mirror of
https://gitlab.com/fabinfra/fabaccess/bffh.git
synced 2024-11-11 10:03:23 +01:00
593 lines
19 KiB
Rust
593 lines
19 KiB
Rust
use core::{
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ptr,
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};
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use std::{
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fmt,
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any::Any,
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hash::Hash,
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str::FromStr,
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};
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use rkyv::{Archive, Archived, Serialize, Deserialize, out_field, Fallible, DeserializeUnsized, ArchivePointee, ArchiveUnsized, ArchivedMetadata, SerializeUnsized, };
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use rkyv_dyn::{DynSerializer, DynError, DynDeserializer};
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use rkyv_typename::TypeName;
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use ptr_meta::{DynMetadata, Pointee};
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use inventory;
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use crate::utils::oid::{ObjectIdentifier};
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use rkyv::ser::{Serializer, ScratchSpace};
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use std::collections::HashMap;
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use std::alloc::Layout;
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use serde::ser::SerializeMap;
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use std::fmt::Formatter;
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use serde::de::Error as SerdeError;
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use std::mem::MaybeUninit;
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/// Adding a custom type to BFFH state management:
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///
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/// 1. Implement `serde`'s [`Serialize`](serde::Serialize) and [`Deserialize`](serde::Deserialize)
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/// - `derive()`d instances work just fine, but keep stability over releases in mind.
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/// 2. Implement rkyv's [`Serialize`](rkyv::Serialize).
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/// 3. Implement TypeOid on your Archived type (i.e. `<T as Archive>::Archived`)
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/// 4. Implement this
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pub trait Value: Any + fmt::Debug + erased_serde::Serialize + Sync {
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/// Initialize `&mut self` from `deserializer`
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///
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/// At the point this is called &mut self is of undefined value but guaranteed to be well
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/// aligned and non-null. Any read access into &mut self before all of &self is brought into
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/// a valid state is however undefined behaviour.
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/// To this end you *must* initialize `self` **completely**. Serde will do the right thing if
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/// you directly deserialize the type you're implementing `Value` for, but for manual
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/// implementations this is important to keep in mind.
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fn deserialize_init<'de>(&mut self, deserializer: &mut dyn erased_serde::Deserializer<'de>)
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-> Result<(), erased_serde::Error>;
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/// Implement `PartialEq` dynamically.
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///
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/// This should return `true` iff the Value is of the same type and `self` == `other` for
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/// non-dynamic types would return `true`.
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/// It is safe to always return `false`.
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fn dyn_eq(&self, other: &dyn Value) -> bool;
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fn as_value(&self) -> &dyn Value;
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fn as_any(&self) -> &dyn Any;
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}
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erased_serde::serialize_trait_object!(Value);
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erased_serde::serialize_trait_object!(SerializeValue);
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erased_serde::serialize_trait_object!(DeserializeValue);
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impl<T> Value for T
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where T: Any + fmt::Debug + PartialEq + Sync
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+ erased_serde::Serialize
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+ for<'de> serde::Deserialize<'de>
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{
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fn deserialize_init<'de>(&mut self, deserializer: &mut dyn erased_serde::Deserializer<'de>)
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-> Result<(), erased_serde::Error>
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{
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*self = erased_serde::deserialize(deserializer)?;
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Ok(())
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}
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fn dyn_eq(&self, other: &dyn Value) -> bool {
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other.as_any().downcast_ref().map_or(false, |other: &T| other == self)
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}
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fn as_value(&self) -> &dyn Value {
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self
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}
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fn as_any(&self) -> &dyn Any {
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self
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}
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}
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impl PartialEq for dyn Value {
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fn eq(&self, other: &Self) -> bool {
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self.dyn_eq(other)
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}
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}
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#[repr(transparent)]
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pub(super) struct DynVal<'a>(pub &'a dyn SerializeValue);
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impl<'a> serde::Serialize for DynVal<'a> {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where S: serde::Serializer
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{
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let mut ser = serializer.serialize_map(Some(1))?;
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let oid = self.0.archived_type_oid();
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ser.serialize_entry(oid, self.0)?;
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ser.end()
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}
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}
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#[repr(transparent)]
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pub(super) struct DynOwnedVal(pub Box<dyn SerializeValue>);
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impl<'de> serde::Deserialize<'de> for DynOwnedVal {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where D: serde::Deserializer<'de>
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{
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deserializer.deserialize_map(DynValVisitor)
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}
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}
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struct DynValVisitor;
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impl<'de> serde::de::Visitor<'de> for DynValVisitor {
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type Value = DynOwnedVal;
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fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
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write!(formatter, "an one entry map from OID to some value object")
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}
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fn visit_map<A: serde::de::MapAccess<'de>>(self, mut map: A) -> Result<Self::Value, A::Error>
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{
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// Bad magic code. Problem we have to solve: We only know how to parse whatever comes
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// after the OID after having looked at the OID. We have zero static type info available
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// during deserialization. So:
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// Get OID first. That's easy, we know it's the key, we know how to read it.
