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<body class="article">
<div id="header">
<h1>Ctu Frontend Server</h1>
<div id="toc" class="toc">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_who_am_i">Who am I?</a></li>
<li><a href="#_what_kind_of_smalltalk_do_i_need">What kind of Smalltalk do I need?</a></li>
<li><a href="#_what_about_the_dependencies">What about the dependencies?</a></li>
<li><a href="#_how_do_i_work">How do I work</a></li>
<li><a href="#_what_does_it_mean_frontend_and_backend">What does it mean: frontend AND backend?</a></li>
<li><a href="#_what_operating_system_do_i_need">What operating system do I need?</a></li>
<li><a href="#_what_should_i_use_as_a_base_docker_image">What should I use as a base docker image?</a></li>
<li><a href="#_more_examples">More examples</a></li>
</ul>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_who_am_i">Who am I?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>I’m an embedded webserver with some frontend functions.
You can use me either as a regular webserver for your project or
if you don’t want to distinguish the frontend side from the backend you
are able to write easily an application which contains
only one code base (instead of for example 2 projects, a frontend and a
backend for the same application).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_kind_of_smalltalk_do_i_need">What kind of Smalltalk do I need?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>My Smalltalk dialect is Cuis Smalltalk. I suggest
Cuis University as a base image. This program is tested
on <a href="https://github.com/Cuis-University/Cuis-University/releases/tag/v5093.0">CuisUniversity-5093.image</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_about_the_dependencies">What about the dependencies?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>As many programs I also have some dependencies,
if these are among the packages Cuis will install them
automatically.</p>
</div>
<div class="paragraph">
<p>My Dependencies are:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>!requires: 'Cuis-Web' 1 38 nil!
!requires: 'WebClient' 1 22 nil!
!requires: 'Regex-Core' 1 10 nil!</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_how_do_i_work">How do I work</h2>
<div class="sectionbody">
<div class="paragraph">
<p>I’ve a frontend and a backend part in one API. In the
frontend side my basic language is d3. Currently I
support <code>Bulma</code> or <code>Bootstrap 5</code> as a design framework.</p>
</div>
<div class="paragraph">
<p>As a simple example you can check my <code>FSApp</code> class
in the source code.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_does_it_mean_frontend_and_backend">What does it mean: frontend AND backend?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The easiest way to understand this let’s have an example.</p>
</div>
<div class="paragraph">
<p>Look at the following snippet:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-Smalltalk hljs" data-lang="Smalltalk"> d3s _ D3Server withServer: d3Server.
d3s select: 'body button'; <i class="conum" data-value="1"></i><b>(1)</b>
on: 'click' service: '/greet' before: [' <i class="conum" data-value="2"></i><b>(2)</b>
requestBody = d3.select("[myrole=name]")
.property("value");
xhr.setRequestHeader("myheader", "hello");
']
action: [ :rg | <i class="conum" data-value="3"></i><b>(3)</b>
rg send200Response: ('Hello dear ', (rg content) ,' from Smalltalk :)',
'with myheader: ', (rg headerAt: 'myheader'))
contentType: 'text/html; charset=utf-8'.
]
after: [' <i class="conum" data-value="4"></i><b>(4)</b>
alert(JSON.stringify(xhr.response));
'].</code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>Here you can select an element from the dom tree.</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>The <code>on:</code> part describes which event would trigger the backend service.
<div class="paragraph">
<p>With the <code>service:</code> I’ll create a backend endpoint for this event. (You can
use me safely because I’ll create the endpoint only once.)</p>
</div>
<div class="paragraph">
<p>In the <code>before:</code> you can define the request body.</p>
</div></td>
</tr>
<tr>
<td><i class="conum" data-value="3"></i><b>3</b></td>
<td>Here comes the backend action. The parameter is the http request.
+ It is important that you should send a response in every cases!</td>
</tr>
<tr>
<td><i class="conum" data-value="4"></i><b>4</b></td>
<td>In the after section you can get and handle the response from the backend.</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_operating_system_do_i_need">What operating system do I need?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>I can run natively on Linux.</p>
</div>
<div class="paragraph">
<p>Actually I should work on Windows too, but because one of
my dependencies it’s still not available. However you can
use me on Windows too by using <a href="https://www.docker.com/">Docker</a>.</p>
</div>
<div class="paragraph">
<p>For Docker I suggest to run me in headless mode:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>vm-jit/squeak -headless Cuis*.image -s mystartscript.st</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_should_i_use_as_a_base_docker_image">What should I use as a base docker image?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>My docker file can be started so:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-none hljs">FROM debian:11-slim as base
RUN set -eu; \
apt-get update; \
apt-get install --assume-yes --no-install-recommends \
ca-certificates \
libcurl3-gnutls \
libfreetype6 \
libpulse0 \
libaudio2 \
libasound2 \
nano \
ssh \
xorg; \
apt-get clean;
...</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_more_examples">More examples</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There’s an other project too which uses me. You can find it here:
<a href="https://sourceforge.net/projects/myworktimesmalltalk/">MyWorktimeSmalltalk</a>.</p>
</div>
</div>
</div>
</div>
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Last updated 2023-04-01 20:57:06 UTC
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