Mercurial > gemma
annotate pkg/controllers/diff.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 | 857bb070b9f1 |
children | 2a079d0a71c1 |
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, 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 const ( |
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32 contourTolerance = 0.1 |
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33 contourStep = 0.1 |
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34 ) |
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35 |
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36 const ( |
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37 diffIDSQL = ` |
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38 SELECT sd.id FROM |
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39 caching.sounding_differences sd JOIN |
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40 waterway.sounding_results srm ON sd.minuend = srm.id JOIN |
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41 waterway.sounding_results srs ON sd.subtrahend = srs.id |
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42 WHERE srm.bottleneck_id = srs.bottleneck_id AND |
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43 srm.bottleneck_id = $1 AND |
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44 srm.date_info = $2::date AND |
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45 srs.date_info = $3::date |
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46 ` |
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47 insertDiffSQL = ` |
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48 WITH soundings AS ( |
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49 SELECT sr.id AS id, sr.date_info AS date_info FROM |
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50 waterway.sounding_results sr |
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51 WHERE sr.bottleneck_id = $1 |
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52 ) |
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53 INSERT INTO caching.sounding_differences (minuend, subtrahend) |
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54 SELECT m.id, s.id FROM soundings m, soundings s |
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55 WHERE m.date_info = $2::date AND s.date_info = $3::date |
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56 RETURNING id |
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57 ` |
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58 insertDiffContourSQL = ` |
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59 INSERT INTO caching.sounding_differences_contour_lines ( |
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60 sounding_differences_id, |
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61 height, |
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62 lines |
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63 ) |
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64 SELECT |
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65 $5, |
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66 $4, |
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67 ST_Transform( |
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68 ST_Multi( |
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69 ST_CollectionExtract( |
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70 ST_SimplifyPreserveTopology( |
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71 ST_Multi(ST_Collectionextract( |
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72 ST_MakeValid(ST_GeomFromWKB($1, $2::integer)), 2)), |
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73 $3 |
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74 ), |
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75 2 |
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76 ) |
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77 ), |
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78 4326 |
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79 ) |
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80 ` |
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81 ) |
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82 |
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83 // Only allow three diffence calculation at once. |
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84 // TODO: Make this configurable? |
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85 var diffCalculationSemaphore = semaphore.NewWeighted(int64(3)) |
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86 |
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87 func diffCalculation( |
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88 input interface{}, |
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89 req *http.Request, |
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90 conn *sql.Conn, |
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91 ) (jr JSONResult, err error) { |
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92 |
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93 begin := time.Now() |
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94 start := begin |
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95 |
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96 dci := input.(*models.DiffCalculationInput) |
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97 |
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98 ctx := req.Context() |
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99 |
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100 var id int64 |
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101 err = conn.QueryRowContext( |
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102 ctx, |
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103 diffIDSQL, |
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104 dci.Bottleneck, |
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105 dci.Minuend.Time, |
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106 dci.Subtrahend.Time, |
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107 ).Scan(&id) |
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108 |
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109 switch { |
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110 case err == sql.ErrNoRows: |
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111 // We need to calculate it. |
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112 case err != nil: |
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113 return |
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114 default: |
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115 // We already have this diff |
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116 jr = JSONResult{ |
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117 Result: map[string]int64{"id": id}, |
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118 } |
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119 return |
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120 } |
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121 |
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122 // DoS counter measure. |
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123 if err = diffCalculationSemaphore.Acquire(ctx, 1); err != nil { |
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124 return |
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125 } |
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126 defer diffCalculationSemaphore.Release(1) |
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127 |
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128 minuendTree, err := octree.FromCache( |
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129 ctx, conn, |
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130 dci.Bottleneck, dci.Minuend.Time) |
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131 |
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132 log.Printf("info: loading minuend octree took %s\n", time.Since(start)) |
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133 if err != nil { |
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134 return |
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135 } |
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136 |
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137 if minuendTree == nil { |
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138 err = JSONError{ |
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139 Code: http.StatusNotFound, |
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140 Message: fmt.Sprintf("Cannot find survey for %s/%s.", |
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141 dci.Bottleneck, |
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142 dci.Minuend.Format(common.DateFormat)), |
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143 } |
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144 return |
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145 } |
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146 |
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147 start = time.Now() |
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148 |
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149 subtrahendTree, err := octree.FromCache( |
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150 ctx, conn, |
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151 dci.Bottleneck, dci.Subtrahend.Time) |
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152 |
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153 log.Printf("info: loading subtrahend octree took %s\n", time.Since(start)) |
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154 if err != nil { |
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155 return |
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156 } |
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157 |
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158 if subtrahendTree == nil { |
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159 err = JSONError{ |
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160 Code: http.StatusNotFound, |
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161 Message: fmt.Sprintf("Cannot find survey for %s/%s.", |
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162 dci.Bottleneck, |
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163 dci.Subtrahend.Format(common.DateFormat)), |
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164 } |
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165 return |
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166 } |
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167 |
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168 // We need a slow path implementation for this. |
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169 if minuendTree.EPSG != subtrahendTree.EPSG { |
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170 err = JSONError{ |
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171 Code: http.StatusInternalServerError, |
