major refactoring of the control session/parser classes; restructured constants

docstrings and full test coverage for server module; small adjustments
massive overhaul of the control server interface;
2022-02-13 19:39:21 +01:00 · 2022-02-13 16:17:50 +01:00 · 2022-02-12 22:51:52 +01:00 · 2022-02-09 23:14:42 +01:00 · 2022-02-08 23:09:33 +01:00 · 2022-02-08 16:43:44 +01:00
20 changed files with 1840 additions and 190 deletions
--- a/674
+++ b/674
@@ -0,0 +1,674 @@
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  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <https://www.gnu.org/licenses/>.
  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/COPYING.LESSER
+++ b/COPYING.LESSER
@@ -0,0 +1,165 @@
                   GNU LESSER GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007
 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
  This version of the GNU Lesser General Public License incorporates
 the terms and conditions of version 3 of the GNU General Public
 License, supplemented by the additional permissions listed below.
  0. Additional Definitions.
  As used herein, "this License" refers to version 3 of the GNU Lesser
 General Public License, and the "GNU GPL" refers to version 3 of the GNU
 General Public License.
  "The Library" refers to a covered work governed by this License,
 other than an Application or a Combined Work as defined below.
  An "Application" is any work that makes use of an interface provided
 by the Library, but which is not otherwise based on the Library.
 Defining a subclass of a class defined by the Library is deemed a mode
 of using an interface provided by the Library.
  A "Combined Work" is a work produced by combining or linking an
 Application with the Library.  The particular version of the Library
 with which the Combined Work was made is also called the "Linked
 Version".
  The "Minimal Corresponding Source" for a Combined Work means the
 Corresponding Source for the Combined Work, excluding any source code
 for portions of the Combined Work that, considered in isolation, are
 based on the Application, and not on the Linked Version.
  The "Corresponding Application Code" for a Combined Work means the
 object code and/or source code for the Application, including any data
 and utility programs needed for reproducing the Combined Work from the
 Application, but excluding the System Libraries of the Combined Work.
  1. Exception to Section 3 of the GNU GPL.
  You may convey a covered work under sections 3 and 4 of this License
 without being bound by section 3 of the GNU GPL.
  2. Conveying Modified Versions.
  If you modify a copy of the Library, and, in your modifications, a
 facility refers to a function or data to be supplied by an Application
 that uses the facility (other than as an argument passed when the
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   a) under this License, provided that you make a good faith effort to
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   function or data, the facility still operates, and performs
   whatever part of its purpose remains meaningful, or
   b) under the GNU GPL, with none of the additional permissions of
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   for conveying Corresponding Source.)
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 Library side by side in a single library together with other library
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   on the Library, uncombined with any other library facilities,
   conveyed under the terms of this License.
   b) Give prominent notice with the combined library that part of it
   is a work based on the Library, and explaining where to find the
   accompanying uncombined form of the same work.
  6. Revised Versions of the GNU Lesser General Public License.
  The Free Software Foundation may publish revised and/or new versions
 of the GNU Lesser General Public License from time to time. Such new
 versions will be similar in spirit to the present version, but may
 differ in detail to address new problems or concerns.
  Each version is given a distinguishing version number. If the
 Library as you received it specifies that a certain numbered version
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 Library.
--- a/README.md
+++ b/README.md
@@ -1,19 +1,61 @@
 # asyncio-taskpool
-Dynamically manage pools of asyncio tasks
+**Dynamically manage pools of asyncio tasks**
 ## Summary
 A task pool is an object with a simple interface for aggregating and dynamically managing asynchronous tasks.
 With an interface that is intentionally similar to the [`multiprocessing.Pool`](https://docs.python.org/3/library/multiprocessing.html#module-multiprocessing.pool) class from the standard library, the `TaskPool` provides you such methods as `apply`, `map`, and `starmap` to execute coroutines concurrently as [`asyncio.Task`](https://docs.python.org/3/library/asyncio-task.html#task-object) objects. There is no limitation imposed on what kind of tasks can be run or in what combination, when new ones can be added, or when they can be cancelled.
 For a more streamlined use-case, the `SimpleTaskPool` provides an even more intuitive and simple interface at the cost of flexibility.
 If you need control over a task pool at runtime, you can launch an asynchronous `ControlServer` to be able to interface with the pool from an outside process or via a network, and stop/start tasks within the pool as you wish.
 ## Usage
-See [USAGE.md](usage/USAGE.md)
+Generally speaking, a task is added to a pool by providing it with a coroutine function reference as well as the arguments for that function. Here is what that could look like:
 ```python
 from asyncio_taskpool import SimpleTaskPool
 ...
 async def work(foo, bar): ...
 ...
 async def main():
    pool = SimpleTaskPool(work, args=('xyz', 420))
    await pool.start(5)
    ...
    pool.stop(3)
    ...
    pool.lock()
    await pool.gather()
    ...
 ```
 Since one of the main goals of `asyncio-taskpool` is to be able to start/stop tasks dynamically or "on-the-fly", _most_ of the associated methods are non-blocking _most_ of the time. A notable exception is the `gather` method for awaiting the return of all tasks in the pool. (It is essentially a glorified wrapper around the [`asyncio.gather`](https://docs.python.org/3/library/asyncio-task.html#asyncio.gather) function.)
 For working and fully documented demo scripts see [USAGE.md](usage/USAGE.md).
 ## Installation
-`pip install asyncio-taskpool`
+```shell
 pip install asyncio-taskpool
 ```
 ## Dependencies
 Python Version 3.8+, tested on Linux
-## Building from source
+## Testing
-Run `python -m build`
+Install `asyncio-taskpool[dev]` dependencies or just manually install `coverage` with `pip`. 
 Execute the [`./coverage.sh`](coverage.sh) shell script to run all unit tests and receive the coverage report.
 ## License
 `asyncio-taskpool` is licensed under the **GNU LGPL version 3.0** specifically.
 The full license texts for the [GNU GPLv3.0](COPYING) and the [GNU LGPLv3.0](COPYING.LESSER) are included in this repository. If not, see https://www.gnu.org/licenses/.
 ## Copyright
 © 2022 Daniil Fajnberg
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,17 +1,25 @@
 [metadata]
 name = asyncio-taskpool
-version = 0.1.7
+version = 0.3.2
 author = Daniil Fajnberg
 author_email = mail@daniil.fajnberg.de
 description = Dynamically manage pools of asyncio tasks
 long_description = file: README.md
 long_description_content_type = text/markdown
 keywords = asyncio, concurrency, tasks, coroutines, asynchronous, server
 url = https://git.fajnberg.de/daniil/asyncio-taskpool
 project_urls =
    Bug Tracker = https://git.fajnberg.de/daniil/asyncio-taskpool/issues
 classifiers =
    Development Status :: 3 - Alpha
    Programming Language :: Python :: 3
    Operating System :: OS Independent
    License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)
    Intended Audience :: Developers
    Intended Audience :: System Administrators
    Framework :: AsyncIO
    Topic :: Software Development :: Libraries
    Topic :: Software Development :: Libraries :: Python Modules
 [options]
 package_dir =
--- a/src/asyncio_taskpool/init.py
+++ b/src/asyncio_taskpool/init.py
@@ -1,2 +1,23 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Brings the main classes up to package level for import convenience.
 """
 from .pool import TaskPool, SimpleTaskPool
 from .server import UnixControlServer
--- a/src/asyncio_taskpool/main.py
+++ b/src/asyncio_taskpool/main.py
@@ -1,3 +1,24 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 CLI client entry point.
 """
 import sys
 from argparse import ArgumentParser
 from asyncio import run
--- a/src/asyncio_taskpool/client.py
+++ b/src/asyncio_taskpool/client.py
@@ -1,10 +1,33 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Classes of control clients for a simply interface to a task pool control server.
