make+lnrpc: use docker to compile protos

This commit aims to make it easier for developers to compile our
protobuf definitions. They now only need to have docker installed
instead of a whole set of binaries and libraries all pinned to very
specific versions.

lnrpc/gen_protos.sh

@@ -1,28 +1,44 @@
-#!/bin/sh
+#!/bin/bash
 
-echo "Generating root gRPC server protos"
+set -e
 
-PROTOS="rpc.proto walletunlocker.proto **/*.proto"
+# generate compiles the *.pb.go stubs from the *.proto files.
+function generate() {
+  echo "Generating root gRPC server protos"
+  
+  PROTOS="rpc.proto walletunlocker.proto **/*.proto"
+  
+  # For each of the sub-servers, we then generate their protos, but a restricted
+  # set as they don't yet require REST proxies, or swagger docs.
+  for file in $PROTOS; do
+    DIRECTORY=$(dirname "${file}")
+    echo "Generating protos from ${file}, into ${DIRECTORY}"
+  
+    # Generate the protos.
+    protoc -I/usr/local/include -I. \
+      --go_out=plugins=grpc,paths=source_relative:. \
+      "${file}"
+  
+    # Generate the REST reverse proxy.
+    protoc -I/usr/local/include -I. \
+      --grpc-gateway_out=logtostderr=true,paths=source_relative,grpc_api_configuration=rest-annotations.yaml:. \
+      "${file}"
+  
+  
+    # Finally, generate the swagger file which describes the REST API in detail.
+    protoc -I/usr/local/include -I. \
+      --swagger_out=logtostderr=true,grpc_api_configuration=rest-annotations.yaml:. \
+      "${file}"
+  done
+}
 
-# For each of the sub-servers, we then generate their protos, but a restricted
-# set as they don't yet require REST proxies, or swagger docs.
-for file in $PROTOS; do
-  DIRECTORY=$(dirname "${file}")
-  echo "Generating protos from ${file}, into ${DIRECTORY}"
+# format formats the *.proto files with the clang-format utility.
+function format() {
+  find . -name "*.proto" -print0 | xargs -0 clang-format --style=file -i
+}
 
-  # Generate the protos.
-  protoc -I/usr/local/include -I. \
-    --go_out=plugins=grpc,paths=source_relative:. \
-    "${file}"
-
-  # Generate the REST reverse proxy.
-  protoc -I/usr/local/include -I. \
-    --grpc-gateway_out=logtostderr=true,paths=source_relative,grpc_api_configuration=rest-annotations.yaml:. \
-    "${file}"
-
-
-  # Finally, generate the swagger file which describes the REST API in detail.
-  protoc -I/usr/local/include -I. \
-    --swagger_out=logtostderr=true,grpc_api_configuration=rest-annotations.yaml:. \
-    "${file}"
-done
+# Compile and format the lnrpc package.
+pushd lnrpc
+format
+generate
+popd