🚧 Add session provider implementation
[Sone.git] / src / main / kotlin / net / pterodactylus / sone / freenet / wot / IdentityManagerImpl.kt
1 /*
2  * Sone - IdentityManagerImpl.kt - Copyright Â© 2010–2020 David Roden
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 package net.pterodactylus.sone.freenet.wot
19
20 import com.google.common.eventbus.*
21 import com.google.inject.*
22 import net.pterodactylus.util.service.*
23 import java.util.concurrent.TimeUnit.*
24 import java.util.logging.*
25 import java.util.logging.Logger.*
26
27 /**
28  * The identity manager takes care of loading and storing identities, their
29  * contexts, and properties. It does so in a way that does not expose errors via
30  * exceptions but it only logs them and tries to return sensible defaults.
31  *
32  *
33  * It is also responsible for polling identities from the Web of Trust plugin
34  * and sending events to the [EventBus] when [Identity]s and
35  * [OwnIdentity]s are discovered or disappearing.
36  */
37 @Singleton
38 class IdentityManagerImpl @Inject constructor(
39                 private val eventBus: EventBus,
40                 private val webOfTrustConnector: WebOfTrustConnector,
41                 private val identityLoader: IdentityLoader
42 ) : AbstractService("Sone Identity Manager", false), IdentityManager {
43
44         private val currentOwnIdentities = mutableSetOf<OwnIdentity>()
45
46         override val isConnected: Boolean
47                 get() = notThrowing { webOfTrustConnector.ping() }
48
49         override val allOwnIdentities: Set<OwnIdentity>
50                 get() = synchronized(currentOwnIdentities) {
51                         currentOwnIdentities.toSet()
52                 }
53
54         override fun serviceRun() {
55                 var oldIdentities = mapOf<OwnIdentity, Collection<Identity>>()
56
57                 while (!shouldStop()) {
58                         try {
59                                 val currentIdentities = identityLoader.loadIdentities()
60
61                                 val identityChangeEventSender = IdentityChangeEventSender(eventBus, oldIdentities)
62                                 identityChangeEventSender.detectChanges(currentIdentities)
63
64                                 oldIdentities = currentIdentities
65
66                                 synchronized(currentOwnIdentities) {
67                                         currentOwnIdentities.clear()
68                                         currentOwnIdentities.addAll(currentIdentities.keys)
69                                 }
70                         } catch (wote1: WebOfTrustException) {
71                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1)
72                         } catch (e: Exception) {
73                                 logger.log(Level.SEVERE, "Uncaught exception in IdentityManager thread!", e)
74                         }
75
76                         /* wait a minute before checking again. */
77                         sleep(SECONDS.toMillis(60))
78                 }
79         }
80
81 }
82
83 private val logger: Logger = getLogger(IdentityManagerImpl::class.java.name)
84
85 private fun notThrowing(action: () -> Unit): Boolean =
86                 try {
87                         action()
88                         true
89                 } catch (e: Exception) {
90                         false
91                 }