 """
 import json
 import shutil
 import sys
 from abc import ABC, abstractmethod
 from asyncio.streams import StreamReader, StreamWriter, open_unix_connection
 from pathlib import Path
-from asyncio_taskpool import constants
+from .constants import CLIENT_EXIT, CLIENT_INFO, SESSION_MSG_BYTES
-from asyncio_taskpool.types import ClientConnT
+from .types import ClientConnT
 class ControlClient(ABC):
@@ -13,19 +36,29 @@ class ControlClient(ABC):
    async def open_connection(self, **kwargs) -> ClientConnT:
        raise NotImplementedError
    @staticmethod
    def client_info() -> dict:
        return {CLIENT_INFO.TERMINAL_WIDTH: shutil.get_terminal_size().columns}
    def __init__(self, **conn_kwargs) -> None:
        self._conn_kwargs = conn_kwargs
        self._connected: bool = False
    async def _server_handshake(self, reader: StreamReader, writer: StreamWriter) -> None:
        self._connected = True
        writer.write(json.dumps(self.client_info()).encode())
        await writer.drain()
        print("Connected to", (await reader.read(SESSION_MSG_BYTES)).decode())
    async def _interact(self, reader: StreamReader, writer: StreamWriter) -> None:
        try:
            msg = input("> ").strip().lower()
        except EOFError:
-            msg = constants.CLIENT_EXIT
+            msg = CLIENT_EXIT
        except KeyboardInterrupt:
            print()
            return
-        if msg == constants.CLIENT_EXIT:
+        if msg == CLIENT_EXIT:
            writer.close()
            self._connected = False
            return
@@ -36,15 +69,14 @@ class ControlClient(ABC):
            self._connected = False
            print(e, file=sys.stderr)
            return
-        print((await reader.read(constants.MSG_BYTES)).decode())
+        print((await reader.read(SESSION_MSG_BYTES)).decode())
    async def start(self):
        reader, writer = await self.open_connection(**self._conn_kwargs)
        if reader is None:
            print("Failed to connect.", file=sys.stderr)
            return
-        self._connected = True
+        await self._server_handshake(reader, writer)
        print("Connected to", (await reader.read(constants.MSG_BYTES)).decode())
        while self._connected:
            await self._interact(reader, writer)
        print("Disconnected from control server.")
--- a/src/asyncio_taskpool/constants.py
+++ b/src/asyncio_taskpool/constants.py
@@ -1,8 +1,44 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Constants used by more than one module in the package.
 """
 PACKAGE_NAME = 'asyncio_taskpool'
-MSG_BYTES = 1024
+
 CMD_START = 'start'
 CMD_STOP = 'stop'
 CMD_STOP_ALL = 'stop_all'
 CMD_NUM_RUNNING = 'num_running'
 CMD_FUNC = 'func'
 CLIENT_EXIT = 'exit'
 SESSION_MSG_BYTES = 1024 * 100
 SESSION_PARSER_WRITER = 'session_writer'
 class CLIENT_INFO:
    __slots__ = ()
    TERMINAL_WIDTH = 'terminal_width'
 class CMD:
    __slots__ = ()
    CMD = 'command'
    NAME = 'name'
    POOL_SIZE = 'pool-size'
    NUM_RUNNING = 'num-running'
    START = 'start'
    STOP = 'stop'
    STOP_ALL = 'stop-all'
    FUNC_NAME = 'func-name'
--- a/src/asyncio_taskpool/exceptions.py
+++ b/src/asyncio_taskpool/exceptions.py
@@ -1,8 +1,29 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Custom exception classes used in various modules.
 """
 class PoolException(Exception):
    pass
-class PoolIsClosed(PoolException):
+class PoolIsLocked(PoolException):
    pass
@@ -22,9 +43,17 @@ class InvalidTaskID(PoolException):
    pass
-class PoolStillOpen(PoolException):
+class PoolStillUnlocked(PoolException):
    pass
 class NotCoroutine(PoolException):
    pass
 class ServerException(Exception):
    pass
 class HelpRequested(ServerException):
    pass
--- a/src/asyncio_taskpool/helpers.py
+++ b/src/asyncio_taskpool/helpers.py
@@ -1,6 +1,29 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Miscellaneous helper functions.
 """
 import re
 from asyncio.coroutines import iscoroutinefunction
 from asyncio.queues import Queue
-from typing import Any, Optional
+from inspect import getdoc
 from typing import Any, Optional, Union
 from .types import T, AnyCallableT, ArgsT, KwArgsT
@@ -27,3 +50,21 @@ def star_function(function: AnyCallableT, arg: Any, arg_stars: int = 0) -> T:
 async def join_queue(q: Queue) -> None:
    await q.join()
 def tasks_str(num: int) -> str:
    return "tasks" if num != 1 else "task"
 def get_first_doc_line(obj: object) -> str:
    return getdoc(obj).strip().split("\n", 1)[0]
 async def return_or_exception(_function_to_execute: AnyCallableT, *args, **kwargs) -> Union[T, Exception]:
    try:
        if iscoroutinefunction(_function_to_execute):
            return await _function_to_execute(*args, **kwargs)
        else:
            return _function_to_execute(*args, **kwargs)
    except Exception as e:
        return e
--- a/src/asyncio_taskpool/pool.py
+++ b/src/asyncio_taskpool/pool.py
@@ -1,3 +1,36 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 This module contains the definitions of the task pool classes.
 A task pool is an object with a simple interface for aggregating and dynamically managing asynchronous tasks.
 Generally speaking, a task is added to a pool by providing it with a coroutine function reference as well as the 
 arguments for that function.
 The `BaseTaskPool` class is a parent class and not intended for direct use.
 The `TaskPool` and `SimpleTaskPool` are subclasses intended for direct use.
 While the former allows for heterogeneous collections of tasks that can be entirely unrelated to one another, the 
 latter requires a preemptive decision about the function **and** its arguments upon initialization and only allows
 to dynamically control the **number** of tasks running at any point in time.
 For further details about the classes check their respective docstrings.
 """
 import logging
 from asyncio import gather
 from asyncio.coroutines import iscoroutine, iscoroutinefunction
@@ -31,7 +64,7 @@ class BaseTaskPool:
        """Initializes the necessary internal attributes and adds the new pool to the general pools list."""
        self._enough_room: Semaphore = Semaphore()
        self.pool_size = pool_size
-        self._open: bool = True
+        self._locked: bool = False
        self._counter: int = 0
        self._running: Dict[int, Task] = {}
        self._cancelled: Dict[int, Task] = {}
@@ -45,6 +78,7 @@ class BaseTaskPool:
        log.debug("%s initialized", str(self))
    def __str__(self) -> str:
        """Returns the name of the task pool."""
        return f'{self.__class__.__name__}-{self._name or self._idx}'
    @property
@@ -71,9 +105,21 @@ class BaseTaskPool:
        self._pool_size = value
    @property
-    def is_open(self) -> bool:
+    def is_locked(self) -> bool:
-        """Returns `True` if more the pool has not been closed yet."""
+        """Returns `True` if more the pool has been locked (see below)."""
-        return self._open
+        return self._locked
    def lock(self) -> None:
        """Disallows any more tasks to be started in the pool."""
        if not self._locked:
            self._locked = True
            log.info("%s is locked!", str(self))
    def unlock(self) -> None:
        """Allows new tasks to be started in the pool."""
        if self._locked:
            self._locked = False
            log.info("%s was unlocked.", str(self))
    @property
    def num_running(self) -> int:
@@ -187,7 +233,7 @@ class BaseTaskPool:
        finally:
            await self._task_ending(task_id, custom_callback=end_callback)
-    async def _start_task(self, awaitable: Awaitable, ignore_closed: bool = False, end_callback: EndCallbackT = None,
+    async def _start_task(self, awaitable: Awaitable, ignore_lock: bool = False, end_callback: EndCallbackT = None,
                          cancel_callback: CancelCallbackT = None) -> int:
        """
        Starts a coroutine as a new task in the pool.
@@ -197,8 +243,8 @@ class BaseTaskPool:
        Args:
            awaitable:
                The actual coroutine to be run within the task pool.
-            ignore_closed (optional):
+            ignore_lock (optional):
-                If `True`, even if the pool is closed, the task will still be started.
+                If `True`, even if the pool is locked, the task will still be started.
            end_callback (optional):
                A callback to execute after the task has ended.
                It is run with the task's ID as its only positional argument.
