Mercurial > gemma
view pkg/models/intservices.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 | c64dba002726 |
children | 4a816ecf70de |
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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> // * Tom Gottfried <tom.gottfried@intevation.de> package models import ( "context" "database/sql" "log" "net/http" "sync" "gemma.intevation.de/gemma/pkg/auth" "gemma.intevation.de/gemma/pkg/config" ) const DatabaseScheme = "waterway" type ( IntEntry struct { Schema string `json:"schema"` Name string `json:"name"` SQL *string `json:"sql"` KeyColumn *string `json:"keycolumn"` SRS *string `json:"srs"` Style bool `json:"style"` WMS bool `json:"wms"` WFS bool `json:"wfs"` } LayerGroup struct { Name string `json:"name"` Layers []string `json:"layers"` } IntServices struct { mu sync.Mutex entries []IntEntry layerGroups []LayerGroup } ) const ( selectServicesSQL = ` SELECT schema, name, view_def, key_column, auth_name || ':' || auth_srid, style IS NOT NULL, as_wms, as_wfs FROM sys_admin.published_services LEFT JOIN spatial_ref_sys USING (srid) WHERE schema = $1 ORDER by name` selectGroupedLayersSQL = ` SELECT group_name, name FROM sys_admin.grouped_layers ORDER BY group_name, ord` selectStyleSQL = ` SELECT style FROM sys_admin.published_services WHERE name = $1 AND schema = $2` updateStyleSQL = ` UPDATE sys_admin.published_services SET style = $1 WHERE name = $2 AND schema = $3` ) var InternalServices = &IntServices{} func (e *IntEntry) LoadStyle() ([]byte, error) { var style []byte ctx := context.Background() err := auth.RunAs(ctx, "sys_admin", func(conn *sql.Conn) error { return conn.QueryRowContext( ctx, selectStyleSQL, e.Name, e.Schema).Scan(&style) }) return style, err } func UpdateInternalStyle(req *http.Request, name string, style []byte) error { return auth.RunAsSessionUser(req, func(conn *sql.Conn) error { _, err := conn.ExecContext( req.Context(), updateStyleSQL, style, name, DatabaseScheme) if err == nil { InternalServices.Invalidate() } return err }) } func (ps *IntServices) LayerGroups() []LayerGroup { ps.mu.Lock() defer ps.mu.Unlock() if ps.entries == nil { if err := ps.load(); err != nil { log.Printf("error: %v\n", err) return nil } } // To avoid races we simple make a deep copy. // As we don't have such many of them it light weight enough for now. groups := make([]LayerGroup, len(ps.layerGroups)) for i := range groups { layers := make([]string, len(ps.layerGroups[i].Layers)) copy(layers, ps.layerGroups[i].Layers) groups[i] = LayerGroup{Name: ps.layerGroups[i].Name, Layers: layers} } return groups } func (ps *IntServices) Find(name string) (string, bool) { ps.mu.Lock() defer ps.mu.Unlock() if ps.entries == nil { if err := ps.load(); err != nil { log.Printf("error: %v\n", err) return "", false } } if ps.has(name) { return config.GeoServerURL() + "/" + name, true } return "", false } func (ps *IntServices) has(service string) bool { var check func(*IntEntry) bool switch service { case "wms": check = func(e *IntEntry) bool { return e.WMS } case "wfs": check = func(e *IntEntry) bool { return e.WFS } default: return false } for i := range ps.entries { if check(&ps.entries[i]) { return true } } return false } func (ps *IntServices) load() error { // make empty slice to prevent retry if slice is empty. ps.entries = []IntEntry{} ps.layerGroups = []LayerGroup{} ctx := context.Background() // Load the internal layers. entries := func(conn *sql.Conn) error { rows, err := conn.QueryContext( ctx, selectServicesSQL, DatabaseScheme) if err != nil { return err } defer rows.Close() for rows.Next() { var entry IntEntry if err := rows.Scan( &entry.Schema, &entry.Name, &entry.SQL, &entry.KeyColumn, &entry.SRS, &entry.Style, &entry.WMS, &entry.WFS, ); err != nil { return err } ps.entries = append(ps.entries, entry) } return rows.Err() } // Load the layer groups. groups := func(conn *sql.Conn) error { rows, err := conn.QueryContext(ctx, selectGroupedLayersSQL) if err != nil { return err } defer rows.Close() for rows.Next() { var group, layer string if err := rows.Scan(&group, &layer); err != nil { return err } if n := len(ps.layerGroups); n > 0 && ps.layerGroups[n-1].Name == group { ps.layerGroups[n-1].Layers = append(ps.layerGroups[n-1].Layers, layer) } else { ps.layerGroups = append(ps.layerGroups, LayerGroup{ Name: group, Layers: []string{layer}, }) } } return rows.Err() } return auth.RunAllAs(ctx, "sys_admin", entries, groups) } func (ps *IntServices) Invalidate() { ps.mu.Lock() ps.entries = nil ps.layerGroups = nil ps.mu.Unlock() } func InternalAll(IntEntry) bool { return true } func IntWMS(entry IntEntry) bool { return entry.WMS } func IntWFS(entry IntEntry) bool { return entry.WFS } func IntSQLView(entry IntEntry) bool { return entry.SQL != nil } func IntWithStyle(entry IntEntry) bool { return entry.Style } func IntByName(name string) func(IntEntry) bool { return func(entry IntEntry) bool { return entry.Name == name } } func IntAnd(accept ...func(IntEntry) bool) func(IntEntry) bool { return func(entry IntEntry) bool { for _, a := range accept { if !a(entry) { return false } } return true } } func (ps *IntServices) Filter(accept func(IntEntry) bool) []IntEntry { ps.mu.Lock() defer ps.mu.Unlock() if ps.entries == nil { if err := ps.load(); err != nil { log.Printf("error: %v\n", err) return nil } } pe := make([]IntEntry, 0, len(ps.entries)) for _, e := range ps.entries { if accept(e) { pe = append(pe, e) } } return pe }