Class: Easymon::SplitActiveRecordCheck

Inherits:
Object
  • Object
show all
Defined in:
lib/easymon/checks/split_active_record_check.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ SplitActiveRecordCheck

Here we pass a block so we get a fresh instance of ActiveRecord::Base or whatever other class we might be using to make database connections

For example, given the following other class: module Easymon

class Base < ActiveRecord::Base
  def establish_connection(spec = nil)
    if spec
      super
    elsif config = Easymon.database_configuration
      super config
    end
  end

  def database_configuration
    env = "#{Rails.env}_replica"
    config = YAML.load_file(Rails.root.join('config/database.yml'))[env]
  end
end

end

We would check both it and ActiveRecord::Base like so: check = Easymon::SplitActiveRecordCheck.new 

[ActiveRecord::Base.connection, Easymon::Base.connection]

Easymon::Repository.add(“split-database”, check)



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# File 'lib/easymon/checks/split_active_record_check.rb', line 32

def initialize(&block)
  self.block = block
end

Instance Attribute Details

#block ⇒ Object

Returns the value of attribute block.



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# File 'lib/easymon/checks/split_active_record_check.rb', line 3

def block
  @block
end

#results ⇒ Object

Returns the value of attribute results.



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# File 'lib/easymon/checks/split_active_record_check.rb', line 4

def results
  @results
end

Instance Method Details

#check ⇒ Object

Assumes only 2 connections



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# File 'lib/easymon/checks/split_active_record_check.rb', line 37

def check
  connections = Array(@block.call)

  results = connections.map{|connection| database_up?(connection) }

  primary_status = results.first ? "Primary: Up" : "Primary: Down"
  replica_status = results.last ? "Replica: Up" : "Replica: Down"

  [(results.all? && results.count > 0), "#{primary_status} - #{replica_status}"]
end