mysql monitoring example using cucumer

mysql.feature

Feature: localhost
  To make sure the rest of the system is in order
  Our database server should not be overloaded

  Scenario: check running processes count
    Given I have a MySQL server on localhost
    And I use the username root
    Then it should have less than 10 processes

  Scenario: check queries per second
    Given I have a MySQL server on localhost
    And I use the username root
    Then it should have less than 200 select queries per second
    Then it should have less than 300 queries per second
    Then it should have less than 5 slow queries pers second
    Then it should have at least 10 queries per second

mysql.rb

require 'rubygems'
require 'mysql'

# simple functions to get at the number of currently running processes
# on a mysql server
def get_process_count()
  my = Mysql.connect(@host, @username, @password)
  results = my.query('SHOW PROCESSLIST;')
  @processes = results.size
end

# lots of helper funtions to retrieve information from the GLOBAL STATUS
# table where MySQL stores information about it's current state
def get_connection_count()
  my = Mysql.connect(@host, @username, @password)
  results = my.query("SHOW GLOBAL STATUS where Variable_name = 'Connections';")
  @connections = results.size
end

def get_threads_connected_count()
  my = Mysql.connect(@host, @username, @password)
  results = my.query("SHOW GLOBAL STATUS where Variable_name = 'Threads_connected';")
  @threads_connected = results.size
end

def get_threads_running_count()
  my = Mysql.connect(@host, @username, @password)
  results = my.query("SHOW GLOBAL STATUS where Variable_name = 'Threads_running';")
  @threads_running = results.size
end

def get_cached_queries_count()
  my = Mysql.connect(@host, @username, @password)
  results = my.query("SHOW GLOBAL STATUS where Variable_name = 'Qcache_queries_in_cache';")
  @cached_queries = results.size
end

def get_queries_per_second()
  my = Mysql.connect(@host, @username, @password)
  query = "SHOW GLOBAL STATUS where Variable_name = 'Com_update' or Variable_name = 'Com_select' or Variable_name = 'Com_delete' or Variable_name = 'Com_insert';"
  results = my.query(query)
  starting = results.fetch_row[1].to_i + results.fetch_row[1].to_i + results.fetch_row[1].to_i + results.fetch_row[1].to_i
  sleep 10
  results = my.query(query)
  ending = results.fetch_row[1].to_i + results.fetch_row[1].to_i + results.fetch_row[1].to_i + results.fetch_row[1].to_i
  # now calculate the difference and divide by 10
  (ending.to_i-starting.to_i)/10
end

def get_results_per_second(query)
  my = Mysql.connect(@host, @username, @password)
  results = my.query(query)
  starting = results.fetch_row[1]
  sleep 10
  results = my.query(query)
  ending = results.fetch_row[1]
  # now calculate the difference and divide by 10
  (ending.to_i-starting.to_i)/10
end

def get_updates_per_second()
  @updates_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Com_update';")
end

def get_selects_per_second()
  @selects_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Com_select';")
end

def get_deletes_per_second()
  @deletes_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Com_delete';")
end

def get_inserts_per_second()
  @inserts_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Com_insert';")
end

def get_cache_hits_per_second()
  @cache_hits_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Qcache_hots';")
end

def get_questions_per_second()
  @questions_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Questions';")
end

def get_slow_queries_per_second()
  @slow_queries_per_second = get_results_per_second("SHOW GLOBAL STATUS where Variable_name = 'Slow_queries';")
end

# specify the username and password if we're testing a default local install
Before do
  @username = 'root'
  @password = ''
end

# Step definitions for testing the state of the MySQL server
Given /I have a MySQL server on (.+)$/ do |host|
  @host = host
end

And /I use the username (.+)$/ do |username|
  @username = username
end

And /I use the password (.+)$/ do |password|
  @password = password
end

Then /it should have less than (\d+) processes$/ do |processes|
  get_process_count()
  @processes.should < processes.to_i
end

Then /it should have less than (\d+) connections$/ do |connections|
  get_connection_count()
  @connections.should < connections.to_i
end

Then /it should have less than (\d+) threads running$/ do |threads|
  get_threads_running_count()
  @threads_running.should < threads.to_i
end

Then /it should have less than (\d+) threads connected$/ do |threads|
  get_threads_connected_count()
  @threads_connected.should < threads.to_i
end

Then /it should have at least (\d+) queries cached$/ do |cached_queries|
  get_cached_queries_count()
  @cached_queries.should >= cached_queries.to_i
end

Then /it should have less than (\d+) update queries per second$/ do |queries|
  get_updates_per_second()
  @updates_per_second.should < queries.to_i
end

Then /it should have less than (\d+) insert queries per second$/ do |queries|
  get_inserts_per_second()
  @inserts_per_second.should < queries.to_i
end

Then /it should have less than (\d+) delete queries per second$/ do |queries|
  get_deletes_per_second()
  @deletes_per_second.should < queries.to_i
end

Then /it should have less than (\d+) selects queries per second$/ do |queries|
  get_selects_per_second()
  @selects_per_second.should < queries.to_i
end

Then /it should have less than (\d+) queries per second$/ do |queries|
  get_queries_per_second()
  @queries_per_second.should < queries.to_i
end

Then /it should have less than (\d+) cache hits per second$/ do |queries|
  get_cache_hits_per_second()
  @cache_hits_per_second.should < queries.to_i
end

Then /it should have less than (\d+) slow queries per second$/ do |queries|
  get_slow_queries_per_second()
  @slow_queries_per_second.should < queries.to_i
end

Then /it should have less than (\d+) questions per second$/ do |queries|
  get_questions_per_second()
  @questions_per_second.should < queries.to_i
end

Then /it should have at least (\d+) processes$/ do |processes|
  get_process_count()
  @processes.should >= processes.to_i
end

Then /it should have at least (\d+) connections$/ do |connections|
  get_connection_count()
  @connections.should >= connections.to_i
end

Then /it should have at least (\d+) threads running$/ do |threads|
  get_threads_running_count()
  @threads_running.should >= threads.to_i
end

Then /it should have at least (\d+) threads connected$/ do |threads|
  get_threads_connected_count()
  @threads_connected.should >= threads.to_i
end

Then /it should have at least (\d+) queries cached$/ do |cached_queries|
  get_cached_queries_count()
  @cached_queries.should >= cached_queries.to_i
end

Then /it should have at least (\d+) update queries per second$/ do |queries|
  get_updates_per_second()
  @updates_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) insert queries per second$/ do |queries|
  get_inserts_per_second()
  @inserts_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) delete queries per second$/ do |queries|
  get_deletes_per_second()
  @deletes_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) selects queries per second$/ do |queries|
  get_selects_per_second()
  @selects_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) queries per second$/ do |queries|
  get_queries_per_second()
  @queries_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) cache hits per second$/ do |queries|
  get_cache_hits_per_second()
  @cache_hits_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) slow queries per second$/ do |queries|
  get_slow_queries_per_second()
  @slow_queries_per_second.should >= queries.to_i
end

Then /it should have at least (\d+) questions per second$/ do |queries|
  get_questions_per_second()
  @questions_per_second.should >= queries.to_i
end