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parse.go
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parse.go
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package inspect
import (
"encoding/json"
"errors"
"fmt"
"reflect"
"strings"
)
func Convert(i1 interface{}, i2 interface{}) error {
b, err := json.Marshal(i1)
if err != nil {
return err
}
return json.Unmarshal(b, i2)
}
func ConvertJSON(b []byte) (map[string]interface{}, error) {
response := make(map[string]interface{})
if len(b) != 0 {
if err := json.Unmarshal(b, &response); err != nil {
return nil, err
}
}
return response, nil
}
// Source will copy values from settings to the given interface for
// all fields that are setup with json serialization in i.
// It's a shallow copy and i needs to be a struct or a pointer to a struct.
func Source(i interface{}, settings map[string]interface{}) error {
v := reflect.ValueOf(i)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return errors.New("can only source structs")
}
t := v.Type()
for j := 0; j < t.NumField(); j++ {
f := t.Field(j)
s, ok := f.Tag.Lookup("json")
if !ok {
continue
}
p := strings.Index(s, ",")
if p > -1 {
s = s[:p]
}
setting, ok := settings[s]
if !ok {
continue
}
sv := reflect.ValueOf(setting)
switch sv.Kind() {
case reflect.Slice, reflect.Array:
av, e := toSpecificArray(sv, f.Type)
if e != nil {
return e
}
v.FieldByName(f.Name).Set(av)
default:
if !sv.Type().AssignableTo(f.Type) {
return fmt.Errorf("found unassignable type at %s, expected %v but found %v", f.Name, f.Type, sv.Type())
}
v.FieldByName(f.Name).Set(sv)
}
}
return nil
}
// Merge combines two maps. Keys in the second map override the ones in the first. Arrays are merged.
func Merge(a, b map[string]interface{}) map[string]interface{} {
result := make(map[string]interface{})
for k, av := range a {
ar := reflect.ValueOf(av)
if avm, ok := av.(map[string]interface{}); ok {
if bv, ok := b[k]; ok {
if bvm, ok := bv.(map[string]interface{}); ok {
result[k] = Merge(avm, bvm)
} else {
result[k] = bv
}
} else {
result[k] = av
}
} else if ar.Kind() == reflect.Slice {
if bv, ok := b[k]; ok {
br := reflect.ValueOf(bv)
if br.Kind() == reflect.Slice {
combined := reflect.MakeSlice(ar.Type(), 0, ar.Len())
for i := 0; i < ar.Len(); i++ {
combined = reflect.Append(combined, ar.Index(i))
}
for i := 0; i < br.Len(); i++ {
combined = reflect.Append(combined, br.Index(i))
}
result[k] = combined.Interface()
} else {
result[k] = bv
}
}
} else {
if bv, ok := b[k]; ok {
result[k] = bv
} else {
result[k] = av
}
}
}
for k, bv := range b {
if _, ok := a[k]; !ok {
result[k] = bv
}
}
return result
}
// toSpecificArray converts an array of one type to an array of a desired type if it's assignable.
func toSpecificArray(array reflect.Value, target reflect.Type) (reflect.Value, error) {
result := reflect.MakeSlice(reflect.SliceOf(target.Elem()), 0, array.Cap())
for i := 0; i < array.Len(); i++ {
v := array.Index(i)
// TODO: Fix the case when v is a struct, like for customResources in an account config
if v.Kind() == reflect.Interface || v.Kind() == reflect.Ptr {
v = v.Elem()
}
if !v.Type().AssignableTo(target.Elem()) {
return reflect.Value{}, fmt.Errorf("found unassignable type, expected %v but found %v", target.Elem(), v.Type())
}
result = reflect.Append(result, v)
}
return result, nil
}
type stringHandler func(val string) (string, error)
func InspectStrings(i interface{}, handler stringHandler) (interface{}, error) {
t, err := inspectStringReflect(reflect.ValueOf(i), handler)
return t.Interface(), err
}
func inspectStringReflect(v reflect.Value, stringHandler stringHandler) (reflect.Value, error) {
switch v.Kind() {
case reflect.Ptr:
rv, err := inspectStringReflect(v.Elem(), stringHandler)
if err != nil {
return v, err
}
eV := reflect.New(v.Elem().Type())
eV.Elem().Set(rv)
return eV, nil
case reflect.Struct:
nsv := reflect.New(v.Type())
for j := 0; j < v.NumField(); j++ {
f := v.Field(j)
rv, err := inspectStringReflect(f, stringHandler)
if err != nil {
return v, err
}
// Replace in the new struct
nf := nsv.Elem().Field(j)
if nf.CanAddr() {
nf.Set(rv)
} else {
return v, fmt.Errorf("unaddressable value found %v", nf)
}
}
return nsv.Elem(), nil
case reflect.String:
s, err := stringHandler(v.String())
if err != nil {
return v, err
}
return reflect.ValueOf(s), nil
case reflect.Slice, reflect.Array:
if v.Len() == 0 {
return v, nil
}
nsv := reflect.MakeSlice(v.Type(), v.Len(), v.Len())
for j := 0; j < v.Len(); j++ {
rv, err := inspectStringReflect(v.Index(j), stringHandler)
if err != nil {
return v, err
}
nsv.Index(j).Set(rv)
}
return nsv, nil
case reflect.Map:
nmv := reflect.MakeMap(v.Type())
keys := v.MapKeys()
for _, k := range keys {
rv, err := inspectStringReflect(v.MapIndex(k), stringHandler)
if err != nil {
return v, err
}
nmv.SetMapIndex(k, rv)
}
return nmv, nil
case reflect.Interface:
return inspectStringReflect(v.Elem(), stringHandler)
}
return v, nil
}