Merge pull request #1156 from eikek/notifications

Notifications

build.sbt

@@ -410,6 +410,36 @@ val store = project
   )
   .dependsOn(common, query.jvm, totp, files)
 
+val pubsubApi = project
+  .in(file("modules/pubsub/api"))
+  .disablePlugins(RevolverPlugin)
+  .settings(sharedSettings)
+  .settings(testSettingsMUnit)
+  .settings(
+    name := "docspell-pubsub-api",
+    addCompilerPlugin(Dependencies.kindProjectorPlugin),
+    libraryDependencies ++=
+      Dependencies.fs2
+  )
+  .dependsOn(common)
+
+val pubsubNaive = project
+  .in(file("modules/pubsub/naive"))
+  .disablePlugins(RevolverPlugin)
+  .settings(sharedSettings)
+  .settings(testSettingsMUnit)
+  .settings(
+    name := "docspell-pubsub-naive",
+    addCompilerPlugin(Dependencies.kindProjectorPlugin),
+    libraryDependencies ++=
+      Dependencies.fs2 ++
+        Dependencies.http4sCirce ++
+        Dependencies.http4sDsl ++
+        Dependencies.http4sClient ++
+        Dependencies.circe
+  )
+  .dependsOn(common, pubsubApi, store % "compile->compile;test->test")
+
 val extract = project
   .in(file("modules/extract"))
   .disablePlugins(RevolverPlugin)
@@ -534,7 +564,7 @@ val backend = project
         Dependencies.http4sClient ++
         Dependencies.emil
   )
-  .dependsOn(store, joexapi, ftsclient, totp)
+  .dependsOn(store, joexapi, ftsclient, totp, pubsubApi)
 
 val oidc = project
   .in(file("modules/oidc"))
@@ -625,7 +655,8 @@ val joex = project
     analysis,
     joexapi,
     restapi,
-    ftssolr
+    ftssolr,
+    pubsubNaive
   )
 
 val restserver = project
@@ -689,7 +720,7 @@ val restserver = project
       }
     }
   )
-  .dependsOn(config, restapi, joexapi, backend, webapp, ftssolr, oidc)
+  .dependsOn(config, restapi, joexapi, backend, webapp, ftssolr, oidc, pubsubNaive)
 
 // --- Website Documentation
 
@@ -781,7 +812,9 @@ val root = project
     query.jvm,
     query.js,
     totp,
-    oidc
+    oidc,
+    pubsubApi,
+    pubsubNaive
   )
 
 // --- Helpers

modules/backend/src/main/scala/docspell/backend/BackendApp.scala

@@ -6,8 +6,6 @@
 
 package docspell.backend
 
-import scala.concurrent.ExecutionContext
-
 import cats.effect._
 
 import docspell.backend.auth.Login
@@ -15,15 +13,13 @@ import docspell.backend.fulltext.CreateIndex
 import docspell.backend.ops._
 import docspell.backend.signup.OSignup
 import docspell.ftsclient.FtsClient
-import docspell.joexapi.client.JoexClient
+import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.queue.JobQueue
 import docspell.store.usertask.UserTaskStore
 import docspell.totp.Totp
 
 import emil.javamail.{JavaMailEmil, Settings}
-import org.http4s.blaze.client.BlazeClientBuilder
-import org.http4s.client.Client
 
 trait BackendApp[F[_]] {
 
@@ -49,6 +45,7 @@ trait BackendApp[F[_]] {
   def clientSettings: OClientSettings[F]
   def totp: OTotp[F]
   def share: OShare[F]
+  def pubSub: PubSubT[F]
 }
 
 object BackendApp {
@@ -56,8 +53,8 @@ object BackendApp {
   def create[F[_]: Async](
       cfg: Config,
       store: Store[F],
-      httpClient: Client[F],
-      ftsClient: FtsClient[F]
+      ftsClient: FtsClient[F],
+      pubSubT: PubSubT[F]
   ): Resource[F, BackendApp[F]] =
     for {
       utStore <- UserTaskStore(store)
@@ -65,7 +62,7 @@ object BackendApp {
       totpImpl <- OTotp(store, Totp.default)
       loginImpl <- Login[F](store, Totp.default)
       signupImpl <- OSignup[F](store)
-      joexImpl <- OJoex(JoexClient(httpClient), store)
+      joexImpl <- OJoex(pubSubT)
       collImpl <- OCollective[F](store, utStore, queue, joexImpl)
       sourceImpl <- OSource[F](store)
       tagImpl <- OTag[F](store)
@@ -90,6 +87,7 @@ object BackendApp {
         OShare(store, itemSearchImpl, simpleSearchImpl, javaEmil)
       )
     } yield new BackendApp[F] {
+      val pubSub = pubSubT
       val login = loginImpl
       val signup = signupImpl
       val collective = collImpl
@@ -113,15 +111,4 @@ object BackendApp {
       val totp = totpImpl
       val share = shareImpl
     }
-
-  def apply[F[_]: Async](
-      cfg: Config,
-      connectEC: ExecutionContext
-  )(ftsFactory: Client[F] => Resource[F, FtsClient[F]]): Resource[F, BackendApp[F]] =
-    for {
-      store <- Store.create(cfg.jdbc, cfg.files.chunkSize, connectEC)
-      httpClient <- BlazeClientBuilder[F].resource
-      ftsClient <- ftsFactory(httpClient)
-      backend <- create(cfg, store, httpClient, ftsClient)
-    } yield backend
 }

modules/backend/src/main/scala/docspell/backend/msg/CancelJob.scala

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.backend.msg
+
+import docspell.common._
+import docspell.pubsub.api.{Topic, TypedTopic}
+
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+import io.circe.{Decoder, Encoder}
+
+/** Message to request to cancel a job. */
+final case class CancelJob(jobId: Ident, nodeId: Ident)
+
+object CancelJob {
+  implicit val jsonDecoder: Decoder[CancelJob] =
+    deriveDecoder[CancelJob]
+
+  implicit val jsonEncoder: Encoder[CancelJob] =
+    deriveEncoder[CancelJob]
+
+  val topic: TypedTopic[CancelJob] =
+    TypedTopic(Topic("job-cancel-request"))
+}

modules/backend/src/main/scala/docspell/backend/msg/JobDone.scala

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.backend.msg
+
+import docspell.common._
+import docspell.pubsub.api.{Topic, TypedTopic}
+
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+import io.circe.{Decoder, Encoder}
+
+/** Message to notify about finished jobs. They have a final state. */
+final case class JobDone(jobId: Ident, task: Ident, args: String, state: JobState)
+object JobDone {
+  implicit val jsonDecoder: Decoder[JobDone] =
+    deriveDecoder[JobDone]
+
+  implicit val jsonEncoder: Encoder[JobDone] =
+    deriveEncoder[JobDone]
+
+  val topic: TypedTopic[JobDone] =
+    TypedTopic(Topic("job-finished"))
+}

modules/backend/src/main/scala/docspell/backend/msg/Topics.scala

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.backend.msg
+
+import cats.data.NonEmptyList
+
+import docspell.pubsub.api.{Topic, TypedTopic}
+
+/** All topics used in Docspell. */
+object Topics {
+
+  /** A generic notification to the job executors to look for new work. */
+  val jobsNotify: TypedTopic[Unit] =
+    TypedTopic[Unit](Topic("jobs-notify"))
+
+  /** A list of all topics. It is required to list every topic in use here! */
+  val all: NonEmptyList[TypedTopic[_]] =
+    NonEmptyList.of(JobDone.topic, CancelJob.topic, jobsNotify)
+}

modules/backend/src/main/scala/docspell/backend/ops/OJob.scala

@@ -11,8 +11,7 @@ import cats.effect._
 import cats.implicits._
 
 import docspell.backend.ops.OJob.{CollectiveQueueState, JobCancelResult}
-import docspell.common.Priority
-import docspell.common.{Ident, JobState}
+import docspell.common._
 import docspell.store.Store
 import docspell.store.UpdateResult
 import docspell.store.queries.QJob
@@ -55,6 +54,7 @@ object OJob {
       joex: OJoex[F]
   ): Resource[F, OJob[F]] =
     Resource.pure[F, OJob[F]](new OJob[F] {
+      private[this] val logger = Logger.log4s(org.log4s.getLogger(OJob.getClass))
 
       def queueState(collective: Ident, maxResults: Int): F[CollectiveQueueState] =
         store
@@ -77,11 +77,9 @@ object OJob {
           job.worker match {
             case Some(worker) =>
               for {
-                flag <- joex.cancelJob(job.id, worker)
-                res <-
-                  if (flag) JobCancelResult.cancelRequested.pure[F]
-                  else remove(job)
-              } yield res
+                _ <- logger.debug(s"Attempt to cancel job: ${job.id.id}")
+                _ <- joex.cancelJob(job.id, worker)
+              } yield JobCancelResult.cancelRequested
             case None =>
               remove(job)
           }

modules/backend/src/main/scala/docspell/backend/ops/OJoex.scala

@@ -6,41 +6,27 @@
 
 package docspell.backend.ops
 
-import cats.data.OptionT
 import cats.effect._
-import cats.implicits._
 
-import docspell.common.{Ident, NodeType}
-import docspell.joexapi.client.JoexClient
-import docspell.store.Store
-import docspell.store.records.RNode
+import docspell.backend.msg.{CancelJob, Topics}
+import docspell.common.Ident
+import docspell.pubsub.api.PubSubT
 
 trait OJoex[F[_]] {
 
   def notifyAllNodes: F[Unit]
 
-  def cancelJob(job: Ident, worker: Ident): F[Boolean]
-
+  def cancelJob(job: Ident, worker: Ident): F[Unit]
 }
 
 object OJoex {
-
-  def apply[F[_]: Sync](client: JoexClient[F], store: Store[F]): Resource[F, OJoex[F]] =
+  def apply[F[_]](pubSub: PubSubT[F]): Resource[F, OJoex[F]] =
     Resource.pure[F, OJoex[F]](new OJoex[F] {
+
       def notifyAllNodes: F[Unit] =
-        for {
-          nodes <- store.transact(RNode.findAll(NodeType.Joex))
-          _ <- nodes.toList.traverse(n => client.notifyJoexIgnoreErrors(n.url))
-        } yield ()
+        pubSub.publish1IgnoreErrors(Topics.jobsNotify, ())
 
