Driver is nil for ephemeral publisher

[maulin]

I get the following error when I try to publish an ephemeral.

 ~/code/crowdtap (main) > SlackNotification.create({:room=>'the-lab', :message => 'test'})
RuntimeError: #<Class:Promiscuous::Backend>#publish delegated to driver.publish, but driver is nil: Promiscuous::Backend
from /opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/backend.rb:54:in `rescue in publish'

This is what the full stack trace looks like

=> [
    [ 0] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/backend.rb:54:in `rescue in publish'",
    [ 1] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/backend.rb:51:in `publish'",
    [ 2] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/operation/base.rb:135:in `block in publish_payloads'",
    [ 3] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/operation/base.rb:127:in `each'",
    [ 4] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/operation/base.rb:127:in `publish_payloads'",
    [ 5] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/operation/ephemeral.rb:13:in `execute_instrumented'",
    [ 6] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/operation/base.rb:31:in `execute'",
    [ 7] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/model/ephemeral.rb:44:in `save_operation'",
    [ 8] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/model/ephemeral.rb:36:in `save'",
    [ 9] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/model/ephemeral.rb:72:in `block in create'",
    [10] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/model/ephemeral.rb:72:in `tap'",
    [11] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/bundler/gems/promiscuous-8851d13ed1b9/lib/promiscuous/publisher/model/ephemeral.rb:72:in `create'",
    [12] "(pry):10:in `<main>'",
    [13] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:328:in `eval'",
    [14] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:328:in `evaluate_ruby'",
    [15] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:278:in `re'",
    [16] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:254:in `rep'",
    [17] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:234:in `block (3 levels) in repl'",
    [18] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:232:in `loop'",
    [19] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:232:in `block (2 levels) in repl'",
    [20] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:231:in `catch'",
    [21] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:231:in `block in repl'",
    [22] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:230:in `catch'",
    [23] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_instance.rb:230:in `repl'",
    [24] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-0.9.12.6/lib/pry/pry_class.rb:169:in `start'",
    [25] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/pry-nav-0.2.3/lib/pry-nav/pry_ext.rb:17:in `start_with_pry_nav'",
    [26] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.18/lib/rails/commands/console.rb:47:in `start'",
    [27] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.18/lib/rails/commands/console.rb:8:in `start'",
    [28] "/opt/rubies/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.18/lib/rails/commands.rb:41:in `<top (required)>'",
    [29] "script/rails:6:in `require'",
    [30] "script/rails:6:in `<main>'"
]

It seems like the connection to rabbit is not being made. But if I publish a regular publisher model first and then publish the ephemeral, it works fine. This is on the kafka branch

[kareemk]

I'll get a fix out soon for this in the meantime try Promiscuous.ensure_connected before you publish.