add javascript

javascript/crawl.js

@@ -0,0 +1,69 @@
+const axios = require('axios');
+
+const visitedNodes = new Set();
+const timeout = 3000; // Timeout for requests in milliseconds
+
+async function fetchNetInfo(url) {
+    try {
+        const response = await axios.get(url, { timeout });
+        return response.data.result;
+    } catch (error) {
+        console.error(`Error fetching ${url}:`, error.message);
+        return null;
+    }
+}
+
+async function fetchStatus(url) {
+    try {
+        const response = await axios.get(url, { timeout });
+        return response.data.result;
+    } catch (error) {
+        console.error(`Error fetching ${url}:`, error.message);
+        return null;
+    }
+}
+
+async function crawlNetwork(url, maxDepth, currentDepth = 0) {
+    if (currentDepth > maxDepth) {
+        return;
+    }
+
+    const netInfo = await fetchNetInfo(url);
+    if (!netInfo) {
+        return;
+    }
+
+    const statusUrl = url.replace('/net_info', '/status');
+    const statusInfo = await fetchStatus(statusUrl);
+    if (statusInfo) {
+        const earliestBlockHeight = statusInfo.sync_info.earliest_block_height;
+        const earliestBlockTime = statusInfo.sync_info.earliest_block_time;
+        console.log(`Node: ${url}`);
+        console.log(`Earliest Block Height: ${earliestBlockHeight}`);
+        console.log(`Earliest Block Time: ${earliestBlockTime}`);
+    }
+
+    const peers = netInfo.peers;
+    const crawlPromises = peers.map(async (peer) => {
+        const remoteIp = peer.remote_ip;
+        const rpcAddress = peer.node_info.other.rpc_address.replace('tcp://', 'http://').replace('0.0.0.0', remoteIp);
+
+        if (!visitedNodes.has(rpcAddress)) {
+            visitedNodes.add(rpcAddress);
+            console.log(`Crawling: ${rpcAddress}`);
+            await crawlNetwork(`${rpcAddress}/net_info`, maxDepth, currentDepth + 1);
+        }
+    });
+
+    await Promise.all(crawlPromises);
+}
+
+const initialUrl = 'https://sifchain-rpc.polkachu.com:443/net_info';
+const maxDepth = 3; // Set the maximum depth for recursion
+
+crawlNetwork(initialUrl, maxDepth).then(() => {
+    console.log('Crawling complete.');
+}).catch((error) => {
+    console.error('Error during crawling:', error);
+});
+