Class: Jaeger::Extractors::TraceContextRackCodec

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

Constant Summary collapse

VERSION_PATTERN =

Internal regex used to identify the TraceContext version

/^([0-9a-fA-F]{2})-(.+)$/.freeze
HEADER_V0_PATTERN =

Internal regex used to parse fields in version 0

/^([0-9a-fA-F]{32})-([0-9a-fA-F]{16})(-([0-9a-fA-F]{2}))?$/.freeze

Class Method Summary collapse

Class Method Details

.extract(carrier) ⇒ Object 



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# File 'lib/jaeger/extractors.rb', line 137

def self.extract(carrier)
  header_value = carrier['HTTP_TRACEPARENT']

  version_match = VERSION_PATTERN.match(header_value)
  return nil unless version_match

  # We currently only support version 0
  return nil if version_match[1].to_i(16) != 0

  match = HEADER_V0_PATTERN.match(version_match[2])
  return nil unless match

  trace_id = TraceId.base16_hex_id_to_uint128(match[1])
  span_id = TraceId.base16_hex_id_to_uint64(match[2])
  flags = TraceId.base16_hex_id_to_uint64(match[4])
  return nil if trace_id.zero? || span_id.zero?

  SpanContext.new(trace_id: trace_id, span_id: span_id, flags: flags)
end