Mercurial > gemma
annotate pkg/wfs/download.go @ 1791:0f98ef2531a5
importschedule: frontend for waterway gauges etd
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Mon, 14 Jan 2019 12:09:34 +0100 |
parents | 6caf5cd6249e |
children | 73f9e15d0384 |
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 "encoding/xml" |
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19 "errors" |
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20 "fmt" |
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21 "io" |
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22 "log" |
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23 "net/http" |
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24 "net/url" |
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25 "strconv" |
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26 |
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27 "golang.org/x/net/html/charset" |
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28 ) |
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29 |
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30 var ( |
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31 // ErrNoSuchFeatureType is returned when a feature is not supported. |
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32 ErrNoSuchFeatureType = errors.New("No such feature type") |
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33 // ErrGetFeatureNotSupported is returned when GetFeature is not supported. |
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34 ErrGetFeatureNotSupported = errors.New("GetFeature not supported") |
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35 // ErrMethodGetNotSupported is returned when the GET is not supported. |
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36 ErrMethodGetNotSupported = errors.New("GET not supported") |
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37 // ErrNoNumberMatchedFound is returned if feature count cannot be extracted. |
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38 ErrNoNumberMatchedFound = errors.New("No numberMatched attribute found") |
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39 // ErrOutputFormatNotSupported is returned if a output format is |
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40 // not supported. |
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41 ErrOutputFormatNotSupported = errors.New("Output format not supported") |
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42 ) |
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43 |
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44 // GetCapabilities downloads a capabilities document for a given URL. |
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45 func GetCapabilities(capURL string) (*Capabilities, error) { |
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46 |
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47 base, err := url.Parse(capURL) |
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48 if err != nil { |
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49 return nil, err |
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50 } |
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51 v := url.Values{} |
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52 v.Set("SERVICE", "WFS") |
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53 v.Set("REQUEST", "GetCapabilities") |
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54 v.Set("ACCEPTVERSIONS", "2.0.0,1.1.0,1.0.0") |
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55 base.RawQuery = v.Encode() |
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56 |
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57 baseURL := base.String() |
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58 resp, err := http.Get(baseURL) |
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59 if err != nil { |
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60 return nil, err |
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61 } |
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62 defer resp.Body.Close() |
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63 caps, err := ParseCapabilities(bufio.NewReader(resp.Body)) |
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64 if err == nil { |
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65 caps.BaseURL = baseURL |
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66 } |
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67 return caps, err |
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68 } |
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69 |
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70 func numberFeaturesGET(u *url.URL, featureType, version string) (int, error) { |
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71 |
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72 v := url.Values{} |
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73 v.Set("SERVICE", "WFS") |
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74 v.Set("REQUEST", "GetFeature") |
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75 v.Set("resultType", "hits") |
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76 v.Set("VERSION", version) |
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77 v.Set("TYPENAMES", featureType) |
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78 |
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79 q := *u |
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80 q.RawQuery = v.Encode() |
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81 |
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82 resp, err := http.Get(q.String()) |
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83 if err != nil { |
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84 return 0, err |
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85 } |
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86 defer resp.Body.Close() |
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87 dec := xml.NewDecoder(resp.Body) |
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88 dec.CharsetReader = charset.NewReaderLabel |
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89 |
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90 var result struct { |
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91 NumberMatched *int `xml:"numberMatched,attr"` |
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92 } |
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93 |
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94 if err := dec.Decode(&result); err != nil { |
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95 return 0, err |
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96 } |
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97 |
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98 if result.NumberMatched == nil { |
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99 return 0, ErrNoNumberMatchedFound |
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100 } |
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101 |
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102 return *result.NumberMatched, nil |
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103 } |
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104 |
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105 // GetFeaturesGET constructs a list of URLs to get features |
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106 // for a given feature type from a WFS servers. |
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107 func GetFeaturesGET( |
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108 caps *Capabilities, |
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109 featureTypeName, |
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110 outputFormat string, |
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111 sortBy string, |
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112 ) ([]string, error) { |
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113 |
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114 feature := caps.FindFeatureType(featureTypeName) |
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115 if feature == nil { |
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116 return nil, ErrNoSuchFeatureType |
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117 } |
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118 op := caps.FindOperation("GetFeature") |
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119 if op == nil { |
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120 return nil, ErrGetFeatureNotSupported |
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121 } |
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122 |
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123 if op.DCP.HTTP.Get == nil { |
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124 return nil, ErrMethodGetNotSupported |
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125 } |
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126 |
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127 getRaw := op.DCP.HTTP.Get.HRef |
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128 getU, err := url.Parse(getRaw) |
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129 if err != nil { |
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130 return nil, err |
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131 } |
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132 // The URL could be relative so resolve against Capabilities URL. |
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133 if !getU.IsAbs() { |
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134 base, err := url.Parse(caps.BaseURL) |
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135 if err != nil { |
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136 return nil, err |
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137 } |
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138 getU = getU.ResolveReference(base) |
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139 } |
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140 |
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141 if !op.SupportsOutputFormat(outputFormat) { |
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142 return nil, ErrOutputFormatNotSupported |
