8 files changed, 268 insertions, 225 deletions

diff --git a/proxy/__init__.py b/proxy/__init__.py
new file mode 100644
index 0000000..fcdb23b
--- /dev/null
+++ b/proxy/__init__.py
@@ -0,0 +1,13 @@
+from starlette.applications import Starlette
+from starlette.routing import Route, WebSocketRoute
+
+from proxy.endpoints import Proxy
+from proxy.websockets import WebsocketProxy
+
+app = Starlette(
+    debug=True,
+    routes=[
+        Route('/{path:path}', Proxy),
+        WebSocketRoute('/{path:path}', WebsocketProxy),
+    ]
+)
diff --git a/proxy/endpoints.py b/proxy/endpoints.py
new file mode 100644
index 0000000..c287a88
--- /dev/null
+++ b/proxy/endpoints.py
@@ -0,0 +1,63 @@
+import logging
+from base64 import b64encode, b64decode
+from uuid import uuid4
+
+from starlette.endpoints import HTTPEndpoint
+from starlette.requests import Request
+from starlette.responses import Response
+
+from proxy.utils import get_path_with_query_string
+from ttun_server.proxy_queue import ProxyQueue
+from ttun_server.types import HttpMessage, HttpMessageType, HttpRequestData
+
+logger = logging.getLogger(__name__)
+
+
+class HeaderMapping:
+    def __init__(self, headers: list[tuple[str, str]]):
+        self._headers = headers
+
+    def items(self):
+        for header in self._headers:
+            yield header
+
+
+class Proxy(HTTPEndpoint):
+    async def dispatch(self) -> None:
+        request = Request(self.scope, self.receive)
+
+        subdomain = request.path_params['subdomain']
+        response = Response(content='Not Found', status_code=404)
+
+        identifier = str(uuid4())
+        response_queue = await ProxyQueue.create_for_identifier(identifier)
+
+        try:
+            request_queue = await ProxyQueue.get_for_identifier(subdomain)
+
+            logger.debug('PROXY %s%s ', subdomain, request.url)
+            await request_queue.enqueue(
+                HttpMessage(
+                    type=HttpMessageType.request.value,
+                    identifier=identifier,
+                    payload=HttpRequestData(
+                        method=request.method,
+                        path=get_path_with_query_string(request),
+                        headers=list(request.headers.items()),
+                        body=b64encode(await request.body()).decode()
+                    )
+                )
+            )
+
+            _response = await response_queue.dequeue()
+            payload = _response['payload']
+            response = Response(
+                status_code=payload['status'],
+                headers=HeaderMapping(payload['headers']),
+                content=b64decode(payload['body'].encode())
+            )
+        except AssertionError:
+            pass
+        finally:
+            await response(self.scope, self.receive, self.send)
+            await response_queue.delete()
diff --git a/proxy/utils.py b/proxy/utils.py
new file mode 100644
index 0000000..2b80f43
--- /dev/null
+++ b/proxy/utils.py
@@ -0,0 +1,7 @@
+from starlette.requests import HTTPConnection
+
+
+def get_path_with_query_string(connection: HTTPConnection) -> str:
+    path = connection.url.path
+    query_string = '?' + connection.scope['query_string'].decode() if connection.scope['query_string'] else ''
+    return f"{path}{query_string}"
diff --git a/proxy/websockets.py b/proxy/websockets.py
new file mode 100644
index 0000000..ef80ec2
--- /dev/null
+++ b/proxy/websockets.py
@@ -0,0 +1,112 @@
+import asyncio
+import json
+import logging
+import typing
+from base64 import b64decode, b64encode
+from contextlib import asynccontextmanager
+from uuid import uuid4
+
+from starlette.endpoints import WebSocketEndpoint
+from starlette.websockets import WebSocket
+
+from proxy.utils import get_path_with_query_string
+from ttun_server.proxy_queue import ProxyQueue
+from ttun_server.types import WebsocketMessage, WebsocketMessageType, WebsocketConnectData, WebsocketMessageData, \
+    WebsocketDisconnectData
+
+logger = logging.getLogger(__name__)
+logger.setLevel('DEBUG')
+
+
+class WebsocketProxy(WebSocketEndpoint):
+    encoding = 'json'
+    websocket_listen_task = None
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.id = str(uuid4())
+
+    @asynccontextmanager
+    async def proxy(self, websocket: WebSocket, message: WebsocketMessage):