@@ -208,12 +254,12 @@ class BaseTaskPool:
        Raises:
            `asyncio_taskpool.exceptions.NotCoroutine` if `awaitable` is not a coroutine.
-            `asyncio_taskpool.exceptions.PoolIsClosed` if the pool has been closed and `ignore_closed` is `False`.
+            `asyncio_taskpool.exceptions.PoolIsLocked` if the pool has been locked and `ignore_lock` is `False`.
        """
        if not iscoroutine(awaitable):
            raise exceptions.NotCoroutine(f"Not awaitable: {awaitable}")
-        if not (self.is_open or ignore_closed):
+        if self._locked and not ignore_lock:
-            raise exceptions.PoolIsClosed("Cannot start new tasks")
+            raise exceptions.PoolIsLocked("Cannot start new tasks")
        await self._enough_room.acquire()
        task_id = self._counter
        self._counter += 1
@@ -303,16 +349,11 @@ class BaseTaskPool:
            self._interrupt_flag.clear()
        return results
    def close(self) -> None:
        """Disallows any more tasks to be started in the pool."""
        self._open = False
        log.info("%s is closed!", str(self))
    async def gather(self, return_exceptions: bool = False):
        """
        Calls `asyncio.gather` on **all** tasks from the pool, returns their results, and forgets the tasks.
-        The `close()` method must have been called prior to this.
+        The `lock()` method must have been called prior to this.
        Note that there may be an unknown number of coroutine functions "queued" to be run as tasks.
        This can happen, if for example the `TaskPool.map` method was called with `num_tasks` set to a number smaller
@@ -327,10 +368,10 @@ class BaseTaskPool:
            return_exceptions (optional): Passed directly into `gather`.
        Raises:
-            `asyncio_taskpool.exceptions.PoolStillOpen` if the pool has not been closed yet.
+            `asyncio_taskpool.exceptions.PoolStillUnlocked` if the pool has not been locked yet.
        """
-        if self._open:
+        if not self._locked:
-            raise exceptions.PoolStillOpen("Pool must be closed, before tasks can be gathered")
+            raise exceptions.PoolStillUnlocked("Pool must be locked, before tasks can be gathered")
        await gather(*self._before_gathering)
        results = await gather(*self._ended.values(), *self._cancelled.values(), *self._running.values(),
                               return_exceptions=return_exceptions)
@@ -415,7 +456,7 @@ class TaskPool(BaseTaskPool):
        Raises:
            `NotCoroutine` if `func` is not a coroutine function.
-            `PoolIsClosed` if the pool has been closed already.
+            `PoolIsLocked` if the pool has been locked already.
        """
        ids = await gather(*(self._apply_one(func, args, kwargs, end_callback, cancel_callback) for _ in range(num)))
        # TODO: for some reason PyCharm wrongly claims that `gather` returns a tuple of exceptions
@@ -468,7 +509,7 @@ class TaskPool(BaseTaskPool):
        try:
            await self._start_task(
                star_function(func, arg, arg_stars=arg_stars),
-                ignore_closed=True,
+                ignore_lock=True,
                end_callback=partial(TaskPool._queue_callback, self, q=q, first_batch_started=first_batch_started,
                                     func=func, arg_stars=arg_stars, end_callback=end_callback,
                                     cancel_callback=cancel_callback),
@@ -579,10 +620,10 @@ class TaskPool(BaseTaskPool):
                It is run with the task's ID as its only positional argument.
        Raises:
-            `asyncio_taskpool.exceptions.PoolIsClosed` if the pool has been closed.
+            `asyncio_taskpool.exceptions.PoolIsLocked` if the pool has been locked.
        """
-        if not self.is_open:
+        if not self._locked:
-            raise exceptions.PoolIsClosed("Cannot start new tasks")
+            raise exceptions.PoolIsLocked("Cannot start new tasks")
        args_queue = self._set_up_args_queue(args_iter, num_tasks)
        # We need a flag to ensure that starting all tasks from the first batch here will not be blocked by the
        # `_queue_callback` triggered by one or more of them.
@@ -628,7 +669,7 @@ class TaskPool(BaseTaskPool):
                It is run with the task's ID as its only positional argument.
        Raises:
-            `PoolIsClosed` if the pool has been closed.
+            `PoolIsLocked` if the pool has been locked.
            `NotCoroutine` if `func` is not a coroutine function.
        """
        await self._map(func, arg_iter, arg_stars=0, num_tasks=num_tasks,
--- a/src/asyncio_taskpool/server.py
+++ b/src/asyncio_taskpool/server.py
@@ -1,3 +1,24 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 This module contains the task pool control server class definitions.
 """
 import logging
 from abc import ABC, abstractmethod
 from asyncio import AbstractServer
@@ -5,126 +26,126 @@ from asyncio.exceptions import CancelledError
 from asyncio.streams import StreamReader, StreamWriter, start_unix_server
 from asyncio.tasks import Task, create_task
 from pathlib import Path
-from typing import Tuple, Union, Optional
+from typing import Optional, Union
 from . import constants
 from .pool import SimpleTaskPool
 from .client import ControlClient, UnixControlClient
 from .pool import TaskPool, SimpleTaskPool
 from .session import ControlSession
 from .types import ConnectedCallbackT
 log = logging.getLogger(__name__)
 def tasks_str(num: int) -> str:
    return "tasks" if num != 1 else "task"
 def get_cmd_arg(msg: str) -> Union[Tuple[str, Optional[int]], Tuple[None, None]]:
    cmd = msg.strip().split(' ', 1)
    if len(cmd) > 1:
        try:
            return cmd[0], int(cmd[1])
        except ValueError:
            return None, None
    return cmd[0], None
 class ControlServer(ABC):  # TODO: Implement interface for normal TaskPool instances, not just SimpleTaskPool
-    client_class = ControlClient
+    """
    Abstract base class for a task pool control server.
    This class acts as a wrapper around an async server instance and initializes a `ControlSession` upon a client
    connecting to it. The entire interface is defined within that session class.
    """
    _client_class = ControlClient
    @classmethod
    @property
    def client_class_name(cls) -> str:
        """Returns the name of the control client class matching the server class."""
        return cls._client_class.__name__
    @abstractmethod
-    async def get_server_instance(self, client_connected_cb, **kwargs) -> AbstractServer:
+    async def _get_server_instance(self, client_connected_cb: ConnectedCallbackT, **kwargs) -> AbstractServer:
        """
        Initializes, starts, and returns an async server instance (Unix or TCP type).
        Args:
            client_connected_cb:
                The callback for when a client connects to the server (as per `asyncio.start_server` or
                `asyncio.start_unix_server`); will always be the internal `_client_connected_cb` method.
            **kwargs (optional):
                Keyword arguments to pass into the function that starts the server.
        Returns:
            The running server object (a type of `asyncio.Server`).
        """
        raise NotImplementedError
    @abstractmethod
-    def final_callback(self) -> None:
+    def _final_callback(self) -> None:
        """The method to run after the server's `serve_forever` methods ends for whatever reason."""
        raise NotImplementedError
-    def __init__(self, pool: SimpleTaskPool, **server_kwargs) -> None:
+    def __init__(self, pool: Union[TaskPool, SimpleTaskPool], **server_kwargs) -> None:
-        self._pool: SimpleTaskPool = pool
+        """
        Initializes by merely saving the internal attributes, but without starting the server yet.
        The task pool must be passed here and can not be set/changed afterwards. This means a control server is always
        tied to one specific task pool.
        Args:
            pool:
                An instance of a `BaseTaskPool` subclass to tie the server to.
            **server_kwargs (optional):
                Keyword arguments that will be passed into the function that starts the server.
        """
        self._pool: Union[TaskPool, SimpleTaskPool] = pool
        self._server_kwargs = server_kwargs
        self._server: Optional[AbstractServer] = None
-    async def _start_tasks(self, writer: StreamWriter, num: int = None) -> None:
+    @property
-        if num is None:
+    def pool(self) -> Union[TaskPool, SimpleTaskPool]:
-            num = 1
+        """Read-only property for accessing the task pool instance controlled by the server."""
