public override async Task Invoke(IOwinContext context)
{
PathString subPath;
context.Request.Path.StartsWithSegments(options.Path, out subPath);
if (!subPath.StartsWithSegments(new PathString("/download")))
{
await Next.Invoke(context);
return;
}
const int defaultPageSize = 100;
var pageIndex = 0;
var count = 0;
var total = await errorLog.GetTotalErrorCountAsync();
var limit = Convert.ToInt32(context.Request.Query["limit"]);
var maxDownloadCount = limit > 0 ? Math.Min(total, limit) : total;
var requestUrl = context.Request.Uri;
context.Response.ContentType = "text/csv; header=present";
context.Response.Headers.Set("Content-Disposition", "attachment; filename=errorlog.csv");
context.Response.StatusCode = 200;
using (var writer = new StreamWriter(context.Response.Body, Encoding.UTF8))
{
await writer.WriteLineAsync("Application,Host,Time,Type,Source,User,Status Code,Message,URL,JSONREF");
do
{
var pageSize = Math.Min(maxDownloadCount - count, defaultPageSize);
var errorLogEntries = await errorLog.GetErrorsAsync(pageIndex ++, pageSize);
count += errorLogEntries.Count;
foreach (var errorLogEntry in errorLogEntries)
{
var error = errorLogEntry.Error;
var time = error.Time.ToUniversalTime();
var query = $"?id={errorLogEntry.Id}";
await writer.WriteLineAsync($"{error.ApplicationName},{error.HostName},{time.ToString("yyyy-MM-dd HH:mm:ss")},{error.TypeName},{error.Source},{error.User},{error.StatusCode},{error.Message},{new Uri(requestUrl, "detail" + query)},{new Uri(requestUrl, "json" + query)}");
}
} while (count < maxDownloadCount);
}
}
private async Task <IEnumerable <ErrorLogEntry> > GetAllEntriesAsync()
{
const int defaultPageSize = 30;
const int maxPageLimit = 30;
var totalErrorCount = await errorLog.GetTotalErrorCountAsync();
var count = 0;
var list = new List <ErrorLogEntry>();
for (var pageIndex = 0; pageIndex < maxPageLimit && count < totalErrorCount; pageIndex++)
{
var entries = await errorLog.GetErrorsAsync(pageIndex, defaultPageSize);
count += entries.Count;
list.AddRange(entries);
}
return(list);
}