Add change-db js file to build utils

packages/build-utils/paima-build-utils/package.json

@@ -27,7 +27,8 @@
     "build": "tsc --project tsconfig.cjs.json && tsc --project tsconfig.esm.json"
   },
   "bin": {
-    "paima-build-middleware": "./scripts/esbuild.sh"
+    "paima-build-middleware": "./scripts/esbuild.sh",
+    "paima-reset-db": "./scripts/change-db.js"
   },
   "peerDependencies": {
     "esbuild": "^0.19.3",

packages/build-utils/paima-build-utils/scripts/change-db.js

@@ -0,0 +1,58 @@
+const fs = require('fs');
+const https = require('https');
+
+// RPC command
+const getBlockHeight = (url, command) =>
+  new Promise((resolve, reject) => {
+    const options = {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'Content-Length': JSON.stringify(command).length,
+      },
+    };
+
+    const req = https.request(url, options, response => {
+      let result = '';
+      response.on('data', chunk => (result += chunk));
+      response.on('end', () => resolve(parseInt(JSON.parse(result).result.number, 16)));
+    });
+    req.on('error', err => reject(err));
+    req.write(JSON.stringify(command));
+    req.end();
+  });
+
+// Update .env START_BLOCKHEIGHT with latest value from RPC command: "eth_getBlockByNumber"
+const updateEnvFile = async file => {
+  const dataEnv = await fs.promises.readFile(__dirname + '/' + file, 'utf8');
+  const url = dataEnv.match(/\nCHAIN_URI="(.+)"/)[1];
+  if (!url) throw new Error('CHAIN_URI not found');
+  const START_BLOCKHEIGHT = await getBlockHeight(url, {
+    jsonrpc: '2.0',
+    method: 'eth_getBlockByNumber',
+    params: ['latest', false],
+    id: 1,
+  });
+  const ndataEnv = dataEnv.replace(
+    /\nSTART_BLOCKHEIGHT="\d+"/,
+    `\nSTART_BLOCKHEIGHT="${START_BLOCKHEIGHT}"`
+  );
+  await fs.promises.writeFile(file, ndataEnv, 'utf8');
+  console.log(`ENV file changed: START_BLOCKHEIGHT="${START_BLOCKHEIGHT}"`);
+};
+
+// Update docker compose volume with unique new name.
+const updateDockerFile = async file => {
+  const data = await fs.promises.readFile(__dirname + '/' + file, 'utf8');
+  const ndata = data.replace(/generic(-.+)?-db/g, 'generic-' + new Date().getTime() + '-db');
+  await fs.promises.writeFile(file, ndata, 'utf8');
+};
+
+const start = async () => {
+  await updateEnvFile(`../.env.${process.env.NODE_ENV ?? 'development'}`);
+  await updateDockerFile('db/docker/docker-compose.yml');
+};
+
+start()
+  .then()
+  .catch(e => console.log('Error:', e));