setting up zipkin locally with a rails app

[shai rosenfeld]

Hey, I'm trying to get a setup going with a normal rails app. I've got the zipkin repository cloned, I ran the setup stuff:

./bin/web

./bin/query

./bin/collector

Now I'm trying to add it to my rails app, I add it as the middleware closest to the run rack statement (the middleware breaks at the same place if it's not the closest, which should be fixed). But anyway now I'm getting undefined method zipkin_tracer for the Rails.application as per:

!! Unexpected error while processing request: undefined method `zipkin_tracer' for #<Rails::Application::Configuration:0x007fd22a190790>

For: 

https://github.com/twitter/zipkin/blob/master/zipkin-gems/zipkin-tracer/lib/zipkin-tracer.rb#L27

config = app.config.zipkin_tracer

How do I go about adding the right configuration for my rails app? Is there a specific instance/class I should be using? Implementing a specific interface?

I'm on the IRC channel as shaiguitar as well. 

TIA. 

[shai rosenfeld]

Bump, filed this over the weekend. What should app.config.zipkin_tracer be implementing?

[shai rosenfeld]

Essentially I managed to add this:

class ZipkinTracer

  def initialize

    @random_thing = {}

  end

  def [](arg)

    @random_thing[arg]

  end

end

class Application < Rails::Application

  config.zipkin_tracer = ZipkinTracer.new

end

And things don't bomb out, so clearly that's the outer interface, but how do I actually get data into the local zipkin stuff I have running? What is that zipkin_tracer supposed to do?

[Brian Degenhardt]

Sorry, as discussed on irc, my ruby knowledge is quite thin.  The tracer is supposed to log stuff to scribe and then be forewarded to zipkin-collector:

http://twitter.github.io/zipkin/architecture.html

If you're not running scribe you can point your traced code directly at the collector's host/port.

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[shai rosenfeld]

Just for doc's sake in this post:

+    zipkin_tracer_info = HashWithIndifferentAccess.new

+    # no scribe...so straight to collector! if you have scribe, it should be port 1463 instead?

+    zipkin_tracer_info.merge!({service_name: 'your_app', service_port: 9410, sample_rate: 1})

+    config.zipkin_tracer = zipkin_tracer_info

[shai rosenfeld]

If you don't use scribe and want to forward straight to the collector, use this configuration: 

config.zipkin_tracer = {service_name: 'awsm', service_port: 9410, sample_rate: 1, scribe_server: "127.0.0.1:9410"}