event rate bars

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+      }
+    },
     "node_modules/resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
       "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=4"
···
         "iojs": ">=1.0.0",
         "node": ">=0.10.0"
       }
+    },
+    "node_modules/robust-predicates": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.2.tgz",
+      "integrity": "sha512-IXgzBWvWQwE6PrDI05OvmXUIruQTcoMDzRsOd5CDvHCVLcLHMTSYvOK5Cm46kWqlV3yAbuSpBZdJ5oP5OUoStg==",
+      "license": "Unlicense"
     },
     "node_modules/rollup": {
       "version": "4.40.2",
···
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/source-map": {
+      "version": "0.5.7",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+      "integrity": "sha512-LbrmJOMUSdEVxIKvdcJzQC+nQhe8FUZQTXQy6+I75skNgn3OoQ0DZA8YnFa7gp8tqtL3KPf1kmo0R5DoApeSGQ==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
···
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/stylis": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.2.0.tgz",
+      "integrity": "sha512-Orov6g6BB1sDfYgzWfTHDOxamtX1bE/zo104Dh9e6fqJ3PooipYyfJ0pUmrZO2wAvO8YbEyeFrkV91XTsGMSrw==",
+      "license": "MIT"
+    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
···
         "node": ">=8"
       }
     },
+    "node_modules/supports-preserve-symlinks-flag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
+      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.13",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.13.tgz",
···
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/use-sync-external-store": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.5.0.tgz",
+      "integrity": "sha512-Rb46I4cGGVBmjamjphe8L/UnvJD+uPPtTkNvX5mZgqdbavhI4EbgIWJiIHXJ8bc/i9EQGPRh4DwEURJ552Do0A==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
···
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "dev": true,
       "license": "ISC"
+    },
+    "node_modules/yaml": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.0.tgz",
+      "integrity": "sha512-4lLa/EcQCB0cJkyts+FpIRx5G/llPxfP6VQU5KByHEhLxY3IJCH0f0Hy1MHI8sClTvsIb8qwRJ6R/ZdlDJ/leQ==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true,
+      "bin": {
+        "yaml": "bin.mjs"
+      },
+      "engines": {
+        "node": ">= 14.6"
+      }
     },
     "node_modules/yocto-queue": {
       "version": "0.1.0",

package.json

···
     "preview": "vite preview"
   },
   "dependencies": {
+    "@emotion/react": "^11.14.0",
+    "@emotion/styled": "^11.14.0",
+    "@mui/material": "^7.1.0",
+    "@mui/x-charts": "^8.3.1",
     "@skyware/firehose": "^0.5.1",
     "react": "^19.1.0",
     "react-dom": "^19.1.0"

src/App.css

···
   text-align: center;
 }
 
-.logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: filter 300ms;
-}
-.logo:hover {
-  filter: drop-shadow(0 0 2em #646cffaa);
-}
-.logo.react:hover {
-  filter: drop-shadow(0 0 2em #61dafbaa);
-}
-
-@keyframes logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  a:nth-of-type(2) .logo {
-    animation: logo-spin infinite 20s linear;
-  }
-}
-
-.card {
-  padding: 2em;
-}
-
-.read-the-docs {
-  color: #888;
+h1 {
+  color: #fcf8c9;
 }

src/App.tsx

···
-import { useState } from 'react'
+import { useEffect, useState } from 'react'
+import { BarChart } from '@mui/x-charts/BarChart';
 import './App.css'
+import '@mui/x-charts-vendor/d3-scale'
 import Relay from './Relay'
 import knownRelays from './knownRelays'
 
