Mercurial > gemma

annotate pkg/models/extservices.go @ 5710:37c8feeecb4d

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Merged branch sr-v2 into default.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 20 Feb 2024 21:28:56 +0100
parents 1222b777f51f
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 models
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15
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16 import (
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17 "context"
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18 "database/sql"
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19 "sort"
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20 "sync"
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21
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22 "gemma.intevation.de/gemma/pkg/auth"
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23 "gemma.intevation.de/gemma/pkg/log"
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24 )
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25
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26 // ExtEntry is an external WFS service.
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27 type ExtEntry struct {
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28 Name string `json:"name"`
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29 URL string `json:"url"`
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30 WFS bool `json:"wfs"`
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31 }
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32
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33 // ExtServices is a list of the external services.
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34 type ExtServices struct {
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35 mu sync.Mutex
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36 entries []ExtEntry
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37 }
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38
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39 // ExternalServices is the list of external services
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40 // the Gemma server manages as proxies.
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41 var ExternalServices = &ExtServices{}
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42
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43 const selectExternalServices = `SELECT local_name, remote_url, is_wfs
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44 FROM sys_admin.external_services ORDER BY local_name`
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45
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46 // Find looks for a specific configures external service.
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47 func (es *ExtServices) Find(name string) (string, bool) {
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48 es.mu.Lock()
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49 defer es.mu.Unlock()
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50
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51 if es.entries == nil {
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52 if err := es.load(); err != nil {
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53 log.Errorf("%v\n", err)
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54 return "", false
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55 }
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56 }
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57 n := sort.Search(len(es.entries), func(i int) bool {
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58 return es.entries[i].Name >= name
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59 })
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60 if n == len(es.entries) || es.entries[n].Name != name {
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61 return "", false
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62 }
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63 return es.entries[n].URL, true
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64 }
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65
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66 func (es *ExtServices) load() error {
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67 // make empty slice to prevent retry if slice is empty.
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68 es.entries = []ExtEntry{}
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69 return auth.RunAs(context.Background(), "sys_admin",
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70 func(conn *sql.Conn) error {
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71 rows, err := conn.QueryContext(
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72 context.Background(), selectExternalServices)
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73 if err != nil {
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74 return err
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75 }
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76 defer rows.Close()
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77 for rows.Next() {
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78 var entry ExtEntry
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79 if err := rows.Scan(
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80 &entry.Name,
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81 &entry.URL,
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82 &entry.WFS,
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83 ); err != nil {
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84 return err
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85 }
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86 es.entries = append(es.entries, entry)
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87 }
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88 return rows.Err()
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89 })
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90 }
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91
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92 // Invalidate invalidate the list of external services.
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93 func (es *ExtServices) Invalidate() {
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94 es.mu.Lock()
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95 es.entries = nil
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96 es.mu.Unlock()
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97 }
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98
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99 // ExternalAll passes all external entries as filter.
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100 func ExternalAll(ExtEntry) bool { return true }
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101
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102 // ExternalWMS passes only external entries which are not WFSs.
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103 func ExternalWMS(entry ExtEntry) bool { return !entry.WFS }
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104
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105 // ExternalWFS passes only external enteries which are WFS.
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106 func ExternalWFS(entry ExtEntry) bool { return entry.WFS }
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107
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108 // Filter returns a list of external services which met
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109 // the condition of the given accept filter.
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110 func (es *ExtServices) Filter(accept func(ExtEntry) bool) []ExtEntry {
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111 es.mu.Lock()
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112 defer es.mu.Unlock()
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113 if es.entries == nil {
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114 if err := es.load(); err != nil {
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115 log.Errorf("%v\n", err)
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116 return nil
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117 }
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118 }
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119 ee := make([]ExtEntry, 0, len(es.entries))
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120 for _, e := range es.entries {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 442
diff changeset
121 if accept(e) {
659c04feb2dc Made use of sorted slice in external proxied services symmetric to published services.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 442
diff changeset
122 ee = append(ee, e)
659c04feb2dc Made use of sorted slice in external proxied services symmetric to published services.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 442
diff changeset
123 }
659c04feb2dc Made use of sorted slice in external proxied services symmetric to published services.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 442
diff changeset
124 }
659c04feb2dc Made use of sorted slice in external proxied services symmetric to published services.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 442
diff changeset
125 return ee
659c04feb2dc Made use of sorted slice in external proxied services symmetric to published services.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 442
diff changeset
126 }