-      def cancelJob(job: Ident, worker: Ident): F[Boolean] =
-        (for {
-          node <- OptionT(store.transact(RNode.findById(worker)))
-          cancel <- OptionT.liftF(client.cancelJob(node.url, job))
-        } yield cancel.success).getOrElse(false)
+      def cancelJob(job: Ident, worker: Ident): F[Unit] =
+        pubSub.publish1IgnoreErrors(CancelJob.topic, CancelJob(job, worker))
     })
-
-  def create[F[_]: Async](store: Store[F]): Resource[F, OJoex[F]] =
-    JoexClient.resource.flatMap(client => apply(client, store))
-
 }

modules/common/src/main/scala/docspell/common/Logger.scala

@@ -6,6 +6,7 @@
 
 package docspell.common
 
+import cats.Applicative
 import cats.effect.Sync
 import fs2.Stream
 
@@ -45,6 +46,27 @@ trait Logger[F[_]] { self =>
 
 object Logger {
 
+  def off[F[_]: Applicative]: Logger[F] =
+    new Logger[F] {
+      def trace(msg: => String): F[Unit] =
+        Applicative[F].pure(())
+
+      def debug(msg: => String): F[Unit] =
+        Applicative[F].pure(())
+
+      def info(msg: => String): F[Unit] =
+        Applicative[F].pure(())
+
+      def warn(msg: => String): F[Unit] =
+        Applicative[F].pure(())
+
+      def error(ex: Throwable)(msg: => String): F[Unit] =
+        Applicative[F].pure(())
+
+      def error(msg: => String): F[Unit] =
+        Applicative[F].pure(())
+    }
+
   def log4s[F[_]: Sync](log: Log4sLogger): Logger[F] =
     new Logger[F] {
       def trace(msg: => String): F[Unit] =

modules/common/src/main/scala/docspell/common/syntax/StringSyntax.scala

@@ -12,9 +12,7 @@ import io.circe.Decoder
 import io.circe.parser._
 
 trait StringSyntax {
-
   implicit class EvenMoreStringOps(s: String) {
-
     def asNonBlank: Option[String] =
       Option(s).filter(_.trim.nonEmpty)
 
@@ -24,5 +22,6 @@ trait StringSyntax {
         value <- json.as[A]
       } yield value
   }
-
 }
+
+object StringSyntax extends StringSyntax

modules/joex/src/main/scala/docspell/joex/Config.scala

@@ -20,6 +20,7 @@ import docspell.joex.analysis.RegexNerFile
 import docspell.joex.hk.HouseKeepingConfig
 import docspell.joex.scheduler.{PeriodicSchedulerConfig, SchedulerConfig}
 import docspell.joex.updatecheck.UpdateCheckConfig
+import docspell.pubsub.naive.PubSubConfig
 import docspell.store.JdbcConfig
 
 case class Config(
@@ -39,7 +40,11 @@ case class Config(
     mailDebug: Boolean,
     fullTextSearch: Config.FullTextSearch,
     updateCheck: UpdateCheckConfig
-)
+) {
+
+  def pubSubConfig: PubSubConfig =
+    PubSubConfig(appId, baseUrl / "internal" / "pubsub", 100)
+}
 
 object Config {
   case class Bind(address: String, port: Int)

modules/joex/src/main/scala/docspell/joex/JoexAppImpl.scala

@@ -6,14 +6,13 @@
 
 package docspell.joex
 
-import scala.concurrent.ExecutionContext
-
 import cats.effect._
 import cats.implicits._
 import fs2.concurrent.SignallingRef
 
 import docspell.analysis.TextAnalyser
 import docspell.backend.fulltext.CreateIndex
+import docspell.backend.msg.{CancelJob, Topics}
 import docspell.backend.ops._
 import docspell.common._
 import docspell.ftsclient.FtsClient
@@ -34,6 +33,7 @@ import docspell.joex.scanmailbox._
 import docspell.joex.scheduler._
 import docspell.joex.updatecheck._
 import docspell.joexapi.client.JoexClient
+import docspell.pubsub.api.{PubSub, PubSubT}
 import docspell.store.Store
 import docspell.store.queue._
 import docspell.store.records.{REmptyTrashSetting, RJobLog}
@@ -41,20 +41,18 @@ import docspell.store.usertask.UserTaskScope
 import docspell.store.usertask.UserTaskStore
 
 import emil.javamail._
-import org.http4s.blaze.client.BlazeClientBuilder
 import org.http4s.client.Client
 
 final class JoexAppImpl[F[_]: Async](
     cfg: Config,
-    nodeOps: ONode[F],
     store: Store[F],
     queue: JobQueue[F],
+    pubSubT: PubSubT[F],
     pstore: PeriodicTaskStore[F],
     termSignal: SignallingRef[F, Boolean],
     val scheduler: Scheduler[F],
     val periodicScheduler: PeriodicScheduler[F]
 ) extends JoexApp[F] {
-
   def init: F[Unit] = {
     val run = scheduler.start.compile.drain
     val prun = periodicScheduler.start.compile.drain
@@ -64,16 +62,23 @@ final class JoexAppImpl[F[_]: Async](
       _ <- Async[F].start(prun)
       _ <- scheduler.periodicAwake
       _ <- periodicScheduler.periodicAwake
-      _ <- nodeOps.register(cfg.appId, NodeType.Joex, cfg.baseUrl)
+      _ <- subscriptions
     } yield ()
   }
 
+  def subscriptions =
+    for {
+      _ <- Async[F].start(pubSubT.subscribeSink(Topics.jobsNotify) { _ =>
+        scheduler.notifyChange
+      })
+      _ <- Async[F].start(pubSubT.subscribeSink(CancelJob.topic) { msg =>
+        scheduler.requestCancel(msg.body.jobId).as(())
+      })
+    } yield ()
+
   def findLogs(jobId: Ident): F[Vector[RJobLog]] =
     store.transact(RJobLog.findLogs(jobId))
 
-  def shutdown: F[Unit] =
-    nodeOps.unregister(cfg.appId)
-
   def initShutdown: F[Unit] =
     periodicScheduler.shutdown *> scheduler.shutdown(false) *> termSignal.set(true)
 
@@ -116,16 +121,19 @@ object JoexAppImpl {
   def create[F[_]: Async](
       cfg: Config,
       termSignal: SignallingRef[F, Boolean],
-      connectEC: ExecutionContext
+      store: Store[F],
+      httpClient: Client[F],
+      pubSub: PubSub[F]
   ): Resource[F, JoexApp[F]] =
     for {
-      httpClient <- BlazeClientBuilder[F].resource
-      client = JoexClient(httpClient)
-      store <- Store.create(cfg.jdbc, cfg.files.chunkSize, connectEC)
       queue <- JobQueue(store)
       pstore <- PeriodicTaskStore.create(store)
-      nodeOps <- ONode(store)
-      joex <- OJoex(client, store)
+      client = JoexClient(httpClient)
+      pubSubT = PubSubT(
+        pubSub,
+        Logger.log4s(org.log4s.getLogger(s"joex-${cfg.appId.id}"))
+      )
+      joex <- OJoex(pubSubT)
       upload <- OUpload(store, queue, joex)
       fts <- createFtsClient(cfg)(httpClient)
       createIndex <- CreateIndex.resource(fts, store)
@@ -138,6 +146,7 @@ object JoexAppImpl {
         JavaMailEmil(Settings.defaultSettings.copy(debug = cfg.mailDebug))
       sch <- SchedulerBuilder(cfg.scheduler, store)
         .withQueue(queue)
+        .withPubSub(pubSubT)
         .withTask(
           JobTask.json(
             ProcessItemArgs.taskName,
@@ -264,8 +273,8 @@ object JoexAppImpl {
         pstore,
         client
       )
-      app = new JoexAppImpl(cfg, nodeOps, store, queue, pstore, termSignal, sch, psch)
-      appR <- Resource.make(app.init.map(_ => app))(_.shutdown)
+      app = new JoexAppImpl(cfg, store, queue, pubSubT, pstore, termSignal, sch, psch)
+      appR <- Resource.make(app.init.map(_ => app))(_.initShutdown)
     } yield appR
 
   private def createFtsClient[F[_]: Async](

modules/joex/src/main/scala/docspell/joex/JoexServer.scala

@@ -11,10 +11,14 @@ import cats.effect._
 import fs2.Stream
 import fs2.concurrent.SignallingRef
 
+import docspell.backend.msg.Topics
 import docspell.common.Pools
 import docspell.joex.routes._
+import docspell.pubsub.naive.NaivePubSub
+import docspell.store.Store
 
 import org.http4s.HttpApp
+import org.http4s.blaze.client.BlazeClientBuilder
 import org.http4s.blaze.server.BlazeServerBuilder
 import org.http4s.implicits._
 import org.http4s.server.Router
@@ -33,9 +37,19 @@ object JoexServer {
     val app = for {
       signal <- Resource.eval(SignallingRef[F, Boolean](false))
       exitCode <- Resource.eval(Ref[F].of(ExitCode.Success))
-      joexApp <- JoexAppImpl.create[F](cfg, signal, pools.connectEC)
+
+      store <- Store.create[F](
+        cfg.jdbc,
+        cfg.files.chunkSize,
+        pools.connectEC
+      )
+      httpClient <- BlazeClientBuilder[F].resource
+      pubSub <- NaivePubSub(cfg.pubSubConfig, store, httpClient)(Topics.all.map(_.topic))
+
+      joexApp <- JoexAppImpl.create[F](cfg, signal, store, httpClient, pubSub)
 
       httpApp = Router(
+        "/internal/pubsub" -> pubSub.receiveRoute,
         "/api/info" -> InfoRoutes(cfg),
         "/api/v1" -> JoexRoutes(joexApp)
       ).orNotFound

modules/joex/src/main/scala/docspell/joex/scheduler/SchedulerBuilder.scala

@@ -11,6 +11,7 @@ import cats.effect.std.Semaphore
 import cats.implicits._
 import fs2.concurrent.SignallingRef
 
