/
encoding.go
110 lines (97 loc) · 3.61 KB
/
encoding.go
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// Copyright (c) 2017-2020 Uber Technologies Inc.
//
// 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.
package internal
import (
"bytes"
"encoding/json"
"fmt"
"io"
"reflect"
"github.com/apache/thrift/lib/go/thrift"
"go.uber.org/cadence/internal/common"
)
// encoding is capable of encoding and decoding objects
type encoding interface {
Marshal([]interface{}) ([]byte, error)
Unmarshal([]byte, []interface{}) error
}
// jsonEncoding encapsulates json encoding and decoding
type jsonEncoding struct {
}
// Marshal encodes an array of object into bytes
func (g jsonEncoding) Marshal(objs []interface{}) ([]byte, error) {
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
for i, obj := range objs {
if err := enc.Encode(obj); err != nil {
if err == io.EOF {
return nil, fmt.Errorf("missing argument at index %d of type %T", i, obj)
}
return nil, fmt.Errorf(
"unable to encode argument: %d, %v, with json error: %v", i, reflect.TypeOf(obj), err)
}
}
return buf.Bytes(), nil
}
// Unmarshal decodes a byte array into the passed in objects
func (g jsonEncoding) Unmarshal(data []byte, objs []interface{}) error {
dec := json.NewDecoder(bytes.NewBuffer(data))
dec.UseNumber()
for i, obj := range objs {
if err := dec.Decode(obj); err != nil {
return fmt.Errorf(
"unable to decode argument: %d, %v, with json error: %v", i, reflect.TypeOf(obj), err)
}
}
return nil
}
// thriftEncoding encapsulates thrift serializer/de-serializer.
type thriftEncoding struct{}
// Marshal encodes an array of thrift into bytes
func (g thriftEncoding) Marshal(objs []interface{}) ([]byte, error) {
var tlist []thrift.TStruct
for i := 0; i < len(objs); i++ {
if !common.IsThriftType(objs[i]) {
return nil, fmt.Errorf("pointer to thrift.TStruct type is required for %v argument", i+1)
}
t := reflect.ValueOf(objs[i]).Interface().(thrift.TStruct)
tlist = append(tlist, t)
}
return common.TListSerialize(tlist)
}
// Unmarshal decodes an array of thrift into bytes
func (g thriftEncoding) Unmarshal(data []byte, objs []interface{}) error {
var tlist []thrift.TStruct
for i := 0; i < len(objs); i++ {
rVal := reflect.ValueOf(objs[i])
if rVal.Kind() != reflect.Ptr || !common.IsThriftType(reflect.Indirect(rVal).Interface()) {
return fmt.Errorf("pointer to pointer thrift.TStruct type is required for %v argument", i+1)
}
t := reflect.New(rVal.Elem().Type().Elem()).Interface().(thrift.TStruct)
tlist = append(tlist, t)
}
if err := common.TListDeserialize(tlist, data); err != nil {
return err
}
for i := 0; i < len(tlist); i++ {
reflect.ValueOf(objs[i]).Elem().Set(reflect.ValueOf(tlist[i]))
}
return nil
}