Add tx idempotency key to EVM Service SubmitTransaction reply (#1527)

Author: ilija42

pkg/chains/evm/evm.pb.go

@@ -322,6 +322,7 @@ message SubmitTransactionRequest {
 message SubmitTransactionReply {
   bytes txHash = 1;
   TxStatus txStatus = 2;
+  string tx_idempotency_key = 3; // idempotency key generated for this transaction
 }
 
 // TransactionStatus is an enum for the status of a transaction.

pkg/chains/evm/evm.proto

@@ -56,8 +56,9 @@ func (e *EVMClient) SubmitTransaction(ctx context.Context, txRequest evmtypes.Su
 	}
 
 	return &evmtypes.TransactionResult{
-		TxStatus: evmpb.ConvertTxStatusFromProto(reply.TxStatus),
-		TxHash:   evmtypes.Hash(reply.TxHash),
+		TxStatus:         evmpb.ConvertTxStatusFromProto(reply.TxStatus),
+		TxHash:           evmtypes.Hash(reply.TxHash),
+		TxIdempotencyKey: reply.TxIdempotencyKey,
 	}, nil
 }
 
@@ -514,8 +515,9 @@ func (e *evmServer) SubmitTransaction(ctx context.Context, request *evmpb.Submit
 		return nil, err
 	}
 	return &evmpb.SubmitTransactionReply{
-		TxHash:   txResult.TxHash[:],
-		TxStatus: evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxHash:           txResult.TxHash[:],
+		TxStatus:         evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxIdempotencyKey: txResult.TxIdempotencyKey,
 	}, nil
 }
 

pkg/loop/internal/relayer/evm.go

@@ -411,8 +411,9 @@ func (s *Server) SubmitTransaction(ctx context.Context, request *evmpb.SubmitTra
 	}
 
 	return &evmpb.SubmitTransactionReply{
-		TxHash:   txResult.TxHash[:],
-		TxStatus: evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxHash:           txResult.TxHash[:],
+		TxStatus:         evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxIdempotencyKey: txResult.TxIdempotencyKey,
 	}, nil
 }
 

pkg/loop/internal/relayerset/evm.go

@@ -147,8 +147,9 @@ func (e *TxError) Error() string {
 
 // PLEX-1524 - Refactor this to return the Tx Hash in a Transaction type and a second return value for the TxStatus. We may even be able to return the whole transaction object instead of just the hash.
 type TransactionResult struct {
-	TxStatus TransactionStatus
-	TxHash   Hash
+	TxStatus         TransactionStatus
+	TxHash           Hash
+	TxIdempotencyKey string // Idempotency key used for tracking purposes of transactions.
 }
 
 type GasConfig struct {