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annotate pkg/wfs/download.go @ 2620:a8ebc785823d

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WFS download: Removed waiting for configuration in feature download. It slipped in when added WFS error handling.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 13 Mar 2019 15:20:19 +0100
parents 8a6ed058af22
children 02505fcff63c
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.Reader.
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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 wfs
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15
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16 import (
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17 "bufio"
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18 "bytes"
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19 "encoding/xml"
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20 "errors"
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21 "fmt"
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22 "io"
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23 "log"
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24 "net/http"
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25 "net/url"
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26 "strconv"
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27 "strings"
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28
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29 "golang.org/x/net/html/charset"
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30 )
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31
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32 var (
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33 // ErrNoSuchFeatureType is returned when a feature is not supported.
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34 ErrNoSuchFeatureType = errors.New("No such feature type")
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35 // ErrGetFeatureNotSupported is returned when GetFeature is not supported.
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36 ErrGetFeatureNotSupported = errors.New("GetFeature not supported")
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37 // ErrMethodGetNotSupported is returned when the GET is not supported.
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38 ErrMethodGetNotSupported = errors.New("GET not supported")
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39 // ErrNoNumberMatchedFound is returned if feature count cannot be extracted.
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40 ErrNoNumberMatchedFound = errors.New("No numberMatched attribute found")
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41 // ErrOutputFormatNotSupported is returned if a output format is
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42 // not supported.
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43 ErrOutputFormatNotSupported = errors.New("Output format not supported")
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44 )
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45
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46 // GetCapabilities downloads a capabilities document for a given URL.
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47 func GetCapabilities(capURL string) (*Capabilities, error) {
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48
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49 base, err := url.Parse(capURL)
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50 if err != nil {
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51 return nil, err
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52 }
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53 v := url.Values{}
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54 v.Set("SERVICE", "WFS")
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55 v.Set("REQUEST", "GetCapabilities")
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56 v.Set("ACCEPTVERSIONS", "2.0.0,1.1.0,1.0.0")
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57 base.RawQuery = v.Encode()
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58
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59 baseURL := base.String()
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60 resp, err := http.Get(baseURL)
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61 if err != nil {
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62 return nil, err
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63 }
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64 defer resp.Body.Close()
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65 caps, err := ParseCapabilities(bufio.NewReader(resp.Body))
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66 if err == nil {
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67 caps.BaseURL = baseURL
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68 }
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69 return caps, err
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70 }
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71
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72 func numberFeaturesGET(u *url.URL, featureType, version string) (int, error) {
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73
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74 v := url.Values{}
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75 v.Set("SERVICE", "WFS")
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76 v.Set("REQUEST", "GetFeature")
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77 v.Set("resultType", "hits")
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78 v.Set("VERSION", version)
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79 v.Set("TYPENAMES", featureType)
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80
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81 q := *u
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82 q.RawQuery = v.Encode()
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83
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84 resp, err := http.Get(q.String())
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85 if err != nil {
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86 return 0, err
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87 }
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88 defer resp.Body.Close()
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89 dec := xml.NewDecoder(resp.Body)
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90 dec.CharsetReader = charset.NewReaderLabel
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91
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92 var result struct {
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93 NumberMatched *int `xml:"numberMatched,attr"`
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94 }
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95
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96 if err := dec.Decode(&result); err != nil {
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97 return 0, err
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98 }
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99
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100 if result.NumberMatched == nil {
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101 return 0, ErrNoNumberMatchedFound
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102 }
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103
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104 return *result.NumberMatched, nil
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105 }
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106
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107 // GetFeaturesGET constructs a list of URLs to get features
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108 // for a given feature type from a WFS servers.
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109 func GetFeaturesGET(
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110 caps *Capabilities,
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111 featureTypeName,
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112 outputFormat string,
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113 sortBy string,
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diff changeset
114 ) ([]string, error) {
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115
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116 feature := caps.FindFeatureType(featureTypeName)
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117 if feature == nil {
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118 return nil, ErrNoSuchFeatureType
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119 }
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120 op := caps.FindOperation("GetFeature")
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121 if op == nil {
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122 return nil, ErrGetFeatureNotSupported
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123 }
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124
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diff changeset
125 if op.DCP.HTTP.Get == nil {
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126 return nil, ErrMethodGetNotSupported
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127 }
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128
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129 getRaw := op.DCP.HTTP.Get.HRef
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130 getU, err := url.Parse(getRaw)
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131 if err != nil {
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132 return nil, err
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133 }
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134 // The URL could be relative so resolve against Capabilities URL.
