1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
package api
import (
"net/http"
"unicode"
"github.com/gin-gonic/gin"
)
type Error struct {
Code ErrorCode
UserMessage string
err error
}
func (e Error) Err() error {
if e.err != nil {
return e
}
return nil
}
func (e Error) Error() string {
if e.err != nil {
return e.err.Error()
}
return ""
}
func NewInternalError(err error) *Error {
return &Error{InternalError, "internal error", err}
}
func ToSnake(in string) string {
runes := []rune(in)
length := len(runes)
var out []rune
for i := 0; i < length; i++ {
if i > 0 && unicode.IsUpper(runes[i]) && ((i+1 < length && unicode.IsLower(runes[i+1])) || unicode.IsLower(runes[i-1])) {
out = append(out, '_')
}
out = append(out, unicode.ToLower(runes[i]))
}
return string(out)
}
type Response struct {
StatusCode Status `json:"-"`
ErrorCode ErrorCode `json:"-"`
Status string `json:"status"`
Code string `json:"code,omitempty"`
Response interface{} `json:"response,omitempty"`
Message string `json:"message,omitempty"`
}
func (r Response) populateStatus() Response {
r.Status = ToSnake(r.StatusCode.String())
if r.ErrorCode != 0 {
r.Code = ToSnake(r.ErrorCode.String())
}
return r
}
func ErrorResponse(code ErrorCode, message string) Response {
return Response{
StatusCode: NOK,
ErrorCode: code,
Message: message,
}
}
func SuccessResponse(data interface{}) Response {
return Response{
StatusCode: OK,
Response: data,
}
}
func WriteJsonResponse(response Response, c *gin.Context) {
response = response.populateStatus()
c.JSON(StatusToHttpCode(response.StatusCode, response.ErrorCode), response)
}
func WriteBinary(contentType string, b []byte, c *gin.Context) {
c.Data(http.StatusOK, contentType, b)
}
type Middleware func(*gin.Context) *Error
func M(handler Middleware) gin.HandlerFunc {
return func(c *gin.Context) {
err := handler(c)
if err != nil {
WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c)
c.Error(err)
c.Abort()
} else {
c.Next()
}
}
}
type Query interface {
ValidateParams() *Error
Run() (interface{}, *Error)
}
func RunQuery(query Query, c *gin.Context) {
if err := query.ValidateParams(); err != nil {
WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c)
c.Error(err)
return
}
if out, err := query.Run(); err != nil {
WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c)
c.Error(err)
} else {
WriteJsonResponse(SuccessResponse(out), c)
}
}
|
