Module: Prosopite

Defined in:
lib/prosopite.rb,
lib/prosopite/version.rb,
lib/prosopite/middleware/rack.rb,
lib/prosopite/middleware/sidekiq.rb

Defined Under Namespace

Modules: Middleware Classes: NPlusOneQueriesError

Constant Summary collapse

DEFAULT_ALLOW_LIST = 
[
  /active_record\/relation.rb.*preload_associations/,
  'active_record/validations/uniqueness'
].freeze
VERSION = 
"1.4.2"

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.allow_stack_paths ⇒ Object

Returns the value of attribute allow_stack_paths.



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# File 'lib/prosopite.rb', line 19

def allow_stack_paths
  @allow_stack_paths
end

.backtrace_cleaner ⇒ Object 



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# File 'lib/prosopite.rb', line 29

def backtrace_cleaner
  @backtrace_cleaner ||= Rails.backtrace_cleaner
end

.custom_logger=(value) ⇒ Object (writeonly)

Sets the attribute custom_logger

Parameters:

  • value —

    the value to set the attribute custom_logger to.



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# File 'lib/prosopite.rb', line 10

def custom_logger=(value)
  @custom_logger = value
end

.enabled=(value) ⇒ Object (writeonly)

Sets the attribute enabled

Parameters:

  • value —

    the value to set the attribute enabled to.



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# File 'lib/prosopite.rb', line 10

def enabled=(value)
  @enabled = value
end

.ignore_pauses=(value) ⇒ Object (writeonly)

Sets the attribute ignore_pauses

Parameters:

  • value —

    the value to set the attribute ignore_pauses to.



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# File 'lib/prosopite.rb', line 10

def ignore_pauses=(value)
  @ignore_pauses = value
end

.ignore_queries ⇒ Object

Returns the value of attribute ignore_queries.



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# File 'lib/prosopite.rb', line 19

def ignore_queries
  @ignore_queries
end

.min_n_queries ⇒ Object

Returns the value of attribute min_n_queries.



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# File 'lib/prosopite.rb', line 19

def min_n_queries
  @min_n_queries
end

.prosopite_logger=(value) ⇒ Object (writeonly)

Sets the attribute prosopite_logger

Parameters:

  • value —

    the value to set the attribute prosopite_logger to.



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# File 'lib/prosopite.rb', line 10

def prosopite_logger=(value)
  @prosopite_logger = value
end

.rails_logger=(value) ⇒ Object (writeonly)

Sets the attribute rails_logger

Parameters:

  • value —

    the value to set the attribute rails_logger to.



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# File 'lib/prosopite.rb', line 10

def rails_logger=(value)
  @rails_logger = value
end

.raise=(value) ⇒ Object (writeonly)

Sets the attribute raise

Parameters:

  • value —

    the value to set the attribute raise to.



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# File 'lib/prosopite.rb', line 10

def raise=(value)
  @raise = value
end

.stderr_logger=(value) ⇒ Object (writeonly)

Sets the attribute stderr_logger

Parameters:

  • value —

    the value to set the attribute stderr_logger to.



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# File 'lib/prosopite.rb', line 10

def stderr_logger=(value)
  @stderr_logger = value
end

Class Method Details

.allow_list=(value) ⇒ Object 



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# File 'lib/prosopite.rb', line 23

def allow_list=(value)
  puts "Prosopite.allow_list= is deprecated. Use Prosopite.allow_stack_paths= instead."

  self.allow_stack_paths = value
end

.create_notifications ⇒ Object 



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# File 'lib/prosopite.rb', line 116

def create_notifications
  tc[:prosopite_notifications] = {}

  tc[:prosopite_query_counter].each do |location_key, count|
    if count >= @min_n_queries
      fingerprints = tc[:prosopite_query_holder][location_key].group_by do |q|
        begin
          fingerprint(q)
        rescue
          raise q
        end
      end

      queries = fingerprints.values.select { |q| q.size >= @min_n_queries }

      next unless queries.any?

