protected void ContextBeginRequest(object sender, EventArgs e)
{
HttpContext httpContext = _context.Context;
//read current
var requestParams = new RequestParams
{
RequestUri = httpContext.Request.Url,
UserAgent = httpContext.Request.UserAgent
};
if (Utility.IsRequestShouldBePrerendered(requestParams, _config))
{
var rendererConfig = new PrerenderServiceConfiguration(_config);
var renderer = new SnapshotRenderer(rendererConfig);
string snapshotUrl = Utility.GetSnapshotUrl(httpContext.Request.Url);
//render page html
PrerenderResult response;
try
{
response = renderer.RenderPage(snapshotUrl).Result;
}
catch (AggregateException ex)
{
string messages = "";
for (int i = 0; i < ex.InnerExceptions.Count; i++)
{
messages += ex.InnerExceptions[i].Message + Environment.NewLine;
}
httpContext.Response.Write(
string.Format(
"Failed to prerender request '{0}'. One or more exeptions has occured: '{1}'. Stack trace: '{2}'",
snapshotUrl, messages, ex.StackTrace));
httpContext.Response.StatusCode = 500;
httpContext.Response.Flush();
_context.CompleteRequest();
return;
}
httpContext.Response.Write(response.Content);
httpContext.Response.ContentType = "text/html";
httpContext.Response.StatusCode = (int)response.StatusCode;
httpContext.Response.Flush();
_context.CompleteRequest();
}
}
public override async Task Invoke(IOwinContext context)
{
PrerenderConfig config = PrerenderConfig.GetCurrent();
var requestParams = new RequestParams
{
RequestUri = context.Request.Uri,
UserAgent = context.Request.Headers["user-agent"]
};
if (Utility.IsRequestShouldBePrerendered(requestParams, config))
{
var rendererConfig = new PrerenderServiceConfiguration(config);
var renderer = new SnapshotRenderer(rendererConfig);
string snapshotUrl = Utility.GetSnapshotUrl(context.Request.Uri);
//render page html
PrerenderResult response;
try
{
response = await renderer.RenderPage(snapshotUrl);
}
catch (WebException e)
{
context.Response.Write(
string.Format("Failed to prerender request '{0}'. Error message: '{1}'. Stack trace: '{2}'",
snapshotUrl, e.Message, e.StackTrace));
context.Response.StatusCode = 500;
return;
}
await context.Response.WriteAsync(response.Content);
context.Response.ContentType = "text/html";
context.Response.StatusCode = (int)response.StatusCode;
context.Set("HTML_SNAPSHOT_MIDDLEWARE", true);
}
else
{
await Next.Invoke(context);
}
}
public void Init()
{
_renderer = new SnapshotRenderer(new TestPrerendererConfiguration());
}
