fx-issue.go

package main

import (
	"go.uber.org/fx"
)

type Fetcher interface{}

type GameFetcher interface {
	Fetcher
}

type UserFetcher interface {
	Fetcher
}

type GameFetcherImpl struct{}

type UserFetcherImpl struct{}

func newUserFetcher() *UserFetcherImpl {
	return &UserFetcherImpl{}
}

func newGameFetcher() *GameFetcherImpl {
	return &GameFetcherImpl{}
}

type StructUsingAllFetchers struct {
	fetchers []Fetcher
}

func NewStructUsingAllFetchers(fetchers []Fetcher) *StructUsingAllFetchers {
	return &StructUsingAllFetchers{
		fetchers: fetchers,
	}
}

func AsFetcher(f any, fetcherType any) any {
	return fx.Annotate(
		f,
		fx.As(new(Fetcher)),
		fx.As(fetcherType),
		fx.ResultTags(`group:"fetchers"`),
	)
}

func main() {
	fx.New(
		fx.Provide(
			AsFetcher(newGameFetcher, new(GameFetcher)),
			AsFetcher(newUserFetcher, new(UserFetcher)),
			fx.Annotate(
				NewStructUsingAllFetchers,
				fx.ParamTags(`group:"fetchers"`),
			),
		),
		fx.Invoke(func(s *StructUsingAllFetchers) {}),
		fx.Invoke(func(gameFetcher GameFetcher) {}),
	).Run()
}

[Fx] PROVIDE	main.Fetcher[group = "fetchers"] <= fx.Annotate(main.newGameFetcher(), fx.ResultTags(["group:\"fetchers\""]), fx.As([[main.Fetcher] [main.GameFetcher]])
[Fx] PROVIDE	main.GameFetcher[group = "fetchers"] <= fx.Annotate(main.newGameFetcher(), fx.ResultTags(["group:\"fetchers\""]), fx.As([[main.Fetcher] [main.GameFetcher]])
[Fx] PROVIDE	main.Fetcher[group = "fetchers"] <= fx.Annotate(main.newUserFetcher(), fx.ResultTags(["group:\"fetchers\""]), fx.As([[main.Fetcher] [main.UserFetcher]])
[Fx] PROVIDE	main.UserFetcher[group = "fetchers"] <= fx.Annotate(main.newUserFetcher(), fx.ResultTags(["group:\"fetchers\""]), fx.As([[main.Fetcher] [main.UserFetcher]])
[Fx] PROVIDE	*main.StructUsingAllFetchers <= fx.Annotate(main.NewStructUsingAllFetchers(), fx.ParamTags(["group:\"fetchers\""])
[Fx] PROVIDE	fx.Lifecycle <= go.uber.org/fx.New.func1()
[Fx] PROVIDE	fx.Shutdowner <= go.uber.org/fx.(*App).shutdowner-fm()
[Fx] PROVIDE	fx.DotGraph <= go.uber.org/fx.(*App).dotGraph-fm()
[Fx] INVOKE		main.main.func1()
[Fx] RUN	provide: fx.Annotate(main.newGameFetcher(), fx.ResultTags(["group:\"fetchers\""]), fx.As([[main.Fetcher] [main.GameFetcher]])
[Fx] RUN	provide: fx.Annotate(main.newUserFetcher(), fx.ResultTags(["group:\"fetchers\""]), fx.As([[main.Fetcher] [main.UserFetcher]])
[Fx] RUN	provide: fx.Annotate(main.NewStructUsingAllFetchers(), fx.ParamTags(["group:\"fetchers\""])
[Fx] INVOKE		main.main.func2()
[Fx] ERROR		fx.Invoke(main.main.func2()) called from:
main.main
	main.go:59
runtime.main
	/opt/homebrew/Cellar/go/1.21.5/libexec/src/runtime/proc.go:267
Failed: missing dependencies for function "main".main.func2
	main.go:59:
missing type:
	- main.GameFetcher (did you mean to use one of *main.StructUsingAllFetchers, fx.DotGraph, fx.Lifecycle, or fx.Shutdowner?)
[Fx] ERROR		Failed to start: missing dependencies for function "main".main.func2
	main.go:59:
missing type:
	- main.GameFetcher (did you mean to use one of *main.StructUsingAllFetchers, fx.DotGraph, fx.Lifecycle, or fx.Shutdowner?)
exit status 1