| # |
| # Copyright 2017 the original author or authors. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| """ |
| The gRPC client layer for the OpenFlow agent |
| """ |
| from Queue import Queue, Empty |
| import os |
| import uuid |
| |
| from grpc import StatusCode |
| from grpc._channel import _Rendezvous |
| from structlog import get_logger |
| from twisted.internet import reactor |
| from twisted.internet import threads |
| from twisted.internet.defer import inlineCallbacks, returnValue, DeferredQueue |
| |
| from voltha_protos.voltha_pb2_grpc import VolthaServiceStub |
| from voltha_protos.voltha_pb2 import ID, FlowTableUpdate, \ |
| FlowGroupTableUpdate, PacketOut |
| from voltha_protos.logical_device_pb2 import LogicalPortId |
| from google.protobuf import empty_pb2 |
| |
| |
| log = get_logger() |
| |
| |
| class GrpcClient(object): |
| |
| def __init__(self, connection_manager, channel, grpc_timeout, core_binding_key, core_transaction_key): |
| |
| self.connection_manager = connection_manager |
| self.channel = channel |
| self.grpc_timeout = grpc_timeout |
| self.grpc_stub = VolthaServiceStub(channel) |
| |
| # This is the rw-core cluster to which an OFAgent is bound. |
| # It is the affinity router that forwards all OFAgent |
| # requests to a specific rw-core in this back-end cluster. |
| self.core_group_id = '' |
| self.core_group_id_key = core_binding_key |
| |
| # Since the api-router binds an OFAgent to two RW Cores in a pair and |
| # transparently forward requests between the two then the onus is on |
| # the OFAgent to fulfill part of the function of the api-server which |
| # involves sending a transaction key to both RW Cores for the latter |
| # to figure out which Core will handle the transaction. To prevent |
| # collision between the api-server ID and the one from OFAgent then the |
| # OFAgent ID will be prefixed with "O-". |
| self.core_transaction_key = core_transaction_key |
| |
| self.stopped = False |
| |
| self.packet_out_queue = Queue() # queue to send out PacketOut msgs |
| self.packet_in_queue = DeferredQueue() # queue to receive PacketIn |
| self.change_event_queue = DeferredQueue() # queue change events |
| |
| def start(self): |
| log.debug('starting', grpc_timeout=self.grpc_timeout, |
| core_binding_key=self.core_group_id_key, |
| core_transaction_key=self.core_transaction_key) |
| self.start_packet_out_stream() |
| self.start_packet_in_stream() |
| self.start_change_event_in_stream() |
| reactor.callLater(0, self.packet_in_forwarder_loop) |
| reactor.callLater(0, self.change_event_processing_loop) |
| log.info('started') |
| return self |
| |
| def stop(self): |
| log.debug('stopping') |
| self.stopped = True |
| log.info('stopped') |
| |
| def get_core_transaction_metadata(self): |
| return (self.core_transaction_key, "O-" + uuid.uuid4().hex) |
| |
| def start_packet_out_stream(self): |
| |
| def packet_generator(): |
| while 1: |
| try: |
| packet = self.packet_out_queue.get(block=True, timeout=1.0) |
| except Empty: |
| if self.stopped: |
| return |
| else: |
| yield packet |
| |
| def stream_packets_out(): |
| generator = packet_generator() |
| try: |
| self.grpc_stub.StreamPacketsOut(generator, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| except _Rendezvous, e: |
| log.error('grpc-exception', status=e.code()) |
| if e.code() == StatusCode.UNAVAILABLE: |
| os.system("kill -15 {}".format(os.getpid())) |
| |
| reactor.callInThread(stream_packets_out) |
| |
| def start_packet_in_stream(self): |
| |
| def receive_packet_in_stream(): |
| streaming_rpc_method = self.grpc_stub.ReceivePacketsIn |
| iterator = streaming_rpc_method(empty_pb2.Empty(), |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| try: |
| for packet_in in iterator: |
| reactor.callFromThread(self.packet_in_queue.put, |
| packet_in) |
| log.debug('enqueued-packet-in', |
| packet_in=packet_in, |
| queue_len=len(self.packet_in_queue.pending)) |
| except _Rendezvous, e: |
| log.error('grpc-exception', status=e.code()) |
| if e.code() == StatusCode.UNAVAILABLE: |
| os.system("kill -15 {}".format(os.getpid())) |
| |
| reactor.callInThread(receive_packet_in_stream) |
| |
| def start_change_event_in_stream(self): |
| |
| def receive_change_events(): |
| streaming_rpc_method = self.grpc_stub.ReceiveChangeEvents |
| iterator = streaming_rpc_method(empty_pb2.Empty(), |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| try: |
| for event in iterator: |
| reactor.callFromThread(self.change_event_queue.put, event) |
| log.debug('enqueued-change-event', |
| change_event=event, |
| queue_len=len(self.change_event_queue.pending)) |
