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|
package encoder
import (
"context"
"fmt"
"reflect"
)
var (
Marshal func(interface{}) ([]byte, error)
Unmarshal func([]byte, interface{}) error
)
type FieldQuery struct {
Name string
Fields []*FieldQuery
hash string
}
func (q *FieldQuery) Hash() string {
if q.hash != "" {
return q.hash
}
b, _ := Marshal(q)
q.hash = string(b)
return q.hash
}
func (q *FieldQuery) MarshalJSON() ([]byte, error) {
if q.Name != "" {
if len(q.Fields) > 0 {
return Marshal(map[string][]*FieldQuery{q.Name: q.Fields})
}
return Marshal(q.Name)
}
return Marshal(q.Fields)
}
func (q *FieldQuery) QueryString() (FieldQueryString, error) {
b, err := Marshal(q)
if err != nil {
return "", err
}
return FieldQueryString(b), nil
}
type FieldQueryString string
func (s FieldQueryString) Build() (*FieldQuery, error) {
var query interface{}
if err := Unmarshal([]byte(s), &query); err != nil {
return nil, err
}
return s.build(reflect.ValueOf(query))
}
func (s FieldQueryString) build(v reflect.Value) (*FieldQuery, error) {
switch v.Type().Kind() {
case reflect.String:
return s.buildString(v)
case reflect.Map:
return s.buildMap(v)
case reflect.Slice:
return s.buildSlice(v)
case reflect.Interface:
return s.build(reflect.ValueOf(v.Interface()))
}
return nil, fmt.Errorf("failed to build field query")
}
func (s FieldQueryString) buildString(v reflect.Value) (*FieldQuery, error) {
b := []byte(v.String())
switch b[0] {
case '[', '{':
var query interface{}
if err := Unmarshal(b, &query); err != nil {
return nil, err
}
if str, ok := query.(string); ok {
return &FieldQuery{Name: str}, nil
}
return s.build(reflect.ValueOf(query))
}
return &FieldQuery{Name: string(b)}, nil
}
func (s FieldQueryString) buildSlice(v reflect.Value) (*FieldQuery, error) {
fields := make([]*FieldQuery, 0, v.Len())
for i := 0; i < v.Len(); i++ {
def, err := s.build(v.Index(i))
if err != nil {
return nil, err
}
fields = append(fields, def)
}
return &FieldQuery{Fields: fields}, nil
}
func (s FieldQueryString) buildMap(v reflect.Value) (*FieldQuery, error) {
keys := v.MapKeys()
if len(keys) != 1 {
return nil, fmt.Errorf("failed to build field query object")
}
key := keys[0]
if key.Type().Kind() != reflect.String {
return nil, fmt.Errorf("failed to build field query. invalid object key type")
}
name := key.String()
def, err := s.build(v.MapIndex(key))
if err != nil {
return nil, err
}
return &FieldQuery{
Name: name,
Fields: def.Fields,
}, nil
}
type queryKey struct{}
func FieldQueryFromContext(ctx context.Context) *FieldQuery {
query := ctx.Value(queryKey{})
if query == nil {
return nil
}
q, ok := query.(*FieldQuery)
if !ok {
return nil
}
return q
}
func SetFieldQueryToContext(ctx context.Context, query *FieldQuery) context.Context {
return context.WithValue(ctx, queryKey{}, query)
}
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