feat: fetch hub in a loop, register new root only if neccesary

front/package.json

@@ -3,10 +3,12 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev": "NODE_OPTIONS='--max-http-header-size=24576' next dev -p 3000 & nodemon --watch ../src/Airdrop.sol --exec 'npm run deploy-airdrop && sleep 3 && ./script/log.sh'",
+    "dev": "NODE_OPTIONS='--max-http-header-size=24576' next dev -p 3000 & nodemon --watch ../src/Airdrop.sol --exec 'npm run deploy-airdrop && sleep 3 && ./script/log.sh' & nodemon --watch ./script/register-root/latest-root.txt --exec 'yarn register-root' & nodemon --exec 'yarn fetch-hub'",
     "build": "next build",
     "start": "NODE_OPTIONS='--max-http-header-size=24576' next start",
     "lint": "next lint",
+    "fetch-hub": "npx ts-node script/register-root/fetch-hub.ts",
+    "register-root": "npx ts-node script/register-root/register-root.ts",
     "deploy-airdrop": "forge script DeployAirdrop --rpc-url http://localhost:8545 -vv --mnemonics 'test test test test test test test test test test test junk' --sender '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266' --broadcast &&  ./script/generate-abi-from-front.sh"
   },
   "browser": {

front/script/register-root/fetch-hub.ts

@@ -0,0 +1,30 @@
+const axios = require("axios");
+const fs = require("fs");
+const path = require("path");
+
+const latestRootFilePath = path.join(__dirname, "latest-root.txt");
+
+const fetchHub = async () => {
+  while (true) {
+    try {
+      const res = (await axios(
+        " https://hub.sismo.io/available-data/gnosis/hydra-s2?latest=true&isOnChain=true"
+      )) as { data: { items: [{ identifier: string }] } };
+      const root = res.data?.items?.[0].identifier;
+      const latestRootSaved = fs.readFileSync(latestRootFilePath, "utf-8") as string;
+      if (latestRootSaved !== root) {
+        fs.writeFileSync(latestRootFilePath, root);
+        console.log(`New latest root ${root} on Gnosis`);
+      }
+    } catch (e) {
+      console.error(
+        "Error while fetching the latest root on Gnosis network, you seem to have lost your internet connection."
+      );
+    }
+    await new Promise((resolve) => setTimeout(resolve, 10000));
+  }
+};
+
+fetchHub();
+
+module.exports = { latestRootFilePath, path };

front/script/register-root/latest-root.txt

@@ -0,0 +1 @@
+0x1e66c7019d3ee0187b65d1cbd242fa5f9d2cea21d5d38661fc73b30258e30d3e

front/script/register-root/register-root.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+availableRootsRegistryContractAddress=$1
+lastRootOnGnosis=$2
+
+# get the owner of the roots registry contract 
+# first remove the 0x prefix, then remove the leading zeros with awk
+rootsRegistryContractOwner=$(echo $(cast call "$availableRootsRegistryContractAddress" "owner()") | awk '{sub(/^0x*/,"");}1' | awk '{sub(/^0*/,"");}1')
+
+# impersonate the owner of the roots registry contract
+cast rpc anvil_impersonateAccount $rootsRegistryContractOwner
+
+# register the root
+cast send $availableRootsRegistryContractAddress 'registerRoot(uint256)' $lastRootOnGnosis --from $rootsRegistryContractOwner --unlocked

front/script/register-root/register-root.ts

@@ -0,0 +1,34 @@
+// Script used to fetch the latest root sent on Gnosis
+// and register it in the local fork chain
+
+const { readFileSync } = require("fs");
+const { spawnSync } = require("child_process");
+const fetchHubExports = require("./fetch-hub");
+
+// on Mumbai
+const availableRootsRegistryContractAddress = "0x51B3ec080D1459232dbea86B751F75b5204a4abC";
+
+const registerRoot = (root: string) => {
+  const registerRootScriptPath = fetchHubExports.path.join(__dirname, "register-root.sh");
+  const child = spawnSync(
+    `${registerRootScriptPath} ${availableRootsRegistryContractAddress} ${root}`,
+    {
+      shell: true,
+    }
+  );
+
+  if (child.status !== 0) {
+    console.error(child.stderr.toString());
+    throw new Error("Error while registering root on the local fork");
+  }
+
+  console.group(`Root ${root} successfully registered on the local fork`);
+};
+
+const main = async () => {
+  const root = readFileSync(fetchHubExports.latestRootFilePath, "utf-8") as string;
+  console.log(`Registering root ${root} on the local fork...`);
+  registerRoot(root === "" ? "0x" : root);
+};
+
+main();

front/tsconfig.json

@@ -1,11 +1,7 @@
 {
   "compilerOptions": {
     "target": "es2020",
-    "lib": [
-      "dom",
-      "dom.iterable",
-      "esnext"
-    ],
+    "lib": ["dom", "dom.iterable", "esnext"],
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
@@ -15,7 +11,6 @@
     "module": "esnext",
     "moduleResolution": "node",
     "resolveJsonModule": true,
-    // "isolatedModules": true,
     "jsx": "preserve",
     "incremental": true,
     "plugins": [
@@ -24,19 +19,10 @@
       }
     ],
     "paths": {
-      "@/*": [
-        "./src/*"
-      ]
+      "@/*": ["./src/*"]
     },
     "isolatedModules": true
   },
-  "include": [
-    "next-env.d.ts",
-    "**/*.ts",
-    "**/*.tsx",
-    ".next/types/**/*.ts"
-  ],
-  "exclude": [
-    "node_modules"
-  ]
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
+  "exclude": ["node_modules"]
 }