Mercurial > gemma
annotate pkg/controllers/printtemplates.go @ 2158:7bd485bf85e8
Print templates: Implemented /api/templates/print POST to create new templates.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 08 Feb 2019 12:50:40 +0100 |
parents | 51c5aead78c0 |
children | 7444b75d5497 |
rev | line source |
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package controllers |
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15 |
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16 import ( |
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17 "bytes" |
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18 "database/sql" |
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19 "net/http" |
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20 "time" |
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21 |
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22 "github.com/gorilla/mux" |
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23 "github.com/jackc/pgx/pgtype" |
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24 |
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25 "gemma.intevation.de/gemma/pkg/models" |
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26 ) |
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27 |
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28 const maxPrintTemplateSize = 5 * 1024 * 1024 |
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29 |
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30 const ( |
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31 listPrintTemplatesSQL = ` |
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32 SELECT |
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33 template_name, |
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34 date_info |
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35 FROM |
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36 users.templates |
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37 ORDER BY date_info DESC` |
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38 |
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39 hasPrintTemplateSQL = ` |
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40 SELECT true FROM users.templates WHERE name = $1` |
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41 |
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42 deletePrintTemplateSQL = ` |
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43 DELETE FROM users.templates WHERE name = $1` |
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44 |
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45 selectPrintTemplateSQL = ` |
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46 SELECT template_data FROM users.templates WHERE name = $1` |
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47 |
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48 insertPrintTemplateSQL = ` |
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49 INSERT INTO users.templates (template_name, template_data) |
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50 VALUES ($1, $2)` |
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51 ) |
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52 |
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53 func listPrintTemplates( |
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54 _ interface{}, |
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55 req *http.Request, |
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56 conn *sql.Conn, |
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57 ) (jr JSONResult, err error) { |
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58 |
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59 type template struct { |
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60 Name string `json:"name"` |
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61 Time models.Time `json:"time"` |
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62 } |
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63 |
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64 var rows *sql.Rows |
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65 if rows, err = conn.QueryContext(req.Context(), listPrintTemplatesSQL); err != nil { |
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66 return |
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67 } |
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68 defer rows.Close() |
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69 |
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70 templates := []*template{} |
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71 |
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72 for rows.Next() { |
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73 var tmpl template |
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74 var w time.Time |
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75 if err = rows.Scan(&tmpl.Name, &w); err != nil { |
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76 return |
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77 } |
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78 tmpl.Time = models.Time{w} |
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79 templates = append(templates, &tmpl) |
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80 } |
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81 |
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82 jr = JSONResult{Result: templates} |
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83 return |
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84 } |
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85 |
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86 func fetchPrintTemplate( |
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87 _ interface{}, |
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88 req *http.Request, |
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89 conn *sql.Conn, |
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90 ) (jr JSONResult, err error) { |
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91 |
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92 ctx := req.Context() |
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93 name := mux.Vars(req)["name"] |
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94 |
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95 var data pgtype.Bytea |
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96 err = conn.QueryRowContext(ctx, selectPrintTemplateSQL, name).Scan(&data) |
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97 |
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98 switch { |
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99 case err == sql.ErrNoRows: |
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100 err = JSONError{ |
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101 Code: http.StatusNotFound, |
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102 Message: "No such template found", |
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103 } |
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104 return |
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105 case err != nil: |
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106 return |
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107 case data.Status != pgtype.Present: |
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108 err = JSONError{ |
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109 Code: http.StatusInternalServerError, |
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110 Message: "Unexpected return value from database query", |
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111 } |
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112 return |
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113 } |
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114 jr = JSONResult{Result: bytes.NewReader(data.Bytes)} |
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115 return |
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116 } |
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117 |
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118 func createPrintTemplate( |
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119 input interface{}, |
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120 req *http.Request, |
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121 conn *sql.Conn, |
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122 ) (jr JSONResult, err error) { |
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123 |
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124 ctx := req.Context() |
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125 in := input.(*models.PrintTemplateIn) |
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126 |
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127 if in.Name == "" { |
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128 err = JSONError{ |
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129 Code: http.StatusBadRequest, |
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130 Message: "Template must have a none empty name", |
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131 } |
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132 return |
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133 } |
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134 if len(in.Template) == 0 { |
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135 err = JSONError{ |
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136 Code: http.StatusBadRequest, |
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137 Message: "Template must have a none empty template", |
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138 } |
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139 return |
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140 } |
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141 var tx *sql.Tx |
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142 if tx, err = conn.BeginTx(ctx, nil); err != nil { |
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143 return |
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144 } |
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145 defer tx.Rollback() |
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146 |
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147 var dummy bool |
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148 err = tx.QueryRowContext(ctx, hasPrintTemplateSQL, in.Name).Scan(&dummy) |
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149 |
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150 switch { |
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151 case err == sql.ErrNoRows: |
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152 // This is fine. |
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153 case err != nil: |
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154 return |
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155 default: |
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156 err = JSONError{ |
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157 Code: http.StatusBadRequest, |
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158 Message: "A template with this name already exists", |
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159 } |
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160 return |
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161 } |
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162 data := pgtype.Bytea{Bytes: in.Template, Status: pgtype.Present} |
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163 |
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164 if _, err = tx.ExecContext(ctx, insertPrintTemplateSQL, in.Name, &data); err != nil { |
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165 return |
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166 } |
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167 |
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168 if err = tx.Commit(); err != nil { |
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169 return |
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170 } |
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171 jr = JSONResult{ |
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172 Code: http.StatusCreated, |
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173 Result: map[string]string{ |
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174 "created": in.Name, |
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175 }, |
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176 } |
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177 return |
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178 } |
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179 |
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180 func deletePrintTemplate( |
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181 _ interface{}, |
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182 req *http.Request, |
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183 conn *sql.Conn, |
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184 ) (jr JSONResult, err error) { |
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185 |
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186 ctx := req.Context() |
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187 name := mux.Vars(req)["name"] |
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188 |
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189 var tx *sql.Tx |
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190 if tx, err = conn.BeginTx(ctx, nil); err != nil { |
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191 return |
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192 } |
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193 defer tx.Rollback() |
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194 |
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195 var dummy bool |
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196 err = tx.QueryRowContext(ctx, hasPrintTemplateSQL, name).Scan(&dummy) |
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197 |
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198 switch { |
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199 case err == sql.ErrNoRows: |
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200 err = JSONError{ |
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201 Code: http.StatusNotFound, |
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202 Message: "No such template found", |
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203 } |
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204 return |
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205 case err != nil: |
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206 return |
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207 case !dummy: |
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208 err = JSONError{ |
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209 Code: http.StatusInternalServerError, |
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210 Message: "Unexpected return value from database query", |
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211 } |
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212 return |
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213 } |
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214 |
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215 if _, err = tx.ExecContext(ctx, deletePrintTemplateSQL, name); err != nil { |
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216 return |
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217 } |
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218 |
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219 if err = tx.Commit(); err != nil { |
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220 return |
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221 } |
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222 |
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223 jr = JSONResult{ |
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224 Result: map[string]string{ |
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225 "deleted": name, |
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226 }, |
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227 } |
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228 |
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229 return |
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230 } |
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231 |
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232 func updatePrintTemplate( |
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233 _ interface{}, |
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234 req *http.Request, |
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235 conn *sql.Conn, |
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236 ) (jr JSONResult, err error) { |
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237 // TODO: Implement me! |
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238 return |
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239 } |