dvmlls / slakka-bot

Slack chat bot built with akka.

Version Matrix


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Slack chat bot built with akka.



The virtual machine the bot runs on, and the SDK necessary to target it.

The Java 8 SDK: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

$ java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)

To change your default java on OSX: http://stackoverflow.com/questions/21964709/how-to-set-or-change-the-default-java-jdk-version-on-os-x


Simple Build Tool, an interactive compilation environment: http://www.scala-sbt.org/0.13/docs/Setup.html


$ brew install sbt

I'm using version 0.13.9:

$ sbt 'inspect sbtVersion'
[info] Set current project to slakka-bot (in build file:/Users/dmills/src/slakka-bot/)
[info] Setting: java.lang.String = 0.13.9


IntelliJ 15 Community: https://www.jetbrains.com/idea/download/

When it starts up, install the scala plugin:

  • Configure --> Plugins
  • Install JetBrains Plugin...
  • Install the scala plugin

Get a Slack Token

Go to https://my.slack.com/services/new/bot to register your bot. If you have multiple slack accounts, you can use https://[TEAM].slack.com/services/new/bot instead.

Call it whatever you want, and save your token somewhere - you'll pass it on every API call you make.

You can review your tokens here: https://api.slack.com/web#authentication

Run a Basic Bot

I added some config to tell the bot to log to stderr instead of stdout, allowing me to fiddle with it from the command line.

I'm going to use two terminals: one to interact with the bot, and the other to watch the logs.

In one terminal:

slakka-bot $ export SLACK_TOKEN="[your slack token]"
slakka-bot $ sbt console 2>>~/bot.log
[info] Set current project to slakka-bot (in build file:/Users/dmills/src/slakka-bot/)
[info] Starting scala interpreter...
Welcome to Scala version 2.11.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_60).
Type in expressions to have them evaluated.
Type :help for more information.


Now load a sample bot:

scala> :load EchoBot.scala
Loading EchoBot.scala...
import java.net.URI
import java.util.concurrent.TimeUnit
import akka.actor._

In another terminal:

$ tail -f ~/bot.log
2016-02-10 10:23:21:699 [default-akka.actor.default-dispatcher-3] INFO akka.event.slf4j.Slf4jLogger - Slf4jLogger started
2016-02-10 10:23:21:710 [default-akka.actor.default-dispatcher-3] DEBUG akka.event.EventStream - logger log1-Slf4jLogger started
2016-02-10 10:23:21:711 [default-akka.actor.default-dispatcher-3] DEBUG akka.actor.LocalActorRefProvider$SystemGuardian - now supervising Actor[akka://default/system/UnhandledMessageForwarder#654532009]
2016-02-10 10:23:21:711 [default-akka.actor.default-dispatcher-3] DEBUG akka.event.EventStream - Default Loggers started

Send someone a direct message:

scala> kernel ! Chat(IM("dave"), "your face")


When they reply, it'll show up in the logs:

unhandled message from Actor[akka://default/user/kernel/slack#828626119]: MessageReceived(D0K3XHE3Y,U06DF12SU,no YOUR face)

Chat in a channel:

scala> kernel ! Chat(Channel("general"), "your face")

To shut down your bot cleanly, terminate the actor system first, shutting down all the background threads:

scala> system.shutdown(); sys.exit()
[success] Total time: 208 s, completed Jan 29, 2016 11:22:29 AM

Releasing a new version


Publish to Sonatype staging (publishSigned) and release to Maven Central (sonatypeRelease):

$ sbt publishSigned && sbt sonatypeRelease

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