practise grpc-swift-2 via youtube video

[diuming]

practise grpc-swift-2 via your voide Getting started with gRPC Swift - George Barnett.

but I encountered an issue: (Generate Swift code)
hero/v1/HeroService.proto: is a file using edition 2024, which isn't supported by code generator protoc-gen-grpc-swift

Q1) Do I need to download the protoc executable file for this project?
Q2) Is something wrong with this project's settings?

HeroService.proto

edition = "2024";

package hero.v1;

option swift_prefix = "HeorV1_";

service HeroService {
    rpc Greeting(HeroRequest) returns (HeroResponse);
}

message HeroRequest {
    string name = 1;
}

message HeroResponse {
    string name = 1;
}

% swift package --allow-writing-to-package-directory generate-grpc-code-from-protos --output-path Sources/Service/Generated -- api
Building for debugging...
[1/1] Write swift-version--58304C5D6DBC2206.txt
Build of product 'protoc-gen-grpc-swift-2' complete! (4.43s)
Building for debugging...
[1/1] Write swift-version--58304C5D6DBC2206.txt
Build of product 'protoc-gen-swift' complete! (0.11s)
error: protoc failed to generate code

--------------------------------------------------------------------------------
Command run:

/usr/local/protoc-33.2/bin/protoc \
  --plugin=protoc-gen-grpc-swift=/project/swift-grpc-hero/.build/arm64-apple-macosx/debug/protoc-gen-grpc-swift-2-tool \
  --grpc-swift_out=/project/swift-grpc-hero/Sources/Service/Generated/ \
  --proto_path=api \
  --grpc-swift_opt=Visibility=Internal \
  --grpc-swift_opt=Server=true \
  --grpc-swift_opt=Client=true \
  --grpc-swift_opt=FileNaming=FullPath \
  --grpc-swift_opt=UseAccessLevelOnImports=false \
  hero/v1/HeroService.proto

--------------------------------------------------------------------------------
Error output (stderr):

hero/v1/HeroService.proto: is a file using edition 2024, which isn't supported by code generator protoc-gen-grpc-swift.  
Please ask the owner of this code generator to add support or switch back to a maximum of edition 2023.--grpc-swift_out: 

[Lukasa]

Yeah, it looks like we don't support edition 2024 at this time, so you should be able to downgrade to edition 2023.

[diuming]

It works!

What's difference between protoc-gen-grpc-swift-2 and protoc-gen-grpc-swift-2-tool (protoc-gen-swift also)?

[diuming]

Practise
[Success]Code generation with protoc
[Success]Code generation with generate-grpc-code-from-protos
[Success]Code generation with the build plugin

Protos
├── grpc-swift-proto-generator-config.json
└── hero
    └── v1
        └── hero_service.proto

Q1)Can I specify the directory location for Protos myself(shared for HeroServe and HeroClient)?
Q2)Why my hero.pb.swift default indentation not 4?

.executableTarget(
    name: "hero-serve",
    dependencies: [
        .product(name: "GRPCCore", package: "grpc-swift-2"),
        .product(name: "GRPCProtobuf", package: "grpc-swift-protobuf"),
        .product(name: "GRPCNIOTransportHTTP2", package: "grpc-swift-nio-transport"),
    ],
    path: "Sources/HeroServe",
    plugins: [
        .plugin(name: "GRPCProtobufGenerator", package: "grpc-swift-protobuf")
    ]
),
.executableTarget(
    name: "hero-client",
    dependencies: [
        .product(name: "GRPCCore", package: "grpc-swift-2"),
        .product(name: "GRPCProtobuf", package: "grpc-swift-protobuf"),
        .product(name: "GRPCNIOTransportHTTP2", package: "grpc-swift-nio-transport"),
    ],
    path: "Sources/HeroClient",
    plugins: [
        .plugin(name: "GRPCProtobufGenerator", package: "grpc-swift-protobuf")
    ]
)

[glbrntt]

What's difference between protoc-gen-grpc-swift-2 and protoc-gen-grpc-swift-2-tool (protoc-gen-swift also)?

I think protoc-gen-grpc-swift-2-tool and protoc-gen-grpc-swift-2 are the same but the -tool suffix is added it's a dependency of a SwiftPM command plugin. In any case you shouldn't use protoc-gen-grpc-swift-2-tool directly, it's not a product of this package.

As for protoc-gen-grpc-swift-2 vs protoc-gen-swift, both are plugins to protoc. The first is for generating gRPC service code, the second is for generating message code (i.e. the input and output types for each RPC).

[glbrntt]

Q1)Can I specify the directory location for Protos myself(shared for HeroServe and HeroClient)?

The Protos directory must be anywhere within the target you have applied the build plugin too. This is a requirement for SwiftPM build plugins. In your situation you could add a third target which uses the plugin which hero-client and hero-server depend on.

Q2)Why my hero.pb.swift default indentation not 4?

The https://github.com/apple/swift-protobuf project uses 2 spaces by default.