+const INTERVAL = 1600;
+const SERIES_LEN = 6;
+
 function App() {
   const [relays, setRelays] = useState([]);
+  const [receiver, setReceiver] = useState(() => () => null);
+  const [rateBars, setRateBars] = useState({ series: [] });
+
+  useEffect(() => {
+    let lastChangeover = performance.now();
+    let currentCounts = {};
+    let series = [];
+
+    setReceiver(() => (url, type, event) => {
+      if (!currentCounts[url]) currentCounts[url] = 0;
+      currentCounts[url] += 1;
+    });
+
+    const nextBlock = setInterval(() => {
+      let now = performance.now();
+      let dt = now - lastChangeover;
+      if (series.length >= SERIES_LEN - 1) series.shift();
+      series.push({
+        t: now,
+        dt,
+        counts: currentCounts,
+      });
+      lastChangeover = now;
+      currentCounts = {};
+    }, INTERVAL);
+
+    const update = () => {
+      let now = performance.now();
+      let dt = (now - lastChangeover) / 1000;
+      const relays = Object.keys(series.at(-1)?.counts || {}).toSorted();
 
-  const recieveEvent = () => null;
+      setRateBars({
+        xAxis: [{
+          data: series.map(({ t }) => (-(now - t) / 1000).toFixed(1))
+        }],
+        series: relays.map(r => ({
+          label: r,
+          data: series.map(({ dt, counts }) => {
+            if (!counts[r]) return null;
+            return (counts[r] / (dt / 1000)).toFixed(1);
+          }),
+        })),
+      });
+
+      raf = requestAnimationFrame(update);
+    };
+    let raf = requestAnimationFrame(update);
+
+    return () => {
+      setReceiver(() => () => null);
+      clearInterval(nextBlock);
+      cancelAnimationFrame(raf);
+    };
+  }, []);
 
   return (
     <>
···
           const { desc } = knownRelays.find(e => e.url === url);
           return (
             <div key={url}>
-              <Relay url={url} desc={desc} onRecievedEvent={(type, event) => recieveEvent(url, type, event)} />
+              <Relay
+                url={url}
+                desc={desc}
+                onRecieveEvent={(type, event) => receiver(url, type, event)}
+              />
             </div>
           );
         })}
+      </div>
+      <div className=".throughputs">
+        <BarChart
+          height={300}
+          {...rateBars}
+        />
       </div>
     </>
   )

src/Relay.tsx

···
 
 type firehoseState = 'connecting' | 'connected' | 'errored' | 'closed';
 
-function Relay({ url, desc, onRecievedEvent }) {
+function Relay({ url, desc, onRecieveEvent }) {
   const [state, setState] = useState('connecting');
   const [commits, setCommits] = useState(0);
 
   useEffect(() => {
     const sendIt = (type, event) => {
-      onRecievedEvent(type, event);
+      onRecieveEvent(type, event);
       setCommits(n => n + 1);
     };
     const firehose = new Firehose({ relay: url });
     firehose.on('open', () => setState('connected'));
     firehose.on('close', () => setState('closed'));
     firehose.on('reconnect', (...args) => console.info('reconnect', ...args));
-    firehose.on('error', () => setState('errored'));
+    firehose.on('error', e => console.error(e) || setState('errored'));
     firehose.on('websocketError', () => setState('errored'));
     firehose.on('commit', (ev) => sendIt('commit', ev));
     firehose.on('sync', (ev) => sendIt('sync', ev));

src/index.css

···
 
   color-scheme: light dark;
   color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
+  background-color: #121212;
 
   font-synthesis: none;
   text-rendering: optimizeLegibility;

src/main.tsx

···
 import { createRoot } from 'react-dom/client'
+import { StyledEngineProvider } from '@mui/material/styles';
+import { ThemeProvider, createTheme } from '@mui/material/styles';
 import './index.css'
 import App from './App.tsx'
 
-createRoot(document.getElementById('root')!).render(<App />)
+const theme = createTheme({
+  colorSchemes: {
+    dark: true,
+  },
+});
+
+createRoot(document.getElementById('root')!).render(
+  <StyledEngineProvider injectFirst>
+    <ThemeProvider theme={theme}>
+      <App />
+    </ThemeProvider>
+  </StyledEngineProvider>
+)