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Launch the Streamlit demo from an installed package.
Why:
- After `pip install visual-rag-toolkit`, the repo layout isn't present.
- We package the `demo/` module and expose `visual_rag.demo()` + `visual-rag-demo`.
"""
from __future__ import annotations
import argparse
import importlib
import os
import subprocess
import sys
from pathlib import Path
from typing import Optional
def demo(
*,
host: str = "0.0.0.0",
port: int = 7860,
headless: bool = True,
open_browser: bool = False,
extra_args: Optional[list[str]] = None,
) -> int:
"""
Launch the Streamlit demo UI.
Requirements:
- `visual-rag-toolkit[ui,qdrant,embedding,pdf]` (or `visual-rag-toolkit[all]`)
Returns:
Streamlit process exit code.
"""
try:
import streamlit # noqa: F401
except Exception as e: # pragma: no cover
raise RuntimeError(
"Streamlit is not installed. Install with:\n"
' pip install "visual-rag-toolkit[ui,qdrant,embedding,pdf]"'
) from e
# Resolve the installed demo entrypoint path.
mod = importlib.import_module("demo.app")
app_path = Path(getattr(mod, "__file__", "")).resolve()
if not app_path.exists(): # pragma: no cover
raise RuntimeError("Could not locate installed demo app (demo.app).")
# Build a stable Streamlit invocation.
cmd = [sys.executable, "-m", "streamlit", "run", str(app_path)]
cmd += ["--server.address", str(host)]
cmd += ["--server.port", str(int(port))]
# headless=true prevents browser from auto-opening; open_browser overrides
should_be_headless = headless and not open_browser
cmd += ["--server.headless", "true" if should_be_headless else "false"]
cmd += ["--browser.gatherUsageStats", "false"]
cmd += ["--server.runOnSave", "false"]
if extra_args:
cmd += list(extra_args)
env = os.environ.copy()
# Make sure the demo doesn't spam internal Streamlit warnings in logs.
env.setdefault("STREAMLIT_BROWSER_GATHER_USAGE_STATS", "false")
return subprocess.call(cmd, env=env)
def main() -> None:
p = argparse.ArgumentParser(description="Launch the Visual RAG Toolkit Streamlit demo.")
p.add_argument("--host", default="0.0.0.0")
p.add_argument("--port", type=int, default=7860)
p.add_argument(
"--no-headless", action="store_true", help="Run with a browser window (not headless)."
)
p.add_argument("--open", action="store_true", help="Open browser automatically.")
args, unknown = p.parse_known_args()
rc = demo(
host=args.host,
port=args.port,
headless=(not args.no_headless),
open_browser=bool(args.open),
extra_args=unknown,
)
raise SystemExit(rc)
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