Module: Capistrano::HAProxy

Defined in:
lib/capistrano-haproxy.rb,
lib/capistrano-haproxy/version.rb

Constant Summary collapse

VERSION = 
"0.0.2"

Class Method Summary collapse

Class Method Details

.extended(configuration) ⇒ Object 



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# File 'lib/capistrano-haproxy.rb', line 9

def self.extended(configuration)
  configuration.load {
    namespace(:haproxy) {
      _cset(:haproxy_path, "/etc/haproxy")

      _cset(:haproxy_global) {{
#           "chroot" => "/usr/share/haproxy",
        "daemon" => "",
        "group" => fetch(:haproxy_group, "haproxy"),
#           "quiet" => "",
        "spread-checks" => 0,
        "user" => fetch(:haproxy_user, "haproxy"),
        "tune.maxaccept" => 100,
      }}
      _cset(:haproxy_defaults) {{
        "balance" => "roundrobin",
        "grace" => 0,
        "log" => "global",
        "maxconn" => fetch(:haproxy_connections, 65535),
        "mode" => "tcp",
        "option" => [
          "clitcpka",
          "contstats",
          "dontlognull",
          "redispatch",
#             "splice-auto",
          "srvtcpka",
#             "transparent",
        ],
        "retries" => 3,
        "timeout" => [
          "client #{fetch(:haproxy_client_tieout, '1h')}",
          "connect #{fetch(:haproxy_connct_timeout, '3s')}",
          "server #{fetch(:haproxy_server_timeout, '1h')}",
        ],
      }}
      _cset(:haproxy_listens, {})
      #
      # Example:
      #
      # set(:haproxy_listens) {{
      #   "stats 127.0.0.1:8888" => {
      #     :mode => "http",
      #     :stats => "uri /server-status",
      #   },
      #   "mysql 127.0.0.1:3306" => {
      #     :mode => "tcp",
      #     :servers => [
      #       "foo foo.example.com:3306 check inter 5000 weight 1",
      #       "bar bar.example.com:3306 check inter 5000 weight 1 backup",
      #     ],
      #   }
      # }}
      #

      desc("Setup HAProxy.")
      task(:setup, :roles => :app, :except => { :no_release => true }) {
        transaction {
          install
          _update
        }
      }
      after 'deploy:setup', 'haproxy:setup'

      desc("Update HAProxy configuration.")
      task(:update, :roles => :app, :except => { :no_release => true }) {
        transaction {
          _update
        }
      }
      # Do not run automatically during normal `deploy' to avoid slow down.
      # If you want to do so, add following line in your ./config/deploy.rb
      #
      # after 'deploy:finalize_update', 'haproxy:update'

      task(:_update, :roles => :app, :except => { :no_release => true }) {
        configure
        reload
      }

      task(:install, :roles => :app, :except => { :no_release => true }) {
        install_dependencies
        install_service
      }

      _cset(:haproxy_platform) {
        capture((<<-EOS).gsub(/\s+/, ' ')).strip
          if test -f /etc/debian_version; then
            if test -f /etc/lsb-release && grep -i -q DISTRIB_ID=Ubuntu /etc/lsb-release; then
              echo ubuntu;
            else
              echo debian;
            fi;
          elif test -f /etc/redhat-release; then
            echo redhat;
          else
            echo unknown;
          fi;
        EOS
      }
      _cset(:haproxy_dependencies, %w(haproxy))
      task(:install_dependencies, :roles => :app, :except => { :no_release => true }) {
        unless haproxy_dependencies.empty?
          case haproxy_platform
          when /(debian|ubuntu)/i
            run("#{sudo} apt-get install -q -y #{haproxy_dependencies.join(' ')}")
          when /redhat/i
            run("#{sudo} yum install -q -y #{haproxy_dependencies.join(' ')}")
          else
            # nop
          end
        end
      }

      task(:install_service, :roles => :app, :except => { :no_release => true }) {
        # TODO: setup (sysvinit|daemontools|upstart|runit|systemd) service of HAProxy
      }

      _cset(:haproxy_template_path, File.join(File.dirname(__FILE__), 'capistrano-haproxy', 'templates'))
      _cset(:haproxy_configure_files, %w(/etc/default/haproxy haproxy.cfg))
      task(:configure, :roles => :app, :except => { :no_release => true }) {
        haproxy_configure_files.each do |f|
          safe_put(template(f, :path => haproxy_template_path), ( File.expand_path(f) == f ? f : File.join(haproxy_path, f) ),
                   :place => :if_modified, :sudo => true)
        end
      }

      _cset(:haproxy_service_name, 'haproxy')
      desc("Start HAProxy daemon.")
      task(:start, :roles => :app, :except => { :no_release => true }) {
        run("#{sudo} service #{haproxy_service_name} start")
      }

      desc("Stop HAProxy daemon.")
      task(:stop, :roles => :app, :except => { :no_release => true }) {
        run("#{sudo} service #{haproxy_service_name} stop")
      }

      desc("Restart HAProxy daemon.")
      task(:restart, :roles => :app, :except => { :no_release => true }) {
        run("#{sudo} service #{haproxy_service_name} restart || #{sudo} service #{haproxy_service_name} start")
      }

      desc("Reload HAProxy daemon.")
      task(:reload, :roles => :app, :except => { :no_release => true }) {
        run("#{sudo} service #{haproxy_service_name} reload || #{sudo} service #{haproxy_service_name} start")
      }

      desc("Show HAProxy daemon status.")
      task(:status, :roles => :app, :except => { :no_release => true }) {
        run("#{sudo} service #{haproxy_service_name} status")
      }
    }
  }
end