/
flowbase.py
96 lines (87 loc) · 3.67 KB
/
flowbase.py
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'''
Created on 2016/4/11
:author: hubo
'''
from vlcp.server.module import Module, api, call_api, ModuleLoadStateChanged
from vlcp.event.runnable import RoutineContainer
from vlcp.service.sdn.ofpmanager import TableAcquireUpdate
from vlcp.event.core import QuitException
class FlowBase(Module):
# Table request should be list of (name, (ancester, ancester,...), pathname). For default path, pathname = ''
_tablerequest = ()
# Default binding to OpenFlow vHosts
_default_vhostbind = [""]
autosuccess = False
def __init__(self, server):
Module.__init__(self, server)
self._tableacquire_routine = RoutineContainer(self.scheduler)
self._tableacquire_routine.main = self._acquiretable
self.routines.append(self._tableacquire_routine)
self.createAPI(api(self.gettablerequest))
def _gettableindex(self, name, vhost = ""):
vs = [v for k,v in self._all_tables[vhost] if k == name]
if not vs:
raise KeyError(name)
else:
return vs[0]
def _getnexttable(self, pathname, name = None, default = KeyError, vhost = ""):
if pathname not in self._path_tables[vhost]:
if default is KeyError:
raise KeyError(pathname)
else:
return default
else:
pathtable = self._path_tables[vhost][pathname]
for i in range(0, len(pathtable) - 1):
if pathtable[i][0] == name:
return pathtable[i+1][1]
if default is KeyError:
raise KeyError(name)
else:
return default
def table_acquired(self):
pass
async def _acquiretable(self):
try:
if not self._tablerequest:
return
def update_table(event):
self._all_tables = dict((v,r[0]) for v,r in event.result.items())
self._path_tables = dict((v, r[1]) for v,r in event.result.items())
self.table_acquired()
await call_api(self._tableacquire_routine, 'openflowmanager', 'acquiretable', {'modulename': self.getServiceName()})
table_update = TableAcquireUpdate.createMatcher()
try:
while True:
ev = await table_update
if hasattr(ev, 'exception'):
raise ev.exception
elif not ev.result:
continue
else:
update_table(ev)
break
except Exception as exc:
await self.changestate(ModuleLoadStateChanged.FAILED, self._tableacquire_routine)
raise exc
else:
await self.changestate(ModuleLoadStateChanged.SUCCEEDED, self._tableacquire_routine)
while True:
ev = await table_update
if hasattr(ev, 'exception'):
# Ignore a failed table acquire
continue
elif not ev.result:
await call_api(self._tableacquire_routine, 'openflowmanager', 'acquiretable', {'modulename': self.getServiceName()})
else:
update_table(ev)
finally:
async def unacquire():
try:
await call_api(self._tableacquire_routine, 'openflowmanager', 'unacquiretable', {'modulename': self.getServiceName()})
except QuitException:
pass
self._tableacquire_routine.subroutine(unacquire(), False)
def gettablerequest(self):
"Table requirement for this module"
return (self._tablerequest, self.vhostbind)