mikhailov

ActiveSupport::Notifications.subscribe('process_action.action_controller') do |*args|
  event   = ActiveSupport::Notifications::Event.new(*args)
  span    = Datadog.tracer.active_span
  payload = event.payload

  if span && payload.key?(:db_runtime)
    db_runtime = payload[:db_runtime].to_f.round(3)
    span.set_tag('database.sql_time', db_runtime)
  end
end

mikhailov

#!/bin/bash
set -ex

# Inject APM Trace ID (part of SQL query comment) to a Log event
# https://docs.datadoghq.com/tracing/advanced/connect_logs_and_traces/?tab=ruby
# Input: {"command": "Query", "current_statement": "SELECT ... /* 4572859165692197980 */"}
# Output: {"process_list": {"current_statement": "SELECT ... /* 4572859165692197980 */"}, "dd": {"trace_id": 4572859165692197980}}
function inject_trace_id() {
  trace_id=$(echo "$1" |grep -Eo '/\* [0-9]{16,20} \*/' | awk '{print $2}')

mikhailov

log_format    json '{'
  '"http":{'
    '"method":"$request_method",'
    '"request_id":"$request_id",'
    '"status_code":$status,'
    '"content_type":"$content_type",'
    '"url":"$request_uri",'
    '"url_details":{'
      '"path":"$uri",'
      '"scheme":"$scheme",'

mikhailov

upstream upstream_close_server_keepalive_timeout_0 {
  server upstream:10443;
}

upstream upstream_keepalive_server_keepalive_timeout_0 {
  server upstream:11443;
  keepalive 64;
}

upstream upstream_close_server_keepalive_timeout_300 {

mikhailov

module ActionDispatch
  class Reloader

    def call(env)
      if env['PATH_INFO'].include?(Rails.application.config.assets.prefix)
        @app.call(env)
      else
        @validated = @condition.call
        prepare!

mikhailov

class Object

  class UnitTestError < StandardError; end

  def describe(description, &block)
    if Object.class_eval(&block)
      print '.'
    else
      puts 'FAIL ' + description
      raise UnitTestError

mikhailov

class ReverseSentence

  def initialize(string)
    @array, @array_reversed = string.split(" "), []
  end

  def process    
    @array_reversed << @array.pop while @array.any?
    @array_reversed.join(" ")
  end

mikhailov

class FizzBuzz
  def initialize(array)
    @array     = array
    @new_array = []
  end

  def process
    @array.each do |e|
      value = \
      if e % 3 == 0 && e % 5 == 0

mikhailov

class DecimalMark

  def initialize(data)
    @array     = data.split("")
    @new_array = []
  end

  def process
    i = 0
    loop do

mikhailov

class ValidParentheses
  SYMBOLS = {"(" => ")", "[" => "]", "{" => "}"}

  def initialize(array)
    @array = array.split("")
    @stack = []
  end

  def process
    @array.each do |i|