This example demonstrates all four RPC types using a simple 'echo' service and client and the SwiftNIO based HTTP/2 transport.

An "echo" command line tool that uses generated stubs for an 'echo' service which allows you to start a server and to make requests against it for each of the four RPC types.

The tool uses the SwiftNIO HTTP/2 transport.

You must have the Protocol Buffers compiler (protoc) installed. You can find the instructions for doing this in the gRPC Swift Protobuf documentation. The swift commands below are all prefixed with PROTOC_PATH=$(which protoc), this is to let the build system know where protoc is located so that it can generate stubs for you. You can read more about it in the gRPC Swift Protobuf documentation.

Build and run the server using the CLI:

$ PROTOC_PATH=$(which protoc) swift run echo serve
Echo listening on [ipv4]127.0.0.1:1234

Use the CLI to make a unary 'Get' request against it:

$ PROTOC_PATH=$(which protoc) swift run echo get --message "Hello"
get → Hello
get ← Hello

Use the CLI to make a bidirectional streaming 'Update' request:

$ PROTOC_PATH=$(which protoc) swift run echo update --message "Hello World"
update → Hello
update → World
update ← Hello
update ← World

Get help with the CLI by running:

$ PROTOC_PATH=$(which protoc) swift run echo --help