From e4eb56a4a9f4f401d44cd11fd44f72f12c62b382 Mon Sep 17 00:00:00 2001
From: Sina Mahmoodi <itz.s1na@gmail.com>
Date: Tue, 24 Oct 2023 18:14:04 +0200
Subject: [PATCH] add error code for blocks length check

---
 internal/ethapi/api.go    | 6 ++----
 internal/ethapi/errors.go | 5 +++++
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 9238fd0086..d2c5b983a5 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1230,11 +1230,9 @@ func (s *BlockChainAPI) Call(ctx context.Context, args TransactionArgs, blockNrO
 // useful to execute and retrieve values.
 func (s *BlockChainAPI) MulticallV1(ctx context.Context, opts multicallOpts, blockNrOrHash *rpc.BlockNumberOrHash) ([]blockResult, error) {
 	if len(opts.BlockStateCalls) == 0 {
-		// TODO return error code.
-		return nil, errors.New("invalid params")
+		return nil, &invalidParamsError{message: "empty input"}
 	} else if len(opts.BlockStateCalls) > maxMulticallBlocks {
-		// TODO return error code.
-		return nil, errors.New("invalid params")
+		return nil, &invalidParamsError{message: "too many blocks"}
 	}
 	if blockNrOrHash == nil {
 		n := rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber)
diff --git a/internal/ethapi/errors.go b/internal/ethapi/errors.go
index 6ea92823a2..fae01418d2 100644
--- a/internal/ethapi/errors.go
+++ b/internal/ethapi/errors.go
@@ -68,3 +68,8 @@ func callErrorFromError(err error) *callError {
 		Code:    errCodeInternalError,
 	}
 }
+
+type invalidParamsError struct{ message string }
+
+func (e *invalidParamsError) Error() string  { return e.message }
+func (e *invalidParamsError) ErrorCode() int { return errCodeInvalidParams }