Module: Galera

Included in:
Checker
Defined in:
lib/apprentice/checks/galera.rb

Instance Method Summary collapse

Instance Method Details

#check_cluster_size ⇒ Object 



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# File 'lib/apprentice/checks/galera.rb', line 35

def check_cluster_size
  return true if Integer(@status['wsrep_cluster_size']) > 1
  false
end

#check_local_state ⇒ Object 



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# File 'lib/apprentice/checks/galera.rb', line 45

def check_local_state
  s = Integer(@status['wsrep_local_state'])
  return true if s == 4 || (s == 2 && @donor_allowed)
  false
end

#check_ready_state ⇒ Object 



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# File 'lib/apprentice/checks/galera.rb', line 40

def check_ready_state
  return true if @status['wsrep_ready'] == 'ON'
  false
end

#get_galera_status ⇒ Object 



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# File 'lib/apprentice/checks/galera.rb', line 2

def get_galera_status
  begin
    result = @client.query "SHOW STATUS LIKE 'wsrep_%';"
    if result.count > 0
      result.each do |r|
        @status.merge!(Hash[*r])
      end
    end
  rescue Exception => message
    puts message
  end
end

#run_checks ⇒ Object 



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# File 'lib/apprentice/checks/galera.rb', line 15

def run_checks
  get_galera_status
  unless @status.empty?
    response = {code: 200, text: []}
    if !check_cluster_size
      response[:text] << "Cluster size is #{@status['wsrep_cluster_size']}. Split-brain situation is likely."
    end
    if !check_ready_state
      response[:text] << 'Cluster replication is not running.'
    end
    if !check_local_state
      response[:text] << "Local state is '#{STATES[@status['wsrep_local_state']]}'."
    end
    response[:code] = 503 unless response[:text].empty?
    return response
  else
    return {code: 503, text: ['Unable to determine cluster status']}
  end
end