tc_state/
view.rs

1use std::collections::HashMap;
2
3use async_trait::async_trait;
4use destream::{en, EncodeMap};
5use futures::stream::{self, StreamExt, TryStreamExt};
6use futures::TryFutureExt;
7
8use tc_error::*;
9use tc_scalar::{OpDef, Scalar};
10use tc_transact::{Gateway, IntoView, Transaction};
11use tcgeneric::{Id, NativeClass};
12
13use super::object::ObjectView;
14use super::{CacheBlock, StateType};
15
16use super::State;
17
18/// A view of a [`State`] within a single transaction, used for serialization.
19pub enum StateView<'en> {
20    #[cfg(feature = "chain")]
21    Chain(tc_chain::ChainView<'en, tc_collection::CollectionView<'en>>),
22    Closure((HashMap<Id, StateView<'en>>, OpDef)),
23    #[cfg(feature = "collection")]
24    Collection(tc_collection::CollectionView<'en>),
25    Map(HashMap<Id, StateView<'en>>),
26    Object(Box<ObjectView<'en>>),
27    Scalar(Scalar),
28    Tuple(Vec<StateView<'en>>),
29}
30
31#[async_trait]
32impl<'en, Txn> IntoView<'en, CacheBlock> for State<Txn>
33where
34    Txn: Transaction<CacheBlock> + Gateway<State<Txn>>,
35{
36    type Txn = Txn;
37    type View = StateView<'en>;
38
39    async fn into_view(self, txn: Self::Txn) -> TCResult<Self::View> {
40        match self {
41            #[cfg(feature = "chain")]
42            Self::Chain(chain) => chain.into_view(txn).map_ok(StateView::Chain).await,
43            Self::Closure(closure) => closure.into_view(txn).map_ok(StateView::Closure).await,
44            #[cfg(feature = "collection")]
45            Self::Collection(collection) => {
46                collection
47                    .into_view(txn)
48                    .map_ok(StateView::Collection)
49                    .await
50            }
51            Self::Map(map) => {
52                let map_view = stream::iter(map.into_iter())
53                    .map(|(key, state)| state.into_view(txn.clone()).map_ok(|view| (key, view)))
54                    .buffer_unordered(num_cpus::get())
55                    .try_collect::<HashMap<Id, StateView>>()
56                    .await?;
57
58                Ok(StateView::Map(map_view))
59            }
60            Self::Object(object) => {
61                object
62                    .into_view(txn)
63                    .map_ok(Box::new)
64                    .map_ok(StateView::Object)
65                    .await
66            }
67            Self::Scalar(scalar) => Ok(StateView::Scalar(scalar)),
68            Self::Tuple(tuple) => {
69                let tuple_view = stream::iter(tuple.into_iter())
70                    .map(|state| state.into_view(txn.clone()))
71                    .buffered(num_cpus::get())
72                    .try_collect::<Vec<StateView>>()
73                    .await?;
74
75                Ok(StateView::Tuple(tuple_view.into()))
76            }
77        }
78    }
79}
80
81impl<'en> en::IntoStream<'en> for StateView<'en> {
82    fn into_stream<E: en::Encoder<'en>>(self, encoder: E) -> Result<E::Ok, E::Error> {
83        match self {
84            #[cfg(feature = "chain")]
85            Self::Chain(chain) => chain.into_stream(encoder),
86            Self::Closure(closure) => {
87                let mut map = encoder.encode_map(Some(1))?;
88                map.encode_key(StateType::Closure.path().to_string())?;
89                map.encode_value(closure)?;
90                map.end()
91            }
92            #[cfg(feature = "collection")]
93            Self::Collection(collection) => collection.into_stream(encoder),
94            Self::Map(map) => map.into_stream(encoder),
95            Self::Object(object) => object.into_stream(encoder),
96            Self::Scalar(scalar) => scalar.into_stream(encoder),
97            Self::Tuple(tuple) => tuple.into_stream(encoder),
98        }
99    }
100}
tc_state/view.rs

tc_state/
view.rs
