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Contents
module Datadog
module Sampling
# Checks if a span conforms to a matching criteria.
class Matcher
# Returns `true` if the span should conforms to this rule, `false` otherwise
#
# @abstract
# @param [Span] span
# @return [Boolean]
def match?(span)
raise NotImplementedError
end
end
# A \Matcher that supports matching a span by
# operation name and/or service name.
class SimpleMatcher < Matcher
# Returns `true` for case equality (===) with any object
MATCH_ALL = Class.new do
# DEV: A class that implements `#===` is ~20% faster than
# DEV: a `Proc` that always returns `true`.
def ===(other)
true
end
end.new
attr_reader :name, :service
# @param name [String,Regexp,Proc] Matcher for case equality (===) with the span name, defaults to always match
# @param service [String,Regexp,Proc] Matcher for case equality (===) with the service name, defaults to always match
def initialize(name: MATCH_ALL, service: MATCH_ALL)
@name = name
@service = service
end
def match?(span)
name === span.name && service === span.service
end
end
# A \Matcher that allows for arbitrary span matching
# based on the return value of a provided block.
class ProcMatcher < Matcher
attr_reader :block
# @yield [name, service] Provides span name and service to the block
# @yieldreturn [Boolean] Whether the span conforms to this matcher
def initialize(&block)
@block = block
end
def match?(span)
block.call(span.name, span.service)
end
end
end
end
Version data entries
31 entries across 31 versions & 2 rubygems