+import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.queue.JobQueue
 
@@ -19,7 +20,8 @@ case class SchedulerBuilder[F[_]: Async](
     tasks: JobTaskRegistry[F],
     store: Store[F],
     queue: Resource[F, JobQueue[F]],
-    logSink: LogSink[F]
+    logSink: LogSink[F],
+    pubSub: PubSubT[F]
 ) {
 
   def withConfig(cfg: SchedulerConfig): SchedulerBuilder[F] =
@@ -32,7 +34,7 @@ case class SchedulerBuilder[F[_]: Async](
     withTaskRegistry(tasks.withTask(task))
 
   def withQueue(queue: Resource[F, JobQueue[F]]): SchedulerBuilder[F] =
-    SchedulerBuilder[F](config, tasks, store, queue, logSink)
+    copy(queue = queue)
 
   def withLogSink(sink: LogSink[F]): SchedulerBuilder[F] =
     copy(logSink = sink)
@@ -40,6 +42,9 @@ case class SchedulerBuilder[F[_]: Async](
   def withQueue(queue: JobQueue[F]): SchedulerBuilder[F] =
     copy(queue = Resource.pure[F, JobQueue[F]](queue))
 
+  def withPubSub(pubSubT: PubSubT[F]): SchedulerBuilder[F] =
+    copy(pubSub = pubSubT)
+
   def serve: Resource[F, Scheduler[F]] =
     resource.evalMap(sch => Async[F].start(sch.start.compile.drain).map(_ => sch))
 
@@ -52,6 +57,7 @@ case class SchedulerBuilder[F[_]: Async](
     } yield new SchedulerImpl[F](
       config,
       jq,
+      pubSub,
       tasks,
       store,
       logSink,
@@ -76,7 +82,8 @@ object SchedulerBuilder {
       JobTaskRegistry.empty[F],
       store,
       JobQueue(store),
-      LogSink.db[F](store)
+      LogSink.db[F](store),
+      PubSubT.noop[F]
     )
 
 }

modules/joex/src/main/scala/docspell/joex/scheduler/SchedulerImpl.scala

@@ -13,19 +13,22 @@ import cats.implicits._
 import fs2.Stream
 import fs2.concurrent.SignallingRef
 
+import docspell.backend.msg.JobDone
 import docspell.common._
 import docspell.common.syntax.all._
 import docspell.joex.scheduler.SchedulerImpl._
+import docspell.pubsub.api.PubSubT
 import docspell.store.Store
 import docspell.store.queries.QJob
 import docspell.store.queue.JobQueue
 import docspell.store.records.RJob
 
-import org.log4s._
+import org.log4s.getLogger
 
 final class SchedulerImpl[F[_]: Async](
     val config: SchedulerConfig,
     queue: JobQueue[F],
+    pubSub: PubSubT[F],
     tasks: JobTaskRegistry[F],
     store: Store[F],
     logSink: LogSink[F],
@@ -55,20 +58,21 @@ final class SchedulerImpl[F[_]: Async](
     state.get.flatMap(s => QJob.findAll(s.getRunning, store))
 
   def requestCancel(jobId: Ident): F[Boolean] =
-    state.get.flatMap(_.cancelRequest(jobId) match {
-      case Some(ct) => ct.map(_ => true)
-      case None =>
-        (for {
-          job <- OptionT(store.transact(RJob.findByIdAndWorker(jobId, config.name)))
-          _ <- OptionT.liftF(
-            if (job.isInProgress) executeCancel(job)
-            else ().pure[F]
-          )
-        } yield true)
-          .getOrElseF(
-            logger.fwarn(s"Job ${jobId.id} not found, cannot cancel.").map(_ => false)
-          )
-    })
+    logger.finfo(s"Scheduler requested to cancel job: ${jobId.id}") *>
+      state.get.flatMap(_.cancelRequest(jobId) match {
+        case Some(ct) => ct.map(_ => true)
+        case None =>
+          (for {
+            job <- OptionT(store.transact(RJob.findByIdAndWorker(jobId, config.name)))
+            _ <- OptionT.liftF(
+              if (job.isInProgress) executeCancel(job)
+              else ().pure[F]
+            )
+          } yield true)
+            .getOrElseF(
+              logger.fwarn(s"Job ${jobId.id} not found, cannot cancel.").map(_ => false)
+            )
+      })
 
   def notifyChange: F[Unit] =
     waiter.update(b => !b)
@@ -198,6 +202,10 @@ final class SchedulerImpl[F[_]: Async](
       )
       _ <- state.modify(_.removeRunning(job))
       _ <- QJob.setFinalState(job.id, finalState, store)
+      _ <- pubSub.publish1IgnoreErrors(
+        JobDone.topic,
+        JobDone(job.id, job.task, job.args, finalState)
+      )
     } yield ()
 
   def onStart(job: RJob): F[Unit] =

modules/pubsub/api/src/main/scala/docspell/pubsub/api/Message.scala

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.api
+
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+import io.circe.{Decoder, Encoder, Json}
+
+final case class Message[A](head: MessageHead, body: A) {}
+
+object Message {
+  implicit val jsonDecoderJson: Decoder[Message[Json]] =
+    deriveDecoder[Message[Json]]
+
+  implicit val jsonEncoderJson: Encoder[Message[Json]] =
+    deriveEncoder[Message[Json]]
+
+  implicit def jsonDecoder[A](implicit da: Decoder[A]): Decoder[Message[A]] =
+    jsonDecoderJson.emap(mj =>
+      da.decodeJson(mj.body).map(b => mj.copy(body = b)).left.map(_.message)
+    )
+
+  implicit def jsonEncoder[A](implicit ea: Encoder[A]): Encoder[Message[A]] =
+    jsonEncoderJson.contramap(m => m.copy(body = ea(m.body)))
+}

modules/pubsub/api/src/main/scala/docspell/pubsub/api/MessageHead.scala

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.api
+
+import docspell.common.{Ident, Timestamp}
+
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+import io.circe.{Decoder, Encoder}
+
+final case class MessageHead(id: Ident, send: Timestamp, topic: Topic)
+
+object MessageHead {
+  implicit val jsonDecoder: Decoder[MessageHead] =
+    deriveDecoder[MessageHead]
+
+  implicit val jsonEncoder: Encoder[MessageHead] =
+    deriveEncoder[MessageHead]
+}

modules/pubsub/api/src/main/scala/docspell/pubsub/api/PubSub.scala

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.api
+
+import cats.Applicative
+import cats.data.NonEmptyList
+import fs2.{Pipe, Stream}
+
+import docspell.common.{Ident, Timestamp}
+
+import io.circe.Json
+
+trait PubSub[F[_]] {
+  def publish1(topic: Topic, msg: Json): F[MessageHead]
+
+  def publish(topic: Topic): Pipe[F, Json, MessageHead]
+
+  def subscribe(topics: NonEmptyList[Topic]): Stream[F, Message[Json]]
+}
+object PubSub {
+  def noop[F[_]: Applicative]: PubSub[F] =
+    new PubSub[F] {
+      def publish1(topic: Topic, msg: Json): F[MessageHead] =
+        Applicative[F].pure(MessageHead(Ident.unsafe("0"), Timestamp.Epoch, topic))
+
+      def publish(topic: Topic): Pipe[F, Json, MessageHead] =
+        _ => Stream.empty
+
+      def subscribe(topics: NonEmptyList[Topic]): Stream[F, Message[Json]] =
+        Stream.empty
+    }
+}

modules/pubsub/api/src/main/scala/docspell/pubsub/api/PubSubT.scala

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.api
+
+import cats.data.NonEmptyList
+import cats.effect._
+import cats.implicits._
+import fs2.concurrent.SignallingRef
+import fs2.{Pipe, Stream}
+
+import docspell.common.Logger
+
+trait PubSubT[F[_]] {
+
+  def publish1[A](topic: TypedTopic[A], msg: A): F[MessageHead]
+
+  def publish1IgnoreErrors[A](topic: TypedTopic[A], msg: A): F[Unit]
+
+  def publish[A](topic: TypedTopic[A]): Pipe[F, A, MessageHead]
+
+  def subscribe[A](topic: TypedTopic[A]): Stream[F, Message[A]]
+
+  def subscribeSink[A](topic: TypedTopic[A])(handler: Message[A] => F[Unit]): F[F[Unit]]
+
+  def delegate: PubSub[F]
+
+  def withDelegate(delegate: PubSub[F]): PubSubT[F]
+}
+
+object PubSubT {
+  def noop[F[_]: Async]: PubSubT[F] =
+    PubSubT(PubSub.noop[F], Logger.off[F])
+
+  def apply[F[_]: Async](pubSub: PubSub[F], logger: Logger[F]): PubSubT[F] =
+    new PubSubT[F] {
+      def publish1[A](topic: TypedTopic[A], msg: A): F[MessageHead] =
+        pubSub.publish1(topic.topic, topic.codec(msg))
+
+      def publish1IgnoreErrors[A](topic: TypedTopic[A], msg: A): F[Unit] =
+        publish1(topic, msg).attempt.flatMap {
+          case Right(_) => ().pure[F]
+          case Left(ex) =>
+            logger.error(ex)(s"Error publishing to topic ${topic.topic.name}: $msg")
+        }
+
+      def publish[A](topic: TypedTopic[A]): Pipe[F, A, MessageHead] =
+        _.map(topic.codec.apply).through(pubSub.publish(topic.topic))
+
+      def subscribe[A](topic: TypedTopic[A]): Stream[F, Message[A]] =
+        pubSub
+          .subscribe(NonEmptyList.of(topic.topic))
+          .flatMap(m =>
+            m.body.as[A](topic.codec) match {
+              case Right(a) => Stream.emit(Message(m.head, a))
+              case Left(err) =>
+                logger.s
+                  .error(err)(
+                    s"Could not decode message to topic ${topic.name} to ${topic.msgClass}: ${m.body.noSpaces}"
+                  )
+                  .drain
+            }
+          )
+
+      def subscribeSink[A](
+          topic: TypedTopic[A]
+      )(handler: Message[A] => F[Unit]): F[F[Unit]] =
+        for {
+          halt <- SignallingRef.of[F, Boolean](false)
+          _ <- subscribe(topic)
+            .evalMap(handler)
+            .interruptWhen(halt)
+            .compile
+            .drain
+        } yield halt.set(true)
+
+      def delegate: PubSub[F] = pubSub
+
+      def withDelegate(newDelegate: PubSub[F]): PubSubT[F] =
+        PubSubT(newDelegate, logger)
+    }
+}