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172 Message: "Calculating differences between two different " + |
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173 "EPSG code octrees are not supported, yet.", |
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174 } |
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175 return |
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176 } |
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177 |
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178 start = time.Now() |
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179 points := minuendTree.Diff(subtrahendTree) |
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180 log.Printf("info: A - B took %v\n", time.Since(start)) |
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181 |
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182 // The Triangulation and the loading of the clipping |
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183 // polygon can be done concurrently. |
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184 |
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185 jobs := make(chan func()) |
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186 |
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187 wg := new(sync.WaitGroup) |
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188 for i := 0; i < 2; i++ { |
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189 wg.Add(1) |
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190 go func() { |
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191 defer wg.Done() |
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192 for job := range jobs { |
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193 job() |
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194 } |
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195 }() |
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196 } |
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197 |
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198 var ( |
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199 tri *octree.Triangulation |
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200 triErr error |
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201 clip *octree.Polygon |
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202 clipErr error |
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203 ) |
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204 |
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205 jobs <- func() { |
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206 start := time.Now() |
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207 tri, triErr = points.Triangulate() |
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208 log.Printf("info: triangulation took %v\n", time.Since(start)) |
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209 } |
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210 |
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211 jobs <- func() { |
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212 start := time.Now() |
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213 clip, clipErr = octree.LoadClippingPolygon( |
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214 ctx, conn, |
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215 minuendTree.EPSG, |
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216 dci.Bottleneck, |
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217 dci.Minuend.Time, |
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218 dci.Subtrahend.Time) |
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219 log.Printf("info: loading clipping polygon took %v\n", time.Since(start)) |
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220 } |
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221 close(jobs) |
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222 wg.Wait() |
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223 |
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224 switch { |
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225 case triErr != nil && clipErr != nil: |
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226 err = fmt.Errorf("%v %v", triErr, clipErr) |
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227 return |
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228 case triErr != nil: |
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229 err = triErr |
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230 return |
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231 case clipErr != nil: |
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232 err = clipErr |
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233 return |
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234 } |
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235 |
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236 start = time.Now() |
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237 tin := tri.Tin() |
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238 removed := tin.Clip(clip) |
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239 log.Printf("info: clipping TIN took %v\n", time.Since(start)) |
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240 |
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241 start = time.Now() |
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242 log.Printf("info: Number of triangles to clip: %d\n", len(removed)) |
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243 builder := octree.NewBuilder(tin) |
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244 builder.Build(removed) |
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245 log.Printf("info: building octree took %v\n", time.Since(start)) |
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246 |
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247 tree := builder.Tree() |
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248 |
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249 log.Printf("info: min/max: %f %f\n", tree.Min.Z, tree.Max.Z) |
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250 |
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251 heights := octree.SampleDiffHeights( |
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252 tree.Min.Z, tree.Max.Z, contourStep) |
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253 log.Printf("info: num heights: %d\n", len(heights)) |
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254 |
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255 start = time.Now() |
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256 |
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257 // XXX: Maybe we should start this transaction earlier!? |
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258 var tx *sql.Tx |
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259 if tx, err = conn.BeginTx(ctx, nil); err != nil { |
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260 return |
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261 } |
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262 defer tx.Rollback() |
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263 |
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264 var stmt *sql.Stmt |
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265 if stmt, err = tx.PrepareContext(ctx, insertDiffContourSQL); err != nil { |
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266 return |
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267 } |
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268 defer stmt.Close() |
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269 |
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270 if err = tx.QueryRowContext( |
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271 ctx, |
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272 insertDiffSQL, |
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273 dci.Bottleneck, |
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274 dci.Minuend.Time, |
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275 dci.Subtrahend.Time, |
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276 ).Scan(&id); err != nil { |
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277 return |
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278 } |
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279 |
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280 octree.DoContours(tree, heights, func(res *octree.ContourResult) { |
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281 if err == nil && len(res.Lines) > 0 { |
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282 _, err = stmt.ExecContext( |
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283 ctx, |
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284 res.Lines.AsWKB2D(), |
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285 minuendTree.EPSG, |
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286 contourTolerance, |
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287 res.Height, |
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288 id, |
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289 ) |
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290 } |
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291 }) |
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292 |
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293 log.Printf("info: calculating and storing iso lines took %v\n", |
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294 time.Since(start)) |
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295 |
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296 if err != nil { |
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297 return |
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298 } |
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299 |
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300 if err = tx.Commit(); err != nil { |
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301 log.Printf("info: difference calculation failed after %v\n", |
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302 time.Since(begin)) |
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303 return |
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304 } |
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305 log.Printf("info: difference calculation succeed after %v\n", |
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306 time.Since(begin)) |
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307 |
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308 jr = JSONResult{ |
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309 Result: map[string]int64{"id": id}, |
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310 } |
2570
c4242b9d59fe
Morphological differences: Added endpoint stub POST /api/diff
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
311 return |
c4242b9d59fe
Morphological differences: Added endpoint stub POST /api/diff
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
312 } |