"""Threaded Application Server
The AppServer is the main process of WebKit. It handles requests for
servlets from webservers.
ThreadedAppServer uses a threaded model for handling multiple requests.
At one time there were other experimental execution models for AppServer,
but none of these were successful and have been removed.
The ThreadedAppServer/AppServer distinction is thus largely historical.
ThreadedAppServer takes the following command line arguments:
start: start the AppServer (default argument)
stop: stop the currently running Apperver
daemon: run as a daemon
ClassName.SettingName=value: change configuration settings
When started, the app server records its pid in appserver.pid.
"""
import errno
import os
import select
import socket
import sys
import threading
import traceback
import Queue
from marshal import dumps, loads
from threading import Thread, currentThread
from time import time, localtime, sleep
try:
from ctypes import pythonapi, c_long, py_object
except ImportError:
py_object = c_long = pythonapi = None
try:
PyThreadState_SetAsyncExc = pythonapi.PyThreadState_SetAsyncExc
except (TypeError, AttributeError):
PyThreadState_SetAsyncExc = None
try:
import fcntl
F_GETFD, F_SETFD = fcntl.F_SETFD, fcntl.F_SETFD
except (ImportError, AttributeError):
fcntl = None
else:
try:
FD_CLOEXEC = fcntl.FD_CLOEXEC
except AttributeError:
FD_CLOEXEC = 1
from MiscUtils.Funcs import asclocaltime
from WebUtils.Funcs import requestURI
import AppServer as AppServerModule
from PidFile import ProcessRunning
from AutoReloadingAppServer import AutoReloadingAppServer as AppServer
from ASStreamOut import ASStreamOut, ConnectionAbortedError
from HTTPExceptions import HTTPServiceUnavailable
debug = False
defaultConfig = dict(
Host = 'localhost',
EnableAdapter = True,
AdapterPort = 8086,
EnableMonitor = False,
SCGIPort = 8084,
EnableSCGI = False,
MonitorPort = 8085,
EnableHTTP = True,
HTTPPort = 8080,
StartServerThreads = 10,
MinServerThreads = 5,
MaxServerThreads = 20,
UseDaemonThreads = True,
MaxRequestTime = 300,
RequestQueueSize = 0,
RequestBufferSize = 8*1024,
ResponseBufferSize = 8*1024,
AddressFiles = '%s.address',
)
intLength = len(dumps(int(1)))
server = None
exitStatus = 0
class NotEnoughDataError(Exception):
"""Not enough data received error"""
class ProtocolError(Exception):
"""Network protocol error"""
class ThreadAbortedError(HTTPServiceUnavailable):
"""Thread aborted error"""
class RequestAbortedError(ThreadAbortedError):
"""Request aborted error"""
class RequestTooLongError(RequestAbortedError):
"""Request lasts too long error"""
class ServerShutDownError(ThreadAbortedError):
"""Server has been shut down error"""
class WorkerThread(Thread):
"""Base class for Webware worker threads that can be aborted.
(Idea taken from: http://sebulba.wikispaces.com/recipe+thread2)
"""
_canAbort = PyThreadState_SetAsyncExc is not None
def threadID(self):
"""Return the thread's internal id."""
try:
return self._threadID
except AttributeError:
for threadID, t in threading._active.items():
if t is self:
self._threadID = threadID
return threadID
def abort(self, exception=ThreadAbortedError):
"""Abort the current thread by raising an exception in its context.
A return value of one means the thread was successfully aborted,
a value of zero means the thread could not be found,
any other value indicates that an error has occurred.
"""
if not self._canAbort:
if debug:
print "Error: Aborting threads is not possible"
return -1
if debug:
print "Aborting worker thread..."
try:
processing = self.isAlive() and self._processing
except AttributeError:
processing = False
if not processing:
if debug:
print "Error: Thread is not working."
threadID = self.threadID()
if threadID is None:
if debug:
print "Error: Worker thread id not found"
return 0
if debug:
print "Worker thread id is", threadID
try:
ret = PyThreadState_SetAsyncExc(
c_long(threadID), py_object(exception))
if ret > 1:
PyThreadState_SetAsyncExc(c_long(threadID), py_object())
except Exception:
ret = -1
if debug:
if ret == 0:
print "Error: Could not find thread", threadID
elif ret != 1:
print "Error: Could not abort thread", threadID
return ret
def setCloseOnExecFlag(fd):
"""Set flag for file descriptor not to be inherited by child processes."""
try:
fcntl.fcntl(fd, F_SETFD, fcntl.fcntl(fd, F_GETFD) | FD_CLOEXEC)
except IOError:
pass
class ThreadedAppServer(AppServer):
"""Threaded Application Server.
