Class: Puma::Cluster
Defined Under Namespace
Classes: Worker
Instance Method Summary
collapse
Methods inherited from Runner
#app, #daemon?, #development?, #error, #load_and_bind, #log, #output_header, #redirect_io, #start_server
Constructor Details
#initialize(cli) ⇒ Cluster
Returns a new instance of Cluster.
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# File 'lib/puma/cluster.rb', line 5
def initialize(cli)
super cli
@phase = 0
@workers = []
@phased_state = :idle
@phased_restart = false
end
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Instance Method Details
#all_workers_booted? ⇒ Boolean
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# File 'lib/puma/cluster.rb', line 74
def all_workers_booted?
@workers.count { |w| !w.booted? } == 0
end
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#check_workers ⇒ Object
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# File 'lib/puma/cluster.rb', line 78
def check_workers
while @workers.any?
pid = Process.waitpid(-1, Process::WNOHANG)
break unless pid
@workers.delete_if { |w| w.pid == pid }
end
spawn_workers
if @phased_state == :idle && all_workers_booted?
w = @workers.find { |x| x.phase != @phase }
if w
@phased_state = :waiting
log "- Stopping #{w.pid} for phased upgrade..."
w.term
end
end
end
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#halt ⇒ Object
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# File 'lib/puma/cluster.rb', line 181
def halt
@status = :halt
wakeup!
end
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#phased_restart ⇒ Object
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# File 'lib/puma/cluster.rb', line 161
def phased_restart
return false if @options[:preload_app]
@phased_restart = true
wakeup!
true
end
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#preload? ⇒ Boolean
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# File 'lib/puma/cluster.rb', line 190
def preload?
@options[:preload_app]
end
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#restart ⇒ Object
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# File 'lib/puma/cluster.rb', line 156
def restart
@restart = true
stop
end
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#run ⇒ Object
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# File 'lib/puma/cluster.rb', line 194
def run
@status = :run
"cluster"
log "* Process workers: #{@options[:workers]}"
if preload?
log "* Preloading application"
load_and_bind
else
log "* Phased restart available"
unless @cli.config.app_configured?
error "No application configured, nothing to run"
exit 1
end
@cli.binder.parse @options[:binds], self
end
read, @wakeup = Puma::Util.pipe
Signal.trap "SIGCHLD" do
wakeup!
end
master_pid = Process.pid
Signal.trap "SIGTERM" do
if Process.pid != master_pid
log "Early termination of worker"
exit! 0
else
stop
end
end
if preload?
Signal.trap "SIGUSR1" do
log "App preloaded, phased restart unavailable"
end
else
Signal.trap "SIGUSR1" do
phased_restart
end
end
@check_pipe, @suicide_pipe = Puma::Util.pipe
if daemon?
log "* Daemonizing..."
Process.daemon(true)
else
log "Use Ctrl-C to stop"
end
redirect_io
@cli.write_state
@master_read, @worker_write = read, @wakeup
spawn_workers
Signal.trap "SIGINT" do
stop
end
@cli.events.fire_on_booted!
begin
while @status == :run
begin
res = IO.select([read], nil, nil, 5)
if res
req = read.read_nonblock(1)
if req == "b"
pid = read.gets.to_i
w = @workers.find { |x| x.pid == pid }
if w
w.boot!
log "- Worker #{pid} booted, phase: #{w.phase}"
else
log "! Out-of-sync worker list, no #{pid} worker"
end
end
end
if @phased_restart
start_phased_restart
@phased_restart = false
end
check_workers
rescue Interrupt
@status = :stop
end
end
stop_workers unless @status == :halt
ensure
@check_pipe.close
@suicide_pipe.close
read.close
@wakeup.close
end
end
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#spawn_workers ⇒ Object
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# File 'lib/puma/cluster.rb', line 56
def spawn_workers
diff = @options[:workers] - @workers.size
upgrade = (@phased_state == :waiting)
master = Process.pid
diff.times do
pid = fork { worker(upgrade, master) }
@cli.debug "Spawned worker: #{pid}"
@workers << Worker.new(pid, @phase)
end
if diff > 0
@phased_state = :idle
end
end
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#start_phased_restart ⇒ Object
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# File 'lib/puma/cluster.rb', line 26
def start_phased_restart
@phase += 1
log "- Starting phased worker restart, phase: #{@phase}"
end
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#stats ⇒ Object
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# File 'lib/puma/cluster.rb', line 186
def stats
%Q!{ "workers": #{@workers.size}, "phase": #{@phase} }!
end
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#stop ⇒ Object
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# File 'lib/puma/cluster.rb', line 170
def stop
@status = :stop
wakeup!
end
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#stop_blocked ⇒ Object
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# File 'lib/puma/cluster.rb', line 175
def stop_blocked
@status = :stop if @status == :run
wakeup!
Process.waitall
end
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#stop_workers ⇒ Object
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# File 'lib/puma/cluster.rb', line 15
def stop_workers
log "- Gracefully shutting down workers..."
@workers.each { |x| x.term }
begin
Process.waitall
rescue Interrupt
log "! Cancelled waiting for workers"
end
end
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#wakeup! ⇒ Object
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# File 'lib/puma/cluster.rb', line 103
def wakeup!
begin
@wakeup.write "!" unless @wakeup.closed?
rescue SystemCallError, IOError
end
end
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#worker(upgrade, master) ⇒ Object
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# File 'lib/puma/cluster.rb', line 110
def worker(upgrade, master)
$0 = "puma: cluster worker: #{master}"
Signal.trap "SIGINT", "IGNORE"
@master_read.close
@suicide_pipe.close
Thread.new do
IO.select [@check_pipe]
log "! Detected parent died, dying"
exit! 1
end
if upgrade
if dir = @options[:worker_directory]
log "+ Changing to #{dir}"
Dir.chdir dir
end
end
hooks = @options[:worker_boot]
hooks.each { |h| h.call }
server = start_server
Signal.trap "SIGTERM" do
server.stop
end
begin
@worker_write << "b#{Process.pid}\n"
rescue SystemCallError, IOError
STDERR.puts "Master seems to have exitted, exitting."
return
end
server.run.join
ensure
@worker_write.close
end
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