Class: RubyZipkin::RackHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/rubyzipkin.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, service_name, scribe_server, scribe_port, uri_filter_list = [], http_header_filter_list = [], uri_sample_filter_list = {}, sampling_rate = 0.0001, scribe_max_buffer = 50) ⇒ RackHandler

Returns a new instance of RackHandler.



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# File 'lib/rubyzipkin.rb', line 18

def initialize(app, service_name, scribe_server, scribe_port, uri_filter_list = [], http_header_filter_list = [], uri_sample_filter_list = {}, sampling_rate = 0.0001, scribe_max_buffer = 50 )
  @app = app
  @lock = Mutex.new

  @service_name = service_name
  @scribe_port = scribe_port
  @sample_rate = sampling_rate
  @uri_filter_list = uri_filter_list
  @http_header_filter_list = http_header_filter_list
  @uri_sample_filter_list = uri_sample_filter_list
  @scribe = Scribe.new("#{scribe_server}:#{scribe_port}")
  ::Trace.tracer = ::Trace::ZipkinTracer.new(Scriber.new(@scribe), scribe_max_buffer)
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rubyzipkin.rb', line 32

def call(env)
  begin
    ::Trace.default_endpoint = ::Trace.default_endpoint.with_service_name(@service_name + "_#{normalized_uri(env['PATH_INFO'])}")
    set_sample_rate(env)
    trace_id = get_or_create_trace_id(env)
    env[ZipkinTraceHeader::PARENT_SPAN_ID] = @spanid
    env[ZipkinTraceHeader::TRACE_ID] = @tid

  rescue => e
    $stderr.puts "ZIPKIN [ERR] #{e}"
  end

  begin
    @status, @headers, @response = @app.call(env)
    tracing_filter(trace_id, env, @headers)
  rescue => e
    # we want to do the call even if zipkin fails
    $stderr.puts "ZIPKIN [ERR] #{e} \n\n\n #{e.backtrace}"
  end
  [@status, @headers, @response]
end