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let oid: ObjectIdentifier = map.next_key()?
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.ok_or(A::Error::missing_field("oid"))?;
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// Get the Value vtable for that OID. Or fail because we don't know that OID, either works.
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let valimpl = IMPL_REGISTRY.get(ImplId::from_type_oid(&oid))
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.ok_or(serde::de::Error::invalid_value(
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serde::de::Unexpected::Other("unknown oid"),
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&"oid an implementation was registered for",
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))?;
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// Casting random usize you find on the side of the road as vtable on unchecked pointers.
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// What could possibly go wrong? >:D
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let valbox: MaybeUninit<Box<dyn SerializeValue>> = unsafe {
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// "recreate" vtable as fat ptr metadata (we literally just cast an `usize` but the
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// only way to put this usize into that spot is by having a valid vtable cast so it's
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// probably almost safe)
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let meta = valimpl.pointer_metadata();
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// Don't bother checking here. The only way this could be bad is if the vtable above
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// is bad an in that case a segfault here would be *much better* than whatever is
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// going to happen afterwards.
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let layout = Layout::from_size_align_unchecked(meta.size_of(), meta.align_of());
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// Hello yes I would like a Box the old fashioned way.
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// Oh you're asking why we're allocating stuff here and never ever bother zeroing or
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// validate in any other way if this is sane?
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// Well...
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let ptr: *mut () = std::alloc::alloc(layout).cast::<()>();
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let b = Box::from_raw(ptr_meta::from_raw_parts_mut(
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ptr,
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meta));
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// We make this a MaybeUninit so `Drop` is never called on the uninitialized value
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MaybeUninit::new(b)
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};
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// ... The only way we can make Value a trait object by having it deserialize *into
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// it's own uninitialized representation*. Yeah don't worry, this isn't the worst part of
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// the game yet. >:D
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let seed = InitIntoSelf(valbox);
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let val = map.next_value_seed(seed)?;
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Ok(DynOwnedVal(val))
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}
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}
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struct InitIntoSelf(MaybeUninit<Box<dyn SerializeValue>>);
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impl<'de> serde::de::DeserializeSeed<'de> for InitIntoSelf {
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type Value = Box<dyn SerializeValue>;
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fn deserialize<D>(mut self, deserializer: D) -> Result<Self::Value, D::Error>
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where D: serde::Deserializer<'de>
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{
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let mut deser = <dyn erased_serde::Deserializer>::erase(deserializer);
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// Unsafe as hell but if we never read from this reference before initializing it's not
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// undefined behaviour.
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let selfptr = unsafe { &mut *self.0.as_mut_ptr() };
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// Hey, better initialize late than never.
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selfptr.deserialize_init(&mut deser).map_err(|e|
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D::Error::custom(e))?;
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// Assuming `deserialize_init` didn't error and did its job this is now safe.
