Mercurial > gemma
annotate pkg/imports/wx.go @ 2068:5a898da60b87
dma added
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Wed, 30 Jan 2019 15:43:08 +0100 |
parents | 1ecfcf46e4da |
children | 2b72f5e005aa |
rev | line source |
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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) 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 imports |
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15 |
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16 import ( |
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17 "context" |
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18 "database/sql" |
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19 "encoding/json" |
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20 "errors" |
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21 "fmt" |
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22 "io" |
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23 "time" |
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24 |
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25 "gemma.intevation.de/gemma/pkg/common" |
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26 "gemma.intevation.de/gemma/pkg/wfs" |
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27 ) |
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28 |
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29 // WaterwayAxis is an import job to import |
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30 // the waterway axes in form of line string geometries |
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31 // and attribute data from a WFS service. |
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32 type WaterwayAxis struct { |
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33 // URL the GetCapabilities URL of the WFS service. |
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34 URL string `json:"url"` |
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35 // FeatureType selects the feature type of the WFS service. |
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36 FeatureType string `json:"feature-type"` |
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37 // SortBy works around misconfigured services to |
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38 // establish a sort order to get the features. |
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39 SortBy string `json:"sort-by"` |
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40 } |
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41 |
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42 // WXJobKind is the import queue type identifier. |
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43 const WXJobKind JobKind = "wx" |
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44 |
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45 type wxJobCreator struct{} |
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46 |
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47 func init() { |
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48 RegisterJobCreator(WXJobKind, wxJobCreator{}) |
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49 } |
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50 |
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51 func (wxJobCreator) Description() string { return "waterway axis" } |
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52 |
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53 func (wxJobCreator) AutoAccept() bool { return true } |
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54 |
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55 func (wxJobCreator) Create(_ JobKind, data string) (Job, error) { |
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56 wx := new(WaterwayAxis) |
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57 if err := common.FromJSONString(data, wx); err != nil { |
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58 return nil, err |
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59 } |
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60 return wx, nil |
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61 } |
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62 |
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63 func (wxJobCreator) Depends() []string { |
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64 return []string{ |
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65 "waterway_axis", |
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66 } |
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67 } |
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68 |
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69 // StageDone is a NOP for waterway axis imports. |
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70 func (wxJobCreator) StageDone(context.Context, *sql.Tx, int64) error { |
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71 return nil |
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72 } |
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73 |
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74 // CleanUp for waterway axis imports is a NOP. |
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75 func (*WaterwayAxis) CleanUp() error { return nil } |
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76 |
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77 type waterwayAxisProperties struct { |
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78 ObjNam string `json:"hydro_objnam"` |
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79 NObjNnm *string `json:"hydro_nobjnm"` |
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80 } |
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81 |
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82 const ( |
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83 deleteWaterwayAxisSQL = ` |
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84 WITH resp AS ( |
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85 SELECT best_utm(area::geometry) AS t, |
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86 ST_Transform(area::geometry, best_utm(area::geometry)) AS a |
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87 FROM users.responsibility_areas |
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88 WHERE country = users.current_user_country() |
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89 ) |
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90 DELETE FROM waterway.waterway_axis |
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91 WHERE ST_Covers( |
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92 (SELECT a FROM resp), |
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93 ST_Transform(wtwaxs::geometry, (SELECT t FROM resp))) |
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94 ` |
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95 |
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96 insertWaterwayAxisSQL = ` |
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97 WITH resp AS ( |
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98 SELECT best_utm(area::geometry) AS t, |
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99 ST_Transform(area::geometry, best_utm(area::geometry)) AS a |
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100 FROM users.responsibility_areas |
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101 WHERE country = users.current_user_country() |
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102 ) |
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103 INSERT INTO waterway.waterway_axis (wtwaxs, objnam, nobjnam) |
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104 SELECT ST_Transform(clipped.geom, 4326)::geography, $3, $4 FROM ( |
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105 SELECT (ST_Dump( |
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106 ST_Intersection( |
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107 (SELECT a FROM resp), |
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108 ST_Transform( |
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109 ST_GeomFromWKB($1, $2::integer), |
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110 (SELECT t FROM resp) |
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111 ) |
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112 ) |
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113 )).geom AS geom |
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114 ) AS clipped |
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115 WHERE clipped.geom IS NOT NULL |
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116 ` |
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117 ) |
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118 |
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119 // Do executes the actual waterway axis import. |
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120 func (wx *WaterwayAxis) Do( |
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121 ctx context.Context, |
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122 importID int64, |
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123 conn *sql.Conn, |
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124 feedback Feedback, |
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125 ) (interface{}, error) { |
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126 |
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127 start := time.Now() |
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128 |
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129 feedback.Info("Import waterway axis") |
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130 |
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131 feedback.Info("Loading capabilities from %s", wx.URL) |
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132 caps, err := wfs.GetCapabilities(wx.URL) |
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133 if err != nil { |
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134 feedback.Error("Loading capabilities failed: %v", err) |
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135 return nil, err |
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136 } |
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137 |
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138 ft := caps.FindFeatureType(wx.FeatureType) |
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139 if ft == nil { |
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140 return nil, fmt.Errorf("Unknown feature type '%s'", wx.FeatureType) |
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141 } |
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142 |
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143 feedback.Info("Found feature type '%s", wx.FeatureType) |
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144 |
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145 epsg, err := wfs.CRSToEPSG(ft.DefaultCRS) |
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146 if err != nil { |
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147 feedback.Error("Unsupported CRS name '%s'", ft.DefaultCRS) |