modules/pubsub/api/src/main/scala/docspell/pubsub/api/Topic.scala

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.api
+
+import io.circe.{Decoder, Encoder}
+
+final case class Topic private (topic: String) {
+  def name: String = topic
+}
+
+object Topic {
+  implicit val jsonDecoder: Decoder[Topic] =
+    Decoder.decodeString.map(Topic.apply)
+
+  implicit val jsonEncoder: Encoder[Topic] =
+    Encoder.encodeString.contramap(_.topic)
+
+  def apply(name: String): Topic = {
+    require(name.trim.nonEmpty)
+    new Topic(name)
+  }
+}

modules/pubsub/api/src/main/scala/docspell/pubsub/api/TypedTopic.scala

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.api
+
+import scala.reflect.{ClassTag, classTag}
+
+import io.circe.{Codec, Decoder, Encoder}
+
+final case class TypedTopic[A](topic: Topic, codec: Codec[A], msgClass: Class[_]) {
+  def name: String = topic.name
+
+  def withTopic(topic: Topic): TypedTopic[A] =
+    copy(topic = topic)
+
+  def withName(name: String): TypedTopic[A] =
+    withTopic(Topic(name))
+}
+
+object TypedTopic {
+
+  def apply[A: ClassTag](
+      topic: Topic
+  )(implicit dec: Decoder[A], enc: Encoder[A]): TypedTopic[A] =
+    TypedTopic(topic, Codec.from(dec, enc), classTag[A].runtimeClass)
+}

modules/pubsub/naive/src/main/scala/docspell/pubsub/naive/NaivePubSub.scala

@@ -0,0 +1,205 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.naive
+
+import cats.data.NonEmptyList
+import cats.effect._
+import cats.implicits._
+import fs2.Pipe
+import fs2.Stream
+import fs2.concurrent.{Topic => Fs2Topic}
+
+import docspell.common._
+import docspell.pubsub.api._
+import docspell.pubsub.naive.NaivePubSub.State
+import docspell.store.Store
+import docspell.store.records.RPubSub
+
+import io.circe.Json
+import org.http4s.circe.CirceEntityCodec._
+import org.http4s.client.Client
+import org.http4s.client.dsl.Http4sClientDsl
+import org.http4s.dsl.Http4sDsl
+import org.http4s.{HttpRoutes, Uri}
+
+/** A pubsub implementation that can be used across machines, using a rather inefficient
+  * but simple protocol. It can therefore work with the current setup, i.e. not requiring
+  * to add another complex piece of software to the mix, like Kafka or RabbitMQ.
+  *
+  * However, the api should allow to be used on top of such a tool. This implementation
+  * can be used in a personal setting, where there are only a few nodes.
+  *
+  * How it works: Each node has a set of local subscribers and a http endpoint. If it
+  * publishes a message, it notifies all local subscribers and sends out a json message to
+  * all endpoints that are registered for this topic. If it receives a messagen through
+  * its endpoint, it notifies all local subscribers.
+  *
+  * It is build on the `Topic` class from fs2.concurrent. A map of the name to such a
+  * `Topic` instance is maintained. To work across machines, the database is used as a
+  * synchronization point. Each node must provide a http api and so its "callback" URL is
+  * added into the database associated to a topic name.
+  *
+  * When publishing a message, the message can be published to the internal fs2 topic.
+  * Then all URLs to this topic name are looked up in the database and the message is
+  * POSTed to each URL as JSON. The endpoint of each machine takes this message and
+  * publishes it to its own internal fs2.concurrent.Topic instance.
+  *
+  * Obviously, this doesn't scale well to lots of machines and messages. It should be good
+  * enough for personal use, where there are only a small amount of machines and messages.
+  *
+  * The main use case for docspell is to communicate between the rest-server and job
+  * executor. It is for internal communication and all topics are known at compile time.
+  */
+final class NaivePubSub[F[_]: Async](
+    cfg: PubSubConfig,
+    state: Ref[F, State[F]],
+    store: Store[F],
+    client: Client[F]
+) extends PubSub[F] {
+  private val logger: Logger[F] = Logger.log4s(org.log4s.getLogger)
+
+  def withClient(client: Client[F]): NaivePubSub[F] =
+    new NaivePubSub[F](cfg, state, store, client)
+
+  def publish1(topic: Topic, msgBody: Json): F[MessageHead] =
+    for {
+      head <- mkMessageHead(topic)
+      msg = Message(head, msgBody)
+      _ <- logger.trace(s"Publishing: $msg")
+      // go through all local subscribers and publish to the fs2 topic
+      _ <- publishLocal(msg)
+      // get all remote subscribers from the database and send the message via http
+      _ <- publishRemote(msg)
+    } yield head
+
+  def publish(topic: Topic): Pipe[F, Json, MessageHead] =
+    ms => //TODO Do some optimization by grouping messages to the same topic
+      ms.evalMap(publish1(topic, _))
+
+  def subscribe(topics: NonEmptyList[Topic]): Stream[F, Message[Json]] =
+    (for {
+      _ <- logger.s.info(s"Adding subscriber for topics: $topics")
+      _ <- Stream.resource[F, Unit](addRemote(topics))
+      m <- Stream.eval(addLocal(topics))
+    } yield m).flatten
+
+  /** Receive messages from remote publishers and passes them to the local subscribers. */
+  def receiveRoute: HttpRoutes[F] = {
+    val dsl = new Http4sDsl[F] {}
+    import dsl._
+
+    HttpRoutes.of { case req @ POST -> Root =>
+      for {
+        data <- req.as[List[Message[Json]]]
+        _ <- logger.trace(s"Received external message(s): $data")
+        _ <- data.traverse(publishLocal)
+        resp <- Ok(())
+      } yield resp
+    }
+  }
+
+  // ---- private helpers
+
+  private def mkMessageHead(topic: Topic): F[MessageHead] =
+    for {
+      id <- Ident.randomId[F]
+      ts <- Timestamp.current[F]
+      head = MessageHead(id, ts, topic)
+    } yield head
+
+  private def addLocal(topics: NonEmptyList[Topic]): F[Stream[F, Message[Json]]] = {
+    val topicSet = topics.map(_.name).toList.toSet
+    for {
+      st <- state.get
+      tpc = st.topics.view.filterKeys(topicSet.contains)
+      _ <-
+        if (tpc.isEmpty)
+          logger.warn(s"Subscribing to 0 topics! Topics $topics were not initialized")
+        else ().pure[F]
+      data = tpc.values.toList.traverse(t => t.subscribe(cfg.subscriberQueueSize))
+      out = data.flatMap(msgs => Stream.emits(msgs))
+    } yield out
+  }
+
+  private def addRemote(topics: NonEmptyList[Topic]): Resource[F, Unit] = {
+    def subscribe: F[Unit] =
+      logger.trace(s"Incrementing counter for topics: $topics") *>
+        store.transact(RPubSub.increment(cfg.url, topics.map(_.name))).as(())
+
+    def unsubscribe: F[Unit] =
+      logger.trace(s"Decrementing counter for topics: $topics") *>
+        store.transact(RPubSub.decrement(cfg.url, topics.map(_.name))).as(())
+
+    Resource.make(subscribe)(_ => unsubscribe)
+  }
+
+  private def publishLocal(msg: Message[Json]): F[Unit] =
+    for {
+      st <- state.get
+      _ <- st.topics.get(msg.head.topic.name) match {
+        case Some(sub) =>
+          logger.trace(s"Publishing message to local topic: $msg") *>
+            sub.publish1(msg).as(())
+        case None =>
+          ().pure[F]
+      }
+    } yield ()
+
+  private def publishRemote(msg: Message[Json]): F[Unit] = {
+    val dsl = new Http4sDsl[F] with Http4sClientDsl[F] {}
+    import dsl._
+
+    for {
+      _ <- logger.trace(s"Find all nodes subscribed to topic ${msg.head.topic.name}")
+      urls <- store.transact(RPubSub.findSubs(msg.head.topic.name, cfg.nodeId))
+      _ <- logger.trace(s"Publishing to remote urls ${urls.map(_.asString)}: $msg")
+      reqs = urls
+        .map(u => Uri.unsafeFromString(u.asString))
+        .map(uri => POST(List(msg), uri))
+      resList <- reqs.traverse(req => client.status(req).attempt)
+      _ <- resList.traverse {
+        case Right(s) =>
+          if (s.isSuccess) ().pure[F]
+          else logger.warn(s"A node was not reached! Reason: $s, message: $msg")
+        case Left(ex) =>
+          logger.error(ex)(s"Error publishing ${msg.head.topic.name} message remotely")
+      }
+    } yield ()
+  }
+}
+
+object NaivePubSub {
+
+  def apply[F[_]: Async](
+      cfg: PubSubConfig,
+      store: Store[F],
+      client: Client[F]
+  )(topics: NonEmptyList[Topic]): Resource[F, NaivePubSub[F]] =
+    Resource.eval(for {
+      state <- Ref.ofEffect[F, State[F]](State.create[F](topics))
+      _ <- store.transact(RPubSub.initTopics(cfg.nodeId, cfg.url, topics.map(_.name)))
+    } yield new NaivePubSub[F](cfg, state, store, client))
+
+  def create[F[_]: Async](
+      cfg: PubSubConfig,
+      store: Store[F],
+      client: Client[F],
+      logger: Logger[F]
+  )(topics: NonEmptyList[Topic]): Resource[F, PubSubT[F]] =
+    apply[F](cfg, store, client)(topics).map(ps => PubSubT(ps, logger))
+
+  final case class State[F[_]](topics: Map[String, Fs2Topic[F, Message[Json]]]) {}
+
+  object State {
+    def empty[F[_]]: State[F] = State[F](Map.empty)
+    def create[F[_]: Async](topics: NonEmptyList[Topic]): F[State[F]] =
+      topics
+        .traverse(t => Fs2Topic[F, Message[Json]].map(fs2t => t.name -> fs2t))
+        .map(_.toList.toMap)
+        .map(State.apply)
+  }
+}

