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

   1 /*
   2  * Sone - IdentityManagerImpl.kt - Copyright © 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.EventBus
  21 import com.google.common.eventbus.Subscribe
  22 import com.google.inject.Inject
  23 import com.google.inject.Singleton
  24 import net.pterodactylus.sone.core.event.StrictFilteringActivatedEvent
  25 import net.pterodactylus.sone.core.event.StrictFilteringDeactivatedEvent
  26 import net.pterodactylus.util.service.AbstractService
  27 import java.util.concurrent.TimeUnit.SECONDS
  28 import java.util.concurrent.atomic.AtomicBoolean
  29 import java.util.logging.Level
  30 import java.util.logging.Logger
  31 import java.util.logging.Logger.getLogger
  32
  33 /**
  34  * The identity manager takes care of loading and storing identities, their
  35  * contexts, and properties. It does so in a way that does not expose errors via
  36  * exceptions but it only logs them and tries to return sensible defaults.
  37  *
  38  *
  39  * It is also responsible for polling identities from the Web of Trust plugin
  40  * and sending events to the [EventBus] when [Identity]s and
  41  * [OwnIdentity]s are discovered or disappearing.
  42  */
  43 @Singleton
  44 class IdentityManagerImpl @Inject constructor(
  45                 private val eventBus: EventBus,
  46                 private val webOfTrustConnector: WebOfTrustConnector,
  47                 private val identityLoader: IdentityLoader
  48 ) : AbstractService("Sone Identity Manager", false), IdentityManager {
  49
  50         private val currentOwnIdentities = mutableSetOf<OwnIdentity>()
  51         private val strictFiltering = AtomicBoolean(false)
  52         private val noNegativeIdentityFilter = NoNegativeIdentityFilter()
  53
  54         override val isConnected: Boolean
  55                 get() = notThrowing { webOfTrustConnector.ping() }
  56
  57         override val allOwnIdentities: Set<OwnIdentity>
  58                 get() = synchronized(currentOwnIdentities) {
  59                         currentOwnIdentities.toSet()
  60                 }
  61
  62         override fun serviceRun() {
  63                 var oldIdentities = mapOf<OwnIdentity, Collection<Identity>>()
  64
  65                 while (!shouldStop()) {
  66                         try {
  67                                 val currentIdentities = identityLoader.loadAllIdentities().applyStrictFiltering()
  68
  69                                 val identityChangeEventSender = IdentityChangeEventSender(eventBus, oldIdentities)
  70                                 identityChangeEventSender.detectChanges(currentIdentities)
  71
  72                                 oldIdentities = currentIdentities
  73
  74                                 synchronized(currentOwnIdentities) {
  75                                         currentOwnIdentities.clear()
  76                                         currentOwnIdentities.addAll(currentIdentities.keys)
  77                                 }
  78                         } catch (wote1: WebOfTrustException) {
  79                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1)
  80                         } catch (e: Exception) {
  81                                 logger.log(Level.SEVERE, "Uncaught exception in IdentityManager thread!", e)
  82                         }
  83
  84                         /* wait a minute before checking again. */
  85                         sleep(SECONDS.toMillis(60))
  86                 }
  87         }
  88
  89         private fun Map<OwnIdentity, Set<Identity>>.applyStrictFiltering() =
  90                         if (strictFiltering.get()) {
  91                                 noNegativeIdentityFilter.filter(this)
  92                         } else {
  93                                 this
  94                         }
  95
  96         @Subscribe
  97         fun strictFilteringActivated(event: StrictFilteringActivatedEvent) {
  98                 strictFiltering.set(true)
  99         }
 100
 101         @Subscribe
 102         fun strictFilteringDeactivated(event: StrictFilteringDeactivatedEvent) {
 103                 strictFiltering.set(false)
 104         }
 105
 106 }
 107
 108 private val logger: Logger = getLogger(IdentityManagerImpl::class.java.name)
 109
 110 private fun notThrowing(action: () -> Unit): Boolean =
 111                 try {
 112                         action()
 113                         true
 114                 } catch (e: Exception) {
 115                         false
 116                 }