-        log.debug("%s requests starting %s %s", self.client_class.__name__, num, tasks_str(num))
+        return self._pool
        writer.write(str(await self._pool.start(num)).encode())
-    def _stop_tasks(self, writer: StreamWriter, num: int = None) -> None:
+    def is_serving(self) -> bool:
-        if num is None:
+        """Wrapper around the `asyncio.Server.is_serving` method."""
-            num = 1
+        return self._server.is_serving()
        log.debug("%s requests stopping %s %s", self.client_class.__name__, num, tasks_str(num))
        # the requested number may be greater than the total number of running tasks
        writer.write(str(self._pool.stop(num)).encode())
    def _stop_all_tasks(self, writer: StreamWriter) -> None:
        log.debug("%s requests stopping all tasks", self.client_class.__name__)
        writer.write(str(self._pool.stop_all()).encode())
    def _pool_size(self, writer: StreamWriter) -> None:
        log.debug("%s requests number of running tasks", self.client_class.__name__)
        writer.write(str(self._pool.num_running).encode())
    def _pool_func(self, writer: StreamWriter) -> None:
        log.debug("%s requests pool function", self.client_class.__name__)
        writer.write(self._pool.func_name.encode())
    async def _listen(self, reader: StreamReader, writer: StreamWriter) -> None:
        while self._server.is_serving():
            msg = (await reader.read(constants.MSG_BYTES)).decode().strip()
            if not msg:
                log.debug("%s disconnected", self.client_class.__name__)
                break
            cmd, arg = get_cmd_arg(msg)
            if cmd == constants.CMD_START:
                await self._start_tasks(writer, arg)
            elif cmd == constants.CMD_STOP:
                self._stop_tasks(writer, arg)
            elif cmd == constants.CMD_STOP_ALL:
                self._stop_all_tasks(writer)
            elif cmd == constants.CMD_NUM_RUNNING:
                self._pool_size(writer)
            elif cmd == constants.CMD_FUNC:
                self._pool_func(writer)
            else:
                log.debug("%s sent invalid command: %s", self.client_class.__name__, msg)
                writer.write(b"Invalid command!")
            await writer.drain()
    async def _client_connected_cb(self, reader: StreamReader, writer: StreamWriter) -> None:
-        log.debug("%s connected", self.client_class.__name__)
+        """
-        writer.write(str(self._pool).encode())
+        The universal client callback that will be passed into the `_get_server_instance` method.
-        await writer.drain()
+        Instantiates a control session, performs the client handshake, and enters the session's `listen` loop.
-        await self._listen(reader, writer)
+        """
        session = ControlSession(self, reader, writer)
        await session.client_handshake()
        await session.listen()
    async def _serve_forever(self) -> None:
        """
        To be run as an `asyncio.Task` by the following method.
        Serves as a wrapper around the the `asyncio.Server.serve_forever` method that ensures that the `_final_callback`
        method is called, when the former method ends for whatever reason.
        """
        try:
            async with self._server:
                await self._server.serve_forever()
        except CancelledError:
            log.debug("%s stopped", self.__class__.__name__)
        finally:
-            self.final_callback()
+            self._final_callback()
    async def serve_forever(self) -> Task:
        """
        This method actually starts the server and begins listening to client connections on the specified interface.
        It should never block because the serving will be performed in a separate task.
        """
        log.debug("Starting %s...", self.__class__.__name__)
-        self._server = await self.get_server_instance(self._client_connected_cb, **self._server_kwargs)
+        self._server = await self._get_server_instance(self._client_connected_cb, **self._server_kwargs)
        return create_task(self._serve_forever())
 class UnixControlServer(ControlServer):
-    client_class = UnixControlClient
+    """Task pool control server class that exposes a unix socket for control clients to connect to."""
    _client_class = UnixControlClient
    def __init__(self, pool: SimpleTaskPool, **server_kwargs) -> None:
        self._socket_path = Path(server_kwargs.pop('path'))
        super().__init__(pool, **server_kwargs)
-    async def get_server_instance(self, client_connected_cb, **kwargs) -> AbstractServer:
+    async def _get_server_instance(self, client_connected_cb: ConnectedCallbackT, **kwargs) -> AbstractServer:
-        srv = await start_unix_server(client_connected_cb, self._socket_path, **kwargs)
+        server = await start_unix_server(client_connected_cb, self._socket_path, **kwargs)
        log.debug("Opened socket '%s'", str(self._socket_path))
-        return srv
+        return server
-    def final_callback(self) -> None:
+    def _final_callback(self) -> None:
        """Removes the unix socket on which the server was listening."""
        self._socket_path.unlink()
        log.debug("Removed socket '%s'", str(self._socket_path))
--- a/src/asyncio_taskpool/session.py
+++ b/src/asyncio_taskpool/session.py
@@ -0,0 +1,157 @@
 import logging
 import json
 from argparse import ArgumentError, HelpFormatter, Namespace
 from asyncio.streams import StreamReader, StreamWriter
 from typing import Callable, Optional, Union, TYPE_CHECKING
 from .constants import CMD, SESSION_PARSER_WRITER, SESSION_MSG_BYTES, CLIENT_INFO
 from .exceptions import HelpRequested
 from .helpers import get_first_doc_line, return_or_exception, tasks_str
 from .pool import TaskPool, SimpleTaskPool
 from .session_parser import CommandParser, NUM
 if TYPE_CHECKING:
    from .server import ControlServer
 log = logging.getLogger(__name__)
 class ControlSession:
    def __init__(self, server: 'ControlServer', reader: StreamReader, writer: StreamWriter) -> None:
        self._control_server: 'ControlServer' = server
        self._pool: Union[TaskPool, SimpleTaskPool] = server.pool
        self._client_class_name = server.client_class_name
        self._reader: StreamReader = reader
        self._writer: StreamWriter = writer
        self._parser: Optional[CommandParser] = None
        self._subparsers = None
    def _add_parser_command(self, name: str, prog: str = None, short_help: str = None, long_help: str = None, 
                            **kwargs) -> CommandParser:
        if prog is None:
            prog = name
        kwargs.setdefault('help', short_help or long_help)
        kwargs.setdefault('description', long_help or short_help)
        return self._subparsers.add_parser(name, prog=prog, parent=self._parser, **kwargs)
    def _add_base_commands(self) -> None:
        self._subparsers = self._parser.add_subparsers(title="Commands", dest=CMD.CMD)
        self._add_parser_command(CMD.NAME, short_help=get_first_doc_line(self._pool.__class__.__str__))
        self._add_parser_command(
            CMD.POOL_SIZE, 
            short_help="Get/set the maximum number of tasks in the pool.", 
            formatter_class=HelpFormatter
        ).add_optional_num_argument(
            default=None,
            help=f"If passed a number: {get_first_doc_line(self._pool.__class__.pool_size.fset)} "
                 f"If omitted: {get_first_doc_line(self._pool.__class__.pool_size.fget)}"
        )
        self._add_parser_command(
            CMD.NUM_RUNNING, short_help=get_first_doc_line(self._pool.__class__.num_running.fget)
        )
    def _add_simple_commands(self) -> None:
        self._add_parser_command(
            CMD.START, short_help=get_first_doc_line(self._pool.__class__.start)
        ).add_optional_num_argument(
            help="Number of tasks to start."
        )
        self._add_parser_command(
            CMD.STOP, short_help=get_first_doc_line(self._pool.__class__.stop)
        ).add_optional_num_argument(
            help="Number of tasks to stop."
