257 lines
11 KiB
Python
257 lines
11 KiB
Python
import json
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import time
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import traceback
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from flask import request
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from . import bp
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from ..helpers.http import require_api_key, validate_json
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from ..ooba_request_handler import OobaRequestHandler
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from ..queue import decr_active_workers, decrement_ip_count, priority_queue
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from ... import opts
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from ...database.database import log_prompt
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from ...llm.generator import generator
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from ...llm.vllm import tokenize
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from ...sock import sock
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# Stacking the @sock.route() creates a TypeError error on the /v1/stream endpoint.
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# We solve this by splitting the routes
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@bp.route('/stream')
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def stream():
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return 'This is a websocket endpoint.', 400
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@sock.route('/stream', bp=bp)
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def stream_without_model(ws):
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do_stream(ws, model_name=None)
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@sock.route('/<model_name>/v1/stream', bp=bp)
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def stream_with_model(ws, model_name=None):
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do_stream(ws, model_name)
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def do_stream(ws, model_name):
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def send_err_and_quit(quitting_err_msg):
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ws.send(json.dumps({
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'event': 'text_stream',
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'message_num': 0,
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'text': quitting_err_msg
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}))
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ws.send(json.dumps({
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'event': 'stream_end',
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'message_num': 1
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}))
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ws.close()
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log_prompt(ip=handler.client_ip,
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token=handler.token,
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prompt=input_prompt,
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response=quitting_err_msg,
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gen_time=elapsed_time,
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parameters=handler.parameters,
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headers=r_headers,
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backend_response_code=response_status_code,
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request_url=r_url,
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backend_url=handler.cluster_backend_info,
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response_tokens=tokenize(generated_text, handler.backend_url),
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is_error=True
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)
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if not opts.enable_streaming:
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return 'Streaming is disabled', 500
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r_headers = dict(request.headers)
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r_url = request.url
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message_num = 0
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while ws.connected:
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message = ws.receive()
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request_valid_json, request_json_body = validate_json(message)
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if not request_valid_json or not request_json_body.get('prompt'):
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ws.close()
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return 'Invalid JSON', 400
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else:
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if opts.mode != 'vllm':
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# TODO: implement other backends
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raise NotImplementedError
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auth_failure = require_api_key(request_json_body)
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if auth_failure:
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ws.close()
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return auth_failure
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handler = OobaRequestHandler(request, model_name, request_json_body)
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generated_text = ''
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input_prompt = request_json_body['prompt']
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response_status_code = 0
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start_time = time.time()
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err_msg = None
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if handler.is_client_ratelimited():
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r, _ = handler.handle_ratelimited(do_log=False)
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err_msg = r.json['results'][0]['text']
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else:
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request_valid, invalid_response = handler.validate_request(prompt=input_prompt)
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if not request_valid:
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err_msg = invalid_response[0].json['results'][0]['text']
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if err_msg:
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send_err_and_quit(err_msg)
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return
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llm_request = {
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**handler.parameters,
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'prompt': input_prompt,
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'stream': True,
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}
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# Add a dummy event to the queue and wait for it to reach a worker
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event = priority_queue.put((None, handler.client_ip, handler.token, None, None), handler.token_priority, handler.backend_url)
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if not event:
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r, _ = handler.handle_ratelimited()
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err_msg = r.json['results'][0]['text']
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send_err_and_quit(err_msg)
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return
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try:
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response = generator(llm_request, handler.backend_url)
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if not response:
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error_msg = 'Failed to reach backend while streaming.'
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print('Streaming failed:', error_msg)
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msg = handler.handle_error(error_msg)[0].json['results'][0]['text']
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ws.send(json.dumps({
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'event': 'text_stream',
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'message_num': message_num,
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'text': msg
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}))
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else:
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# Be extra careful when getting attributes from the response object
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try:
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response_status_code = response.status_code
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except:
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response_status_code = 0
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partial_response = b''
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for chunk in response.iter_content(chunk_size=1):
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partial_response += chunk
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if partial_response.endswith(b'\x00'):
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json_strs = partial_response.split(b'\x00')
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for json_str in json_strs:
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if json_str:
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try:
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json_obj = json.loads(json_str.decode())
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new = json_obj['text'][0].split(input_prompt + generated_text)[1]
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generated_text = generated_text + new
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except IndexError:
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# ????
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continue
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try:
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ws.send(json.dumps({
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'event': 'text_stream',
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'message_num': message_num,
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'text': new
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}))
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except:
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# The has client closed the stream.
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if request:
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request.close()
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try:
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ws.close()
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except:
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pass
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end_time = time.time()
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elapsed_time = end_time - start_time
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log_prompt(ip=handler.client_ip,
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token=handler.token,
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prompt=input_prompt,
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response=generated_text,
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gen_time=elapsed_time,
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parameters=handler.parameters,
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headers=r_headers,
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backend_response_code=response_status_code,
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request_url=r_url,
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backend_url=handler.backend_url,
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response_tokens=tokenize(generated_text, handler.backend_url)
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)
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return
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message_num += 1
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partial_response = b'' # Reset the partial response
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# If there is no more data, break the loop
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if not chunk:
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break
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end_time = time.time()
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elapsed_time = end_time - start_time
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log_prompt(ip=handler.client_ip,
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token=handler.token,
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prompt=input_prompt,
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response=generated_text,
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gen_time=elapsed_time,
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parameters=handler.parameters,
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headers=r_headers,
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backend_response_code=response_status_code,
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request_url=r_url,
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backend_url=handler.backend_url,
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response_tokens=tokenize(generated_text, handler.backend_url),
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is_error=not response
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)
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except:
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traceback.print_exc()
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generated_text = generated_text + '\n\n' + handler.handle_error('Encountered error while streaming.', 'exception')[0].json['results'][0]['text']
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ws.send(json.dumps({
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'event': 'text_stream',
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'message_num': message_num,
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'text': generated_text
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}))
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if request:
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request.close()
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ws.close()
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log_prompt(ip=handler.client_ip,
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token=handler.token,
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prompt=input_prompt,
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response=generated_text,
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gen_time=None,
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parameters=handler.parameters,
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headers=r_headers,
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backend_response_code=response_status_code,
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request_url=r_url,
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backend_url=handler.backend_url,
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response_tokens=tokenize(generated_text, handler.backend_url),
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is_error=True
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)
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return
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finally:
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# The worker incremented it, we'll decrement it.
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decrement_ip_count(handler.client_ip, 'processing_ips')
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decr_active_workers(handler.selected_model, handler.backend_url)
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try:
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ws.send(json.dumps({
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'event': 'stream_end',
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'message_num': message_num
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}))
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except:
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# The client closed the stream.
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end_time = time.time()
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elapsed_time = end_time - start_time
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log_prompt(ip=handler.client_ip,
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token=handler.token,
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prompt=input_prompt,
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response=generated_text,
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gen_time=elapsed_time,
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parameters=handler.parameters,
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headers=r_headers,
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backend_response_code=response_status_code,
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request_url=r_url,
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backend_url=handler.backend_url,
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response_tokens=tokenize(generated_text, handler.backend_url)
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)
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try:
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ws.close() # this is important if we encountered and error and exited early.
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except:
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pass
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