Created
May 22, 2020 02:39
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Mongoose maximum connections demonstration
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8" /> | |
<title>MG Connection Test</title> | |
<style> | |
body { | |
display: flex; | |
flex-direction: column; | |
margin: 0; | |
height: 100vh; | |
font-family: monospace; | |
} | |
.top-row { | |
border-bottom: solid 1px black; | |
display: flex; | |
} | |
.top-row>* { | |
margin: 0.5em; | |
} | |
.top-row>button { | |
width: 4em; | |
font-weight: bold; | |
} | |
button.add { | |
background: rgb(229, 248, 229); | |
} | |
button.remove { | |
background: rgb(248, 229, 229); | |
} | |
.top-row #summary { | |
flex-grow: 1; | |
font-variant-numeric: tabular-nums; | |
display: flex; | |
} | |
.top-row #summary>span { | |
flex-grow: 1; | |
text-align: center; | |
} | |
#status { | |
flex-grow: 1; | |
overflow-y: scroll; | |
} | |
</style> | |
<script> | |
let connections = []; // tuples of type [idx, ws] | |
let nextIdx = 1; | |
const wsReadyStateName = (rs) => { | |
switch (rs) { | |
case WebSocket.CONNECTING: return "CONNECTING"; | |
case WebSocket.OPEN: return "OPEN"; | |
case WebSocket.CLOSING: return "CLOSING"; | |
case WebSocket.CLOSED: return "CLOSED"; | |
default: return "UNKNOWN"; | |
} | |
} | |
const updateStatus = () => { | |
let counts = {}; | |
counts[WebSocket.CONNECTING] = 0; | |
counts[WebSocket.OPEN] = 0; | |
counts[WebSocket.CLOSING] = 0; | |
counts[WebSocket.CLOSED] = 0; | |
connections.forEach((conn) => { | |
const ws = conn[1]; | |
counts[ws.readyState]++; | |
}); | |
document.getElementById("summary").innerHTML = ` | |
<span>Total: ${counts[WebSocket.CONNECTING] + counts[WebSocket.OPEN] + counts[WebSocket.CLOSING]}</span> | |
<span>Connecting: ${counts[WebSocket.CONNECTING]}</span> | |
<span>Open: ${counts[WebSocket.OPEN] + counts[WebSocket.CLOSING]}</span> | |
`; | |
document.getElementById("status").innerHTML = connections.map((conn) => { | |
const idx = conn[0]; | |
const ws = conn[1]; | |
return ` | |
Connection ${idx + 1}: ${wsReadyStateName(ws.readyState)}<br /> | |
`; | |
}).join(""); | |
} | |
const addConnections = (count) => { | |
for (let i = 0; i < count; i++) { | |
const idx = nextIdx++; | |
const ws = new WebSocket(`${window.location.origin.replace("http", "ws")}/websockettest/${idx}`); | |
ws.onclose = updateStatus; | |
ws.onerror = updateStatus; | |
ws.onopen = updateStatus; | |
connections.push([idx, ws]); | |
} | |
updateStatus(); | |
} | |
const removeConnections = (count) => { | |
for (let i = 0; i < count; i++) { | |
if (connections.length == 0) { | |
return; | |
} | |
const conn = connections.shift(); | |
const ws = conn[1]; | |
ws.close(); | |
} | |
} | |
document.addEventListener('DOMContentLoaded', updateStatus, false); | |
</script> | |
</head> | |
<body> | |
<div class="top-row"> | |
<button class="remove" onClick="removeConnections(1)">-1</button> | |
<button class="add" onClick="addConnections(1)">+1</button> | |
<button class="add" onClick="addConnections(10)">+10</button> | |
<button class="add" onClick="addConnections(20)">+20</button> | |
<div id="summary"></div> | |
</div> | |
<div id="status"></div> | |
</body> | |
</html> |
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