lib/zbatery.rb

   1 # -*- encoding: binary -*-
   2 # :enddoc:
   3 require 'rainbows'
   4 Rainbows.forked = true
   5 module Zbatery
   6
   7   VERSION = "4.1.2"
   8
   9   Rainbows::Const::RACK_DEFAULTS["SERVER_SOFTWARE"] = "Zbatery #{VERSION}"
  10
  11   # we don't actually fork workers, but allow using the
  12   # {before,after}_fork hooks found in Unicorn/Rainbows!
  13   # config files...
  14   FORK_HOOK = lambda { |_,_| }
  15 end
  16
  17 # :stopdoc:
  18 # override stuff we don't need or can't use portably
  19 module Rainbows
  20
  21   module Base
  22     # master == worker in our case
  23     def init_worker_process(worker)
  24       after_fork.call(self, worker)
  25       worker.user(*user) if user.kind_of?(Array) && ! worker.switched
  26       build_app! unless preload_app
  27       Rainbows::Response.setup
  28       Rainbows::MaxBody.setup
  29       Rainbows::ProcessClient.const_set(:APP, @app)
  30
  31       logger.info "Zbatery #@use worker_connections=#@worker_connections"
  32     end
  33   end
  34
  35   # we can't/don't need to do the fchmod heartbeat Unicorn/Rainbows! does
  36   def self.tick
  37     alive
  38   end
  39
  40   class HttpServer
  41
  42     # only used if no concurrency model is specified
  43     def worker_loop(worker)
  44       init_worker_process(worker)
  45       begin
  46         ret = IO.select(LISTENERS, nil, nil, nil) and
  47         ret[0].each do |sock|
  48           io = sock.kgio_tryaccept and process_client(io)
  49         end
  50       rescue Errno::EINTR
  51       rescue Errno::EBADF, TypeError
  52         break
  53       rescue => e
  54         Rainbows::Error.listen_loop(e)
  55       end while Rainbows.alive
  56     end
  57
  58     # no-op
  59     def maintain_worker_count; end
  60     def spawn_missing_workers; end
  61     def init_self_pipe!; end
  62
  63     # can't just do a graceful exit if reopening logs fails, so we just
  64     # continue on...
  65     def reopen_logs
  66       logger.info "reopening logs"
  67       Unicorn::Util.reopen_logs
  68       logger.info "done reopening logs"
  69       rescue => e
  70         logger.error "failed reopening logs #{e.message}"
  71     end
  72
  73     def trap_deferred(sig)
  74       # nothing
  75     end
  76
  77     def join
  78       at_exit { unlink_pid_safe(pid) if pid }
  79       trap(:INT) { exit!(0) }
  80       trap(:TERM) { exit!(0) }
  81       trap(:QUIT) { Thread.new { stop } }
  82       trap(:USR1) { Thread.new { reopen_logs } }
  83       trap(:USR2) { Thread.new { reexec } }
  84       trap(:HUP) { Thread.new { reexec; stop } }
  85       trap(:CHLD, "DEFAULT")
  86
  87       # technically feasible in some cases, just not sanely supportable:
  88       %w(TTIN TTOU WINCH).each do |sig|
  89         trap(sig) do
  90           Thread.new { logger.info("SIG#{sig} is not handled by Zbatery") }
  91         end
  92       end
  93
  94       if ready_pipe
  95         ready_pipe.syswrite($$.to_s)
  96         ready_pipe.close
  97         self.ready_pipe = nil
  98       end
  99       extend(Rainbows.const_get(@use))
 100       worker = Worker.new(0)
 101       before_fork.call(self, worker)
 102       worker_loop(worker) # runs forever
 103     end
 104
 105     def stop(graceful = true)
 106       Rainbows.quit!
 107       graceful ? exit : exit!(0)
 108     end
 109
 110     def before_fork
 111       hook = super
 112       hook == Zbatery::FORK_HOOK or
 113         logger.warn "calling before_fork without forking"
 114       hook
 115     end
 116
 117     def after_fork
 118       hook = super
 119       hook == Zbatery::FORK_HOOK or
 120         logger.warn "calling after_fork without having forked"
 121       hook
 122     end
 123   end
 124 end
 125
 126 Unicorn::Configurator::DEFAULTS[:before_fork] =
 127   Unicorn::Configurator::DEFAULTS[:after_fork] = Zbatery::FORK_HOOK