      kaller = tc[:prosopite_query_caller][location_key]
      allow_list = (@allow_stack_paths + DEFAULT_ALLOW_LIST)
      is_allowed = kaller.any? { |f| allow_list.any? { |s| f.match?(s) } }

      unless is_allowed
        queries.each do |q|
          tc[:prosopite_notifications][q] = kaller
        end
      end
    end
  end
end

.disabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prosopite.rb', line 39

def disabled?
  !enabled?
end

.enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prosopite.rb', line 33

def enabled?
  @enabled = true if @enabled.nil?

  @enabled
end

.fingerprint(query) ⇒ Object 



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# File 'lib/prosopite.rb', line 146

def fingerprint(query)
  db_adapter = ActiveRecord::Base.connection.adapter_name.downcase
  if db_adapter.include?('mysql') || db_adapter.include?('trilogy')
    mysql_fingerprint(query)
  else
    begin
      require 'pg_query'
    rescue LoadError => e
      msg = "Could not load the 'pg_query' gem. Add `gem 'pg_query'` to your Gemfile"
      raise LoadError, msg, e.backtrace
    end
    PgQuery.fingerprint(query)
  end
end

.finish ⇒ Object 



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# File 'lib/prosopite.rb', line 103

def finish
  return unless scan?

  tc[:prosopite_scan] = false

  create_notifications
  send_notifications if tc[:prosopite_notifications].present?

  tc[:prosopite_query_counter] = nil
  tc[:prosopite_query_holder] = nil
  tc[:prosopite_query_caller] = nil
end

.ignore_query?(sql) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prosopite.rb', line 251

def ignore_query?(sql)
  @ignore_queries ||= []
  @ignore_queries.any? { |q| q === sql }
end

.mysql_fingerprint(query) ⇒ Object

Many thanks to github.com/genkami/fluent-plugin-query-fingerprint/



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# File 'lib/prosopite.rb', line 162

def mysql_fingerprint(query)
  query = query.dup

  return "mysqldump" if query =~ %r#\ASELECT /\*!40001 SQL_NO_CACHE \*/ \* FROM `#
  return "percona-toolkit" if query =~ %r#\*\w+\.\w+:[0-9]/[0-9]\*/#
  if match = /\A\s*(call\s+\S+)\(/i.match(query)
    return match.captures.first.downcase!
  end

  if match = /\A((?:INSERT|REPLACE)(?: IGNORE)?\s+INTO.+?VALUES\s*\(.*?\))\s*,\s*\(/im.match(query)
    query = match.captures.first
  end

  query.gsub!(%r#/\*[^!].*?\*/#m, "")
  query.gsub!(/(?:--|#)[^\r\n]*(?=[\r\n]|\Z)/, "")

  return query if query.gsub!(/\Ause \S+\Z/i, "use ?")

  query.gsub!(/\\["']/, "")
  query.gsub!(/".*?"/m, "?")
  query.gsub!(/'.*?'/m, "?")

  query.gsub!(/\btrue\b|\bfalse\b/i, "?")

  query.gsub!(/[0-9+-][0-9a-f.x+-]*/, "?")
  query.gsub!(/[xb.+-]\?/, "?")

  query.strip!
  query.gsub!(/[ \n\t\r\f]+/, " ")
  query.downcase!

  query.gsub!(/\bnull\b/i, "?")

  query.gsub!(/\b(in|values?)(?:[\s,]*\([\s?,]*\))+/, "\\1(?+)")

  query.gsub!(/(?<!\w)field\s*\(\s*(\S+)\s*,\s*(\?+)(?:\s*,\s*\?+)*\)/, 'field(\1, \2+)')

  query.gsub!(/\b(select\s.*?)(?:(\sunion(?:\sall)?)\s\1)+/, "\\1 /*repeat\\2*/")

  query.gsub!(/\blimit \?(?:, ?\?| offset \?)/, "limit ?")