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135 if !getU.IsAbs() {
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136 base, err := url.Parse(caps.BaseURL)
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137 if err != nil {
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138 return nil, err
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139 }
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140 getU = getU.ResolveReference(base)
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141 }
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142
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diff changeset
143 if !op.SupportsOutputFormat(outputFormat) {
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144 return nil, ErrOutputFormatNotSupported
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145 }
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146
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diff changeset
147 wfsVersion := caps.HighestWFSVersion(WFS200)
1608
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148
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diff changeset
149 featuresPerPage, supportsPaging := op.FeaturesPerPage()
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150
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151 var numFeatures int
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152
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diff changeset
153 if supportsPaging {
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diff changeset
154 log.Printf("info: Paging supported with %d feature per page.\n",
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155 featuresPerPage)
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156
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diff changeset
157 if !op.SupportsHits() {
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158 supportsPaging = false
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diff changeset
159 } else {
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diff changeset
160 numFeatures, err = numberFeaturesGET(getU, featureTypeName, wfsVersion)
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diff changeset
161 if err != nil {
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diff changeset
162 log.Printf("error: %v\n", err)
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163 supportsPaging = false
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parents:
diff changeset
164 } else {
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diff changeset
165 log.Printf("info: Number of features: %d\n", numFeatures)
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166 }
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167 }
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168 }
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169
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diff changeset
170 var downloadURLs []string
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171 wfs2 := !versionIsLess(wfsVersion, WFS200)
1614
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172
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173 addNS := func(v url.Values) {
efc409e330a6 WFS downloader: Propagate namespaces of feature type into GetFeature request.
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174 if len(feature.Namespaces) == 0 {
efc409e330a6 WFS downloader: Propagate namespaces of feature type into GetFeature request.
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175 return
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176 }
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177 // Only use first namespace
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178 ns := feature.Namespaces[0]
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179 if wfs2 {
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180 v.Set("NAMESPACES", fmt.Sprintf("(%s,%s)", ns.Space, ns.Local))
efc409e330a6 WFS downloader: Propagate namespaces of feature type into GetFeature request.
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181 } else {
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diff changeset
182 v.Set("NAMESPACE", fmt.Sprintf("(%s:%s)", ns.Space, ns.Local))
efc409e330a6 WFS downloader: Propagate namespaces of feature type into GetFeature request.
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183 }
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diff changeset
184 }
1608
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185
1616
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diff changeset
186 addOutputFormat := func(v url.Values) {
f59550310143 WFS downloader: Support different feature output formats.
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diff changeset
187 if outputFormat != "" {
f59550310143 WFS downloader: Support different feature output formats.
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188 v.Set("outputFormat", outputFormat)
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189 }
f59550310143 WFS downloader: Support different feature output formats.
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diff changeset
190 }
f59550310143 WFS downloader: Support different feature output formats.
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diff changeset
191
1619
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diff changeset
192 addSortBy := func(v url.Values) {
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diff changeset
193 if sortBy != "" {
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diff changeset
194 v.Set("sortBy", sortBy)
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diff changeset
195 }
3093bab05c81 WFS downloader: Dump features to stdout for testing purposes.
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diff changeset
196 }
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diff changeset
197
1608
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diff changeset
198 if supportsPaging {
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parents:
diff changeset
199 pagedURL := func(ofs, count int) string {
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parents:
diff changeset
200 v := url.Values{}
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parents:
diff changeset
201 v.Set("SERVICE", "WFS")
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parents:
diff changeset
202 v.Set("REQUEST", "GetFeature")
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diff changeset
203 v.Set("VERSION", wfsVersion)
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parents:
diff changeset
204 v.Set("startIndex", strconv.Itoa(ofs))
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parents:
diff changeset
205 if wfs2 {
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parents:
diff changeset
206 v.Set("count", strconv.Itoa(count))
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parents:
diff changeset
207 } else {
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diff changeset
208 v.Set("maxFeatures", strconv.Itoa(count))
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
209 }
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parents:
diff changeset
210 v.Set("TYPENAMES", featureTypeName)
1614
efc409e330a6 WFS downloader: Propagate namespaces of feature type into GetFeature request.
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diff changeset
211 addNS(v)
1616
f59550310143 WFS downloader: Support different feature output formats.
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diff changeset
212 addOutputFormat(v)
1619
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diff changeset
213 addSortBy(v)
1608
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
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parents:
diff changeset
214 q := *getU
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parents:
diff changeset
215 q.RawQuery = v.Encode()
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
216 return q.String()
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parents:
diff changeset
217 }
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218 if numFeatures <= featuresPerPage {
2096
8b7dee291488 WFS downloader: Harmonized logging.
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parents: 1935
diff changeset
219 log.Println("info: All features can be fetched in one page.")
