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Commit | Line | Data |
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7a9e5112 | 1 | package api |
2 | ||
3 | import ( | |
4 | "net/http" | |
5 | "unicode" | |
6 | ||
7 | "github.com/gin-gonic/gin" | |
8 | ) | |
9 | ||
10 | type Error struct { | |
11 | Code ErrorCode | |
12 | UserMessage string | |
13 | err error | |
14 | } | |
15 | ||
16 | func (e Error) Err() error { | |
17 | if e.err != nil { | |
18 | return e | |
19 | } | |
20 | ||
21 | return nil | |
22 | } | |
23 | ||
24 | func (e Error) Error() string { | |
25 | if e.err != nil { | |
26 | return e.err.Error() | |
27 | } | |
28 | ||
29 | return "" | |
30 | } | |
31 | ||
32 | func NewInternalError(err error) *Error { | |
33 | return &Error{InternalError, "internal error", err} | |
34 | } | |
35 | ||
36 | func ToSnake(in string) string { | |
37 | runes := []rune(in) | |
38 | length := len(runes) | |
39 | ||
40 | var out []rune | |
41 | for i := 0; i < length; i++ { | |
42 | if i > 0 && unicode.IsUpper(runes[i]) && ((i+1 < length && unicode.IsLower(runes[i+1])) || unicode.IsLower(runes[i-1])) { | |
43 | out = append(out, '_') | |
44 | } | |
45 | out = append(out, unicode.ToLower(runes[i])) | |
46 | } | |
47 | ||
48 | return string(out) | |
49 | } | |
50 | ||
51 | type Response struct { | |
52 | StatusCode Status `json:"-"` | |
53 | ErrorCode ErrorCode `json:"-"` | |
54 | ||
55 | Status string `json:"status"` | |
56 | Code string `json:"code,omitempty"` | |
57 | Response interface{} `json:"response,omitempty"` | |
58 | Message string `json:"message,omitempty"` | |
59 | } | |
60 | ||
61 | func (r Response) populateStatus() Response { | |
62 | r.Status = ToSnake(r.StatusCode.String()) | |
63 | ||
64 | if r.ErrorCode != 0 { | |
65 | r.Code = ToSnake(r.ErrorCode.String()) | |
66 | } | |
67 | ||
68 | return r | |
69 | } | |
70 | ||
71 | func ErrorResponse(code ErrorCode, message string) Response { | |
72 | return Response{ | |
73 | StatusCode: NOK, | |
74 | ErrorCode: code, | |
75 | Message: message, | |
76 | } | |
77 | } | |
78 | ||
79 | func SuccessResponse(data interface{}) Response { | |
80 | return Response{ | |
81 | StatusCode: OK, | |
82 | Response: data, | |
83 | } | |
84 | } | |
85 | ||
86 | func WriteJsonResponse(response Response, c *gin.Context) { | |
87 | response = response.populateStatus() | |
88 | ||
89 | c.JSON(StatusToHttpCode(response.StatusCode, response.ErrorCode), response) | |
90 | } | |
91 | ||
92 | func WriteBinary(contentType string, b []byte, c *gin.Context) { | |
93 | c.Data(http.StatusOK, contentType, b) | |
94 | } | |
95 | ||
96 | type Middleware func(*gin.Context) *Error | |
97 | ||
98 | func M(handler Middleware) gin.HandlerFunc { | |
99 | return func(c *gin.Context) { | |
100 | err := handler(c) | |
101 | ||
102 | if err != nil { | |
103 | WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c) | |
104 | c.Error(err) | |
105 | c.Abort() | |
106 | } else { | |
107 | c.Next() | |
108 | } | |
109 | } | |
110 | } | |
111 | ||
112 | type Query interface { | |
113 | ValidateParams() *Error | |
114 | Run() (interface{}, *Error) | |
115 | } | |
116 | ||
117 | func RunQuery(query Query, c *gin.Context) { | |
118 | if err := query.ValidateParams(); err != nil { | |
119 | WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c) | |
120 | c.Error(err) | |
121 | return | |
122 | } | |
123 | ||
124 | if out, err := query.Run(); err != nil { | |
125 | WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c) | |
126 | c.Error(err) | |
127 | } else { | |
128 | WriteJsonResponse(SuccessResponse(out), c) | |
129 | } | |
130 | } |