From 51f88f6be468d2232b21aff132400210871c9e22 Mon Sep 17 00:00:00 2001
From: Maksym Sobolyev <sobomax@sippysoft.com>
Date: Mon, 1 Jul 2024 13:12:14 -0700
Subject: [PATCH] Add initial revision of the WS/WSS socket server.

---
 sippy/Wss_server.py | 110 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 sippy/Wss_server.py

diff --git a/sippy/Wss_server.py b/sippy/Wss_server.py
new file mode 100644
index 000000000..86d3796bf
--- /dev/null
+++ b/sippy/Wss_server.py
@@ -0,0 +1,110 @@
+from typing import Optional, Dict, Tuple
+from threading import Thread
+from asyncio import get_event_loop, all_tasks, new_event_loop, set_event_loop, CancelledError, \
+  Queue as AsyncQueue, create_task
+from ssl import SSLContext, PROTOCOL_TLS_SERVER
+from uuid import UUID
+from websockets import WebSocketServerProtocol, ConnectionClosed, serve as ws_serve
+
+from sippy.Core.EventDispatcher import ED2
+from sippy.Network_server import Network_server, Network_server_opts
+from sippy.Time.MonoTime import MonoTime
+
+class Wss_server_opts(Network_server_opts):
+    certfile: Optional[str] = None
+    keyfile: Optional[str] = None
+
+    def __init__(self, *args, certfile = None, keyfile = None, o = None):
+        super().__init__(*args, o = o)
+        if o != None:
+            self.certfile, self.keyfile = o.certfile, o.keyfile
+            return
+        self.certfile = certfile
+        self.keyfile = keyfile
+
+class Wss_server(Thread, Network_server):
+    daemon = True
+    ssl_context: Optional[SSLContext] = None
+    connections: Dict[UUID, Tuple[WebSocketServerProtocol, AsyncQueue]]
+
+    def __init__(self, global_config, uopts:Wss_server_opts):
+        Thread.__init__(self)
+        Network_server.__init__(self, uopts)
+        if self.uopts.certfile is not None:
+            self.ssl_context = SSLContext(PROTOCOL_TLS_SERVER)
+            self.ssl_context.load_cert_chain(self.uopts.certfile, self.uopts.keyfile)
+        self.connections = {}
+        self.start()
+
+    async def monitor_queue(self):
+        while True:
+            item = await get_event_loop().run_in_executor(None, self.sendqueue.get)
+            print(f'Got {item=}')
+            if item is None:
+                for task in all_tasks():
+                    task.cancel()
+                break
+            data, address = item
+            if not isinstance(address, UUID):
+                print(Exception(f'Invalid address, not a UUID: {address=}'))
+                continue
+            await self.connections[address][1].put(data)
+
+    async def sip_to_ws(self, queue:AsyncQueue, websocket:WebSocketServerProtocol):
+        while True:
+            item = await queue.get()
+            await websocket.send(item)
+
+    async def ws_to_sip(self, websocket, path):
+        print(f'New connection {websocket.id=}')
+        queue = AsyncQueue()
+        sender = create_task(self.sip_to_ws(queue, websocket))
+        self.connections[websocket.id] = (websocket, queue)
+        try:
+            while True:
+                data = await websocket.recv()
+                rtime = MonoTime()
+                print(f'Got {data=} from {websocket.id=}')
+                ED2.callFromThread(self.handle_read, data, websocket.id, rtime)
+        except ConnectionClosed:
+            print(f'Connection {websocket.id} closed')
+        finally:
+            del self.connections[websocket.id]
+            sender.cancel()
+
+    async def async_run(self):
+        start_server = ws_serve(
+            self.ws_to_sip, self.uopts.laddress[0], self.uopts.laddress[1], ssl = self.ssl_context,
+            subprotocols = ['sip']
+        )
+        await start_server
+        await self.monitor_queue()
+
+    def run(self):
+        loop = new_event_loop()
+        set_event_loop(loop)
+        try:
+            loop.run_until_complete(self.async_run())
+        except CancelledError:
+            pass
+        finally:
+            loop.close()
+
+if __name__ == '__main__':
+    laddr = ('192.168.23.43', 9876)
+    certfile = '/home/sobomax/server.crt'
+    keyfile = '/home/sobomax/server.key'
+    from sippy.SipRequest import SipRequest
+    def data_callback(data, address, server, rtime):
+        sr = SipRequest(data)
+        print(f'Got {sr=} from {address=}')
+        for rr in (100, 'Trying'), (666, 'Busy Here'):
+            res = sr.genResponse(rr[0], rr[1])
+            server.send_to(str(res), address)
+        ED2.breakLoop()
+    wopts = Wss_server_opts(laddr, data_callback, certfile = certfile, keyfile = keyfile)
+    wserv = Wss_server(None, wopts)
+    ED2.loop()
+#    from time import sleep
+#    sleep(120)
+    wserv.shutdown()