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Startup.cs
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Startup.cs
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/*
* Copyright (c) 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System.Threading.Tasks;
namespace Metadata
{
public class Startup
{
// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.Run(async (context) =>
{
string myGoogleIpAddress = await GetMyGoogleCloudIpAddressAsync();
string text;
if (null == myGoogleIpAddress) {
// Must not be running on App Engine.
text = @"<html><head><title>Metadata Error</title></head>
<body>I am not running in the Google Cloud.
</body></html>";
} else {
text = string.Format(@"<html><head><title>Metadata Succeeded</title></head>
<body>My public IP address is {0}</body></html>", myGoogleIpAddress);
}
context.Response.ContentType = "text/html";
await context.Response.WriteAsync(text);
});
}
// [START get_my_ip]
/// <summary>
/// Query the metadata server to find my ip address.
/// </summary>
/// <returns>My ip address, or null if not running on Google Cloud.</returns>
async Task<string> GetMyGoogleCloudIpAddressAsync()
{
var metadataClient = Google.Cloud.Metadata.V1.MetadataClient.Create();
try
{
var result = await metadataClient.GetMetadataAsync(
"instance/network-interfaces/0/access-configs/0/external-ip");
return result.Content.ToString();
}
catch (System.Net.Http.HttpRequestException)
{
// Must not be running on App Engine.
}
return null;
}
// [END get_my_ip]
}
}