Reviews of the code/contributions are very welcome (particularly with testing!), since I don't really know Ruby.

Logstash Slack Output Plugin

Uses Slack incoming webhooks API to send log events to Slack.

Usage:

input {
    ...
}

filters {
    ...
}

output {
    ...
    slack {
        url => <YOUR SLACK WEBHOOK URL HERE>
        channel => [channel-name - optional]
        username => [slack username - optional]
        icon_emoji => [emoji, something like ":simple_smile:" - optional]
        icon_url => [icon url, would be overriden by icon_emoji - optional]
        format => [default is "%{message}", but used to format the text - optional]
        attachments => [an array of attachment maps as specified by the slack API - optional; if there is an "attachments" field in the event map and it is valid, it will override what is configured here, even if it's empty]
    }
}

Changelog:

• v0.1.4:
  • Drops support for JDK6 (#15)
  • Fix gemspec requirements to support newer versions of logstash core (#14)
• v0.1.3:
  • No change - bug in releasing
• v0.1.2:
  • Added support for attachments
• v0.1.1:
  • Added variable expansion to usernames and channel names (#6)
  • Fixed bug when reporting malformed requests (#3)
  • Test fixes since newer versions of logstash-core expects the values in the add_field hash to not be integers.
• v0.1.0:
  • initial version containing basic slack functionality

Installation on Logstash >= 1.5

In the logstash directory, run: bin/plugin install logstash-output-slack, which will download and install the public gem.

To build your own gem and install:

1. git clone <thisrepo>

2. bundle install

3. gem build logstash-output-slack.gemspec

4. cd <path to logstash>

5. logstash>1.5.0: bin/plugin install <path-to-your-built-gem>

   On logstash==1.5.0, due to this bug, installing from a local gem doesn't work. You will need to:

   1. Make sure that the logstash-core gem you've installed matches the exact beta 1.5 logstash version you are running.
   2. modify the logstash Gemfile to include the line gem "logstash-output-slack", :path => <path_to_the_directory_your_gem_is_in>
   3. bin/plugin install --no-verify

Verify that the plugin installed correctly

bin/plugin list | grep logstash-output-slack

Test that it works:

bin/logstash -e '
input { stdin {} }
output { slack { <your slack config here> }}'

And type some text in. The same text should appear in the channel it's configured to go in.

Installation on Logstash < 1.5

Gem-installing this plugin would only work on Logstash 1.5. For Logstash < 1.5, you could just rename lib in this repo to logstash, and then run Logstash with --pluginpath <path_to_this_repo>.

See the flags documentation for Logstash 1.4.