make+travis: verify compiled protos on travis

.travis.yml

@@ -2,11 +2,14 @@ language: go
 cache:
   directories:
     - ~/bitcoin/bitcoin-0.19.0.1/bin
+    - $DOWNLOAD_CACHE
     - $GOCACHE
     - $GOPATH/pkg/mod
     - $GOPATH/src/github.com/btcsuite
     - $GOPATH/src/github.com/golang
+    - $GOPATH/src/github.com/grpc-ecosystem
     - $GOPATH/src/gopkg.in/alecthomas
+    - $GOPATH/src/google.golang.org
 
 # Remove Travis' default flag --depth=50 from the git clone command to make sure
 # we have the whole git history, including the commit we lint against.
@@ -19,18 +22,27 @@ go:
 env:
   global:
     - GOCACHE=$HOME/.go-build
+    - DOWNLOAD_CACHE=$HOME/download_cache
 
 sudo: required
 
-before_script: bash ./scripts/install_bitcoind.sh
+addons:
+  apt:
+    packages:
+      - clang-format
+
+before_script:
+  - bash ./scripts/install_travis_proto.sh
+  - bash ./scripts/install_bitcoind.sh
 
 jobs:
   include:
     - stage: Build
-      script: 
-      - make unit pkg=... case=_NONE_ 
-      - make lint
-      - make btcd
+      script:
+        - make rpc-check
+        - make unit pkg=... case=_NONE_
+        - make lint
+        - make btcd
     - stage: Test
       script: make travis-cover
       name: Unit Cover

Makefile

@@ -174,6 +174,14 @@ rpc:
 	@$(call print, "Compiling protos.")
 	cd ./lnrpc; ./gen_protos.sh
 
+rpc-format:
+	@$(call print, "Formatting protos.")
+	cd ./lnrpc; find . -name "*.proto" | xargs clang-format --style=file -i
+
+rpc-check: rpc-format rpc
+	@$(call print, "Verifying 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
+
 mobile-rpc:
 	@$(call print, "Creating mobile RPC from protos.")
 	cd ./mobile; ./gen_bindings.sh
@@ -223,6 +231,8 @@ clean:
 	lint \
 	list \
 	rpc \
+	rpc-format \
+	rpc-check \
 	mobile-rpc \
 	vendor \
 	ios \

lnrpc/.clang-format

@@ -0,0 +1,7 @@
+---
+Language: Proto
+BasedOnStyle: Google
+IndentWidth: 4
+AllowShortFunctionsOnASingleLine: None
+SpaceBeforeParens: Always
+CompactNamespaces: false

scripts/install_travis_proto.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+# Abort on error (-e) and print commands (-v).
+set -ev
+
+# See README.md in lnrpc why we need these specific versions/commits.
+PROTOC_VERSION=3.4.0
+PROTOBUF_VERSION="b5d812f8a3706043e23a9cd5babf2e5423744d30"
+GENPROTO_VERSION="a8101f21cf983e773d0c1133ebc5424792003214"
+GRPC_GATEWAY_VERSION="v1.8.6"
+
+# This script is specific to Travis CI 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_protobuf downloads and compiles the Golang protobuf library that
+# encodes/decodes all protobuf messages from/to Go structs.
+install_protobuf() {
+  local install_path="$GOPATH/src/github.com/golang/protobuf"
+  if [ ! -d "$install_path" ]; then
+    git clone https://github.com/golang/protobuf "$install_path"
+  fi
+  pushd "$install_path"
+  git reset --hard $PROTOBUF_VERSION
+  make
+  popd
+}
+
+# install_genproto downloads the Golang protobuf generator that converts the
+# .proto files into Go interface stubs.
+install_genproto() {
+  local install_path="$GOPATH/src/google.golang.org/genproto"
+  if [ ! -d "$install_path" ]; then
+    git clone https://github.com/google/go-genproto "$install_path"
+  fi
+  pushd "$install_path"
+  git reset --hard $GENPROTO_VERSION
+  popd
+}
+
+# install_grpc_gateway downloads and installs the gRPC gateway that converts
+# .proto files into REST gateway code.
+install_grpc_gateway() {
+  local install_path="$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway"
+  if [ ! -d "$install_path" ]; then
+    git clone https://github.com/grpc-ecosystem/grpc-gateway "$install_path"
+  fi
+  pushd "$install_path"
+  git reset --hard $GRPC_GATEWAY_VERSION
+  GO111MODULE=on go install ./protoc-gen-grpc-gateway ./protoc-gen-swagger
+  popd
+}
+
+install_protoc
+install_protobuf
+install_genproto
+install_grpc_gateway