Class: InstanceAgent::Agent::Base

Inherits:
Object
  • Object
show all
Includes:
Plugin
Defined in:
lib/instance_agent/agent/base.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Plugin

included

Class Method Details

.runner ⇒ Object 



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# File 'lib/instance_agent/agent/base.rb', line 9

def self.runner
  instance = self.new
  instance.validate if instance.respond_to?('validate')
  instance
end

Instance Method Details

#description ⇒ Object 



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# File 'lib/instance_agent/agent/base.rb', line 15

def description
  self.class.to_s
end

#log(severity, message) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/instance_agent/agent/base.rb', line 19

def log(severity, message)
  raise ArgumentError, "Unknown severity #{severity.inspect}" unless InstanceAgent::Log::SEVERITIES.include?(severity.to_s)
  InstanceAgent::Log.send(severity.to_sym, "#{description}: #{message}")
end

#run ⇒ Object 



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# File 'lib/instance_agent/agent/base.rb', line 24

def run
  start_time = Time.now

  begin
    perform
    @error_count = 0
  rescue Aws::Errors::MissingCredentialsError
    log(:error, "Missing credentials - please check if this instance was started with an IAM instance profile")
    @error_count = @error_count.to_i + 1
  rescue SocketError, Errno::ENETDOWN, Aws::Errors::ServiceError => e
    log(:error, "Cannot reach InstanceService: #{e.class} - #{e.message}")
    @error_count = @error_count.to_i + 1
  rescue Exception => e
    log(:error, "Error during perform: #{e.class} - #{e.message} - #{e.backtrace.join("\n")}")
    @error_count = @error_count.to_i + 1
  end

  if @error_count > 0
    # Max out at 90 seconds between calls and take 5 minutes before reaching the cap and allowing 10 calls to get there

    if @error_count > 10
      @error_count = 10
    end

    elapsed_time = (Time.now - start_time).ceil
    backoff_time = (((1.2675 ** @error_count) * (90.0 / (1.2675 ** 10)))).floor
    sleep_time = backoff_time - elapsed_time

    if(sleep_time > 0)
      log(:debug, "Sleeping #{sleep_time} seconds.")
      sleep sleep_time
    end
  end
end