GRPC: set up..

get the grpc source file..

 git clone https://github.com/grpc/grpc
 git submodule update --init --recursive
 cd third-party/protobuf
 ./autogen.sh    #this step consist of a step of curl getting gmock, might failed.. advice is to use thunder to download in advance.. for more info, see this file..
 ./configure --prefix=/usr
 make
 make install
 ldconfig
 export PKG_CONFIG_PATH=/lib/pkgconfig/
 cd ../.. && vim Makefile
 make --prefix=/usr
 make install

compile the helloworld example.. is easy.. the most important is to write the server/client side .go files and one message/rpc .proto file.