From c55be14d5a898938d6f9b59a246bcc3f48bb18c7 Mon Sep 17 00:00:00 2001
From: Moriz Wahl <moriz.wahl@gmx.de>
Date: Thu, 27 Oct 2022 07:26:52 +0200
Subject: [PATCH] add more code from poc

---
 backend/src/federation/index.ts | 108 +++++++++++++++++++++++++++++++-
 1 file changed, 106 insertions(+), 2 deletions(-)

diff --git a/backend/src/federation/index.ts b/backend/src/federation/index.ts
index 5dabd3e24..2ff43385f 100644
--- a/backend/src/federation/index.ts
+++ b/backend/src/federation/index.ts
@@ -1,17 +1,121 @@
+/* eslint-disable no-console */
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+
 import DHT from '@hyperswarm/dht'
 import { Connection } from '@dbTools/typeorm'
 
+function between(min: number, max: number) {
+  return Math.floor(Math.random() * (max - min + 1) + min)
+}
+
 const POLLTIME = 20000
 const SUCCESSTIME = 120000
 const ERRORTIME = 240000
 const ANNOUNCETIME = 30000
+const nodeRand = between(1, 99)
+const nodeURL = `https://test${nodeRand}.org`
+const nodeAPI = {
+  API_1_00: `${nodeURL}/api/1_00/`,
+  API_1_01: `${nodeURL}/api/1_01/`,
+  API_2_00: `${nodeURL}/graphql/2_00/`,
+}
 
 export const startDHT = async (connection: Connection, topic: string): Promise<void> => {
   try {
     console.log('topic', topic, typeof topic)
-    const buffer = Buffer.from(topic)
 
-    const TOPIC = DHT.hash(buffer)
+    const TOPIC = DHT.hash(Buffer.from(topic))
+
+    const keyPair = DHT.keyPair()
+
+    const node = new DHT({ keyPair })
+
+    const server = node.createServer()
+
+    server.on('connection', function (socket: any) {
+      // noiseSocket is E2E between you and the other peer
+      // pipe it somewhere like any duplex stream
+      console.log('Remote public key', socket.remotePublicKey.toString('hex'))
+      // console.log("Local public key", noiseSocket.publicKey.toString("hex")); // same as keyPair.publicKey
+
+      socket.on('data', (data: Buffer) => console.log('data:', data.toString('ascii')))
+
+      // process.stdin.pipe(noiseSocket).pipe(process.stdout);
+    })
+
+    await server.listen()
+
+    setInterval(async () => {
+      console.log('Announcing on topic:', TOPIC.toString('hex'))
+      await node.announce(TOPIC, keyPair).finished()
+    }, ANNOUNCETIME)
+
+    let successfulRequests: string[] = []
+    let errorfulRequests: string[] = []
+
+    setInterval(async () => {
+      console.log('Refreshing successful nodes')
+      successfulRequests = []
+    }, SUCCESSTIME)
+
+    setInterval(async () => {
+      console.log('Refreshing errorful nodes')
+      errorfulRequests = []
+    }, ERRORTIME)
+
+    setInterval(async () => {
+      const result = await node.lookup(TOPIC)
+
+      const collectedPubKeys: string[] = []
+
+      for await (const data of result) {
+        /* console.log(
+           `${data.from.host}:${data.from.port}: peers: ${data.peers.length}`
+           ); */
+        data.peers.forEach((peer: any) => {
+          const pubKey = peer.publicKey.toString('hex')
+          if (
+            pubKey !== keyPair.publicKey.toString('hex') &&
+            !successfulRequests.includes(pubKey) &&
+            !errorfulRequests.includes(pubKey) &&
+            !collectedPubKeys.includes(pubKey)
+          ) {
+            collectedPubKeys.push(peer.publicKey.toString('hex'))
+          }
+        })
+      }
+
+      console.log('Found new peers: ', collectedPubKeys)
+
+      collectedPubKeys.forEach((remotePubKey) => {
+        // publicKey here is keyPair.publicKey from above
+        const socket = node.connect(Buffer.from(remotePubKey, 'hex'))
+
+        /* socket.once("connect", function () {
+           console.log("client side emitted connect");
+           }); */
+
+        /* socket.once("end", function () {
+           console.log("client side ended");
+           }); */
+
+        socket.once('error', (err: any) => {
+          errorfulRequests.push(remotePubKey)
+          console.log(`error on peer ${remotePubKey}: ${err.message}`)
+        })
+
+        socket.on('open', function () {
+          // noiseSocket fully open with the other peer
+          // console.log("writing to socket");
+          socket.write(Buffer.from(`${nodeRand}`))
+          socket.write(Buffer.from(JSON.stringify(nodeAPI)))
+          successfulRequests.push(remotePubKey)
+        })
+        // pipe it somewhere like any duplex stream
+        // process.stdin.pipe(noiseSocket).pipe(process.stdout)
+      })
+    }, POLLTIME)
   } catch (err) {
     console.log(err)
   }