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import asyncio
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import aiohttp
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from aiohttp import web
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import uuid
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import pathlib
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class OllamaServer:
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def __init__(self, ws, models):
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self.ws = ws
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self.queues = {}
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self.models = models
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@property
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def model_names(self):
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return [model['name'] for model in self.models]
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async def forward_to_http(self, request_id, message):
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if request_id not in self.queues:
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self.queues[request_id] = asyncio.Queue()
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await self.queues[request_id].put(message)
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async def forward_to_websocket(self, request_id, message, path):
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self.queues[request_id] = asyncio.Queue()
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await self.ws.send_json(dict(request_id=request_id, data=message, path=path))
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while True:
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chunk = await self.queues[request_id].get()
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yield chunk
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if chunk['done']:
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break
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async def serve(self):
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async for msg in self.ws:
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if msg.type == web.WSMsgType.TEXT:
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data = msg.json()
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request_id = data['request_id']
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await self.forward_to_http(request_id, data['data'])
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elif msg.type == web.WSMsgType.ERROR:
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break
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class ServerManager:
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def __init__(self):
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self.servers = []
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def add_server(self, server):
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self.servers.append(server)
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def remove_server(self, server):
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self.servers.remove(server)
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async def forward_to_websocket(self, request_id, message, path):
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try:
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server = self.servers.pop(0)
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self.servers.append(server)
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async for msg in server.forward_to_websocket(request_id, message, path):
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yield msg
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except:
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raise
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server_manager = ServerManager()
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async def websocket_handler(request):
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ws = web.WebSocketResponse()
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await ws.prepare(request)
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models = await ws.receive_json()
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server = OllamaServer(ws, models['models'])
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server_manager.add_server(server)
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async for msg in ws:
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if msg.type == web.WSMsgType.TEXT:
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data = msg.json()
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await server.forward_to_http(data['request_id'], data['data'])
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elif msg.type == web.WSMsgType.ERROR:
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print(f'WebSocket connection closed with exception: {ws.exception()}')
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server_manager.remove_server(server)
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return ws
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async def http_handler(request):
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request_id = str(uuid.uuid4())
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data = None
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try:
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data = await request.json()
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except ValueError:
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return web.Response(status=400)
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resp = web.StreamResponse(headers={'Content-Type': 'application/x-ndjson', 'Transfer-Encoding': 'chunked'})
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await resp.prepare(request)
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import json
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async for result in server_manager.forward_to_websocket(request_id, data, path=request.path):
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await resp.write(json.dumps(result).encode() + b'\n')
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await resp.write_eof()
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return resp
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async def index_handler(request):
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index_template = pathlib.Path("index.html").read_text()
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client_py = pathlib.Path("client.py").read_text()
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index_template = index_template.replace("#client.py", client_py)
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return web.Response(text=index_template, content_type="text/html")
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app = web.Application()
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app.router.add_get("/", index_handler)
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app.router.add_route('GET', '/publish', websocket_handler)
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app.router.add_route('POST', '/api/chat', http_handler)
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if __name__ == '__main__':
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web.run_app(app, port=1984)
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