docstr: List all the workers.
docstr_tok: ["List","all","the","workers","."]
code: def list(
      self, context: AuthedServiceContext
  ) -> Union[SyftSuccess, SyftError]:
      """List all the workers."""
      result = self.stash.get_all(context.credentials)
  
      if result.is_err():
          return SyftError(
              message=f"Failed to fetch workers. {result.err()}"
          )
  
      workers = result.ok()
  
      if context.node.in_memory_workers:
          return workers
  
      # If container workers, check their statuses
      with contextlib.closing(docker.from_env()) as client:
          for idx, worker in enumerate(workers):
              worker_ = _check_and_update_status_for_worker(
                  client=client,
                  worker=worker,
                  worker_stash=self.stash,
                  credentials=context.credentials,
              )
  
              if not isinstance(worker_, SyftWorker):
                  return worker_
  
              workers[idx] = worker_
  
      return workers
  
imports: import contextlib
  from typing import List
  from typing import Tuple
  from typing import Union
  import docker
  from ...node.credentials import SyftVerifyKey
  from ...serde.serializable import serializable
  from ...store.document_store import DocumentStore
  from ...store.document_store import SyftSuccess
  from ...types.uid import UID
  from ...util.telemetry import instrument
  from ..service import AbstractService
  from ..service import AuthedServiceContext
  from ..service import SyftError
  from ..service import service_method
  from ..user.user_roles import ADMIN_ROLE_LEVEL
  from ..user.user_roles import DATA_SCIENTIST_ROLE_LEVEL
  from .utils import DEFAULT_WORKER_POOL_NAME
  from .utils import _get_healthcheck_based_on_status
  from .worker_pool import ContainerSpawnStatus
  from .worker_pool import SyftWorker
  from .worker_pool import WorkerHealth
  from .worker_pool import WorkerStatus
  from .worker_pool import _get_worker_container_status
  from .worker_stash import WorkerStash
label_desc: Use image node_id 3 for calling the WorkerService obj's underlying member method code with example usage: obj.list(context) and returns: workers, SyftError, workers, worker_