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util/eventbus: add a debug HTTP handler for the bus

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Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
This commit is contained in:
David Anderson
2025-03-07 08:18:33 -08:00
committed by Dave Anderson
parent 640b2fa3ae
commit d83024a63f
10 changed files with 541 additions and 3 deletions
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6
util/eventbus/assets/event.html Normal file
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<li id="monitor" hx-swap-oob="afterbegin">
<details>
<summary>{{.Count}}: {{.Type}} from {{.Event.From.Name}}, {{len .Event.To}} recipients</summary>
{{.Event.Event}}
</details>
</li>

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util/eventbus/assets/main.html Normal file
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<!DOCTYPE html>
<html>
<head>
<script src="bus/htmx.min.js"></script>
<script src="bus/htmx-websocket.min.js"></script>
<link rel="stylesheet" href="bus/style.css">
</head>
<body hx-ext="ws">
<h1>Event bus</h1>
<section>
<h2>General</h2>
{{with $.PublishQueue}}
{{len .}} pending
{{end}}
<button hx-post="bus/monitor" hx-swap="outerHTML">Monitor all events</button>
</section>
<section>
<h2>Clients</h2>
<table>
<thead>
<tr>
<th>Name</th>
<th>Publishing</th>
<th>Subscribing</th>
<th>Pending</th>
</tr>
</thead>
{{range .Clients}}
<tr id="{{.Name}}">
<td>{{.Name}}</td>
<td class="list">
<ul>
{{range .Publish}}
<li><a href="#{{.}}">{{.}}</a></li>
{{end}}
</ul>
</td>
<td class="list">
<ul>
{{range .Subscribe}}
<li><a href="#{{.}}">{{.}}</a></li>
{{end}}
</ul>
</td>
<td>
{{len ($.SubscribeQueue .Client)}}
</td>
</tr>
{{end}}
</table>
</section>
<section>
<h2>Types</h2>
{{range .Types}}
<section id="{{.}}">
<h3>{{.Name}}</h3>
<h4>Definition</h4>
<code>{{prettyPrintStruct .}}</code>
<h4>Published by:</h4>
{{if len (.Publish)}}
<ul>
{{range .Publish}}
<li><a href="#{{.Name}}">{{.Name}}</a></li>
{{end}}
</ul>
{{else}}
<ul>
<li>No publishers.</li>
</ul>
{{end}}
<h4>Received by:</h4>
{{if len (.Subscribe)}}
<ul>
{{range .Subscribe}}
<li><a href="#{{.Name}}">{{.Name}}</a></li>
{{end}}
</ul>
{{else}}
<ul>
<li>No subscribers.</li>
</ul>
{{end}}
</section>
{{end}}
</section>
</body>
</html>

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util/eventbus/assets/monitor.html Normal file
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<div>
<ul id="monitor" ws-connect="bus/monitor">
</ul>
<button hx-get="bus" hx-target="body">Stop monitoring</button>
</div>

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util/eventbus/assets/style.css Normal file
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/* CSS reset, thanks Josh Comeau: https://www.joshwcomeau.com/css/custom-css-reset/ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
input, button, textarea, select { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
p { text-wrap: pretty; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; }
#root, #__next { isolation: isolate; }
body {
line-height: 1.5;
-webkit-font-smoothing: antialiased;
}
img, picture, video, canvas, svg {
display: block;
max-width: 100%;
}
/* Local styling begins */
body {
padding: 12px;
}
div {
width: 100%;
}
section {
display: flex;
flex-direction: column;
flex-gap: 6px;
align-items: flex-start;
padding: 12px 0;
}
section > * {
margin-left: 24px;
}
section > h2, section > h3 {
margin-left: 0;
padding-bottom: 6px;
padding-top: 12px;
}
details {
padding-bottom: 12px;
}
table {
table-layout: fixed;
width: calc(100% - 48px);
border-collapse: collapse;
border: 1px solid black;
}
th, td {
padding: 12px;
border: 1px solid black;
}
td.list {
vertical-align: top;
}
ul {
list-style: none;
}
td ul {
margin: 0;
padding: 0;
}
code {
padding: 12px;
white-space: pre;
}
#monitor {
width: calc(100% - 48px);
resize: vertical;
padding: 12px;
overflow: scroll;
height: 15lh;
border: 1px inset;
min-height: 1em;
display: flex;
flex-direction: column-reverse;
}