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annotate pkg/wfs/global.go @ 5593:88a41fc07c97

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Merged surveysperbottleneckid
author Sascha Wilde <wilde@sha-bang.de>
date Tue, 19 Apr 2022 13:02:45 +0200
parents 09346efa7f69
children 31973f6f5cca
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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 "io/ioutil"
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21 "os"
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22 "os/exec"
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23 "path/filepath"
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24 "sync"
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25
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26 "gemma.intevation.de/gemma/pkg/config"
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27 "gemma.intevation.de/gemma/pkg/log"
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28 )
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29
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30 var (
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31 // FormatGeoJSON is a list of MIME types of
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32 // GeoJSON documents.
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33 FormatGeoJSON = []string{"geojson", "application/json"}
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34 // FormatGML is a list of MIME types
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35 // GML documents.
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36 FormatGML = []string{
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37 "application/gml+xml; version=3.2",
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38 "gml2", "gml3", "gml32",
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39 "text/xml; subtype=gml/2.1.2",
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40 "text/xml; subtype=gml/3.1.1",
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41 "text/xml; subtype=gml/3.2",
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42 }
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43 )
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44
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45 type (
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46 // Downloader abstracts the idea of a download function for WFS.
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47 Downloader interface {
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48 Download(user, password string, handler func(string, io.Reader) error) error
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49 }
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50
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51 // GeoJSONDownloader is a Downloader for GeoJSON.
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52 GeoJSONDownloader []string
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53 // GMLDownloader is a Downloader for GML.
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54 GMLDownloader []string
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55 )
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56
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57 var (
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58 getFeaturesOnce sync.Once
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59 getFeatures func(*Capabilities, string, string) (Downloader, error)
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60 )
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61
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62 func getFeaturesOnceFunc() {
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63 path, err := exec.LookPath("ogr2ogr")
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64 if err != nil {
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65 log.Infoln("ogr2ogr not installed. Using direct GeoJSON WFS download.")
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66 getFeatures = getFeaturesGeoJSON
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67 } else {
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68 log.Infof("ogr2ogr found at %s. Using GML WFS download.\n", path)
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69 getFeatures = getFeaturesGML
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70 }
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71 }
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72
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73 // GetFeatures is the default Downloader in this Gemma server.
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74 func GetFeatures(
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75 caps *Capabilities,
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76 featureTypeName string,
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77 sortBy string,
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78 ) (Downloader, error) {
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79 getFeaturesOnce.Do(getFeaturesOnceFunc)
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80 return getFeatures(caps, featureTypeName, sortBy)
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81 }
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82
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83 func getFeaturesGeoJSON(
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84 caps *Capabilities,
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85 featureTypeName string,
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86 sortBy string,
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87 ) (Downloader, error) {
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88 urls, err := GetFeaturesGET(
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89 caps,
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90 featureTypeName,
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91 FormatGeoJSON,
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92 sortBy)
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93 return GeoJSONDownloader(urls), err
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94 }
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95
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96 func getFeaturesGML(
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97 caps *Capabilities,
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98 featureTypeName string,
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99 sortBy string,
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100 ) (Downloader, error) {
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101 urls, err := GetFeaturesGET(
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102 caps,
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103 featureTypeName,
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104 FormatGML,
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105 sortBy)
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106 return GMLDownloader(urls), err
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107 }
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108
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109 // Download is the GeoJSON implementation of the Downloader.
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110 func (gjd GeoJSONDownloader) Download(user, password string, handler func(string, io.Reader) error) error {
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111 return DownloadURLs(user, password, []string(gjd), handler)
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112 }
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113
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114 func places(n int) int {
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115 places := 1
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116 if n < 0 {
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117 places++
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118 n = -n
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119 }
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120 for value := 10; n >= value; value *= 10 {
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121 places++
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122 }
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123 return places
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124 }
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125
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126 // Download is GML implementaion of the Downloader.
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127 func (gmd GMLDownloader) Download(user, password string, handler func(string, io.Reader) error) error {
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128
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129 if len(gmd) == 0 {
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130 return nil
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131 }
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132
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133 tmpDir := config.TmpDir()
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134 dlDir, err := ioutil.TempDir(tmpDir, "wfs-downloads")
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135 if err != nil {
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136 return err
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137 }
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138 defer os.RemoveAll(dlDir)
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139 digits := places(len(gmd))
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140
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141 var files []string
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142
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143 for i, url := range gmd {
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144 fname := filepath.Join(dlDir, fmt.Sprintf("%0*d.gml", digits, i))
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145 if err := downloadURL(user, password, url, func(_ string, r io.Reader) error {
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146 f, err := os.Create(fname)
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147 if err != nil {
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148 return err
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149 }
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150 if _, err = io.Copy(f, r); err != nil {
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151 f.Close()
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152 return err
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153 }
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154 return f.Close()
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155 }); err != nil {
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156 return err
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157 }
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158 files = append(files, fname)
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159 }
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160
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161 out := filepath.Join(dlDir, "out.geojson")
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162
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163 cmd := exec.Command("ogr2ogr", append([]string{"-f", "GeoJSON", out}, files...)...)
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164
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165 msg, err := cmd.CombinedOutput()
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166 if err != nil {
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167 return fmt.Errorf("ogr2ogr failed: %s", msg)
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168 }
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169
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170 in, err := os.Open(out)
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171 if err != nil {
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172 return err
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173 }
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174 defer in.Close()
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175
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176 return handler(gmd[0], bufio.NewReader(in))
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parents:
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177 }