`ThreadedAppServer` accepts incoming socket requests, spawns a
new thread or reuses an existing one, then dispatches the request
to the appropriate handler (e.g., an Adapter handler, HTTP handler,
etc., one for each protocol).
The transaction is connected directly to the socket, so that the
response is sent directly (if streaming is used, like if you call
`response.flush()`). Thus the ThreadedAppServer packages the
socket/response, rather than value being returned up the call chain.
"""
def __init__(self, path=None):
"""Setup the AppServer.
Create an initial thread pool (threads created with `spawnThread`),
and the request queue, record the PID in a file, and add any enabled
handlers (Adapter, HTTP, Monitor).
"""
self._threadPool = []
self._threadCount = 0
self._threadUseCounter = []
self._addr = {}
self._requestID = 0
self._socketHandlers = {}
self._handlerCache = {}
self._threadHandler = {}
self._sockets = {}
self._defaultConfig = None
AppServer.__init__(self, path)
try:
threadCount = self.setting('StartServerThreads')
self._maxServerThreads = self.setting('MaxServerThreads')
self._minServerThreads = self.setting('MinServerThreads')
self._useDaemonThreads = self.setting('UseDaemonThreads')
self._requestQueueSize = self.setting('RequestQueueSize')
if not self._requestQueueSize:
self._requestQueueSize = 2 * self._maxServerThreads
elif self._requestQueueSize < self._maxServerThreads:
self._requestQueueSize = self._maxServerThreads
self._requestBufferSize = self.setting('RequestBufferSize')
self._responseBufferSize = self.setting('ResponseBufferSize')
self._requestQueue = Queue.Queue(self._requestQueueSize)
maxRequestTime = self.setting('MaxRequestTime') or None
if maxRequestTime and not self._canAbortRequest:
print ("Warning: MaxRequestTime setting ineffective"
" (cannot abort requests)")
maxRequestTime = None
self._maxRequestTime = maxRequestTime
self._checkRequestTime = None
out = sys.stdout
out.write('Creating %d threads' % threadCount)
for i in range(threadCount):
self.spawnThread()
if not debug:
out.write(".")
out.flush()
out.write("\n")
if self.setting('EnableAdapter'):
self.addSocketHandler(AdapterHandler)
if self.setting('EnableMonitor'):
self.addSocketHandler(MonitorHandler)
if self.setting('EnableSCGI'):
self.addSocketHandler(SCGIHandler)
if self.setting('EnableHTTP'):
from HTTPServer import HTTPAppServerHandler
self.addSocketHandler(HTTPAppServerHandler)
self.readyForRequests()
if maxRequestTime:
self._checkRequestTime = time() + maxRequestTime
except:
AppServer.initiateShutdown(self)
raise
def addSocketHandler(self, handlerClass, serverAddress=None):
"""Add socket handler.
Adds a socket handler for `serverAddress` -- `serverAddress`
is a tuple ``(host, port)``, where ``host`` is the interface
to connect to (for instance, the IP address on a machine with
multiple IP numbers), and ``port`` is the port (e.g. HTTP is on
80 by default, and Webware adapters use 8086 by default).
The `handlerClass` is a subclass of `Handler`, and is used to
handle the actual request -- usually returning control back
to ThreadedAppServer in some fashion. See `Handler` for more.
"""
if serverAddress is None:
serverAddress = self.address(handlerClass.settingPrefix)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
sock.bind(serverAddress)
sock.listen(1024)
if fcntl:
setCloseOnExecFlag(sock.fileno())
except Exception:
print "Error: Can not listen for %s on %s" % (
handlerClass.settingPrefix, str(serverAddress))
sys.stdout.flush()
raise
serverAddress = sock.getsockname()
self._socketHandlers[serverAddress] = handlerClass
self._handlerCache[serverAddress] = []
self._sockets[serverAddress] = sock
adrStr = ':'.join(map(str, serverAddress))
print "Listening for %s on %s" % (handlerClass.settingPrefix, adrStr)
adrFile = self.addressFileName(handlerClass)
if os.path.exists(adrFile):
print "Warning: %s already exists" % adrFile
try:
os.unlink(adrFile)
except (AttributeError, OSError):
if open(adrFile).read() == adrStr:
return
else:
print "Error: Could not remove", adrFile
sys.stdout.flush()
raise
try:
f = open(adrFile, 'w')
f.write(adrStr)
f.close()
except IOError:
print "Error: Could not write", adrFile
sys.stdout.flush()
raise
def isPersistent(self):
return True
def defaultConfig(self):
"""The default AppServer.config."""
if self._defaultConfig is None:
self._defaultConfig = AppServer.defaultConfig(self).copy()
self._defaultConfig.update(defaultConfig)
return self._defaultConfig
_ignoreErrnos = []
for e in 'EAGAIN', 'EWOULDBLOCK', 'EINTR', 'ECONNABORTED', 'EPROTO':
try:
_ignoreErrnos.append(getattr(errno, e))
except AttributeError:
pass
def mainloop(self, timeout=1):
"""Main thread loop.
