我有一个apolloserver graphql应用程序，并使用redispubsub订阅。有没有办法让我获得一个特定的订阅，并找出所有连接的客户端以及它们使用的参数？例如，有没有一种方法让我说“给我所有actioncomplete订阅，然后从中给我每个连接的客户机的actionid”？
另外，有没有一种方法可以连接到subscriptionserver的“onoperation”和“onoperationcomplete”生命周期事件？我使用 server.installSubscriptionHandlers(httpServer) 以下是我的订阅定义：

export const actionComplete = subscriptionField('actionComplete', {
  type: ActionCompleteResponse,
  description:
    'A subscription that notifies when the action is complete.',
  args: {
    actionId: stringArg({
      description: 'The id that corresponds to the action',
      nullable: false
    })
  },
  subscribe: withFilter(
    (_root, _args, { pubSub }) => pubSub.asyncIterator(['ACTION_COMPLETE']),
    (payload, args) => {
      return payload.id === args.actionId
    }
  ),
  resolve: payload => {
    return payload
  }
})

我创建的服务器类似于：

const server = new ApolloServer({... (ommitting the details here) ... })
const app = express()
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }))
server.applyMiddleware({ app })
const httpServer = createServer(app)
server.installSubscriptionHandlers(httpServer)
httpServer.listen({ port }, () =>
  console.log(`Server ready at http://localhost:${port}/graphql`)
)