Mercurial > gemma
view pkg/models/extservices.go @ 4969:5621586e7a54 fairway-marks-import
Avoid checking the same condition twice
An entry should either be UPDATEd or INSERTed, if it's not already
in the database. Thus simply INSERT if there was no UPDATE.
author | Tom Gottfried <tom@intevation.de> |
---|---|
date | Fri, 28 Feb 2020 17:55:55 +0100 |
parents | cabf4789e02b |
children | 5f47eeea988d |
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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) 2018 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package models import ( "context" "database/sql" "log" "sort" "sync" "gemma.intevation.de/gemma/pkg/auth" ) type ExtEntry struct { Name string `json:"name"` URL string `json:"url"` WFS bool `json:"wfs"` } type ExtServices struct { mu sync.Mutex entries []ExtEntry } var ExternalServices = &ExtServices{} const selectExternalServices = `SELECT local_name, remote_url, is_wfs FROM sys_admin.external_services ORDER BY local_name` func (es *ExtServices) Find(name string) (string, bool) { es.mu.Lock() defer es.mu.Unlock() if es.entries == nil { if err := es.load(); err != nil { log.Printf("error: %v\n", err) return "", false } } n := sort.Search(len(es.entries), func(i int) bool { return es.entries[i].Name >= name }) if n == len(es.entries) || es.entries[n].Name != name { return "", false } return es.entries[n].URL, true } func (es *ExtServices) load() error { // make empty slice to prevent retry if slice is empty. es.entries = []ExtEntry{} return auth.RunAs(context.Background(), "sys_admin", func(conn *sql.Conn) error { rows, err := conn.QueryContext( context.Background(), selectExternalServices) if err != nil { return err } defer rows.Close() for rows.Next() { var entry ExtEntry if err := rows.Scan( &entry.Name, &entry.URL, &entry.WFS, ); err != nil { return err } es.entries = append(es.entries, entry) } return rows.Err() }) } func (es *ExtServices) Invalidate() { es.mu.Lock() es.entries = nil es.mu.Unlock() } func ExternalAll(ExtEntry) bool { return true } func ExternalWMS(entry ExtEntry) bool { return !entry.WFS } func ExternalWFS(entry ExtEntry) bool { return entry.WFS } func (es *ExtServices) Filter(accept func(ExtEntry) bool) []ExtEntry { es.mu.Lock() defer es.mu.Unlock() if es.entries == nil { if err := es.load(); err != nil { log.Printf("error: %v\n", err) return nil } } ee := make([]ExtEntry, 0, len(es.entries)) for _, e := range es.entries { if accept(e) { ee = append(ee, e) } } return ee }