This is the main thread loop that accepts and dispatches
socket requests.
It goes through a loop as long as ``self._running > 2``.
Setting ``self._running = 2`` asks the the main loop to end.
When the main loop is finished, it sets ``self._running = 1``.
When the AppServer is completely down, it sets ``self._running = 0``.
The loop waits for connections, then based on the connecting
port it initiates the proper Handler (e.g.,
AdapterHandler, HTTPHandler). Handlers are reused when possible.
The initiated handlers are put into a queue, and
worker threads poll that queue to look for requests that
need to be handled (worker threads use `threadloop`).
Every so often (every 5 loops) it updates thread usage
information (`updateThreadUsage`), and every
``MaxServerThreads * 2`` loops it it will manage
threads (killing or spawning new ones, in `manageThreadCount`).
"""
threadCheckInterval = self._maxServerThreads * 2
threadUpdateDivisor = 5
threadCheck = 0
self._running = 3
try:
while self._running > 2:
try:
input, output, exc = select.select(
self._sockets.values(), [], [], timeout)
except select.error, e:
if e[0] not in self._ignoreErrnos:
raise
if debug:
print "Socket select error:", e
continue
for sock in input:
try:
client, addr = sock.accept()
except select.error, e:
if e[0] not in self._ignoreErrnos:
raise
if debug:
print "Socket accept error:", e
continue
serverAddress = sock.getsockname()
try:
handler = self._handlerCache[serverAddress].pop()
except IndexError:
handler = self._socketHandlers[serverAddress](self,
serverAddress)
self._requestID += 1
handler.activate(client, self._requestID)
self._requestQueue.put(handler)
if threadCheck % threadUpdateDivisor == 0:
self.updateThreadUsage()
if threadCheck > threadCheckInterval:
threadCheck = 0
self.manageThreadCount()
else:
threadCheck += 1
self.abortLongRequests()
self.restartIfNecessary()
finally:
self._running = 1
def updateThreadUsage(self):
"""Update the threadUseCounter list.
Called periodically from `mainloop`.
"""
count = self.activeThreadCount()
if len(self._threadUseCounter) > self._maxServerThreads:
self._threadUseCounter.pop(0)
self._threadUseCounter.append(count)
def activeThreadCount(self):
"""Get a snapshot of the number of threads currently in use.
Called from `updateThreadUsage`.
"""
count = 0
for t in self._threadPool:
if t._processing:
count += 1
return count
def manageThreadCount(self):
"""Adjust the number of threads in use.
From information gleened from `updateThreadUsage`, we see about how
many threads are being used, to see if we have too many threads or
too few. Based on this we create or absorb threads.
"""
average = max = 0
if debug:
print "ThreadUse Samples:", self._threadUseCounter
for i in self._threadUseCounter:
average += i
if i > max:
max = i
average /= len(self._threadUseCounter)
if debug:
print "Average Thread Use: ", average
print "Max Thread Use: ", max
print "ThreadCount: ", self._threadCount
if len(self._threadUseCounter) < self._maxServerThreads:
return
margin = self._threadCount / 2
if debug:
print "Margin:", margin
if (average > self._threadCount - margin
and self._threadCount < self._maxServerThreads):
n = min(self._threadCount,
self._maxServerThreads - self._threadCount)
if debug:
print "Adding %s threads" % n
for i in range(n):
self.spawnThread()
elif (average < self._threadCount - margin
and self._threadCount > self._minServerThreads):
n = min(self._threadCount - self._minServerThreads,
self._threadCount - max)
self.absorbThread(n)
else:
self.absorbThread(0)
def spawnThread(self):
"""Create a new worker thread.
Worker threads poll with the `threadloop` method.
"""
if debug:
print "Spawning new thread"
t = WorkerThread(target=self.threadloop)
t._processing = False
if self._useDaemonThreads:
t.setDaemon(True)
t.start()
self._threadPool.append(t)
self._threadCount += 1
if debug:
print "New thread spawned, threadCount =", self._threadCount
def absorbThread(self, count=1):
"""Absorb a thread.