        )
        self._add_parser_command(CMD.STOP_ALL, short_help=get_first_doc_line(self._pool.__class__.stop_all))
        self._add_parser_command(
            CMD.FUNC_NAME, short_help=get_first_doc_line(self._pool.__class__.func_name.fget)
        )
    def _init_parser(self, client_terminal_width: int) -> None:
        parser_kwargs = {
            'prog': '',
            SESSION_PARSER_WRITER: self._writer,
            CLIENT_INFO.TERMINAL_WIDTH: client_terminal_width,
        }
        self._parser = CommandParser(**parser_kwargs)
        self._add_base_commands()
        if isinstance(self._pool, TaskPool):
            pass  # TODO
        elif isinstance(self._pool, SimpleTaskPool):
            self._add_simple_commands()
    async def client_handshake(self) -> None:
        client_info = json.loads((await self._reader.read(SESSION_MSG_BYTES)).decode().strip())
        log.debug("%s connected", self._client_class_name)
        self._init_parser(client_info[CLIENT_INFO.TERMINAL_WIDTH])
        self._writer.write(str(self._pool).encode())
        await self._writer.drain()
    async def _write_function_output(self, func: Callable, *args, **kwargs) -> None:
        output = await return_or_exception(func, *args, **kwargs)
        self._writer.write(b"ok" if output is None else str(output).encode())
    async def _cmd_name(self, **_kwargs) -> None:
        log.debug("%s requests task pool name", self._client_class_name)
        await self._write_function_output(self._pool.__class__.__str__, self._pool)
    async def _cmd_pool_size(self, **kwargs) -> None:
        num = kwargs.get(NUM)
        if num is None:
            log.debug("%s requests pool size", self._client_class_name)
            await self._write_function_output(self._pool.__class__.pool_size.fget, self._pool)
        else:
            log.debug("%s requests setting pool size to %s", self._client_class_name, num)
            await self._write_function_output(self._pool.__class__.pool_size.fset, self._pool, num)
    async def _cmd_num_running(self, **_kwargs) -> None:
        log.debug("%s requests number of running tasks", self._client_class_name)
        await self._write_function_output(self._pool.__class__.num_running.fget, self._pool)
    async def _cmd_start(self, **kwargs) -> None:
        num = kwargs[NUM]
        log.debug("%s requests starting %s %s", self._client_class_name, num, tasks_str(num))
        await self._write_function_output(self._pool.start, num)
    async def _cmd_stop(self, **kwargs) -> None:
        num = kwargs[NUM]
        log.debug("%s requests stopping %s %s", self._client_class_name, num, tasks_str(num))
        await self._write_function_output(self._pool.stop, num)
    async def _cmd_stop_all(self, **_kwargs) -> None:
        log.debug("%s requests stopping all tasks", self._client_class_name)
        await self._write_function_output(self._pool.stop_all)
    async def _cmd_func_name(self, **_kwargs) -> None:
        log.debug("%s requests pool function name", self._client_class_name)
        await self._write_function_output(self._pool.__class__.func_name.fget, self._pool)
    async def _execute_command(self, args: Namespace) -> None:
        args = vars(args)
        cmd: str = args.pop(CMD.CMD, None)
        if cmd is not None:
            method = getattr(self, f'_cmd_{cmd.replace("-", "_")}')
            await method(**args)
    async def _parse_command(self, msg: str) -> None:
        try:
            args, argv = self._parser.parse_known_args(msg.split(' '))
        except ArgumentError as e:
            self._writer.write(str(e).encode())
            return
        except HelpRequested:
            return
        if argv:
            log.debug("%s sent unknown arguments: %s", self._client_class_name, msg)
            self._writer.write(b"Invalid command!")
            return
        await self._execute_command(args)
    async def listen(self) -> None:
        while self._control_server.is_serving():
            msg = (await self._reader.read(SESSION_MSG_BYTES)).decode().strip()
            if not msg:
                log.debug("%s disconnected", self._client_class_name)
                break
            await self._parse_command(msg)
            await self._writer.drain()
--- a/src/asyncio_taskpool/session_parser.py
+++ b/src/asyncio_taskpool/session_parser.py
@@ -0,0 +1,60 @@
 from argparse import Action, ArgumentParser, ArgumentDefaultsHelpFormatter, HelpFormatter
 from asyncio.streams import StreamWriter
 from typing import Type, TypeVar
 from .constants import SESSION_PARSER_WRITER, CLIENT_INFO
 from .exceptions import HelpRequested
 FmtCls = TypeVar('FmtCls', bound=Type[HelpFormatter])
 FORMATTER_CLASS = 'formatter_class'
 NUM = 'num'
 class CommandParser(ArgumentParser):
    @staticmethod
    def help_formatter_factory(terminal_width: int, base_cls: FmtCls = None) -> FmtCls:
        if base_cls is None:
            base_cls = ArgumentDefaultsHelpFormatter
        class ClientHelpFormatter(base_cls):
            def __init__(self, *args, **kwargs) -> None:
                kwargs['width'] = terminal_width
                super().__init__(*args, **kwargs)
        return ClientHelpFormatter
    def __init__(self, *args, **kwargs) -> None:
        parent: CommandParser = kwargs.pop('parent', None)
        self._stream_writer: StreamWriter = parent.stream_writer if parent else kwargs.pop(SESSION_PARSER_WRITER)
        self._terminal_width: int = parent.terminal_width if parent else kwargs.pop(CLIENT_INFO.TERMINAL_WIDTH)
        kwargs[FORMATTER_CLASS] = self.help_formatter_factory(self._terminal_width, kwargs.get(FORMATTER_CLASS))
        kwargs.setdefault('exit_on_error', False)
        super().__init__(*args, **kwargs)
    @property
    def stream_writer(self) -> StreamWriter:
        return self._stream_writer
    @property
    def terminal_width(self) -> int:
        return self._terminal_width
    def _print_message(self, message: str, *args, **kwargs) -> None:
        if message:
            self.stream_writer.write(message.encode())
    def exit(self, status: int = 0, message: str = None) -> None:
        if message:
            self._print_message(message)
    def print_help(self, file=None) -> None:
        super().print_help(file)
        raise HelpRequested
    def add_optional_num_argument(self, *name_or_flags: str, **kwargs) -> Action:
        if not name_or_flags:
            name_or_flags = (NUM, )
        kwargs.setdefault('nargs', '?')
        kwargs.setdefault('default', 1)
        kwargs.setdefault('type', int)
        return self.add_argument(*name_or_flags, **kwargs)
--- a/src/asyncio_taskpool/types.py
+++ b/src/asyncio_taskpool/types.py
@@ -1,3 +1,24 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Custom type definitions used in various modules.
 """
 from asyncio.streams import StreamReader, StreamWriter
 from typing import Any, Awaitable, Callable, Iterable, Mapping, Tuple, TypeVar, Union
@@ -7,10 +28,11 @@ T = TypeVar('T')
 ArgsT = Iterable[Any]
 KwArgsT = Mapping[str, Any]
-AnyCallableT = Callable[[...], Union[Awaitable[T], T]]
+AnyCallableT = Callable[[...], Union[T, Awaitable[T]]]
 CoroutineFunc = Callable[[...], Awaitable[Any]]
 EndCallbackT = Callable
 CancelCallbackT = Callable
 ConnectedCallbackT = Callable[[StreamReader, StreamWriter], Awaitable[None]]
 ClientConnT = Union[Tuple[StreamReader, StreamWriter], Tuple[None, None]]
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -0,0 +1,96 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Unittests for the `asyncio_taskpool.helpers` module.
 """
 from unittest import IsolatedAsyncioTestCase
 from unittest.mock import MagicMock, AsyncMock, NonCallableMagicMock
 from asyncio_taskpool import helpers
 class HelpersTestCase(IsolatedAsyncioTestCase):
    async def test_execute_optional(self):
        f, args, kwargs = NonCallableMagicMock(), [1, 2], None
        a = [f, args, kwargs]  # to avoid IDE nagging
        self.assertIsNone(await helpers.execute_optional(*a))
        expected_output = 'foo'
        f = MagicMock(return_value=expected_output)
        output = await helpers.execute_optional(f, args, kwargs)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(*args)
        f.reset_mock()
        kwargs = {'a': 100, 'b': 200}
        output = await helpers.execute_optional(f, args, kwargs)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(*args, **kwargs)
        f = AsyncMock(return_value=expected_output)
        output = await helpers.execute_optional(f, args, kwargs)
        self.assertEqual(expected_output, output)
        f.assert_awaited_once_with(*args, **kwargs)
    def test_star_function(self):
        expected_output = 'bar'
        f = MagicMock(return_value=expected_output)
        a = (1, 2, 3)
        stars = 0
        output = helpers.star_function(f, a, stars)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(a)
        f.reset_mock()
        stars = 1
        output = helpers.star_function(f, a, stars)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(*a)
        f.reset_mock()
        a = {'a': 1, 'b': 2}
        stars = 2
        output = helpers.star_function(f, a, stars)
        self.assertEqual(expected_output, output)
        f.assert_called_once_with(**a)
        with self.assertRaises(ValueError):
            helpers.star_function(f, a, 3)
        with self.assertRaises(ValueError):
            helpers.star_function(f, a, -1)
        with self.assertRaises(ValueError):
            helpers.star_function(f, a, 123456789)
    async def test_join_queue(self):
        mock_join = AsyncMock()
        mock_queue = MagicMock(join=mock_join)
        self.assertIsNone(await helpers.join_queue(mock_queue))
        mock_join.assert_awaited_once_with()
    def test_task_str(self):
        self.assertEqual("task", helpers.tasks_str(1))
        self.assertEqual("tasks", helpers.tasks_str(0))
        self.assertEqual("tasks", helpers.tasks_str(-1))
        self.assertEqual("tasks", helpers.tasks_str(2))
        self.assertEqual("tasks", helpers.tasks_str(-10))
        self.assertEqual("tasks", helpers.tasks_str(42))
--- a/tests/test_pool.py
+++ b/tests/test_pool.py
@@ -1,3 +1,24 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Unittests for the `asyncio_taskpool.pool` module.
