Mercurial > gemma

annotate pkg/controllers/diff.go @ 2575:59e7a011d347

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Morphological differences: Moved TIN clipping to octree package and hide the technical details there.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 11 Mar 2019 14:50:04 +0100
parents 2833ff156cb2
children 647a58ee9ae9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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, 2019 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 "database/sql"
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18 "fmt"
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19 "log"
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20 "net/http"
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21 "sync"
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22 "time"
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23
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24 "golang.org/x/sync/semaphore"
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25
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26 "gemma.intevation.de/gemma/pkg/common"
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27 "gemma.intevation.de/gemma/pkg/models"
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28 "gemma.intevation.de/gemma/pkg/octree"
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29 )
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30
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31 // Only allow three diffence calculation at once.
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32 // TODO: Make this configurable?
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33 var diffCalculationSemaphore = semaphore.NewWeighted(int64(3))
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34
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35 func diffCalculation(
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36 input interface{},
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37 req *http.Request,
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38 conn *sql.Conn,
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39 ) (jr JSONResult, err error) {
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40
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41 start := time.Now()
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42
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43 ctx := req.Context()
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44
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45 // DoS counter measure.
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46 if err = diffCalculationSemaphore.Acquire(ctx, 1); err != nil {
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47 return
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48 }
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49 defer diffCalculationSemaphore.Release(1)
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50
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51 dci := input.(models.DiffCalculationInput)
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52
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53 minuendTree, err := octree.FromCache(
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54 ctx, conn,
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55 dci.Bottleneck, dci.Minuend.Time)
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56
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57 log.Printf("info: loading minuend octree took %s\n", time.Since(start))
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58 if err != nil {
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59 return
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60 }
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61
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62 if minuendTree == nil {
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63 err = JSONError{
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64 Code: http.StatusNotFound,
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65 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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66 dci.Bottleneck,
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67 dci.Minuend.Format(common.DateFormat)),
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68 }
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69 return
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70 }
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71
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72 start = time.Now()
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73
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74 subtrahendTree, err := octree.FromCache(
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75 ctx, conn,
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76 dci.Bottleneck, dci.Subtrahend.Time)
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77
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78 log.Printf("info: loading subtrahend octree took %s\n", time.Since(start))
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79 if err != nil {
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80 return
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81 }
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82
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83 if subtrahendTree == nil {
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84 err = JSONError{
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85 Code: http.StatusNotFound,
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86 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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87 dci.Bottleneck,
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88 dci.Subtrahend.Format(common.DateFormat)),
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89 }
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90 return
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91 }
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92
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93 // We need a slow path implementation for this.
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94 if minuendTree.EPSG != subtrahendTree.EPSG {
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95 err = JSONError{
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96 Code: http.StatusInternalServerError,
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97 Message: "Calculating differences between two different " +
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98 "EPSG code octrees are not supported, yet.",
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99 }
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100 return
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101 }
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102
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103 start = time.Now()
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104 points := minuendTree.Diff(subtrahendTree)
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105 log.Printf("info: A - B took %v\n", time.Since(start))
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106
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107 // The Triangulation and the loading of the clipping
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108 // polygon can be done concurrently.
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109
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110 jobs := make(chan func())
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111
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112 wg := new(sync.WaitGroup)
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113 for i := 0; i < 2; i++ {
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114 wg.Add(1)
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115 go func() {
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116 defer wg.Done()
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117 for job := range jobs {
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118 job()
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119 }
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120 }()
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121 }
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122
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123 var (
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124 tri *octree.Triangulation
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125 triErr error
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126 clip *octree.Polygon
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127 clipErr error
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128 )
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129
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130 jobs <- func() {
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131 start := time.Now()
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132 tri, triErr = points.Triangulate()
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133 log.Printf("info: triangulation took %v\n", time.Since(start))
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134 }
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135
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136 jobs <- func() {
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137 start := time.Now()
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138 clip, clipErr = octree.LoadClippingPolygon(
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139 ctx, conn,
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140 minuendTree.EPSG,
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141 dci.Bottleneck,
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142 dci.Minuend.Time,
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143 dci.Subtrahend.Time)
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144 log.Printf("info: loading clipping polygon took %v\n", time.Since(start))
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145 }
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146 close(jobs)
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147 wg.Wait()
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148
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149 switch {
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150 case triErr != nil && clipErr != nil:
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151 err = fmt.Errorf("%v %v", triErr, clipErr)
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152 return
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153 case triErr != nil:
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154 err = triErr
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155 return
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156 case clipErr != nil:
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157 err = clipErr
2572
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158 return
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159 }
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160
2575
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161 start = time.Now()
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162 tin := tri.Tin()
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163 removed := tin.Clip(clip)
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164 log.Printf("info: clipping TIN took %v\n", time.Since(start))
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165
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166 start = time.Now()
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167 log.Printf("info: Number of triangles to clip: %d\n", len(removed))
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168 builder := octree.NewBuilder(tin)
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169 builder.Build(removed)
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170 log.Printf("info: building octree took %v\n", time.Since(start))
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171
2570
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172 // TODO: Implement me!
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173
c4242b9d59fe Morphological differences: Added endpoint stub POST /api/diff
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parents:
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174 return
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parents:
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175 }