+        [subdomain, *_] = websocket.url.hostname.split('.')
+
+        expect_ack = WebsocketMessageType(message['type']) == WebsocketMessageType.connect
+
+        try:
+            request_queue = await ProxyQueue.get_for_identifier(subdomain)
+            await request_queue.enqueue(message)
+
+            if expect_ack:
+                response_queue = await ProxyQueue.create_for_identifier(message["identifier"])
+                yield await response_queue.dequeue()
+                await response_queue.delete()
+            else:
+                yield
+        except AssertionError:
+            yield None
+
+    async def listen_for_messages(self, websocket: WebSocket):
+        response_queue = await ProxyQueue.create_for_identifier(self.id)
+
+        while True:
+            message: WebsocketMessage = await response_queue.dequeue()
+            logger.debug(message)
+            await websocket.send_text(b64decode(message['payload']['body'].encode()).decode())
+
+    async def on_connect(self, websocket: WebSocket) -> None:
+        message = WebsocketMessage(
+            type=WebsocketMessageType.connect.value,
+            identifier=self.id,
+            payload=WebsocketConnectData(
+                path=get_path_with_query_string(websocket),
+                headers=[
+                    (k.decode(), v.decode())
+                    for k, v
+                    in websocket.scope['headers']
+                ],
+            )
+        )
+
+        async with self.proxy(websocket, message) as m:
+            if m is not None and WebsocketMessageType(m['type']) == WebsocketMessageType.ack:
+                await super().on_connect(websocket)
+
+        self.websocket_listen_task = asyncio.create_task(self.listen_for_messages(websocket))
+
+        def callback(*args, **kwargs):
+            self.websocket_listen_task = None
+
+        self.websocket_listen_task.add_done_callback(callback)
+
+    async def on_receive(self, websocket: WebSocket, data: typing.Any) -> None:
+        match data:
+            case dict():
+                data_bytes = json.dumps(data).encode()
+            case bytes():
+                data_bytes = data
+            case _:
+                data_bytes = data.encode()
+
+        message = WebsocketMessage(
+            type=WebsocketMessageType.message.value,
+            identifier=self.id,
+            payload=WebsocketMessageData(
+                body=b64encode(data_bytes).decode(),
+            )
+        )
+
+        async with self.proxy(websocket, message):
+            pass
+
+    async def on_disconnect(self, websocket: WebSocket, close_code: int) -> None:
+        message = WebsocketMessage(
+            type=WebsocketMessageType.disconnect.value,
+            identifier=self.id,
+            payload=WebsocketDisconnectData(
+                close_code=close_code,
+            )
+        )
+
+        async with self.proxy(websocket, message):
+            if self.websocket_listen_task is not None:
+                self.websocket_listen_task.cancel()
diff --git a/ttun_server/__init__.py b/ttun_server/__init__.py
index 6c77858..d54227a 100644
--- a/ttun_server/__init__.py
+++ b/ttun_server/__init__.py
@@ -2,30 +2,23 @@ import logging
 import os
 
 from fastapi import FastAPI
-from starlette.routing import Host, Route, Router, WebSocketRoute
+from starlette.routing import Host, Route, WebSocketRoute
 
-from ttun_server.endpoints import health, proxy
-from .websockets import WebsocketProxy, Tunnel
+from proxy import app as proxy_app
+from ttun_server.endpoints import health, base_endpoints
+from ttun_server.websockets import tunnel
 
 logging.basicConfig(level=getattr(logging, os.environ.get('LOG_LEVEL', 'INFO')))
 
-base_router = Router(routes=[
-    Route('/health/', health),
-    WebSocketRoute('/tunnel/', Tunnel)
-])
-
-server = FastAPI(
+app = FastAPI(
     debug=True,
     routes=[
-        Host(os.environ['TUNNEL_DOMAIN'], base_router, 'base'),
-        Route('/{path:path}', proxy),
-        WebSocketRoute('/{path:path}', WebsocketProxy)
+        WebSocketRoute('/tunnel/', endpoint=tunnel),
+        Route('/health/', endpoint=health),
+        Host(f'{{subdomain}}.{os.environ['TUNNEL_DOMAIN']}', app=proxy_app)