modules/pubsub/naive/src/main/scala/docspell/pubsub/naive/PubSubConfig.scala

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.naive
+
+import docspell.common.{Ident, LenientUri}
+
+case class PubSubConfig(nodeId: Ident, url: LenientUri, subscriberQueueSize: Int)

modules/pubsub/naive/src/test/scala/docspell/pubsub/naive/Fixtures.scala

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.naive
+
+import cats.effect._
+
+import docspell.common._
+import docspell.pubsub.api._
+import docspell.store.{Store, StoreFixture}
+
+import munit.CatsEffectSuite
+import org.http4s.Response
+import org.http4s.client.Client
+
+trait Fixtures extends HttpClientOps { self: CatsEffectSuite =>
+
+  val pubsubEnv = ResourceFixture(Fixtures.envResource("node-1"))
+
+  val pubsubT = ResourceFixture {
+    Fixtures
+      .envResource("node-1")
+      .flatMap(_.pubSub)
+      .map(ps => PubSubT(ps, Fixtures.loggerIO))
+  }
+
+  def conntectedPubsubs(env: Fixtures.Env) =
+    for {
+      // Create two pubsub instances connected to the same database
+      ps_1 <- env.withNodeId("node-1").pubSubT
+      ps_2 <- env.withNodeId("node-2").pubSubT
+
+      // both instances have a dummy client. now connect their clients to each other
+      ps1 = ps_1.withDelegate(ps_1.delegateT.withClient(httpClient(ps_2)))
+      ps2 = ps_2.withDelegate(ps_2.delegateT.withClient(httpClient(ps_1)))
+    } yield (ps1, ps2)
+
+  implicit final class StringId(s: String) {
+    def id: Ident = Ident.unsafe(s)
+  }
+}
+
+object Fixtures {
+  private val loggerIO: Logger[IO] = Logger.log4s(org.log4s.getLogger)
+
+  final case class Env(store: Store[IO], cfg: PubSubConfig) {
+    def pubSub: Resource[IO, NaivePubSub[IO]] = {
+      val dummyClient = Client[IO](_ => Resource.pure(Response.notFound[IO]))
+      NaivePubSub(cfg, store, dummyClient)(Topics.all.map(_.topic))
+    }
+    def pubSubT: Resource[IO, PubSubT[IO]] =
+      pubSub.map(PubSubT(_, loggerIO))
+
+    def withNodeId(nodeId: String): Env =
+      copy(cfg =
+        cfg.copy(
+          nodeId = Ident.unsafe(nodeId),
+          url = LenientUri.unsafe(s"http://$nodeId/")
+        )
+      )
+  }
+
+  def testConfig(nodeId: String) =
+    PubSubConfig(
+      Ident.unsafe(nodeId),
+      LenientUri.unsafe(s"http://$nodeId/"),
+      0
+    )
+
+  def storeResource: Resource[IO, Store[IO]] =
+    for {
+      random <- Resource.eval(Ident.randomId[IO])
+      cfg = StoreFixture.memoryDB(random.id.take(12))
+      store <- StoreFixture.store(cfg)
+      _ <- Resource.eval(store.migrate)
+    } yield store
+
+  def envResource(nodeId: String): Resource[IO, Env] =
+    for {
+      store <- storeResource
+    } yield Env(store, testConfig(nodeId))
+}

modules/pubsub/naive/src/test/scala/docspell/pubsub/naive/HttpClientOps.scala

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.naive
+
+import cats.effect._
+
+import docspell.common._
+import docspell.pubsub.api._
+
+import io.circe.Encoder
+import org.http4s.circe.CirceEntityCodec._
+import org.http4s.client.Client
+import org.http4s.client.dsl.io._
+import org.http4s.dsl.io._
+import org.http4s.{HttpApp, HttpRoutes, Uri}
+
+trait HttpClientOps {
+  def httpClient(routes: HttpRoutes[IO]): Client[IO] =
+    Client.fromHttpApp(HttpApp(routes.orNotFound.run))
+
+  def httpClient(ps: NaivePubSub[IO]): Client[IO] =
+    httpClient(ps.receiveRoute)
+
+  def httpClient(ps: PubSubT[IO]): Client[IO] =
+    httpClient(ps.delegateT)
+
+  implicit final class ClientOps(client: Client[IO]) {
+    val uri = Uri.unsafeFromString("http://localhost/")
+
+    def sendMessage[A: Encoder](topic: Topic, body: A): IO[Unit] = {
+      val encode: Encoder[List[Message[A]]] = implicitly[Encoder[List[Message[A]]]]
+
+      for {
+        id <- Ident.randomId[IO]
+        time <- Timestamp.current[IO]
+        mesg = List(Message(MessageHead(id, time, topic), body))
+        _ <- HttpClientOps.logger.debug(s"Sending message(s): $mesg")
+        _ <- client.expectOr[Unit](POST(encode(mesg), uri)) { resp =>
+          IO(new Exception(s"Unexpected response: $resp"))
+        }
+      } yield ()
+    }
+
+    def send[A](typedTopic: TypedTopic[A], body: A): IO[Unit] =
+      sendMessage(typedTopic.topic, body)(typedTopic.codec)
+  }
+
+  implicit final class PubSubTestOps(ps: PubSubT[IO]) {
+    def delegateT: NaivePubSub[IO] = ps.delegate.asInstanceOf[NaivePubSub[IO]]
+  }
+}
+
+object HttpClientOps {
+  private val logger: Logger[IO] = Logger.log4s(org.log4s.getLogger)
+}

modules/pubsub/naive/src/test/scala/docspell/pubsub/naive/NaivePubSubTest.scala

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.naive
+
+import scala.concurrent.duration._
+
+import cats.effect._
+import cats.implicits._
+import fs2.concurrent.SignallingRef
+
+import docspell.common._
+import docspell.pubsub.api._
+import docspell.pubsub.naive.Topics._
+
+import munit.CatsEffectSuite
+
+class NaivePubSubTest extends CatsEffectSuite with Fixtures {
+  private[this] val logger = Logger.log4s[IO](org.log4s.getLogger)
+
+  def subscribe[A](ps: PubSubT[IO], topic: TypedTopic[A]) =
+    for {
+      received <- Ref.of[IO, Option[Message[A]]](None)
+      halt <- SignallingRef.of[IO, Boolean](false)
+      fiber <- Async[IO].start(
+        logger.debug(s"${Thread.currentThread()} Listening for messages...") *>
+          ps.subscribe(topic)
+            .evalMap(m =>
+              logger.debug(s"Handling message: $m") *>
+                received.set(Some(m)) *>
+                halt.set(true)
+            )
+            .interruptWhen(halt)
+            .compile
+            .drain
+      )
+      _ <- IO.sleep(500.millis)
+    } yield (received, halt, fiber)
+
+  pubsubT.test("local publish receives message") { ps =>
+    for {
+      res <- subscribe(ps, Topics.jobSubmitted)
+      (received, _, subFiber) = res
+      headSend <- ps.publish1(Topics.jobSubmitted, JobSubmittedMsg("hello".id))
+      outcome <- subFiber.join
+      msgRec <- received.get
+      _ = assert(outcome.isSuccess)
+      _ = assertEquals(msgRec.map(_.head), Option(headSend))
+    } yield ()
+  }
+
+  pubsubT.test("local publish to different topic doesn't receive") { ps =>
+    val otherTopic = Topics.jobSubmitted.withTopic(Topic("other-name"))
+    for {
+      res <- subscribe(ps, Topics.jobSubmitted)
+      (received, halt, subFiber) = res
+      _ <- ps.publish1(otherTopic, JobSubmittedMsg("hello".id))
+      _ <- IO.sleep(100.millis) //allow some time for receiving
+      _ <- halt.set(true)
+      outcome <- subFiber.join
+      _ = assert(outcome.isSuccess)
+      recMsg <- received.get
+      _ = assert(recMsg.isEmpty)
+    } yield ()
+  }
+
+  pubsubT.test("receive messages remotely") { ps =>
+    val msg = JobSubmittedMsg("hello-remote".id)
+    for {
+      res <- subscribe(ps, Topics.jobSubmitted)
+      (received, _, subFiber) = res
+      client = httpClient(ps.delegateT.receiveRoute)
+      _ <- client.send(Topics.jobSubmitted, msg)
+      outcome <- subFiber.join
+      msgRec <- received.get
+      _ = assert(outcome.isSuccess)
+      _ = assertEquals(msgRec.map(_.head.topic), Topics.jobSubmitted.topic.some)
+      _ = assertEquals(msgRec.map(_.body), msg.some)
+    } yield ()
+  }
+
+  pubsubEnv.test("send messages remotely") { env =>
+    val msg = JobSubmittedMsg("hello-remote".id)
+
+    // Create two pubsub instances connected to the same database
+    conntectedPubsubs(env).use { case (ps1, ps2) =>
+      for {
+        // subscribe to ps1 and send via ps2
+        res <- subscribe(ps1, Topics.jobSubmitted)
+        (received, _, subFiber) = res
+        _ <- ps2.publish1(Topics.jobSubmitted, msg)
+        outcome <- subFiber.join
+        msgRec <- received.get
+
+        // check results
+        _ = assert(outcome.isSuccess)
+        _ = assertEquals(msgRec.map(_.head.topic), Topics.jobSubmitted.topic.some)
+        _ = assertEquals(msgRec.map(_.body), msg.some)
+      } yield ()
+    }
+  }
+
+  pubsubEnv.test("do not receive remote message from other topic") { env =>
+    val msg = JobCancelMsg("job-1".id)
+
+    // Create two pubsub instances connected to the same database
+    conntectedPubsubs(env).use { case (ps1, ps2) =>
+      for {
+        // subscribe to ps1 and send via ps2
+        res <- subscribe(ps1, Topics.jobSubmitted)
+        (received, halt, subFiber) = res
+        _ <- ps2.publish1(Topics.jobCancel, msg)
+        _ <- IO.sleep(100.millis)
+        _ <- halt.set(true)
+        outcome <- subFiber.join
+        msgRec <- received.get
+
+        // check results
+        _ = assert(outcome.isSuccess)
+        _ = assertEquals(msgRec, None)
+      } yield ()
+    }
+
+  }
+}

