87 lines
2.4 KiB
Ruby
87 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module PerformanceBar
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# This class fetches Peek stats stored in redis and logs them in a
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# structured log (so these can be then analyzed in Kibana)
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class Stats
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IGNORED_BACKTRACE_LOCATIONS = %w[
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ee/lib/ee/peek
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lib/peek
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lib/gitlab/database
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].freeze
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def initialize(redis)
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@redis = redis
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end
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def process(id)
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data = request(id)
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return unless data
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log_sql_queries(id, data)
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rescue => err
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logger.error(message: "failed to process request id #{id}: #{err.message}")
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end
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private
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def request(id)
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# Peek gem stores request data under peek:requests:request_id key
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json_data = @redis.get("peek:requests:#{id}")
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Gitlab::Json.parse(json_data)
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end
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def log_sql_queries(id, data)
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queries_by_location(data).each do |location, queries|
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next unless location
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duration = queries.sum { |query| query['duration'].to_f }
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log_info = {
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method_path: "#{location[:filename]}:#{location[:method]}",
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filename: location[:filename],
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type: :sql,
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request_id: id,
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count: queries.count,
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duration_ms: duration
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}
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logger.info(log_info)
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end
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end
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def queries_by_location(data)
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return [] unless queries = data.dig('data', 'active-record', 'details')
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queries.group_by do |query|
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parse_backtrace(query['backtrace'])
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end
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end
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def parse_backtrace(backtrace)
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return unless backtrace_row = find_caller(backtrace)
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return unless match = /(?<filename>.*):(?<filenum>\d+):in `(?<method>.*)'/.match(backtrace_row)
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{
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filename: match[:filename],
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# filenum may change quite frequently with every change in the file,
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# because the intention is to aggregate these queries, we group
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# them rather by method name which should not change so frequently
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# filenum: match[:filenum].to_i,
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method: match[:method]
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}
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end
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def find_caller(backtrace)
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backtrace.find do |line|
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!line.start_with?(*IGNORED_BACKTRACE_LOCATIONS)
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end
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end
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def logger
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@logger ||= Gitlab::PerformanceBar::Logger.build
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end
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end
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end
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end
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