# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
#
# 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.
import threading
import time
from .api_spec import ServiceFinder
[docs]class RRServiceFinder(ServiceFinder):
def __init__(self, change_interval, host1: str, port1: int, host2: str, port2: int):
self.host1 = host1
self.port1 = port1
self.host2 = host2
self.port2 = port2
self.change_interval = change_interval
self.thread = None
self.stop_asked = False
[docs] def start(self, service_address_changed_cb):
self.thread = threading.Thread(target=self._gen_address, args=(service_address_changed_cb,), daemon=True)
self.thread.start()
def _gen_address(self, service_address_changed_cb):
last_port = self.port1
last_change_time = None
while True:
if self.stop_asked:
return
if not last_change_time or time.time() - last_change_time >= self.change_interval:
last_change_time = time.time()
if last_port == self.port1:
h = self.host2
p = self.port2
else:
h = self.host1
p = self.port1
service_address_changed_cb(h, p, "1234")
last_port = p
time.sleep(0.2)
[docs] def stop(self):
self.stop_asked = True
if self.thread and self.thread.is_alive():
self.thread.join()
print("Service finder stopped")