Add lightweight blockchain explorer
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juvdiaz
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@ -21,6 +21,12 @@ The default RPC endpoint is:
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http://127.0.0.1:8545
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```
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The lightweight local explorer is available at:
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```text
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http://127.0.0.1:8089
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```
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From another LAN host, use the Debian host IP:
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```text
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@ -43,6 +49,7 @@ curl -sS -X POST http://127.0.0.1:8545 \
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```bash
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BLOCKCHAIN_RPC_PORT=8545
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BLOCKCHAIN_EXPLORER_PORT=8089
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BLOCKCHAIN_CHAIN_ID=31337
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BLOCKCHAIN_BLOCK_TIME=2
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```
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@ -12,6 +12,19 @@ services:
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- "${BLOCKCHAIN_CHAIN_ID:-31337}"
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- --block-time
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- "${BLOCKCHAIN_BLOCK_TIME:-2}"
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- --allow-origin
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- "*"
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ports:
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- "${BLOCKCHAIN_RPC_PORT:-8545}:8545"
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restart: unless-stopped
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explorer:
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image: nginx:1.27-alpine
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container_name: homelab-blockchain-explorer
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depends_on:
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- anvil
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ports:
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- "${BLOCKCHAIN_EXPLORER_PORT:-8089}:80"
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volumes:
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- ./explorer:/usr/share/nginx/html:ro
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restart: unless-stopped
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@ -0,0 +1,187 @@
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Homelab Devnet Explorer</title>
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<style>
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:root {
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color-scheme: light dark;
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font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
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line-height: 1.4;
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}
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body {
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margin: 0;
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background: #111827;
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color: #f9fafb;
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}
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main {
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width: min(980px, calc(100% - 32px));
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margin: 0 auto;
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padding: 32px 0;
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}
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h1 {
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margin: 0 0 8px;
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font-size: 1.8rem;
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}
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.toolbar,
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.grid,
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pre {
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border: 1px solid #374151;
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background: #1f2937;
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border-radius: 8px;
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}
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.toolbar {
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display: flex;
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gap: 8px;
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align-items: center;
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padding: 12px;
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margin: 24px 0;
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}
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input {
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flex: 1;
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min-width: 0;
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padding: 10px;
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border: 1px solid #4b5563;
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border-radius: 6px;
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background: #111827;
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color: #f9fafb;
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}
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button {
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padding: 10px 14px;
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border: 0;
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border-radius: 6px;
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background: #38bdf8;
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color: #0f172a;
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font-weight: 700;
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cursor: pointer;
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}
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.grid {
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display: grid;
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grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
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gap: 1px;
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overflow: hidden;
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}
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.metric {
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padding: 16px;
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background: #111827;
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}
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.metric span {
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display: block;
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color: #9ca3af;
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font-size: 0.78rem;
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text-transform: uppercase;
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}
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.metric strong {
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display: block;
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margin-top: 6px;
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font-size: 1.2rem;
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word-break: break-word;
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}
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pre {
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padding: 16px;
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white-space: pre-wrap;
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word-break: break-word;
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min-height: 120px;
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}
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</style>
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</head>
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<body>
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<main>
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<h1>Homelab Devnet Explorer</h1>
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<p>Local Anvil chain view. Use only dev wallets and dev keys.</p>
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<section class="toolbar">
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<input id="rpcUrl" value="http://127.0.0.1:8545" aria-label="JSON-RPC URL">
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<button id="refresh">Refresh</button>
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</section>
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<section class="grid" aria-label="Devnet metrics">
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<div class="metric">
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<span>Chain ID</span>
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<strong id="chainId">unknown</strong>
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</div>
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<div class="metric">
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<span>Latest Block</span>
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<strong id="blockNumber">unknown</strong>
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</div>
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<div class="metric">
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<span>Gas Price</span>
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<strong id="gasPrice">unknown</strong>
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</div>
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<div class="metric">
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<span>Peer Count</span>
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<strong id="peerCount">unknown</strong>
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</div>
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</section>
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<h2>Latest Block</h2>
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<pre id="latestBlock">Waiting for refresh...</pre>
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</main>
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<script>
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const fields = {
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chainId: document.querySelector("#chainId"),
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blockNumber: document.querySelector("#blockNumber"),
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gasPrice: document.querySelector("#gasPrice"),
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peerCount: document.querySelector("#peerCount"),
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latestBlock: document.querySelector("#latestBlock"),
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rpcUrl: document.querySelector("#rpcUrl")
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};
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async function rpc(method, params = []) {
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const response = await fetch(fields.rpcUrl.value, {
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method: "POST",
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headers: { "content-type": "application/json" },
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body: JSON.stringify({ jsonrpc: "2.0", method, params, id: Date.now() })
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});
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const payload = await response.json();
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if (payload.error) {
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throw new Error(payload.error.message || JSON.stringify(payload.error));
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}
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return payload.result;
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}
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function hexToDecimal(value) {
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return Number.parseInt(value, 16).toString();
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}
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async function refresh() {
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fields.latestBlock.textContent = "Loading...";
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try {
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const [chainId, blockNumber, gasPrice, peerCount] = await Promise.all([
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rpc("eth_chainId"),
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rpc("eth_blockNumber"),
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rpc("eth_gasPrice"),
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rpc("net_peerCount")
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]);
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fields.chainId.textContent = hexToDecimal(chainId);
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fields.blockNumber.textContent = hexToDecimal(blockNumber);
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fields.gasPrice.textContent = `${hexToDecimal(gasPrice)} wei`;
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fields.peerCount.textContent = hexToDecimal(peerCount);
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const block = await rpc("eth_getBlockByNumber", [blockNumber, false]);
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fields.latestBlock.textContent = JSON.stringify(block, null, 2);
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} catch (error) {
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fields.latestBlock.textContent = error.message;
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}
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}
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document.querySelector("#refresh").addEventListener("click", refresh);
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refresh();
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setInterval(refresh, 10000);
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</script>
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</body>
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</html>
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