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143 } |
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144 |
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145 wfsVersion := caps.HighestWFSVersion(WFS200) |
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146 |
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147 featuresPerPage, supportsPaging := op.FeaturesPerPage() |
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148 |
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149 var numFeatures int |
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150 |
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151 if supportsPaging { |
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152 log.Printf("Paging supported with %d feature per page.\n", |
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153 featuresPerPage) |
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154 |
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155 if !op.SupportsHits() { |
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156 supportsPaging = false |
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157 } else { |
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158 numFeatures, err = numberFeaturesGET(getU, featureTypeName, wfsVersion) |
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159 if err != nil { |
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160 log.Printf("error: %v\n", err) |
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161 supportsPaging = false |
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162 } else { |
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163 log.Printf("Number of features: %d\n", numFeatures) |
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164 } |
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165 } |
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166 } |
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167 |
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168 var downloadURLs []string |
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169 wfs2 := !versionIsLess(wfsVersion, WFS200) |
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170 |
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171 addNS := func(v url.Values) { |
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172 if len(feature.Namespaces) == 0 { |
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173 return |
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174 } |
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175 // Only use first namespace |
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176 ns := feature.Namespaces[0] |
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177 if wfs2 { |
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178 v.Set("NAMESPACES", fmt.Sprintf("(%s,%s)", ns.Space, ns.Local)) |
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179 } else { |
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180 v.Set("NAMESPACE", fmt.Sprintf("(%s:%s)", ns.Space, ns.Local)) |
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181 } |
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182 } |
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183 |
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184 addOutputFormat := func(v url.Values) { |
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185 if outputFormat != "" { |
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186 v.Set("outputFormat", outputFormat) |
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187 } |
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188 } |
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189 |
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190 addSortBy := func(v url.Values) { |
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191 if sortBy != "" { |
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192 v.Set("sortBy", sortBy) |
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193 } |
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194 } |
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195 |
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196 if supportsPaging { |
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197 pagedURL := func(ofs, count int) string { |
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198 v := url.Values{} |
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199 v.Set("SERVICE", "WFS") |
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200 v.Set("REQUEST", "GetFeature") |
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201 v.Set("VERSION", wfsVersion) |
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202 v.Set("startIndex", strconv.Itoa(ofs)) |
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203 if wfs2 { |
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204 v.Set("count", strconv.Itoa(count)) |
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205 } else { |
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206 v.Set("maxFeatures", strconv.Itoa(count)) |
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207 } |
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208 v.Set("TYPENAMES", featureTypeName) |
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209 addNS(v) |
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210 addOutputFormat(v) |
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211 addSortBy(v) |
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212 q := *getU |
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213 q.RawQuery = v.Encode() |
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214 return q.String() |
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215 } |
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216 if numFeatures <= featuresPerPage { |
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217 log.Println("All features can be fetched in one page") |
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218 downloadURLs = []string{pagedURL(0, numFeatures)} |
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219 } else { |
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220 log.Println("Features need to be downloaded in pages.") |
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221 for pos := 0; pos < numFeatures; { |
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222 var count int |
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223 if rest := numFeatures - pos; rest >= numFeatures { |
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224 count = numFeatures |
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225 } else { |
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226 count = rest |
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227 } |
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228 downloadURLs = append(downloadURLs, pagedURL(pos, count)) |
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229 pos += count |
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230 } |
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231 } |
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232 } else { // No paging support. |
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233 v := url.Values{} |
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234 v.Set("SERVICE", "WFS") |
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235 v.Set("REQUEST", "GetFeature") |
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236 v.Set("VERSION", wfsVersion) |
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237 v.Set("TYPENAMES", featureTypeName) |
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238 addNS(v) |
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239 addOutputFormat(v) |
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240 addSortBy(v) |
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241 q := *getU |
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242 q.RawQuery = v.Encode() |
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243 downloadURLs = []string{q.String()} |
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244 } |
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245 |
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246 return downloadURLs, nil |
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247 } |
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248 |
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249 func downloadURL(url string, handler func(io.Reader) error) error { |
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250 resp, err := http.Get(url) |
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251 if err != nil { |
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252 return err |
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253 } |
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254 if resp.StatusCode < 200 || resp.StatusCode > 299 { |
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255 return fmt.Errorf("Invalid HTTP status code: %d (%s)", |
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256 resp.StatusCode, resp.Status) |
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257 } |
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258 defer resp.Body.Close() |
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259 return handler(resp.Body) |
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260 } |
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261 |
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262 // DownloadURLs does the actual GetFeature requests downloads |
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263 // and hands the resulting io.Readers over to the given handler. |
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264 func DownloadURLs(urls []string, handler func(io.Reader) error) error { |
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265 for _, url := range urls { |
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266 if err := downloadURL(url, handler); err != nil { |
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267 return nil |
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268 } |
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269 } |
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270 return nil |
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271 } |