LazyStack

Using Client Projects

LazyStack makes it painless to configure and call your application stack from a client application. Consider the following simple console application:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Reflection;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;

using LazyStackAuth;
using PetStoreClientSDK;
using PetStoreSchema.Models;

namespace PetStoreConsoleApp
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // Read embedded resources
            using var awsSettingsStream = 
                typeof(IAuthProcess).Assembly.GetManifestResourceStream("LazyStackAuth.AuthMessages.json");

            using var methodMapStream = 
                typeof(PetStore).Assembly.GetManifestResourceStream("PetStoreClientSDK.MethodMap.json");

            using var authMessagesStream = 
                typeof(Program).Assembly.GetManifestResourceStream("PetStoreConsoleApp.Dev_AwsSettings.json");

            // Build Configuration
            IConfiguration appConfig = new ConfigurationBuilder()
                .AddJsonStream(awsSettingsStream)
                .AddJsonStream(methodMapStream)
                .AddJsonStream(authMessagesStream)
                .Build();

            // Initialize IAuthProvider interface for AWS Cognito
            var authProvider = new AuthProviderCognito(appConfig); 
            // Initialize IAuthProcess interface to use IAuthProvider
            var authProcess = new AuthProcess(appConfig, authProvider); 

            // Initialize LzHttpClient to use IAuthProcess. It also 
            // reads appConfig sections AwsSettings and MethodMap.
            var lzHttpClient = new LzHttpClient(appConfig, authProvider); 
            var petStore = new PetStore(lzHttpClient); 

            // Login and perform a call against the AWS Stack
            try
            {
                // Sign in with existing user against Cognito
                var result = await authProcess.StartSignInAsync();
                authProcess.Login = Console.ReadLine();
                result = await authProcess.VerifyLoginAsync(); 
                authProcess.Password = Console.ReadLine();
                result = await authProcess.VerifyPasswordAsync(); 

                // Call ApiGateway and output results to console
                var pets = await petStore.FindPetsByStatusAsync(new List { PetStatus.Available });

                foreach (var pet in pets)
                    Console.WriteLine(JsonConvert.SerializeObject(pet));

                if (pets.Count == 0)
                    Console.WriteLine("No Pets Found");
            }
            catch (Exception e)
            {
                Console.WriteLine($"Error: {e.Message}");
                return;
            }

            Console.ReadKey();
        }
    }
}

In this simple example we have omitted error handling so we can focus on the key steps involved in using the client libraries and settings file. For a more robust example of a console app using LazyStack see the Tutorial Console App

The tutorial example includes a full implementation of the authentication process and using the local WebApi in addition to using the ApiGateway.