Use godep

Godeps/_workspace/src/github.com/codegangsta/inject/.gitignore

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+inject
+inject.test

Godeps/_workspace/src/github.com/codegangsta/inject/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2013 Jeremy Saenz
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Godeps/_workspace/src/github.com/codegangsta/inject/README.md

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+inject
+======
+
+Dependency injection for go

Godeps/_workspace/src/github.com/codegangsta/inject/inject.go

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+package inject
+
+import (
+	"fmt"
+	"reflect"
+)
+
+type Injector interface {
+	Applicator
+	Invoker
+	TypeMapper
+	SetParent(Injector)
+}
+
+type Applicator interface {
+	Apply(interface{}) error
+}
+
+type Invoker interface {
+	Invoke(interface{}) ([]reflect.Value, error)
+}
+
+type TypeMapper interface {
+	Map(interface{}) TypeMapper
+	MapTo(interface{}, interface{}) TypeMapper
+	Get(reflect.Type) reflect.Value
+}
+
+type injector struct {
+	values map[reflect.Type]reflect.Value
+	parent Injector
+}
+
+func InterfaceOf(value interface{}) reflect.Type {
+	t := reflect.TypeOf(value)
+
+	for t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+
+	if t.Kind() != reflect.Interface {
+		panic("Called inject.InterfaceOf with a value that is not a pointer to an interface. (*MyInterface)(nil)")
+	}
+
+	return t
+}
+
+func New() Injector {
+	return &injector{
+		values: make(map[reflect.Type]reflect.Value),
+	}
+}
+
+func (inj *injector) Invoke(f interface{}) ([]reflect.Value, error) {
+	t := reflect.TypeOf(f)
+
+	var in = make([]reflect.Value, t.NumIn())
+	for i := 0; i < t.NumIn(); i++ {
+		argType := t.In(i)
+		val := inj.Get(argType)
+		if !val.IsValid() {
+			return nil, fmt.Errorf("Value not found for type %v", argType)
+		}
+
+		in[i] = val
+	}
+
+	return reflect.ValueOf(f).Call(in), nil
+}
+
+func (inj *injector) Apply(val interface{}) error {
+	v := reflect.ValueOf(val)
+
+	for v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	if v.Kind() != reflect.Struct {
+		return nil
+	}
+
+	t := v.Type()
+
+	for i := 0; i < v.NumField(); i++ {
+		f := v.Field(i)
+		structField := t.Field(i)
+		if f.CanSet() && structField.Tag == "inject" {
+			ft := f.Type()
+			v := inj.Get(ft)
+			if !v.IsValid() {
+				return fmt.Errorf("Value not found for type %v", ft)
+			}
+
+			f.Set(v)
+		}
+
+	}
+
+	return nil
+}
+
+func (i *injector) Map(val interface{}) TypeMapper {
+	i.values[reflect.TypeOf(val)] = reflect.ValueOf(val)
+	return i
+}
+
+func (i *injector) MapTo(val interface{}, ifacePtr interface{}) TypeMapper {
+	i.values[InterfaceOf(ifacePtr)] = reflect.ValueOf(val)
+	return i
+}
+
+func (i *injector) Get(t reflect.Type) reflect.Value {
+	val := i.values[t]
+	if !val.IsValid() && i.parent != nil {
+		val = i.parent.Get(t)
+	}
+	return val
+}
+
+func (i *injector) SetParent(parent Injector) {
+	i.parent = parent
+}

Godeps/_workspace/src/github.com/codegangsta/inject/inject_test.go

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+package inject_test
+
+import (
+	"github.com/codegangsta/inject"
+	"reflect"
+	"testing"
+)
+
+type SpecialString interface {
+}
+
+type TestStruct struct {
+	Dep1 string        `inject`
+	Dep2 SpecialString `inject`
+	Dep3 string
+}
+
+/* Test Helpers */
+func expect(t *testing.T, a interface{}, b interface{}) {
+	if a != b {
+		t.Errorf("Expected %v (type %v) - Got %v (type %v)", b, reflect.TypeOf(b), a, reflect.TypeOf(a))
+	}
+}
+
+func refute(t *testing.T, a interface{}, b interface{}) {
+	if a == b {
+		t.Errorf("Did not expect %v (type %v) - Got %v (type %v)", b, reflect.TypeOf(b), a, reflect.TypeOf(a))
+	}
+}
+
+func Test_InjectorInvoke(t *testing.T) {
+	injector := inject.New()
+	expect(t, injector == nil, false)
+
+	dep := "some dependency"
+	injector.Map(dep)
+	dep2 := "another dep"
+	injector.MapTo(dep2, (*SpecialString)(nil))
+
+	_, err := injector.Invoke(func(d1 string, d2 SpecialString) {
+		expect(t, d1, dep)
+		expect(t, d2, dep2)
+	})
+
+	expect(t, err, nil)
+}
+
+func Test_InjectorInvokeReturnValues(t *testing.T) {
+	injector := inject.New()
+	expect(t, injector == nil, false)
+
+	dep := "some dependency"
+	injector.Map(dep)
+	dep2 := "another dep"
+	injector.MapTo(dep2, (*SpecialString)(nil))
+
+	result, err := injector.Invoke(func(d1 string, d2 SpecialString) string {
+		expect(t, d1, dep)
+		expect(t, d2, dep2)
+		return "Hello world"
+	})
+
+	expect(t, result[0].String(), "Hello world")
+	expect(t, err, nil)
+}
+
+func Test_InjectorApply(t *testing.T) {
+	injector := inject.New()
+
+	injector.Map("a dep").MapTo("another dep", (*SpecialString)(nil))
+
+	s := TestStruct{}
+	err := injector.Apply(&s)
+	expect(t, err, nil)
+
+	expect(t, s.Dep1, "a dep")
+	expect(t, s.Dep2, "another dep")
+}
+
+func Test_InterfaceOf(t *testing.T) {
+	iType := inject.InterfaceOf((*SpecialString)(nil))
+	expect(t, iType.Kind(), reflect.Interface)
+
+	iType = inject.InterfaceOf((**SpecialString)(nil))
+	expect(t, iType.Kind(), reflect.Interface)
+
+	// Expecting nil
+	defer func() {
+		rec := recover()
+		refute(t, rec, nil)
+	}()
+	iType = inject.InterfaceOf((*testing.T)(nil))
+}
+
+func Test_InjectorGet(t *testing.T) {
+	injector := inject.New()
+
+	injector.Map("some dependency")
+
+	expect(t, injector.Get(reflect.TypeOf("string")).IsValid(), true)
+	expect(t, injector.Get(reflect.TypeOf(11)).IsValid(), false)
+}
+
+func Test_InjectorSetParent(t *testing.T) {
+	injector := inject.New()
+	injector.MapTo("another dep", (*SpecialString)(nil))
+
+	injector2 := inject.New()
+	injector2.SetParent(injector)
+
+	expect(t, injector2.Get(inject.InterfaceOf((*SpecialString)(nil))).IsValid(), true)
+}