/usr/lib/ruby/vendor_ruby/merb-core/rack/adapter/abstract.rb is in ruby-merb-core 1.1.3+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module System
class PortablePoller
def initialize(pid)
@pid = pid
end
# Memory usage in kilobytes (resident set size)
def memory
ps_int('rss')
end
# Percentage memory usage
def percent_memory
ps_float('%mem')
end
# Percentage CPU usage
def percent_cpu
ps_float('%cpu')
end
private
def ps_int(keyword)
`ps -o #{keyword}= -p #{@pid}`.to_i
end
def ps_float(keyword)
`ps -o #{keyword}= -p #{@pid}`.to_f
end
def ps_string(keyword)
`ps -o #{keyword}= -p #{@pid}`.strip
end
def time_string_to_seconds(text)
_, minutes, seconds, useconds = *text.match(/(\d+):(\d{2}).(\d{2})/)
(minutes.to_i * 60) + seconds.to_i
end
end
end
end
module Merb
module Rack
class AbstractAdapter
# This method is designed to be overridden in a rack adapter. It
# will be called to start a server created with the new_server method.
# This is called from the AbstractAdapter start method.
#
# :api: plugin
# @overridable
def self.start_server
raise NotImplemented
end
# This method is designed to be overridden in a rack adapter. It will
# be called to create a new instance of the server for the adapter to
# start. The adapter should attempt to bind to a port at this point.
# This is called from the AbstractAdapter start method.
#
# ==== Parameters
# port<Integer>:: The port the server should listen on
#
# :api: plugin
# @overridable
def self.new_server(port)
raise NotImplemented
end
# This method is designed to be overridden in a rack adapter. It will
# be called to stop the adapter server.
#
# ==== Parameters
# status<Integer>:: The exit status the adapter should exit with.
#
# ==== Returns
# Boolean:: True if the server was properly stopped.
#
# :api: plugin
# @overridable
def self.stop(status)
raise NotImplemented
end
# Spawn a new worker process at a port.
#
# ==== Parameters
# port<Integer>:: The port to start the worker process on.
#
# :api: private
def self.spawn_worker(port)
worker_pid = Kernel.fork
# If we have a worker_pid, we're in the parent.
if worker_pid.nil?
# Seed the random number generator
Kernel.srand
# Restart the run_later worker, unless we're in the parent or it's alive.
Merb::Worker.restart unless Merb::Worker.alive?
# Spawn the worker
start_at_port(port, @opts)
throw(:new_worker)
end
@pids[port] = worker_pid
$WORKERS = @pids.values
end
# The main start method for bootloaders that support forking.
# This method launches the adapters which inherit using the
# new_server and start_server methods. This method should not
# be overridden in adapters which want to fork.
#
# ==== Parameters
# opts<Hash>:: A hash of options
# socket: the socket to bind to
# port: the port to bind to
# cluster: the number
#
# :api: private
def self.start(opts={})
@opts = opts
$WORKERS ||= []
parent = nil
@pids = {}
port = (opts[:socket] || opts[:port]).to_i
max_port = Merb::Config[:cluster] ? Merb::Config[:cluster] - 1 : 0
# If we only have a single merb, just start it up and dispense with
# the spawner/worker setup.
if max_port == 0
start_at_port(port)
return
end
$0 = process_title(:spawner, port)
# For each port, spawn a new worker. The parent will continue in
# the loop, while the worker will throw :new_worker and be booted
# out of the loop.
catch(:new_worker) do
0.upto(max_port) do |i|
parent = spawn_worker(port + i)
end
end
# If we're in a worker, we're done. Otherwise, we've completed
# setting up workers and now need to watch them.
return unless parent
# For each worker, set up a thread in the spawner to watch it
0.upto(max_port) do |i|
Thread.new do
catch(:new_worker) do
loop do
pid, status = @pids[port + i], nil
poller = Merb::System::PortablePoller.new(pid)
begin
i = 0
loop do
# Watch for the pid to exit.
_, status = Process.wait2(pid, Process::WNOHANG)
break if status
if (i % 120 == 0) && Merb::Config[:max_memory] && poller.memory > Merb::Config[:max_memory]
Process.kill("INT", pid)
if (Process.kill(0, pid) rescue false)
sleep Merb::Config[:hang_time] || 5
Process.kill(9, pid)
Process.wait2(pid) if (Process.kill(0, pid) rescue false)
end
status = Struct.new(:exitstatus).new(nil)