We do this by putting a None on the Queue.
When a thread gets it, that tells it to exit.
We also keep track of the threads, so after killing
threads we go through all the threads and find the
thread(s) that have exited, so that we can take them
out of the thread pool.
"""
for i in range(count):
self._requestQueue.put(None)
self._threadCount -= 1
for t in self._threadPool:
if not t.isAlive():
t.join()
self._threadPool.remove(t)
if debug:
print "Thread absorbed, real threadCount =", len(self._threadPool)
_canAbortRequest = WorkerThread._canAbort
def abortRequest(self, requestID, exception=RequestAbortedError):
"""Abort a request by raising an exception in its worker thread.
A return value of one means the thread was successfully aborted,
a value of zero means the thread could not be found,
any other value indicates that an error has occurred.
"""
verbose = self._verbose
if verbose:
print "Aborting request", requestID
if not self._canAbortRequest:
if verbose:
print "Error: Cannot abort requests"
return -1
for t, h in self._threadHandler.items():
try:
handlerRequestID = h._requestID
except AttributeError:
handlerRequestID = None
if requestID == handlerRequestID:
t._abortHandler = h
try:
if self._threadHandler[t] is not h:
raise KeyError
ret = t.abort(exception)
except Exception:
ret = 0
t._abortHandler = None
break
else:
ret = 0
if verbose:
if ret == 0:
print "Error: Could not find thread for this request"
elif ret == 1:
print "The worker thread for this request has been aborted"
else:
print "Error: Could not abort thread for this request"
return ret
def abortLongRequests(self):
"""Check for long-running requests and cancel these.
The longest allowed execution time for requests is controlled
by the MaxRequestTime setting.
"""
if self._checkRequestTime is None:
return
currentTime = time()
if currentTime > self._checkRequestTime:
if debug:
print "Checking for long-running requests"
verbose = self._verbose
minRequestTime = currentTime - self._maxRequestTime
for t, h in self._threadHandler.items():
try:
requestDict = h._requestDict
requestID = requestDict['requestID']
requestTime = requestDict['time']
except (AttributeError, KeyError):
continue
if requestTime < minRequestTime:
t._abortHandler = h
try:
if self._threadHandler[t] is not h:
raise KeyError
if verbose:
print "Aborting long-running request", requestID
t.abort(RequestTooLongError)
except Exception:
pass
t._abortHandler = None
elif requestTime < currentTime:
currentTime = requestTime
self._checkRequestTime = currentTime + self._maxRequestTime
def threadloop(self):
"""The main loop for worker threads.
Worker threads poll the `_requestQueue` to find a request handler
waiting to run. If they find a None in the queue, this thread has
been selected to die, which is the way the loop ends.
The handler object does all the work when its `handleRequest` method
is called.
`initThread` and `delThread` methods are called at the beginning and
end of the thread loop, but they aren't being used for anything
(future use as a hook).
"""
self.initThread()
t = currentThread()
t._processing = False
t._abortHandler = None
try:
while 1:
try:
handler = self._requestQueue.get()
except Queue.Empty:
continue
if handler is None:
break
try:
t._processing = True
self._threadHandler[t] = handler
try:
handler.handleRequest()
except ThreadAbortedError:
print "Worker thread has been aborted"
except Exception:
print "Exception in worker thread"
traceback.print_exc(file=sys.stderr)
del self._threadHandler[t]
t._processing = False
finally:
handler.close()
while t._abortHandler is handler:
sleep(0.1)
finally:
try:
del self._threadHandler[t]
t._processing = False
except KeyError:
pass
self.delThread()
if debug:
print "Quitting", t
def initThread(self):
"""Initialize thread.
Invoked immediately by threadloop() as a hook for subclasses.
This implementation does nothing and subclasses need not invoke super.
"""
pass
def delThread(self):
"""Delete thread.
Invoked immediately by threadloop() as a hook for subclasses.
This implementation does nothing and subclasses need not invoke super.
"""
pass
def shutDown(self):
"""Called on shutdown.
Also calls `AppServer.shutDown`, but first closes all sockets
and tells all the threads to die.
