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use std::{
any::Any,
fmt::{Debug, Display},
hash::Hash,
ops::Deref,
};
use anyhow::Result;
use serde::{Deserialize, Serialize, ser::SerializeTuple};
use unsize::CoerceUnsize;
use crate::{
ValueTypeId, registry,
triomphe_utils::{coerce_to_any_send_sync, downcast_triomphe_arc},
};
/// A reference to a piece of data
#[derive(Clone)]
pub struct SharedReference(pub triomphe::Arc<dyn Any + Send + Sync>);
impl SharedReference {
pub fn new(data: triomphe::Arc<impl Any + Send + Sync>) -> Self {
Self(data.unsize(coerce_to_any_send_sync()))
}
}
/// A reference to a piece of data with type information
#[derive(Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub struct TypedSharedReference {
pub type_id: ValueTypeId,
pub reference: SharedReference,
}
impl SharedReference {
pub fn downcast<T: Any + Send + Sync>(self) -> Result<triomphe::Arc<T>, Self> {
match downcast_triomphe_arc(self.0) {
Ok(data) => Ok(data),
Err(data) => Err(Self(data)),
}
}
pub fn downcast_ref<T: Any>(&self) -> Option<&T> {
self.0.downcast_ref()
}
pub fn into_typed(self, type_id: ValueTypeId) -> TypedSharedReference {
TypedSharedReference {
type_id,
reference: self,
}
}
}
impl TypedSharedReference {
pub fn into_untyped(self) -> SharedReference {
self.reference
}
}
impl Deref for TypedSharedReference {
type Target = SharedReference;
fn deref(&self) -> &Self::Target {
&self.reference
}
}
impl Hash for SharedReference {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
Hash::hash(&(&*self.0 as *const (dyn Any + Send + Sync)), state)
}
}
impl PartialEq for SharedReference {
// Must compare with PartialEq rather than std::ptr::addr_eq since the latter
// only compares their addresses.
#[allow(ambiguous_wide_pointer_comparisons)]
fn eq(&self, other: &Self) -> bool {
triomphe::Arc::ptr_eq(&self.0, &other.0)
}
}
impl Eq for SharedReference {}
impl PartialOrd for SharedReference {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl Ord for SharedReference {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
Ord::cmp(
&(&*self.0 as *const (dyn Any + Send + Sync)).cast::<()>(),
&(&*other.0 as *const (dyn Any + Send + Sync)).cast::<()>(),
)
}
}
impl Debug for SharedReference {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("SharedReference").field(&self.0).finish()
}
}
impl Serialize for TypedSharedReference {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let TypedSharedReference {
type_id: ty,
reference: SharedReference(arc),
} = self;
let value_type = registry::get_value_type(*ty);
if let Some(serializable) = value_type.any_as_serializable(arc) {
let mut t = serializer.serialize_tuple(2)?;
t.serialize_element(registry::get_value_type_global_name(*ty))?;
t.serialize_element(serializable)?;
t.end()
} else {
Err(serde::ser::Error::custom(format!(
"{:?} is not serializable",
registry::get_value_type_global_name(*ty)
)))
}
}
}
impl Display for SharedReference {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "untyped value")
}
}
impl Display for TypedSharedReference {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"value of type {}",
registry::get_value_type(self.type_id).name
)
}
}
impl<'de> Deserialize<'de> for TypedSharedReference {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
struct Visitor;
impl<'de> serde::de::Visitor<'de> for Visitor {
type Value = TypedSharedReference;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
formatter.write_str("a serializable shared reference")
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: serde::de::SeqAccess<'de>,
{
if let Some(global_name) = seq.next_element()? {
if let Some(ty) = registry::get_value_type_id_by_global_name(global_name) {
if let Some(seed) = registry::get_value_type(ty).get_any_deserialize_seed()
{
if let Some(value) = seq.next_element_seed(seed)? {
let arc = triomphe::Arc::<dyn Any + Send + Sync>::from(value);
Ok(TypedSharedReference {
type_id: ty,
reference: SharedReference(arc),
})
} else {
Err(serde::de::Error::invalid_length(
1,
&"tuple with type and value",
))
}
} else {
Err(serde::de::Error::custom(format!(
"{ty} is not deserializable"
)))
}
} else {
Err(serde::de::Error::unknown_variant(global_name, &[]))
}
} else {
Err(serde::de::Error::invalid_length(
0,
&"tuple with type and value",
))
}
}
}
deserializer.deserialize_tuple(2, Visitor)
}
}
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