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/
proto.go
143 lines (126 loc) · 2.92 KB
/
proto.go
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package proto
import (
"encoding/json"
"io"
"io/ioutil"
"mime"
"mime/multipart"
"net/http"
"strings"
"github.com/pkg/errors"
uuid "github.com/satori/go.uuid"
"github.com/tidwall/gjson"
)
var (
ErrEmptyBody = errors.New("empty body")
)
type MessageHeader struct {
Namespace string `json:"namespace"`
Name string `json:"name"`
MessageId string `json:"messageId"`
DialogRequestId string `json:"dialogRequestId"`
}
type Message struct {
Header MessageHeader `json:"header"`
Payload interface{} `json:"payload"`
PayloadJSON gjson.Result `json:"-"`
Attach io.ReadCloser `json:"-"`
}
func NewMessage(name string, payload interface{}) *Message {
i := strings.LastIndex(name, ".")
namespace := name[:i]
nam := name[i+1:]
m := &Message{
Header: MessageHeader{
Namespace: namespace,
Name: nam,
MessageId: uuid.NewV4().String(),
},
Payload: payload,
}
return m
}
func (m *Message) UnmarshalJSON(b []byte) error {
root := gjson.ParseBytes(b)
err := json.Unmarshal([]byte(root.Get("header").Raw), &m.Header)
if err != nil {
return err
}
m.PayloadJSON = root.Get("payload")
if m.Payload != nil {
err = json.Unmarshal([]byte(m.PayloadJSON.Raw), m.Payload)
if err != nil {
return err
}
}
return nil
}
type ResponseReader struct {
*http.Response
r *multipart.Reader
}
func NewResponseReader(resp *http.Response) (*ResponseReader, error) {
if resp.StatusCode == 204 {
return nil, ErrEmptyBody
}
if resp.StatusCode != http.StatusOK {
return nil, errors.New(resp.Status)
}
ctype := resp.Header.Get("Content-Type")
ctype = strings.Replace(ctype, "/json", "-json", -1)
mtype, params, err := mime.ParseMediaType(ctype)
if err != nil {
return nil, err
}
if !strings.HasPrefix(mtype, "multipart/") {
return nil, errors.Errorf("bad content-type:%s", ctype)
}
boundary := params["boundary"]
r := multipart.NewReader(resp.Body, boundary)
return &ResponseReader{
Response: resp,
r: r,
}, nil
}
func (r *ResponseReader) ReadJSON() (*gjson.Result, error) {
p, err := r.r.NextPart()
if err != nil {
return nil, err
}
defer p.Close()
mtype, _, err := mime.ParseMediaType(p.Header.Get("Content-Type"))
if err != nil {
return nil, err
}
if mtype != "application/json" {
return nil, errors.Errorf("application/json mime type expceted, actual:%s", mtype)
}
buf, err := ioutil.ReadAll(p)
if err != nil {
return nil, err
}
result := gjson.ParseBytes(buf)
return &result, nil
}
func (r *ResponseReader) ReadDirective() (*Message, error) {
root, err := r.ReadJSON()
if err != nil {
return nil, err
}
m := new(Message)
err = json.Unmarshal([]byte(root.Get("directive").Raw), m)
if err != nil {
return nil, err
}
return m, nil
}
func (r *ResponseReader) ReadAttach() (io.ReadCloser, error) {
p, err := r.r.NextPart()
if err != nil {
return nil, err
}
return p, nil
}
func (r *ResponseReader) Close() error {
return r.Body.Close()
}