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annotate pkg/wfs/global.go @ 2711:3956de9b6b32

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WFS downloader: Implemented GML download to file, ogr2ogr to GeoJSON.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 18 Mar 2019 17:20:02 +0100
parents d7ef169fd0d3
children 2b6f73c30016
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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 "errors"
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19 "fmt"
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20 "io"
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21 "io/ioutil"
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22 "log"
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23 "os"
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24 "os/exec"
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25 "path/filepath"
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27 "gemma.intevation.de/gemma/pkg/config"
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28 )
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29
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30 var (
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31 FormatGeoJSON = []string{"geojson", "application/json"}
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32 FormatGML = []string{
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33 "application/gml+xml; version=3.2",
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34 "gml2", "gml3", "gml32",
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35 "text/xml; subtype=gml/2.1.2",
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36 "text/xml; subtype=gml/3.1.1",
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37 "text/xml; subtype=gml/3.2",
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38 }
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39 )
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40
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41 type (
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42 Downloader interface {
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43 Download(handler func(string, io.Reader) error) error
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44 }
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46 GeoJSONDownloader []string
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47 GMLDownloader []string
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48 )
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49
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50 var GetFeatures = setup()
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51
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52 func setup() func(*Capabilities, string, string) (Downloader, error) {
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53 path, err := exec.LookPath("ogr2ogr")
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54 if err != nil {
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55 log.Println("info: ogr2ogr not installed. Using direct GeoJSON WFS download.")
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56 return GetFeaturesGeoJSON
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57 }
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58 log.Printf("info: ogr2ogr found at %s. Using GML WFS download.\n", path)
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59 return GetFeaturesGML
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60 }
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61
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62 func GetFeaturesGeoJSON(
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63 caps *Capabilities,
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64 featureTypeName string,
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65 sortBy string,
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66 ) (Downloader, error) {
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67 urls, err := GetFeaturesGET(
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68 caps,
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69 featureTypeName,
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70 FormatGeoJSON,
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71 sortBy)
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72 return GeoJSONDownloader(urls), err
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73 }
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75 func GetFeaturesGML(
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76 caps *Capabilities,
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77 featureTypeName string,
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78 sortBy string,
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79 ) (Downloader, error) {
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80 urls, err := GetFeaturesGET(
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81 caps,
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82 featureTypeName,
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83 FormatGML,
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84 sortBy)
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85 return GMLDownloader(urls), err
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86 }
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87
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88 func (gjd GeoJSONDownloader) Download(handler func(string, io.Reader) error) error {
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89 return DownloadURLs([]string(gjd), handler)
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90 }
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91
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92 func places(n int) int {
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93 places := 1
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94 if n < 0 {
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95 places++
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96 n = -n
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97 }
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98 for value := 10; n >= value; value *= 10 {
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99 places++
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100 }
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101 return places
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102 }
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104 func (gmd GMLDownloader) Download(handler func(string, io.Reader) error) error {
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106 if len(gmd) == 0 {
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107 return errors.New("Nothing to download")
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108 }
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110 tmpDir := config.TmpDir()
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111 dlDir, err := ioutil.TempDir(tmpDir, "wfs-downloads")
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112 if err != nil {
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113 return err
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114 }
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115 defer os.RemoveAll(dlDir)
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116 digits := places(len(gmd))
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117
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118 var files []string
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119
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120 for i, url := range gmd {
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121 fname := filepath.Join(dlDir, fmt.Sprintf("%0*d.gml", digits, i))
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122 if err := downloadURL(url, func(_ string, r io.Reader) error {
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123 f, err := os.Create(fname)
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124 if err != nil {
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125 return err
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126 }
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127 if _, err = io.Copy(f, r); err != nil {
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128 f.Close()
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129 return err
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130 }
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131 return f.Close()
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132 }); err != nil {
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133 return err
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134 }
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135 files = append(files, fname)
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136 }
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137
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138 out := filepath.Join(dlDir, "out.geojson")
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139
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140 cmd := exec.Command("ogr2ogr", append([]string{"-f", "GeoJSON", out}, files...)...)
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141
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142 msg, err := cmd.CombinedOutput()
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143 if err != nil {
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144 return fmt.Errorf("ogr2ogr failed: %s", msg)
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145 }
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146
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147 in, err := os.Open(out)
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148 if err != nil {
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149 return err
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150 }
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151 defer in.Close()
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152
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153 return handler(gmd[0], bufio.NewReader(in))
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parents:
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154 }