  if query =~ /\border by/
    query.gsub!(/\G(.+?)\s+asc/, "\\1")
  end

  query
end

.pause ⇒ Object 



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# File 'lib/prosopite.rb', line 76

def pause
  if @ignore_pauses
    return block_given? ? yield : nil
  end

  if block_given?
    begin
      previous = tc[:prosopite_scan]
      tc[:prosopite_scan] = false
      yield
    ensure
      tc[:prosopite_scan] = previous
    end
  else
    tc[:prosopite_scan] = false
  end
end

.red(str) ⇒ Object 



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# File 'lib/prosopite.rb', line 247

def red(str)
  str.split("\n").map { |line| "\e[91m#{line}\e[0m" }.join("\n")
end

.resume ⇒ Object 



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# File 'lib/prosopite.rb', line 94

def resume
  tc[:prosopite_scan] = true
end

.scan ⇒ Object 



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# File 'lib/prosopite.rb', line 43

def scan
  tc[:prosopite_scan] ||= false
  if scan? || disabled?
    return block_given? ? yield : nil
  end

  subscribe

  tc[:prosopite_query_counter] = Hash.new(0)
  tc[:prosopite_query_holder] = Hash.new { |h, k| h[k] = [] }
  tc[:prosopite_query_caller] = {}

  @allow_stack_paths ||= []
  @ignore_pauses ||= false
  @min_n_queries ||= 2

  tc[:prosopite_scan] = true

  if block_given?
    begin
      block_result = yield
      finish
      block_result
    ensure
      tc[:prosopite_scan] = false
    end
  end
end

.scan? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prosopite.rb', line 98

def scan?
  !!(tc[:prosopite_scan] && tc[:prosopite_query_counter] &&
     tc[:prosopite_query_holder] && tc[:prosopite_query_caller])
end

.send_notifications ⇒ Object

Raises:



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# File 'lib/prosopite.rb', line 210

def send_notifications
  @custom_logger ||= false
  @rails_logger ||= false
  @stderr_logger ||= false
  @prosopite_logger ||= false
  @raise ||= false

  notifications_str = ''

  tc[:prosopite_notifications].each do |queries, kaller|
    notifications_str << "N+1 queries detected:\n"

    queries.each { |q| notifications_str << "  #{q}\n" }

    notifications_str << "Call stack:\n"
    kaller = backtrace_cleaner.clean(kaller)
    kaller.each do |f|
      notifications_str << "  #{f}\n"
    end

    notifications_str << "\n"
  end

  @custom_logger.warn(notifications_str) if @custom_logger

  Rails.logger.warn(red(notifications_str)) if @rails_logger
  $stderr.puts(red(notifications_str)) if @stderr_logger

  if @prosopite_logger
    File.open(File.join(Rails.root, 'log', 'prosopite.log'), 'a') do |f|
      f.puts(notifications_str)
    end
  end

  raise NPlusOneQueriesError.new(notifications_str) if @raise
end

.subscribe ⇒ Object 



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# File 'lib/prosopite.rb', line 256

def subscribe
  @subscribed ||= false
  return if @subscribed

  ActiveSupport::Notifications.subscribe 'sql.active_record' do |_, _, _, _, data|
    sql, name = data[:sql], data[:name]

    if scan? && name != "SCHEMA" && sql.include?('SELECT') && data[:cached].nil? && !ignore_query?(sql)
      query_caller = caller
      location_key = Digest::SHA256.hexdigest(query_caller.join)

      tc[:prosopite_query_counter][location_key] += 1
      tc[:prosopite_query_holder][location_key] << sql

      if tc[:prosopite_query_counter][location_key] > 1
        tc[:prosopite_query_caller][location_key] = query_caller.dup
      end
    end
  end

  @subscribed = true
end

.tc ⇒ Object 



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# File 'lib/prosopite.rb', line 72

def tc
  Thread.current
end