modules/pubsub/naive/src/test/scala/docspell/pubsub/naive/Topics.scala

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.pubsub.naive
+
+import cats.data.NonEmptyList
+
+import docspell.common.Ident
+import docspell.pubsub.api._
+
+import io.circe.generic.semiauto.{deriveDecoder, deriveEncoder}
+import io.circe.{Decoder, Encoder}
+
+object Topics {
+  val jobSubmitted: TypedTopic[JobSubmittedMsg] =
+    TypedTopic[JobSubmittedMsg](Topic("test-job-submitted"))
+
+  final case class JobSubmittedMsg(task: Ident)
+  object JobSubmittedMsg {
+    implicit val encode: Encoder[JobSubmittedMsg] = deriveEncoder[JobSubmittedMsg]
+    implicit val decode: Decoder[JobSubmittedMsg] = deriveDecoder[JobSubmittedMsg]
+  }
+
+  val jobCancel: TypedTopic[JobCancelMsg] =
+    TypedTopic[JobCancelMsg](Topic("test-job-done"))
+  final case class JobCancelMsg(id: Ident)
+  object JobCancelMsg {
+    implicit val encode: Encoder[JobCancelMsg] = deriveEncoder[JobCancelMsg]
+    implicit val decode: Decoder[JobCancelMsg] = deriveDecoder[JobCancelMsg]
+  }
+
+  def all: NonEmptyList[TypedTopic[_]] =
+    NonEmptyList.of(jobSubmitted, jobCancel)
+}

modules/restserver/src/main/scala/docspell/restserver/Config.scala

@@ -11,6 +11,7 @@ import docspell.backend.{Config => BackendConfig}
 import docspell.common._
 import docspell.ftssolr.SolrConfig
 import docspell.oidc.ProviderConfig
+import docspell.pubsub.naive.PubSubConfig
 import docspell.restserver.Config.OpenIdConfig
 import docspell.restserver.auth.OpenId
 
@@ -33,6 +34,9 @@ case class Config(
 ) {
   def openIdEnabled: Boolean =
     openid.exists(_.enabled)
+
+  def pubSubConfig: PubSubConfig =
+    PubSubConfig(appId, baseUrl / "internal" / "pubsub", 100)
 }
 
 object Config {

modules/restserver/src/main/scala/docspell/restserver/Main.scala

@@ -38,12 +38,6 @@ object Main extends IOApp {
 
     pools = connectEC.map(Pools.apply)
     rc <-
-      pools.use(p =>
-        RestServer
-          .stream[IO](cfg, p)
-          .compile
-          .drain
-          .as(ExitCode.Success)
-      )
+      pools.use(p => RestServer.serve[IO](cfg, p))
   } yield rc
 }

modules/restserver/src/main/scala/docspell/restserver/RestApp.scala

@@ -10,8 +10,6 @@ import docspell.backend.BackendApp
 
 trait RestApp[F[_]] {
 
-  def init: F[Unit]
-
   def config: Config
 
   def backend: BackendApp[F]

modules/restserver/src/main/scala/docspell/restserver/RestAppImpl.scala

@@ -6,41 +6,36 @@
 
 package docspell.restserver
 
-import scala.concurrent.ExecutionContext
-
 import cats.effect._
-import cats.implicits._
 
 import docspell.backend.BackendApp
-import docspell.common.NodeType
+import docspell.common.Logger
 import docspell.ftsclient.FtsClient
 import docspell.ftssolr.SolrFtsClient
+import docspell.pubsub.api.{PubSub, PubSubT}
+import docspell.store.Store
 
 import org.http4s.client.Client
 
 final class RestAppImpl[F[_]](val config: Config, val backend: BackendApp[F])
-    extends RestApp[F] {
-
-  def init: F[Unit] =
-    backend.node.register(config.appId, NodeType.Restserver, config.baseUrl)
-
-  def shutdown: F[Unit] =
-    backend.node.unregister(config.appId)
-}
+    extends RestApp[F] {}
 
 object RestAppImpl {
 
   def create[F[_]: Async](
       cfg: Config,
-      connectEC: ExecutionContext
-  ): Resource[F, RestApp[F]] =
+      store: Store[F],
+      httpClient: Client[F],
+      pubSub: PubSub[F]
+  ): Resource[F, RestApp[F]] = {
+    val logger = Logger.log4s(org.log4s.getLogger(s"restserver-${cfg.appId.id}"))
     for {
-      backend <- BackendApp(cfg.backend, connectEC)(
-        createFtsClient[F](cfg)
-      )
+      ftsClient <- createFtsClient(cfg)(httpClient)
+      pubSubT = PubSubT(pubSub, logger)
+      backend <- BackendApp.create[F](cfg.backend, store, ftsClient, pubSubT)
       app = new RestAppImpl[F](cfg, backend)
-      appR <- Resource.make(app.init.map(_ => app))(_.shutdown)
-    } yield appR
+    } yield app
+  }
 
   private def createFtsClient[F[_]: Async](
       cfg: Config

modules/restserver/src/main/scala/docspell/restserver/RestServer.scala

@@ -6,17 +6,25 @@
 
 package docspell.restserver
 
+import scala.concurrent.duration._
+
 import cats.effect._
 import cats.implicits._
 import fs2.Stream
+import fs2.concurrent.Topic
 
 import docspell.backend.auth.{AuthToken, ShareToken}
+import docspell.backend.msg.Topics
 import docspell.common._
 import docspell.oidc.CodeFlowRoutes
+import docspell.pubsub.naive.NaivePubSub
 import docspell.restserver.auth.OpenId
 import docspell.restserver.http4s.EnvMiddleware
 import docspell.restserver.routes._
 import docspell.restserver.webapp._
+import docspell.restserver.ws.OutputEvent.KeepAlive
+import docspell.restserver.ws.{OutputEvent, WebSocketRoutes}
+import docspell.store.Store
 
 import org.http4s._
 import org.http4s.blaze.client.BlazeClientBuilder
@@ -27,55 +35,96 @@ import org.http4s.headers.Location
 import org.http4s.implicits._
 import org.http4s.server.Router
 import org.http4s.server.middleware.Logger
+import org.http4s.server.websocket.WebSocketBuilder2
 
 object RestServer {
 
-  def stream[F[_]: Async](cfg: Config, pools: Pools): Stream[F, Nothing] = {
+  def serve[F[_]: Async](cfg: Config, pools: Pools): F[ExitCode] =
+    for {
+      wsTopic <- Topic[F, OutputEvent]
+      keepAlive = Stream
+        .awakeEvery[F](30.seconds)
+        .map(_ => KeepAlive)
+        .through(wsTopic.publish)
 
