Add value size counters for conf store precompiles (#42)

core/vm/contracts_suave.go

@@ -11,9 +11,15 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/metrics"
 	suave "github.com/ethereum/go-ethereum/suave/core"
 )
 
+var (
+	confStorePrecompileStoreMeter    = metrics.NewRegisteredMeter("suave/confstore/store", nil)
+	confStorePrecompileRetrieveMeter = metrics.NewRegisteredMeter("suave/confstore/retrieve", nil)
+)
+
 var (
 	isConfidentialAddress               = common.HexToAddress("0x42010000")
 	errIsConfidentialInvalidInputLength = errors.New("invalid input length")
@@ -128,6 +134,10 @@ func (c *confStoreStore) runImpl(backend *SuaveExecutionBackend, bidId [16]byte,
 		}
 	}
 
+	if metrics.Enabled {
+		confStorePrecompileStoreMeter.Mark(int64(len(data)))
+	}
+
 	_, err := backend.ConfidentialStoreBackend.Store(bidId, caller, key, data)
 	if err != nil {
 		return err
@@ -192,6 +202,10 @@ func (c *confStoreRetrieve) runImpl(backend *SuaveExecutionBackend, bidId [16]by
 		return []byte(err.Error()), err
 	}
 
+	if metrics.Enabled {
+		confStorePrecompileRetrieveMeter.Mark(int64(len(data)))
+	}
+
 	return data, nil
 }