"""
print "ThreadedAppServer is shutting down..."
if self._running > 2:
self._running = 2
self.awakeSelect()
sys.stdout.flush()
for i in range(30):
if self._running < 2:
break
sleep(0.1)
if self._sockets:
for sock in self._sockets.values():
sock.close()
if self._socketHandlers:
for handler in self._socketHandlers.values():
adrFile = self.addressFileName(handler)
if os.path.exists(adrFile):
try:
os.unlink(adrFile)
except (AttributeError, OSError):
print "Warning: Could not remove", adrFile
for i in range(self._threadCount):
self._requestQueue.put(None)
closeTime = time() + 3
for t in self._threadPool:
timeout = max(0.1, closeTime - time())
try:
t.join(timeout)
except Exception:
pass
for t in self._threadPool:
if t.isAlive():
if debug:
print "Hanging worker thread", t.threadID()
running = True
break
else:
running = False
if running and self._canAbortRequest:
print "Aborting hanging worker threads..."
for t in self._threadPool:
if t.isAlive():
t.abort(ServerShutDownError)
closeTime = time() + 3
for t in self._threadPool:
if t.isAlive():
timeout = max(0.1, closeTime - time())
try:
t.join(timeout)
except Exception:
pass
for t in self._threadPool:
if t.isAlive():
if debug:
print "Warning: Could not abort thread", t.threadID()
else:
print "Warning: Could not abort all worker threads"
break
else:
print "Hanging worker threads have been aborted."
running = False
AppServer.shutDown(self)
def awakeSelect(self):
"""Awake the select() call.
The `select()` in `mainloop()` is blocking, so when
we shut down we have to make a connect to unblock it.
Here's where we do that.
"""
for host, port in self._sockets:
if host == '0.0.0.0':
host = '127.0.0.1'
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((host, port))
sock.close()
except Exception:
pass
def address(self, settingPrefix):
"""Get host address.
The address for the Adapter (Host/interface, and port),
as taken from ``Configs/AppServer.config``,
settings ``Host`` and ``AdapterPort``.
"""
try:
return self._addr[settingPrefix]
except KeyError:
host = self.setting(settingPrefix + 'Host', self.setting('Host'))
port = self.setting(settingPrefix + 'Port')
self._addr[settingPrefix] = (host, port)
return self._addr[settingPrefix]
def addressFileName(self, handlerClass):
"""Get the name of the text file with the server address."""
return self.serverSidePath(
self.setting('AddressFiles') % handlerClass.protocolName)
class Handler(object):
"""A very general socket handler.
Handler is an abstract superclass -- specific protocol implementations
will subclass this. A Handler takes a socket to interact with, and
creates a raw request.
Handlers will be reused. When a socket is received `activate` will be
called -- but the handler should not do anything, as it is still running
in the main thread. The handler is put into a queue, and a worker thread
picks it up and runs `handleRequest`, which subclasses should override.
Several methods are provided which are typically used by subclasses.
"""
def __init__(self, server, serverAddress):
"""Create a new socket handler.
Each handler is attached to a specific host and port,
and of course to the AppServer.
"""
self._server = server
self._serverAddress = serverAddress
self._verbose = server._verbose
self._silentURIs = server._silentURIs
def activate(self, sock, requestID):
"""Activate the handler for processing the request.
`sock` is the incoming socket that this handler will work with,
and `requestID` is a serial number unique for each request.
This isn't where work gets done -- the handler is queued after this,
and work is done when `handleRequest` is called.
"""
self._requestID = requestID
self._sock = sock
def close(self):
"""Close the socket.
Called when the handler is finished. Closes the socket and
returns the handler to the pool of inactive handlers.
"""
self._sock = None
self._server._handlerCache[self._serverAddress].append(self)
def receiveDict(self):
"""Receive a dictionary from the socket.
Utility function to receive a marshalled dictionary from the socket.
Returns None if the request was empty.
"""
chunk = ''
missing = intLength
while missing > 0:
block = self._sock.recv(missing)
if not block:
self._sock.close()
if not chunk:
return None
raise NotEnoughDataError('received only %d of %d bytes'
' when receiving dictLength' % (len(chunk), intLength))
chunk += block
missing -= len(block)
try:
dictLength = loads(chunk)
except (ValueError, EOFError), msg:
if chunk[:3] == 'GET':
while msg and len(chunk) < 8192:
block = self._sock.recv(1)
if not block:
break
chunk += block
if (chunk.endswith('\r\r') or chunk.endswith('\n\n')
or chunk.endswith('\r\n\r\n')):
msg = None
if msg:
print "ERROR:", msg
else:
print "ERROR: HTTP GET from WebKit adapter port."
