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"""Create and manage the CherryPy application engine."""
import cgi
import os
import signal
import sys
import threading
import time
import cherrypy
from cherrypy import _cprequest
# Use a flag to indicate the state of the application engine.
STOPPED = 0
STARTING = None
STARTED = 1
def fileattr(m):
if hasattr(m, "__loader__"):
if hasattr(m.__loader__, "archive"):
return m.__loader__.archive
return getattr(m, "__file__", None)
def signal_handler(signum, frame):
if signum in (signal.SIGHUP,):
cherrypy.engine.reexec()
else:
cherrypy.server.stop()
cherrypy.engine.stop()
signal.signal(signal.SIGHUP, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)
class Engine(object):
"""The application engine, which exposes a request interface to (HTTP) servers."""
request_class = _cprequest.Request
response_class = _cprequest.Response
def __init__(self):
self.state = STOPPED
# Startup/shutdown hooks
self.on_start_engine_list = []
self.on_stop_engine_list = []
self.on_start_thread_list = []
self.on_stop_thread_list = []
self.seen_threads = {}
self.mtimes = {}
self.reload_files = []
def start(self, blocking=True):
"""Start the application engine."""
self.state = STARTING
conf = cherrypy.config.get
# Output config options to log
if conf("log_config", True):
cherrypy.config.log_config()
for func in self.on_start_engine_list:
func()
self.state = STARTED
if blocking:
self.block()
def block(self):
"""Block forever (wait for stop(), KeyboardInterrupt or SystemExit)."""
try:
autoreload = cherrypy.config.get('autoreload.on', False)
if autoreload:
i = 0
freq = cherrypy.config.get('autoreload.frequency', 1)
while self.state != STOPPED:
time.sleep(.1)
# Autoreload
if autoreload:
i += .1
if i > freq:
i = 0
self.autoreload()
except KeyboardInterrupt:
cherrypy.log("<Ctrl-C> hit: shutting down app engine", "ENGINE")
cherrypy.server.stop()
self.stop()
except SystemExit:
cherrypy.log("SystemExit raised: shutting down app engine", "ENGINE")
cherrypy.server.stop()
self.stop()
raise
except:
# Don't bother logging, since we're going to re-raise.
# Note that we don't stop the HTTP server here.
self.stop()
raise
def reexec(self):
"""Re-execute the current process."""
cherrypy.server.stop()
self.stop()
args = sys.argv[:]
cherrypy.log("Re-spawning %s" % " ".join(args), "ENGINE")
args.insert(0, sys.executable)
if sys.platform == "win32":
args = ['"%s"' % arg for arg in args]
os.execv(sys.executable, args)
def autoreload(self):
"""Reload the process if registered files have been modified."""
for filename in map(fileattr, sys.modules.values()) + self.reload_files:
if filename:
if filename.endswith(".pyc"):
filename = filename[:-1]
try:
mtime = os.stat(filename).st_mtime
except OSError:
if filename in self.mtimes:
# The file was probably deleted.
self.reexec()
if filename not in self.mtimes:
self.mtimes[filename] = mtime
continue
if mtime > self.mtimes[filename]:
# The file has been modified.
self.reexec()
def stop(self):
"""Stop the application engine."""
if self.state != STOPPED:
for thread_ident, i in self.seen_threads.iteritems():
for func in self.on_stop_thread_list:
func(i)
self.seen_threads.clear()
for func in self.on_stop_engine_list:
func()
self.state = STOPPED
cherrypy.log("CherryPy shut down", "ENGINE")
def restart(self):
"""Restart the application engine (doesn't block)."""
self.stop()
self.start(blocking=False)
def wait(self):
"""Block the caller until ready to receive requests (or error)."""
while not self.ready:
time.sleep(.1)
def _is_ready(self):
return bool(self.state == STARTED)
ready = property(_is_ready, doc="Return True if the engine is ready to"
" receive requests, False otherwise.")
def request(self, client_address, remote_host, scheme="http"):
"""Obtain an HTTP Request object.
client_address: the (IP address, port) of the client
remote_host should be the client's host name. If not available
(because no reverse DNS lookup is performed), the client
IP should be provided.
scheme: either "http" or "https"; defaults to "http"
"""
if self.state == STOPPED:
r = NotReadyRequest("The CherryPy engine has stopped.")
elif self.state == STARTING:
r = NotReadyRequest("The CherryPy engine could not start.")
else:
# Only run on_start_thread_list if the engine is running.
threadID = threading._get_ident()
if threadID not in self.seen_threads:
i = len(self.seen_threads) + 1
self.seen_threads[threadID] = i
for func in self.on_start_thread_list:
func(i)
r = self.request_class(client_address[0], client_address[1],
remote_host, scheme)
cherrypy.serving.request = r
cherrypy.serving.response = self.response_class()
return r
def start_with_callback(self, func, args=None, kwargs=None):
"""Start, then callback the given func in a new thread."""
if args is None:
args = ()
if kwargs is None:
kwargs = {}
args = (func,) + args
def _callback(func, *a, **kw):
self.wait()
func(*a, **kw)
t = threading.Thread(target=_callback, args=args, kwargs=kwargs)
t.setName("CPEngine Callback " + t.getName())
t.start()
self.start()
class NotReadyRequest:
def __init__(self, msg):
self.msg = msg
def close(self):
pass
def run(self, request_line, headers, rfile):
self.method = "GET"
cherrypy.HTTPError(503, self.msg).set_response()
cherrypy.response.finalize()
return cherrypy.response
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