Hello,

I see that pas2js has support for websockets, but I cannot find if it also supports server sent events.

A couple of years ago I implemented an application with sse where I used fpWeb and plain html+javascript in the browser.

Now I need to implement a more complex application and I'd like to use pas2js, if it supports sse I can reuse the old server class, if it doesn't I'll have to reimplement it as a websocket server.

Bye

Hello, I see that pas2js has support for websockets, but I cannot find if it also supports server sent events.

A websocket is bidirectional.

  WebSocket:=TJSWebSocket.new(URL);
  ;
  WebSocket.binaryType := 'arraybuffer';
function TWebapp.OnWebSocketMessage(Event: TEventListenerEvent
  ): boolean;
var
  MsgEvent: TJSMessageEvent;
  ArrBuffer: TJSArrayBuffer;
begin
  Result:=true;
  MsgEvent:=TJSMessageEvent(Event);
  ArrBuffer:=TJSArrayBuffer(MsgEvent.Data);
  ...
end;

Mattias

If you could do it with Javascript, you are able to do it with pas2js.

I added the definition of EventSource class to the weborworker unit, so you can work in a type-safe manner.

Michael.

El 26/8/22 a les 11:25, Mattias Gaertner ha escrit:

Yes, I know, but I'm lazy ;-) and if I can reuse the server class I already implemented for sse I would be happy. Though maybe it wouldn't be too much work

WebSocket:=TJSWebSocket.new(URL); ; WebSocket.binaryType := 'arraybuffer';

Is this on the client or on the server? I couldn't find a freepascal TJSWebSocket class on duckduckgo. I could find
https://github.com/Warfley/LazWebsockets but the class is called TWebSocketServer.

Bye

client - pas2js

Do you want to use pas2js on the server side?

Mattias

El 26/8/22 a les 13:33, Mattias Gaertner ha escrit:

No, I want to use it only on the client side, hence my question about server sent events (I already have a server class for that).

Bye

El 26/8/22 a les 11:32, Michael Van Canneyt ha escrit:

I added the definition of EventSource class to the weborworker unit, so you can work in a type-safe manner.

Thank you.
In case I go the websocket route I'll have to use a different server on a different port than fpWeb, right?
In that case would the client have problems in connecting to a different port? (since nowadays browsers are more restrictive and rightly so).

Bye

No.

The HTTP implementation of FPC understands the upgrade request and will switch to websocket, so you can use the same port.

You must use trunk for this, however.

Michael.

El 26/8/22 a les 13:58, Michael Van Canneyt ha escrit:

Mmmh, in case I don't want to use trunk, will the browser impose some restriction to connect to a different port?

Bye

It can be that CORS interferes, but since it is GET only, I would think not.

In each case, you'll need trunk if you want websockets: websockets are only available in trunk.

Michael.

El 26/8/22 a les 15:11, Michael Van Canneyt ha escrit:

In each case, you'll need trunk if you want websockets: websockets are only available in trunk.

I could use https://github.com/Warfley/LazWebsockets or https://github.com/tenrok/bauglir-websocket-2

Bye

[...] In each case, you'll need trunk if you want websockets: websockets are only available in trunk.

Note that the units can be compiled with fpc 3.2.2 just fine.

Mattias

El 26/8/22 a les 17:34, Mattias Gaertner ha escrit:

I tried but I failed:

-fcl-web depends on fcl-hash which is not available in 3.2.2 -fcl-hash depends on basenenc in fcl-base
-I copied basenenc.pp to fcl-hash and could compile it -then fcl-web uses fpthreadpool.pp, copied it from trunk -then fcl-web fails to compile:

fphttpserver.pp(1068,39) Error: identifier idents no member "CanRead" fphttpserver.pp(1634) Fatal: There were 1 errors compiling module, stopping Fatal: Compilation aborted

Bye

You must also copy ssockets from fcl-net

Michael.

Copy these units to a folder

fpcustwsserver.pp
fphttpserver.pp
fpthreadpool.pp
fpwebsocketclient.pp
fpwebsocket.pp
fpwebsocketserver.pp
httpdefs.pp
httpprotocol.pp
httproute.pp
sslsockets.pp
ssockets.pp
wsupgrader.pp

Compile wsupgrader.pp

Mattias

El 26/8/22 a 17:59, Mattias Gaertner ha escrit:

Thank you!

with those files I managed to compile and test the example websocket client and server.
To compile the httpupgrader example I had to add

fpwebfile.pp
fphttp.pp
httpjson.pp

I put them all in an lpk so I can experiment further.

Bye