rpc_ts/lib/examples/context/index.js

Remote Procedure Calls in TypeScript made simple

"use strict";
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 express = require("express");
const grpc_web_node_http_transport_1 = require("@improbable-eng/grpc-web-node-http-transport");
const service_1 = require("./service");
const handler_1 = require("./handler");
const auth_context_1 = require("./auth_context");
const http = require("http");
const server_1 = require("../../protocol/server");
const client_1 = require("../../protocol/client");
main().catch(
/* istanbul ignore next */
err => {
    console.error(err);
    process.exit(1);
});
async function main() {
    // We launch an Express server, register the RPC routes using the
    // `http_json` protocol, initialize an `grpc_web` client connected to this server
    // and perform some remote procedure calls.
    //
    // The context comes from a mock "authentication" connector.
    const server = setupServer();
    try {
        await clientInteraction(`http://127.0.0.1:${server.address().port}/api`);
    }
    finally {
        server.close();
    }
}
function setupServer() {
    const app = express();
    app.use('/api', server_1.ModuleRpcProtocolServer.registerRpcRoutes(service_1.bankingServiceDefinition, handler_1.getBankingHandler(), {
        serverContextConnector: new auth_context_1.AuthServerContextConnector('u1'),
    }));
    const server = http.createServer(app).listen();
    const port = server.address().port;
    app.set('port', port);
    return server;
}
async function clientInteraction(remoteAddress) {
    const client = client_1.ModuleRpcProtocolClient.getRpcClient(service_1.bankingServiceDefinition, {
        remoteAddress,
        clientContextConnector: new auth_context_1.AuthClientContextConnector('u1'),
        getGrpcWebTransport: grpc_web_node_http_transport_1.NodeHttpTransport(),
    });
    const balanceResponseBefore = await client.getBalance({});
    console.log('Balance is', balanceResponseBefore.value);
    console.log('Transfering...');
    await client.transfer({
        toUserId: 'u2',
        amount: balanceResponseBefore.value / 2,
    });
    const balanceResponseAfter = await client.getBalance({});
    console.log('Now balance is', balanceResponseAfter.value);
    // If the user is not expected, an unauthenticated error is thrown
    {
        const unauthenticatedClient = client_1.ModuleRpcProtocolClient.getRpcClient(service_1.bankingServiceDefinition, {
            remoteAddress,
            clientContextConnector: new auth_context_1.AuthClientContextConnector('u2'),
            getGrpcWebTransport: grpc_web_node_http_transport_1.NodeHttpTransport(),
        });
        try {
            await unauthenticatedClient.getBalance({});
        }
        catch (err) {
            console.log('Expected error', err);
        }
    }
}
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