use dope_sys::{
io::{Close as _, Retry as _},
kernel, memory,
memory::{
Failure as _,
buffer::{provided, provided::Cleanup as _},
},
probe::{cleanup, cleanup::Cleanup as _},
ring::{create, create::Build as _, map, map::Unmap as _, register::Registration as _},
table::token,
};
use crate::{
BufferBuild, Fault, Primary, Ring, error,
reactor::{
buffers::{self, Canary, Cleanup, Producer},
register, ring,
ring::Recover,
},
};
pub struct Resources<T: token::Codec, L: memory::raw::Canary, P>(State<T, L, P>);
pub struct Build<T: token::Codec, L: memory::raw::Canary, P>(Result<P, Pending<T, L, P>>);
enum State<T: token::Codec, L: memory::raw::Canary, P> {
Ring(ring::Cleanup),
Probe(Recover<T, L, P>),
Unbound(Pending<T, L, P>),
Bound {
pending: Pending<T, L, P>,
context: buffers::raw::Context<L>,
},
}
enum Pending<T: token::Codec, L: memory::raw::Canary, P> {
Buffers(BufferBuild<L, P>),
Open(Open<T, L, P>),
Raw(Closed<T, P>),
Provided(Provided<T, L, P>),
Registration(Registration<T, L>),
}
struct Open<T, L: memory::raw::Canary, P> {
ring: Ring<T>,
buffers: BufferBuild<L, P>,
}
struct Closed<T, P> {
primary: P,
current: ring::Closing<T>,
}
struct Provided<T, L: memory::raw::Canary, P> {
primary: P,
current: register::raw::Retained<T>,
buffers: Producer<L>,
}
struct Registration<T, L: memory::raw::Canary> {
current: register::Cleanup<T>,
buffers: Producer<L>,
}
impl<T: token::Codec, L: memory::raw::Canary, P> From<ring::Cleanup> for Resources<T, L, P> {
fn from(state: ring::Cleanup) -> Self {
Self(State::Ring(state))
}
}
impl<T: token::Codec, L: memory::raw::Canary, P: Copy + From<Primary> + From<memory::Error>>
create::Retain<P> for Resources<T, L, P>
{
type Build = Build<T, L, P>;
type Ring = Ring<T>;
type Probe = Recover<T, L, P>;
type Canary = Canary<L>;
type Context = buffers::raw::Context<L>;
type Buffers = Cleanup<L>;
type Producer = Producer<L>;
type Registration = register::Attempt<T>;
type Registered = register::raw::Registered<T>;
type BufferError = kernel::Errno<error::Register<22>>;
fn probe(state: Recover<T, L, P>) -> Self {
Self(State::Probe(state))
}
fn open<F: provided::Failure<Cleanup = Cleanup<L>>>(ring: Ring<T>, fault: F) -> Self::Build {
let (error, cleanup) = fault.into_parts();
let primary = P::from(error);
match cleanup {
Some(cleanup) => Build(Err(Pending::Open(Open {
ring,
buffers: BufferBuild::new(cleanup, primary),
}))),
None => Pending::close_raw(ring, primary),
}
}
fn canary(ring: Ring<T>, primary: P, buffers: Canary<L>) -> Result<P, Self> {
let cleanup = match buffers.try_close() {
Ok(()) => return Pending::close_raw(ring, primary).into_result(),
Err(cleanup) => cleanup,
};
Err(Self::unmap(ring, primary, cleanup))
}
fn unmap(ring: Ring<T>, primary: P, cleanup: Cleanup<L>) -> Self {
Self(State::Unbound(Pending::Open(Open {
ring,
buffers: BufferBuild::new(cleanup, primary),
})))
}
fn registration(state: register::Attempt<T>, buffers: Producer<L>) -> Self::Build {
let result = match state.try_close() {
Ok(error) => Pending::<T, L, P>::close(Primary::Register(error).into(), buffers)
.map_err(Pending::Buffers),
Err(current) => Err(Pending::Registration(Registration { current, buffers })),
};
Build(result)
}
fn provided(
cause: Self::BufferError,
ring: Self::Registered,
buffers: Producer<L>,
) -> Self::Build {
let primary = Primary::Provided(cause).into();
let result = match ring.try_close() {
Ok(()) => Pending::<T, L, P>::close(primary, buffers).map_err(Pending::Buffers),
Err(current) => Err(Pending::Provided(Provided {
primary,
current,
buffers,
})),
};
Build(result)
}
}
impl<T: token::Codec, L: memory::raw::Canary, P: Copy + From<Primary> + From<memory::Error>>
create::Build<P> for Build<T, L, P>
{
type Context = buffers::raw::Context<L>;
type Cleanup = Resources<T, L, P>;
fn into_result(self) -> Result<P, Self::Cleanup> {
self.0.map_err(|pending| Resources(State::Unbound(pending)))
}
fn close(self, context: buffers::raw::Context<L>) -> Result<P, Self::Cleanup> {
match self.0 {
Ok(primary) => Pending::<T, L, P>::context(primary, context)
.map_err(|pending| Resources(State::Unbound(Pending::Buffers(pending)))),
Err(pending) => Err(Resources(State::Bound { pending, context })),
}
}
}
impl<T: token::Codec, L: memory::raw::Canary, P: Copy + From<Primary> + From<memory::Error>>
memory::Cleanup<P> for Resources<T, L, P>
{
type Error = Fault<T>;
fn try_close(self, mut report: impl FnMut(Fault<T>)) -> Result<P, Self> {
match self.0 {
State::Ring(state) => state
.try_close(|cause| report(create::Failure::Storage(map::Storage::Ring(cause))))
.map(|cause| Primary::Ring(cause).into())
.map_err(|state| Self(State::Ring(state))),
State::Probe(state) => state
.try_close(|cause| report(probe_error(cause)))