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unsafe { Ok(self.0.assume_init()) }
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}
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}
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pub trait TypeOid {
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fn type_oid() -> &'static ObjectIdentifier;
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fn type_name() -> &'static str;
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fn type_desc() -> &'static str;
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}
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impl<S: ScratchSpace + Serializer + ?Sized> SerializeUnsized<S> for dyn SerializeValue {
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fn serialize_unsized(&self, mut serializer: &mut S) -> Result<usize, S::Error> {
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self.serialize_dynoid(&mut serializer)
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.map_err(|e| *e.downcast::<S::Error>().unwrap())
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}
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fn serialize_metadata(&self, serializer: &mut S) -> Result<Self::MetadataResolver, S::Error> {
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let oid = self.archived_type_oid();
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oid.serialize(serializer)
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}
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}
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/// Serialize dynamic types by storing an OID alongside
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pub trait SerializeDynOid {
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fn serialize_dynoid(&self, serializer: &mut dyn DynSerializer) -> Result<usize, DynError>;
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fn archived_type_oid(&self) -> &'static ObjectIdentifier;
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}
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impl<T> SerializeDynOid for T
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where T: for<'a> Serialize<dyn DynSerializer + 'a>,
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T::Archived: TypeOid,
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{
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fn serialize_dynoid(&self, serializer: &mut dyn DynSerializer) -> Result<usize, DynError> {
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serializer.serialize_value(self)
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}
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fn archived_type_oid(&self) -> &'static ObjectIdentifier {
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Archived::<T>::type_oid()
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}
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}
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pub trait DeserializeDynOid {
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unsafe fn deserialize_dynoid(
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&self,
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deserializer: &mut dyn DynDeserializer,
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alloc: &mut dyn FnMut(Layout) -> *mut u8,
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) -> Result<*mut (), DynError>;
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fn deserialize_dynoid_metadata(
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&self,
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deserializer: &mut dyn DynDeserializer,
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) -> Result<<dyn SerializeValue as Pointee>::Metadata, DynError>;
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}
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#[ptr_meta::pointee]
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pub trait SerializeValue: Value + SerializeDynOid {
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fn dyn_clone(&self) -> Box<dyn SerializeValue>;
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}
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impl<T: Archive + Value + SerializeDynOid + Clone> SerializeValue for T
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where
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T::Archived: RegisteredImpl
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{
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fn dyn_clone(&self) -> Box<dyn SerializeValue> {
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Box::new(self.clone())
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}
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}
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impl PartialEq for dyn SerializeValue {
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fn eq(&self, other: &Self) -> bool {
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self.dyn_eq(other.as_value())
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}
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}
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impl Clone for Box<dyn SerializeValue> {
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fn clone(&self) -> Self {
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self.dyn_clone()
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}
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}
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#[ptr_meta::pointee]
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pub trait DeserializeValue: Value + DeserializeDynOid {}
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impl<T: Value + DeserializeDynOid> DeserializeValue for T {}
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impl ArchivePointee for dyn DeserializeValue {
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type ArchivedMetadata = ArchivedValueMetadata;
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fn pointer_metadata(archived: &Self::ArchivedMetadata) -> <Self as Pointee>::Metadata {
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archived.pointer_metadata()
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}
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}
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impl<D: Fallible + ?Sized> DeserializeUnsized<dyn SerializeValue, D> for dyn DeserializeValue {
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unsafe fn deserialize_unsized(&self,
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mut deserializer: &mut D,
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mut alloc: impl FnMut(Layout) -> *mut u8
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) -> Result<*mut (), D::Error> {
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self.deserialize_dynoid(&mut deserializer, &mut alloc).map_err(|e| *e.downcast().unwrap())
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}
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fn deserialize_metadata(&self, mut deserializer: &mut D)
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-> Result<<dyn SerializeValue as Pointee>::Metadata, D::Error>
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{
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self.deserialize_dynoid_metadata(&mut deserializer).map_err(|e| *e.downcast().unwrap())
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}
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}
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impl ArchiveUnsized for dyn SerializeValue {
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type Archived = dyn DeserializeValue;
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type MetadataResolver = <ObjectIdentifier as Archive>::Resolver;
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unsafe fn resolve_metadata(&self, pos: usize, resolver: Self::MetadataResolver, out: *mut ArchivedMetadata<Self>) {
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let (oid_pos, oid) = out_field!(out.type_oid);
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let type_oid = self.archived_type_oid();
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type_oid.resolve(pos + oid_pos, resolver, oid);
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}
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}
