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posts-go/docs/2022-10-26-reload-config.html

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<!doctype html>
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<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="stylesheet"
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href="https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/5.5.0/github-markdown.min.css"
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/>
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<title>haunt98 posts</title>
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</head>
<style>
.markdown-body {
box-sizing: border-box;
min-width: 200px;
max-width: 980px;
margin: 0 auto;
padding: 45px;
}
@media (max-width: 767px) {
.markdown-body {
padding: 15px;
}
}
</style>
<body class="markdown-body">
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<h2>
<a href="index.html"><code>~</code></a>
</h2>
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<h1>
<a
id="user-content-reload-config"
class="anchor"
aria-hidden="true"
tabindex="-1"
href="#reload-config"
><span aria-hidden="true" class="octicon octicon-link"></span></a
>Reload config
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</h1>
<p>This serves as design draft of reload config system</p>
<div class="highlight highlight-source-wsd">
<pre><span class="pl-k">@startuml</span> Reload config
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<span class="pl-k">skinparam</span> <span class="pl-k">defaultFontName</span> <span class="pl-s">Iosevka Term SS08</span>
<span class="pl-k">participant</span> <span class="pl-c1">admin</span>
<span class="pl-k">participant</span> <span class="pl-c1">other_service</span>
<span class="pl-k">participant</span> <span class="pl-c1">config_service</span>
<span class="pl-k">participant</span> <span class="pl-c1">storage</span>
<span class="pl-k">==</span> <span class="pl-s">Admin handle</span> <span class="pl-k">==</span>
<span class="pl-c1">admin</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">config_service</span>: set/update/delete config
<span class="pl-c1">config_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">storage</span>: set/update/delete config
<span class="pl-k">==</span> <span class="pl-s">Other service handle</span> <span class="pl-k">==</span>
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">other_service</span>: init service
<span class="pl-k">activate</span> <span class="pl-c1">other_service</span>
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">storage</span>: make connection
<span class="pl-k">loop</span>
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">storage</span>: listen on config change
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">other_service</span>: save config to memory
<span class="pl-k">end</span>
<span class="pl-k">deactivate</span> <span class="pl-c1">other_service</span>
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">other_service</span>: do business
<span class="pl-k">activate</span> <span class="pl-c1">other_service</span>
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">other_service</span>: get config
<span class="pl-c1">other_service</span> <span class="pl-k">-&gt;</span> <span class="pl-c1">other_service</span>: do other business
<span class="pl-k">deactivate</span> <span class="pl-c1">other_service</span>
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<span class="pl-k">@enduml</span></pre>
</div>
<p>
Config storage can be any key value storage or database like etcd, Consul,
mySQL, ...
</p>
<p>
If storage is key value storage, maybe there is API to listen on config
change. Otherwise we should create a loop to get all config from storage
for some interval, for example each 5 minute.
</p>
<p>
Each <code>other_service</code> need to get config from its memory, not
hit <code>storage</code>. So there is some delay between upstream config
(config in <code>storage</code>) and downstream config (config in
<code>other_service</code>), but maybe we can forgive that delay (???).
</p>
<p>Pros:</p>
<ul>
<li>
<p>
Config can be dynamic, service does not need to restart to apply new
config.
</p>
</li>
<li>
<p>
Each service only keep 1 connection to <code>storage</code> to listen
to config change, not hit <code>storage</code> for each request.
</p>
</li>
</ul>
<p>Cons:</p>
<ul>
<li>Each service has 1 more dependency, aka <code>storage</code>.</li>
<li>
Need to handle fallback config, incase <code>storage</code> failure.
</li>
<li>Delay between upstream/downstream config</li>
</ul>
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<div>
Feel free to ask me via
<a href="mailto:hauvipapro+posts@gmail.com">email</a> or
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<a rel="me" href="https://hachyderm.io/@haunguyen">Mastodon</a>.
<br />Source code is available on
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<a href="https://github.com/haunt98/posts-go">GitHub</a>
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<a href="https://codeberg.org/yoshie/posts-go">Codeberg</a>
<a href="https://git.sr.ht/~youngyoshie/posts-go">sourcehut</a>
<a href="https://gitea.treehouse.systems/yoshie/posts-go">Treehouse</a>
<a href="https://gitlab.com/youngyoshie/posts-go">GitLab</a>
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</div>
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</body>
</html>