.map_err(|state| Self(State::Probe(state))),
State::Unbound(pending) => pending
.try_close(&mut report)
.map_err(|pending| Self(State::Unbound(pending))),
State::Bound { pending, context } => match pending.try_close(&mut report) {
Ok(primary) => Pending::<T, L, P>::context(primary, context)
.map_err(|pending| Self(State::Unbound(Pending::Buffers(pending)))),
Err(pending) => Err(Self(State::Bound { pending, context })),
},
}
}
fn primary(&self) -> P {
match &self.0 {
State::Ring(state) => Primary::Ring(state.primary()).into(),
State::Probe(state) => state.primary(),
State::Unbound(pending) | State::Bound { pending, .. } => pending.primary(),
}
}
fn failure(&self) -> Fault<T> {
match &self.0 {
State::Ring(state) => create::Failure::Storage(map::Storage::Ring(state.failure())),
State::Probe(state) => probe_error(state.failure()),
State::Unbound(pending) | State::Bound { pending, .. } => pending.failure(),
}
}
}
impl<T: token::Codec, L: memory::raw::Canary, P: Copy + From<Primary> + From<memory::Error>>
memory::Cleanup<P> for Pending<T, L, P>
{
type Error = Fault<T>;
fn try_close(self, mut report: impl FnMut(Fault<T>)) -> Result<P, Self> {
match self {
Self::Buffers(state) => Self::retry_buffer(state, &mut report).map_err(Self::Buffers),
Self::Open(Open { ring, buffers }) => match Self::retry_buffer(buffers, &mut report) {
Ok(primary) => Self::close_raw(ring, primary).0,
Err(buffers) => Err(Self::Open(Open { ring, buffers })),
},
Self::Raw(Closed { primary, current }) => {
let (owner, cause) = current.recover().into_parts();
report(create::Failure::Storage(cause.into()));
match owner.try_close() {
Ok(()) => Ok(primary),
Err(current) => Err(Self::Raw(Closed { primary, current })),
}
}
Self::Provided(Provided {
primary,
current,
buffers,
}) => {
let (owner, cause) = current.recover().into_parts();
report(create::Failure::Storage(cause));
match owner.try_close() {
Ok(()) => Self::close(primary, buffers).map_err(Self::Buffers),
Err(current) => Err(Self::Provided(Provided {
primary,
current,
buffers,
})),
}
}
Self::Registration(Registration { current, buffers }) => match current
.try_close(|cause| report(create::Failure::Storage(map::Storage::Ring(cause))))
{
Ok(cause) => {
Self::close(Primary::Register(cause).into(), buffers).map_err(Self::Buffers)
}
Err(current) => Err(Self::Registration(Registration { current, buffers })),
},
}
}
fn primary(&self) -> P {
match self {
Self::Buffers(state) => *state.error(),
Self::Open(Open { buffers, .. }) => *buffers.error(),
Self::Raw(Closed { primary, .. }) | Self::Provided(Provided { primary, .. }) => {
*primary
}
Self::Registration(Registration { current, .. }) => {
Primary::Register(current.primary()).into()
}
}
}
fn failure(&self) -> Fault<T> {
match self {
Self::Buffers(state) => create::Failure::Memory(state.value().failure()),
Self::Open(Open { buffers, .. }) => create::Failure::Memory(buffers.value().failure()),
Self::Raw(Closed { current, .. }) => create::Failure::Storage(current.failure()),
Self::Provided(Provided { current, .. }) => create::Failure::Storage(current.failure()),
Self::Registration(Registration { current, .. }) => {
create::Failure::Storage(map::Storage::Ring(current.failure()))
}
}
}
}
impl<T: token::Codec, L: memory::raw::Canary, P: Copy + From<Primary> + From<memory::Error>>
Pending<T, L, P>
{
fn retry_buffer(
state: BufferBuild<L, P>,
report: &mut impl FnMut(Fault<T>),
) -> Result<P, BufferBuild<L, P>> {
let (cleanup, primary) = state.into_parts();
let (owner, cause) = cleanup.recover().into_parts();
report(create::Failure::Memory(cause));
let cleanup = match owner.try_close() {
Ok(()) => return Ok(primary),
Err(cleanup) => cleanup,
};
Err(BufferBuild::new(cleanup, primary))
}
fn close_raw(ring: Ring<T>, primary: P) -> Build<T, L, P> {
match ring.try_close() {
Ok(()) => Build(Ok(primary)),
Err(current) => Build(Err(Self::Raw(Closed { primary, current }))),
}
}
fn close(primary: P, buffers: Producer<L>) -> Result<P, BufferBuild<L, P>> {
Self::buffers(primary, buffers.try_close().map_err(Cleanup::producer))
}
fn context(primary: P, context: buffers::raw::Context<L>) -> Result<P, BufferBuild<L, P>> {
Self::buffers(primary, context.try_close().map_err(Cleanup::payload))
}
fn buffers(primary: P, closed: Result<(), Cleanup<L>>) -> Result<P, BufferBuild<L, P>> {
let cleanup = match closed {
Ok(()) => return Ok(primary),
Err(cleanup) => cleanup,
};
Err(BufferBuild::new(cleanup, primary))
}
}
fn probe_error<S, W>(cause: cleanup::Failure<S, W>) -> create::Failure<S, W> {
match cause {
cleanup::Failure::Storage(error) => create::Failure::Storage(error),
cleanup::Failure::Wait(error) => create::Failure::Wait(error),
}
}