Class: Mysqlaudit::Audit

Inherits:
Object
  • Object
show all
Defined in:
lib/mysqlaudit/audit.rb

Instance Method Summary collapse

Constructor Details

#initialize(host, user, password, schema) ⇒ Audit

Returns a new instance of Audit.



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# File 'lib/mysqlaudit/audit.rb', line 14

def initialize(host, user, password, schema)
  $host     = host
  $user     = user
  $password = password
  $schema   = schema

  connect
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 23

def connect()
  begin
    @mysql = Mysql2::Client.new(:host     => $host,
                                :username => $user,
                                :password => $password,
                                :database => $schema)
  rescue
    puts "Can't connect to MySQL Server."
    exit 1
  end
end

#create_table ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 35

def create_table()
  if !has_table
    sql = <<SQL
CREATE TABLE IF NOT EXISTS audits (
  id int(10) unsigned NOT NULL AUTO_INCREMENT,
  type enum('I', 'U', 'D') NOT NULL,
  `table` char(64) NOT NULL,
  `column` char(64) NOT NULL,
  `primary_key` int(10) unsigned,
  `old` TEXT DEFAULT NULL,
  `new` TEXT DEFAULT NULL,
  `trigger_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (id),
  UNIQUE KEY id_UNIQUE (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
SQL

    @mysql.query(sql)
    puts "Created table audits in #{$schema} database."
  end
end

#create_trigger(table, actionName) ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 85

def create_trigger(table, actionName)
  if !has_trigger(table, actionName)
    columns = get_columns(table)
    key     = get_primary_key(table)

    if key
      sql = "CREATE TRIGGER audit_#{table}_#{actionName.downcase} AFTER #{actionName.upcase} ON #{table}\nFOR EACH ROW BEGIN\n"

      columns.each do | column |
        case actionName.downcase
          when :insert
            sql << "INSERT INTO audits (type, `table`, `column`, primary_key, old, new) VALUES ('#{actionName[0,1].upcase}', '#{table}', '#{column}', NEW.#{key}, NULL, NEW.#{column});\n"
          when :update
            sql << "IF OLD.#{column} <> NEW.#{column} THEN\n"
            sql << "  INSERT INTO audits (type, `table`, `column`, primary_key, old, new) VALUES ('#{actionName[0,1].upcase}', '#{table}', '#{column}', NEW.#{key}, OLD.#{column}, NEW.#{column});\n"
            sql << "END IF;\n"
          when :delete
            sql << "INSERT INTO audits (type, `table`, `column`, primary_key, old, new) VALUES ('#{actionName[0,1].upcase}', '#{table}', '#{column}', OLD.#{key}, OLD.#{column}, NULL);\n"
        end
      end

      sql << "END;"

      @mysql.query(sql)
      puts "Created trigger in #{table} table after #{actionName}."
    else
      puts "Impossible to create trigger in #{table}, not have primary key."
    end
  else
    puts "Impossible to create trigger in #{table}, has a trigger."
  end
end

#drop_table ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 62

def drop_table()
  return unless has_table()
  @mysql.query("DROP TABLE IF EXISTS audits;")
  puts "Delete table audits in #{$schema} database."
end

#drop_trigger(table, actionName) ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 118

def drop_trigger(table, actionName)
  if has_trigger(table, actionName)
    sql = "DROP TRIGGER IF EXISTS audit_#{table}_#{actionName};"
    @mysql.query(sql)
    puts "Deleted trigger in #{table} table after #{actionName}."
  end
end

#get_columns(table) ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 79

def get_columns(table)
  sql       = "SELECT column_name AS name FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='#{$schema}' AND TABLE_NAME='#{table}' AND column_key <> 'PRI';"
  sql_result = @mysql.query(sql)
  sql_result.map { |table| table['name']}
end

#get_primary_key(table) ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 74

def get_primary_key(table)
  sql = "SELECT column_name AS name FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='#{$schema}' AND TABLE_NAME='#{table}' AND column_key = 'PRI';"
  @mysql.query(sql).first['name']
end

#get_tables ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 68

def get_tables()
  sql        = "SELECT table_name AS name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = '#{$schema}' AND table_name <> 'audits';"
  sql_result = @mysql.query(sql)
  sql_result.map { |table| table['name']}
end

#has_table ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 57

def has_table()
  sql       = "SELECT true AS has FROM information_schema.tables WHERE table_schema = '#{$schema}' AND table_name = 'audits';"
  @mysql.query(sql).count == 1
end

#has_trigger(table, actionName) ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 126

def has_trigger(table, actionName)
  sql       = "SELECT true AS has FROM information_schema.triggers WHERE trigger_schema = '#{$schema}' AND trigger_name = 'audit_#{table}_#{actionName}';"
  @mysql.query(sql).count == 1
end

#rollback(table, statement) ⇒ Object 



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# File 'lib/mysqlaudit/audit.rb', line 131

def rollback(table, statement)
columns = get_columns(table)
key     = get_primary_key(table)

case statement
  when :insert
    sql = <<SQL
SELECT CONCAT('/* ', trigger_at, ' */ DELETE FROM #{table} WHERE id = ', MAX(primary_key),';') AS `row`
FROM audits
WHERE `type`  = 'I'
  AND `table` = '#{table}'
GROUP BY primary_key
ORDER BY trigger_at, primary_key, `column` ASC;
SQL
  when :delete
    sql = "SELECT CONCAT('/* ', trigger_at, ' */ INSERT INTO #{table} (#{key}, #{columns.join(', ')}) VALUES (', primary_key, ', ', "
    columns.each do | column |
      sql << " QUOTE(MAX(IF(`column` = '#{column}', `old`, NULL))), ', ', "
    end
    sql  = sql.chomp(" ', ', ")
    sql << "');'"
    sql << ") AS `row` FROM audits WHERE `type`  = 'D' AND `table` = '#{table}' GROUP BY primary_key ORDER BY trigger_at, primary_key, `column` ASC;"
  when :update
    sql = "SELECT CONCAT('/* ', trigger_at, ' */ UPDATE users SET ',  `column`, ' = ', QUOTE(old), ' WHERE id = ', primary_key, ';') AS `row`"
    sql << "FROM audits WHERE `type` = 'U' AND `table` = '#{table}' ORDER BY trigger_at, primary_key, `column` ASC;"
end

sql_result = @mysql.query(sql)
sql_result.each(:as => :array) do |row|
  puts row
end    end