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#[derive(Debug)]
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pub struct ArchivedValueMetadata {
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pub type_oid: Archived<ObjectIdentifier>,
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}
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impl ArchivedValueMetadata {
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pub unsafe fn emplace(type_oid: Archived<ObjectIdentifier>, out: *mut Self) {
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let p = ptr::addr_of_mut!((*out).type_oid);
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ptr::write(p, type_oid);
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}
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pub fn vtable(&self) -> usize {
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IMPL_REGISTRY
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.get(ImplId::from_type_oid(&self.type_oid)).expect(&format!("Unregistered \
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type \
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oid \
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{:?}", self.type_oid))
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.vtable
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}
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pub fn pointer_metadata(&self) -> DynMetadata<dyn DeserializeValue> {
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unsafe { core::mem::transmute(self.vtable()) }
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}
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}
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#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq)]
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pub struct ImplId<'a> {
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type_oid: &'a [u8],
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}
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impl<'a> ImplId<'a> {
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pub fn from_type_oid(type_oid: &'a [u8]) -> Self {
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Self { type_oid }
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}
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}
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impl ImplId<'static> {
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fn new<T: TypeOid>() -> Self {
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Self {
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type_oid: &T::type_oid()
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}
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}
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}
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#[derive(Copy, Clone, Debug)]
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struct ImplData<'a> {
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pub vtable: usize,
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pub name: &'a str,
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pub desc: &'a str,
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pub info: ImplDebugInfo,
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}
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#[derive(Copy, Clone, Debug)]
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#[doc(hidden)]
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pub struct ImplDebugInfo {
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pub file: &'static str,
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pub line: u32,
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pub column: u32,
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}
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macro_rules! debug_info {
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() => {
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ImplDebugInfo {
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file: core::file!(),
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line: core::line!(),
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column: core::column!(),
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}
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}
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}
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impl ImplData<'_> {
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pub unsafe fn pointer_metadata<T: ?Sized>(&self) -> DynMetadata<T> {
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core::mem::transmute(self.vtable)
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}
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}
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#[derive(Debug)]
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pub struct ImplEntry<'a> {
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id: ImplId<'a>,
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data: ImplData<'a>,
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}
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inventory::collect!(ImplEntry<'static>);
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impl ImplEntry<'_> {
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#[doc(hidden)]
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pub fn new<T: TypeOid + RegisteredImpl>() -> Self {
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Self {
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id: ImplId::new::<T>(),
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data: ImplData {
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vtable: <T as RegisteredImpl>::vtable(),
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name: <T as TypeOid>::type_name(),
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desc: <T as TypeOid>::type_desc(),
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info: <T as RegisteredImpl>::debug_info(),
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},
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}
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}
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}
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#[derive(Debug)]
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struct ImplRegistry {
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oid_to_data: HashMap<ImplId<'static>, ImplData<'static>>,
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}
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impl ImplRegistry {
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fn new() -> Self {
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Self { oid_to_data: HashMap::new() }
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}
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fn add_entry(&mut self, entry: &'static ImplEntry) {
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let old_val = self.oid_to_data.insert(entry.id, entry.data);
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if let Some(old) = old_val {
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eprintln!("Value impl oid conflict for {:?}", entry.id.type_oid);
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eprintln!("Existing impl registered at {}:{}:{}",
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old.info.file, old.info.line, old.info.column);
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eprintln!("New impl registered at {}:{}:{}",
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entry.data.info.file, entry.data.info.line, entry.data.info.column);
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}
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assert!(old_val.is_none());
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}
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fn get(&self, type_oid: ImplId) -> Option<ImplData> {
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self.oid_to_data.get(&type_oid).map(|d| *d)
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}
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}
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lazy_static::lazy_static! {
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// FIXME: Dynamic modules *will* break this.
