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annotate pkg/middleware/notfound.go @ 5520:05db984d3db1

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Improve performance of bottleneck area calculation Avoid buffer calculations by replacing them with simple distance comparisons and calculate the boundary of the result geometry only once per iteration. In some edge cases with very large numbers of iterations, this reduced the runtime of a bottleneck import by a factor of more than twenty.
author Tom Gottfried <tom@intevation.de>
date Thu, 21 Oct 2021 19:50:39 +0200
parents 6f9d00c8cc38
children
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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 middleware
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15
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16 import (
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17 "errors"
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18 "net/http"
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19 )
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20
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21 // ErrNotFound should be as the argument to panic if the NotFound should
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22 // report back a http.StatusNotFound.
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23 var ErrNotFound = errors.New("not found")
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24
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25 // NotFound creates an http.Handler which survives panic(ErrNotFound) and
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26 // reports http.StatusNotFound in these cases back to the calling handler.
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27 func NotFound(next http.Handler) http.Handler {
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28 return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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29 defer func() {
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30 if p := recover(); p != nil {
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31 if p == ErrNotFound {
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32 http.NotFound(rw, req)
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33 } else {
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34 panic(p)
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35 }
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36 }
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37 }()
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38 next.ServeHTTP(rw, req)
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39 })
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40 }