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wsgi-loader.py

#!/usr/bin/env python
#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2010-2025 Asynchronous B.V.
#
#  "Passenger", "Phusion Passenger" and "Union Station" are registered
#  trademarks of Asynchronous B.V.
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.

import sys, os, threading, signal, traceback, socket, select, struct, logging, errno
import tempfile, json, time
if sys.version_info[0] >= 3 and sys.version_info[1] >= 5:
	from importlib import util
else:
	import imp

options = {}

def abort(message):
	sys.stderr.write(message + "\n")
	sys.exit(1)

def try_write_file(path, contents):
	try:
		with open(path, 'w') as f:
			f.write(contents)
	except IOError as e:
		logging.warn('Warning: unable to write to ' + path + ': ' + e.strerror)

def initialize_logging():
	logging.basicConfig(
		level = logging.WARNING,
		format = "[ pid=%(process)d, time=%(asctime)s ]: %(message)s")
	if hasattr(logging, 'captureWarnings'):
		logging.captureWarnings(True)

def read_startup_arguments():
	global options

work_dir = os.getenv('PASSENGER_SPAWN_WORK_DIR')
	assert work_dir is not None
	path = work_dir + '/args.json'
	with open(path, 'r') as f:
		options = json.load(f)

def record_journey_step_begin(step, state):
	work_dir = os.getenv('PASSENGER_SPAWN_WORK_DIR')
	assert work_dir is not None
	step_dir = work_dir + '/response/steps/' + step.lower()
	try_write_file(step_dir + '/state', state)
	try_write_file(step_dir + '/begin_time', str(time.time()))

def record_journey_step_end(step, state):
	work_dir = os.getenv('PASSENGER_SPAWN_WORK_DIR')
	assert work_dir is not None
	step_dir = work_dir + '/response/steps/' + step.lower()
	try_write_file(step_dir + '/state', state)
	if not os.path.exists(step_dir + '/begin_time') and not os.path.exists(step_dir + '/begin_time_monotonic'):
		try_write_file(step_dir + '/begin_time', str(time.time()))
	try_write_file(step_dir + '/end_time', str(time.time()))

def load_app():
	global options

sys.path.insert(0, os.getcwd())
	startup_file = options.get('startup_file', 'passenger_wsgi.py')
	if sys.version_info[0] >= 3 and sys.version_info[1] >= 5:
		spec = util.spec_from_file_location("passenger_wsgi", startup_file)
		assert spec is not None
		app_module = util.module_from_spec(spec)
		assert spec.loader is not None
		spec.loader.exec_module(app_module)
		return app_module
	else:
		return imp.load_source('passenger_wsgi', startup_file)

def create_server_socket():
	global options

UNIX_PATH_MAX = int(options.get('UNIX_PATH_MAX', 100))
	if 'socket_dir' in options:
		socket_dir = options['socket_dir']
		socket_prefix = 'wsgi'
	else:
		socket_dir = tempfile.gettempdir()
		socket_prefix = 'PsgWsgiApp'

i = 0
	while i < 128:
		try:
			return make_socket(socket_dir, socket_prefix, UNIX_PATH_MAX)
		except socket.error as e:
			if e.errno == errno.EADDRINUSE:
				i += 1
				if i == 128:
					raise e
			else:
				raise e

def make_socket(socket_dir, socket_prefix, UNIX_PATH_MAX):
	s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
	socket_suffix = format(struct.unpack('Q', os.urandom(8))[0], 'x')
	filename = socket_dir + '/' + socket_prefix + '.' + socket_suffix
	filename = filename[0:UNIX_PATH_MAX]
	s.bind(filename)
	s.listen(1000)
	return (filename, s)

def install_signal_handlers():
	def debug(sig, frame):
		id2name = dict([(th.ident, th.name) for th in threading.enumerate()])
		code = []
		for thread_id, stack in sys._current_frames().items():
			code.append("\n# Thread: %s(%d)" % (id2name.get(thread_id,""), thread_id))
			for filename, lineno, name, line in traceback.extract_stack(stack):
				code.append('  File: "%s", line %d, in %s' % (filename, lineno, name))
				if line:
					code.append("    %s" % (line.strip()))
		print("\n".join(code))

def debug_and_exit(sig, frame):
		debug(sig, frame)
		sys.exit(1)

