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67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
# gRPC Interop Example
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This example shows that **any standard gRPC client** can call a go-micro service — no go-micro SDK required on the client side.
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The server is a normal go-micro service using the gRPC transport. The client is a plain `google.golang.org/grpc` client with no go-micro imports.
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## How it works
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go-micro's gRPC server uses a [`grpc.UnknownServiceHandler`](https://pkg.go.dev/google.golang.org/grpc#UnknownServiceHandler) that catches all incoming requests and routes them by parsing the standard gRPC method path (`/package.Service/Method`). This means any language with gRPC support (Python, Java, Rust, etc.) can call go-micro services using generated protobuf stubs.
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## Running
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Start the server:
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```bash
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cd examples/grpc-interop
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go run ./server/
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```
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In another terminal, call it with the standard gRPC client:
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```bash
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cd examples/grpc-interop
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go run ./client/ --name Alice
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# Response: Hello Alice
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```
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## Calling from other languages
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Generate stubs from `proto/greeter.proto` in your language of choice and point them at `localhost:50051`. For example, with Python:
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```bash
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pip install grpcio-tools
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python -m grpc_tools.protoc -Iproto --python_out=. --grpc_python_out=. proto/greeter.proto
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```
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```python
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import grpc
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import greeter_pb2
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import greeter_pb2_grpc
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channel = grpc.insecure_channel("localhost:50051")
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stub = greeter_pb2_grpc.GreeterStub(channel)
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response = stub.Hello(greeter_pb2.HelloRequest(name="Alice"))
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print(response.message) # Hello Alice
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```
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## Key points
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- The go-micro server registers handlers via `pb.RegisterGreeterHandler()`
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- The standard gRPC client uses stubs generated by `protoc-gen-go-grpc`
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- Both share the same `.proto` file — that's the contract
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- The server uses protobuf encoding on the wire, same as any gRPC service
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- Service discovery (mDNS, consul, etc.) is only needed for go-micro-to-go-micro calls; direct gRPC clients connect by address
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## Regenerating proto stubs
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```bash
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protoc --go_out=. --go_opt=paths=source_relative \
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--go-grpc_out=. --go-grpc_opt=paths=source_relative \
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--micro_out=. --micro_opt=paths=source_relative \
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proto/greeter.proto
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```
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Requires `protoc-gen-go`, `protoc-gen-go-grpc`, and `protoc-gen-micro`.
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