chore: fix getCode

Signed-off-by: nikolay <n.atanasow94@gmail.com>

Author: natanasow

packages/relay/src/lib/services/ethService/contractService/ContractService.ts

@@ -210,7 +210,7 @@ export class ContractService implements IContractService {
     address: string,
     blockNumber: string | null,
     requestDetails: RequestDetails,
-  ): Promise<string | null> {
+  ): Promise<string> {
     const requestIdPrefix = requestDetails.formattedRequestId;
     if (!this.common.isBlockParamValid(blockNumber)) {
       throw predefined.UNKNOWN_BLOCK(
@@ -250,7 +250,7 @@ export class ContractService implements IContractService {
         } else if (result.type === constants.TYPE_CONTRACT) {
           if (result.entity.runtime_bytecode !== constants.EMPTY_HEX) {
 
-            // Might be removed by another PR related to the getCode improvements
+            // Might be removed by another PR related to the getCode improvements - https://github.com/hiero-ledger/hiero-json-rpc-relay/pull/3698
             //
             // const prohibitedOpcodes = ['CALLCODE', 'DELEGATECALL', 'SELFDESTRUCT', 'SUICIDE'];
             // const opcodes = disassemble(result?.entity.runtime_bytecode);

packages/relay/src/lib/services/ethService/contractService/IContractService.ts

@@ -22,7 +22,7 @@ export interface IContractService {
   /**
    * Returns the compiled smart contract code at a given address.
    */
-  getCode: (address: string, blockNumber: string | null, requestDetails: RequestDetails) => Promise<string | null>;
+  getCode: (address: string, blockNumber: string | null, requestDetails: RequestDetails) => Promise<string>;
 
   /**
    * Returns an array of all logs matching the filter criteria.