Due to the circular dependency, the wire cannot be generated, but the corresponding variable cannot be found when the error is reported.

[groot-guo]

Describe the bug

If I am in the following apps directory structure in app1 package, app.go

package app1

import (
	"awesomeProject/wire_test/app"
	"fmt"
)

type A struct {
	C *app.C
}

func (a *A) Add(b app.B) {
	fmt.Println(b)
}

in wire package , wire.go

//go:build wireinject
// +build wireinject

package wire

import (
	"awesomeProject/wire_test/app"
	"awesomeProject/wire_test/app/app1"

	"github.com/google/wire"
)

func Inject() *app.B {
	wire.Build(
		wire.Struct(new(app1.A), "*"),
		wire.Struct(new(app.B), "*"),
		wire.Struct(new(app.C), "*"),
	)
	return nil
}

in intance.go

package app

import "awesomeProject/wire_test/app/app1"

type B struct {
	A app1.A
}

type C struct {
}

As a result, the following error was reported. In fact, it should be a circular reference that caused the wire to fail to be generated

wire: /Users/genyuanguo/Desktop/awesomeProject/wire_test/app/wire/wire.go:13:1: inject Inject: no provider found for *invalid type
        needed by awesomeProject/wire_test/app/app1.A in struct provider "A" (/Users/genyuanguo/Desktop/awesomeProject/wire_test/app/app1/app.go:8:6)
        needed by *awesomeProject/wire_test/app.B in struct provider "B" (/Users/genyuanguo/Desktop/awesomeProject/wire_test/app/intance.go:5:6)
wire: awesomeProject/wire_test/app/wire: generate failed
wire: at least one generate failure

To Reproduce

. └── app |── app1 │   └── app.go |── intance.go └── wire |── wire.go └── wire_gen.go If you use the wire directory structure like this

Expected behavior

Should report an error app1 and app circular reference.

Version

github.com/google/wire v0.5.0

Additional context

Add any other context about the problem here.

[stephanos]

I think I have a similar issue. I'm seeing wire flip flopping between success and failure - and giving a cryptic error message:

$ wire ./apps/agent
wire: apps/agent: wrote <...>/apps/agent/wire_gen.go
$ wire ./apps/agent
wire: <...>/apps/agent/t_serverbuild.go:36:26: cannot use a.Context() (value of type *engine.Context) as *invalid type value in argument to a.WebsocketWrite

I narrowed it down to a circular dependency that didn't actually occur when compiling the project the regular way (ie without the wireinject tag).

I solved this now by running go build -tags wireinject <directory with wire.go> first.