fix: do not allow root blockHash to be set to 0x0 (#8)

package.json

@@ -34,7 +34,6 @@
     "eslint": "^8.11.0",
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-prettier": "^4.0.0",
-    "faker": "5.5.3",
     "fishery": "^2.2.2",
     "husky": "^7.0.4",
     "jest": "^27.5.1",
@@ -50,6 +49,7 @@
     "cli-table3": "^0.6.1",
     "colors": "^1.4.0",
     "ethers": "^5.6.1",
+    "faker": "5.5.3",
     "neverthrow": "^4.3.1"
   },
   "lint-staged": {

src/engine.ts

@@ -206,6 +206,9 @@ class Engine {
   }
 
   private validateRoot(root: Root): boolean {
+    if (root.message.body.blockHash.length !== 66) {
+      return false;
+    }
     // TODO: Check that the blockHash is a real block and it's block matches rootBlock.
     // TODO: Check that prevRootBlockHash is either 0x0 or root block that we know about.
     return !!root;

src/simulation.ts

@@ -3,6 +3,7 @@ import Client from '~/client';
 import Debugger from '~/debugger';
 import FCNode, { InstanceName } from '~/node';
 import { isCast, isRoot } from '~/types';
+import Faker from 'faker';
 
 // 1. Create 5 Farcaster nodes
 const nodeList = new Map<InstanceName, FCNode>();
@@ -29,7 +30,7 @@ if (!knightNode) {
 const client = new Client('alice');
 
 // 5. Send two messages, sequentially to the node.
-const m1 = client.generateRoot(0, '0x0');
+const m1 = client.generateRoot(0, Faker.datatype.hexaDecimal(64).toLowerCase());
 knightNode.addRoot(m1);
 
 let lastMsg = knightNode.getLastMessage(client.username);
@@ -70,7 +71,7 @@ console.log('Client: starting a new chain');
 
 setTimeout(() => {
   Debugger.printState();
-  const b1 = client.generateRoot(1, '0x0', m1.message.body.blockHash);
+  const b1 = client.generateRoot(1, Faker.datatype.hexaDecimal(64).toLowerCase(), m1.message.body.blockHash);
   knightNode.addRoot(b1);
 }, 30_000);