Mercurial > gemma
view pkg/middleware/dbconn.go @ 5520:05db984d3db1
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> |
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date | Thu, 21 Oct 2021 19:50:39 +0200 |
parents | 5f47eeea988d |
children |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2019 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package middleware import ( "context" "database/sql" "fmt" "net/http" "gemma.intevation.de/gemma/pkg/auth" "gemma.intevation.de/gemma/pkg/log" ) type wrapDBKeyType int const wrapDBKey wrapDBKeyType = 0 // GetDBConn fetches a *sql.Conn from the context of the request. // Returns nil if no such connection exists. func GetDBConn(req *http.Request) *sql.Conn { if conn, ok := req.Context().Value(wrapDBKey).(*sql.Conn); ok { return conn } return nil } // DBConn is a middleware that stores a *sql.Conn in the context // of the incoming request if the user is authorized and // has a valid session. // The handler will return with an http.StatusUnauthorized else // w/o calling the cascaded next handler. func DBConn(next http.Handler) http.Handler { return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { token, ok := auth.GetToken(req) if !ok { http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized) return } session := auth.Sessions.Session(token) if session == nil { http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized) return } parent := req.Context() if err := auth.RunAs(parent, session.User, func(conn *sql.Conn) error { ctx := context.WithValue(parent, wrapDBKey, conn) req = req.WithContext(ctx) next.ServeHTTP(rw, req) return nil }); err != nil { log.Errorf("%v\n", err) http.Error(rw, fmt.Sprintf("error: %v", err), http.StatusInternalServerError) } }) }