scripts: update build-protos script to download protos from github

Author: jamaljsr

app/scripts/build-protos.js

@@ -1,11 +1,22 @@
 /* eslint-disable @typescript-eslint/no-var-requires */
 const util = require('util');
+const https = require('https');
 const exec = util.promisify(require('child_process').exec);
 const { promises: fs } = require('fs');
 const { join, sep } = require('path');
 const { platform } = require('os');
 const appPath = join(__dirname, '..');
 
+/** Specify the versions of LND and Loop protos to download */
+const LND_VERSION = 'v0.11.1-beta';
+const LOOP_VERSION = 'v0.11.2-beta';
+
+/** mapping of proto files to the github url to download each from */
+const protoSources = {
+  lnd: `lightningnetwork/lnd/${LND_VERSION}/lnrpc/rpc.proto`,
+  loop: `lightninglabs/loop/${LOOP_VERSION}/looprpc/client.proto`,
+};
+
 /** list of proto files and patches to apply */
 const filePatches = {
   lnd: 'lnrpc: {}',
@@ -14,11 +25,33 @@ const filePatches = {
   'google/api/http': 'google: { api: {} }',
 };
 
+/**
+ * Downloads the *.proto files into the `../proto` dir
+ */
+const download = async () => {
+  console.log('\nDownloading proto files...');
+  for ([name, urlPath] of Object.entries(protoSources)) {
+    const url = `https://raw.githubusercontent.com/${urlPath}`;
+    const filePath = join(appPath, '..', 'proto', `${name}.proto`);
+    console.log(`${url}`);
+    console.log(` -> ${filePath}`);
+    const content = await new Promise((resolve, reject) => {
+      https.get(url, res => {
+        let data = '';
+        res.on('data', chunk => (data += chunk));
+        res.on('error', err => reject(err));
+        res.on('end', () => resolve(data));
+      });
+    });
+    await fs.writeFile(filePath, content);
+  }
+};
+
 /**
  * Executes the `protoc` compiler to convert *.proto files into TS & JS code
  */
 const generate = async () => {
-  console.log('Compiling protobuf definitions');
+  console.log('\nCompiling protobuf definitions...');
   await fs.mkdir('./src/types/generated', { recursive: true });
 
   const protocGen = join(
@@ -37,11 +70,10 @@ const generate = async () => {
   ].join(' ');
 
   console.log(protocCmd);
-  const { stdout, stderr } = await exec(protocCmd, { cwd: appPath });
+  const { stderr } = await exec(protocCmd, { cwd: appPath });
   if (stderr) {
     throw new Error(`exec stderr:\n${stderr}`);
   }
-  console.log(stdout);
 };
 
 /**
@@ -50,7 +82,7 @@ const generate = async () => {
  * Example: prepends `var proto = { lnrpc: {} };` to lnd_pb.js
  */
 const patch = async () => {
-  console.log('Patching generated JS files');
+  console.log('\nPatching generated JS files');
 
   for (const filename of Object.keys(filePatches)) {
     const patch = [
@@ -78,6 +110,7 @@ const patch = async () => {
  */
 const main = async () => {
   try {
+    await download();
     await generate();
     await patch();
   } catch (error) {