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Copy pathasyncgenerator.rs
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654 lines (591 loc) · 20.4 KB
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use super::{PyCode, PyGenericAlias, PyStrRef, PyType, PyTypeRef};
use crate::{
AsObject, Context, Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
builtins::PyBaseExceptionRef,
class::PyClassImpl,
common::lock::PyMutex,
coroutine::{Coro, warn_deprecated_throw_signature},
frame::FrameRef,
function::OptionalArg,
protocol::PyIterReturn,
types::{IterNext, Iterable, Representable, SelfIter},
};
use crossbeam_utils::atomic::AtomicCell;
#[pyclass(name = "async_generator", module = false)]
#[derive(Debug)]
pub struct PyAsyncGen {
inner: Coro,
running_async: AtomicCell<bool>,
// whether hooks have been initialized
ag_hooks_inited: AtomicCell<bool>,
// ag_origin_or_finalizer - stores the finalizer callback
ag_finalizer: PyMutex<Option<PyObjectRef>>,
}
type PyAsyncGenRef = PyRef<PyAsyncGen>;
impl PyPayload for PyAsyncGen {
#[inline]
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.async_generator
}
}
#[pyclass(flags(DISALLOW_INSTANTIATION), with(PyRef, Representable))]
impl PyAsyncGen {
pub const fn as_coro(&self) -> &Coro {
&self.inner
}
pub fn new(frame: FrameRef, name: PyStrRef, qualname: PyStrRef) -> Self {
Self {
inner: Coro::new(frame, name, qualname),
running_async: AtomicCell::new(false),
ag_hooks_inited: AtomicCell::new(false),
ag_finalizer: PyMutex::new(None),
}
}
/// Initialize async generator hooks.
/// Returns Ok(()) if successful, Err if firstiter hook raised an exception.
fn init_hooks(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<()> {
// = async_gen_init_hooks
if zelf.ag_hooks_inited.load() {
return Ok(());
}
zelf.ag_hooks_inited.store(true);
// Get and store finalizer from thread-local storage
let finalizer = crate::vm::thread::ASYNC_GEN_FINALIZER.with_borrow(|f| f.as_ref().cloned());
if let Some(finalizer) = finalizer {
*zelf.ag_finalizer.lock() = Some(finalizer);
}
// Call firstiter hook
let firstiter = crate::vm::thread::ASYNC_GEN_FIRSTITER.with_borrow(|f| f.as_ref().cloned());
if let Some(firstiter) = firstiter {
let obj: PyObjectRef = zelf.to_owned().into();
firstiter.call((obj,), vm)?;
}
Ok(())
}
/// Call finalizer hook if set
#[allow(dead_code)]
fn call_finalizer(zelf: &Py<Self>, vm: &VirtualMachine) {
// = gen_dealloc
let finalizer = zelf.ag_finalizer.lock().clone();
if let Some(finalizer) = finalizer
&& !zelf.inner.closed.load()
{
// Call finalizer, ignore any errors (PyErr_WriteUnraisable)
let obj: PyObjectRef = zelf.to_owned().into();
let _ = finalizer.call((obj,), vm);
}
}
#[pygetset]
fn __name__(&self) -> PyStrRef {
self.inner.name()
}
#[pygetset(setter)]
fn set___name__(&self, name: PyStrRef) {
self.inner.set_name(name)
}
#[pygetset]
fn __qualname__(&self) -> PyStrRef {
self.inner.qualname()
}
#[pygetset(setter)]
fn set___qualname__(&self, qualname: PyStrRef) {
self.inner.set_qualname(qualname)
}
#[pygetset]
fn ag_await(&self, _vm: &VirtualMachine) -> Option<PyObjectRef> {
self.inner.frame().yield_from_target()
}
#[pygetset]
fn ag_frame(&self, _vm: &VirtualMachine) -> FrameRef {
