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# frozen_string_literal: true
module WaterDrop
module Instrumentation
# Namespace for handlers of callbacks emitted by the kafka client lib
module Callbacks
# Statistics callback handler
# @note We decorate the statistics with our own decorator because some of the metrics from
# rdkafka are absolute. For example number of sent messages increases not in reference to
# previous statistics emit but from the beginning of the process. We decorate it with diff
# of all the numeric values against the data from the previous callback emit
class Statistics
# @param producer_id [String] id of the current producer
# @param client_name [String] rdkafka client name
# @param monitor [WaterDrop::Instrumentation::Monitor] monitor we are using
def initialize(producer_id, client_name, monitor)
@producer_id = producer_id
@client_name = client_name
@monitor = monitor
@statistics_decorator = StatisticsDecorator.new
end
# Emits decorated statistics to the monitor
# @param statistics [Hash] rdkafka statistics
def call(statistics)
# Emit only statistics related to our client
# rdkafka does not have per-instance statistics hook, thus we need to make sure that we
# emit only stats that are related to current producer. Otherwise we would emit all of
# all the time.
return unless @client_name == statistics['name']
@monitor.instrument(
'statistics.emitted',
producer_id: @producer_id,
statistics: @statistics_decorator.call(statistics)
)
end
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems