Updated workflow with caching

Signed-off-by: Simone Orru <simone.orru@secomind.com>

.github/workflows/cpp-code-generation.yaml

@@ -33,27 +33,54 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - name: Install protoc
-      run: |
-        curl -LO $PB_REL/download/v$PB_VER/protoc-$PB_VER-linux-x86_64.zip
-        unzip protoc-$PB_VER-linux-x86_64.zip -d $HOME/.local
-        echo "$HOME/.local/bin" >> $GITHUB_PATH
-    - name: Install gRPC
+      with:
+        path: astarte-message-hub-proto
+    - name: Install gRPC dependencies
       run: |
-        export MY_INSTALL_DIR=$HOME/.local
         sudo apt install -y build-essential autoconf libtool pkg-config
-        git clone --recurse-submodules --depth 1 --shallow-submodules -b v1.66.1 https://github.com/grpc/grpc
-        cd grpc
-        mkdir -p cmake/build
-        cd cmake/build
-        cmake -DgRPC_INSTALL=ON -DgRPC_BUILD_TESTS=OFF -DCMAKE_INSTALL_PREFIX=$MY_INSTALL_DIR ../..
+    - name: Check out the gRPC repo
+      run: git clone --recurse-submodules -b v1.66.1 --depth 1 --shallow-submodules https://github.com/grpc/grpc
+    - name: Set MY_INSTALL_DIR variable
+      run: |
+        MY_INSTALL_DIR=$PWD/grpc-install
+        echo "MY_INSTALL_DIR=$MY_INSTALL_DIR" >> $GITHUB_ENV
+        mkdir -p $MY_INSTALL_DIR
+        echo "$MY_INSTALL_DIR" >> "$GITHUB_PATH"
+    - name: Restore cached gRPC build directory
+      id: cache-grpc-cpp-restore
+      uses: actions/cache/restore@v4
+      with:
+        path: |
+          ./grpc/cmake
+          ./grpc-install
+        key: grpc-cpp-v1.66.1
+    - name: Compile from source gRPC
+      if: steps.cache-grpc-cpp-restore.outputs.cache-hit != 'true'
+      run: |
+        mkdir ./grpc/cmake/build
+        pushd ./grpc/cmake/build
+        cmake -DgRPC_INSTALL=ON \
+              -DgRPC_BUILD_TESTS=OFF \
+              -DCMAKE_CXX_STANDARD=17 \
+              -DCMAKE_INSTALL_PREFIX=$MY_INSTALL_DIR \
+              ../..
         make -j 4
         make install
+        popd
+    - name: Cache the gRPC build directory
+      if: steps.cache-grpc-cpp-restore.outputs.cache-hit != 'true'
+      id: cache-grpc-cpp-save
+      uses: actions/cache/save@v4
+      with:
+        path: |
+          ./grpc/cmake
+          ./grpc-install
+        key: ${{ steps.cache-grpc-cpp-restore.outputs.cache-primary-key }}
     - name: Remove old code
-      working-directory: ./cpp
+      working-directory: ./astarte-message-hub-proto/cpp
       run: (! test -d ./astarteplatform) || rm -r ./astarteplatform
     - name: Generate code
-      working-directory: ./cpp
+      working-directory: ./astarte-message-hub-proto/cpp
       run: |
         mkdir -p ./cmake/build
         cd ./cmake/build
@@ -63,4 +90,4 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: cpp-dist
-        path: ./cpp/astarteplatform
+        path: ./astarte-message-hub-proto/cpp/astarteplatform