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First preparations for moving webserver to Server process.

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This commit is contained in:
Griatch 2013-05-22 18:18:50 +02:00
parent 60068771c7
commit 76fa0059ea
3 changed files with 48 additions and 27 deletions
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45
src/utils/idmapper/base.py
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@ -7,10 +7,12 @@ leave caching unexpectedly (no use if WeakRefs).
Also adds cache_size() for monitoring the size of the cache.
"""
import os
import os, threading
from twisted.internet import reactor
from twisted.internet.reactor import callFromThread
from twisted.internet.threads import blockingCallFromThread
from django.db.models.base import Model, ModelBase
from django.db.models.signals import post_save, pre_delete, \
post_syncdb
from django.db.models.signals import post_save, pre_delete, post_syncdb
from manager import SharedMemoryManager
@ -37,11 +39,19 @@ def _get_pids():
if server_pid and portal_pid:
return int(server_pid), int(portal_pid)
return None, None
_SELF_PID = os.getpid()
_SERVER_PID = None
_PORTAL_PID = None
_IS_SUBPROCESS = False
# get info about the current process and thread
_SELF_PID = os.getpid()
_SERVER_PID, _PORTAL_PID = _get_pids()
_IS_SUBPROCESS = (_SERVER_PID and _PORTAL_PID) and not _SELF_PID in (_SERVER_PID, _PORTAL_PID)
_IS_MAIN_THREAD = threading.currentThread().getName() == "MainThread"
#_SERVER_PID = None
#_PORTAL_PID = None
# #global _SERVER_PID, _PORTAL_PID, _IS_SUBPROCESS, _SELF_PID
# if not _SERVER_PID and not _PORTAL_PID:
# _IS_SUBPROCESS = (_SERVER_PID and _PORTAL_PID) and not _SELF_PID in (_SERVER_PID, _PORTAL_PID)
class SharedMemoryModelBase(ModelBase):
# CL: upstream had a __new__ method that skipped ModelBase's __new__ if
@ -158,15 +168,22 @@ class SharedMemoryModel(Model):
flush_instance_cache = classmethod(flush_instance_cache)
def save(cls, *args, **kwargs):
"overload spot for saving"
global _SERVER_PID, _PORTAL_PID, _IS_SUBPROCESS, _SELF_PID
if not _SERVER_PID and not _PORTAL_PID:
_SERVER_PID, _PORTAL_PID = _get_pids()
_IS_SUBPROCESS = (_SERVER_PID and _PORTAL_PID) and (_SERVER_PID != _SELF_PID) and (_PORTAL_PID != _SELF_PID)
"save tracking process/thread issues"
if _IS_SUBPROCESS:
#print "storing in PROC_MODIFIED_OBJS:", cls.db_key, cls.id
# we keep a store of objects modified in subprocesses so
# we know to update their caches in the central process
PROC_MODIFIED_OBJS.append(cls)
super(SharedMemoryModel, cls).save(*args, **kwargs)
if _IS_MAIN_THREAD:
# in main thread - normal operation
super(SharedMemoryModel, cls).save(*args, **kwargs)
else:
# in another thread; make sure to save in reactor thread
def _save_callback(cls, *args, **kwargs):
super(SharedMemoryModel, cls).save(*args, **kwargs)
blockingCallFromThread(reactor, _save_callback, cls, *args, **kwargs)
#callFromThread(_save_callback, cls, *args, **kwargs)
# Use a signal so we make sure to catch cascades.
def flush_cache(**kwargs):