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annotate pkg/controllers/diff.go @ 2570:c4242b9d59fe

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Morphological differences: Added endpoint stub POST /api/diff
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 11 Mar 2019 13:15:28 +0100
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children 7686c7c23506
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2570
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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 "time"
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22
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23 "golang.org/x/sync/semaphore"
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24
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25 "gemma.intevation.de/gemma/pkg/common"
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26 "gemma.intevation.de/gemma/pkg/models"
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27 "gemma.intevation.de/gemma/pkg/octree"
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28 )
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29
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30 // Only allow three diffence calculation at once.
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31 // TODO: Make this configurable?
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32 var diffCalculationSemaphore = semaphore.NewWeighted(int64(3))
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33
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34 func diffCalculation(
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35 input interface{},
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36 req *http.Request,
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37 conn *sql.Conn,
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38 ) (jr JSONResult, err error) {
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39
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40 start := time.Now()
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41
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42 ctx := req.Context()
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43
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44 // DoS counter measure.
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45 if err = diffCalculationSemaphore.Acquire(ctx, 1); err != nil {
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46 return
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47 }
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48 defer diffCalculationSemaphore.Release(1)
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49
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50 dci := input.(models.DiffCalculationInput)
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51
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52 minuendTree, err := octree.FromCache(
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53 ctx, conn,
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54 dci.Bottleneck, dci.Minuend.Time)
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55
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56 log.Printf("info: loading minuend octree took %s\n", time.Since(start))
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57 if err != nil {
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58 return
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59 }
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60
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61 if minuendTree == nil {
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62 err = JSONError{
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63 Code: http.StatusNotFound,
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64 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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65 dci.Bottleneck,
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66 dci.Minuend.Format(common.DateFormat)),
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67 }
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68 return
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69 }
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70
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71 start = time.Now()
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72
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73 subtrahendTree, err := octree.FromCache(
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74 ctx, conn,
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75 dci.Bottleneck, dci.Subtrahend.Time)
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76
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77 log.Printf("info: loading subtrahend octree took %s\n", time.Since(start))
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78 if err != nil {
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79 return
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80 }
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81
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82 if subtrahendTree == nil {
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83 err = JSONError{
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84 Code: http.StatusNotFound,
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85 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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86 dci.Bottleneck,
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87 dci.Subtrahend.Format(common.DateFormat)),
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88 }
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89 return
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90 }
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91
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92 // TODO: Implement me!
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93
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94 return
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95 }