Changed CLI logic. (#46)

Signed-off-by: Pavel Kirilin <win10@list.ru>

Author: s3rius

docs/examples/extending/cli.py

@@ -0,0 +1,19 @@
+from argparse import ArgumentParser
+from typing import Sequence
+
+from taskiq.abc.cmd import TaskiqCMD
+
+
+class MyCommand(TaskiqCMD):
+    short_help = "Demo command"
+
+    def exec(self, args: Sequence[str]) -> None:
+        parser = ArgumentParser()
+        parser.add_argument(
+            "--test",
+            dest="test",
+            default="default",
+            help="My test parameter.",
+        )
+        parsed = parser.parse_args(args)
+        print(parsed)

docs/extending-taskiq/cli.md

@@ -0,0 +1,69 @@
+---
+order: 4
+---
+
+# CLI
+
+You can easily add new subcommands to taskiq. All default subcommands also use this mechanism,
+since it's easy to use.
+
+At first you need to add a class that implements `taskiq.abc.cmd.TaskiqCMD` abstract class.
+
+@[code python](../examples/extending/cli.py)
+
+In the `exec` method, you should parse incoming arguments. But since all CLI arguments to taskiq are shifted you can ignore the `args` parameter.
+
+Also, you can use your favorite tool to build CLI, like [click](https://click.palletsprojects.com/) or [typer](https://typer.tiangolo.com/).
+
+After you have such class, you need to add entrypoint that points to that class.
+
+::: tabs
+
+@tab setuptools setup.py
+
+```python
+from setuptools import setup
+
+setup(
+    # ...,
+    entry_points={
+        'taskiq-cli': [
+            'demo = my_project.cmd:MyCommand',
+        ]
+    }
+)
+```
+
+@tab setuptools pyproject.toml
+
+```toml
+[project.entry-points.taskiq-cli]
+demo = "my_project.cmd:MyCommand"
+```
+
+@tab poetry
+
+```toml
+[tool.poetry.plugins.taskiq-cli]
+demo = "my_project.cmd:MyCommand"
+```
+
+:::
+
+You can read more about entry points in [python documentation](https://packaging.python.org/en/latest/specifications/entry-points/).
+The subcommand name is the same as the name of the entry point you've created.
+
+
+```bash
+$ taskiq demo --help
+usage: demo [-h] [--test TEST]
+
+optional arguments:
+  -h, --help   show this help message and exit
+  --test TEST  My test parameter.
+```
+
+```bash
+$ taskiq demo --test aaa
+Namespace(test='aaa')
+```

docs/guide/architecture-overview.md

@@ -99,7 +99,7 @@ You have to provide a path to your broker. As an example, if you want to start l
 with a broker that is stored in a variable `my broker` in the module `my_project.broker` run this in your terminal:
 
 ```
-taskiq my_project.broker:mybroker
+taskiq worker my_project.broker:mybroker
 ```
 
 taskiq can discover task modules to import automatically,

docs/guide/cli.md

@@ -4,16 +4,22 @@ order: 4
 
 # CLI
 
-Core library comes with CLI programm called `taskiq`, which is used to run workers.
+Core library comes with CLI programm called `taskiq`, which is used to run different subcommands.
 
-To run it you have to specify the broker you want to use and modules with defined tasks.
+
+By default taskiq is shipped with only one command: `worker`. You can search for more taskiq plugins
+using pypi. Some plugins may add new commands to taskiq.
+
+## Worker
+
+To run worker process, you have to specify the broker you want to use and modules with defined tasks.
 Like this:
 
 ```bash
-taskiq mybroker:broker_var my_project.module1 my_project.module2
+taskiq worker mybroker:broker_var my_project.module1 my_project.module2
 ```
 
-## Autoimporting
+### Autoimporting
 
 Enumerating all modules with tasks is not an option sometimes.
 That's why taskiq can autodiscover tasks in current directory recursively.
@@ -24,7 +30,7 @@ We have two options for this:
 * `--fs-discover` or `-fsd`. This option enables search of task files in current directory recursively, using the given pattern.
 
 
-## Type casts
+### Type casts
 
 One of features taskiq have is automatic type casts. For examle you have a type-hinted task like this:
 ```python
@@ -38,7 +44,7 @@ dataclasses as the input parameters.
 
 To disable this pass the `--no-parse` option to the taskiq.
 
-## Hot reload
+### Hot reload
 
 This is annoying to restart workers every time you modify tasks. That's why taskiq supports hot-reload.
 To enable this option simply pass the `--reload` or `-r` option to taskiq CLI.

docs/guide/getting-started.md

@@ -142,7 +142,7 @@ docker run --rm -d ^
 Now we need to start worker process by running taskiq cli command. You can get more info about the CLI in the [CLI](./cli.md) section.
 
 ```bash:no-line-numbers
-taskiq broker:broker
+taskiq worker broker:broker
 ```
 
 After the worker is up, we can run our script as an ordinary python file and see how the worker executes tasks.
@@ -206,7 +206,7 @@ docker run --rm -d ^
 Let's run taskiq once again. The command is the same.
 