1608
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
220 downloadURLs = []string{pagedURL(0, numFeatures)}
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221 } else {
2096
8b7dee291488 WFS downloader: Harmonized logging.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1935
diff changeset
222 log.Println("info: Features need to be downloaded in pages.")
1608
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223 for pos := 0; pos < numFeatures; {
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 var count int
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 if rest := numFeatures - pos; rest >= numFeatures {
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
226 count = numFeatures
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
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parents:
diff changeset
227 } else {
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
228 count = rest
427f9010b4a9 WFS download: Started with GET downloader (paged and unpaged).
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
229 }
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230 downloadURLs = append(downloadURLs, pagedURL(pos, count))
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231 pos += count
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232 }
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233 }
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234 } else { // No paging support.
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235 v := url.Values{}
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236 v.Set("SERVICE", "WFS")
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237 v.Set("REQUEST", "GetFeature")
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238 v.Set("VERSION", wfsVersion)
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239 v.Set("TYPENAMES", featureTypeName)
1614
efc409e330a6 WFS downloader: Propagate namespaces of feature type into GetFeature request.
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diff changeset
240 addNS(v)
1616
f59550310143 WFS downloader: Support different feature output formats.
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diff changeset
241 addOutputFormat(v)
1619
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242 addSortBy(v)
1608
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243 q := *getU
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244 q.RawQuery = v.Encode()
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245 downloadURLs = []string{q.String()}
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246 }
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247
1619
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248 return downloadURLs, nil
1608
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249 }
1624
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250
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251 func downloadURL(url string, handler func(string, io.Reader) error) error {
1624
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252 resp, err := http.Get(url)
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253 if err != nil {
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254 return err
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255 }
1626
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diff changeset
256 if resp.StatusCode < 200 || resp.StatusCode > 299 {
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257 return fmt.Errorf("Invalid HTTP status code: %d (%s)",
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258 resp.StatusCode, resp.Status)
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diff changeset
259 }
1624
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260 defer resp.Body.Close()
2110
fc4ebe7eaeff WFS downloader: Don't use temp files. TODO: Use a streaming scanner for the detection of the exception documents.
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261
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262 var already bytes.Buffer
2109
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263
2110
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diff changeset
264 // Prevent the XML reader from consuming everything.
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265 limit := io.LimitReader(resp.Body, 16*1024)
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266 in := io.TeeReader(limit, &already)
2109
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267
2110
fc4ebe7eaeff WFS downloader: Don't use temp files. TODO: Use a streaming scanner for the detection of the exception documents.
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268 if err := scanExceptionReport(in); err != nil {
2109
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269 return err
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270 }
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271
2110
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272 multi := io.MultiReader(bytes.NewReader(already.Bytes()), resp.Body)
fc4ebe7eaeff WFS downloader: Don't use temp files. TODO: Use a streaming scanner for the detection of the exception documents.
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273 return handler(url, multi)
2109
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274 }
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275
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276 type ExceptionReport struct {
2118
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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277 Code string
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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278 Text string
2109
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279 }
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diff changeset
280
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281 func (er *ExceptionReport) Error() string {
86c88fc0ff5e WFS downloader: Parse for exception reports when calling GetFeature. Not very efficient (uses temp files).
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282 return fmt.Sprintf(
86c88fc0ff5e WFS downloader: Parse for exception reports when calling GetFeature. Not very efficient (uses temp files).
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283 "WFS GetFeature error: ExceptionCode: '%s' / ExceptionText: %s",
2118
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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284 er.Code, er.Text)
2109
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285 }
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diff changeset
286
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diff changeset
287 func scanExceptionReport(r io.Reader) *ExceptionReport {
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288
2118
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289 const ows = "http://www.opengis.net/ows/1.1"
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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290
2109
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diff changeset
291 decoder := xml.NewDecoder(r)
86c88fc0ff5e WFS downloader: Parse for exception reports when calling GetFeature. Not very efficient (uses temp files).
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diff changeset
292 decoder.CharsetReader = charset.NewReaderLabel
86c88fc0ff5e WFS downloader: Parse for exception reports when calling GetFeature. Not very efficient (uses temp files).
