Mercurial > gemma
annotate pkg/controllers/cross.go @ 2685:39a05f8c34e6 import-overview-rework
import_overview: Refactoring of detailed information.
When the entry is opened, a request is made to retrieve the
detailed information for this entry. It contains the log
protocol information as well as the executive summary.
This is passed down to child components of the entry.
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Fri, 15 Mar 2019 13:42:49 +0100 |
parents | 5afca5bc1d7a |
children | c50d955372b9 |
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 controllers |
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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 "fmt" |
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20 "log" |
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21 "net/http" |
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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/models" |
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26 "gemma.intevation.de/gemma/pkg/octree" |
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27 ) |
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28 |
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29 func reproject( |
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30 ctx context.Context, |
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31 rp *models.Reprojector, |
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32 src models.GeoJSONLineCoordinates, |
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33 ) (models.GeoJSONLineCoordinates, error) { |
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34 |
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35 dst := make(models.GeoJSONLineCoordinates, len(src)) |
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36 for i, s := range src { |
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37 var err error |
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38 if dst[i].Lat, dst[i].Lon, err = rp.Reproject( |
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39 ctx, |
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40 s.Lat, s.Lon, |
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41 ); err != nil { |
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42 return nil, err |
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43 } |
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44 } |
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45 return dst, nil |
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46 } |
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47 |
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48 const projectBackSQL = ` |
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49 SELECT ST_AsBinary( |
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50 ST_Transform(ST_GeomFromWKB($2, $1::integer), 4326))` |
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51 |
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52 func projectBack( |
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53 ctx context.Context, |
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54 line octree.MultiLineStringZ, |
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55 epsg uint32, |
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56 conn *sql.Conn, |
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57 ) (models.GeoJSONMultiLineCoordinatesZ, error) { |
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58 |
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59 var mls models.GeoJSONMultiLineCoordinatesZ |
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60 err := conn.QueryRowContext( |
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61 ctx, projectBackSQL, |
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62 epsg, line.AsWKB(), |
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63 ).Scan(&mls) |
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64 |
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65 return mls, err |
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66 } |
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67 |
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68 func crossSection( |
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69 input interface{}, |
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70 req *http.Request, |
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71 conn *sql.Conn, |
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72 ) (jr JSONResult, err error) { |
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73 |
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74 csi := input.(*models.CrossSectionInput) |
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75 |
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76 start := time.Now() |
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77 ctx := req.Context() |
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78 |
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79 tree, err := octree.FromCache( |
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80 ctx, conn, |
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81 csi.Properties.Bottleneck, csi.Properties.Date.Time) |
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82 |
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83 log.Printf("info: loading octree took %s\n", time.Since(start)) |
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84 if err != nil { |
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85 return |
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86 } |
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87 |
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88 if tree == nil { |
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89 err = JSONError{ |
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90 Code: http.StatusNotFound, |
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91 Message: fmt.Sprintf("Cannot find survey for %s/%s.", |
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92 csi.Properties.Bottleneck, |
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93 csi.Properties.Date.Time), |
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94 } |
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95 return |
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96 } |
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97 |
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98 // The coordinate system of the octree is an UTM projection. |
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99 // The input coordinates are in WGS84. |
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100 // So we need to reproject them. |
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101 |
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102 start = time.Now() |
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103 |
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104 var rp *models.Reprojector |
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105 if rp, err = models.NewReprojector( |
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106 ctx, conn, |
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107 models.WGS84, tree.EPSG, |
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108 ); err != nil { |
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109 return |
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110 } |
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111 defer rp.Close() |
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112 |
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113 coords, err := reproject(ctx, rp, csi.Geometry.Coordinates) |
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114 |
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115 log.Printf("info: transforming input coords took %s\n", time.Since(start)) |
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116 if err != nil { |
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117 return |
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118 } |
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119 |
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120 start = time.Now() |
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121 |
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122 var segments octree.MultiLineStringZ |
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123 |
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124 for i := 0; i < len(coords)-1; i++ { |
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125 c1 := &coords[i] |
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126 c2 := &coords[i+1] |
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127 |
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128 verticalLine := octree.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon) |
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129 |
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130 var line octree.MultiLineStringZ |
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131 tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *octree.Triangle) { |
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132 if ls := verticalLine.Intersection(t); len(ls) > 0 { |
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133 line = append(line, ls) |
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134 } |
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135 }) |
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136 |
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137 if len(line) > 0 { |
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138 log.Printf("info: line length: %d\n", len(line)) |
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139 // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon). |
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140 // Sort them by project them on this line. |
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141 joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon) |
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142 log.Printf("info: joined length: %d\n", len(joined)) |
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143 segments = append(segments, joined...) |
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144 } |
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145 |
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146 } |
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147 log.Printf("info: octree traversal took %s\n", time.Since(start)) |
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148 |
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149 start = time.Now() |
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150 |
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151 var joined models.GeoJSONMultiLineCoordinatesZ |
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152 joined, err = projectBack( |
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153 ctx, |
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154 segments, tree.EPSG, |
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155 conn, |
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156 ) |
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157 |
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158 log.Printf("info: projecting back took %s\n", time.Since(start)) |
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159 if err != nil { |
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160 return |
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161 } |
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162 |
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163 jr = JSONResult{ |
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164 Result: &models.CrossSectionOutput{ |
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165 Type: "Feature", |
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166 Geometry: models.CrossSectionOutputGeometry{ |
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167 Type: "MultiLineString", |
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168 Coordinates: joined, |
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169 }, |
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170 Properties: map[string]interface{}{ |
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171 "waterlevel": map[string]interface{}{ |
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172 // TODO: Fetch values from database. |
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173 "value": float64(50), |
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174 "when": start.Format(common.TimeFormat), |
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175 }, |
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176 }, |
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177 }, |
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178 } |
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179 |
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180 return |
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181 } |