starwars-starship-service-go

Star Wars Starship Service in Go

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The starship service is not strictly 🧶 Knit, it's just a simple gRPC service written using connect-go, but it's needed for the other parts of the tutorial. Feel free to just run this service and go on to the Knit specific parts. The starship service is made to listen on address http://localhost:18002. Look at the process diagram below to see where the starship service fits into the bigger picture.

%%{ init: { 'flowchart': { 'curve': 'basis' } } }%%
flowchart LR
A[Knit Client] --> B[Knit Gateway]
subgraph r [Knit Relation Service]
    R{{Relation RPCs}}
end
subgraph f [Film Service]
    F{{Film RPCs}}
end
subgraph s [Starship Service]
    S{{Starship RPCs}}
end
B --> R
B --> F
B --> S
style s stroke:#000,stroke-width:3px
style S stroke:#000,stroke-width:3px

How to run the code

To run the starship service clone the repo using git clone https://github.com/bufbuild/knit.git, then execute the following from the base of the repository (the other services must be running too).

cd tutorial/starwars-starship-service-go/cmd/starshipservice

go mod tidy
go run starshipservice.go

# Output
2023/05/01 11:32:57 Starship service starting
2023/05/01 11:32:57 Handling connect service at prefix: /buf.starwars.starship.v1.StarshipService/
2023/05/01 11:32:57 Listening on: 127.0.0.1:18002

Open another terminal, and at the base directory do:

buf curl \
"http://localhost:18002/buf.starwars.starship.v1.StarshipService/GetStarships" \
--data '{"starshipIds":["2"]}' \
--http2-prior-knowledge \
--schema tutorial/starwars-starship-service-go/proto/buf/starwars/starship/v1/starship.proto