Mercurial > gemma

annotate pkg/geoserver/templates.go @ 4285:6b415dcdaf8a

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Let the geoserver expose primary keys for features.
author Raimund Renkert <raimund@renkert.org>
date Fri, 30 Aug 2019 09:29:19 +0200
parents 152b9eb5ca47
children 124a5a7fe8d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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) 2019 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 // * Markus Kottländer <markus.kottlaender@intevation.de>
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14
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15 package geoserver
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16
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17 import (
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18 "context"
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19 "database/sql"
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20 "regexp"
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21 "strings"
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22 "text/template"
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23
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24 "gemma.intevation.de/gemma/pkg/auth"
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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 (
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29 selectConfigValSQL = `
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30 SELECT config_val FROM sys_admin.system_config
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31 WHERE config_key = $1`
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32 )
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33
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34 func init() {
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35 RegisterStylePreprocessor(
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36 "sounding_results_contour_lines_geoserver",
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37 templateContourLinesFunc("morphology_classbreaks"))
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38 RegisterStylePreprocessor(
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39 "sounding_differences",
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40 templateContourLinesFunc("morphology_classbreaks_compare"))
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41 RegisterStylePreprocessor(
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42 "distance_marks_geoserver",
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43 templateConfigValues)
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44 RegisterStylePreprocessor(
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45 "distance_marks_ashore_geoserver",
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46 templateConfigValues)
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47 RegisterStylePreprocessor(
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48 "waterway_area",
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49 templateConfigValues)
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50 RegisterStylePreprocessor(
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51 "waterway_axis",
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52 templateConfigValues)
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53 // TODO: Add more layers.
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54 }
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55
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56 func templateConfigValues(tmplTxt string) (string, error) {
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57 tmpl, err := template.New("template").Parse(tmplTxt)
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58 if err != nil {
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59 return "", err
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60 }
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61
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62 // Try to extract the needed keys from the template.
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63 keys := extractKeysFromTemplate(tmplTxt)
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64 kv, err := loadConfigValues(keys)
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65 if err != nil {
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66 return "", err
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67 }
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68
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69 var buf strings.Builder
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70 if err = tmpl.Execute(&buf, kv); err != nil {
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71 return "", err
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72 }
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73 return buf.String(), nil
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74
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75 }
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76
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77 // TODO: Use the parse tree of the template to extract keys.
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78 var findKeysRe = regexp.MustCompile(`{{[-]?\s*\.([^-.\s]+)\s*[-]?}}`)
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79
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80 func extractKeysFromTemplate(tmpl string) []string {
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81 parts := findKeysRe.FindAllStringSubmatch(tmpl, -1)
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82 keys := make(map[string]struct{})
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83 for _, part := range parts {
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84 keys[part[1]] = struct{}{}
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85 }
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86 out := make([]string, len(keys))
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87 var i int
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88 for key := range keys {
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89 out[i] = key
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90 i++
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91 }
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92 return out
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93 }
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94
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95 func loadConfigValues(keys []string) (map[string]string, error) {
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96 kv := make(map[string]string, len(keys))
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97 if len(keys) == 0 {
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98 return kv, nil
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99 }
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100 ctx := context.Background()
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101 if err := auth.RunAs(
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102 ctx,
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103 "sys_admin",
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104 func(conn *sql.Conn) error {
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105 stmt, err := conn.PrepareContext(ctx, selectConfigValSQL)
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106 if err != nil {
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107 return err
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108 }
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109 defer stmt.Close()
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110 for _, key := range keys {
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111 var val string
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112 if err := stmt.QueryRowContext(ctx, key).Scan(&val); err != nil {
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113 return err
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114 }
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115 kv[key] = val
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116 }
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117 return nil
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118 },
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119 ); err != nil {
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120 return nil, err
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121 }
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122
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123 return kv, nil
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124 }
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125
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126 func templateContourLinesFunc(configKey string) func(string) (string, error) {
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127 return func(data string) (string, error) {
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128 return templateContourLines(data, configKey)
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129 }
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130 }
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131
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132 func templateContourLines(data, configKey string) (string, error) {
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133 tmpl, err := template.New("template").Parse(data)
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134 if err != nil {
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135 return "", err
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136 }
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137
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138 var cb []models.ClassBreak
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139
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140 if cb, err = countourLinesClassBreaks(configKey); err != nil {
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141 return "", err
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142 }
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143
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144 var buf strings.Builder
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145 if err = tmpl.Execute(&buf, cb); err != nil {
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146 return "", err
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147 }
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148 return buf.String(), nil
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149 }
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150
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151 func countourLinesClassBreaks(configKey string) ([]models.ClassBreak, error) {
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152
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153 var config string
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154 ctx := context.Background()
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155 if err := auth.RunAs(
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156 ctx,
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157 "sys_admin",
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158 func(conn *sql.Conn) error {
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159 return conn.QueryRowContext(
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160 ctx,
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161 selectConfigValSQL,
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162 configKey,
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163 ).Scan(&config)
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164 },
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165 ); err != nil {
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166 return nil, err
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167 }
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168
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169 cc, err := models.ParseColorValues(config)
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170 if err != nil {
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171 return nil, err
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172 }
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173
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174 return cc.ClassBreaks(), nil
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175 }