self.inner.frame()
}
#[pygetset]
fn ag_running(&self, _vm: &VirtualMachine) -> bool {
self.inner.running()
}
#[pygetset]
fn ag_code(&self, _vm: &VirtualMachine) -> PyRef<PyCode> {
self.inner.frame().code.clone()
}
#[pyclassmethod]
fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
PyGenericAlias::from_args(cls, args, vm)
}
}
#[pyclass]
impl PyRef<PyAsyncGen> {
#[pymethod]
const fn __aiter__(self, _vm: &VirtualMachine) -> Self {
self
}
#[pymethod]
fn __anext__(self, vm: &VirtualMachine) -> PyResult<PyAsyncGenASend> {
PyAsyncGen::init_hooks(&self, vm)?;
Ok(PyAsyncGenASend {
ag: self,
state: AtomicCell::new(AwaitableState::Init),
value: vm.ctx.none(),
})
}
#[pymethod]
fn asend(self, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyAsyncGenASend> {
PyAsyncGen::init_hooks(&self, vm)?;
Ok(PyAsyncGenASend {
ag: self,
state: AtomicCell::new(AwaitableState::Init),
value,
})
}
#[pymethod]
fn athrow(
self,
exc_type: PyObjectRef,
exc_val: OptionalArg,
exc_tb: OptionalArg,
vm: &VirtualMachine,
) -> PyResult<PyAsyncGenAThrow> {
PyAsyncGen::init_hooks(&self, vm)?;
Ok(PyAsyncGenAThrow {
ag: self,
aclose: false,
state: AtomicCell::new(AwaitableState::Init),
value: (
exc_type,
exc_val.unwrap_or_none(vm),
exc_tb.unwrap_or_none(vm),
),
})
}
#[pymethod]
fn aclose(self, vm: &VirtualMachine) -> PyResult<PyAsyncGenAThrow> {
PyAsyncGen::init_hooks(&self, vm)?;
Ok(PyAsyncGenAThrow {
ag: self,
aclose: true,
state: AtomicCell::new(AwaitableState::Init),
value: (
vm.ctx.exceptions.generator_exit.to_owned().into(),
vm.ctx.none(),
vm.ctx.none(),
),
})
}
}
impl Representable for PyAsyncGen {
#[inline]
fn repr_str(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<String> {
Ok(zelf.inner.repr(zelf.as_object(), zelf.get_id(), vm))
}
}
#[pyclass(module = false, name = "async_generator_wrapped_value")]
#[derive(Debug)]
pub(crate) struct PyAsyncGenWrappedValue(pub PyObjectRef);
impl PyPayload for PyAsyncGenWrappedValue {
#[inline]
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.async_generator_wrapped_value
}
}
#[pyclass]
impl PyAsyncGenWrappedValue {}
impl PyAsyncGenWrappedValue {
fn unbox(ag: &PyAsyncGen, val: PyResult<PyIterReturn>, vm: &VirtualMachine) -> PyResult {
let (closed, async_done) = match &val {
Ok(PyIterReturn::StopIteration(_)) => (true, true),
Err(e) if e.fast_isinstance(vm.ctx.exceptions.generator_exit) => (true, true),
Err(_) => (false, true),
_ => (false, false),
};
if closed {
ag.inner.closed.store(true);
}
if async_done {
ag.running_async.store(false);
}
let val = val?.into_async_pyresult(vm)?;
match_class!(match val {
val @ Self => {
ag.running_async.store(false);
Err(vm.new_stop_iteration(Some(val.0.clone())))
}
val => Ok(val),
})
}
}
#[derive(Debug, Clone, Copy)]
enum AwaitableState {
Init,
Iter,
Closed,
}
#[pyclass(module = false, name = "async_generator_asend")]
#[derive(Debug)]
pub(crate) struct PyAsyncGenASend {
ag: PyAsyncGenRef,
state: AtomicCell<AwaitableState>,
value: PyObjectRef,
}
impl PyPayload for PyAsyncGenASend {
#[inline]
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.async_generator_asend
}
}
#[pyclass(with(IterNext, Iterable))]
impl PyAsyncGenASend {
#[pymethod(name = "__await__")]
