multi: check compiled protos in GH actions

To make sure the compiled protos in the git repository are always up to
date, we add a GitHub action that checks them by compiling and diffing
the files.

.github/workflows/main.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - "*"
 
+env:
+  # go needs absolute directories, using the $HOME variable doesn't work here.
+  DOWNLOAD_CACHE: /home/runner/work/download_cache
+
 jobs:
   frontend:
     name: frontend tests on ${{ matrix.os }}
@@ -118,3 +122,54 @@ jobs:
 
       - name: build backend binary
         run: make build
+
+  proto-compile-check:
+    name: RPC proto compilation check
+    runs-on: ubuntu-latest
+    steps:
+      - name: set git config
+        run: |
+          git config --global core.eol lf
+          git config --global core.autocrlf false
+
+      - name: git checkout
+        uses: actions/checkout@v2
+
+      - name: setup nodejs v${{ matrix.node_version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: download cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/download_cache
+          key: lnd-${{ runner.os }}-download-${{ hashFiles('**/install_protoc.sh') }}
+          restore-keys: |
+            lnd-${{ runner.os }}-download-${{ hashFiles('**/install_protoc.sh') }}
+            lnd-${{ runner.os }}-download-
+
+      - name: install protoc and protobuf libraries
+        run: ./scripts/install_protoc.sh
+
+      - name: get yarn cache dir
+        id: yarn-cache-dir
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - name: yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: ${{ steps.yarn-cache-dir.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ matrix.node_version }}-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-${{ matrix.node_version }}-${{ hashFiles('**/yarn.lock') }}
+            ${{ runner.os }}-yarn-${{ matrix.node_version }}-
+            ${{ runner.os }}-yarn-
+
+      - name: install dependencies
+        working-directory: ./app
+        run: yarn
+
+      - name: run check
+        run: make protos-check

Makefile

@@ -192,6 +192,14 @@ list:
 		grep -v Makefile | \
 		sort
 
+protos:
+	@$(call print, "Compiling protos.")
+	cd ./app; yarn protos
+
+protos-check: protos
+	@$(call print, "Verifying compiled protos.")
+	if test -n "$$(git describe --dirty | grep dirty)"; then echo "Protos not properly formatted or not compiled with v3.4.0"; git status; git diff; exit 1; fi
+
 clean:
 	@$(call print, "Cleaning source.$(NC)")
 	$(RM) ./lightning-terminal-debug

scripts/install_protoc.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# Abort on error (-e) and print commands (-v).
+set -ev
+
+# See README.md in lnrpc (of the lnd repository) why we need these specific
+# versions/commits.
+PROTOC_VERSION=3.4.0
+
+# This script is specific to GitHub Actions so we only need to support linux x64.
+PROTOC_URL="https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-x86_64.zip"
+PROTOC_DL_CACHE_DIR="${DOWNLOAD_CACHE:-/tmp/download_cache}/protoc"
+
+# install_protoc copies the cached protoc binary to the $PATH or downloads it
+# if no cached version is found.
+install_protoc() {
+  if [ -f "${PROTOC_DL_CACHE_DIR}/bin/protoc" ]; then
+    echo "Using cached version of protoc"
+  else
+    wget -O /tmp/protoc.zip $PROTOC_URL
+    mkdir -p "${PROTOC_DL_CACHE_DIR}"
+    unzip -o /tmp/protoc.zip -d "${PROTOC_DL_CACHE_DIR}"
+    chmod -R a+rx "${PROTOC_DL_CACHE_DIR}/"
+  fi
+  sudo cp "${PROTOC_DL_CACHE_DIR}/bin/protoc" /usr/local/bin
+  sudo cp -r "${PROTOC_DL_CACHE_DIR}/include" /usr/local
+}
+
+install_protoc