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command line arguments handling

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This commit is contained in:
Simon Zeltser 2018-06-21 11:10:13 -07:00
parent 8860d8bfdd
commit 0ce195bb80
3 changed files with 53 additions and 53 deletions
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44
src/cartservice/Program.cs
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@ -1,29 +1,41 @@
using System;
using System.IO;
using cartservice.cartstore;
using CommandLine;
using Grpc.Core;
using Microsoft.Extensions.Configuration;
namespace cartservice
{
class Program
{
const string CART_SERVICE_ADDRESS = "CART_SERVICE_ADDR";
const string REDIS_ADDRESS = "REDIS_ADDR";
[Verb("start", HelpText = "Starts the server listening on provided port")]
class ServerOptions
{
[Option('h', "hostname", HelpText = "The ip on which the server is running. If not provided, CART_SERVICE_ADDR environment variable value will be used. If not defined, localhost is used")]
public string Host { get; set; }
[Option('p', "port", HelpText = "The port on for running the server", Required = true)]
public int Port { get; set; }
[Option('r', "redis", HelpText = "The ip of redis cache")]
public string Redis { get; set; }
}
static object StartServer(string host, int port)
static object StartServer(string host, int port, string redisAddress)
{
var store = new CartStore();
var store = new RedisCartStore(redisAddress);
Server server = new Server
{
Services = { Hipstershop.CartService.BindService(new CartServiceImpl(store)) },
Ports = { new ServerPort(host, port, ServerCredentials.Insecure) }
};
Console.WriteLine("Cart server is listening on port " + port);
Console.WriteLine($"Cart server is listening at {host}:{port}");
Console.WriteLine("Press any key to stop the server...");
server.Start();
@ -33,6 +45,7 @@ namespace cartservice
return null;
}
static void Main(string[] args)
{
if (args.Length == 0)
@ -45,15 +58,34 @@ namespace cartservice
{
case "start":
Parser.Default.ParseArguments<ServerOptions>(args).MapResult(
(ServerOptions options) => StartServer("localhost", options.Port),
(ServerOptions options) =>
{
string host = options.Host;
if (string.IsNullOrEmpty(host))
{
Console.WriteLine($"Reading host address from {CART_SERVICE_ADDRESS} environment variable...");
host = Environment.GetEnvironmentVariable(CART_SERVICE_ADDRESS);
if (string.IsNullOrEmpty(host))
{
Console.WriteLine("Setting the host to 127.0.0.1");
host = "127.0.0.1";
}
}
string redis = options.Redis;
if (string.IsNullOrEmpty(redis))
{
Console.WriteLine("Reading redis cache address from environment variable");
redis = Environment.GetEnvironmentVariable(REDIS_ADDRESS);
}
return StartServer(host, options.Port, redis);
},
errs => 1);
break;
default:
Console.WriteLine("Invalid command");
break;
}
Console.WriteLine("Hello World!");
}
}
}