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Start `.devx.cli` extensions for pop CLI frameworks

Starting of with just a `typer` (and thus transitively `click`)
`typer.Typer.callback` hook which allows passthrough of the `--ll
<loglevel: str>` and `--pdb <debug_mode: bool>` flags for use when
building CLIs that use the runtime Bo

Still needs lotsa refinement and obviously better docs but, the doc
string for `load_runtime_vars()` shows how to use the underlying
`.devx._debug.open_crash_handler()` via a wrapper that can be passed the
`--pdb` flag and then enable debug mode throughout the entire actor
system.
multihomed
Tyler Goodlet 2023-09-28 15:36:24 -04:00
parent fa9a9cfb1d
commit 7bed470f5c
2 changed files with 153 additions and 2 deletions

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@ -27,8 +27,10 @@ from functools import (
partial,
cached_property,
)
from contextlib import asynccontextmanager as acm
from contextlib import contextmanager as cm
from contextlib import (
asynccontextmanager as acm,
contextmanager as cm,
)
from typing import (
Any,
Callable,

149
tractor/devx/cli.py 100644
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@ -0,0 +1,149 @@
# tractor: structured concurrent "actors".
# Copyright 2018-eternity Tyler Goodlet.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program 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 Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
CLI framework extensions for hacking on the actor runtime.
Currently popular frameworks supported are:
- `typer` via the `@callback` API
"""
from __future__ import annotations
from contextlib import (
# asynccontextmanager as acm,
nullcontext,
contextmanager as cm,
)
from typing import (
Any,
Callable,
)
from typing_extensions import Annotated
import typer
from ._debug import open_crash_handler
_runtime_vars: dict[str, Any] = {}
def load_runtime_vars(
ctx: typer.Context,
callback: Callable,
pdb: bool = False, # --pdb
ll: Annotated[
str,
typer.Option(
'--loglevel',
'-l',
help='BigD logging level',
),
] = 'cancel', # -l info
):
'''
Maybe engage crash handling with `pdbp` when code inside
a `typer` CLI endpoint cmd raises.
To use this callback simply take your `app = typer.Typer()` instance
and decorate this function with it like so:
.. code:: python
from tractor.devx import cli
app = typer.Typer()
# manual decoration to hook into `click`'s context system!
cli.load_runtime_vars = app.callback(
invoke_without_command=True,
)
And then you can use the now augmented `click` CLI context as so,
.. code:: python
@app.command(
context_settings={
"allow_extra_args": True,
"ignore_unknown_options": True,
}
)
def my_cli_cmd(
ctx: typer.Context,
):
rtvars: dict = ctx.runtime_vars
pdb: bool = rtvars['pdb']
with tractor.devx.cli.maybe_open_crash_handler(pdb=pdb):
trio.run(
partial(
my_tractor_main_task_func,
debug_mode=pdb,
loglevel=rtvars['ll'],
)
)
which will enable log level and debug mode globally for the entire
`tractor` + `trio` runtime thereafter!
Bo
'''
global _runtime_vars
_runtime_vars |= {
'pdb': pdb,
'll': ll,
}
ctx.runtime_vars: dict[str, Any] = _runtime_vars
print(
f'`typer` sub-cmd: {ctx.invoked_subcommand}\n'
f'`tractor` runtime vars: {_runtime_vars}'
)
# XXX NOTE XXX: hackzone.. if no sub-cmd is specified (the
# default if the user just invokes `bigd`) then we simply
# invoke the sole `_bigd()` cmd passing in the "parent"
# typer.Context directly to that call since we're treating it
# as a "non sub-command" or wtv..
# TODO: ideally typer would have some kinda built-in way to get
# this behaviour without having to construct and manually
# invoke our own cmd..
if (
ctx.invoked_subcommand is None
or ctx.invoked_subcommand == callback.__name__
):
cmd: typer.core.TyperCommand = typer.core.TyperCommand(
name='bigd',
callback=callback,
)
ctx.params = {'ctx': ctx}
cmd.invoke(ctx)
@cm
def maybe_open_crash_handler(pdb: bool = False):
# if the --pdb flag is passed always engage
# the pdb REPL on any crashes B)
rtctx = nullcontext
if pdb:
rtctx = open_crash_handler
with rtctx():
yield