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Expand asyncio-dangling-task (RUF006) to include new_event_loop #9976

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merged 2 commits into from
Feb 13, 2024
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Expand asyncio-dangling-task (RUF006) to include new_event_loop #9976

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10b5a83
Improve RUF006 detection
tyilo Feb 13, 2024
19ec2be
Resolve TODO
charliermarsh Feb 13, 2024
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23 changes: 23 additions & 0 deletions crates/ruff_linter/resources/test/fixtures/ruff/RUF006.py
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Original file line number Diff line number Diff line change
Expand Up @@ -162,3 +162,26 @@ async def f(x: bool):
T = asyncio.create_task(asyncio.sleep(1))
else:
T = None


# Error
def f():
loop = asyncio.new_event_loop()
loop.create_task(main()) # Error

# Error
def f():
loop = asyncio.get_event_loop()
loop.create_task(main()) # Error

# OK
def f():
global task
loop = asyncio.new_event_loop()
task = loop.create_task(main()) # Error

# OK
def f():
global task
loop = asyncio.get_event_loop()
task = loop.create_task(main()) # Error
21 changes: 16 additions & 5 deletions crates/ruff_linter/src/rules/ruff/rules/asyncio_dangling_task.rs
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Expand Up @@ -52,14 +52,15 @@ use ruff_text_size::Ranged;
/// - [The Python Standard Library](https://docs.python.org/3/library/asyncio-task.html#asyncio.create_task)
#[violation]
pub struct AsyncioDanglingTask {
expr: &'static str,
method: Method,
}

impl Violation for AsyncioDanglingTask {
#[derive_message_formats]
fn message(&self) -> String {
let AsyncioDanglingTask { method } = self;
format!("Store a reference to the return value of `asyncio.{method}`")
let AsyncioDanglingTask { expr, method } = self;
format!("Store a reference to the return value of `{expr}.{method}`")
}
}

Expand All @@ -80,19 +81,29 @@ pub(crate) fn asyncio_dangling_task(expr: &Expr, semantic: &SemanticModel) -> Op
})
{
return Some(Diagnostic::new(
AsyncioDanglingTask { method },
AsyncioDanglingTask {
expr: "asyncio",
method,
},
expr.range(),
));
}

// Ex) `loop = asyncio.get_running_loop(); loop.create_task(...)`
// Ex) `loop = ...; loop.create_task(...)`
if let Expr::Attribute(ast::ExprAttribute { attr, value, .. }) = func.as_ref() {
if attr == "create_task" {
if typing::resolve_assignment(value, semantic).is_some_and(|call_path| {
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I don't know if ruff's typing analysis is good enough for this, but it would be better to check that the type of value is asyncio.AbstractEventLoop, so that the following would also be flagged:

import asyncio


def create_event_loop() -> asyncio.AbstractEventLoop:
  return asyncio.new_event_loop()


loop = create_event_loop()
loop.create_task(asyncio.sleep(1))

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Yeah we don't quite support that yet unfortunately.

matches!(call_path.as_slice(), ["asyncio", "get_running_loop"])
matches!(
call_path.as_slice(),
[
"asyncio",
"get_event_loop" | "get_running_loop" | "new_event_loop"
]
)
}) {
return Some(Diagnostic::new(
AsyncioDanglingTask {
expr: "loop", // TODO: How can you turn `value` into a string?
method: Method::CreateTask,
},
expr.range(),
Expand Down
24 changes: 22 additions & 2 deletions ...ff_linter/src/rules/ruff/snapshots/ruff_linter__rules__ruff__tests__RUF006_RUF006.py.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -25,20 +25,40 @@ RUF006.py:68:12: RUF006 Store a reference to the return value of `asyncio.create
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ RUF006
|

RUF006.py:74:26: RUF006 Store a reference to the return value of `asyncio.create_task`
RUF006.py:74:26: RUF006 Store a reference to the return value of `loop.create_task`
|
72 | def f():
73 | loop = asyncio.get_running_loop()
74 | task: asyncio.Task = loop.create_task(coordinator.ws_connect())
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ RUF006
|

RUF006.py:97:5: RUF006 Store a reference to the return value of `asyncio.create_task`
RUF006.py:97:5: RUF006 Store a reference to the return value of `loop.create_task`
|
95 | def f():
96 | loop = asyncio.get_running_loop()
97 | loop.create_task(coordinator.ws_connect()) # Error
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ RUF006
|

RUF006.py:170:5: RUF006 Store a reference to the return value of `loop.create_task`
|
168 | def f():
169 | loop = asyncio.new_event_loop()
170 | loop.create_task(main()) # Error
| ^^^^^^^^^^^^^^^^^^^^^^^^ RUF006
171 |
172 | # Error
|

RUF006.py:175:5: RUF006 Store a reference to the return value of `loop.create_task`
|
173 | def f():
174 | loop = asyncio.get_event_loop()
175 | loop.create_task(main()) # Error
| ^^^^^^^^^^^^^^^^^^^^^^^^ RUF006
176 |
177 | # OK
|


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