如何从 python gRPC 客户端访问尾随元数据

Question

这是我从服务器发送元数据的方式。

def DoSomething(self, request, context):
    response = detection2g_pb2.SomeResponse()
    response.message = 'done'
    _SERVER_TRAILING_METADATA = (
                                ('method_status', '1010'),
                                    ('error', 'No Error')
                                )
    context.set_trailing_metadata(_SERVER_TRAILING_METADATA)

    return response

这是我尝试过的：

res = _stub.DoSomething(req) 
    print (res.trailing_metadata())

在这种情况下，我得到属性错误对象没有属性 'trailing_metadata'。我想知道在客户端访问尾随元数据的方法。

Answer 1

很抱歉 we don't yet have an example illustrating metadata but you can see here how getting the trailing metadata on the invocation side requires using with_call (or future, but that may change the control flow in a way that you don't want changed, so I think that with_call 应该是您的首选）。我认为您的调用端代码应该类似于

response, call = _stub.DoSomething.with_call(request) 
print(call.trailing_metadata())

.

如何从 python gRPC 客户端访问尾随元数据

How to access trailing metadata from python gRPC client

grpc