Mercurial > gemma

annotate pkg/imports/fm.go @ 4905:8cb201b551b3 fairway-marks-import

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Replace bogus usage of pointer for type intrusion
author Tom Gottfried <tom@intevation.de>
date Fri, 07 Feb 2020 12:23:46 +0100
parents 53d929f658f3
children 21fea90f4002
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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) 2020 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 // * Tom Gottfried <tom.gottfried@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 "encoding/json"
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18 "fmt"
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19 "io"
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20
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21 "gemma.intevation.de/gemma/pkg/wfs"
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22 )
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23
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24 // FairwayMarks is a struct
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25 // to be used as the basis for imports of
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26 // specific types for fairway marks.
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27 type FairwayMarks struct {
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28 // URL the GetCapabilities URL of the WFS service.
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29 URL string `json:"url"`
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30 // FeatureType selects the feature type of the WFS service.
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31 FeatureType string `json:"feature-type"`
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32 // SortBy works around misconfigured services to
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33 // establish a sort order to get the features.
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34 SortBy string `json:"sort-by"`
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35 // User is an optional username for Basic Auth.
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36 User string `json:"user,omitempty"`
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37 // Password is an optional password for Basic Auth.
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38 Password string `json:"password,omitempty"`
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39 }
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40
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41 // Properties common to all types of fairway marks
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42 type fairwayMarksProperties struct {
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43 Datsta *string `json:"hydro_datsta"`
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44 Datend *string `json:"hydro_datend"`
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45 Persta *string `json:"hydro_persta"`
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46 Perend *string `json:"hydro_perend"`
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47 Objnam *string `json:"hydro_objnam"`
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48 Nobjnm *string `json:"hydro_nobjnm"`
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49 Inform *string `json:"hydro_inform"`
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50 Ninfom *string `json:"hydro_ninfom"`
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51 Scamin *int `json:"hydro_scamin"`
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52 Picrep *string `json:"hydro_picrep"`
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53 Txtdsc *string `json:"hydro_txtdsc"`
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54 Sordat *string `json:"hydro_sordat"`
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55 Sorind *string `json:"hydro_sorind"`
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56 }
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57
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58 // Common operation of FM imports to get features from WFS service
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59 func getFMFeatures(
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60 feedback Feedback,
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61 fm FairwayMarks,
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62 // Constructor returning a struct representing featuretype's properties
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63 newProps func() interface{},
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64 ) (
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65 // Elements can be converted to []interface{}{p, fp} with
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66 // p being a pointSlice and fp of the type of argument props.
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67 fms [][]interface{},
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68 epsg int,
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69 err error,
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70 ) {
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71
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72 feedback.Info("Loading capabilities from %s", fm.URL)
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73 caps, err := wfs.GetCapabilities(fm.URL)
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74 if err != nil {
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75 feedback.Error("Loading capabilities failed: %v", err)
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76 return
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77 }
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78
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79 ft := caps.FindFeatureType(fm.FeatureType)
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80 if ft == nil {
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81 err = fmt.Errorf("unknown feature type '%s'", fm.FeatureType)
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82 return
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83 }
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84
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85 feedback.Info("Found feature type '%s", fm.FeatureType)
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86
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87 epsg, err = wfs.CRSToEPSG(ft.DefaultCRS)
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88 if err != nil {
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89 feedback.Error("Unsupported CRS: '%s'", ft.DefaultCRS)
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90 return
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91 }
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92
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93 if fm.SortBy != "" {
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94 feedback.Info("Features will be sorted by '%s'", fm.SortBy)
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95 }
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96
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97 dl, err := wfs.GetFeatures(caps, fm.FeatureType, fm.SortBy)
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98 if err != nil {
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99 feedback.Error("Cannot create GetFeature URLs. %v", err)
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100 return
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101 }
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102
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103 var (
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104 unsupported = stringCounter{}
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105 missingProperties int
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106 badProperties int
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107 )
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108
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109 err = dl.Download(fm.User, fm.Password, func(url string, r io.Reader) error {
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110 feedback.Info("Get features from: '%s'", url)
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111 rfc, err := wfs.ParseRawFeatureCollection(r)
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112 if err != nil {
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113 return fmt.Errorf("parsing GetFeature document failed: %v", err)
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114 }
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115 if rfc.CRS != nil {
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116 crsName := rfc.CRS.Properties.Name
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117 if epsg, err = wfs.CRSToEPSG(crsName); err != nil {
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118 feedback.Error("Unsupported CRS: %d", crsName)
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119 return err
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120 }
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121 }
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122
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123 // No features -> ignore.
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124 if rfc.Features == nil {
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125 return nil
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126 }
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127
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128 feedback.Info("Using EPSG: %d", epsg)
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129
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130 for _, feature := range rfc.Features {
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131 if feature.Properties == nil || feature.Geometry.Coordinates == nil {
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132 missingProperties++
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133 continue
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134 }
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135
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136 props := newProps()
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137 if err := json.Unmarshal(*feature.Properties, &props); err != nil {
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138 badProperties++
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139 continue
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140 }
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141
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142 switch feature.Geometry.Type {
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143 case "Point":
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144 var p pointSlice
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145 if err := json.Unmarshal(*feature.Geometry.Coordinates, &p); err != nil {
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146 return err
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147 }
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148
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149 f := []interface{}{p, props}
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150 fms = append(fms, f)
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151 default:
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152 unsupported[feature.Geometry.Type]++
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153 }
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154 }
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155 return nil
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156 })
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157 if err != nil {
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158 return
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159 }
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160
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161 if badProperties > 0 {
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162 feedback.Warn("Bad properties: %d", badProperties)
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163 }
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164
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165 if missingProperties > 0 {
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166 feedback.Warn("Missing properties: %d", missingProperties)
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167 }
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168
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169 if len(unsupported) != 0 {
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170 feedback.Warn("Unsupported types found: %s", unsupported)
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171 }
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172
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173 feedback.Info("Found %d usable features in data source", len(fms))
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174
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175 return
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176 }