rpc_ts
Version:
Remote Procedure Calls in TypeScript made simple
66 lines • 2.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
/**
* @license
* Copyright (c) Aiden.ai
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
const common_1 = require("../../common");
const server_1 = require("../../server");
/**
* Return a handler where the methods of the BankingService are actually implemented.
*
* We wrap it in a function to allow for closures, so that you can have variables scoped
* to the lifetime of the server (such as the mock store `users` in this instance).
*/
exports.getBankingHandler = () => {
const users = {
u1: {
balance: 1000,
},
u2: {
balance: 2000,
},
};
return {
async getBalance(_, { userId }) {
const user = users[userId];
/* istanbul ignore if */
if (!user) {
// It is possible to throw a `ModuleRpcServer.ServerRpcError` to give more
// info to the client concerning why the request fail. If any other kind
// of error is thrown, it is interpreted as an internal error.
throw new server_1.ModuleRpcServer.ServerRpcError(common_1.ModuleRpcCommon.RpcErrorType.notFound, `user ${userId} not found`);
}
return { value: user.balance };
},
async transfer(request, { userId }) {
const fromUser = users[userId];
/* istanbul ignore if */
if (!fromUser) {
// The third parameter of ModuleRpcServer.ServerRpcError is an optional
// message sent to the client along with the error type, to give more context.
// This is potentially unsafe, as this kind of information can be exploited
// by malicious clients, so by default nothing is sent.
throw new server_1.ModuleRpcServer.ServerRpcError(
// This is an internal error because should be prevented by proper authentication
common_1.ModuleRpcCommon.RpcErrorType.internal, `'from' user not found`);
}
const toUser = users[request.toUserId];
/* istanbul ignore if */
if (!toUser) {
throw new server_1.ModuleRpcServer.ServerRpcError(common_1.ModuleRpcCommon.RpcErrorType.notFound, undefined, `'to' user not found`);
}
/* istanbul ignore if */
if (fromUser.balance < request.amount) {
throw new server_1.ModuleRpcServer.ServerRpcError(common_1.ModuleRpcCommon.RpcErrorType.failedPrecondition, undefined, `'from' user has insufficient funds`);
}
fromUser.balance -= request.amount;
toUser.balance += request.amount;
return {};
},
};
};
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