#!/usr/bin/env -S bash -c "docker run -p 8080:8080 -it --rm \$(docker build --progress plain -f \$0 . 2>&1 | tee /dev/stderr | grep -oP 'sha256:[0-9a-f]*')"
# syntax = docker/dockerfile:1.4.0
FROM node:20
WORKDIR /root
RUN npm install sqlite3
RUN <<EOF cat >/root/schema.sql
CREATE TABLE IF NOT EXISTS clicks (
id INTEGER PRIMARY KEY AUTOINCREMENT,
time INTEGER NOT NULL
);
EOF
RUN <<EOF cat >/root/server.js
const fs = require("fs");
const http = require("http");
const sqlite3 = require("sqlite3");
const db = new sqlite3.Database(":memory:");
db.run(fs.readFileSync("/root/schema.sql", "utf8"));
const html = fs.readFileSync("/root/index.html", "utf8");
const server = http.createServer((req, res) => {
db.run("INSERT INTO clicks(time) VALUES(unixepoch())");
const data = [];
db.each(
"SELECT time as t, COUNT(*) as n FROM clicks WHERE t > unixepoch()-4*60*60 GROUP BY t-t%60",
(_, { t, n }) => data.push([Math.floor(t/60), n]),
() => {
res.writeHead(200, { "content-type": "text/html" });
res.end(html.replace("__DATA__", JSON.stringify(data)));
},
);
});
server.listen(8080, "", () => console.log("serving :8080..."));
EOF
RUN <<EOF cat >/root/index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>#!/usr/bin/env docker run</title>
</head>
<body style="font-family: monospace; font-size; 12px; ">
<div style="position: absolute; top: 0; left: 0; width: 100vw; height: 100vh; background-size: 5vh 5vh; background-image: linear-gradient(to right, f0f0f0 1px, transparent 1px), linear-gradient(to bottom, f0f0f0 1px, transparent 1px); "></div>
<span style="position: absolute; top: 1vh; left: 5vh;">Page loads over time (last 4 hours)</span>
<span id="max" style="position: absolute; top: 5vh; left: 1vh;"></span>
<span id="min" style="position: absolute; top: 95vh; left: 1vh;">0</span>
<canvas id="canvas" style="position: absolute; top: 5vh; left: 5vw; "></canvas>
<script>
(() => {
const el = document.getElementById("canvas"), ctx = el.getContext("2d");
el.width = 0.9 * window.innerWidth * window.devicePixelRatio;
el.height = 0.9 * window.innerHeight * window.devicePixelRatio;
ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
const data = __DATA__;
const max = data.reduce((prev, [_, n]) => (n > prev ? n : prev), 0);
document.getElementById("max").innerText = max;
ctx.beginPath();
ctx.moveTo(0, el.height);
const draw = (t, n) => {
const [x, y] = [el.width * (t-data[0][0])/240, el.height * (1 - n/max)];
ctx.lineTo(x, y);
ctx.moveTo(x, y);
}
let last = -1;
for (const [t, n] of data) {
if (last != -1 && t > last + 1) {
draw(last + 0.1, 0);
draw(t - 0.1, 0);
}
draw(t, n);
last = t;
}
ctx.stroke();
})();
</script>
</body>
</html>
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