Adding withdraw ETH from transfer gateway

src/contracts/transfer-gateway.ts

@@ -5,6 +5,7 @@ import { Address } from '../address'
 import {
   TransferGatewayWithdrawERC721Request,
   TransferGatewayWithdrawERC20Request,
+  TransferGatewayWithdrawETHRequest,
   TransferGatewayWithdrawalReceiptRequest,
   TransferGatewayWithdrawalReceiptResponse,
   TransferGatewayWithdrawalReceipt,
@@ -137,6 +138,14 @@ export class TransferGateway extends Contract {
     return this.callAsync<void>('WithdrawERC20', tgWithdrawERC20Req)
   }
 
+  withdrawETHAsync(amount: BN, mainNetGateway: Address): Promise<void> {
+    const tgWithdrawETHReq = new TransferGatewayWithdrawETHRequest()
+    tgWithdrawETHReq.setAmount(marshalBigUIntPB(amount))
+    tgWithdrawETHReq.setMainnetGateway(mainNetGateway.MarshalPB())
+
+    return this.callAsync<void>('WithdrawETH', tgWithdrawETHReq)
+  }
+
   async withdrawalReceiptAsync(owner: Address): Promise<IWithdrawalReceipt | null> {
     const tgWithdrawReceiptReq = new TransferGatewayWithdrawalReceiptRequest()
     tgWithdrawReceiptReq.setOwner(owner.MarshalPB())

src/proto/transfer_gateway.proto

@@ -60,6 +60,13 @@ message TransferGatewayWithdrawERC20Request {
     Address token_contract = 2;
 }
 
+message TransferGatewayWithdrawETHRequest {
+    // Amount of ETH to withdraw
+    BigUInt amount = 1;
+    // Address of Mainnet Gateway contract
+    Address mainnet_gateway = 2;
+}
+
 message TransferGatewayWithdrawalReceiptRequest {
     Address owner = 1;
 }

src/proto/transfer_gateway_pb.d.ts

@@ -180,6 +180,34 @@ export namespace TransferGatewayWithdrawERC20Request {
   }
 }
 
+export class TransferGatewayWithdrawETHRequest extends jspb.Message {
+  hasAmount(): boolean;
+  clearAmount(): void;
+  getAmount(): proto_loom_pb.BigUInt | undefined;
+  setAmount(value?: proto_loom_pb.BigUInt): void;
+
+  hasMainnetGateway(): boolean;
+  clearMainnetGateway(): void;
+  getMainnetGateway(): proto_loom_pb.Address | undefined;
+  setMainnetGateway(value?: proto_loom_pb.Address): void;
+
+  serializeBinary(): Uint8Array;
+  toObject(includeInstance?: boolean): TransferGatewayWithdrawETHRequest.AsObject;
+  static toObject(includeInstance: boolean, msg: TransferGatewayWithdrawETHRequest): TransferGatewayWithdrawETHRequest.AsObject;
+  static extensions: {[key: number]: jspb.ExtensionFieldInfo<jspb.Message>};
+  static extensionsBinary: {[key: number]: jspb.ExtensionFieldBinaryInfo<jspb.Message>};
+  static serializeBinaryToWriter(message: TransferGatewayWithdrawETHRequest, writer: jspb.BinaryWriter): void;
+  static deserializeBinary(bytes: Uint8Array): TransferGatewayWithdrawETHRequest;
+  static deserializeBinaryFromReader(message: TransferGatewayWithdrawETHRequest, reader: jspb.BinaryReader): TransferGatewayWithdrawETHRequest;
+}
+
+export namespace TransferGatewayWithdrawETHRequest {
+  export type AsObject = {
+    amount?: proto_loom_pb.BigUInt.AsObject,
+    mainnetGateway?: proto_loom_pb.Address.AsObject,
+  }
+}
+
 export class TransferGatewayWithdrawalReceiptRequest extends jspb.Message {
   hasOwner(): boolean;
   clearOwner(): void;