-    val templates = TemplateRoutes[F](cfg)
-    val app = for {
-      restApp <- RestAppImpl.create[F](cfg, pools.connectEC)
+      server =
+        Stream
+          .resource(createApp(cfg, pools))
+          .flatMap { case (restApp, pubSub, httpClient) =>
+            Stream(
+              Subscriptions(wsTopic, restApp.backend.pubSub),
+              BlazeServerBuilder[F]
+                .bindHttp(cfg.bind.port, cfg.bind.address)
+                .withoutBanner
+                .withHttpWebSocketApp(
+                  createHttpApp(cfg, httpClient, pubSub, restApp, wsTopic)
+                )
+                .serve
+                .drain
+            )
+          }
+
+      exit <-
+        (server ++ Stream(keepAlive)).parJoinUnbounded.compile.drain.as(ExitCode.Success)
+    } yield exit
+
+  def createApp[F[_]: Async](
+      cfg: Config,
+      pools: Pools
+  ): Resource[F, (RestApp[F], NaivePubSub[F], Client[F])] =
+    for {
       httpClient <- BlazeClientBuilder[F].resource
-      httpApp = Router(
-        "/api/info" -> routes.InfoRoutes(),
-        "/api/v1/open/" -> openRoutes(cfg, httpClient, restApp),
-        "/api/v1/sec/" -> Authenticate(restApp.backend.login, cfg.auth) { token =>
-          securedRoutes(cfg, restApp, token)
-        },
-        "/api/v1/admin" -> AdminAuth(cfg.adminEndpoint) {
-          adminRoutes(cfg, restApp)
-        },
-        "/api/v1/share" -> ShareAuth(restApp.backend.share, cfg.auth) { token =>
-          shareRoutes(cfg, restApp, token)
-        },
-        "/api/doc" -> templates.doc,
-        "/app/assets" -> EnvMiddleware(WebjarRoutes.appRoutes[F]),
-        "/app" -> EnvMiddleware(templates.app),
-        "/sw.js" -> EnvMiddleware(templates.serviceWorker),
-        "/" -> redirectTo("/app")
-      ).orNotFound
-
-      finalHttpApp = Logger.httpApp(logHeaders = false, logBody = false)(httpApp)
-
-    } yield finalHttpApp
-
-    Stream
-      .resource(app)
-      .flatMap(httpApp =>
-        BlazeServerBuilder[F]
-          .bindHttp(cfg.bind.port, cfg.bind.address)
-          .withHttpApp(httpApp)
-          .withoutBanner
-          .serve
+      store <- Store.create[F](
+        cfg.backend.jdbc,
+        cfg.backend.files.chunkSize,
+        pools.connectEC
       )
-  }.drain
+      pubSub <- NaivePubSub(cfg.pubSubConfig, store, httpClient)(Topics.all.map(_.topic))
+      restApp <- RestAppImpl.create[F](cfg, store, httpClient, pubSub)
+    } yield (restApp, pubSub, httpClient)
+
+  def createHttpApp[F[_]: Async](
+      cfg: Config,
+      httpClient: Client[F],
+      pubSub: NaivePubSub[F],
+      restApp: RestApp[F],
+      topic: Topic[F, OutputEvent]
+  )(
+      wsB: WebSocketBuilder2[F]
+  ) = {
+    val templates = TemplateRoutes[F](cfg)
+    val httpApp = Router(
+      "/internal/pubsub" -> pubSub.receiveRoute,
+      "/api/info" -> routes.InfoRoutes(),
+      "/api/v1/open/" -> openRoutes(cfg, httpClient, restApp),
+      "/api/v1/sec/" -> Authenticate(restApp.backend.login, cfg.auth) { token =>
+        securedRoutes(cfg, restApp, wsB, topic, token)
+      },
+      "/api/v1/admin" -> AdminAuth(cfg.adminEndpoint) {
+        adminRoutes(cfg, restApp)
+      },
+      "/api/v1/share" -> ShareAuth(restApp.backend.share, cfg.auth) { token =>
+        shareRoutes(cfg, restApp, token)
+      },
+      "/api/doc" -> templates.doc,
+      "/app/assets" -> EnvMiddleware(WebjarRoutes.appRoutes[F]),
+      "/app" -> EnvMiddleware(templates.app),
+      "/sw.js" -> EnvMiddleware(templates.serviceWorker),
+      "/" -> redirectTo("/app")
+    ).orNotFound
+
+    Logger.httpApp(logHeaders = false, logBody = false)(httpApp)
+  }
 
   def securedRoutes[F[_]: Async](
       cfg: Config,
       restApp: RestApp[F],
+      wsB: WebSocketBuilder2[F],
+      topic: Topic[F, OutputEvent],
       token: AuthToken
   ): HttpRoutes[F] =
     Router(
+      "ws" -> WebSocketRoutes(token, topic, wsB),
       "auth" -> LoginRoutes.session(restApp.backend.login, cfg, token),
       "tag" -> TagRoutes(restApp.backend, token),
       "equipment" -> EquipmentRoutes(restApp.backend, token),

modules/restserver/src/main/scala/docspell/restserver/Subscriptions.scala

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restserver
+
+import fs2.Stream
+import fs2.concurrent.Topic
+
+import docspell.backend.msg.JobDone
+import docspell.common._
+import docspell.common.syntax.StringSyntax._
+import docspell.pubsub.api.PubSubT
+import docspell.restserver.ws.OutputEvent
+
+/** Subscribes to those events from docspell that are forwarded to the websocket endpoints
+  */
+object Subscriptions {
+
+  def apply[F[_]](
+      wsTopic: Topic[F, OutputEvent],
+      pubSub: PubSubT[F]
+  ): Stream[F, Nothing] =
+    jobDone(pubSub).through(wsTopic.publish)
+
+  def jobDone[F[_]](pubSub: PubSubT[F]): Stream[F, OutputEvent] =
+    pubSub
+      .subscribe(JobDone.topic)
+      .filter(m => m.body.task == ProcessItemArgs.taskName)
+      .map(m => m.body.args.parseJsonAs[ProcessItemArgs])
+      .collect { case Right(a) => OutputEvent.ItemProcessed(a.meta.collective) }
+
+}

modules/restserver/src/main/scala/docspell/restserver/ws/InputMessage.scala

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restserver.ws
+
+sealed trait InputMessage
+
+object InputMessage {}

modules/restserver/src/main/scala/docspell/restserver/ws/OutputEvent.scala

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restserver.ws
+
+import docspell.backend.auth.AuthToken
+import docspell.common._
+
+sealed trait OutputEvent {
+  def forCollective(token: AuthToken): Boolean
+  def encode: String
+}
+
+object OutputEvent {
+
+  case object KeepAlive extends OutputEvent {
+    def forCollective(token: AuthToken): Boolean = true
+    def encode: String = "keep-alive"
+  }
+
+  final case class ItemProcessed(collective: Ident) extends OutputEvent {
+    def forCollective(token: AuthToken): Boolean =
+      token.account.collective == collective
+
+    def encode: String =
+      "item-processed"
+  }
+
+}

modules/restserver/src/main/scala/docspell/restserver/ws/WebSocketRoutes.scala

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.restserver.ws
+
+import cats.effect.Async
+import fs2.concurrent.Topic
+import fs2.{Pipe, Stream}
+
+import docspell.backend.auth.AuthToken
+
+import org.http4s.HttpRoutes
+import org.http4s.dsl.Http4sDsl
+import org.http4s.server.websocket.WebSocketBuilder2
+import org.http4s.websocket.WebSocketFrame
+import org.http4s.websocket.WebSocketFrame.Text
+
+object WebSocketRoutes {
+
+  def apply[F[_]: Async](
+      user: AuthToken,
+      topic: Topic[F, OutputEvent],
+      wsb: WebSocketBuilder2[F]
+  ): HttpRoutes[F] = {
+    val dsl = new Http4sDsl[F] {}
+    import dsl._
+
+    HttpRoutes.of { case GET -> Root =>
+      val toClient: Stream[F, WebSocketFrame.Text] =
+        topic
+          .subscribe(500)
+          .filter(_.forCollective(user))
+          .map(msg => Text(msg.encode))
+
+      val toServer: Pipe[F, WebSocketFrame, Unit] =
+        _.map(_ => ())
+
+      wsb.build(toClient, toServer)
+    }
+  }
+}

modules/store/src/main/resources/db/migration/h2/V1.28.0__pubsub.sql

@@ -0,0 +1,8 @@
+CREATE TABLE "pubsub" (
+  "id" varchar(254) not null primary key,
+  "node_id" varchar(254) not null,
+  "url" varchar(254) not null,
+  "topic" varchar(254) not null,
+  "counter" int not null,
+  unique("url", "topic")
+)

modules/store/src/main/resources/db/migration/mariadb/V1.28.0__pubsub.sql

@@ -0,0 +1,8 @@
+CREATE TABLE `pubsub` (
+  `id` varchar(254) not null primary key,
+  `node_id` varchar(254) not null,
+  `url` varchar(254) not null,
+  `topic` varchar(254) not null,
+  `counter` int not null,
+  unique(`url`, `topic`)
+)

modules/store/src/main/resources/db/migration/postgresql/V1.28.0__pubsub.sql

@@ -0,0 +1,8 @@
+CREATE TABLE "pubsub" (
+  "id" varchar(254) not null primary key,
+  "node_id" varchar(254) not null,
+  "url" varchar(254) not null,
+  "topic" varchar(254) not null,
+  "counter" int not null,
+  unique("url", "topic")
+)

modules/store/src/main/scala/docspell/store/records/RPubSub.scala

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2020 Eike K. & Contributors
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+package docspell.store.records
+
+import cats.data.NonEmptyList
+import cats.implicits._
+
+import docspell.common._
+import docspell.store.qb.DSL._
+import docspell.store.qb.{Column, DML, TableDef}
+
+import doobie._
+import doobie.implicits._
+
+/** A table for supporting naive pubsub across nodes. */
+final case class RPubSub(
+    id: Ident,
+    nodeId: Ident,
+    url: LenientUri,
+    topic: String,
+    counter: Int
+)
+
+object RPubSub {
+  final case class Table(alias: Option[String]) extends TableDef {
+    val tableName: String = "pubsub"
+
+    val id = Column[Ident]("id", this)
+    val nodeId = Column[Ident]("node_id", this)
+    val url = Column[LenientUri]("url", this)
+    val topic = Column[String]("topic", this)
+    val counter = Column[Int]("counter", this)
+
+    val all: NonEmptyList[Column[_]] =
+      NonEmptyList.of(id, nodeId, url, topic, counter)
+  }
+  def as(alias: String): Table =
+    Table(Some(alias))
+
+  val T: Table = Table(None)
+
+  def insert(r: RPubSub): ConnectionIO[Int] =
+    DML.insert(T, T.all, sql"${r.id}, ${r.nodeId}, ${r.url}, ${r.topic}, ${r.counter}")
+
+  /** Insert all topics with counter = 0 */
+  def initTopics(
+      nodeId: Ident,
+      url: LenientUri,
+      topics: NonEmptyList[String]
+  ): ConnectionIO[Int] =
+    DML.delete(T, T.nodeId === nodeId) *>
+      topics.toList
+        .traverse(t =>
+          Ident
+            .randomId[ConnectionIO]
+            .flatMap(id => insert(RPubSub(id, nodeId, url, t, 0)))
+        )
+        .map(_.sum)
+
+  def increment(url: LenientUri, topics: NonEmptyList[String]): ConnectionIO[Int] =
+    DML.update(
+      T,
+      T.url === url && T.topic.in(topics),
+      DML.set(
+        T.counter.increment(1)
+      )
+    )
+
+  def decrement(url: LenientUri, topics: NonEmptyList[String]): ConnectionIO[Int] =
+    DML.update(
+      T,
+      T.url === url && T.topic.in(topics),
+      DML.set(
+        T.counter.decrement(1)
+      )
+    )
+
+  def findSubs(topic: String, excludeNode: Ident): ConnectionIO[List[LenientUri]] =
+    run(
+      select(T.url),
+      from(T),
+      T.topic === topic && T.counter > 0 && T.nodeId <> excludeNode
+    )
+      .query[LenientUri]
+      .to[List]
+}

modules/store/src/test/resources/logback-test.xml

@@ -3,7 +3,7 @@
         <withJansi>true</withJansi>
 
         <encoder>
-            <pattern>%highlight(%-5level) %cyan(%logger{15}) - %msg %n</pattern>
+            <pattern>%highlight(%-5level) [%t{10}] %cyan(%logger{15}) - %msg %n</pattern>
         </encoder>
     </appender>
 

modules/webapp/src/main/elm/App/Data.elm

@@ -64,6 +64,7 @@ type alias Model =
     , anonymousTheme : UiTheme
     , anonymousUiLang : UiLanguage
     , langMenuOpen : Bool
+    , showNewItemsArrived : Bool
     }
 
