Method: ZipkinQuery::Client.get_query_service

Defined in:
lib/zipkin-query.rb

.get_query_service(zk_host, zk_port, opts = {}) ⇒ Object 



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# File 'lib/zipkin-query.rb', line 75

def self.get_query_service(zk_host, zk_port, opts={})
  # Takes either:
  # - ZooKeeper config options that map to a Zipkin Query server set OR
  # - Direct host/port of a Query daemon

  if opts[:skip_zookeeper]
    return [ opts[:zipkin_query_host], opts[:zipkin_query_port] ]
  end

  node_path = opts[:node_path] || NODE_PATH

  # TODO: throw error if it fails
  zk = Zookeeper.new("#{zk_host}:#{zk_port}")

  begin
    # TODO: handle errors here
    children = zk.get_children(:path => node_path)
    node_key = children[:children][0]

    # TODO: throw errors
    node = zk.get(:path => "#{node_path}/#{node_key}")
  ensure
    zk.close() if zk
  end

  # Deserialize the result
  d = Thrift::Deserializer.new
  si = d.deserialize(Twitter::Thrift::ServiceInstance.new, node[:data])

  # Return the host and port
  [si.serviceEndpoint.host, si.serviceEndpoint.port]
end