 """
 import asyncio
 from asyncio.exceptions import CancelledError
 from asyncio.queues import Queue
@@ -68,7 +89,7 @@ class BaseTaskPoolTestCase(CommonTestCase):
    def test_init(self):
        self.assertIsInstance(self.task_pool._enough_room, asyncio.locks.Semaphore)
-        self.assertTrue(self.task_pool._open)
+        self.assertFalse(self.task_pool._locked)
        self.assertEqual(0, self.task_pool._counter)
        self.assertDictEqual(EMPTY_DICT, self.task_pool._running)
        self.assertDictEqual(EMPTY_DICT, self.task_pool._cancelled)
@@ -103,9 +124,23 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.task_pool.pool_size = new_size = 69
        self.assertEqual(new_size, self.task_pool._pool_size)
-    def test_is_open(self):
+    def test_is_locked(self):
-        self.task_pool._open = FOO
+        self.task_pool._locked = FOO
-        self.assertEqual(FOO, self.task_pool.is_open)
+        self.assertEqual(FOO, self.task_pool.is_locked)
    def test_lock(self):
        assert not self.task_pool._locked
        self.task_pool.lock()
        self.assertTrue(self.task_pool._locked)
        self.task_pool.lock()
        self.assertTrue(self.task_pool._locked)
    def test_unlock(self):
        self.task_pool._locked = True
        self.task_pool.unlock()
        self.assertFalse(self.task_pool._locked)
        self.task_pool.unlock()
        self.assertFalse(self.task_pool._locked)
    def test_num_running(self):
        self.task_pool._running = ['foo', 'bar', 'baz']
@@ -211,11 +246,9 @@ class BaseTaskPoolTestCase(CommonTestCase):
    @patch.object(pool, 'create_task')
    @patch.object(pool.BaseTaskPool, '_task_wrapper', new_callable=MagicMock)
    @patch.object(pool.BaseTaskPool, '_task_name', return_value=FOO)
-    @patch.object(pool.BaseTaskPool, 'is_open', new_callable=PropertyMock)
+    async def test__start_task(self, mock__task_name: MagicMock, mock__task_wrapper: AsyncMock,
-    async def test__start_task(self, mock_is_open: MagicMock, mock__task_name: MagicMock,
+                               mock_create_task: MagicMock):
                               mock__task_wrapper: AsyncMock, mock_create_task: MagicMock):
        def reset_mocks() -> None:
            mock_is_open.reset_mock()
            mock__task_name.reset_mock()
            mock__task_wrapper.reset_mock()
            mock_create_task.reset_mock()
@@ -226,31 +259,27 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.task_pool._counter = count = 123
        self.task_pool._enough_room._value = room = 123
-        with self.assertRaises(exceptions.NotCoroutine):
+        def check_nothing_changed() -> None:
            await self.task_pool._start_task(MagicMock(), end_callback=mock_end_cb, cancel_callback=mock_cancel_cb)
            self.assertEqual(count, self.task_pool._counter)
            self.assertNotIn(count, self.task_pool._running)
            self.assertEqual(room, self.task_pool._enough_room._value)
        mock_is_open.assert_not_called()
            mock__task_name.assert_not_called()
            mock__task_wrapper.assert_not_called()
            mock_create_task.assert_not_called()
            reset_mocks()
-        mock_is_open.return_value = ignore_closed = False
+        with self.assertRaises(exceptions.NotCoroutine):
            await self.task_pool._start_task(MagicMock(), end_callback=mock_end_cb, cancel_callback=mock_cancel_cb)
        check_nothing_changed()
        self.task_pool._locked = True
        ignore_closed = False
        mock_awaitable = mock_coroutine()
-        with self.assertRaises(exceptions.PoolIsClosed):
+        with self.assertRaises(exceptions.PoolIsLocked):
            await self.task_pool._start_task(mock_awaitable, ignore_closed,
                                             end_callback=mock_end_cb, cancel_callback=mock_cancel_cb)
        await mock_awaitable
-        self.assertEqual(count, self.task_pool._counter)
+        check_nothing_changed()
        self.assertNotIn(count, self.task_pool._running)
        self.assertEqual(room, self.task_pool._enough_room._value)
        mock_is_open.assert_called_once_with()
        mock__task_name.assert_not_called()
        mock__task_wrapper.assert_not_called()
        mock_create_task.assert_not_called()
        reset_mocks()
        ignore_closed = True
        mock_awaitable = mock_coroutine()
@@ -261,7 +290,6 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.assertEqual(count + 1, self.task_pool._counter)
        self.assertEqual(mock_task, self.task_pool._running[count])
        self.assertEqual(room - 1, self.task_pool._enough_room._value)
        mock_is_open.assert_called_once_with()
        mock__task_name.assert_called_once_with(count)
        mock__task_wrapper.assert_called_once_with(mock_awaitable, count, mock_end_cb, mock_cancel_cb)
        mock_create_task.assert_called_once_with(mock_wrapped, name=FOO)
@@ -280,7 +308,6 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.assertEqual(count + 1, self.task_pool._counter)
        self.assertNotIn(count, self.task_pool._running)
        self.assertEqual(room, self.task_pool._enough_room._value)
        mock_is_open.assert_called_once_with()
        mock__task_name.assert_called_once_with(count)
        mock__task_wrapper.assert_called_once_with(mock_awaitable, count, mock_end_cb, mock_cancel_cb)
        mock_create_task.assert_called_once_with(mock_wrapped, name=FOO)
@@ -345,11 +372,6 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.assertDictEqual(self.task_pool._ended, EMPTY_DICT)
        self.assertDictEqual(self.task_pool._cancelled, EMPTY_DICT)
    def test_close(self):
        assert self.task_pool._open
        self.task_pool.close()
        self.assertFalse(self.task_pool._open)
    async def test_gather(self):
        test_exception = TestException()
        mock_ended_func, mock_cancelled_func = AsyncMock(return_value=FOO), AsyncMock(side_effect=test_exception)
@@ -361,8 +383,8 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.task_pool._running = running = {789: mock_running_func()}
        self.task_pool._interrupt_flag.set()
-        assert self.task_pool._open
+        assert not self.task_pool._locked
-        with self.assertRaises(exceptions.PoolStillOpen):
+        with self.assertRaises(exceptions.PoolStillUnlocked):
            await self.task_pool.gather()
        self.assertDictEqual(self.task_pool._ended, ended)
        self.assertDictEqual(self.task_pool._cancelled, cancelled)
@@ -370,7 +392,7 @@ class BaseTaskPoolTestCase(CommonTestCase):
        self.assertListEqual(self.task_pool._before_gathering, before_gather)
        self.assertTrue(self.task_pool._interrupt_flag.is_set())
-        self.task_pool._open = False
+        self.task_pool._locked = True
        def check_assertions(output) -> None:
            self.assertListEqual([FOO, test_exception, BAR], output)
@@ -449,7 +471,7 @@ class TaskPoolTestCase(CommonTestCase):
        mock_flag, end_cb, cancel_cb = MagicMock(), MagicMock(), MagicMock()
        self.assertIsNone(await self.task_pool._queue_consumer(q, mock_flag, mock_func, stars, end_cb, cancel_cb))
        self.assertTrue(q.empty())
-        mock__start_task.assert_awaited_once_with(awaitable, ignore_closed=True,
+        mock__start_task.assert_awaited_once_with(awaitable, ignore_lock=True,
                                                  end_callback=queue_callback, cancel_callback=cancel_cb)
        mock_star_function.assert_called_once_with(mock_func, arg, arg_stars=stars)
        mock_partial.assert_called_once_with(pool.TaskPool._queue_callback, self.task_pool,
@@ -459,7 +481,7 @@ class TaskPoolTestCase(CommonTestCase):
        mock_star_function.reset_mock()
        mock_partial.reset_mock()
-        self.assertIsNone(await self.task_pool._queue_consumer(q, mock_func, stars, end_cb, cancel_cb))
+        self.assertIsNone(await self.task_pool._queue_consumer(q, mock_flag, mock_func, stars, end_cb, cancel_cb))
        self.assertTrue(q.empty())
        mock__start_task.assert_not_awaited()
        mock_star_function.assert_not_called()
@@ -528,9 +550,8 @@ class TaskPoolTestCase(CommonTestCase):
    @patch.object(pool, 'Event')
