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gRPC protoc Python Client

YouTube: youtu.be/rcDdabAELnA

Python Google protoc generated GrpcServicesStub Client TodoWorld Example

Install x dotnet tool:

$ dotnet tool install --global x 

Install grpcio-tools:

$ pip install grpcio-tools

Add protoc generated TodoWorld DTOs and gRPC Service Client:

$ x proto-python https://todoworld.servicestack.net

Python protoc gRPC insecure Example

Use protoc generated DTOs and GrpcServicesStub to call TodoWorld gRPC Service in main.py:

import grpc
import services_pb2
import services_pb2_grpc

def run():
    with grpc.insecure_channel('todoworld.servicestack.net:5054') as channel:

        client = services_pb2_grpc.GrpcServicesStub(channel)
        response = client.GetHello(services_pb2.Hello(Name="gRPC Python"))
        print(response.Result)

if __name__ == '__main__':
    run()

Create main.py with the above Python Example:

$ x mix todoworld-python

Run example:

$ python main.py

Python protoc gRPC SSL Example

Download TodoWorld SSL Certificate used for its gRPC HTTP/2 Services:

$ x get https://todoworld.servicestack.net/grpc.crt 

Use certificate when initializing GrpcServicesStub:

import grpc
import services_pb2
import services_pb2_grpc

def run():
    with open('grpc.crt', 'rb') as f:
        credentials = grpc.ssl_channel_credentials(f.read())
    with grpc.secure_channel('todoworld.servicestack.net:50051', credentials) as channel:

        client = services_pb2_grpc.GrpcServicesStub(channel)
        response = client.GetHello(services_pb2.Hello(Name="gRPC Python"))
        print(response.Result)

if __name__ == '__main__':
    run()

Override main.py with the above Python Example:

$ x mix todoworld-python-ssl

Run example:

$ python main.py

Python Local Development gRPC SSL CRUD Example

import grpc
import services_pb2
import services_pb2_grpc

def run():

    with open('dev.crt', 'rb') as f:
        cer = f.read()
    credentials = grpc.ssl_channel_credentials(cer)
    with grpc.secure_channel('localhost:5001', credentials) as channel:

        client = services_pb2_grpc.GrpcServicesStub(channel)
        client.PostResetTodos(services_pb2.ResetTodos())

        print("TODO EXAMPLE")

        # POST /todos
        todo = client.PostCreateTodo(services_pb2.CreateTodo(Title="ServiceStack")).Result
        print(f'new todo Id: {todo.Id}, Title: {todo.Title}')

        # GET /todos
        all = client.CallGetTodos(services_pb2.GetTodos())
        print(f'todos: {len(all.Results)}')

        # GET /todos/1
        todo = (client.CallGetTodo(services_pb2.GetTodo(Id=todo.Id))).Result
        print(f'get todo Id: {todo.Id}, Title: {todo.Title}')

        # PUT /todos/1
        client.PutUpdateTodo(services_pb2.UpdateTodo(Id=todo.Id, Title='gRPC'))

        # GET /todos/1
        todo = (client.CallGetTodo(services_pb2.GetTodo(Id=todo.Id))).Result
        print(f'get todo Id: {todo.Id}, Title: {todo.Title}')

        # DELETE /todos/1
        client.CallDeleteTodo(services_pb2.DeleteTodo(Id=todo.Id))

        # GET /todos
        all = client.CallGetTodos(services_pb2.GetTodos())
        print(f'todos: {len(all.Results)}')

if __name__ == '__main__':
    run()

Refer to /src/clients/python for a complete example project.