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recommendation_server.py
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recommendation_server.py
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#!/usr/bin/python
#
# Copyright 2018 Google LLC
#
# 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 os
import random
import time
import traceback
from concurrent import futures
import googleclouddebugger
import googlecloudprofiler
from google.auth.exceptions import DefaultCredentialsError
import grpc
from opencensus.trace.exporters import print_exporter
from opencensus.trace.exporters import stackdriver_exporter
from opencensus.trace.ext.grpc import server_interceptor
from opencensus.common.transports.async_ import AsyncTransport
from opencensus.trace.samplers import always_on
import demo_pb2
import demo_pb2_grpc
from grpc_health.v1 import health_pb2
from grpc_health.v1 import health_pb2_grpc
from logger import getJSONLogger
logger = getJSONLogger('recommendationservice-server')
def initStackdriverProfiling():
project_id = None
try:
project_id = os.environ["GCP_PROJECT_ID"]
except KeyError:
# Environment variable not set
pass
for retry in range(1,4):
try:
if project_id:
googlecloudprofiler.start(service='recommendation_server', service_version='1.0.0', verbose=0, project_id=project_id)
else:
googlecloudprofiler.start(service='recommendation_server', service_version='1.0.0', verbose=0)
logger.info("Successfully started Stackdriver Profiler.")
return
except (BaseException) as exc:
logger.info("Unable to start Stackdriver Profiler Python agent. " + str(exc))
if (retry < 4):
logger.info("Sleeping %d seconds to retry Stackdriver Profiler agent initialization"%(retry*10))
time.sleep (1)
else:
logger.warning("Could not initialize Stackdriver Profiler after retrying, giving up")
return
class RecommendationService(demo_pb2_grpc.RecommendationServiceServicer):
def ListRecommendations(self, request, context):
max_responses = 5
# fetch list of products from product catalog stub
cat_response = product_catalog_stub.ListProducts(demo_pb2.Empty())
product_ids = [x.id for x in cat_response.products]
filtered_products = list(set(product_ids)-set(request.product_ids))
num_products = len(filtered_products)
num_return = min(max_responses, num_products)
# sample list of indicies to return
indices = random.sample(range(num_products), num_return)
# fetch product ids from indices
prod_list = [filtered_products[i] for i in indices]
logger.info("[Recv ListRecommendations] product_ids={}".format(prod_list))
# build and return response
response = demo_pb2.ListRecommendationsResponse()
response.product_ids.extend(prod_list)
return response
def Check(self, request, context):
return health_pb2.HealthCheckResponse(
status=health_pb2.HealthCheckResponse.SERVING)
def Watch(self, request, context):
return health_pb2.HealthCheckResponse(
status=health_pb2.HealthCheckResponse.UNIMPLEMENTED)
if __name__ == "__main__":
logger.info("initializing recommendationservice")
try:
if "DISABLE_PROFILER" in os.environ:
raise KeyError()
else:
logger.info("Profiler enabled.")
initStackdriverProfiling()
except KeyError:
logger.info("Profiler disabled.")
try:
if "DISABLE_TRACING" in os.environ:
raise KeyError()
else:
logger.info("Tracing enabled.")
sampler = always_on.AlwaysOnSampler()
exporter = stackdriver_exporter.StackdriverExporter(
project_id=os.environ.get('GCP_PROJECT_ID'),
transport=AsyncTransport)
tracer_interceptor = server_interceptor.OpenCensusServerInterceptor(sampler, exporter)
except (KeyError, DefaultCredentialsError):
logger.info("Tracing disabled.")
tracer_interceptor = server_interceptor.OpenCensusServerInterceptor()
try:
if "DISABLE_DEBUGGER" in os.environ:
raise KeyError()
else:
logger.info("Debugger enabled.")
try:
googleclouddebugger.enable(
module='recommendationserver',
version='1.0.0'
)
except (Exception, DefaultCredentialsError):
logger.error("Could not enable debugger")
logger.error(traceback.print_exc())
pass
except (Exception, DefaultCredentialsError):
logger.info("Debugger disabled.")
port = os.environ.get('PORT', "8080")
catalog_addr = os.environ.get('PRODUCT_CATALOG_SERVICE_ADDR', '')
if catalog_addr == "":
raise Exception('PRODUCT_CATALOG_SERVICE_ADDR environment variable not set')
logger.info("product catalog address: " + catalog_addr)
channel = grpc.insecure_channel(catalog_addr)
product_catalog_stub = demo_pb2_grpc.ProductCatalogServiceStub(channel)
# create gRPC server
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10),
interceptors=(tracer_interceptor,))
# add class to gRPC server
service = RecommendationService()
demo_pb2_grpc.add_RecommendationServiceServicer_to_server(service, server)
health_pb2_grpc.add_HealthServicer_to_server(service, server)
# start server
logger.info("listening on port: " + port)
server.add_insecure_port('[::]:'+port)
server.start()
# keep alive
try:
while True:
time.sleep(10000)
except KeyboardInterrupt:
server.stop(0)