Class: Spring::Client::Run

Inherits:
Command
  • Object
show all
Defined in:
lib/spring/client/run.rb

Constant Summary collapse

FORWARDED_SIGNALS = 
%w(INT QUIT USR1 USR2 INFO) & Signal.list.keys
TIMEOUT = 
1

Instance Attribute Summary

Attributes inherited from Command

#args, #env

Instance Method Summary collapse

Methods inherited from Command

call

Constructor Details

#initialize(args) ⇒ Run

Returns a new instance of Run.



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# File 'lib/spring/client/run.rb', line 10

def initialize(args)
  super
  @signal_queue = []
end

Instance Method Details

#boot_server ⇒ Object 



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# File 'lib/spring/client/run.rb', line 38

def boot_server
  env.socket_path.unlink if env.socket_path.exist?

  pid = fork {
    require "spring/server"
    Spring::Server.boot
  }

  until env.socket_path.exist?
    _, status = Process.waitpid2(pid, Process::WNOHANG)
    exit status.exitstatus if status
    sleep 0.1
  end
end

#call ⇒ Object 



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# File 'lib/spring/client/run.rb', line 23

def call
  boot_server unless env.server_running?
  verify_server_version

  application, client = UNIXSocket.pair

  queue_signals
  connect_to_application(client)
  run_command(client, application)
rescue Errno::ECONNRESET
  exit 1
ensure
  server.close if @server
end

#connect_to_application(client) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 66

def connect_to_application(client)
  server.send_io client
  send_json server, "args" => args, "default_rails_env" => default_rails_env

  if IO.select([server], [], [], TIMEOUT)
    server.gets or raise CommandNotFound
  else
    raise "Error connecting to Spring server"
  end
end

#default_rails_env ⇒ Object 



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# File 'lib/spring/client/run.rb', line 146

def default_rails_env
  ENV['RAILS_ENV'] || ENV['RACK_ENV'] || 'development'
end

#forward_signal(sig, pid) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 126

def forward_signal(sig, pid)
  kill(sig, pid)
rescue Errno::ESRCH
  # If the application process is gone, then don't block the
  # signal on this process.
  trap(sig, 'DEFAULT')
  Process.kill(sig, Process.pid)
end

#forward_signals(pid) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 117

def forward_signals(pid)
  @signal_queue.each { |sig| kill sig, pid }

  FORWARDED_SIGNALS.each do |sig|
    trap(sig) { forward_signal sig, pid }
  end
rescue Errno::ESRCH
end

#kill(sig, pid) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 135

def kill(sig, pid)
  Process.kill(sig, -Process.getpgid(pid))
end

#log(message) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 15

def log(message)
  env.log "[client] #{message}"
end

#queue_signals ⇒ Object 



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# File 'lib/spring/client/run.rb', line 111

def queue_signals
  FORWARDED_SIGNALS.each do |sig|
    trap(sig) { @signal_queue << sig }
  end
end

#run_command(client, application) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 77

def run_command(client, application)
  log "sending command"

  application.send_io STDOUT
  application.send_io STDERR
  application.send_io STDIN

  send_json application, "args" => args, "env" => ENV.to_hash

  pid = server.gets
  pid = pid.chomp if pid

  # We must not close the client socket until we are sure that the application has
  # received the FD. Otherwise the FD can end up getting closed while it's in the server
  # socket buffer on OS X. This doesn't happen on Linux.
  client.close

  if pid && !pid.empty?
    log "got pid: #{pid}"

    forward_signals(pid.to_i)
    status = application.read.to_i

    log "got exit status #{status}"

    exit status
  else
    log "got no pid"
    exit 1
  end
ensure
  application.close
end

#send_json(socket, data) ⇒ Object 



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# File 'lib/spring/client/run.rb', line 139

def send_json(socket, data)
  data = JSON.dump(data)

  socket.puts  data.bytesize
  socket.write data
end

#server ⇒ Object 



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# File 'lib/spring/client/run.rb', line 19

def server
  @server ||= UNIXSocket.open(env.socket_name)
end

#verify_server_version ⇒ Object 



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# File 'lib/spring/client/run.rb', line 53

def verify_server_version
  server_version = server.gets.chomp
  if server_version != env.version
    $stderr.puts <<-ERROR
There is a version mismatch between the spring client and the server.
You should restart the server and make sure to use the same version.

CLIENT: #{env.version}, SERVER: #{server_version}
ERROR
    exit 1
  end
end