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148 return nil, err |
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149 } |
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150 |
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151 if wx.SortBy != "" { |
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152 feedback.Info("Features will be sorted by '%s'", wx.SortBy) |
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153 } |
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154 |
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155 urls, err := wfs.GetFeaturesGET( |
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156 caps, wx.FeatureType, "application/json", wx.SortBy) |
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157 if err != nil { |
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158 feedback.Error("Cannot create GetFeature URLs. %v", err) |
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159 return nil, err |
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160 } |
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161 |
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162 tx, err := conn.BeginTx(ctx, nil) |
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163 if err != nil { |
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164 return nil, err |
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165 } |
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166 defer tx.Rollback() |
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167 |
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168 insertStmt, err := tx.PrepareContext(ctx, insertWaterwayAxisSQL) |
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169 if err != nil { |
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170 return nil, err |
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171 } |
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172 defer insertStmt.Close() |
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173 |
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174 // Delete the old features. |
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175 if _, err := tx.ExecContext(ctx, deleteWaterwayAxisSQL); err != nil { |
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176 return nil, err |
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177 } |
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178 |
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179 var ( |
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180 unsupported = stringCounter{} |
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181 missingProperties int |
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182 badProperties int |
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183 features int |
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184 ) |
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185 |
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186 if err := wfs.DownloadURLs(urls, func(r io.Reader) error { |
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187 rfc, err := wfs.ParseRawFeatureCollection(r) |
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188 if err != nil { |
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189 return fmt.Errorf("parsing GetFeature document failed: %v", err) |
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190 } |
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191 if rfc.CRS != nil { |
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192 crsName := rfc.CRS.Properties.Name |
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193 if epsg, err = wfs.CRSToEPSG(crsName); err != nil { |
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194 feedback.Error("Unsupported CRS: %d", crsName) |
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195 return err |
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196 } |
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197 } |
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198 |
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199 // No features -> ignore. |
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200 if rfc.Features == nil { |
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201 return nil |
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202 } |
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203 |
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204 feedback.Info("Using EPSG: %d", epsg) |
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205 |
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206 for _, feature := range rfc.Features { |
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207 if feature.Properties == nil || feature.Geometry.Coordinates == nil { |
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208 missingProperties++ |
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209 continue |
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210 } |
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211 |
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212 var props waterwayAxisProperties |
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213 |
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214 if err := json.Unmarshal(*feature.Properties, &props); err != nil { |
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215 badProperties++ |
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216 continue |
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217 } |
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218 |
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219 var nobjnam sql.NullString |
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220 if props.NObjNnm != nil { |
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221 nobjnam = sql.NullString{String: *props.NObjNnm, Valid: true} |
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222 } |
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223 |
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224 switch feature.Geometry.Type { |
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225 case "LineString": |
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226 var l lineSlice |
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227 if err := json.Unmarshal(*feature.Geometry.Coordinates, &l); err != nil { |
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228 return err |
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229 } |
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230 if _, err := insertStmt.ExecContext( |
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231 ctx, |
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232 l.asWKB(), |
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233 epsg, |
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234 props.ObjNam, |
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235 nobjnam, |
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236 ); err != nil { |
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237 return err |
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238 } |
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239 features++ |
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240 case "MultiLineString": |
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241 var ls []lineSlice |
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242 if err := json.Unmarshal(*feature.Geometry.Coordinates, &ls); err != nil { |
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243 return err |
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244 } |
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245 for _, l := range ls { |
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246 if _, err := insertStmt.ExecContext( |
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247 ctx, |
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248 l.asWKB(), |
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249 epsg, |
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250 props.ObjNam, |
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251 nobjnam, |
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252 ); err != nil { |
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253 return err |
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254 } |
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255 features++ |
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256 } |
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257 default: |
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258 unsupported[feature.Geometry.Type]++ |
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259 } |
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260 } |
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261 return nil |
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262 }); err != nil { |
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263 feedback.Error("Downloading features failed: %v", err) |
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264 return nil, err |
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265 } |
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266 |
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267 if badProperties > 0 { |
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268 feedback.Warn("Bad properties: %d", badProperties) |
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269 } |
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270 |
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271 if missingProperties > 0 { |
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272 feedback.Warn("Missing properties: %d", missingProperties) |
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273 } |
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274 |
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275 if len(unsupported) != 0 { |
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276 feedback.Warn("Unsupported types found: %s", unsupported) |
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277 } |
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278 |
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279 if features == 0 { |
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280 err := errors.New("No features found") |
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281 feedback.Error("%v", err) |
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282 return nil, err |
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283 } |
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284 |
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285 if err = tx.Commit(); err == nil { |
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286 feedback.Info("Storing %d features took %s", |
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287 features, time.Since(start)) |
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288 } |
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289 |
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290 return nil, err |
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291 } |