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annotate pkg/imports/wx.go @ 1679:2dc7768be0e4

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Waterway axis import: More on reading data from WFS. TODO: Parse to concrete features.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 26 Dec 2018 21:01:29 +0100
parents 53304db85888
children de8089944b19
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"
1679
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19 "fmt"
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20 "io"
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21 "strings"
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22 "time"
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23
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24 "gemma.intevation.de/gemma/pkg/common"
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25 "gemma.intevation.de/gemma/pkg/wfs"
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26 )
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27
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28 type WaterwayAxis struct {
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29 URL string `json:"url"`
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30 FeatureType string `json:"feature-type"`
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31 SortBy string `json:"sort-by"`
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32 }
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33
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34 const WXJobKind JobKind = "wx"
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35
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36 type wxJobCreator struct{}
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37
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38 func init() {
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39 RegisterJobCreator(WXJobKind, wxJobCreator{})
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40 }
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41
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42 func (wxJobCreator) Description() string {
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43 return "waterway axis"
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44 }
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45
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46 func (wxJobCreator) Create(_ JobKind, data string) (Job, error) {
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47 wx := new(WaterwayAxis)
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48 if err := common.FromJSONString(data, wx); err != nil {
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49 return nil, err
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50 }
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51 return wx, nil
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52 }
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53
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54 func (wxJobCreator) Depends() []string {
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55 return []string{
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56 "waterway_axis",
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57 }
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58 }
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59
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60 // StageDone is a NOP for waterway axis imports.
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61 func (wxJobCreator) StageDone(context.Context, *sql.Tx, int64) error {
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62 return nil
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63 }
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64
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65 // CleanUp for waterway imports is a NOP.
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66 func (*WaterwayAxis) CleanUp() error { return nil }
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67
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68 // Do executes the actual waterway exis import.
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69 func (wx *WaterwayAxis) Do(
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70 ctx context.Context,
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71 importID int64,
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72 conn *sql.Conn,
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73 feedback Feedback,
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74 ) (interface{}, error) {
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75
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76 start := time.Now()
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77
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78 feedback.Info("Import waterway axis")
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79
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80 feedback.Info("Loading capabilities from %s", wx.URL)
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81 caps, err := wfs.GetCapabilities(wx.URL)
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82 if err != nil {
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83 feedback.Error("Loading capabilities failed: %v", err)
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84 return nil, err
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85 }
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86
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87 ft := caps.FindFeatureType(wx.FeatureType)
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88 if ft == nil {
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89 err := fmt.Errorf("Unknown feature type '%s'", wx.FeatureType)
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90 feedback.Error("%v", err)
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91 return nil, err
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92 }
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93
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94 urls, err := wfs.GetFeaturesGET(
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95 caps, wx.FeatureType, "application/json", wx.SortBy)
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96 if err != nil {
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97 feedback.Error("Cannot create GetFeature URLs. %v", err)
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98 return nil, err
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99 }
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100
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101 var crsName string
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102
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103 unsupportedTypes := map[string]int{}
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104
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105 if err := wfs.DownloadURLs(urls, func(r io.Reader) error {
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106 rfc, err := wfs.ParseRawFeatureCollection(r)
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107 if err != nil {
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108 return err
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109 }
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110 if crsName != "" && rfc.CRS != nil {
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111 crsName = rfc.CRS.Properties.Name
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112 }
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113
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114 // No features -> ignore.
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115 if rfc.Features == nil {
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116 return nil
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117 }
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118 for _, feature := range rfc.Features {
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119 switch feature.Geometry.Type {
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120 case "LineString":
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121 // TODO: Parse concrete features.
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122 case "MultiLineString":
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123 // TODO: Parse concrete features.
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124 default:
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125 unsupportedTypes[feature.Geometry.Type]++
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126 }
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127 }
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128 return nil
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129 }); err != nil {
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130 feedback.Error("Downloading features failed: %v", err)
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131 return nil, err
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132 }
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133
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134 if len(unsupportedTypes) != 0 {
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135 var b strings.Builder
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136 for t, c := range unsupportedTypes {
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137 if b.Len() > 0 {
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138 b.WriteString(", ")
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139 }
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140 b.WriteString(fmt.Sprintf("%s: %d", t, c))
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141 }
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142 feedback.Warn("Unsupported types found: %s", b.String())
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143 }
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144
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145 if crsName == "" {
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146 crsName = ft.DefaultCRS
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147 }
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148
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149 epsg, err := wfs.CRSToEPSG(crsName)
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150 if err != nil {
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151 feedback.Error("Unsupported CRS name '%s'", crsName)
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152 return nil, err
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153 }
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154
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155 feedback.Info("using ESPG: %d", epsg)
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156
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157 // TODO: Store extracted features.
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158
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159 feedback.Info("Storing took %s", time.Since(start))
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160
1675
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161 return nil, nil
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162 }