Mercurial > gemma
annotate pkg/imports/wx.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 | 614c6c766691 |
children | 1333f96f18d0 |
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 = `DELETE FROM waterway.waterway_axis` |
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84 insertWaterwayAxisSQL = ` |
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85 INSERT INTO waterway.waterway_axis (wtwaxs, objnam, nobjnam) |
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86 VALUES ( |
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87 ST_Transform(ST_GeomFromWKB($1, $2::integer), 4326)::geography, |
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88 $3, |
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89 $4 |
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90 )` |
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91 ) |
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92 |
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93 // Do executes the actual waterway axis import. |
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94 func (wx *WaterwayAxis) Do( |
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95 ctx context.Context, |
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96 importID int64, |
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97 conn *sql.Conn, |
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98 feedback Feedback, |
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99 ) (interface{}, error) { |
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100 |
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101 start := time.Now() |
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102 |
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103 feedback.Info("Import waterway axis") |
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104 |
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105 feedback.Info("Loading capabilities from %s", wx.URL) |
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106 caps, err := wfs.GetCapabilities(wx.URL) |
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107 if err != nil { |
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108 feedback.Error("Loading capabilities failed: %v", err) |
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109 return nil, err |
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110 } |
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111 |
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112 ft := caps.FindFeatureType(wx.FeatureType) |
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113 if ft == nil { |
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114 return nil, fmt.Errorf("Unknown feature type '%s'", wx.FeatureType) |
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115 } |
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116 |
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117 feedback.Info("Found feature type '%s", wx.FeatureType) |
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118 |
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119 epsg, err := wfs.CRSToEPSG(ft.DefaultCRS) |
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120 if err != nil { |
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121 feedback.Error("Unsupported CRS name '%s'", ft.DefaultCRS) |
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122 return nil, err |
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123 } |
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124 |
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125 if wx.SortBy != "" { |
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126 feedback.Info("Features will be sorted by '%s'", wx.SortBy) |
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127 } |
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128 |
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129 urls, err := wfs.GetFeaturesGET( |
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130 caps, wx.FeatureType, "application/json", wx.SortBy) |
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131 if err != nil { |
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132 feedback.Error("Cannot create GetFeature URLs. %v", err) |
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133 return nil, err |
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134 } |
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135 |
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136 tx, err := conn.BeginTx(ctx, nil) |
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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 defer tx.Rollback() |
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141 |
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142 insertStmt, err := tx.PrepareContext(ctx, insertWaterwayAxisSQL) |
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143 if err != nil { |
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144 return nil, err |
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145 } |
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146 defer insertStmt.Close() |
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147 |
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148 // Delete the old features. |
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149 if _, err := tx.ExecContext(ctx, deleteWaterwayAxisSQL); err != nil { |
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150 return nil, err |
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151 } |
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152 |
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153 var ( |
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154 unsupported = stringCounter{} |
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155 missingProperties int |
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156 badProperties int |
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157 features int |
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158 ) |
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159 |
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160 if err := wfs.DownloadURLs(urls, func(r io.Reader) error { |
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161 rfc, err := wfs.ParseRawFeatureCollection(r) |
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162 if err != nil { |
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163 return fmt.Errorf("parsing GetFeature document failed: %v", err) |
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164 } |
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165 if rfc.CRS != nil { |
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166 crsName := rfc.CRS.Properties.Name |
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167 if epsg, err = wfs.CRSToEPSG(crsName); err != nil { |
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168 feedback.Error("Unsupported CRS: %d", crsName) |
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169 return err |
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170 } |
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171 } |
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172 |
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173 // No features -> ignore. |
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174 if rfc.Features == nil { |
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175 return nil |
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176 } |
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177 |
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178 feedback.Info("Using EPSG: %d", epsg) |
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179 |
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180 for _, feature := range rfc.Features { |
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181 if feature.Properties == nil || feature.Geometry.Coordinates == nil { |
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182 missingProperties++ |
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183 continue |
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184 } |
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185 |
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186 var props waterwayAxisProperties |
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187 |
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188 if err := json.Unmarshal(*feature.Properties, &props); err != nil { |
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189 badProperties++ |
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190 continue |
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191 } |
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192 |
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193 var nobjnam sql.NullString |
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194 if props.NObjNnm != nil { |
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195 nobjnam = sql.NullString{String: *props.NObjNnm, Valid: true} |
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196 } |
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197 |
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198 switch feature.Geometry.Type { |
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199 case "LineString": |
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200 var l lineSlice |
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201 if err := json.Unmarshal(*feature.Geometry.Coordinates, &l); err != nil { |
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202 return err |
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203 } |
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204 if _, err := insertStmt.ExecContext( |
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205 ctx, |
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206 l.asWKB(), |
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207 epsg, |
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208 props.ObjNam, |
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209 nobjnam, |
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210 ); err != nil { |
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211 return err |
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212 } |
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213 features++ |
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214 case "MultiLineString": |
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215 var ls []lineSlice |
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216 if err := json.Unmarshal(*feature.Geometry.Coordinates, &ls); err != nil { |
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217 return err |
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218 } |
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219 for _, l := range ls { |
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220 if _, err := insertStmt.ExecContext( |
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221 ctx, |
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222 l.asWKB(), |
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223 epsg, |
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224 props.ObjNam, |
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225 nobjnam, |
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226 ); err != nil { |
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227 return err |
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228 } |
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229 features++ |
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230 } |
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231 default: |
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232 unsupported[feature.Geometry.Type]++ |
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233 } |
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234 } |
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235 return nil |
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236 }); err != nil { |
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237 feedback.Error("Downloading features failed: %v", err) |
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238 return nil, err |
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239 } |
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240 |
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241 if features == 0 { |
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242 err := errors.New("No features found") |
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243 feedback.Error("%v", err) |
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244 return nil, err |
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245 } |
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246 |
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247 if badProperties > 0 { |
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248 feedback.Warn("Bad properties: %d", badProperties) |
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249 } |
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250 |
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251 if missingProperties > 0 { |
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252 feedback.Warn("Missing properties: %d", missingProperties) |
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253 } |
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254 |
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255 if len(unsupported) != 0 { |
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256 feedback.Warn("Unsupported types found: %s", unsupported) |
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257 } |
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258 |
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259 if err = tx.Commit(); err == nil { |
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260 feedback.Info("Storing %d features took %s", |
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261 features, time.Since(start)) |
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262 } |
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263 |
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264 return nil, err |
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265 } |