# Written by retoor@molodetz.nl
# This code creates a server using asyncio and aiohttp that manages websocket and HTTP connections to forward messages between them.
# Used Imports: asyncio, aiohttp
# The MIT License (MIT)
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import asyncio
import aiohttp
from aiohttp import web
import uuid
import pathlib
class OllamaServer:
def __init__(self,ws,models):
self.ws = ws
self.queues = {}
self.models = models
print("New OllamaServer created")
print(self.model_names)
@property
def model_names(self):
return [model['name'] for model in self.models]
async def forward_to_http(self, request_id, message):
if not request_id in self.queues:
self.queues[request_id] = asyncio.Queue()
await self.queues[request_id].put(message)
async def forward_to_websocket(self, request_id, message,path):
self.queues[request_id] = asyncio.Queue()
await self.ws.send_json(dict(request_id=request_id, data=message,path=path))
while True:
chunk = await self.queues[request_id].get()
yield chunk
if chunk['done']:
break
async def serve(self):
async for msg in self.ws:
if msg.type == web.WSMsgType.TEXT:
data = msg.json()
request_id = data['request_id']
await self.forward_to_http(request_id, data['data'])
elif msg.type == web.WSMsgType.ERROR:
break
class ServerManager:
def __init__(self):
self.servers = []
def add_server(self, server):
self.servers.append(server)
def remove_server(self, server):
self.servers.remove(server)
async def forward_to_websocket(self, request_id, message,path):
try:
server = self.servers.pop(0)
self.servers.append(server)
async for msg in server.forward_to_websocket(request_id, message,path):
yield msg
except:
raise
server_manager = ServerManager()
async def websocket_handler(request):
ws = web.WebSocketResponse()
await ws.prepare(request)
models = await ws.receive_json()
server = OllamaServer(ws,models['models'])
server_manager.add_server(server)
async for msg in ws:
if msg.type == web.WSMsgType.TEXT:
data = msg.json()
await server.forward_to_http(data['request_id'], data['data'])
elif msg.type == web.WSMsgType.ERROR:
print(f'WebSocket connection closed with exception: {ws.exception()}')
server_manager.remove_server(server)
return ws
async def http_handler(request):
request_id = str(uuid.uuid4())
data = None
try:
data = await request.json()
except ValueError:
return web.Response(status=400)
resp = web.StreamResponse(headers={'Content-Type': 'application/x-ndjson','Transfer-Encoding': 'chunked'})
await resp.prepare(request)
import json
async for result in server_manager.forward_to_websocket(request_id, data,path=request.path):
await resp.write(json.dumps(result).encode() + b'\n')
await resp.write_eof()
return resp
async def index_handler(request):
index_template = pathlib.Path("index.html").read_text()
client_py = pathlib.Path("client.py").read_text()
index_template = index_template.replace("#client.py", client_py)
return web.Response(text=index_template, content_type="text/html")
app = web.Application()
app.router.add_get("/", index_handler)
app.router.add_route('GET', '/publish', websocket_handler)
app.router.add_route('POST', '/api/chat', http_handler)
if __name__ == '__main__':
web.run_app(app, port=8080)