fix: detect and ignore BlockPreCommit messages (#92)

Author: rafaelcr

src/event-stream/msg-parsing.ts

@@ -102,14 +102,20 @@ export interface StateMachineUpdate extends ChunkMetadata {
   // local_supported_signer_protocol_version: u64,
 }
 
+// https://github.com/stacks-network/stacks-core/blob/develop/libsigner/src/v0/messages.rs#L191
+export interface BlockPreCommitChunkType extends ChunkMetadata {
+  messageType: 'BlockPreCommit';
+}
+
 export type ParsedStackerDbChunk =
   | BlockProposalChunkType
   | BlockResponseChunkType
   | BlockPushedChunkType
   | MockProposalChunkType
   | MockSignatureChunkType
   | MockBlockChunkType
-  | StateMachineUpdate;
+  | StateMachineUpdate
+  | BlockPreCommitChunkType;
 
 export function parseStackerDbChunk(chunk: StackerDbChunk): ParsedStackerDbChunk[] {
   return chunk.modified_slots.flatMap(msg => {
@@ -144,6 +150,7 @@ enum SignerMessageTypePrefix {
   MockSignature = 4,
   MockBlock = 5,
   StateMachineUpdate = 6,
+  BlockPreCommit = 7,
 }
 
 // https://github.com/stacks-network/stacks-core/blob/cd702e7dfba71456e4983cf530d5b174e34507dc/libsigner/src/v0/messages.rs#L206
@@ -186,6 +193,10 @@ function parseSignerMessage(msg: Buffer) {
       return {
         messageType: 'StateMachineUpdate',
       } as const;
+    case SignerMessageTypePrefix.BlockPreCommit:
+      return {
+        messageType: 'BlockPreCommit',
+      } as const;
     default:
       throw new Error(`Unknown message type prefix: ${messageType}`);
   }

src/pg/ingestion/pg-write-store.ts

@@ -106,6 +106,10 @@ export class PgWriteStore extends BasePgStoreModule {
         // ignore
         break;
       }
+      case 'BlockPreCommit': {
+        // ignore
+        break;
+      }
       default: {
         this.logger.error(chunk, `Unknown StackerDB event type`);
         break;