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"""Example Python client for vllm.entrypoints.api_server"""
import argparse
import json
from typing import Iterable, List
import requests
def clear_line(n: int = 1) -> None:
LINE_UP = '\033[1A'
LINE_CLEAR = '\x1b[2K'
for _ in range(n):
print(LINE_UP, end=LINE_CLEAR, flush=True)
def post_http_request(prompt: str,
api_url: str,
n: int = 1,
stream: bool = False) -> requests.Response:
headers = {"User-Agent": "Test Client"}
pload = {
"prompt": prompt,
"n": n,
"use_beam_search": True,
"temperature": 0.0,
"max_tokens": 16,
"stream": stream,
}
response = requests.post(api_url, headers=headers, json=pload, stream=True)
return response
def get_streaming_response(response: requests.Response) -> Iterable[List[str]]:
for chunk in response.iter_lines(chunk_size=8192,
decode_unicode=False,
delimiter=b"\0"):
if chunk:
data = json.loads(chunk.decode("utf-8"))
output = data["text"]
yield output
def get_response(response: requests.Response) -> List[str]:
data = json.loads(response.content)
output = data["text"]
return output
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("--host", type=str, default="localhost")
parser.add_argument("--port", type=int, default=8000)
parser.add_argument("--n", type=int, default=4)
parser.add_argument("--prompt", type=str, default="San Francisco is a")
parser.add_argument("--stream", action="store_true")
args = parser.parse_args()
prompt = args.prompt
api_url = f"http://{args.host}:{args.port}/generate"
n = args.n
stream = args.stream
print(f"Prompt: {prompt!r}\n", flush=True)
response = post_http_request(prompt, api_url, n, stream)
if stream:
num_printed_lines = 0
for h in get_streaming_response(response):
clear_line(num_printed_lines)
num_printed_lines = 0
for i, line in enumerate(h):
num_printed_lines += 1
print(f"Beam candidate {i}: {line!r}", flush=True)
else:
output = get_response(response)
for i, line in enumerate(output):
print(f"Beam candidate {i}: {line!r}", flush=True)
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