Mercurial > gemma

annotate pkg/wfs/global.go @ 5710:37c8feeecb4d

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Merged branch sr-v2 into default.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 20 Feb 2024 21:28:56 +0100
parents 31973f6f5cca
children
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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
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14 package wfs
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15
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16 import (
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17 "bufio"
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18 "fmt"
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19 "io"
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20 "os"
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21 "os/exec"
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22 "path/filepath"
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23 "sync"
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24
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25 "gemma.intevation.de/gemma/pkg/config"
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26 "gemma.intevation.de/gemma/pkg/log"
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27 )
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28
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29 var (
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30 // FormatGeoJSON is a list of MIME types of
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31 // GeoJSON documents.
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32 FormatGeoJSON = []string{"geojson", "application/json"}
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33 // FormatGML is a list of MIME types
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34 // GML documents.
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35 FormatGML = []string{
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36 "application/gml+xml; version=3.2",
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37 "gml2", "gml3", "gml32",
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38 "text/xml; subtype=gml/2.1.2",
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39 "text/xml; subtype=gml/3.1.1",
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40 "text/xml; subtype=gml/3.2",
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41 }
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42 )
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43
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44 type (
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45 // Downloader abstracts the idea of a download function for WFS.
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46 Downloader interface {
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47 Download(user, password string, handler func(string, io.Reader) error) error
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48 }
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49
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50 // GeoJSONDownloader is a Downloader for GeoJSON.
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51 GeoJSONDownloader []string
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52 // GMLDownloader is a Downloader for GML.
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53 GMLDownloader []string
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54 )
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55
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56 var (
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57 getFeaturesOnce sync.Once
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58 getFeatures func(*Capabilities, string, string) (Downloader, error)
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59 )
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60
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61 func getFeaturesOnceFunc() {
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62 path, err := exec.LookPath("ogr2ogr")
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63 if err != nil {
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64 log.Infoln("ogr2ogr not installed. Using direct GeoJSON WFS download.")
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65 getFeatures = getFeaturesGeoJSON
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66 } else {
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67 log.Infof("ogr2ogr found at %s. Using GML WFS download.\n", path)
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68 getFeatures = getFeaturesGML
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69 }
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70 }
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71
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72 // GetFeatures is the default Downloader in this Gemma server.
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73 func GetFeatures(
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74 caps *Capabilities,
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75 featureTypeName string,
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76 sortBy string,
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77 ) (Downloader, error) {
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78 getFeaturesOnce.Do(getFeaturesOnceFunc)
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79 return getFeatures(caps, featureTypeName, sortBy)
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80 }
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81
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82 func getFeaturesGeoJSON(
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83 caps *Capabilities,
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84 featureTypeName string,
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85 sortBy string,
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86 ) (Downloader, error) {
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87 urls, err := GetFeaturesGET(
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88 caps,
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89 featureTypeName,
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90 FormatGeoJSON,
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91 sortBy)
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92 return GeoJSONDownloader(urls), err
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93 }
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94
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95 func getFeaturesGML(
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96 caps *Capabilities,
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97 featureTypeName string,
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98 sortBy string,
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99 ) (Downloader, error) {
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100 urls, err := GetFeaturesGET(
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101 caps,
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102 featureTypeName,
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103 FormatGML,
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104 sortBy)
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105 return GMLDownloader(urls), err
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106 }
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107
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108 // Download is the GeoJSON implementation of the Downloader.
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109 func (gjd GeoJSONDownloader) Download(user, password string, handler func(string, io.Reader) error) error {
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110 return DownloadURLs(user, password, []string(gjd), handler)
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111 }
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112
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113 func places(n int) int {
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114 places := 1
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115 if n < 0 {
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116 places++
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117 n = -n
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118 }
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119 for value := 10; n >= value; value *= 10 {
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120 places++
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121 }
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122 return places
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123 }
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124
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125 // Download is GML implementaion of the Downloader.
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126 func (gmd GMLDownloader) Download(user, password string, handler func(string, io.Reader) error) error {
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127
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128 if len(gmd) == 0 {
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129 return nil
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130 }
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131
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132 tmpDir := config.TmpDir()
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133 dlDir, err := os.MkdirTemp(tmpDir, "wfs-downloads")
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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 defer os.RemoveAll(dlDir)
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138 digits := places(len(gmd))
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139
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140 var files []string
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141
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142 for i, url := range gmd {
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143 fname := filepath.Join(dlDir, fmt.Sprintf("%0*d.gml", digits, i))
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144 if err := downloadURL(user, password, url, func(_ string, r io.Reader) error {
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145 f, err := os.Create(fname)
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146 if err != nil {
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147 return err
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148 }
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149 if _, err = io.Copy(f, r); err != nil {
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150 f.Close()
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151 return err
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152 }
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153 return f.Close()
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154 }); err != nil {
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155 return err
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156 }
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157 files = append(files, fname)
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158 }
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159
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160 out := filepath.Join(dlDir, "out.geojson")
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161
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162 cmd := exec.Command("ogr2ogr", append([]string{"-f", "GeoJSON", out}, files...)...)
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163
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164 msg, err := cmd.CombinedOutput()
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165 if err != nil {
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166 return fmt.Errorf("ogr2ogr failed: %s", msg)
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167 }
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168
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169 in, err := os.Open(out)
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170 if err != nil {
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171 return err
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172 }
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173 defer in.Close()
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174
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175 return handler(gmd[0], bufio.NewReader(in))
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49ce3c11ca72 WFS downloads: Started with GML based downloads based on installation of ogr2ogr.
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parents:
diff changeset
176 }