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 WINCH) & Signal.list.keys
CONNECT_TIMEOUT =
1
BOOT_TIMEOUT =
20

Instance Attribute Summary collapse

Attributes inherited from Command

#args, #env

Instance Method Summary collapse

Methods inherited from Command

call

Constructor Details

#initialize(args) ⇒ Run


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# File 'lib/spring/client/run.rb', line 14

def initialize(args)
  super

  @signal_queue  = []
  @server_booted = false
end

Instance Attribute Details

#serverObject (readonly)

Returns the value of attribute server


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# File 'lib/spring/client/run.rb', line 12

def server
  @server
end

Instance Method Details

#boot_serverObject


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# File 'lib/spring/client/run.rb', line 73

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

  pid     = Process.spawn(gem_env, env.server_command, out: File::NULL)
  timeout = Time.now + BOOT_TIMEOUT

  @server_booted = true

  until env.socket_path.exist?
    _, status = Process.waitpid2(pid, Process::WNOHANG)

    if status
      exit status.exitstatus
    elsif Time.now > timeout
      $stderr.puts "Starting Spring server with `#{env.server_command}` " \
                   "timed out after #{BOOT_TIMEOUT} seconds"
      exit 1
    end

    sleep 0.1
  end
end

#callObject


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# File 'lib/spring/client/run.rb', line 29

def call
  begin
    connect
  rescue Errno::ENOENT, Errno::ECONNRESET, Errno::ECONNREFUSED
    cold_run
  else
    warm_run
  end
ensure
  server.close if server
end

#cold_runObject


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# File 'lib/spring/client/run.rb', line 55

def cold_run
  boot_server
  connect
  run
end

#connectObject


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# File 'lib/spring/client/run.rb', line 25

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

#connect_to_application(client) ⇒ Object


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# File 'lib/spring/client/run.rb', line 133

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

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

#default_rails_envObject


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# File 'lib/spring/client/run.rb', line 227

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

#forward_signal(sig, application) ⇒ Object


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# File 'lib/spring/client/run.rb', line 206

def forward_signal(sig, application)
  if kill(sig, application) != 0
    # If the application process is gone, then don't block the
    # signal on this process.
    trap(sig, 'DEFAULT')
    Process.kill(sig, Process.pid)
  end
end

#forward_signals(application) ⇒ Object


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# File 'lib/spring/client/run.rb', line 198

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

  FORWARDED_SIGNALS.each do |sig|
    trap(sig) { forward_signal sig, application }
  end
end

#gem_envObject


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# File 'lib/spring/client/run.rb', line 100

def gem_env
  bundle = Bundler.bundle_path.to_s
  paths  = Gem.path + ENV["GEM_PATH"].to_s.split(File::PATH_SEPARATOR)

  {
    "GEM_PATH" => [bundle, *paths].uniq.join(File::PATH_SEPARATOR),
    "GEM_HOME" => bundle
  }
end

#kill(sig, application) ⇒ Object


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# File 'lib/spring/client/run.rb', line 215

def kill(sig, application)
  application.puts(sig)
  application.gets.to_i
end

#log(message) ⇒ Object


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# File 'lib/spring/client/run.rb', line 21

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

#queue_signalsObject


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# File 'lib/spring/client/run.rb', line 180

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

#runObject


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# File 'lib/spring/client/run.rb', line 61

def run
  verify_server_version

  application, client = UNIXSocket.pair

  queue_signals
  connect_to_application(client)
  run_command(client, application)
rescue Errno::ECONNRESET
  exit 1
end

#run_command(client, application) ⇒ Object


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# File 'lib/spring/client/run.rb', line 144

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}"

    suspend_resume_on_tstp_cont(pid)

    forward_signals(application)
    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 220

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

  socket.puts  data.bytesize
  socket.write data
end

#server_booted?Boolean


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# File 'lib/spring/client/run.rb', line 96

def server_booted?
  @server_booted
end

#stop_serverObject


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# File 'lib/spring/client/run.rb', line 110

def stop_server
  server.close
  @server = nil
  env.stop
end

#suspend_resume_on_tstp_cont(pid) ⇒ Object


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# File 'lib/spring/client/run.rb', line 186

def suspend_resume_on_tstp_cont(pid)
  trap("TSTP") {
    log "suspended"
    Process.kill("STOP", pid.to_i)
    Process.kill("STOP", Process.pid)
  }
  trap("CONT") {
    log "resumed"
    Process.kill("CONT", pid.to_i)
  }
end

#verify_server_versionObject


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# File 'lib/spring/client/run.rb', line 116

def verify_server_version
  server_version = server.gets.chomp
  if server_version != env.version
    $stderr.puts "There is a version mismatch between the Spring client " \
                   "(#{env.version}) and the server (#{server_version})."

    if server_booted?
      $stderr.puts "We already tried to reboot the server, but the mismatch is still present."
      exit 1
    else
      $stderr.puts "Restarting to resolve."
      stop_server
      cold_run
    end
  end
end

#warm_runObject


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# File 'lib/spring/client/run.rb', line 41

def warm_run
  run
rescue CommandNotFound
  require "spring/commands"

  if Spring.command?(args.first)
    # Command installed since Spring started
    stop_server
    cold_run
  else
    raise
  end
end