const fn r#await(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyRef<Self> {
zelf
}
#[pymethod]
fn send(&self, val: PyObjectRef, vm: &VirtualMachine) -> PyResult {
let val = match self.state.load() {
AwaitableState::Closed => {
return Err(
vm.new_runtime_error("cannot reuse already awaited __anext__()/asend()")
);
}
AwaitableState::Iter => val, // already running, all good
AwaitableState::Init => {
if self.ag.running_async.load() {
return Err(
vm.new_runtime_error("anext(): asynchronous generator is already running")
);
}
self.ag.running_async.store(true);
self.state.store(AwaitableState::Iter);
if vm.is_none(&val) {
self.value.clone()
} else {
val
}
}
};
let res = self.ag.inner.send(self.ag.as_object(), val, vm);
let res = PyAsyncGenWrappedValue::unbox(&self.ag, res, vm);
if res.is_err() {
self.close();
}
res
}
#[pymethod]
fn throw(
&self,
exc_type: PyObjectRef,
exc_val: OptionalArg,
exc_tb: OptionalArg,
vm: &VirtualMachine,
) -> PyResult {
if let AwaitableState::Closed = self.state.load() {
return Err(vm.new_runtime_error("cannot reuse already awaited __anext__()/asend()"));
}
warn_deprecated_throw_signature(&exc_val, &exc_tb, vm)?;
let res = self.ag.inner.throw(
self.ag.as_object(),
exc_type,
exc_val.unwrap_or_none(vm),
exc_tb.unwrap_or_none(vm),
vm,
);
let res = PyAsyncGenWrappedValue::unbox(&self.ag, res, vm);
if res.is_err() {
self.close();
}
res
}
#[pymethod]
fn close(&self) {
self.state.store(AwaitableState::Closed);
}
}
impl SelfIter for PyAsyncGenASend {}
impl IterNext for PyAsyncGenASend {
fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {
PyIterReturn::from_pyresult(zelf.send(vm.ctx.none(), vm), vm)
}
}
#[pyclass(module = false, name = "async_generator_athrow")]
#[derive(Debug)]
pub(crate) struct PyAsyncGenAThrow {
ag: PyAsyncGenRef,
aclose: bool,
state: AtomicCell<AwaitableState>,
value: (PyObjectRef, PyObjectRef, PyObjectRef),
}
impl PyPayload for PyAsyncGenAThrow {
#[inline]
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.async_generator_athrow
}
}
#[pyclass(with(IterNext, Iterable))]
impl PyAsyncGenAThrow {
#[pymethod(name = "__await__")]
const fn r#await(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyRef<Self> {
zelf
}
#[pymethod]
fn send(&self, val: PyObjectRef, vm: &VirtualMachine) -> PyResult {
match self.state.load() {
AwaitableState::Closed => {
Err(vm.new_runtime_error("cannot reuse already awaited aclose()/athrow()"))
}
AwaitableState::Init => {
if self.ag.running_async.load() {
self.state.store(AwaitableState::Closed);
let msg = if self.aclose {
"aclose(): asynchronous generator is already running"
} else {
"athrow(): asynchronous generator is already running"
};
return Err(vm.new_runtime_error(msg.to_owned()));
}
if self.ag.inner.closed() {
self.state.store(AwaitableState::Closed);
return Err(vm.new_stop_iteration(None));
}
if !vm.is_none(&val) {
return Err(vm.new_runtime_error(
"can't send non-None value to a just-started async generator",
));
}
self.state.store(AwaitableState::Iter);
self.ag.running_async.store(true);
let (ty, val, tb) = self.value.clone();
let ret = self.ag.inner.throw(self.ag.as_object(), ty, val, tb, vm);
let ret = if self.aclose {
if self.ignored_close(&ret) {
Err(self.yield_close(vm))
} else {
