lib/zbatery.rb

   1 # -*- encoding: binary -*-
   2 # :enddoc:
   3 require 'rainbows'
   4 Rainbows.forked = true
   5 module Zbatery
   6
   7   VERSION = "4.0.0"
   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       trap(:INT) { stop(false) }
  79       trap(:TERM) { stop(false) }
  80       trap(:QUIT) { stop }
  81       trap(:USR1) { reopen_logs }
  82       trap(:USR2) { reexec }
  83       trap(:HUP) { reexec; stop }
  84
  85       # technically feasible in some cases, just not sanely supportable:
  86       %w(TTIN TTOU WINCH).each do |sig|
  87         trap(sig) { logger.info "SIG#{sig} is not handled by Zbatery" }
  88       end
  89
  90       if ready_pipe
  91         ready_pipe.syswrite($$.to_s)
  92         ready_pipe.close
  93         self.ready_pipe = nil
  94       end
  95       extend(Rainbows.const_get(@use))
  96       worker = Worker.new(0)
  97       before_fork.call(self, worker)
  98       worker_loop(worker) # runs forever
  99     end
 100
 101     def stop(graceful = true)
 102       Rainbows.quit!
 103       exit!(0) unless graceful
 104     end
 105
 106     def before_fork
 107       hook = super
 108       hook == Zbatery::FORK_HOOK or
 109         logger.warn "calling before_fork without forking"
 110       hook
 111     end
 112
 113     def after_fork
 114       hook = super
 115       hook == Zbatery::FORK_HOOK or
 116         logger.warn "calling after_fork without having forked"
 117       hook
 118     end
 119   end
 120 end
 121
 122 Unicorn::Configurator::DEFAULTS[:before_fork] =
 123   Unicorn::Configurator::DEFAULTS[:after_fork] = Zbatery::FORK_HOOK