| except _Rendezvous, e: |
| log.error('grpc-exception', status=e.code()) |
| if e.code() == StatusCode.UNAVAILABLE: |
| os.system("kill -15 {}".format(os.getpid())) |
| |
| reactor.callInThread(receive_change_events) |
| |
| @inlineCallbacks |
| def change_event_processing_loop(self): |
| while True: |
| try: |
| event = yield self.change_event_queue.get() |
| device_id = event.id |
| self.connection_manager.forward_change_event(device_id, event) |
| except Exception, e: |
| log.exception('failed-in-packet-in-handler', e=e) |
| if self.stopped: |
| break |
| |
| @inlineCallbacks |
| def packet_in_forwarder_loop(self): |
| while True: |
| packet_in = yield self.packet_in_queue.get() |
| device_id = packet_in.id |
| ofp_packet_in = packet_in.packet_in |
| self.connection_manager.forward_packet_in(device_id, ofp_packet_in) |
| if self.stopped: |
| break |
| |
| def send_packet_out(self, device_id, packet_out): |
| packet_out = PacketOut(id=device_id, packet_out=packet_out) |
| self.packet_out_queue.put(packet_out) |
| |
| @inlineCallbacks |
| def get_port(self, device_id, port_id): |
| req = LogicalPortId(id=device_id, port_id=port_id) |
| res = yield threads.deferToThread( |
| self.grpc_stub.GetLogicalDevicePort, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res) |
| |
| @inlineCallbacks |
| def get_port_list(self, device_id): |
| req = ID(id=device_id) |
| res = yield threads.deferToThread( |
| self.grpc_stub.ListLogicalDevicePorts, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res.items) |
| |
| @inlineCallbacks |
| def enable_port(self, device_id, port_id): |
| req = LogicalPortId( |
| id=device_id, |
| port_id=port_id |
| ) |
| res = yield threads.deferToThread( |
| self.grpc_stub.EnableLogicalDevicePort, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res) |
| |
| @inlineCallbacks |
| def disable_port(self, device_id, port_id): |
| req = LogicalPortId( |
| id=device_id, |
| port_id=port_id |
| ) |
| res = yield threads.deferToThread( |
| self.grpc_stub.DisableLogicalDevicePort, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res) |
| |
| @inlineCallbacks |
| def get_device_info(self, device_id): |
| req = ID(id=device_id) |
| res = yield threads.deferToThread( |
| self.grpc_stub.GetLogicalDevice, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res) |
| |
| @inlineCallbacks |
| def update_flow_table(self, device_id, flow_mod): |
| req = FlowTableUpdate( |
| id=device_id, |
| flow_mod=flow_mod |
| ) |
| res = yield threads.deferToThread( |
| self.grpc_stub.UpdateLogicalDeviceFlowTable, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res) |
| |
| @inlineCallbacks |
| def update_group_table(self, device_id, group_mod): |
| req = FlowGroupTableUpdate( |
| id=device_id, |
| group_mod=group_mod |
| ) |
| res = yield threads.deferToThread( |
| self.grpc_stub.UpdateLogicalDeviceFlowGroupTable, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res) |
| |
| @inlineCallbacks |
| def list_flows(self, device_id): |
| req = ID(id=device_id) |
| res = yield threads.deferToThread( |
| self.grpc_stub.ListLogicalDeviceFlows, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res.items) |
| |
| @inlineCallbacks |
| def list_groups(self, device_id): |
| req = ID(id=device_id) |
| res = yield threads.deferToThread( |
| self.grpc_stub.ListLogicalDeviceFlowGroups, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res.items) |
| |
| @inlineCallbacks |
| def list_ports(self, device_id): |
| req = ID(id=device_id) |
| res = yield threads.deferToThread( |
| self.grpc_stub.ListLogicalDevicePorts, req, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res.items) |
| |
| @inlineCallbacks |
| def list_logical_devices(self): |
| res = yield threads.deferToThread( |
| self.grpc_stub.ListLogicalDevices, empty_pb2.Empty(), timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returnValue(res.items) |
| |
| @inlineCallbacks |
| def subscribe(self, subscriber): |
| res, call = yield threads.deferToThread( |
| self.grpc_stub.Subscribe.with_call, subscriber, timeout=self.grpc_timeout, |
| metadata=((self.core_group_id_key, self.core_group_id), |
| self.get_core_transaction_metadata(),)) |
| returned_metadata = call.initial_metadata() |
| |
| # Update the core_group_id if present in the returned metadata |
| if returned_metadata is None: |
| log.debug('header-metadata-missing') |
| else: |
| log.debug('metadata-returned', metadata=returned_metadata) |
| for pair in returned_metadata: |
| if pair[0] == self.core_group_id_key: |
| self.core_group_id = pair[1] |
| log.debug('core-binding', core_group=self.core_group_id) |
| returnValue(res) |