</span><span class="identifier">query</span><span>, </span><span class="identifier">op</span><span>, </span><span class="identifier">vars</span><span>)

</span><span class="keyword">def</span><span> </span><span class="declaration-name">routes</span><span>[</span><span class="type-name">F</span><span>[</span><span class="identifier">_</span><span>]: </span><span class="type-name">Concurrent</span><span>](</span><span class="identifier">prefix</span><span>: </span><span class="type-name">String</span><span>, </span><span class="identifier">svc</span><span>: </span><span class="type-name">GraphQLService</span><span>[</span><span class="type-name">F</span><span>]): </span><span class="type-name">HttpRoutes</span><span>[</span><span class="type-name">F</span><span>] = {
<pre><code class="nohighlight"><span class="keyword">object</span><span> </span><span class="type-name">GraphQLService</span><span> {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">mkRoutes</span><span>[</span><span class="type-name">F</span><span>[</span><span class="identifier">_</span><span>]: </span><span class="type-name">Concurrent</span><span>](</span><span class="identifier">prefix</span><span>: </span><span class="type-name">String</span><span>)(</span><span class="identifier">mapping</span><span>: </span><span class="type-name">Mapping</span><span>[</span><span class="type-name">F</span><span>]): </span><span class="type-name">HttpRoutes</span><span>[</span><span class="type-name">F</span><span>] = {
</span><span class="keyword">val</span><span> </span><span class="identifier">dsl</span><span> = </span><span class="keyword">new</span><span> </span><span class="type-name">Http4sDsl</span><span>[</span><span class="type-name">F</span><span>]{}
</span><span class="keyword">import</span><span> </span><span class="identifier">dsl</span><span>.</span><span class="identifier">_</span><span>

Expand All @@ -554,7 +545,7 @@ <h2 id="the-service" class="section"><a class="anchor-link left" href="#the-serv
</span><span class="identifier">errors</span><span> =&gt; </span><span class="type-name">BadRequest</span><span>(</span><span class="identifier">errors</span><span>.</span><span class="identifier">map</span><span>(</span><span class="identifier">_</span><span>.</span><span class="identifier">sanitized</span><span>).</span><span class="identifier">mkString_</span><span>(</span><span class="string-literal">&quot;&quot;</span><span>, </span><span class="string-literal">&quot;,&quot;</span><span>, </span><span class="string-literal">&quot;&quot;</span><span>)),
</span><span class="identifier">vars</span><span> =&gt;
</span><span class="keyword">for</span><span> {
</span><span class="identifier">result</span><span> &lt;- </span><span class="identifier">svc</span><span>.</span><span class="identifier">runQuery</span><span>(</span><span class="identifier">op</span><span>, </span><span class="identifier">vars</span><span>, </span><span class="identifier">query</span><span>)
</span><span class="identifier">result</span><span> &lt;- </span><span class="identifier">mapping</span><span>.</span><span class="identifier">compileAndRun</span><span>(</span><span class="identifier">query</span><span>, </span><span class="identifier">op</span><span>, </span><span class="identifier">vars</span><span>)
</span><span class="identifier">resp</span><span> &lt;- </span><span class="type-name">Ok</span><span>(</span><span class="identifier">result</span><span>)
} </span><span class="keyword">yield</span><span> </span><span class="identifier">resp</span><span>
)
Expand All @@ -571,7 +562,7 @@ <h2 id="the-service" class="section"><a class="anchor-link left" href="#the-serv
)
</span><span class="identifier">op</span><span> = </span><span class="identifier">obj</span><span>(</span><span class="string-literal">&quot;operationName&quot;</span><span>).</span><span class="identifier">flatMap</span><span>(</span><span class="identifier">_</span><span>.</span><span class="identifier">asString</span><span>)
</span><span class="identifier">vars</span><span> = </span><span class="identifier">obj</span><span>(</span><span class="string-literal">&quot;variables&quot;</span><span>)
</span><span class="identifier">result</span><span> &lt;- </span><span class="identifier">svc</span><span>.</span><span class="identifier">runQuery</span><span>(</span><span class="identifier">op</span><span>, </span><span class="identifier">vars</span><span>, </span><span class="identifier">query</span><span>)