ret.and_then(|o| o.into_async_pyresult(vm))
}
} else {
PyAsyncGenWrappedValue::unbox(&self.ag, ret, vm)
};
ret.map_err(|e| self.check_error(e, vm))
}
AwaitableState::Iter => {
let ret = self.ag.inner.send(self.ag.as_object(), val, vm);
if self.aclose {
match ret {
Ok(PyIterReturn::Return(v))
if v.downcastable::<PyAsyncGenWrappedValue>() =>
{
Err(self.yield_close(vm))
}
other => other
.and_then(|o| o.into_async_pyresult(vm))
.map_err(|e| self.check_error(e, vm)),
}
} else {
PyAsyncGenWrappedValue::unbox(&self.ag, ret, vm)
}
}
}
}
#[pymethod]
fn throw(
&self,
exc_type: PyObjectRef,
exc_val: OptionalArg,
exc_tb: OptionalArg,
vm: &VirtualMachine,
) -> PyResult {
warn_deprecated_throw_signature(&exc_val, &exc_tb, vm)?;
let ret = self.ag.inner.throw(
self.ag.as_object(),
exc_type,
exc_val.unwrap_or_none(vm),
exc_tb.unwrap_or_none(vm),
vm,
);
let res = if self.aclose {
if self.ignored_close(&ret) {
Err(self.yield_close(vm))
} else {
ret.and_then(|o| o.into_async_pyresult(vm))
}
} else {
PyAsyncGenWrappedValue::unbox(&self.ag, ret, vm)
};
res.map_err(|e| self.check_error(e, vm))
}
#[pymethod]
fn close(&self) {
self.state.store(AwaitableState::Closed);
}
fn ignored_close(&self, res: &PyResult<PyIterReturn>) -> bool {
res.as_ref().is_ok_and(|v| match v {
PyIterReturn::Return(obj) => obj.downcastable::<PyAsyncGenWrappedValue>(),
PyIterReturn::StopIteration(_) => false,
})
}
fn yield_close(&self, vm: &VirtualMachine) -> PyBaseExceptionRef {
self.ag.running_async.store(false);
self.state.store(AwaitableState::Closed);
vm.new_runtime_error("async generator ignored GeneratorExit")
}
fn check_error(&self, exc: PyBaseExceptionRef, vm: &VirtualMachine) -> PyBaseExceptionRef {
self.ag.running_async.store(false);
self.state.store(AwaitableState::Closed);
if self.aclose
&& (exc.fast_isinstance(vm.ctx.exceptions.stop_async_iteration)
|| exc.fast_isinstance(vm.ctx.exceptions.generator_exit))
{
vm.new_stop_iteration(None)
} else {
exc
}
}
}
impl SelfIter for PyAsyncGenAThrow {}
impl IterNext for PyAsyncGenAThrow {
fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {
PyIterReturn::from_pyresult(zelf.send(vm.ctx.none(), vm), vm)
}
}
/// Awaitable wrapper for anext() builtin with default value.
/// When StopAsyncIteration is raised, it converts it to StopIteration(default).
#[pyclass(module = false, name = "anext_awaitable")]
#[derive(Debug)]
pub struct PyAnextAwaitable {
wrapped: PyObjectRef,
default_value: PyObjectRef,
state: AtomicCell<AwaitableState>,
}
impl PyPayload for PyAnextAwaitable {
#[inline]
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.anext_awaitable
}
}
#[pyclass(with(IterNext, Iterable))]
impl PyAnextAwaitable {
pub fn new(wrapped: PyObjectRef, default_value: PyObjectRef) -> Self {
Self {
wrapped,
default_value,
state: AtomicCell::new(AwaitableState::Init),
}
}
#[pymethod(name = "__await__")]
fn r#await(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyRef<Self> {
zelf
}
fn check_closed(&self, vm: &VirtualMachine) -> PyResult<()> {
if let AwaitableState::Closed = self.state.load() {
return Err(vm.new_runtime_error("cannot reuse already awaited __anext__()/asend()"));
}
Ok(())
}
/// Get the awaitable iterator from wrapped object.
