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annotate controllers/json.go @ 240:9012e4045da4

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Implemented /user delete controller.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 26 Jul 2018 17:56:02 +0200
parents 713234a04a87
children 3b688fe04c39
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3771788d3dae Reduce boilerplate code when writing JSON parsing/generating endpoints.
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1 package controllers
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2
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3 import (
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4 "database/sql"
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5 "encoding/json"
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6 "fmt"
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7 "log"
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8 "net/http"
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9
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10 "gemma.intevation.de/gemma/auth"
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11 "github.com/jackc/pgx"
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12 )
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13
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14 type JSONResult struct {
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15 Code int
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16 Result interface{}
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17 }
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18
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19 type JSONHandler struct {
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20 Input func() interface{}
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21 Handle func(http.ResponseWriter, *http.Request, interface{}, *sql.DB) (JSONResult, error)
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22 }
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23
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24 type JSONError struct {
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25 Code int
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26 Message string
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27 }
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29 func (je JSONError) Error() string {
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30 return fmt.Sprintf("%d: %s", je.Code, je.Message)
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31 }
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32
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33 func (j *JSONHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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34
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35 var input interface{}
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36 if j.Input != nil {
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37 input = j.Input()
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38 defer req.Body.Close()
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39 if err := json.NewDecoder(req.Body).Decode(input); err != nil {
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40 http.Error(rw, "error: "+err.Error(), http.StatusBadRequest)
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41 return
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42 }
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43 }
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44
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45 token, _ := auth.GetToken(req)
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46 var jr JSONResult
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47 err := auth.ConnPool.Do(token, func(db *sql.DB) (err error) {
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48 jr, err = j.Handle(rw, req, input, db)
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49 return err
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50 })
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51
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52 if err != nil {
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53 switch e := err.(type) {
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54 case pgx.PgError:
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55 var res = struct {
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56 Result string `json:"result"`
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57 Code string `json:"code,omitempty"`
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58 Message string `json:"message,omitempty"`
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59 }{
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60 Result: "failure",
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61 Code: e.Code,
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62 Message: e.Message,
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63 }
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64 rw.Header().Set("Content-Type", "application/json")
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65 rw.WriteHeader(http.StatusInternalServerError)
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66 if err := json.NewEncoder(rw).Encode(&res); err != nil {
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67 log.Printf("error: %v\n", err)
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68 }
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69 case JSONError:
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70 rw.Header().Set("Content-Type", "application/json")
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71 rw.WriteHeader(http.StatusInternalServerError)
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72 var res = struct {
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73 Message string `json:"message"`
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74 }{
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75 Message: e.Message,
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76 }
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77 if err := json.NewEncoder(rw).Encode(&res); err != nil {
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78 log.Printf("error: %v\n", err)
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79 }
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80 default:
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81 log.Printf("err: %v\n", err)
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82 http.Error(rw,
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83 "error: "+err.Error(),
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84 http.StatusInternalServerError)
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85 }
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86 return
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87 }
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88
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89 if jr.Code == 0 {
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90 jr.Code = http.StatusOK
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91 }
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92
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93 if jr.Code != http.StatusNoContent {
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94 rw.Header().Set("Content-Type", "application/json")
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95 }
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96 rw.WriteHeader(jr.Code)
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97 if jr.Code != http.StatusNoContent {
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98 if err := json.NewEncoder(rw).Encode(jr.Result); err != nil {
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99 log.Printf("error: %v\n", err)
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100 }
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101 }
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102 }