我试图查看是否可以在单个GRPC服务器上运行同一服务的不同实例,但是看来我无法这样做。所以我想知道我的测试是否做错了什么,还是根本不可能做?
我的测试基于来自grpc仓库的examples/python/multiplex:
服务:
class _GreeterServicer(helloworld_pb2_grpc.GreeterServicer):
def __init__(self, greeter):
self.greeter = greeter
def SayHello(self, request, context):
return helloworld_pb2.HelloReply(
message='Hello, {}! This is {}!'.format(request.name, self.greeter))
服务器:
def serve():
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
helloworld_pb2_grpc.add_GreeterServicer_to_server(_GreeterServicer("John"),
server)
helloworld_pb2_grpc.add_GreeterServicer_to_server(_GreeterServicer("Jim"),
server)
server.add_insecure_port('[::]:50051')
server.start()
server.wait_for_termination()
客户:
def run():
for _ in range(10):
with grpc.insecure_channel('localhost:50051') as channel:
greeter_stub = helloworld_pb2_grpc.GreeterStub(channel)
greeter_response = greeter_stub.SayHello(
helloworld_pb2.HelloRequest(name='you'))
print("Greeter client received: " + greeter_response.message)
由于我为每次迭代都打开了一个新通道,所以我期望得到的输出是“你好,你!我是吉姆!”和“你好,你!我是约翰!”,但我只知道:
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
Greeter client received: Hello, you! This is John!
,即我添加到服务器的GreeterServicer的第一个服务,它应该忽略了第二个servicer实例。
所以,我的问题是,是否可以在单个服务器上进行类似的操作,是否有最佳实践来处理这样的场景,即我想要两个参数完全相同但参数不同的服务(例如,不同的grpc服务器?表示两个实例之间的负载平衡)。
在我的特定情况下,要传递的参数是要在服务实现中使用的一些凭据,然后我的目标是让这两个相同的服务同时运行,以便最终用户不知道有多个实例。
答案 0 :(得分:1)
gRPC-Go实现显式禁止在grpc.Server对象上多次注册同一服务。 Code
我对Python的实现不是很熟悉,但是我认为它也做了类似的事情。对add_GreeterServicer_to_server
的调用是否返回状态或错误?