#!/bin/bash
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set -ex

readonly NANOPB_TMP_OUTPUT="$(mktemp -d)"

# install protoc version 3
pushd third_party/protobuf
./autogen.sh
./configure
make
make install
ldconfig
popd

if [ ! -x "/usr/local/bin/protoc" ]; then
  echo "Error: protoc not found in path"
  exit 1
fi
readonly PROTOC_PATH='/usr/local/bin'
# stack up and change to nanopb's proto generator directory
pushd third_party/nanopb/generator/proto
PATH="$PROTOC_PATH:$PATH" make

# back to the root directory
popd


# nanopb-compile the proto to a temp location
PATH="$PROTOC_PATH:$PATH" ./tools/codegen/core/gen_load_balancing_proto.sh \
  src/proto/grpc/lb/v0/load_balancer.proto \
  $NANOPB_TMP_OUTPUT

# compare outputs to checked compiled code
if ! diff -r $NANOPB_TMP_OUTPUT src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0; then
  echo "Outputs differ: $NANOPB_TMP_OUTPUT vs src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0"
  exit 2
fi