public async Task Invoke(HttpContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.Response.StatusCode == 304 || context.Request.Headers.ContainsKey("X-Esi"))
{
await _next(context);
return;
}
var executionContext = new EsiExecutionContext(
context.Request.Headers.ToDictionary(), context.Request.GetVariablesFromContext());
var pageUri = context.Request.GetPageUri();
var(found, cachedResponse) = await _cache.TryGet <FragmentPageResponse>(pageUri, executionContext);
IEsiFragment fragment;
if (found)
{
context.Response.CopyHeaders(cachedResponse.Headers);
fragment = cachedResponse.Fragment;
}
else
{
var acceptEncoding = context.Request.Headers[HeaderNames.AcceptEncoding];
context.Request.Headers[HeaderNames.AcceptEncoding] = StringValues.Empty;
var body = await _next.TryIntercept(context);
context.Request.Headers[HeaderNames.AcceptEncoding] = acceptEncoding;
if (body == null)
{
return;
}
fragment = _parser.Parse(body);
await StoreFragmentInCache(context, pageUri, executionContext, fragment);
}
var content = await _executor.Execute(fragment, executionContext);
await context.Response.WriteAllAsync(content);
}
