Class: RubyZipkin::RackHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby-zipkin.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, service_name, scribe_server, scribe_port, uri_filter_list = [], http_header_filter_list = [], scribe_max_buffer = 10, uri_sample_filter_list = {}, sampling_rate = 0.01) ⇒ RackHandler

Returns a new instance of RackHandler.



15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
 
# File 'lib/ruby-zipkin.rb', line 15

def initialize(app, service_name, scribe_server, scribe_port, uri_filter_list = [], http_header_filter_list = [], scribe_max_buffer = 10, uri_sample_filter_list = {} , sampling_rate = 0.01)
  @app = app
  @lock = Mutex.new

  puts "sampling rate = #{sampling_rate}"
  puts "uri_sample_filter_list = #{uri_sample_filter_list}"

  @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
  @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 



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/ruby-zipkin.rb', line 31

def call(env)
  begin
    ::Trace.default_endpoint = ::Trace.default_endpoint.with_service_name(@service_name + "_#{normalized_uri(env['PATH_INFO'])}")
    ::Trace.sample_rate = @sampling_rate
    env[ZipkinTraceHeader::PARENT_SPAN_ID] = @spanid
    env[ZipkinTraceHeader::TRACE_ID] = @tid
    @status, @headers, @response = @app.call(env)
    tracing_filter(get_or_create_trace_id2(env), env, @headers)
  rescue => e
    #Tracing errors shouldn't block a request.
    puts "Zipkin error: #{e} \n #{e.backtrace}"
    raise e
  end
  [@status, @headers, @response]
end