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diff changeset
293
2118
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
294 var (
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
295 isError bool
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
296 code string
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
297 depth int
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
298 text strings.Builder
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
299 )
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
300
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
301 type tokenFunc func(xml.Token) tokenFunc
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
302
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
303 var exceptionReportFn, exceptionFn, exceptionTextFn, collectTextFn tokenFunc
2109
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diff changeset
304
2118
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diff changeset
305 exceptionReportFn = func(t xml.Token) tokenFunc {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
306 e, ok := t.(xml.StartElement)
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
307 if !ok {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
308 return exceptionReportFn
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
309 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
310 if e.Name.Local != "ExceptionReport" && e.Name.Space != ows {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
311 return nil
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
312 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
313 isError = true
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
314 return exceptionFn
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
315 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
316
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
317 exceptionFn = func(t xml.Token) tokenFunc {
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diff changeset
318 e, ok := t.(xml.StartElement)
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diff changeset
319 if !ok {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
320 return exceptionFn
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
321 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
322 if e.Name.Local == "Exception" && e.Name.Space == ows {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
323 for i := range e.Attr {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
324 at := &e.Attr[i]
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diff changeset
325 if at.Name.Local == "code" || at.Name.Local == "exceptionCode" {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
326 code = at.Value
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
327 break
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
328 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
329 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
330 return exceptionTextFn
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
331 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
332 return exceptionFn
2109
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diff changeset
333 }
86c88fc0ff5e WFS downloader: Parse for exception reports when calling GetFeature. Not very efficient (uses temp files).
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diff changeset
334
2118
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diff changeset
335 exceptionTextFn = func(t xml.Token) tokenFunc {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
336 e, ok := t.(xml.StartElement)
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
337 if ok && e.Name.Local == "ExceptionText" && e.Name.Space == ows {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
338 return collectTextFn
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
339 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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diff changeset
340 return exceptionTextFn
2109
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diff changeset
341 }
86c88fc0ff5e WFS downloader: Parse for exception reports when calling GetFeature. Not very efficient (uses temp files).
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diff changeset
342
2118
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diff changeset
343 collectTextFn = func(t xml.Token) tokenFunc {
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344 switch e := t.(type) {
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parents: 2110
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345 case xml.StartElement:
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parents: 2110
diff changeset
346 depth++
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parents: 2110
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347 case xml.CharData:
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348 if depth == 0 {
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parents: 2110
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349 text.Write(e)
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parents: 2110
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350 }
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parents: 2110
diff changeset
351 case xml.EndElement:
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parents: 2110
diff changeset
352 if depth == 0 {
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parents: 2110
diff changeset
353 return nil
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parents: 2110
diff changeset
354 }
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parents: 2110
diff changeset
355 depth--
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parents: 2110
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356 }
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parents: 2110
diff changeset
357 return collectTextFn
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parents: 2110
diff changeset
358 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
359
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
360 tokens:
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
361 for fn := exceptionReportFn; fn != nil; {
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parents: 2110
diff changeset
362 tok, err := decoder.Token()
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
363 switch {
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parents: 2110
diff changeset
364 case tok == nil && err == io.EOF:
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
365 break tokens
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parents: 2110
diff changeset
366 case err != nil:
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parents: 2110
diff changeset
367 return nil
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
368 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
369 fn = fn(tok)
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parents: 2110
diff changeset
370 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
371
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
372 if isError {
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
373 return &ExceptionReport{
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
374 Code: code,
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parents: 2110
diff changeset
375 Text: text.String(),
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parents: 2110
diff changeset
376 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
377 }
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2110
diff changeset
378
8a6ed058af22 WFS downloader: Use a custom XML streaming parser to detect error reports.
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parents: 2110
diff changeset
379 return nil
1624
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1619
diff changeset
380 }
943823d03d50 WFS downloader: Started with mapping return features to Go structs.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1619
diff changeset
381
1689
6caf5cd6249e WFS: Made golint happy.
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parents: 1626
diff changeset
382 // DownloadURLs does the actual GetFeature requests downloads
6caf5cd6249e WFS: Made golint happy.
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parents: 1626
diff changeset
383 // and hands the resulting io.Readers over to the given handler.
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2b72f5e005aa WFS imports: Write get GetFeature URLs into import log.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2096
diff changeset
384 func DownloadURLs(urls []string, handler func(string, io.Reader) error) error {
1624
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parents: 1619
diff changeset
385 for _, url := range urls {
943823d03d50 WFS downloader: Started with mapping return features to Go structs.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1619
diff changeset
386 if err := downloadURL(url, handler); err != nil {
1935
73f9e15d0384 WFS downloader: die correctly if an error was detected when downloading features.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1689
diff changeset
387 return err
1624
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1619
diff changeset
388 }
943823d03d50 WFS downloader: Started with mapping return features to Go structs.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1619
diff changeset
389 }
943823d03d50 WFS downloader: Started with mapping return features to Go structs.
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parents: 1619
diff changeset
390 return nil
943823d03d50 WFS downloader: Started with mapping return features to Go structs.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1619
diff changeset
391 }