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annotate pkg/imports/fm.go @ 4906:21fea90f4002 fairway-marks-import

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Avoid unnecessary pointer to pointer
author Tom Gottfried <tom@intevation.de>
date Fri, 07 Feb 2020 12:35:11 +0100
parents 8cb201b551b3
children 644cb7c175f3
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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 pointer to struct
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63 // representing featuretype's properties
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64 newProps func() interface{},
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65 ) (
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66 // Elements can be converted to []interface{}{p, fp} with
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67 // p being a pointSlice and fp of the type of argument props.
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68 fms [][]interface{},
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69 epsg int,
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70 err error,
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71 ) {
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72
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73 feedback.Info("Loading capabilities from %s", fm.URL)
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74 caps, err := wfs.GetCapabilities(fm.URL)
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75 if err != nil {
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76 feedback.Error("Loading capabilities failed: %v", err)
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77 return
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78 }
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79
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80 ft := caps.FindFeatureType(fm.FeatureType)
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81 if ft == nil {
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82 err = fmt.Errorf("unknown feature type '%s'", fm.FeatureType)
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83 return
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84 }
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85
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86 feedback.Info("Found feature type '%s", fm.FeatureType)
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87
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88 epsg, err = wfs.CRSToEPSG(ft.DefaultCRS)
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89 if err != nil {
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90 feedback.Error("Unsupported CRS: '%s'", ft.DefaultCRS)
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91 return
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92 }
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93
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94 if fm.SortBy != "" {
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95 feedback.Info("Features will be sorted by '%s'", fm.SortBy)
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96 }
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97
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98 dl, err := wfs.GetFeatures(caps, fm.FeatureType, fm.SortBy)
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99 if err != nil {
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100 feedback.Error("Cannot create GetFeature URLs. %v", err)
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101 return
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102 }
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103
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104 var (
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105 unsupported = stringCounter{}
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106 missingProperties int
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107 badProperties int
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108 )
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109
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110 err = dl.Download(fm.User, fm.Password, func(url string, r io.Reader) error {
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111 feedback.Info("Get features from: '%s'", url)
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112 rfc, err := wfs.ParseRawFeatureCollection(r)
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113 if err != nil {
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114 return fmt.Errorf("parsing GetFeature document failed: %v", err)
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115 }
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116 if rfc.CRS != nil {
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117 crsName := rfc.CRS.Properties.Name
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118 if epsg, err = wfs.CRSToEPSG(crsName); err != nil {
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119 feedback.Error("Unsupported CRS: %d", crsName)
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120 return err
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121 }
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122 }
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123
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124 // No features -> ignore.
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125 if rfc.Features == nil {
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126 return nil
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127 }
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128
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129 feedback.Info("Using EPSG: %d", epsg)
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130
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131 for _, feature := range rfc.Features {
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132 if feature.Properties == nil || feature.Geometry.Coordinates == nil {
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133 missingProperties++
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134 continue
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135 }
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136
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137 props := newProps()
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138 if err := json.Unmarshal(*feature.Properties, props); err != nil {
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139 badProperties++
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140 continue
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141 }
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142
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143 switch feature.Geometry.Type {
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144 case "Point":
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145 var p pointSlice
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146 if err := json.Unmarshal(*feature.Geometry.Coordinates, &p); err != nil {
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147 return err
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148 }
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149
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150 f := []interface{}{p, props}
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151 fms = append(fms, f)
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152 default:
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153 unsupported[feature.Geometry.Type]++
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154 }
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155 }
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156 return nil
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157 })
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158 if err != nil {
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159 return
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160 }
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161
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162 if badProperties > 0 {
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163 feedback.Warn("Bad properties: %d", badProperties)
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164 }
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165
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166 if missingProperties > 0 {
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167 feedback.Warn("Missing properties: %d", missingProperties)
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168 }
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169
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170 if len(unsupported) != 0 {
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171 feedback.Warn("Unsupported types found: %s", unsupported)
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172 }
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173
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174 feedback.Info("Found %d usable features in data source", len(fms))
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175
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176 return
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177 }