# Unfortunately, there's no way to install a signal handler that prints
	# the backtrace without interrupting the current system call. os.siginterrupt()
	# doesn't seem to work properly either. That is why we only have a SIGABRT
	# handler and no SIGQUIT handler.
	signal.signal(signal.SIGABRT, debug_and_exit)

def advertise_sockets(socket_filename):
	work_dir = os.getenv('PASSENGER_SPAWN_WORK_DIR')
	assert work_dir is not None
	path = work_dir + '/response/properties.json'
	doc = {
		'sockets': [
			{
				'name': 'main',
				'address': 'unix:' + socket_filename,
				'protocol': 'session',
				'concurrency': 1,
				'accept_http_requests': True
			}
		]
	}
	with open(path, 'w') as f:
		json.dump(doc, f)

def advertise_readiness():
	work_dir = os.getenv('PASSENGER_SPAWN_WORK_DIR')
	assert work_dir is not None
	path = work_dir + '/response/finish'
	with open(path, 'w') as f:
		f.write('1')

if sys.version_info[0] >= 3:
	def reraise_exception(exc_info):
		raise exc_info[0].with_traceback(exc_info[1], exc_info[2])

def bytes_to_str(b):
		return b.decode('latin-1')

def str_to_bytes(s):
		if isinstance(s, bytes):
			return s
		else:
			return s.encode('latin-1')
else:
	def reraise_exception(exc_info):
		exec("raise exc_info[0], exc_info[1], exc_info[2]")

def bytes_to_str(b):
		return b

def str_to_bytes(s):
		return s

class RequestHandler:
	def __init__(self, server_socket, owner_pipe, app):
		self.server = server_socket
		self.owner_pipe = owner_pipe
		self.app = app

def main_loop(self):
		done = False
		try:
			while not done:
				client, address = self.accept_connection()
				if not client:
					done = True
					break
				socket_hijacked = False
				try:
					try:
						env, input_stream = self.parse_request(client)
						if env:
							if env['REQUEST_METHOD'] == 'ping':
								self.process_ping(client)
							else:
								socket_hijacked = self.process_request(env, input_stream, client)
					except KeyboardInterrupt:
						done = True
					except IOError as e:
						if not getattr(e, 'passenger', False) or e.errno != errno.EPIPE:
							logging.exception("WSGI application raised an I/O exception!")
					except Exception:
						logging.exception("WSGI application raised an exception!")
				finally:
					if not socket_hijacked:
						try:
							# Shutdown the socket like this just in case the app
							# spawned a child process that keeps it open.
							client.shutdown(socket.SHUT_WR)
						except:
							pass
						try:
							client.close()
						except:
							pass
		except KeyboardInterrupt:
			pass

def accept_connection(self):
		result = select.select([self.owner_pipe, self.server.fileno()], [], [])[0]
		if self.server.fileno() in result:
			return self.server.accept()
		else:
			return (None, None)

def parse_request(self, client):
		buf = b''
		while len(buf) < 4:
			tmp = client.recv(4 - len(buf))
			if len(tmp) == 0:
				return (None, None)
			buf += tmp
		header_size = struct.unpack('>I', buf)[0]

buf = b''
		while len(buf) < header_size:
			tmp = client.recv(header_size - len(buf))
			if len(tmp) == 0:
				return (None, None)
			buf += tmp

headers = buf.split(b"\0")
		headers.pop() # Remove trailing "\0"
		env = {}
		i = 0
		while i < len(headers):
			env[bytes_to_str(headers[i])] = bytes_to_str(headers[i + 1])
			i += 2

return (env, client)

if hasattr(socket, '_fileobject'):
		def wrap_input_socket(self, sock):
			return socket._fileobject(sock, 'rb', 512)
	else:
		def wrap_input_socket(self, sock):
			return socket.socket.makefile(sock, 'rb', 512)

def process_request(self, env, input_stream, output_stream):
		# The WSGI specification says that the input parameter object passed needs to
		# implement a few file-like methods. This is the reason why we "wrap" the socket._socket
		# into the _fileobject to solve this.
		#
		# Otherwise, the POST data won't be correctly retrieved by Django.
		#
		# See: http://www.python.org/dev/peps/pep-0333/#input-and-error-streams
		env['wsgi.input']        = self.wrap_input_socket(input_stream)
		env['wsgi.errors']       = sys.stderr
		env['wsgi.version']      = (1, 0)
		env['wsgi.multithread']  = False
		env['wsgi.multiprocess'] = True
		env['wsgi.run_once']	 = False
		if env.get('HTTPS','off') in ('on', '1', 'true', 'yes'):
			env['wsgi.url_scheme'] = 'https'
		else:
			env['wsgi.url_scheme'] = 'http'

headers_set = []
		headers_sent = []
		is_head = env['REQUEST_METHOD'] == 'HEAD'

