Class: HaproxyApi

Inherits:
Sinatra::Base
  • Object
show all
Defined in:
lib/hapi/application/app.rb

Instance Method Summary collapse

Instance Method Details

#get_config ⇒ Object 



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# File 'lib/hapi/application/app.rb', line 43

def get_config
  return { 'frontend' => {}, 'backend' => {} } if !File.exists?($mutable_haproxy_config)
  return JSON.parse(File.read($mutable_haproxy_config))
end

#render(config) ⇒ Object 



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# File 'lib/hapi/application/app.rb', line 49

def render(config)
  content = ""
  f = File.open($haproxy_config, "r")
  in_gen_section = false
  f.each_line do |line|
    if line =~ /HAPROXY_API_GENERATED/
      if in_gen_section 
        in_gen_section = false
      else
        in_gen_section = true          
      end
    else
      if !in_gen_section
         content += line
      end       
    end      
  end
  f.close

  content += "# HAPROXY_API_GENERATED - START\n"
  
  config['frontend'].each_pair do |name, frontend|
    content += "frontend #{name}\n"
    content += "  bind 0.0.0.0:#{frontend['port']}\n"
    content += "  default_backend #{name}-backend\n"
    content += "\n"
  end

  config['backend'].each_pair do |name, backend|
    content += "backend #{name}\n"
    content += "  balance #{backend['lbmethod']}\n"
    
    if backend.has_key?('options')
      backend['options'].each_pair do |k,v|
        content += "  option #{k} #{v}\n"
      end
    end
    
    port = backend['port']
    server_options = ""
    if backend.has_key?('server_options')
      backend['server_options'].each_pair do |k,v|
        server_options += "#{k} #{v} "
      end
    end

    backend['servers'].each do |server|
      content += "  server #{server}:#{port} #{server}:#{port} #{server_options} \n"      
    end
    content += "\n"        
  end

  content += "# HAPROXY_API_GENERATED - END\n"
        
  return content
end

#set_config(config) ⇒ Object 



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# File 'lib/hapi/application/app.rb', line 107

def set_config(config)
  ts = Time.now.to_i
  `cp #{$haproxy_config} #{$haproxy_config}.#{ts}`
  content = render config
  File.open($mutable_haproxy_config, 'w') { |file| file.write(JSON.dump(config)) }
  File.open($haproxy_config, 'w') { |file| file.write(content) }        
  
  result = `/usr/sbin/haproxy -c -f #{$haproxy_config}`
  if $?.to_i == 0
    puts `systemctl restart haproxy`
  else
    puts "rolling back config - got:"
    puts result
    `cp #{$haproxy_config}.#{ts} #{$haproxy_config}`
    return status(500)
  end
end