forked from metayd/qcloudapi-sdk-go
/
query.go
90 lines (83 loc) · 2.35 KB
/
query.go
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package common
import (
"errors"
"fmt"
"net/url"
"reflect"
"strings"
)
type QCloudArg interface {
EncodeStructWithPrefix(prefix string, val reflect.Value, v *url.Values) error
}
func EncodeStruct(i interface{}, v *url.Values) error {
val := reflect.ValueOf(i)
return encodeStructWithPrefix("", val, v)
}
func encodeStructWithPrefix(prefix string, val reflect.Value, v *url.Values) error {
if !reflect.Indirect(val).IsValid() {
val = reflect.New(val.Type().Elem())
}
qcloudArg, ok := val.Interface().(QCloudArg)
if ok {
return qcloudArg.EncodeStructWithPrefix(prefix, val, v)
}
switch val.Kind() {
case reflect.Struct:
{
typ := val.Type()
for index := 0; index < val.NumField(); index++ {
tag, opts := parseTag(typ.Field(index).Tag.Get("qcloud_arg"))
fieldVal := val.Field(index)
if fieldVal.Kind() == reflect.Ptr {
if fieldVal.IsNil() {
if opts.Contains("required") {
return errors.New(fmt.Sprintf("field %s of %s should not be nil", tag, typ))
}
continue
}
}
p := strings.Join([]string{prefix, tag}, ".")
if err := encodeStructWithPrefix(p, fieldVal, v); err != nil {
return err
}
}
}
case reflect.Array, reflect.Slice:
{
for index := 0; index < val.Len(); index++ {
p := strings.Join([]string{prefix, fmt.Sprint(index)}, ".")
if err := encodeStructWithPrefix(p, val.Index(index), v); err != nil {
return err
}
}
}
case reflect.Ptr, reflect.Interface:
if err := encodeStructWithPrefix(prefix, val.Elem(), v); err != nil {
return err
}
case reflect.String:
v.Set(strings.TrimLeft(prefix, "."), val.String())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
v.Set(strings.TrimLeft(prefix, "."), fmt.Sprint(val))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
v.Set(strings.TrimLeft(prefix, "."), fmt.Sprint(val))
case reflect.Float32, reflect.Float64:
v.Set(strings.TrimLeft(prefix, "."), fmt.Sprint(val))
case reflect.Bool:
v.Set(strings.TrimLeft(prefix, "."), fmt.Sprint(val))
}
return nil
}
type tagOptions []string
func (tOpts tagOptions) Contains(opt string) bool {
for _, o := range tOpts {
if o == opt {
return true
}
}
return false
}
func parseTag(tag string) (string, tagOptions) {
parts := strings.Split(tag, ",")
return parts[0], parts[1:]
}