8000 Handle negative time.sleep values by ever0de · Pull Request #5906 · RustPython/RustPython · GitHub
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Handle negative time.sleep values #5906

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Merged
merged 4 commits into from
Jul 7, 2025
Merged

Handle negative time.sleep values #5906

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0e6e6b9
fix(time): Handle negative sleep values
ever0de Jul 6, 2025
3aa18a9
refactor: simplify error handling in time.sleep using and_then
ever0de Jul 6, 2025
72d612c
time: merge platform-specific sleep implementations
ever0de Jul 6, 2025
60163b2
remove unused imports
ever0de Jul 6, 2025
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fix(time): Handle negative sleep values
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@ever0de
ever0de committed Jul 6, 2025
commit 0e6e6b9ccb177a26d2f53c67c1afa1fb0026716b
16 changes: 13 additions & 3 deletions vm/src/convert/try_from.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ use crate::{
builtins::PyFloat,
object::{AsObject, PyObject, PyObjectRef, PyPayload, PyRef, PyResult},
};
use malachite_bigint::Sign;
use num_traits::ToPrimitive;

/// Implemented by any type that can be created from a Python object.
Expand Down Expand Up @@ -124,10 +125,19 @@ impl<'a, T: PyPayload> TryFromBorrowedObject<'a> for &'a Py<T> {
impl TryFromObject for std::time::Duration {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
if let Some(float) = obj.payload::<PyFloat>() {
Ok(Self::from_secs_f64(float.to_f64()))
let f = float.to_f64();
if f < 0.0 {
return Err(vm.new_value_error("negative duration"));
}
Ok(Self::from_secs_f64(f))
} else if let Some(int) = obj.try_index_opt(vm) {
let sec = int?
.as_bigint()
let int = int?;
let bigint = int.as_bigint();
if bigint.sign() == Sign::Minus {
return Err(vm.new_value_error("negative duration"));
}

let sec = bigint
.to_u64()
.ok_or_else(|| vm.new_value_error("value out of range"))?;
Ok(Self::from_secs(sec))
Expand Down
39 changes: 35 additions & 4 deletions vm/src/stdlib/time.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -90,8 +90,25 @@ mod decl {

#[cfg(not(unix))]
#[pyfunction]
fn sleep(dur: Duration) {
fn sleep(seconds: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
let dur = seconds.try_into_value::<Duration>(vm).map_err(|e| {
if e.class().is(vm.ctx.exceptions.value_error) {
// Check if this is a "negative duration" error by examining the args
if let Some(args) = e.args().first() {
if let Ok(s) = args.str(vm) {
if s.as_str() == "negative duration" {
return vm.new_value_error("sleep length must be non-negative");
}
}
}
e
} else {
e
}
})?;
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medium

This error mapping logic is verbose and duplicated in the unix implementation of sleep (lines 712-726). Relying on string matching for error messages can be fragile. Consider extracting this logic into a helper function to avoid duplication.

        let dur = seconds.try_into_value::<Duration>(vm).map_err(|e| {
            if e.class().is(vm.ctx.exceptions.value_error) {
                if let Some(s) = e.args().first().and_then(|arg| arg.str(vm).ok()) {
                    if s.as_str() == "negative duration" {
                        return vm.new_value_error("sleep length must be non-negative");
                    }
                }
            }
            e
        })?;


std::thread::sleep(dur);
Ok(())
}

#[cfg(not(target_os = "wasi"))]
Expand Down Expand Up @@ -525,7 +542,7 @@ mod platform {
use super::decl::{SEC_TO_NS, US_TO_NS};
#[cfg_attr(target_os = "macos", allow(unused_imports))]
use crate::{
PyObject, PyRef, PyResult, TryFromBorrowedObject, VirtualMachine,
AsObject, PyObject, PyObjectRef, PyRef, PyResult, TryFromBorrowedObject, VirtualMachine,
builtins::{PyNamespace, PyStrRef},
convert::IntoPyException,
};
Expand Down Expand Up @@ -691,8 +708,22 @@ mod platform {
}

#[pyfunction]
fn sleep(dur: Duration, vm: &VirtualMachine) -> PyResult<()> {
// this is basically std::thread::sleep, but that catches interrupts and we don't want to;
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fn sleep(seconds: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
let dur = seconds.try_into_value::<Duration>(vm).map_err(|e| {
if e.class().is(vm.ctx.exceptions.value_error) {
// Check if this is a "negative duration" error by examining the args
if let Some(args) = e.args().first() {
if let Ok(s) = args.str(vm) {
if s.as_str() == "negative duration" {
return vm.new_value_error("sleep length must be non-negative");
}
}
}
e
} else {
e
}
})?;
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medium

This duplicates the error mapping logic in the non-unix sleep function (lines 94-108). Code duplication can lead to maintenance issues. Extract this logic into a shared private helper function used by both sleep implementations.

        let dur = seconds.try_into_value::<Duration>(vm).map_err(|e| {
            if e.class().is(vm.ctx.exceptions.value_error) {
                if let Some(s) = e.args().first().and_then(|arg| arg.str(vm).ok()) {
                    if s.as_str() == "negative duration" {
                        return vm.new_value_error("sleep length must be non-negative");
                    }
                }
            }
            e
        })?;


let ts = TimeSpec::from(dur);
let res = unsafe { libc::nanosleep(ts.as_ref(), std::ptr::null_mut()) };
Expand Down
0