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static ref IMPL_REGISTRY: ImplRegistry = {
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let mut reg = ImplRegistry::new();
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for entry in inventory::iter::<ImplEntry> {
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reg.add_entry(entry);
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}
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reg
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};
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}
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pub unsafe trait RegisteredImpl {
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fn vtable() -> usize;
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fn debug_info() -> ImplDebugInfo;
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}
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macro_rules! oiddeser {
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( $y:ty, $z:ty ) => {
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impl DeserializeDynOid for $y
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where $y: for<'a> Deserialize<$z, (dyn DynDeserializer + 'a)>
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{
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unsafe fn deserialize_dynoid(&self, deserializer: &mut dyn DynDeserializer, alloc: &mut dyn FnMut(Layout) -> *mut u8) -> Result<*mut (), DynError> {
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let ptr = alloc(Layout::new::<$z>()).cast::<$z>();
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ptr.write(self.deserialize(deserializer)?);
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Ok(ptr as *mut ())
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}
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fn deserialize_dynoid_metadata(&self, _: &mut dyn DynDeserializer) -> Result<<dyn
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SerializeValue as Pointee>::Metadata, DynError> {
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unsafe {
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Ok(core::mem::transmute(ptr_meta::metadata(
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core::ptr::null::<$z>() as *const dyn SerializeValue
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)))
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}
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}
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}
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}
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}
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macro_rules! oidvalue {
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( $x:ident, $y:ty ) => {
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oidvalue! {$x, $y, $y}
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};
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( $x:ident, $y:ty, $z:ty ) => {
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oiddeser! {$z, $y}
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impl TypeOid for $z {
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fn type_oid() -> &'static ObjectIdentifier {
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&$x
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}
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fn type_name() -> &'static str {
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stringify!($y)
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}
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fn type_desc() -> &'static str {
|
|
"builtin"
|
|
}
|
|
}
|
|
unsafe impl RegisteredImpl for $z {
|
|
fn vtable() -> usize {
|
|
unsafe {
|
|
core::mem::transmute(ptr_meta::metadata(
|
|
core::ptr::null::<$z>() as *const dyn DeserializeValue
|
|
))
|
|
}
|
|
}
|
|
fn debug_info() -> ImplDebugInfo {
|
|
debug_info!()
|
|
}
|
|
}
|
|
|
|
inventory::submit! {ImplEntry::new::<$z>()}
|
|
}
|
|
}
|
|
|
|
lazy_static::lazy_static! {
|
|
pub static ref OID_BOOL: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.1").unwrap()
|
|
};
|
|
pub static ref OID_U8: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.2").unwrap()
|
|
};
|
|
pub static ref OID_U16: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.3").unwrap()
|
|
};
|
|
pub static ref OID_U32: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.4").unwrap()
|
|
};
|
|
pub static ref OID_U64: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.5").unwrap()
|
|
};
|
|
pub static ref OID_U128: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.6").unwrap()
|
|
};
|
|
pub static ref OID_I8: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.7").unwrap()
|
|
};
|
|
pub static ref OID_I16: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.8").unwrap()
|
|
};
|
|
pub static ref OID_I32: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.9").unwrap()
|
|
};
|
|
pub static ref OID_I64: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.10").unwrap()
|
|
};
|
|
pub static ref OID_I128: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.11").unwrap()
|
|
};
|
|
pub static ref OID_VEC3U8: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.1.13").unwrap()
|
|
};
|
|
|
|
pub static ref OID_POWERED: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.2.1").unwrap()
|
|
};
|
|
pub static ref OID_INTENSITY: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.2.2").unwrap()
|
|
};
|
|
pub static ref OID_COLOUR: ObjectIdentifier = {
|
|
ObjectIdentifier::from_str("1.3.6.1.4.1.48398.612.2.3").unwrap()
|
|
};
|
|
}
|
|
oidvalue!(OID_BOOL, bool);
|
|
oidvalue!(OID_U8, u8);
|
|
oidvalue!(OID_U16, u16);
|
|
oidvalue!(OID_U32, u32);
|
|
oidvalue!(OID_U64, u64);
|
|
oidvalue!(OID_U128, u128);
|
|
oidvalue!(OID_I8, i8);
|
|
oidvalue!(OID_I16, i16);
|
|
oidvalue!(OID_I32, i32);
|
|
oidvalue!(OID_I64, i64);
|
|
oidvalue!(OID_I128, i128);
|
|
|
|
#[derive(serde::Serialize, serde::Deserialize)]
|
|
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, rkyv::Archive, rkyv::Serialize, rkyv::Deserialize)]
|
|
#[archive_attr(derive(TypeName, Debug, PartialEq, serde::Serialize, serde::Deserialize))]
|
|
pub struct Vec3u8 {
|
|
pub a: u8,
|
|
pub b: u8,
|
|
pub c: u8,
|
|
}
|
|
oidvalue!(OID_VEC3U8, Vec3u8, ArchivedVec3u8);
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use rand::Rng;
|
|
use rand::distributions::Standard;
|
|
use rand::prelude::Distribution;
|
|
|
|
impl Distribution<Vec3u8> for Standard {
|
|
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Vec3u8 {
|
|
let a = self.sample(rng);
|
|
let b = self.sample(rng);
|
|
let c = self.sample(rng);
|
|
Vec3u8 { a, b, c }
|
|
}
|
|
}
|
|
} |