src/main/kotlin/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.kt

   1 /*
   2  * Sone - IdentityManagerImpl.java - Copyright © 2010–2019 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.logging.*
  24 import java.util.logging.Logger.*
  25
  26 /**
  27  * The identity manager takes care of loading and storing identities, their
  28  * contexts, and properties. It does so in a way that does not expose errors via
  29  * exceptions but it only logs them and tries to return sensible defaults.
  30  *
  31  *
  32  * It is also responsible for polling identities from the Web of Trust plugin
  33  * and sending events to the [EventBus] when [Identity]s and
  34  * [OwnIdentity]s are discovered or disappearing.
  35  */
  36 @Singleton
  37 class IdentityManagerImpl @Inject constructor(
  38                 private val eventBus: EventBus,
  39                 private val webOfTrustConnector: WebOfTrustConnector,
  40                 private val identityLoader: IdentityLoader
  41 ) : AbstractService("Sone Identity Manager", false), IdentityManager {
  42
  43         private val currentOwnIdentities = mutableSetOf<OwnIdentity>()
  44
  45         override val isConnected: Boolean
  46                 get() = notThrowing { webOfTrustConnector.ping() }
  47
  48         override val allOwnIdentities: Set<OwnIdentity>
  49                 get() = synchronized(currentOwnIdentities) {
  50                         currentOwnIdentities.toSet()
  51                 }
  52
  53         override fun serviceRun() {
  54                 var oldIdentities = mapOf<OwnIdentity, Collection<Identity>>()
  55
  56                 while (!shouldStop()) {
  57                         try {
  58                                 val currentIdentities = identityLoader.loadIdentities()
  59
  60                                 val identityChangeEventSender = IdentityChangeEventSender(eventBus, oldIdentities)
  61                                 identityChangeEventSender.detectChanges(currentIdentities)
  62
  63                                 oldIdentities = currentIdentities
  64
  65                                 synchronized(currentOwnIdentities) {
  66                                         currentOwnIdentities.clear()
  67                                         currentOwnIdentities.addAll(currentIdentities.keys)
  68                                 }
  69                         } catch (wote1: WebOfTrustException) {
  70                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1)
  71                         }
  72
  73                         /* wait a minute before checking again. */
  74                         sleep((60 * 1000).toLong())
  75                 }
  76         }
  77
  78 }
  79
  80 private val logger: Logger = getLogger(IdentityManagerImpl::class.java.name)
  81
  82 private fun notThrowing(action: () -> Unit): Boolean =
  83                 try {
  84                         action()
  85                         true
  86                 } catch (e: Exception) {
  87                         false
  88                 }