Further work on transaction signing

processor/signers/src/db.rs

@@ -0,0 +1,27 @@
+use serai_validator_sets_primitives::Session;
+
+use serai_db::{Get, DbTxn, create_db, db_channel};
+
+use messages::sign::{ProcessorMessage, CoordinatorMessage};
+
+db_channel! {
+  SignersGlobal {
+    // CompletedEventualities needs to be handled by each signer, meaning we need to turn its
+    // effective spsc into a spmc. We do this by duplicating its message for all keys we're
+    // signing for.
+    // TODO: Populate from CompletedEventualities
+    CompletedEventualitiesForEachKey: (session: Session) -> [u8; 32],
+
+    CoordinatorToTransactionSignerMessages: (session: Session) -> CoordinatorMessage,
+    TransactionSignerToCoordinatorMessages: (session: Session) -> ProcessorMessage,
+
+    CoordinatorToBatchSignerMessages: (session: Session) -> CoordinatorMessage,
+    BatchSignerToCoordinatorMessages: (session: Session) -> ProcessorMessage,
+
+    CoordinatorToSlashReportSignerMessages: (session: Session) -> CoordinatorMessage,
+    SlashReportSignerToCoordinatorMessages: (session: Session) -> ProcessorMessage,
+
+    CoordinatorToCosignerMessages: (session: Session) -> CoordinatorMessage,
+    CosignerToCoordinatorMessages: (session: Session) -> ProcessorMessage,
+  }
+}