initial commit

.gitignore

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+node_modules/

Dockerfile

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+FROM node:20-slim
+
+WORKDIR /app
+
+COPY index.js package*.json .
+
+RUN npm install --production
+
+EXPOSE 4000
+
+CMD ["node", "index.js"]

index.js

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+import { createLibp2p } from 'libp2p'
+import { generateKeyPairFromSeed } from '@libp2p/crypto/keys'
+import { webSockets } from '@libp2p/websockets'
+import { circuitRelayServer, circuitRelayTransport } from '@libp2p/circuit-relay-v2'
+import { noise } from '@chainsafe/libp2p-noise'
+import { yamux } from '@chainsafe/libp2p-yamux'
+import { identify } from '@libp2p/identify'
+
+import { createHash } from 'crypto';
+
+const publicMultiaddr = process.env.PUBLIC_MULTIADDR;
+const seed = process.env.SEED;
+
+if (typeof publicMultiaddr !== 'string' || !publicMultiaddr.length) {
+    console.log('no PUBLIC_MULTIADDR or invalid PUBLIC_MULTIADDR specified');
+    process.exit(1);
+}
+
+if (typeof seed !== 'string' || !seed.length) {
+    console.log('no SEED or invalid SEED specified');
+    process.exit(1);
+}
+
+
+const seedHash = createHash('sha512').update(seed).digest('base64');
+const key = await generateKeyPairFromSeed('Ed25519', new TextEncoder().encode(seedHash).slice(0, 32));
+
+const relay = await createLibp2p({
+    privateKey: key,
+    transports: [
+        webSockets(),
+        circuitRelayTransport(),
+    ],
+    addresses: {
+        listen: [`/ip4/0.0.0.0/tcp/4000/ws`],
+        announce: [publicMultiaddr],
+    },
+    connectionEncrypters: [noise()],
+    streamMuxers: [yamux()],
+    services: {
+        identify: identify(),
+        relay: circuitRelayServer({
+            reservations: 512,
+            reservationTTL: 2 * 60 * 60 * 1000,
+        }),
+    }
+})
+
+await relay.start()
+
+console.log('Relay listening on:')
+relay.getMultiaddrs().forEach(ma => console.log(ma.toString()))

package.json

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+{
+  "name": "libp2p-circuit-relay-v2",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "@chainsafe/libp2p-noise": "^16.1.3",
+    "@chainsafe/libp2p-yamux": "^7.0.1",
+    "@libp2p/circuit-relay-v2": "^3.2.11",
+    "@libp2p/crypto": "^5.1.1",
+    "@libp2p/identify": "^3.0.29",
+    "@libp2p/kad-dht": "^15.0.2",
+    "@libp2p/ping": "^2.0.29",
+    "@libp2p/websockets": "^9.2.10",
+    "crypto": "^1.0.1",
+    "libp2p": "^2.8.5"
+  }
+}