// = anextawaitable_getiter.
fn get_awaitable_iter(&self, vm: &VirtualMachine) -> PyResult {
use crate::builtins::PyCoroutine;
use crate::protocol::PyIter;
let wrapped = &self.wrapped;
// If wrapped is already an async_generator_asend, it's an iterator
if wrapped.class().is(vm.ctx.types.async_generator_asend)
|| wrapped.class().is(vm.ctx.types.async_generator_athrow)
{
return Ok(wrapped.clone());
}
// _PyCoro_GetAwaitableIter equivalent
let awaitable = if wrapped.class().is(vm.ctx.types.coroutine_type) {
// Coroutine - get __await__ later
wrapped.clone()
} else {
// Try to get __await__ method
if let Some(await_method) = vm.get_method(wrapped.clone(), identifier!(vm, __await__)) {
await_method?.call((), vm)?
} else {
return Err(vm.new_type_error(format!(
"object {} can't be used in 'await' expression",
wrapped.class().name()
)));
}
};
// If awaitable is a coroutine, get its __await__
if awaitable.class().is(vm.ctx.types.coroutine_type) {
let coro_await = vm.call_method(&awaitable, "__await__", ())?;
// Check that __await__ returned an iterator
if !PyIter::check(&coro_await) {
return Err(vm.new_type_error("__await__ returned a non-iterable"));
}
return Ok(coro_await);
}
// Check the result is an iterator, not a coroutine
if awaitable.downcast_ref::<PyCoroutine>().is_some() {
return Err(vm.new_type_error("__await__() returned a coroutine"));
}
// Check that the result is an iterator
if !PyIter::check(&awaitable) {
return Err(vm.new_type_error(format!(
"__await__() returned non-iterator of type '{}'",
awaitable.class().name()
)));
}
Ok(awaitable)
}
#[pymethod]
fn send(&self, val: PyObjectRef, vm: &VirtualMachine) -> PyResult {
self.check_closed(vm)?;
self.state.store(AwaitableState::Iter);
let awaitable = self.get_awaitable_iter(vm)?;
let result = vm.call_method(&awaitable, "send", (val,));
self.handle_result(result, vm)
}
#[pymethod]
fn throw(
&self,
exc_type: PyObjectRef,
exc_val: OptionalArg,
exc_tb: OptionalArg,
vm: &VirtualMachine,
) -> PyResult {
self.check_closed(vm)?;
warn_deprecated_throw_signature(&exc_val, &exc_tb, vm)?;
self.state.store(AwaitableState::Iter);
let awaitable = self.get_awaitable_iter(vm)?;
let result = vm.call_method(
&awaitable,
"throw",
(
exc_type,
exc_val.unwrap_or_none(vm),
exc_tb.unwrap_or_none(vm),
),
);
self.handle_result(result, vm)
}
#[pymethod]
fn close(&self, vm: &VirtualMachine) -> PyResult<()> {
self.state.store(AwaitableState::Closed);
if let Ok(awaitable) = self.get_awaitable_iter(vm) {
let _ = vm.call_method(&awaitable, "close", ());
}
Ok(())
}
/// Convert StopAsyncIteration to StopIteration(default_value)
fn handle_result(&self, result: PyResult, vm: &VirtualMachine) -> PyResult {
match result {
Ok(value) => Ok(value),
Err(exc) if exc.fast_isinstance(vm.ctx.exceptions.stop_async_iteration) => {
Err(vm.new_stop_iteration(Some(self.default_value.clone())))
}
Err(exc) => Err(exc),
}
}
}
impl SelfIter for PyAnextAwaitable {}
impl IterNext for PyAnextAwaitable {
fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {
PyIterReturn::from_pyresult(zelf.send(vm.ctx.none(), vm), vm)
}
}
pub fn init(ctx: &Context) {
PyAsyncGen::extend_class(ctx, ctx.types.async_generator);
PyAsyncGenASend::extend_class(ctx, ctx.types.async_generator_asend);
PyAsyncGenAThrow::extend_class(ctx, ctx.types.async_generator_athrow);
PyAnextAwaitable::extend_class(ctx, ctx.types.anext_awaitable);
}