fix: handle byron blocks mint where there is no issuer

Author: golddydev

modules/epochs_state/src/epochs_state.rs

@@ -150,9 +150,7 @@ impl EpochsState {
                     let span = info_span!("epochs_state.handle_mint", block = block_info.number);
                     span.in_scope(|| {
                         if let Some(header) = header.as_ref() {
-                            if let Some(issuer_vkey) = header.issuer_vkey() {
-                                state.handle_mint(block_info, issuer_vkey);
-                            }
+                            state.handle_mint(block_info, header.issuer_vkey());
                         }
                     });
                 }

modules/epochs_state/src/state.rs

@@ -183,14 +183,15 @@ impl State {
 
     // Handle mint
     // This will update last block time
-    pub fn handle_mint(&mut self, block_info: &BlockInfo, issuer_vkey: &[u8]) {
+    pub fn handle_mint(&mut self, block_info: &BlockInfo, issuer_vkey: Option<&[u8]>) {
         self.last_block_time = block_info.timestamp;
         self.last_block_height = block_info.number;
         self.epoch_blocks += 1;
-        let spo_id = PoolId::from(keyhash_224(issuer_vkey));
-
-        // Count one on this hash
-        *(self.blocks_minted.entry(spo_id).or_insert(0)) += 1;
+        if let Some(issuer_vkey) = issuer_vkey {
+            let spo_id = PoolId::from(keyhash_224(issuer_vkey));
+            // Count one on this hash
+            *(self.blocks_minted.entry(spo_id).or_insert(0)) += 1;
+        }
     }
 
     // Handle Block Txs
@@ -329,9 +330,9 @@ mod tests {
         let mut state = State::new(&GenesisValues::mainnet());
         let issuer = b"issuer_key";
         let mut block = make_block(100);
-        state.handle_mint(&block, issuer);
+        state.handle_mint(&block, Some(issuer));
         block.number += 1;
-        state.handle_mint(&block, issuer);
+        state.handle_mint(&block, Some(issuer));
 
         assert_eq!(state.epoch_blocks, 2);
         assert_eq!(state.blocks_minted.len(), 1);
@@ -345,11 +346,11 @@ mod tests {
     fn handle_mint_multiple_issuer_records_counts() {
         let mut state = State::new(&GenesisValues::mainnet());
         let mut block = make_block(100);
-        state.handle_mint(&block, b"issuer_1");
+        state.handle_mint(&block, Some(b"issuer_1"));
         block.number += 1;
-        state.handle_mint(&block, b"issuer_2");
+        state.handle_mint(&block, Some(b"issuer_2"));
         block.number += 1;
-        state.handle_mint(&block, b"issuer_2");
+        state.handle_mint(&block, Some(b"issuer_2"));
 
         assert_eq!(state.epoch_blocks, 3);
         assert_eq!(state.blocks_minted.len(), 2);
@@ -408,7 +409,7 @@ mod tests {
         let genesis = GenesisValues::mainnet();
         let mut state = State::new(&genesis);
         let block = make_block(1);
-        state.handle_mint(&block, b"issuer_1");
+        state.handle_mint(&block, Some(b"issuer_1"));
         state.handle_block_txs(
             &block,
             &BlockTxsMessage {
@@ -464,7 +465,7 @@ mod tests {
         )));
         let mut state = history.lock().await.get_current_state();
         let mut block = make_block(1);
-        state.handle_mint(&block, b"issuer_1");
+        state.handle_mint(&block, Some(b"issuer_1"));
         state.handle_block_txs(
             &block,
             &BlockTxsMessage {
@@ -477,7 +478,7 @@ mod tests {
 
         let mut state = history.lock().await.get_current_state();
         block.number += 1;
-        state.handle_mint(&block, b"issuer_1");
+        state.handle_mint(&block, Some(b"issuer_1"));
         state.handle_block_txs(
             &block,
             &BlockTxsMessage {
@@ -494,7 +495,7 @@ mod tests {
 
         block = make_rolled_back_block(0);
         let mut state = history.lock().await.get_rolled_back_state(block.number);
-        state.handle_mint(&block, b"issuer_2");
+        state.handle_mint(&block, Some(b"issuer_2"));
         state.handle_block_txs(
             &block,
             &BlockTxsMessage {