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# frozen_string_literal: true
module Jaeger
module Samplers
# Probabilistic sampler
#
# Sample a portion of traces using trace_id as the random decision
class Probabilistic
attr_reader :rate
def initialize(rate: 0.001)
update(rate: rate)
end
def update(rate:)
if rate < 0.0 || rate > 1.0
raise "Sampling rate must be between 0.0 and 1.0, got #{rate.inspect}"
end
new_boundary = TraceId::TRACE_ID_UPPER_BOUND * rate
return false if @boundary == new_boundary
@rate = rate
@boundary = TraceId::TRACE_ID_UPPER_BOUND * rate
@tags = {
'sampler.type' => 'probabilistic',
'sampler.param' => rate
}
true
end
def sample(opts)
trace_id = opts.fetch(:trace_id)
[@boundary >= trace_id, @tags]
end
end
end
end
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