Building a gRPC and Protobuf Based Tool for Relay‑Manager Communication in Live Cloud Streaming

Background: In live cloud streaming, the relay module reports stream information to a manager; developers often need to query whether a stream has been pushed to a relay or retrieve relay node details without digging through logs.

RPC definition: Remote Procedure Call (RPC) enables a service on one server to invoke functions on another server over the network, abstracting socket connections; common Java RPC frameworks include Dubbo, Thrift, and Netty.

Protobuf and gRPC: Protobuf is Google's object‑serialization protocol used to define .proto files; gRPC builds on protobuf to provide a cross‑language RPC framework supporting Java, Python, C++, etc.

Environment setup: Download the latest protobuf release from the official GitHub page, extract it, and install:

./configure --prefix=/usr/local/protobuf

make

make check

make install

Install gRPC by cloning its repository:

git clone https://github.com/grpc/grpc.git

After installation, place the manager_monitor.proto file in the grpc/protos directory and generate Python code with:

python -m grpc_tools.protoc -I../../protos --python_out=. --grpc_python_out=. ../../protos/helloworld.proto

This command creates manager_monitor_pb2.py and manager_monitor_pb2_grpc.py , which contain the data‑structure definitions and RPC stubs.

Client call example: (illustrated in the original image) Using the generated client, a call to the GetNodeList service defined in the .proto file retrieves the desired relay information.

By wrapping the client logic in a Flask application, a simple, practical query tool is built, allowing testing, development, and operations engineers to obtain relay details without installing complex environments.

Conclusion: The guide demonstrates how to quickly set up protobuf and gRPC, generate code, and implement a lightweight service‑oriented tool for relay‑manager communication in live streaming scenarios.