 ```bash:no-line-numbers
-taskiq broker:broker
+taskiq worker broker:broker
 ```
 
 Now, if we run this file with python, we can get the correct results with a valid execution time.

poetry.lock

@@ -29,9 +29,11 @@ python = "^3.7"
 typing-extensions = ">=3.10.0.0"
 pydantic = "^1.6.2"
 pyzmq = { version = "^23.2.0", optional = true }
-uvloop = { version = "^0.16.0", optional = true }
+uvloop = { version = ">=0.16.0,<1", optional = true }
 watchdog = "^2.1.9"
-gitignore-parser = "^0.0.8"
+gitignore-parser = "^0.1.0"
+importlib-metadata = "<4.3"
+
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.1.2"
@@ -47,7 +49,7 @@ coverage = "^6.4.2"
 pytest-cov = "^3.0.0"
 mock = "^4.0.3"
 anyio = "^3.6.1"
-pytest-xdist = {version = "^2.5.0", extras = ["psutil"]}
+pytest-xdist = { version = "^2.5.0", extras = ["psutil"] }
 types-mock = "^4.0.15"
 
 [tool.poetry.extras]
@@ -57,6 +59,9 @@ uv = ["uvloop"]
 [tool.poetry.scripts]
 taskiq = "taskiq.__main__:main"
 
+[tool.poetry.plugins.taskiq-cli]
+worker = "taskiq.cli.worker.cmd:WorkerCMD"
+
 [tool.mypy]
 strict = true
 ignore_missing_imports = true

pyproject.toml

@@ -1,11 +1,75 @@
-from taskiq.cli.args import TaskiqArgs
-from taskiq.cli.worker import run_worker
+import argparse
+import sys
+from typing import Dict
 
+from importlib_metadata import entry_points, version
 
-def main() -> None:
-    """Main entrypoint for CLI."""
-    args = TaskiqArgs.from_cli()
-    run_worker(args)
+from taskiq.abc.cmd import TaskiqCMD
+
+
+def main() -> None:  # noqa: C901, WPS210
+    """
+    Main entrypoint of the taskiq.
+
+    This function collects all python entrypoints
+    and assembles a final argument parser.
+
+    All found entrypoints are used as subcommands.
+    All arguments are passed to them as it was a normal
+    call.
+    """
+    plugins = entry_points().select(group="taskiq-cli")
+    found_plugins = len(plugins)
+    parser = argparse.ArgumentParser(
+        description=f"""
+        CLI for taskiq. Distributed task queue.
+
+        This is a meta CLI. It searches for installed plugins
+        using python entrypoints
+        and passes all arguments to them.
+
+        We found {found_plugins} installed plugins.
+        """,
+    )
+    parser.add_argument(
+        "-V",
+        "--version",
+        dest="version",
+        action="store_true",
+        help="print current taskiq version and exit",
+    )
+    subcommands: Dict[str, TaskiqCMD] = {}
+    subparsers = parser.add_subparsers(
+        title="Available subcommands",
+        metavar="",
+        dest="subcommand",
+    )
+    for entrypoint in entry_points().select(group="taskiq-cli"):
+        try:
+            cmd_class = entrypoint.load()
+        except ImportError:
+            continue
+        if issubclass(cmd_class, TaskiqCMD):
+            subparsers.add_parser(
+                entrypoint.name,
+                help=cmd_class.short_help,
+                add_help=False,
+            )
+            subcommands[entrypoint.name] = cmd_class()
+
+    args, _ = parser.parse_known_args()
+
+    if args.version:
+        print(version("taskiq"))  # noqa: WPS421
+        return
+
+    if args.subcommand is None:
+        parser.print_help()
+        return
+
+    command = subcommands[args.subcommand]
+    sys.argv.pop(0)
+    command.exec(sys.argv[1:])
 
 
 if __name__ == "__main__":

taskiq/__main__.py

@@ -0,0 +1,16 @@
+from abc import ABC, abstractmethod
+from typing import Sequence
+
+
+class TaskiqCMD(ABC):
+    """Base class for new commands."""
+
+    short_help = ""
+
+    @abstractmethod
+    def exec(self, args: Sequence[str]) -> None:
+        """
+        Execute the command.
+
+        :param args: CLI args.
+        """

taskiq/abc/cmd.py

@@ -4,8 +4,8 @@
 
 from taskiq.abc.broker import AsyncBroker
 from taskiq.abc.result_backend import AsyncResultBackend, TaskiqResult
-from taskiq.cli.args import TaskiqArgs
-from taskiq.cli.receiver import Receiver
+from taskiq.cli.worker.args import WorkerArgs
+from taskiq.cli.worker.receiver import Receiver
 from taskiq.exceptions import TaskiqError
 from taskiq.message import BrokerMessage
 
@@ -102,12 +102,12 @@ def __init__(  # noqa: WPS211
         )
         self.receiver = Receiver(
             self,
-            TaskiqArgs(
+            WorkerArgs(
                 broker="",
                 modules=[],
                 max_threadpool_threads=sync_tasks_pool_size,
                 no_parse=not cast_types,
-                log_collector_format=logs_format or TaskiqArgs.log_collector_format,
+                log_collector_format=logs_format or WorkerArgs.log_collector_format,
             ),
         )