 
@@ -126,6 +127,7 @@ init key url flags_ settings =
       , anonymousTheme = Data.UiTheme.Light
       , anonymousUiLang = Messages.UiLanguage.English
       , langMenuOpen = False
+      , showNewItemsArrived = False
       }
     , Cmd.batch
         [ Cmd.map UserSettingsMsg uc
@@ -190,6 +192,8 @@ type Msg
     | SetLanguage UiLanguage
     | ClientSettingsSaveResp UiSettings (Result Http.Error BasicResult)
     | ReceiveBrowserSettings StoredUiSettings
+    | ReceiveWsMessage String
+    | ToggleShowNewItemsArrived
 
 
 defaultPage : Flags -> Page

modules/webapp/src/main/elm/App/Update.elm

@@ -15,6 +15,7 @@ import App.Data exposing (..)
 import Browser exposing (UrlRequest(..))
 import Browser.Navigation as Nav
 import Data.Flags
+import Data.ServerEvent exposing (ServerEvent(..))
 import Data.UiSettings exposing (UiSettings)
 import Data.UiTheme
 import Messages exposing (Messages)
@@ -308,6 +309,33 @@ updateWithSub msg model =
             in
             updateUserSettings texts lm model
 
+        ReceiveWsMessage data ->
+            let
+                se =
+                    Data.ServerEvent.fromString data
+            in
+            case se of
+                Just ItemProcessed ->
+                    let
+                        newModel =
+                            { model | showNewItemsArrived = True }
+                    in
+                    case model.page of
+                        HomePage ->
+                            updateHome texts Page.Home.Data.RefreshView newModel
+
+                        _ ->
+                            ( newModel, Cmd.none, Sub.none )
+
+                Nothing ->
+                    ( model, Cmd.none, Sub.none )
+
+        ToggleShowNewItemsArrived ->
+            ( { model | showNewItemsArrived = not model.showNewItemsArrived }
+            , Cmd.none
+            , Sub.none
+            )
+
 
 applyClientSettings : Messages -> Model -> UiSettings -> ( Model, Cmd Msg, Sub Msg )
 applyClientSettings texts model settings =

modules/webapp/src/main/elm/App/View2.elm

@@ -71,7 +71,19 @@ topNavUser auth model =
             , activeStyle = "hover:bg-blue-200 dark:hover:bg-bluegray-800 w-12"
             }
         , headerNavItem True model
-        , div [ class "flex flex-grow justify-end" ]
+        , div [ class "flex flex-grow justify-center" ]
+            [ a
+                [ class S.infoMessageBase
+                , class "my-2 px-1 py-1 rounded-lg inline-block hover:opacity-50"
+                , classList [ ( "hidden", not model.showNewItemsArrived ) ]
+                , href "#"
+                , onClick ToggleShowNewItemsArrived
+                ]
+                [ i [ class "fa fa-exclamation-circle mr-1" ] []
+                , text texts.app.newItemsArrived
+                ]
+            ]
+        , div [ class "flex justify-end" ]
             [ userMenu texts.app auth model
             , dataMenu texts.app auth model
             ]

modules/webapp/src/main/elm/Data/ServerEvent.elm

@@ -0,0 +1,22 @@
+{-
+   Copyright 2020 Eike K. & Contributors
+
+   SPDX-License-Identifier: AGPL-3.0-or-later
+-}
+
+
+module Data.ServerEvent exposing (ServerEvent(..), fromString)
+
+
+type ServerEvent
+    = ItemProcessed
+
+
+fromString : String -> Maybe ServerEvent
+fromString str =
+    case String.toLower str of
+        "item-processed" ->
+            Just ItemProcessed
+
+        _ ->
+            Nothing

modules/webapp/src/main/elm/Main.elm

@@ -93,4 +93,5 @@ subscriptions model =
     Sub.batch
         [ model.subs
         , Ports.receiveUiSettings ReceiveBrowserSettings
+        , Ports.receiveWsMessage ReceiveWsMessage
         ]

modules/webapp/src/main/elm/Messages/App.elm

@@ -23,6 +23,7 @@ type alias Texts =
     , processingQueue : String
     , newInvites : String
     , help : String
+    , newItemsArrived : String
     }
 
 
@@ -38,6 +39,7 @@ gb =
     , processingQueue = "Processing Queue"
     , newInvites = "New Invites"
     , help = "Help"
+    , newItemsArrived = "New items arrived!"
     }
 
 
@@ -53,4 +55,5 @@ de =
     , processingQueue = "Verarbeitung"
     , newInvites = "Neue Einladung"
     , help = "Hilfe (English)"
+    , newItemsArrived = "Neue Dokumente eingetroffen!"
     }

modules/webapp/src/main/elm/Page/Home/Data.elm

@@ -229,6 +229,7 @@ type Msg
     | PublishItemsMsg Comp.PublishItems.Msg
     | TogglePublishCurrentQueryView
     | PublishViewMsg Comp.PublishItems.Msg
+    | RefreshView
 
 
 type SearchType

modules/webapp/src/main/elm/Page/Home/Update.elm

@@ -227,6 +227,22 @@ update mId key flags texts settings msg model =
             else
                 doSearch param nm
 
+        RefreshView ->
+            let
+                param =
+                    { flags = flags
+                    , searchType = model.lastSearchType
+                    , pageSize = settings.itemSearchPageSize
+                    , offset = model.searchOffset
+                    , scroll = False
+                    }
+            in
+            if model.searchInProgress then
+                withSub ( model, Cmd.none )
+
+            else
+                doSearch param model
+
         ToggleSearchMenu ->
             let
                 nextView =

modules/webapp/src/main/elm/Ports.elm

@@ -11,6 +11,7 @@ port module Ports exposing
     , printElement
     , receiveCheckQueryResult
     , receiveUiSettings
+    , receiveWsMessage
     , removeAccount
     , requestUiSettings
     , setAccount
@@ -55,6 +56,15 @@ and calls the print dialog.
 port printElement : String -> Cmd msg
 
 
+{-| Receives messages from the websocket.
+-}
+port receiveWsMessage : (String -> msg) -> Sub msg
+
+
+
+--- Higher level functions based on ports
+
+
 setUiTheme : UiTheme -> Cmd msg
 setUiTheme theme =
     internalSetUiTheme (Data.UiTheme.toString theme)

modules/webapp/src/main/elm/Styles.elm

@@ -63,9 +63,14 @@ warnMessageColors =
     " border-yellow-800 bg-yellow-50 text-yellow-800 dark:border-amber-200 dark:bg-amber-800 dark:text-amber-200 "
 
 
+infoMessageBase : String
+infoMessageBase =
+    " border border-blue-800 bg-blue-100 text-blue-800 dark:border-lightblue-200 dark:bg-lightblue-800 dark:text-lightblue-200 dark:bg-opacity-25 "
+
+
 infoMessage : String
 infoMessage =
-    " border border-blue-800 bg-blue-100 text-blue-800 dark:border-lightblue-200 dark:bg-lightblue-800 dark:text-lightblue-200 dark:bg-opacity-25 px-2 py-2 rounded "
+    infoMessageBase ++ " px-2 py-2 rounded "
 
 
 message : String

modules/webapp/src/main/webjar/docspell.js

@@ -12,9 +12,9 @@ function extend() {
     var result = {};
     for (var i = 0; i < arguments.length; i++) {
         forEachIn(arguments[i],
-            function(obj, key) {
-                result[key] = obj;
-            });
+                  function(obj, key) {
+                      result[key] = obj;
+                  });
     }
     return result;
 }
@@ -41,13 +41,18 @@ elmApp.ports.internalSetUiTheme.subscribe(function(themeName) {
 });
 
 elmApp.ports.setAccount.subscribe(function(authResult) {
-    console.log("Add account from local storage");
+    console.log("Add account to local storage");
     localStorage.setItem("account", JSON.stringify(authResult));
+
+    if (!dsWebSocket) {
+        initWS();
+    }
 });
 
 elmApp.ports.removeAccount.subscribe(function() {
     console.log("Remove account from local storage");
     localStorage.removeItem("account");
+    closeWS();
 });
 
 elmApp.ports.requestUiSettings.subscribe(function(args) {
@@ -135,3 +140,28 @@ elmApp.ports.printElement.subscribe(function(id) {
         }
     }
 });
+
+
+var dsWebSocket = null;
+function closeWS() {
+    if (dsWebSocket) {
+        console.log("Closing websocket connection");
+        dsWebSocket.close(1000, "Done");
+        dsWebSocket = null;
+    }
+}
+function initWS() {
+    closeWS();
+    var protocol = (window.location.protocol === 'https:') ? 'wss:' : 'ws:';
+    var url = protocol + '//' + window.location.host + '/api/v1/sec/ws';
+    console.log("Initialize websocket at " + url);
+    dsWebSocket = new WebSocket(url);
+    dsWebSocket.addEventListener("message", function(event) {
+        if (event.data != "keep-alive" && event.data) {
+            elmApp.ports.receiveWsMessage.send(event.data);
+        }
+    });
+}
+// elmApp.ports.sendWsMessage.subscribe(function(msg) {
+//     socket.send(msg);
+// });