59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
import grpc
|
|
import demo_pb2
|
|
import demo_pb2_grpc
|
|
from concurrent import futures
|
|
import time
|
|
import random
|
|
import os
|
|
|
|
class RecommendationService(demo_pb2_grpc.RecommendationServiceServicer):
|
|
def ListRecommendations(self, request, context):
|
|
max_responses = 5
|
|
|
|
# fetch list of products from product catalog stub
|
|
cat_response = stub.ListProducts(demo_pb2.Empty())
|
|
num_prodcuts = len(cat_response.products)
|
|
num_return = min(max_responses, num_prodcuts)
|
|
|
|
# sample list of indicies to return
|
|
indices = random.sample(range(num_prodcuts), num_return)
|
|
# fetch product ids from indices
|
|
prod_list = [cat_response.products[i].id for i in indices]
|
|
print("handling request: {}".format(prod_list))
|
|
|
|
# build and return response
|
|
response = demo_pb2.ListRecommendationsResponse()
|
|
response.product_ids.extend(prod_list)
|
|
return response
|
|
|
|
if __name__ == "__main__":
|
|
# get port from $PORT envar
|
|
port = os.environ.get('PORT', "8080")
|
|
# get product catalog service address from $PRODUCT_CATALOG_SERVICE_ADDR envar
|
|
catalog_addr = os.environ.get('PRODUCT_CATALOG_SERVICE_ADDR', '')
|
|
if catalog_addr == "":
|
|
raise Exception('PRODUCT_CATALOG_SERVICE_ADDR environment not set')
|
|
|
|
print("product catalog address: " + catalog_addr)
|
|
print("listening on port: " + port)
|
|
|
|
# stub for product catalog service
|
|
channel = grpc.insecure_channel(catalog_addr)
|
|
stub = demo_pb2_grpc.ProductCatalogServiceStub(channel)
|
|
|
|
# create gRPC server
|
|
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
|
|
|
|
# add class to gRPC server
|
|
demo_pb2_grpc.add_RecommendationServiceServicer_to_server(RecommendationService(), server)
|
|
|
|
# start server
|
|
server.add_insecure_port('[::]:'+port)
|
|
server.start()
|
|
|
|
# keep alive
|
|
try:
|
|
while True:
|
|
time.sleep(10000)
|
|
except KeyboardInterrupt:
|
|
server.stop(0)
|