def write(data):
			try:
				if not headers_set:
					raise AssertionError("write() before start_response()")
				elif not headers_sent:
					# Before the first output, send the stored headers.
					status, response_headers = headers_sent[:] = headers_set
					output_stream.sendall(str_to_bytes(
						'HTTP/1.1 %s\r\nStatus: %s\r\nConnection: close\r\n' %
						(status, status)))
					for header in response_headers:
						output_stream.sendall(str_to_bytes('%s: %s\r\n' % header))
					output_stream.sendall(b'\r\n')
				if not is_head:
					output_stream.sendall(str_to_bytes(data))
			except IOError as e:
				# Mark this exception as coming from the Phusion Passenger
				# socket and not some other socket.
				setattr(e, 'passenger', True)
				raise e

def start_response(status, response_headers, exc_info = None):
			if exc_info:
				try:
					if headers_sent:
						# Re-raise original exception if headers sent.
						reraise_exception(exc_info)
				finally:
					# Avoid dangling circular ref.
					exc_info = None
			elif headers_set:
				raise AssertionError("Headers already set!")

headers_set[:] = [status, response_headers]
			return write

# Django's django.template.base module goes through all WSGI
		# environment values, and calls each value that is a callable.
		# No idea why, but we work around that with the `do_it` parameter.
		def hijack(do_it = False):
			if do_it:
				env['passenger.hijacked_socket'] = output_stream
				return output_stream

env['passenger.hijack'] = hijack

result = self.app(env, start_response)
		if 'passenger.hijacked_socket' in env:
			# Socket connection hijacked. Don't do anything.
			return True
		try:
			for data in result:
				# Don't send headers until body appears.
				if data:
					write(data)
			if not headers_sent:
				# Send headers now if body was empty.
				write(b'')
		finally:
			if hasattr(result, 'close'):
				result.close()
		return False

def process_ping(self, output_stream):
		output_stream.sendall(b"pong")

if __name__ == "__main__":
	initialize_logging()
	record_journey_step_end('SUBPROCESS_EXEC_WRAPPER', 'STEP_PERFORMED')
	record_journey_step_begin('SUBPROCESS_WRAPPER_PREPARATION', 'STEP_IN_PROGRESS')
	try:
		read_startup_arguments()
	except Exception:
		record_journey_step_end('SUBPROCESS_WRAPPER_PREPARATION', 'STEP_ERRORED')
		raise
	else:
		record_journey_step_end('SUBPROCESS_WRAPPER_PREPARATION', 'STEP_PERFORMED')

record_journey_step_begin('SUBPROCESS_APP_LOAD_OR_EXEC', 'STEP_IN_PROGRESS')
	try:
		app_module = load_app()
	except Exception:
		record_journey_step_end('SUBPROCESS_APP_LOAD_OR_EXEC', 'STEP_ERRORED')
		raise
	else:
		record_journey_step_end('SUBPROCESS_APP_LOAD_OR_EXEC', 'STEP_PERFORMED')

record_journey_step_begin('SUBPROCESS_LISTEN', 'STEP_IN_PROGRESS')
	try:
		tuple = create_server_socket()
		assert tuple is not None
		socket_filename, server_socket = tuple
		install_signal_handlers()
		handler = RequestHandler(server_socket, sys.stdin, app_module.application)
		advertise_sockets(socket_filename)
	except Exception:
		record_journey_step_end('SUBPROCESS_LISTEN', 'STEP_ERRORED')
		raise
	else:
		record_journey_step_end('SUBPROCESS_LISTEN', 'STEP_PERFORMED')

advertise_readiness()
	handler.main_loop()
	try:
		os.remove(socket_filename)
	except OSError:
		pass

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-02-12 09:18:31
..	dir	-	root/root	0755	2026-02-12 09:18:31
download_binaries	dir	-	root/root	0755	2026-02-12 09:18:31
README.md	text/plain	306 B	root/root	0644	2026-01-27 11:50:52
backtrace-sanitizer.rb	text/x-ruby	4.37 KB	root/root	0755	2026-01-27 11:50:52
crash-watch.rb	text/x-ruby	1.47 KB	root/root	0755	2026-01-27 11:50:52
meteor-loader.rb	text/x-ruby	8.32 KB	root/root	0755	2026-01-27 11:50:52
node-loader.js	text/plain	12.69 KB	root/root	0644	2026-01-27 11:50:52
prespawn	text/x-ruby	3.96 KB	root/root	0755	2026-01-27 11:50:52
rack-loader.rb	text/x-ruby	5.04 KB	root/root	0644	2026-01-27 11:50:52
rack-preloader.rb	text/x-ruby	7.74 KB	root/root	0644	2026-01-27 11:50:52
wsgi-loader.py	text/x-script.python	12.3 KB	root/root	0644	2026-01-27 11:50:52
wsgi-loader.pyc	text/x-bytecode.python	14.44 KB	root/root	0644	2026-02-05 09:04:25
wsgi-loader.pyo	text/x-bytecode.python	14.21 KB	root/root	0644	2026-02-05 09:04:25

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