</span><span class="identifier">result</span><span> &lt;- </span><span class="identifier">mapping</span><span>.</span><span class="identifier">compileAndRun</span><span>(</span><span class="identifier">query</span><span>, </span><span class="identifier">op</span><span>, </span><span class="identifier">vars</span><span>)
</span><span class="identifier">resp</span><span> &lt;- </span><span class="type-name">Ok</span><span>(</span><span class="identifier">result</span><span>)
} </span><span class="keyword">yield</span><span> </span><span class="identifier">resp</span><span>
}
Expand All @@ -595,15 +586,14 @@ <h2 id="putting-it-all-together" class="section"><a class="anchor-link left" hre
<code>StarWarsService</code> defined above, and a <code>ResourceService</code> to serve the GraphQL Playground web client,</p>
<pre class="keep-together pdf epub"><code class="nohighlight"><span class="keyword">object</span><span> </span><span class="type-name">Main</span><span> </span><span class="keyword">extends</span><span> </span><span class="type-name">IOApp</span><span> {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">run</span><span>(</span><span class="identifier">args</span><span>: </span><span class="type-name">List</span><span>[</span><span class="type-name">String</span><span>]): </span><span class="type-name">IO</span><span>[</span><span class="type-name">ExitCode</span><span>] = {
</span><span class="keyword">val</span><span> </span><span class="identifier">starWarsGraphQLRoutes</span><span> = </span><span class="type-name">GraphQLService</span><span>.</span><span class="identifier">routes</span><span>[</span><span class="type-name">IO</span><span>](
</span><span class="string-literal">&quot;starwars&quot;</span><span>,
</span><span class="type-name">GraphQLService</span><span>.</span><span class="identifier">fromMapping</span><span>(</span><span class="keyword">new</span><span> </span><span class="type-name">StarWarsMapping</span><span>[</span><span class="type-name">IO</span><span>] </span><span class="keyword">with</span><span> </span><span class="type-name">StarWarsData</span><span>[</span><span class="type-name">IO</span><span>])
)
</span><span class="type-name">DemoServer</span><span>.</span><span class="identifier">resource</span><span>(</span><span class="identifier">starWarsGraphQLRoutes</span><span>).</span><span class="identifier">useForever</span><span>
(</span><span class="keyword">for</span><span> {
</span><span class="identifier">starWarsRoutes</span><span> &lt;- </span><span class="type-name">StarWarsMapping</span><span>[</span><span class="type-name">IO</span><span>].</span><span class="identifier">map</span><span>(</span><span class="identifier">mkRoutes</span><span>(</span><span class="string-literal">&quot;starwars&quot;</span><span>))
</span><span class="identifier">_</span><span> &lt;- </span><span class="identifier">mkServer</span><span>(</span><span class="identifier">starWarsRoutes</span><span>)
} </span><span class="keyword">yield</span><span> ()).</span><span class="identifier">useForever</span><span>
}
}</span></code></pre>
<pre><code class="nohighlight"><span class="keyword">object</span><span> </span><span class="type-name">DemoServer</span><span> {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">resource</span><span>(</span><span class="identifier">graphQLRoutes</span><span>: </span><span class="type-name">HttpRoutes</span><span>[</span><span class="type-name">IO</span><span>]): </span><span class="type-name">Resource</span><span>[</span><span class="type-name">IO</span><span>, </span><span class="type-name">Unit</span><span>] = {
</span><span class="keyword">def</span><span> </span><span class="declaration-name">mkServer</span><span>(</span><span class="identifier">graphQLRoutes</span><span>: </span><span class="type-name">HttpRoutes</span><span>[</span><span class="type-name">IO</span><span>]): </span><span class="type-name">Resource</span><span>[</span><span class="type-name">IO</span><span>, </span><span class="type-name">Unit</span><span>] = {
</span><span class="keyword">val</span><span> </span><span class="identifier">httpApp0</span><span> = (
</span><span class="comment">// Routes for static resources, i.e. GraphQL Playground
</span><span> </span><span class="identifier">resourceServiceBuilder</span><span>[</span><span class="type-name">IO</span><span>](</span><span class="string-literal">&quot;/assets&quot;</span><span>).</span><span class="identifier">toRoutes</span><span> &lt;+&gt;
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