feat: add knowledge size banner

src/components/ui/NumberTicker/index.tsx

@@ -0,0 +1,52 @@
+import { useEffect, useRef, useState } from 'react'
+
+interface NumberTickerProps {
+  value: number | null
+  duration?: number // duration in milliseconds
+  className?: string
+}
+
+export function NumberTicker({
+  value,
+  duration = 1000, // default animation duration: 1 second
+  className = '',
+}: NumberTickerProps) {
+  const [displayValue, setDisplayValue] = useState(value)
+  const prevValueRef = useRef(value ?? 0) // Store the previous value
+  const animationFrame = useRef<number>()
+
+  useEffect(() => {
+    if (typeof value !== 'number') {
+      return
+    }
+    const startValue = prevValueRef.current // Previous value
+    const targetValue = value // New value
+    const startTime = performance.now()
+
+    const animate = (currentTime: number) => {
+      const elapsed = currentTime - startTime
+      const progress = Math.min(elapsed / duration, 1) // Progress between 0 and 1
+
+      // Calculate interpolated value
+      const interpolatedValue = Math.floor(startValue + (targetValue - startValue) * progress)
+      setDisplayValue(interpolatedValue)
+
+      if (progress < 1) {
+        animationFrame.current = requestAnimationFrame(animate)
+      }
+    }
+
+    // Start animation
+    if (animationFrame.current) cancelAnimationFrame(animationFrame.current)
+    animationFrame.current = requestAnimationFrame(animate)
+
+    // Update the previous value reference
+    prevValueRef.current = value
+
+    return () => {
+      if (animationFrame.current) cancelAnimationFrame(animationFrame.current)
+    }
+  }, [value, duration])
+
+  return <span className={className}>{displayValue?.toLocaleString('en') ?? '--,---,---'}</span>
+}

src/pages/Home/Banner/index.module.scss

@@ -11,6 +11,10 @@ $backgroundColor: #232323;
   background-repeat: no-repeat;
   background-position: center center;
   background-size: auto 100%;
+  color: white;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 
   @media (width <= $mobileBreakPoint) {
     background-image: url('./ckb_explorer_banner_phone.svg');
@@ -121,3 +125,21 @@ $backgroundColor: #232323;
     padding: 16px 24px;
   }
 }
+
+.knowledgeBase {
+  text-align: center;
+  font-weight: bold;
+  font-optical-sizing: auto;
+  mix-blend-mode: difference;
+  line-height: 1.2;
+  font-size: 50px;
+
+  .ticker {
+    display: flex;
+    gap: 8px;
+  }
+
+  @media screen and (width <= 500px) {
+    font-size: 30px;
+  }
+}

src/pages/Home/Banner/index.tsx

@@ -1,3 +1,41 @@
+import { useQuery } from '@tanstack/react-query'
+import config from '../../../config'
 import styles from './index.module.scss'
+import { getKnowledgeSize } from './utils'
+import { NumberTicker } from '../../../components/ui/NumberTicker'
 
-export default () => <div className={styles.root} />
+const { BACKUP_NODES: backupNodes } = config
+
+export default () => {
+  const { data: size } = useQuery(
+    ['backup_nodes'],
+    async () => {
+      try {
+        if (backupNodes.length === 0) return null
+
+        const [size1, size2] = await Promise.race(backupNodes.map(getKnowledgeSize))
+        return size1 ?? size2
+      } catch {
+        return null
+      }
+    },
+    { refetchInterval: 12 * 1000 },
+  )
+  return (
+    <div className={styles.root}>
+      <a
+        className={styles.knowledgeBase}
+        target="_blank"
+        rel="noopener noreferrer"
+        href="https://talk.nervos.org/t/how-to-get-the-average-occupied-bytes-per-live-cell-in-ckb/7138/2?u=keith"
+      >
+        <span>Knowledge Size</span>
+        <br />
+        <div className={styles.ticker}>
+          <NumberTicker value={size ? +size : null} />
+          <span>CKBytes</span>
+        </div>
+      </a>
+    </div>
+  )
+}

src/pages/Home/Banner/utils.ts

@@ -0,0 +1,26 @@
+import BigNumber from 'bignumber.js'
+
+const EXCLUDE = BigNumber('504000000000000000')
+
+export const getKnowledgeSize = async (nodeUrl: string) => {
+  const header = await fetch(nodeUrl, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({
+      id: 1,
+      jsonrpc: '2.0',
+      method: 'get_tip_header',
+      params: [],
+    }),
+  })
+    .then(res => res.json())
+    .then(res => res.result)
+  const { dao } = header
+
+  const [, , , u] = dao
+    .slice(2)
+    .match(/\w{16}/g)
+    .map((i: string) => i.match(/\w{2}/g)?.reverse().join('') ?? '')
+  const total = BigNumber(`0x${u}`).minus(EXCLUDE).toFormat()
+  return total
+}