def __handle_validate(self, args):
"""Handle 'validate' command.
Command arguments are the same 'load' except the last one:
'action': callable without any parameter itself, encapsulating
any segment-specific validation logic. It returns
a result of the validation.
This method simply calls the passed action, and returns the result
back to the memmgr with other command arguments. This is run in
the builder thread simply because it may take time.
"""
_, dsrc_info, rrclass, dsrc_name, action = args
logger.debug(logger.DBGLVL_TRACE_BASIC,
LIBMEMMGR_BUILDER_SEGMENT_VALIDATE, dsrc_name, rrclass)
try:
result = action()
except Exception as ex:
logger.error(LIBMEMMGR_BUILDER_SEGMENT_VALIDATE_FAIL, dsrc_name,
rrclass, ex)
result = False
self.__send_response(('validate-completed', dsrc_info, rrclass,
dsrc_name, result))
def __handle_validate(self, args):
"""Handle 'validate' command.
Command arguments are the same 'load' except the last one:
'action': callable without any parameter itself, encapsulating
any segment-specific validation logic. It returns
a result of the validation.
This method simply calls the passed action, and returns the result
back to the memmgr with other command arguments. This is run in
the builder thread simply because it may take time.
"""
_, dsrc_info, rrclass, dsrc_name, action = args
logger.debug(logger.DBGLVL_TRACE_BASIC,
LIBMEMMGR_BUILDER_SEGMENT_VALIDATE, dsrc_name, rrclass)
try:
result = action()
except Exception as ex:
logger.error(LIBMEMMGR_BUILDER_SEGMENT_VALIDATE_FAIL, dsrc_name,
rrclass, ex)
result = False
self.__send_response(('validate-completed', dsrc_info, rrclass,
dsrc_name, result))
def run(self):
""" This is the method invoked when the builder thread is
started. In this thread, be careful when modifying
variables passed-by-reference in the constructor. If they
are reassigned, they will not refer to the main thread's
objects any longer. Any use of command_queue and
response_queue must be synchronized by acquiring the lock in
the condition variable. This method must normally terminate
only when the 'shutdown' command is sent to it.
"""
while not self._shutdown:
with self._cv:
# Unless we've peeked and moved new commands in
# __cmd_canceled(), wait for new one from the parent thread.
if not self.__local_command_queue:
while not self._command_queue:
self._cv.wait()
# Move the queue content to a local queue. Be careful of
# not making assignments to reference variables.
self.__local_command_queue.extend(self._command_queue[:])
del self._command_queue[:]
# Filter out commands that don't have to be executed.
local_command_queue = \
self._handle_cancels(self.__local_command_queue)
del self.__local_command_queue[:]
# Run commands passed in the command queue sequentially
# in the given order. For now, it only supports the
# "shutdown" command, which just exits the thread.
for command_tuple in local_command_queue:
command = command_tuple[0]
logger.debug(logger.DBGLVL_TRACE_BASIC,
LIBMEMMGR_BUILDER_RECEIVED_COMMAND, command)
if command == 'validate':
self.__handle_validate(command_tuple)
elif command == 'load':
# See the comments for _handle_load() for
# details of the tuple passed to the "load"
# command.
_, zone_name, dsrc_info, rrclass, dsrc_name = \
command_tuple
self._handle_load(zone_name, dsrc_info, rrclass,
dsrc_name)
elif command == 'shutdown':
self.__handle_shutdown()
# When the shutdown command is received, we do
# not process any further commands.
break
elif command == 'cancel':
# _handle_cancels() has done most of the work. we can
# simply report it's completed.
self.__send_response(('cancel-completed', command_tuple[1]))
else:
self.__handle_bad_command(command)
# When a bad command is received, we do not
# process any further commands.
break
def __reset_segment(self, clist, dsrc_name, rrclass, params):
try:
clist.reset_memory_segment(dsrc_name,
ConfigurableClientList.READ_WRITE,
params)
logger.debug(logger.DBGLVL_TRACE_BASIC,
LIBMEMMGR_BUILDER_SEGMENT_RESET, dsrc_name, rrclass)
return self.__RESET_SEGMENT_OK
except Exception as ex:
logger.error(LIBMEMMGR_BUILDER_RESET_SEGMENT_ERROR, dsrc_name,
rrclass, ex)
try:
clist.reset_memory_segment(dsrc_name, ConfigurableClientList.CREATE,
params)
logger.info(LIBMEMMGR_BUILDER_SEGMENT_CREATED, dsrc_name, rrclass)
return self.__RESET_SEGMENT_CREATED
except Exception as ex:
logger.error(LIBMEMMGR_BUILDER_SEGMENT_CREATE_ERROR, dsrc_name,
rrclass, ex)
return self.__RESET_SEGMENT_FAILED
def __reset_segment(self, clist, dsrc_name, rrclass, params):
try:
clist.reset_memory_segment(dsrc_name,
ConfigurableClientList.READ_WRITE,
params)
logger.debug(logger.DBGLVL_TRACE_BASIC,
LIBMEMMGR_BUILDER_SEGMENT_RESET, dsrc_name, rrclass)
return self.__RESET_SEGMENT_OK
except Exception as ex:
logger.error(LIBMEMMGR_BUILDER_RESET_SEGMENT_ERROR, dsrc_name,
rrclass, ex)
try:
clist.reset_memory_segment(dsrc_name, ConfigurableClientList.CREATE,
params)
logger.info(LIBMEMMGR_BUILDER_SEGMENT_CREATED, dsrc_name, rrclass)
return self.__RESET_SEGMENT_CREATED
except Exception as ex:
logger.error(LIBMEMMGR_BUILDER_SEGMENT_CREATE_ERROR, dsrc_name,
rrclass, ex)
return self.__RESET_SEGMENT_FAILED