    @patch.object(pool.TaskPool, '_queue_consumer')
    @patch.object(pool.TaskPool, '_set_up_args_queue')
-    @patch.object(pool.TaskPool, 'is_open', new_callable=PropertyMock)
+    async def test__map(self, mock__set_up_args_queue: MagicMock, mock__queue_consumer: AsyncMock,
-    async def test__map(self, mock_is_open: MagicMock, mock__set_up_args_queue: MagicMock,
+                        mock_event_cls: MagicMock):
                        mock__queue_consumer: AsyncMock, mock_event_cls: MagicMock):
        qsize = 4
        mock__set_up_args_queue.return_value = mock_q = MagicMock(qsize=MagicMock(return_value=qsize))
        mock_flag_set = MagicMock()
@@ -540,17 +561,14 @@ class TaskPoolTestCase(CommonTestCase):
        args_iter, num_tasks = (FOO, BAR, 1, 2, 3), 2
        end_cb, cancel_cb = MagicMock(), MagicMock()
-        mock_is_open.return_value = False
+        self.task_pool._locked = False
-        with self.assertRaises(exceptions.PoolIsClosed):
+        with self.assertRaises(exceptions.PoolIsLocked):
            await self.task_pool._map(mock_func, args_iter, stars, num_tasks, end_cb, cancel_cb)
        mock_is_open.assert_called_once_with()
        mock__set_up_args_queue.assert_not_called()
        mock__queue_consumer.assert_not_awaited()
        mock_flag_set.assert_not_called()
-        mock_is_open.reset_mock()
+        self.task_pool._locked = True
        mock_is_open.return_value = True
        self.assertIsNone(await self.task_pool._map(mock_func, args_iter, stars, num_tasks, end_cb, cancel_cb))
        mock__set_up_args_queue.assert_called_once_with(args_iter, num_tasks)
        mock__queue_consumer.assert_has_awaits(qsize * [call(mock_q, mock_flag, mock_func, arg_stars=stars,
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -0,0 +1,143 @@
 import asyncio
 import logging
 from pathlib import Path
 from unittest import IsolatedAsyncioTestCase
 from unittest.mock import AsyncMock, MagicMock, patch
 from asyncio_taskpool import server
 from asyncio_taskpool.client import ControlClient, UnixControlClient
 FOO, BAR = 'foo', 'bar'
 class ControlServerTestCase(IsolatedAsyncioTestCase):
    log_lvl: int
    @classmethod
    def setUpClass(cls) -> None:
        cls.log_lvl = server.log.level
        server.log.setLevel(999)
    @classmethod
    def tearDownClass(cls) -> None:
        server.log.setLevel(cls.log_lvl)
    def setUp(self) -> None:
        self.abstract_patcher = patch('asyncio_taskpool.server.ControlServer.__abstractmethods__', set())
        self.mock_abstract_methods = self.abstract_patcher.start()
        self.mock_pool = MagicMock()
        self.kwargs = {FOO: 123, BAR: 456}
        self.server = server.ControlServer(pool=self.mock_pool, **self.kwargs)
    def tearDown(self) -> None:
        self.abstract_patcher.stop()
    def test_client_class_name(self):
        self.assertEqual(ControlClient.__name__, server.ControlServer.client_class_name)
    async def test_abstract(self):
        with self.assertRaises(NotImplementedError):
            args = [AsyncMock()]
            await self.server._get_server_instance(*args)
        with self.assertRaises(NotImplementedError):
            self.server._final_callback()
    def test_init(self):
        self.assertEqual(self.mock_pool, self.server._pool)
        self.assertEqual(self.kwargs, self.server._server_kwargs)
        self.assertIsNone(self.server._server)
    def test_pool(self):
        self.assertEqual(self.mock_pool, self.server.pool)
    def test_is_serving(self):
        self.server._server = MagicMock(is_serving=MagicMock(return_value=FOO + BAR))
        self.assertEqual(FOO + BAR, self.server.is_serving())
    @patch.object(server, 'ControlSession')
    async def test__client_connected_cb(self, mock_client_session_cls: MagicMock):
        mock_client_handshake, mock_listen = AsyncMock(), AsyncMock()
        mock_client_session_cls.return_value = MagicMock(client_handshake=mock_client_handshake, listen=mock_listen)
        mock_reader, mock_writer = MagicMock(), MagicMock()
        self.assertIsNone(await self.server._client_connected_cb(mock_reader, mock_writer))
        mock_client_session_cls.assert_called_once_with(self.server, mock_reader, mock_writer)
        mock_client_handshake.assert_awaited_once_with()
        mock_listen.assert_awaited_once_with()
    @patch.object(server.ControlServer, '_final_callback')
    async def test__serve_forever(self, mock__final_callback: MagicMock):
        mock_aenter, mock_serve_forever = AsyncMock(), AsyncMock(side_effect=asyncio.CancelledError)
        self.server._server = MagicMock(__aenter__=mock_aenter, serve_forever=mock_serve_forever)
        with self.assertLogs(server.log, logging.DEBUG):
            self.assertIsNone(await self.server._serve_forever())
        mock_aenter.assert_awaited_once_with()
        mock_serve_forever.assert_awaited_once_with()
        mock__final_callback.assert_called_once_with()
        mock_aenter.reset_mock()
        mock_serve_forever.reset_mock(side_effect=True)
        mock__final_callback.reset_mock()
        self.assertIsNone(await self.server._serve_forever())
        mock_aenter.assert_awaited_once_with()
        mock_serve_forever.assert_awaited_once_with()
        mock__final_callback.assert_called_once_with()
    @patch.object(server, 'create_task')
    @patch.object(server.ControlServer, '_serve_forever', new_callable=MagicMock())
    @patch.object(server.ControlServer, '_get_server_instance')
    async def test_serve_forever(self, mock__get_server_instance: AsyncMock, mock__serve_forever: MagicMock,
                                 mock_create_task: MagicMock):
        mock__serve_forever.return_value = mock_awaitable = 'some_coroutine'
        mock_create_task.return_value = expected_output = 12345
        output = await self.server.serve_forever()
        self.assertEqual(expected_output, output)
        mock__get_server_instance.assert_awaited_once_with(self.server._client_connected_cb, **self.kwargs)
        mock__serve_forever.assert_called_once_with()
        mock_create_task.assert_called_once_with(mock_awaitable)
 class UnixControlServerTestCase(IsolatedAsyncioTestCase):
    log_lvl: int
    @classmethod
    def setUpClass(cls) -> None:
        cls.log_lvl = server.log.level
        server.log.setLevel(999)
    @classmethod
    def tearDownClass(cls) -> None:
        server.log.setLevel(cls.log_lvl)
    def setUp(self) -> None:
        self.base_init_patcher = patch.object(server.ControlServer, '__init__')
        self.mock_base_init = self.base_init_patcher.start()
        self.mock_pool = MagicMock()
        self.path = '/tmp/asyncio_taskpool'
        self.kwargs = {FOO: 123, BAR: 456}
        self.server = server.UnixControlServer(pool=self.mock_pool, path=self.path, **self.kwargs)
    def tearDown(self) -> None:
        self.base_init_patcher.stop()
    def test__client_class(self):
        self.assertEqual(UnixControlClient, self.server._client_class)
    def test_init(self):
        self.assertEqual(Path(self.path), self.server._socket_path)
        self.mock_base_init.assert_called_once_with(self.mock_pool, **self.kwargs)
    @patch.object(server, 'start_unix_server')
    async def test__get_server_instance(self, mock_start_unix_server: AsyncMock):
        mock_start_unix_server.return_value = expected_output = 'totally_a_server'
        mock_callback, mock_kwargs = MagicMock(), {'a': 1, 'b': 2}
        args = [mock_callback]
        output = await self.server._get_server_instance(*args, **mock_kwargs)
        self.assertEqual(expected_output, output)
        mock_start_unix_server.assert_called_once_with(mock_callback, Path(self.path), **mock_kwargs)
    def test__final_callback(self):
        self.server._socket_path = MagicMock()
        self.assertIsNone(self.server._final_callback())
        self.server._socket_path.unlink.assert_called_once_with()
--- a/usage/USAGE.md
+++ b/usage/USAGE.md
@@ -7,12 +7,12 @@ The minimum required setup is a "worker" coroutine function that can do somethin
 The following demo code enables full log output first for additional clarity. It is complete and should work as is.
