This repo shows how Dig callbacks from this PR and fx Running events from this PR can be used to easily identify dead Fx constructors/decorators.
This is done through a custom fxevent.Logger that wraps your usual logger,
but additionally keeps track of functions that haven't been run yet.
This is implemented in dead_fn_wrapper.go.
The actual Fx app is created in main.go. The app contains a couple
functions that aren't used, which we print out, providing output:
Found 5 dead functions:
- "MySubModule:fx_dead_code_demo/subpkg.StringToBool()" from:
fx_dead_code_demo/subpkg.init (/home/user/go/src/github.com/JacobOaks/fx_dead_code_demo/subpkg/subpkg.go:11)
runtime.doInit (/opt/go/root/src/runtime/proc.go:6506)
runtime.doInit (/opt/go/root/src/runtime/proc.go:6483)
runtime.main (/opt/go/root/src/runtime/proc.go:233)
- "MyModule:main.uint16ToUint32()" from:
main.init (/home/user/go/src/github.com/JacobOaks/fx_dead_code_demo/main.go:25)
runtime.doInit (/opt/go/root/src/runtime/proc.go:6506)
runtime.main (/opt/go/root/src/runtime/proc.go:233)
- "go.uber.org/fx.New.func1()" from:
go.uber.org/fx.New (/home/user/go-repos/pkg/mod/github.com/!jacob!oaks/fx@v0.0.0-20230502170936-64fdf63ce654/app.go:475)
main.main (/home/user/go/src/github.com/JacobOaks/fx_dead_code_demo/main.go:36)
runtime.main (/opt/go/root/src/runtime/proc.go:250)
- "go.uber.org/fx.(*App).shutdowner-fm()" from:
go.uber.org/fx.New (/home/user/go-repos/pkg/mod/github.com/!jacob!oaks/fx@v0.0.0-20230502170936-64fdf63ce654/app.go:475)
main.main (/home/user/go/src/github.com/JacobOaks/fx_dead_code_demo/main.go:36)
runtime.main (/opt/go/root/src/runtime/proc.go:250)
- "go.uber.org/fx.(*App).dotGraph-fm()" from:
go.uber.org/fx.New (/home/user/go-repos/pkg/mod/github.com/!jacob!oaks/fx@v0.0.0-20230502170936-64fdf63ce654/app.go:475)
main.main (/home/user/go/src/github.com/JacobOaks/fx_dead_code_demo/main.go:36)
runtime.main (/opt/go/root/src/runtime/proc.go:250)
The bottom three are internal Fx functions that get provided to every app.