Snapshot term_metadata on every term close for the era > 0

Author: foriequal0

core/src/consensus/tendermint/engine.rs

@@ -24,7 +24,7 @@ use std::sync::{Arc, Weak};
 use ckey::{public_to_address, Address};
 use cnetwork::NetworkService;
 use crossbeam_channel as crossbeam;
-use cstate::{ActionHandler, TopStateView};
+use cstate::{ActionHandler, TopState, TopStateView};
 use ctypes::{BlockHash, BlockNumber, CommonParams, Header};
 use num_rational::Ratio;
 
@@ -244,6 +244,11 @@ impl ConsensusEngine for Tendermint {
         stake::move_current_to_previous_intermediate_rewards(&mut block.state_mut())?;
         stake::on_term_close(block.state_mut(), last_term_finished_block_num, &inactive_validators)?;
 
+        match term_common_params.era() {
+            0 => {}
+            1 => block.state_mut().snapshot_term_params()?,
+            _ => unimplemented!("It is not decided how we handle this"),
+        }
         Ok(())
     }
 

state/src/impls/top_level.rs

@@ -999,6 +999,12 @@ impl TopState for TopLevelState {
         metadata.increase_seq();
         Ok(())
     }
+
+    fn snapshot_term_params(&mut self) -> StateResult<()> {
+        let mut metadata = self.get_metadata_mut()?;
+        metadata.snapshot_term_params();
+        Ok(())
+    }
 }
 
 fn is_active_account(state: &dyn TopStateView, address: &Address) -> TrieResult<bool> {

state/src/traits.rs

@@ -183,6 +183,7 @@ pub trait TopState {
     fn remove_action_data(&mut self, key: &H256);
 
     fn update_params(&mut self, metadata_seq: u64, params: CommonParams) -> StateResult<()>;
+    fn snapshot_term_params(&mut self) -> StateResult<()>;
 }
 
 pub trait StateWithCache {