 ### Code
 ```python
 import logging
 import asyncio
-from asyncio_taskpool.pool import SimpleTaskPool
+from asyncio_taskpool import SimpleTaskPool
 logging.getLogger().setLevel(logging.NOTSET)
 logging.getLogger('asyncio_taskpool').addHandler(logging.StreamHandler())
@@ -23,8 +23,8 @@ async def work(n: int) -> None:
    Pseudo-worker function. 
    Counts up to an integer with a second of sleep before each iteration.
    In a real-world use case, a worker function should probably have access 
-    to some synchronisation primitive or shared resource to distribute work 
+    to some synchronisation primitive (such as a queue) or shared resource
-    between an arbitrary number of workers.
+    to distribute work between an arbitrary number of workers.
    """
    for i in range(n):
        await asyncio.sleep(1)
@@ -38,7 +38,7 @@ async def main() -> None:
    await pool.start()  # launches work task 3
    await asyncio.sleep(1.5)  # lets the tasks work for a bit
    pool.stop(2)  # cancels tasks 3 and 2
-    pool.close()  # required for the last line
+    pool.lock()  # required for the last line
    await pool.gather()  # awaits all tasks, then flushes the pool
@@ -60,7 +60,7 @@ did 1
 did 1
 did 1
 did 0
-SimpleTaskPool-0 is closed!
+SimpleTaskPool-0 is locked!
 Cancelling SimpleTaskPool-0_Task-3 ...
 Cancelled SimpleTaskPool-0_Task-3
 Ended SimpleTaskPool-0_Task-3
@@ -86,12 +86,12 @@ As with the simple example, we need "worker" coroutine functions that can do som
 The following demo code enables full log output first for additional clarity. It is complete and should work as is.
 ### Code
 ```python
 import logging
 import asyncio
-from asyncio_taskpool.pool import TaskPool
+from asyncio_taskpool import TaskPool
 logging.getLogger().setLevel(logging.NOTSET)
 logging.getLogger('asyncio_taskpool').addHandler(logging.StreamHandler())
@@ -126,15 +126,14 @@ async def main() -> None:
    # The second one will start (with ID 3), only once there is room in the pool,
    # which -- in this example -- will be the case after ID 2 ends;
    # until then the `starmap` method call **will block**!
-    # Once there is room in the pool again, the third one will start immediately (and receive ID 4).
+    # Once there is room in the pool again, the third and fourth will each start (with IDs 4 and 5)
-    # The last one will start (with ID 5) **only** once there is room in the pool **and** no more than one of these 
+    # **only** once there is room in the pool **and** no more than one of these last four tasks is running.
    # last four tasks is running.
    args_list = [(0, 10), (10, 20), (20, 30), (30, 40)]
    print("Calling `starmap`...")
    await pool.starmap(other_work, args_list, num_tasks=2)
    print("`starmap` returned")
-    # Now we close the pool, so that we can safely await all our tasks.
+    # Now we lock the pool, so that we can safely await all our tasks.
-    pool.close()
+    pool.lock()
    # Finally, we block, until all tasks have ended.
    print("Called `gather`")
    await pool.gather()
@@ -178,11 +177,11 @@ work with 150
 work with 150
 other_work with 8
 Ended TaskPool-0_Task-2    <--- here Task-2 makes room in the pool and unblocks `main()`
-TaskPool-0 is closed!
+TaskPool-0 is locked!
 Started TaskPool-0_Task-3
 other_work with 9
 `starmap` returned
-Called `gather`
+Called `gather`    <--- now this will block `main()` until all tasks have ended
 work with 160
 work with 160
 other_work with 10
@@ -230,3 +229,5 @@ other_work with 39
 Done.
 Ended TaskPool-0_Task-5
 ```
 © 2022 Daniil Fajnberg
--- a/usage/example_server.py
+++ b/usage/example_server.py
@@ -1,3 +1,25 @@
 __author__ = "Daniil Fajnberg"
 __copyright__ = "Copyright © 2022 Daniil Fajnberg"
 __license__ = """GNU LGPLv3.0
 This file is part of asyncio-taskpool.
 asyncio-taskpool is free software: you can redistribute it and/or modify it under the terms of
 version 3.0 of the GNU Lesser General Public License as published by the Free Software Foundation.
 asyncio-taskpool is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with asyncio-taskpool. 
 If not, see <https://www.gnu.org/licenses/>."""
 __doc__ = """
 Working example of a UnixControlServer in combination with the SimpleTaskPool.
 Use the main CLI client to interface at the socket.
 """
 import asyncio
 import logging
@@ -48,12 +70,12 @@ async def main() -> None:
    control_server_task = await UnixControlServer(pool, path='/tmp/py_asyncio_taskpool.sock').serve_forever()
    # We block until `.task_done()` has been called once by our workers for every item placed into the queue.
    await q.join()
-    # Since we don't need any "work" done anymore, we can close our control server by cancelling the task.
+    # Since we don't need any "work" done anymore, we can lock our control server by cancelling the task.
    control_server_task.cancel()
    # Since our workers should now be stuck waiting for more items to pick from the queue, but no items are left,
    # we can now safely cancel their tasks.
    pool.stop_all()
-    pool.close()
+    pool.lock()
    # Finally we allow for all tasks to do do their cleanup, if they need to do any, upon being cancelled.
    # We block until they all return or raise an exception, but since we are not interested in any of their exceptions,
    # we just silently collect their exceptions along with their return values.
Author	SHA1	Message	Date
Daniil Fajnberg	538b9cc91c	major refactoring of the control session/parser classes; restructured constants	2022-02-13 19:39:21 +01:00
Daniil Fajnberg	3fb451a00e	docstrings and full test coverage for `server` module; small adjustments	2022-02-13 16:17:50 +01:00
Daniil Fajnberg	be03097bf4	massive overhaul of the control server interface; making use of `ArgumentParser` for client commands; new `ControlSession` object instantiated upon connection	2022-02-12 22:51:52 +01:00
Daniil Fajnberg	024e5db0d4	license & copyright notices; docstrings for each module; extended readme	2022-02-09 23:14:42 +01:00
Daniil Fajnberg	bc9d2f243e	renamed "closing" a pool to "locking" it	2022-02-08 23:09:33 +01:00
Daniil Fajnberg	012c8ac639	testing notes in readme	2022-02-08 16:43:44 +01:00
Daniil Fajnberg	8fd40839ee	full unittest coverage for the `helpers` module	2022-02-08 16:40:13 +01:00
Daniil Fajnberg	36d026f433	more precise comments	2022-02-08 16:24:37 +01:00