Outline of the transaction-chaining scheduler

processor/scheduler/utxo/transaction-chaining/src/db.rs

@@ -0,0 +1,49 @@
+use core::marker::PhantomData;
+
+use group::GroupEncoding;
+
+use serai_primitives::Coin;
+
+use serai_db::{Get, DbTxn, create_db};
+
+use primitives::ReceivedOutput;
+use scanner::{ScannerFeed, KeyFor, OutputFor};
+
+create_db! {
+  TransactionChainingScheduler {
+    SerializedOutputs: (key: &[u8], coin: Coin) -> Vec<u8>,
+  }
+}
+
+pub(crate) struct Db<S: ScannerFeed>(PhantomData<S>);
+impl<S: ScannerFeed> Db<S> {
+  pub(crate) fn outputs(
+    getter: &impl Get,
+    key: KeyFor<S>,
+    coin: Coin,
+  ) -> Option<Vec<OutputFor<S>>> {
+    let buf = SerializedOutputs::get(getter, key.to_bytes().as_ref(), coin)?;
+    let mut buf = buf.as_slice();
+
+    let mut res = Vec::with_capacity(buf.len() / 128);
+    while !buf.is_empty() {
+      res.push(OutputFor::<S>::read(&mut buf).unwrap());
+    }
+    Some(res)
+  }
+  pub(crate) fn set_outputs(
+    txn: &mut impl DbTxn,
+    key: KeyFor<S>,
+    coin: Coin,
+    outputs: &[OutputFor<S>],
+  ) {
+    let mut buf = Vec::with_capacity(outputs.len() * 128);
+    for output in outputs {
+      output.write(&mut buf).unwrap();
+    }
+    SerializedOutputs::set(txn, key.to_bytes().as_ref(), coin, &buf);
+  }
+  pub(crate) fn del_outputs(txn: &mut impl DbTxn, key: KeyFor<S>, coin: Coin) {
+    SerializedOutputs::del(txn, key.to_bytes().as_ref(), coin);
+  }
+}