self._sock.sendall('''\
HTTP/1.0 505 HTTP Version Not Supported\r
Content-Type: text/plain\r
\r
Error: Invalid AppServer protocol.\r
Sorry, I don't speak HTTP. You must connect via an adapter.\r
See the Troubleshooting section of the WebKit Install Guide.\r''')
self._sock.close()
print (" You can only connect to %s via an adapter"
" like mod_webkit or wkcgi." % self._serverAddress[1])
return None
if not isinstance(dictLength, int):
self._sock.close()
raise ProtocolError("Invalid AppServer protocol")
chunk = ''
missing = dictLength
while missing > 0:
block = self._sock.recv(missing)
if not block:
self._sock.close()
raise NotEnoughDataError('received only %d of %d bytes'
' when receiving dict' % (len(chunk), dictLength))
chunk += block
missing -= len(block)
return loads(chunk)
def handleRequest(self):
"""Handle a raw request.
This is where the work gets done. Subclasses should override.
"""
pass
def startRequest(self, requestDict=None):
"""Track start of a raw request.
Subclasses can use and override this method.
"""
requestDict = requestDict or {}
requestID = self._requestID
requestTime = requestDict.get('time') or time()
requestDict['requestID'] = requestID
requestDict['time'] = requestTime
self._requestDict = requestDict
if self._verbose:
env = requestDict.get('environ')
uri = env and requestURI(env) or '-'
if not self._silentURIs or not self._silentURIs.search(uri):
requestDict['verbose'] = True
requestTime = localtime(requestTime)[:6]
print '%5d %4d-%02d-%02d %02d:%02d:%02d %s' % (
(requestID,) + requestTime + (uri,))
def endRequest(self, error=None):
"""Track end of a raw request.
Subclasses can use and override this method.
"""
if self._verbose:
requestDict = self._requestDict
if requestDict.get('verbose'):
requestID = requestDict['requestID']
duration = round((time() - requestDict['time'])*1000)
if not error:
env = requestDict.get('environ')
error = env and requestURI(env) or '-'
print '%5d %14.0f msec %s\n' % (
requestID, duration, error)
class MonitorHandler(Handler):
"""Monitor server status.
Monitor is a minimal service that accepts a simple protocol,
and returns a value indicating the status of the server.
The protocol passes a marshalled dict, much like the Adapter
interface, which looks like ``{'format': 'CMD'}``, where CMD
is a command (``STATUS`` or ``QUIT``). Responds with a simple
string, either the number of requests we've received (for
``STATUS``) or ``OK`` for ``QUIT`` (which also stops the server).
"""
protocolName = 'monitor'
settingPrefix = 'Monitor'
def handleRequest(self):
requestDict = self.receiveDict()
if not requestDict:
return
requestDict['environ'] = {'REQUEST_URI': '*%s %s*'
% (self.settingPrefix, requestDict['format'])}
self.startRequest(requestDict)
conn = self._sock
if requestDict['format'] == "STATUS":
conn.send(str(self._server._requestID))
elif requestDict['format'] == 'QUIT':
conn.send("OK")
conn.close()
self._server.shutDown()
class TASStreamOut(ASStreamOut):
"""Response stream for ThreadedAppServer.
The `TASStreamOut` class streams to a given socket, so that when `flush`
is called and the buffer is ready to be written, it sends the data from the
buffer out on the socket. This is the response stream used for requests
generated by ThreadedAppServer.
"""
_ignoreErrnos = []
for e in 'EPIPE', 'ECONNABORTED', 'ECONNRESET':
try:
_ignoreErrnos.append(getattr(errno, e))
except AttributeError:
pass
def __init__(self, sock, autoCommit=False, bufferSize=8192):
"""Create stream.
We get an extra `sock` argument, which is the socket which we'll
stream output to (if we're streaming).
"""
ASStreamOut.__init__(self, autoCommit, bufferSize)
self._socket = sock
def flush(self):
"""Flush stream.
Calls `ASStreamOut.ASStreamOut.flush`, and if that returns True
(indicating the buffer is full enough) then we send data from
the buffer out on the socket.
"""
result = ASStreamOut.flush(self)
if result:
reslen = len(self._buffer)
sent = 0
bufferSize = self._bufferSize
while sent < reslen:
try:
sent += self._socket.send(
self._buffer[sent:sent+bufferSize])
except socket.error, e:
if debug or e[0] not in self._ignoreErrnos:
print "StreamOut Error:", e
self._closed = True
raise ConnectionAbortedError
self.pop(sent)
class AdapterHandler(Handler):
"""Adapter handler.
Handles the Adapter protocol (as used in mod_webkit, wkcgi,
WebKit.cgi, HTTPAdapter, etc). This protocol passes a marshalled
dictionary which contains the keys ``format`` and ``environ``.
