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model.go
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model.go
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package xopbase
import (
"bytes"
"encoding/csv"
"encoding/json"
"encoding/xml"
"fmt"
"reflect"
"github.com/xoplog/xop-go/xopproto"
"github.com/xoplog/xop-go/xoputil"
"github.com/muir/list"
)
// ModelArg may be expanded in the future to supply: an Encoder; redaction
// information.
type ModelArg struct {
// If specified, overrides what would be provided by reflect.TypeOf(obj).Name()
// Encoding and Encoded can be set for models that are already encoded. If they're
// set, then Model will be ignored.
Encoding xopproto.Encoding `json:"encoding"`
Encoded []byte `json:"v"`
ModelType string `json:"modelType"`
Model interface{} `json:"-"`
}
func (m ModelArg) Copy() ModelArg {
m.Encoded = list.Copy(m.Encoded)
return m
}
// Calls to Encode are idempotent but not thread-safe
func (m *ModelArg) Encode() {
if m.ModelType == "" && m.Model != nil {
m.ModelType = reflect.TypeOf(m.Model).String()
}
if len(m.Encoded) != 0 {
return
}
switch m.Encoding {
case xopproto.Encoding_Unset:
m.Encoding = xopproto.Encoding_JSON
fallthrough
case xopproto.Encoding_JSON:
enc, err := json.Marshal(m.Model)
if err != nil {
m.Encoded = []byte(err.Error())
m.Encoding = xopproto.Encoding_ErrorMessage
} else {
m.Encoded = enc
}
case xopproto.Encoding_XML:
enc, err := xml.Marshal(m.Model)
if err != nil {
m.Encoded = []byte(err.Error())
m.Encoding = xopproto.Encoding_ErrorMessage
} else {
m.Encoded = enc
}
case xopproto.Encoding_CSV:
switch t := m.Model.(type) {
case SimpleTable:
var b bytes.Buffer
w := csv.NewWriter(&b)
err := w.Write(t.Header())
if err != nil {
m.Encoded = []byte(err.Error())
m.Encoding = xopproto.Encoding_ErrorMessage
return
}
err = w.WriteAll(t.Rows())
if err != nil {
m.Encoded = []byte(err.Error())
m.Encoding = xopproto.Encoding_ErrorMessage
return
}
m.Encoded = b.Bytes()
default:
m.Encoded = []byte(fmt.Sprintf("do not know how to turn %T into a CSV", m.Model))
m.Encoding = xopproto.Encoding_ErrorMessage
}
case xopproto.Encoding_ErrorMessage:
m.Encoded = []byte("Error is not a valid encoding")
default:
m.Encoded = []byte(fmt.Sprintf("unknown encoding %s", m.Encoding))
m.Encoding = xopproto.Encoding_ErrorMessage
}
}
type SimpleTable interface {
Header() []string
Rows() [][]string
}
var _ json.Marshaler = ModelArg{}
var _ json.Unmarshaler = &ModelArg{}
func (m ModelArg) MarshalJSON() ([]byte, error) {
m.Encode()
b := xoputil.JBuilder{
B: make([]byte, 0, len(m.Encoded)+len(m.ModelType)+30),
FastKeys: true,
}
b.AppendBytes([]byte(`{"v":`))
if m.Encoding == xopproto.Encoding_JSON {
b.AppendBytes(m.Encoded)
} else {
b.AddString(string(m.Encoded))
b.AppendBytes([]byte(`,"encoding":`))
b.AddSafeString(m.Encoding.String())
}
b.AppendBytes([]byte(`,"modelType":`))
b.AddString(m.ModelType)
b.AppendByte('}')
return b.B, nil
}
func (m *ModelArg) UnmarshalJSON(b []byte) error {
var decode struct {
Encoding xopproto.Encoding `json:"encoding"`
Encoded json.RawMessage `json:"v"`
ModelType string `json:"modelType"`
}
err := json.Unmarshal(b, &decode)
if err != nil {
return err
}
m.Encoded = []byte(decode.Encoded)
m.Model = nil
if decode.Encoding == xopproto.Encoding_Unset {
m.Encoding = xopproto.Encoding_JSON
} else {
m.Encoding = decode.Encoding
}
return nil
}
func (m *ModelArg) DecodeTo(dest any) error {
m.Encode()
switch m.Encoding {
case xopproto.Encoding_JSON:
return json.Unmarshal(m.Encoded, dest)
case xopproto.Encoding_XML:
return xml.Unmarshal(m.Encoded, dest)
default:
return fmt.Errorf("do not not how to decode %s", m.Encoding)
}
}