131 lines
3.0 KiB
Go
131 lines
3.0 KiB
Go
package dynamic
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import (
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"fmt"
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"reflect"
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"time"
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"github.com/sirupsen/logrus"
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)
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type testEnvironment struct {
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startTime time.Time
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}
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func InjectField(target interface{}, fieldName string, obj interface{}, pointerOnly bool) error {
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rs := reflect.ValueOf(target)
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field := rs.FieldByName(fieldName)
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if !field.IsValid() {
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return nil
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}
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if !field.CanSet() {
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return fmt.Errorf("field %s of %s can not be set", fieldName, rs.Type())
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}
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rv := reflect.ValueOf(obj)
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if field.Kind() == reflect.Ptr {
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if field.Type() != rv.Type() {
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return fmt.Errorf("field type mismatches: %s != %s", field.Type(), rv.Type())
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}
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field.Set(rv)
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} else if field.Kind() == reflect.Interface {
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field.Set(rv)
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} else {
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// set as value
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if pointerOnly {
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return fmt.Errorf("field %s %s does not allow value assignment (pointer type only)", field.Type(), rv.Type())
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}
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field.Set(rv.Elem())
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}
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return nil
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}
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// ParseStructAndInject parses the struct fields and injects the objects into the corresponding fields by its type.
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// if the given object is a reference of an object, the type of the target field MUST BE a pointer field.
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// if the given object is a struct value, the type of the target field CAN BE a pointer field or a struct value field.
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func ParseStructAndInject(f interface{}, objects ...interface{}) error {
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sv := reflect.ValueOf(f)
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st := reflect.TypeOf(f)
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if st.Kind() != reflect.Ptr {
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return fmt.Errorf("f needs to be a pointer of a struct, %s given", st)
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}
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// solve the reference
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st = st.Elem()
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sv = sv.Elem()
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if st.Kind() != reflect.Struct {
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return fmt.Errorf("f needs to be a struct, %s given", st)
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}
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for i := 0; i < sv.NumField(); i++ {
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fv := sv.Field(i)
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ft := fv.Type()
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// skip unexported fields
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if !st.Field(i).IsExported() {
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continue
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}
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fieldName := st.Field(i).Name
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switch k := fv.Kind(); k {
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case reflect.Ptr, reflect.Struct:
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for oi := 0; oi < len(objects); oi++ {
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obj := objects[oi]
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if obj == nil {
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continue
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}
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ot := reflect.TypeOf(obj)
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if ft.AssignableTo(ot) {
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if !fv.CanSet() {
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return fmt.Errorf("field %v of %s can not be set to %s, make sure it is an exported field", fv, sv.Type(), ot)
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}
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if k == reflect.Ptr && !fv.IsNil() {
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logrus.Debugf("[injection] field %s is not nil, not injecting", fieldName)
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continue
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}
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if k == reflect.Ptr && ot.Kind() == reflect.Struct {
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logrus.Debugf("[injection] found ptr + struct, injecting field %s to %T", fieldName, obj)
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fv.Set(reflect.ValueOf(obj).Addr())
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} else {
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logrus.Debugf("[injection] injecting field %s to %T", fieldName, obj)
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fv.Set(reflect.ValueOf(obj))
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}
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}
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}
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case reflect.Interface:
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for oi := 0; oi < len(objects); oi++ {
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obj := objects[oi]
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if obj == nil {
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continue
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}
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objT := reflect.TypeOf(obj)
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logrus.Debugln(
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ft.PkgPath(),
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ft.Name(),
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objT, "implements", ft, "=", objT.Implements(ft),
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)
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if objT.Implements(ft) {
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fv.Set(reflect.ValueOf(obj))
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}
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}
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}
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}
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return nil
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}
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