``format`` is currently always the string ``CGI``, and ``environ``
is a dictionary of string: string, with values like those passed
in the environment to a CGI request (QUERY_STRING, HTTP_HOST, etc).
The handler adds one more key, ``input``, which contains a file
object based off the socket, which contains the body of the
request (the POST data, for instance). It's left to Application
to handle that data.
"""
protocolName = 'adapter'
settingPrefix = 'Adapter'
def handleRequest(self):
"""Handle request.
Creates the request dictionary, and creates a `TASStreamOut` object
for the response, then calls `Application.dispatchRawRequest`, which
does the rest of the work (here we just clean up after).
"""
requestDict = self.receiveDict()
if not requestDict:
return
self.startRequest(requestDict)
requestDict['input'] = self.makeInput()
streamOut = TASStreamOut(self._sock,
bufferSize=self._server._responseBufferSize)
transaction = self._server._app.dispatchRawRequest(
requestDict, streamOut)
try:
streamOut.close()
aborted = False
except ConnectionAbortedError:
aborted = True
try:
self._sock.shutdown(1)
self._sock.close()
except Exception:
pass
self.endRequest(aborted and '*connection aborted*')
transaction._application = None
transaction.die()
del transaction
def makeInput(self):
"""Create a file-like object from the socket."""
return self._sock.makefile("rb", self._server._requestBufferSize)
class SCGIHandler(AdapterHandler):
"""SCGI handler.
Modified Adapter handler speaking the SCGI protocol.
"""
protocolName = 'scgi'
settingPrefix = 'SCGI'
def receiveDict(self):
"""Receive a dictionary from the socket.
Utility function to receive the SCGI headers from the socket.
Returns None if the request was empty.
"""
chunk = ''
while 1:
c = self._sock.recv(1)
if not c and not chunk:
self._sock.close()
return None
if c == ':':
break
else:
chunk += c
if len(chunk) > 12:
break
try:
if len(chunk) > 12 or not chunk.isdigit():
raise ValueError('Malformed SCGI netstring')
dictLength = long(chunk)
except ValueError, msg:
if chunk[:3] == 'GET':
while msg and len(chunk) < 8192:
block = self._sock.recv(1)
if not block:
break
chunk += block
if (chunk.endswith('\r\r') or chunk.endswith('\n\n')
or chunk.endswith('\r\n\r\n')):
msg = None
if msg:
print "ERROR:", msg
else:
print "ERROR: HTTP GET from SCGI adapter port."
self._sock.sendall('''\
HTTP/1.0 505 HTTP Version Not Supported\r
Content-Type: text/plain\r
\r
Error: Invalid AppServer protocol.\r
Sorry, I don't speak HTTP. You must connect via an SCGI adapter.\r
See the Troubleshooting section of the WebKit Install Guide.\r''')
self._sock.close()
print (" You can only connect to %s via an adapter"
" like mod_scgi or pyscgi." % self._serverAddress[1])
return None
chunk = ''
missing = dictLength
while missing > 0:
block = self._sock.recv(missing)
if not block:
self._sock.close()
raise NotEnoughDataError('received only %d of %d bytes'
' when receiving netstring' % (len(chunk), dictLength))
chunk += block
missing -= len(block)
if self._sock.recv(1) != ',':
self._sock.close()
raise ProtocolError('Missing SCGI netstring terminator')
items = chunk.split('\0')[:-1]
environ = {}
try:
for i in range(0, len(items), 2):
environ[items[i]] = items[i+1]
except IndexError:
raise ProtocolError('Malformed SCGI headers')
return dict(format='CGI', time=time(), environ=environ)
def runMainLoopInThread():
return os.name == 'nt'
doesRunHandleExceptions = True
class RestartAppServerError(Exception):
"""Raised by DebugAppServer when needed."""
pass
_chdir = os.chdir
def chdir(path, force=False):
"""Execute os.chdir() with safety provision."""
assert force, (
"You cannot reliably use os.chdir() in a threaded environment.\n"
+ 16*" " + "Set force=True if you want to do it anway (using a lock).")
_chdir(path)
def run(workDir=None):
"""Start the server (`ThreadedAppServer`).
`workDir` is the server-side path for the server, which may not be
the ``Webware/WebKit`` directory (though by default it is).
After setting up the ThreadedAppServer we call `ThreadedAppServer.mainloop`
to start the server main loop. It also catches exceptions as a last resort.
