Mercurial > gemma

annotate pkg/controllers/cross.go @ 838:03e966b71a88

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cross profile controller: Handle real errors before checking if there is no matching survey.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 28 Sep 2018 10:25:09 +0200
parents 232f3f345cf0
children a244b18cb916
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1 package controllers
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2
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3 import (
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4 "context"
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5 "database/sql"
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6 "fmt"
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7 "log"
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8 "net/http"
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9 "time"
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10
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11 "gemma.intevation.de/gemma/pkg/models"
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12 "gemma.intevation.de/gemma/pkg/octree"
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13 )
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14
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15 const WGS84 = 4326
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16
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17 func reproject(
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18 rp *models.Reprojector,
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19 src models.GeoJSONLineCoordinates,
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20 ctx context.Context,
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21 ) (models.GeoJSONLineCoordinates, error) {
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22
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23 dst := make(models.GeoJSONLineCoordinates, len(src))
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24 for i, s := range src {
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25 var err error
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26 if dst[i].Lat, dst[i].Lon, err = rp.Reproject(
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27 s.Lat, s.Lon, ctx,
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28 ); err != nil {
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29 return nil, err
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30 }
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31 }
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32 return dst, nil
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33 }
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34
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35 func projectBack(
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36 rp *models.Reprojector,
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37 lines octree.MultiLineStringZ,
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38 ctx context.Context,
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39 ) (models.GeoJSONMultiLineCoordinatesZ, error) {
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40
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41 out := make(models.GeoJSONMultiLineCoordinatesZ, len(lines))
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42
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43 for i, segment := range lines {
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44
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45 coords := make(models.GeoJSONLineCoordinatesZ, len(segment))
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46 out[i] = coords
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47 for j, v := range segment {
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48 lat, lon, err := rp.Reproject(v.X, v.Y, ctx)
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49 if err != nil {
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50 return nil, err
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51 }
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52 coords[j] = models.GeoJSONCoordinateZ{Lat: lat, Lon: lon, Z: v.Z}
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53 }
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54 }
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55 return out, nil
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56 }
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57
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58 const clipSQL = `
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59 SELECT ST_AsBinary(ST_Transform(ST_Multi(ST_Intersection(
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60 ST_Transform(area::geometry, $1::integer),
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61 ST_GeomFromWKB($2, $1::integer))), 4326))
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62 FROM waterway.sounding_results
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63 WHERE bottleneck_id = $3 AND date_info = $4::date`
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64
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65 func clipAgainstArea(
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66 line octree.MultiLineStringZ,
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67 epsg uint32,
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68 bottleneck string,
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69 dateInfo time.Time,
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70 conn *sql.Conn,
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71 ctx context.Context,
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72 ) (models.GeoJSONMultiLineCoordinatesZ, error) {
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73
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74 var mls models.GeoJSONMultiLineCoordinatesZ
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75 err := conn.QueryRowContext(
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76 ctx, clipSQL,
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77 epsg, line.AsWKB(),
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78 bottleneck, dateInfo,
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79 ).Scan(&mls)
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80
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81 return mls, err
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82 }
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83
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84 func crossSection(
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85 input interface{},
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86 req *http.Request,
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87 conn *sql.Conn,
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88 ) (jr JSONResult, err error) {
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89
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90 csi := input.(*models.CrossSectionInput)
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91
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92 start := time.Now()
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93
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94 tree, err := octree.Cache.Get(
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95 csi.Properties.Bottleneck, csi.Properties.Date.Time,
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96 conn, req.Context())
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97
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98 log.Printf("loading octree took: %s\n", time.Since(start))
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99 if err != nil {
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100 return
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101 }
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102
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103 if tree == nil {
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104 err = JSONError{
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105 Code: http.StatusNotFound,
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106 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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107 csi.Properties.Bottleneck,
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108 csi.Properties.Date.Time),
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109 }
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110 return
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111 }
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112
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113 // The coordinate system of the octree is an UTM projection.
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114 // The input coordinates are in WGS84.
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115 // So we need to reproject them.
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116
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117 start = time.Now()
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118
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119 var rp *models.Reprojector
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120 if rp, err = models.NewReprojector(
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121 conn, req.Context(),
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122 WGS84, tree.EPSG,
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123 ); err != nil {
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124 return
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125 }
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126 defer rp.Close()
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127
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128 coords, err := reproject(rp, csi.Geometry.Coordinates, req.Context())
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129
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130 log.Printf("transforming input coords took: %s\n", time.Since(start))
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131 if err != nil {
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132 return
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133 }
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134
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135 start = time.Now()
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136
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137 var segments octree.MultiLineStringZ
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138
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139 for i := 0; i < len(coords)-1; i++ {
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140 c1 := &coords[i]
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141 c2 := &coords[i+1]
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142
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143 verticalLine := octree.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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144
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145 var line octree.MultiLineStringZ
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146 tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *octree.Triangle) {
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147 if ls := verticalLine.Intersection(t); len(ls) > 0 {
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148 line = append(line, ls)
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149 }
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150 })
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151
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152 if len(line) > 0 {
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153 log.Printf("line length: %d\n", len(line))
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154 // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon).
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155 // Sort them by project them on this line.
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156 joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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157 log.Printf("joined length: %d\n", len(joined))
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158 segments = append(segments, joined...)
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159 }
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160
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161 }
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162 log.Printf("octree traversal took: %s\n", time.Since(start))
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163
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164 start = time.Now()
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165
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166 var joined models.GeoJSONMultiLineCoordinatesZ
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167 joined, err = clipAgainstArea(
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168 segments, tree.EPSG,
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169 csi.Properties.Bottleneck, csi.Properties.Date.Time,
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170 conn, req.Context(),
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171 )
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172
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173 log.Printf("clipping and projecting back took: %s\n", time.Since(start))
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174 if err != nil {
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175 return
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176 }
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177
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178 jr = JSONResult{
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179 Result: &models.CrossSectionOutput{
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180 Type: "Feature",
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181 Geometry: models.CrossSectionOutputGeometry{
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182 Type: "MultiLineString",
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183 Coordinates: joined,
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184 },
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185 Properties: map[string]interface{}{},
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186 },
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187 }
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188
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189 return
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190 }