break
end
i += 1
sleep 0.25
end
# If the pid doesn't exist, we want to silently exit instead of
# raising here.
rescue SystemCallError => e
ensure
# If there was no worker with that PID, the status was non-0
# (we send back a status of 128 when ABRT is called on a
# worker, and Merb.fatal! exits with a status of 1), or if
# Merb is in the process of exiting, *then* don't respawn.
# Note that processes killed with kill -9 will return no
# exitstatus, and we respawn them.
if !status ||
(status.exitstatus && status.exitstatus != 0) ||
Merb.exiting then
Thread.exit
end
end
# Otherwise, respawn the worker, and watch it again.
spawn_worker(port + i)
end
end
end
end
# The spawner process will make it here, and when it does, it should just
# sleep so it can pick up ctrl-c if it's in console mode.
sleep
end
# Fork a server on the specified port and start the app.
#
# ==== Parameters
# port<Integer>:: The port to start the server on
# opts<Hash>:: The hash of options, defaults to the @opts
# instance variable.
#
# :api: private
def self.start_at_port(port, opts = @opts)
at_exit do
Merb::Server.remove_pid(port)
end
# If Merb is daemonized, trap INT. If it's not daemonized,
# we let the master process' ctrl-c control the cluster
# of workers.
if Merb::Config[:daemonize]
Merb.trap('INT') do
Merb.exiting = true
stop
Merb.logger.warn! "Exiting port #{port}\n"
exit_process
end
# If it was not fork_for_class_load, we already set up
# ctrl-c handlers in the master thread.
elsif Merb::Config[:fork_for_class_load]
if Merb::Config[:console_trap]
Merb::Server.add_irb_trap
end
end
# In daemonized mode or not, support HUPing the process to
# restart it.
Merb.trap('HUP') do
Merb.exiting = true
stop
Merb.logger.warn! "Exiting port #{port} on #{Process.pid}\n"
exit_process
end
# ABRTing the process will kill it, and it will not be respawned.
Merb.trap('ABRT') do
Merb.exiting = true
stopped = stop(128)
Merb.logger.warn! "Exiting port #{port}\n" if stopped
exit_process(128)
end
# Each worker gets its own `ps' name.
$0 = process_title(:worker, port)
# Store the PID for this worker
Merb::Server.store_pid(port)
Merb::Config[:log_delimiter] = "#{process_title(:worker, port)} ~ "
Merb.reset_logger!
Merb.logger.warn!("Starting #{self.name.split("::").last} at port #{port}")
# If we can't connect to the port, keep trying until we can. Print
# a warning about this once. Try every 0.25s.
printed_warning = false
loop do
begin
# Call the adapter's new_server method, which should attempt
# to bind to a port.
new_server(port)
rescue Errno::EADDRINUSE => e
if Merb::Config[:bind_fail_fatal]
Merb.fatal! "Could not bind to #{port}. It was already in use", e
end
unless printed_warning
Merb.logger.warn! "Port #{port} is in use, " \
"Waiting for it to become available."
printed_warning = true
end
sleep 0.25
next
end
break
end
Merb.logger.warn! "Successfully bound to port #{port}"
Merb::Server.change_privilege
# Call the adapter's start_server method.
start_server
end
# Exit the process with the specified status.
#
# ==== Parameters
# status<Integer>:: The exit code of the process.
#
# :api: private
def self.exit_process(status = 0)
exit(status)
end
# Set the process title.
#
# ==== Parameters
# whoami<Symbol>:: Either :spawner for the master process or :worker for any of the worker
# processes.
# port<Integer>:: The base port that the app is running on.
#
# :api: private
def self.process_title(whoami, port)
name = Merb::Config[:name]
app = "merb#{" : #{name}" if (name && name != "merb")}"
max_port = Merb::Config[:cluster] ? (Merb::Config[:cluster] - 1) : 0
numbers = ((whoami != :worker) && (max_port > 0)) ? "#{port}..#{port + max_port}" : port
file = Merb::Config[:socket_file] % port if Merb::Config[:socket_file]
listening_on = if Merb::Config[:socket]
"socket#{'s' if max_port > 0 && whoami != :worker} #{numbers} "\
"#{file ? file : "#{Merb.log_path}/#{name}.#{port}.sock"}"
else
"port#{'s' if max_port > 0 && whoami != :worker} #{port}"
end
"#{app} : #{whoami} (#{listening_on})"
end
end
end
end
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