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from torch.utils.data import communication
class Protocol(object):
__slots__ = ('request_queue', 'response_queue')
def __init__(self, request_queue, response_queue):
self.request_queue = request_queue
self.response_queue = response_queue
class ProtocolClient(Protocol):
"""
ProtocolClient takes charge of putting requests into req_queue and returning results from res_queue.
"""
_req_sent = None
def __init__(self, request_queue, response_queue):
self.request_queue = request_queue
self.response_queue = response_queue
self._req_sent = None
def can_take_request(self):
return self._req_sent is None
def waiting_for_response(self):
return self._req_sent is not None
def request_sent(self, request=True):
if not self.can_take_request():
raise Exception('Protocol only supports one request in the Queue')
self._req_sent = request
def request_served(self, result=None):
if not self.waiting_for_response():
raise Exception(
'Expected no peding requests, but something got served', result)
self._req_sent = None
class ProtocolServer(Protocol):
"""
ProtocolServer takes charge of getting requests from req_queue and fetching data from source datapipe.
"""
_req_received = None
def __init__(self, request_queue, response_queue):
self.request_queue = request_queue
self.response_queue = response_queue
self._req_received = None
def have_pending_request(self):
return self._req_received is not None
def get_new_request(self, block=False):
if self.have_pending_request():
raise Exception(
'Trying to get next request, while having one unserved')
try:
response = self.request_queue.get(block=block)
except Exception as e: # TODO: Catch only timeout exceptions
raise EmptyQueue('queue is empty')
self._req_received = response
return response
# TODO: Validate supported requests
def response_terminate(self):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
if not isinstance(self._req_received, communication.messages.TerminateRequest):
raise Exception(
"Replaying with terminate status to other type of message")
self.response_queue.put(communication.messages.TerminateResponse())
self._req_received = None
class MapDataPipeQueueProtocolServer(ProtocolServer):
def response_item(self, key, value):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
self.response_queue.put(communication.messages.GetItemResponse(key, value))
self._req_received = None
def response_len(self, size):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
self.response_queue.put(communication.messages.LenResponse(size))
self._req_received = None
def response_index_out_of_bound(self):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
self.response_queue.put(communication.messages.StopIterationResponse())
self._req_received = None
class MapDataPipeQueueProtocolClient(ProtocolClient):
def request_len(self):
if not self.can_take_request():
raise Exception('Can not request len while we are still waiting response for previous request')
request = communication.messages.LenRequest()
self.request_queue.put(request)
self.request_sent(request)
def request_item(self, index):
if not self.can_take_request():
raise Exception('Can not request item while we are still waiting response for previous request')
request = communication.messages.GetItemRequest(index)
self.request_queue.put(request)
self.request_sent(request)
def get_response_len(self, block=False, timeout=None):
if not self.waiting_for_response():
raise Exception('Can not expect any response without submitted request')
try:
response = self.response_queue.get(block=block, timeout=timeout)
except TimeoutError:
raise EmptyQueue('queue is empty')
self.request_served(response)
if not isinstance(response, communication.messages.LenResponse):
raise Exception('Invalid response received')
return response
def get_response_item(self, block=False, timeout=None):
if not self.waiting_for_response():
raise Exception('Can not expect any response without submitted request')
try:
response = self.response_queue.get(block=block, timeout=timeout)
except TimeoutError:
raise EmptyQueue('queue is empty')
self.request_served(response)
# if not isinstance(response, communication.messages.GetItemResponse):
# raise Exception('Invalid response received')
return response
class EmptyQueue(Exception):
pass
class IterDataPipeQueueProtocolServer(ProtocolServer):
def response_reset_iterator(self):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
if not isinstance(self._req_received, communication.messages.ResetIteratorRequest):
raise Exception(
"Replaying with reset status to other type of message")
self.response_queue.put(communication.messages.ResetIteratorResponse())
self._req_received = None
def response_next(self, value):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
self.response_queue.put(communication.messages.GetNextResponse(value))
self._req_received = None
def response_stop_iteration(self):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
self.response_queue.put(communication.messages.StopIterationResponse())
self._req_received = None
def response_invalid_state(self):
if not self.have_pending_request():
raise Exception("Attempting to reply with pending request")
self.response_queue.put(communication.messages.InvalidStateResponse())
self._req_received = None
class IterDataPipeQueueProtocolClient(ProtocolClient):
def request_reset_iterator(self):
if not self.can_take_request():
raise Exception('Can not reset while we are still waiting response for previous request')
request = communication.messages.ResetIteratorRequest()
self.request_queue.put(request)
self.request_sent(request)
def request_next(self):
if not self.can_take_request():
raise Exception('Can not request next item while we are still waiting response for previous request')
request = communication.messages.GetNextRequest()
self.request_queue.put(request)
self.request_sent(request)
def get_response_reset_iterator(self, block=False):
try:
response = self.response_queue.get(block=block)
except Exception as e: # TODO: Catch only timeout exceptions
raise EmptyQueue('queue is empty')
self.request_served(response)
if not isinstance(response, communication.messages.ResetIteratorResponse):
raise Exception('Invalid response received')
def get_response_next(self, block=False, timeout=None):
if not self.waiting_for_response():
raise Exception(
'Can not expect any response without submitted request')
try:
response = self.response_queue.get(block=block, timeout=timeout)
except Exception as e: # TODO: Catch only timeout exceptions
raise EmptyQueue('queue is empty')
self.request_served(response)
# TODO(VitalyFedyunin): Add possible response types validation here
return response
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