Problem: clear logs if tx failed in post processing hooks

CHANGELOG.md

@@ -41,6 +41,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### State Machine Breaking
 
 * (evm) [tharsis#1124](https://github.com/tharsis/ethermint/pull/1124) Reject non-replay-protected tx in ante handler to prevent replay attack
+* (evm) [tharsis#1128](https://github.com/tharsis/ethermint/pull/1128) Clear tx logs if tx failed in post processing hooks
 
 ### Bug Fixes
 

x/evm/handler_test.go

@@ -599,6 +599,7 @@ func (suite *EvmTestSuite) TestERC20TransferReverted() {
 
 			suite.Require().True(res.Failed())
 			suite.Require().Equal(tc.expErr, res.VmError)
+			suite.Require().Empty(res.Logs)
 
 			after := k.GetBalance(suite.ctx, suite.from)
 

x/evm/keeper/state_transition.go

@@ -268,6 +268,11 @@ func (k *Keeper) ApplyTransaction(ctx sdk.Context, tx *ethtypes.Transaction) (*t
 			// If hooks return error, revert the whole tx.
 			res.VmError = types.ErrPostTxProcessing.Error()
 			k.Logger(ctx).Error("tx post processing failed", "error", err)
+
+			// If the tx failed in post processing hooks, we should clear the logs
+			if res.Failed() {
+				res.Logs = nil
+			}
 		} else if commit != nil {
 			// PostTxProcessing is successful, commit the tmpCtx
 			commit()