public /* will not be part of web service itself */ void Handler(WebServiceHandler h)
{
// I/System.Console(12961): Caused by: java.lang.NullPointerException
//I/System.Console(12961): at ConsoleByCookie.ApplicationWebService.Handler(ApplicationWebService.java:162)
//I/System.Console(12961): ... 17 more
var Accepts = h.Context.Request.Headers["Accept"];
__ConsoleToDatabaseWriter.InternalWriteLine(
new { h.Context.Request.Path, Accepts } + Environment.NewLine
);
//EventSource's response has a MIME type ("text/plain") that is not "text/event-stream". Aborting the connection.
if (h.Context.Request.Path == "/wait")
{
Thread.Sleep(5000);
h.CompleteRequest();
return;
}
if (Accepts != null)
if (Accepts.Contains("text/event-stream"))
{
//try
//{
// http://www.w3schools.com/html/html5_serversentevents.asp
// http://caniuse.com/eventsource
// http://www.w3.org/TR/eventsource/
// https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events
// http://opensource.apple.com/source/WebCore/WebCore-1640.1/page/EventSource.cpp?txt
// http://stackoverflow.com/questions/13166284/eventsources-response-has-a-mime-type-text-html-that-is-not-text-event-str
h.Context.Response.ContentType = "text/event-stream";
h.Context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
//EventSource's response has a MIME type ("text/plain") that is not "text/event-stream". Aborting the connection.
// A potentially dangerous Request.QueryString value was detected from the client (e="<client value="15.12...").
//var _e_xml = h.Context.Request.RawUrl
// .SkipUntilLastOrEmpty("?")
// .SkipUntilOrEmpty("e=")
// .TakeUntilIfAny("&");
//var _e_xml_decoded = HttpUtility.UrlDecode(_e_xml);
// No Cookies on andrid yet?
// http://en.wikipedia.org/wiki/List_of_HTTP_header_fields
var header_cookie = h.Context.Request.Headers["Cookie"];
//Implementation not found for type import :
//System.Web.HttpRequest :: System.Web.HttpCookieCollection get_Cookies()
//Did you forget to add the [Script] attribute?
//Please double check the signature!
//type: ConsoleByCookie.ApplicationWebService offset: 0x014c method:Void Handler(ScriptCoreLib.Ultra.WebService.WebServiceHandler)
//foreach (var item in collection)
//{
//}
var cookie_session = h.Context.Request.Cookies["session"];
//no session cookie? { header_cookie = session=2006041647; xfoo=foo; random=2376781287 }
#region workaround
if (cookie_session == null)
cookie_session = new HttpCookie(
"session",
header_cookie.SkipUntilLastOrEmpty("session=").TakeUntilOrEmpty(";")
);
#endregion
if (cookie_session == null)
{
//__ConsoleToDatabaseWriter.InternalWriteLine("no session cookie? " + new { header_cookie });
h.Context.Response.StatusCode = 500;
h.CompleteRequest();
return;
}
//var _e = XElement.Parse(cookie_session.Value);
var session = int.Parse(cookie_session.Value);
//var c = new __ConsoleToDatabaseWriter(session);
var data = new SystemConsoleOut();
var header_id = h.Context.Request.Headers["Last-Event-ID"];
var id = 0;
if (header_id != null)
{
//__ConsoleToDatabaseWriter.InternalWrite("Continue " + new { session, header_id }.ToString() + Environment.NewLine);
//id = int.Parse(XElement.Parse(header_id).Attribute("id").Value);
id = int.Parse(header_id);
}
else
{
data.SelectTransactionKey(session,
nextid =>
{
id = (int)nextid;
//var xml = new XElement("e",
// new XAttribute("id", id)
//);
//__ConsoleToDatabaseWriter.InternalWrite("Reset To " + new { session, id }.ToString() + Environment.NewLine);
h.Context.Response.Write("id: " + id + "\n\n");
//h.Context.Response.Write("event: SystemConsoleOut\n");
h.Context.Response.Write("data: reset to " + new { id } + " \n\n");
h.Context.Response.Flush();
}
);
}
int retry = 1000 / 30;
Action CheckForUpdates = delegate
{
Action later = delegate { };
data.SelectTransactionKey(session,
nextid =>
{
if (id == (int)nextid)
{
later = delegate
{
// no updates yet
// it is imortant to sleep
// only if we released the database.
// otherwise other threads will wait for us!
Thread.Sleep(retry);
};
return;
}
data.SelectContentUpdates(
new SystemConsoleOutQueries.SelectContentUpdates
{
id = id,
nextid = (int)nextid,
session = session
},
r =>
{
string value = r.value;
h.Context.Response.Write("event: SystemConsoleOut\n");
h.Context.Response.Write("data: " +
value.Replace("\r", "\\r").Replace("\n", "\\n") + "\n\n");
// wont work on appengine?
// https://groups.google.com/forum/?fromgroups=#!topic/google-appengine-java/LWWRMP5KU1w
// https://developers.google.com/appengine/docs/java/runtime#Responses
// limited to 32MB
// need to use channel API instead?
// https://developers.google.com/appengine/docs/python/channel/overview
h.Context.Response.Flush();
}
);
id = (int)nextid;
//var xml = new XElement("e",
// new XAttribute("id", id)
//);
//h.Context.Response.Write("id: " + xml.ToString() + "\n\n");
h.Context.Response.Write("id: " + id + "\n\n");
h.Context.Response.Flush();
}
);
later();
};
// loop forever?
var t = new Stopwatch();
t.Start();
//for (int i = 0; i < 1024; i++)
while (t.ElapsedMilliseconds < 7000)
{
// http://stackoverflow.com/questions/9743253/how-to-detect-a-disconnection-when-using-server-sent-events-on-asp-net
//if (!h.Context.Response.IsClientConnected)
//{
// __ConsoleToDatabaseWriter.InternalWrite("!IsClientConnected");
// break;
//}
//__ConsoleToDatabaseWriter.InternalWrite("CheckForUpdates " + new { Thread.CurrentThread.ManagedThreadId, session, i, id }.ToString() + Environment.NewLine);
CheckForUpdates();
}
//Thread.Sleep(5000);
#region prevent error 2, required if we did not send any other events
h.Context.Response.Write("retry: " + retry + "\n\n");
h.Context.Response.Write("data: retry later\n\n");
h.Context.Response.Flush();
#endregion
h.CompleteRequest();
//}
//catch //(Exception ex)
//{
// throw;
//}
}
__ConsoleToDatabaseWriter.InternalWrite(
new { h.Context.Request.Path, Accepts, h.Context.Response.ContentType } + " done!" + Environment.NewLine
);
}