"""
global server
server = None
global exitStatus
exitStatus = 0
os.chdir = chdir
runAgain = True
while runAgain:
try:
try:
runAgain = False
server = ThreadedAppServer(workDir)
if runMainLoopInThread():
def _windowsmainloop():
global exitStatus
try:
server.mainloop()
except SystemExit, e:
exitStatus = e[0]
server._running = 2
t = Thread(target=_windowsmainloop)
t.start()
try:
while server._running > 1:
try:
sleep(1)
except Exception:
if server._running < 3:
raise
finally:
t.join()
else:
server.mainloop()
sys.exit(exitStatus)
except RestartAppServerError:
print
print "Restarting AppServer:"
sys.stdout.flush()
sys.stderr.flush()
runAgain = True
except SystemExit, e:
print
print "Exiting AppServer%s." % (
e[0] == 3 and ' for reload' or '')
exitStatus = e[0]
except KeyboardInterrupt:
print
print "Exiting AppServer due to keyboard interrupt."
exitStatus = 0
except Exception, e:
if isinstance(e, IOError) and e[0] == errno.EINTR:
print
print "Exiting AppServer due to interrupt signal."
exitStatus = 0
else:
if doesRunHandleExceptions:
if not server and isinstance(e, ProcessRunning):
print "Error:", str(e)
else:
print
traceback.print_exc()
print
print "Exiting AppServer due to above exception."
exitStatus = 1
else:
raise
finally:
sys.stdout.flush()
sys.stderr.flush()
if server and server._running:
server.initiateShutdown()
server._closeThread.join()
AppServerModule.globalAppServer = None
sys.stdout.flush()
sys.stderr.flush()
os.chdir = _chdir
return exitStatus
def shutDown(signum, frame):
"""Signal handler for shutting down the server."""
print
print "App server has been signaled to shutdown."
if server and server._running > 2:
print "Shutting down at", asclocaltime()
sys.stdout.flush()
server._running = 2
if signum == SIGINT:
raise KeyboardInterrupt
elif signum == SIGHUP:
sys.exit(3)
else:
sys.exit(0)
else:
print "No running app server was found."
try:
currentFrames = sys._current_frames
except AttributeError:
try:
import threadframe
except ImportError:
currentFrames = None
else:
currentFrames = threadframe.dict
def threadDump(signum, frame):
"""Signal handler for dumping thread stack frames to stdout."""
print
print "App server has been signaled to attempt a thread dump."
print
print "Thread stack frame dump at", asclocaltime()
sys.stdout.flush()
frames = currentFrames()
print
print "-" * 79
print
for threadID in sorted(frames):
frame = frames[threadID]
print "Thread ID: %d (reference count = %d)" % (
threadID, sys.getrefcount(frame))
print ''.join(traceback.format_list(traceback.extract_stack(frame)))
print "-" * 79
sys.stdout.flush()
import signal
try:
SIGHUP = signal.SIGHUP
signal.signal(SIGHUP, shutDown)
except AttributeError:
SIGHUP = None
try:
SIGTERM = signal.SIGTERM
signal.signal(SIGTERM, shutDown)
except AttributeError:
SIGTERM = None
try:
SIGINT = signal.SIGINT
signal.signal(SIGINT, shutDown)
except AttributeError:
SIGINT = None
if currentFrames:
try:
SIGQUIT = signal.SIGQUIT
signal.signal(SIGQUIT, threadDump)
except AttributeError:
SIGQUIT = None
try:
SIGBREAK = signal.SIGBREAK
signal.signal(SIGBREAK, threadDump)
except AttributeError:
SIGBREAK = None
import re
settingRE = re.compile(r'^(?:--)?([a-zA-Z][a-zA-Z0-9]*\.[a-zA-Z][a-zA-Z0-9]*)=')
from MiscUtils import Configurable
usage = re.search('\n.* arguments:\n\n(.*\n)*?\n', __doc__).group(0)
def main(args):
"""Command line interface.
Run by `Launch`, this is the main entrance and command-line interface
for ThreadedAppServer.
"""
function = run
daemon = False
workDir = None
for arg in args:
if settingRE.match(arg):
match = settingRE.match(arg)
name = match.group(1)
value = arg[match.end():]
Configurable.addCommandLineSetting(name, value)
elif arg == "stop":
function = AppServerModule.stop
elif arg == "daemon":
daemon = True
elif arg == "start":
pass
elif arg[:8] == "workdir=":
workDir = arg[8:]
else:
print usage
return
if daemon:
if os.name == "posix":
pid = os.fork()
if pid:
sys.exit()
else:
print "Daemon mode not available on your OS."
return function(workDir=workDir)