Start defining the coordinator

coordinator/src/substrate.rs

@@ -0,0 +1,52 @@
+use serai_client::{SeraiError, Block, Serai};
+
+async fn handle_block(serai: &Serai, block: Block) -> Result<Vec<()>, SeraiError> {
+  let hash = block.hash();
+  let mut actions = vec![];
+
+  // If a new validator set was activated, create tributary/inform processor to do a DKG
+  for new_set in serai.get_new_set_events(hash).await? {
+    todo!()
+  }
+
+  // If a key pair was confirmed, inform the processor
+  for key_gen in serai.get_key_gen_events(hash).await? {
+    todo!()
+  }
+
+  // If batch, tell processor of block acknowledged/burns
+  for new_set in serai.get_batch_events(hash).await? {
+    todo!()
+  }
+
+  Ok(actions)
+}
+
+pub(crate) async fn handle_new_blocks(
+  serai: &Serai,
+  last_substrate_block: &mut u64,
+) -> Result<(), SeraiError> {
+  // Check if there's been a new Substrate block
+  let latest = serai.get_latest_block().await?;
+  let latest_number = latest.number();
+  if latest_number == *last_substrate_block {
+    return Ok(());
+  }
+  let mut latest = Some(latest);
+
+  for b in (*last_substrate_block + 1) ..= latest_number {
+    let actions = handle_block(
+      serai,
+      if b == latest_number {
+        latest.take().unwrap()
+      } else {
+        serai.get_block_by_number(b).await?.unwrap()
+      },
+    )
+    .await?;
+    // TODO: Handle actions, update the DB
+    *last_substrate_block += 1;
+  }
+
+  Ok(())
+}