Module: Checker

Included in:
Server::EventServer
Defined in:
lib/apprentice/checker.rb

Overview

Contains all the relevant methods for checking on a server’s state

Conditionally includes either MariaDB/MySQL or Galera related checking code

Constant Summary collapse

CODES =

HTTP response codes and their respective return value

We’re constructing our dumb HTTP response handler using these

{200 => 'OK',503 => 'Service Unavailable'}

Instance Method Summary collapse

Instance Method Details

#format_text(texts) ⇒ Object

Format our HTTP/1.1 response properly without using arbitrary line breaks.

Attributes

  • texts - A hash containing all text responses returned from run_checks.

Return values

  • value - The comprehensive text returned with a HTTP response.

Examples

t = ['Something', 'Something else']
response = format_text(t)
response.inspect # => 'Something\r\nSomething else\r\n'



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# File 'lib/apprentice/checker.rb', line 35

def format_text(texts)
  value = ''
  if !texts.empty?
    texts.each do |t|
      value << "#{t}\r\n"
    end
  end
  return value
end

#generate_response(code = 503, text) ⇒ Object

Generates the actual output returned by the Server::EventServer class.

It’s valid HTTP/1.1 and should be understood by almost any browser. Certainly by HAProxy’s httpchk.

Attributes

  • code - The HTTP code for the returned response

  • text - Formatted text to be returned with the response

Return values

  • String - A HTTP response string

Examples

code = 503
text = 'Something is wrong'

response = generate_response(code, text)
response.inspect # => 'HTTP/1.1 503 Service Unavailable\r\nContent-type: text/plain\r\nContent-length: 18\r\n\r\nSomething is wrong\r\n'



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# File 'lib/apprentice/checker.rb', line 65

def generate_response(code = 503, text)
  "HTTP/1.1 #{code} #{CODES[code]}\r\nContent-type: text/plain\r\nContent-length: #{text.length}\r\n\r\n#{text}"
end