private void SaveEntries(HttpContext context, RequestEntryCollection collection)
{
string json = JsonConvert.SerializeObject(collection);
byte[] serializedResult = System.Text.Encoding.UTF8.GetBytes(json);
context.Session.Set("RequestEntries", serializedResult);
}
private RequestEntryCollection GetOrCreateEntries(HttpContext context)
{
RequestEntryCollection collection = null;
byte[] requestEntriesBytes = context.Session.Get("RequestEntries");
if (requestEntriesBytes != null && requestEntriesBytes.Length > 0)
{
string json = System.Text.Encoding.UTF8.GetString(requestEntriesBytes);
return(JsonConvert.DeserializeObject <RequestEntryCollection>(json));
}
if (collection == null)
{
collection = new RequestEntryCollection();
}
return(collection);
}
public void Configure(IApplicationBuilder app,
IHostingEnvironment env,
ILoggerFactory loggerFactory)
{
loggerFactory.MinimumLevel = LogLevel.Debug;
loggerFactory.AddConsole(LogLevel.Debug);
app.UseIISPlatformHandler();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
// don't count favicon requests
app.Map("/favicon.ico", ignore => { });
// example middleware that does not reference session at all and is configured before app.UseSession()
app.Map("/untracked", subApp =>
{
subApp.Run(async context =>
{
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync("Requested at: " + DateTime.Now.ToLongTimeString() + "<br>");
await context.Response.WriteAsync("This part of the application isn't referencing Session...<br><a href=\"/\">Return</a>");
await context.Response.WriteAsync("</body></html>");
});
});
app.UseSession();
// establish session
app.Map("/session", subApp =>
{
subApp.Run(async context =>
{
// uncomment the following line and delete session coookie to generate an error due to session access after response has begun
// await context.Response.WriteAsync("some content");
RequestEntryCollection collection = GetOrCreateEntries(context);
collection.RecordRequest(context.Request.PathBase + context.Request.Path);
SaveEntries(context, collection);
if (context.Session.GetString("StartTime") == null)
{
context.Session.SetString("StartTime", DateTime.Now.ToLongTimeString());
}
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync($"Counting: You have made {collection.TotalCount()} requests to this application.<br><a href=\"/\">Return</a>");
await context.Response.WriteAsync("</body></html>");
});
});
// main catchall middleware
app.Run(async context =>
{
RequestEntryCollection collection = GetOrCreateEntries(context);
if (collection.TotalCount() == 0)
{
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync("Your session has not been established.<br>");
await context.Response.WriteAsync(DateTime.Now.ToLongTimeString() + "<br>");
await context.Response.WriteAsync("<a href=\"/session\">Establish session</a>.<br>");
}
else
{
collection.RecordRequest(context.Request.PathBase + context.Request.Path);
SaveEntries(context, collection);
// Note: it's best to consistently perform all session access before writing anything to response
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync("Session Established At: " + context.Session.GetString("StartTime") + "<br>");
foreach (var entry in collection.Entries)
{
await context.Response.WriteAsync("Request: " + entry.Path + " was requested " + entry.Count + " times.<br />");
}
await context.Response.WriteAsync("Your session was located, you've visited the site this many times: " + collection.TotalCount() + "<br />");
}
await context.Response.WriteAsync("<a href=\"/untracked\">Visit untracked part of application</a>.<br>");
await context.Response.WriteAsync("</body></html>");
});
}
