class Protobuf::Opentracing::RequestDecoder

Attributes

app[R]
env[R]

Public Class Methods

new(app) click to toggle source
# File lib/protobuf/opentracing/request_decoder.rb, line 6
def initialize(app)
  @app = app
end

Public Instance Methods

call(env) click to toggle source
# File lib/protobuf/opentracing/request_decoder.rb, line 10
def call(env)
  operation = "RPC #{env.service_name}##{env.method_name}"
  headers = request_headers(env)
  parent = ::OpenTracing.extract(::OpenTracing::FORMAT_TEXT_MAP, headers)
  options = {}
  options[:child_of] = parent unless parent.nil?
  options[:tags] = {
    "span.kind" => "server",
    "component" => "Protobuf",
  }
  result = nil

  ::OpenTracing.start_active_span(operation, options) do
    result = app.call(env)
  end

  result
end
request_headers(env) click to toggle source
# File lib/protobuf/opentracing/request_decoder.rb, line 29
def request_headers(env)
  return nil if env.request_wrapper.nil?
  env.request_wrapper.headers.reduce({}) do |ctx, header|
    ctx[header.key] = header.value
    ctx
  end
end