Add type annotations to various functions within distributed.worker (…

…#5290)

.gitignore

@@ -23,3 +23,4 @@ dask-worker-space/
 .ycm_extra_conf.py
 tags
 .ipynb_checkpoints
+.venv/

distributed/worker.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import asyncio
 import bisect
 import builtins
@@ -17,7 +19,10 @@
 from datetime import timedelta
 from inspect import isawaitable
 from pickle import PicklingError
-from typing import Dict, Hashable, Iterable, Optional
+from typing import TYPE_CHECKING, Dict, Hashable, Iterable, Optional
+
+if TYPE_CHECKING:
+    from .client import Client
 
 from tlz import first, keymap, merge, pluck  # noqa: F401
 from tornado.ioloop import IOLoop, PeriodicCallback
@@ -2818,8 +2823,14 @@ async def plugin_remove(self, comm=None, name=None):
             return {"status": "OK"}
 
     async def actor_execute(
-        self, comm=None, actor=None, function=None, args=(), kwargs={}
+        self,
+        comm=None,
+        actor=None,
+        function=None,
+        args=(),
+        kwargs: Optional[dict] = None,
     ):
+        kwargs = kwargs or {}
         separate_thread = kwargs.pop("separate_thread", True)
         key = actor
         actor = self.actors[key]
@@ -2854,7 +2865,7 @@ def actor_attribute(self, comm=None, actor=None, attribute=None):
         except Exception as ex:
             return {"status": "error", "exception": to_serialize(ex)}
 
-    def meets_resource_constraints(self, key):
+    def meets_resource_constraints(self, key: str) -> bool:
         ts = self.tasks[key]
         if not ts.resource_restrictions:
             return True
@@ -3264,8 +3275,7 @@ async def get_profile(
         return prof
 
     async def get_profile_metadata(self, comm=None, start=0, stop=None):
-        if stop is None:
-            add_recent = True
+        add_recent = stop is None
         now = time() + self.scheduler_delay
         stop = stop or now
         start = start or 0
@@ -3447,14 +3457,14 @@ def validate_state(self):
     #######################################
 
     @property
-    def client(self):
+    def client(self) -> Client:
         with self._lock:
             if self._client:
                 return self._client
             else:
                 return self._get_client()
 
-    def _get_client(self, timeout=None):
+    def _get_client(self, timeout=None) -> Client:
         """Get local client attached to this worker
 
         If no such client exists, create one
@@ -3536,7 +3546,7 @@ def get_current_task(self):
         return self.active_threads[threading.get_ident()]
 
 
-def get_worker():
+def get_worker() -> Worker:
     """Get the worker currently running this task
 
     Examples
@@ -3563,7 +3573,7 @@ def get_worker():
             raise ValueError("No workers found")
 
 
-def get_client(address=None, timeout=None, resolve_address=True):
+def get_client(address=None, timeout=None, resolve_address=True) -> Client:
     """Get a client while within a task.
 
     This client connects to the same scheduler to which the worker is connected
@@ -3678,7 +3688,7 @@ class Reschedule(Exception):
     """
 
 
-def parse_memory_limit(memory_limit, nthreads, total_cores=CPU_COUNT):
+def parse_memory_limit(memory_limit, nthreads, total_cores=CPU_COUNT) -> Optional[int]:
     if memory_limit is None:
         return None
 
@@ -3807,7 +3817,7 @@ def execute_task(task):
 _cache_lock = threading.Lock()
 
 
-def dumps_function(func):
+def dumps_function(func) -> bytes:
     """Dump a function to bytes, cache functions"""
     try:
         with _cache_lock:
@@ -4028,7 +4038,7 @@ def __repr__(self):
     return msg
 
 
-def convert_args_to_str(args, max_len=None):
+def convert_args_to_str(args, max_len: Optional[int] = None) -> str:
     """Convert args to a string, allowing for some arguments to raise
     exceptions during conversion and ignoring them.
     """
@@ -4047,7 +4057,7 @@ def convert_args_to_str(args, max_len=None):
         return "({})".format(", ".join(strs))
 
 
-def convert_kwargs_to_str(kwargs, max_len=None):
+def convert_kwargs_to_str(kwargs: dict, max_len: Optional[int] = None) -> str:
     """Convert kwargs to a string, allowing for some arguments to raise
     exceptions during conversion and ignoring them.
     """