simplify fetch of operation type

plugin/dapp/cross2eth/ebrelayer/relayer/chain33/chain33.go

@@ -370,10 +370,9 @@ func (chain33Relayer *Relayer4Chain33) relayLockBurnToChain33(claim *ebTypes.Eth
 	}
 
 	var tokenAddr string
-	operationType := ""
+	operationType := events.ClaimType(claim.ClaimType).String()
 	if int32(events.ClaimTypeBurn) == claim.ClaimType {
 		//burn 分支
-		operationType = "Burn"
 		if ebTypes.SYMBOL_BTY == claim.Symbol {
 			tokenAddr = ebTypes.BTYAddrChain33
 		} else {
@@ -385,7 +384,6 @@ func (chain33Relayer *Relayer4Chain33) relayLockBurnToChain33(claim *ebTypes.Eth
 		}
 	} else {
 		//lock 分支
-		operationType = "Lock"
 		var exist bool
 		tokenAddr, exist = chain33Relayer.symbol2Addr[claim.Symbol]
 		if !exist {

plugin/dapp/cross2eth/ebrelayer/relayer/ethereum/ethereum.go

@@ -473,9 +473,8 @@ func (ethRelayer *Relayer4Ethereum) handleChain33Msg(chain33Msg *events.Chain33M
 	prophecyClaim := ethtxs.Chain33MsgToProphecyClaim(*chain33Msg)
 	var tokenAddr common.Address
 	exist := false
-	operationType := ""
+	operationType := chain33Msg.ClaimType.String()
 	if chain33Msg.ClaimType == events.ClaimTypeLock {
-		operationType = "lock"
 		tokenAddr, exist = ethRelayer.symbol2Addr[prophecyClaim.Symbol]
 		if !exist {
 			relayerLog.Info("handleChain33Msg", "Query address from ethereum for symbol", prophecyClaim.Symbol)
@@ -497,7 +496,6 @@ func (ethRelayer *Relayer4Ethereum) handleChain33Msg(chain33Msg *events.Chain33M
 			tokenAddr = common.HexToAddress(addr)
 		}
 	} else {
-		operationType = "burn"
 		tokenAddr, exist = ethRelayer.symbol2LockAddr[prophecyClaim.Symbol]
 		if !exist {
 			//因为是burn操作，必须从允许lock的token地址中进行查询

plugin/dapp/cross2eth/ebrelayer/relayer/events/events.go

@@ -10,8 +10,9 @@ type Event int
 var eventsLog = log.New("module", "cross2eth_relayer")
 
 const (
-	ClaimTypeBurn = ClaimType(1)
-	ClaimTypeLock = ClaimType(2)
+	ClaimTypeUnknown = ClaimType(0)
+	ClaimTypeBurn    = ClaimType(1)
+	ClaimTypeLock    = ClaimType(2)
 )
 
 const (