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Running on Zero
File size: 4,776 Bytes
c2e7942 574d595 c2e7942 574d595 c2e7942 574d595 c2e7942 9cb7d65 c2e7942 574d595 c2e7942 574d595 c2e7942 574d595 c2e7942 9cb7d65 c2e7942 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | """Render generated Manim scenes in an isolated subprocess."""
from __future__ import annotations
import shutil
import subprocess
import tempfile
import time
import uuid
from dataclasses import dataclass
from pathlib import Path
import re
import sys
from typing import Tuple
OUTPUT_DIR = Path("./output")
SCENE_CLASS_PATTERN = re.compile(r"class\s+(\w+)\s*\(\s*\w*Scene\w*\s*\):")
@dataclass
class RenderResult:
success: bool
video_path: str | None
info: str
errors: str
def find_scene_name(code: str) -> str:
"""Extract the first Manim Scene class name from generated Python code."""
match = SCENE_CLASS_PATTERN.search(code)
return match.group(1) if match else "MainScene"
def _manim_command_prefix() -> list[str]:
"""Return a command prefix for Manim.
Hugging Face Spaces occasionally installs the Python package correctly
without exposing the `manim` console script on PATH. `python -m manim`
still works in that case, so keep it as the final fallback.
"""
for command in ("manim", "manimce"):
if shutil.which(command):
return [command]
return [sys.executable, "-m", "manim"]
def render_code(
code: str,
timeout_seconds: int = 600,
output_dir: Path = OUTPUT_DIR,
quality: str = "-ql",
) -> RenderResult:
"""Render Manim code and return a structured result.
This mirrors the robust approach used by manim-trainer: use a temporary
script and a temporary media directory to avoid collisions, then write only
the final MP4 into the app's output folder.
"""
if not code or not code.strip():
return RenderResult(False, None, "", "No Manim code was provided.")
output_dir.mkdir(parents=True, exist_ok=True)
scene_name = find_scene_name(code)
video_name = f"{scene_name}_{uuid.uuid4().hex[:12]}_{int(time.time())}"
final_video_base = output_dir / video_name
temp_script_name = ""
try:
with tempfile.NamedTemporaryFile(
mode="w",
suffix=".py",
prefix="temp_scene_",
encoding="utf-8",
delete=False,
) as temp_script:
temp_script.write(code)
temp_script.flush()
temp_script_name = temp_script.name
with tempfile.TemporaryDirectory(prefix="scivisual_manim_") as temp_media_dir:
command = _manim_command_prefix() + [
temp_script_name,
scene_name,
quality,
"--format=mp4",
"--media_dir",
temp_media_dir,
"-o",
str(final_video_base.absolute()),
]
result = subprocess.run(
command,
capture_output=True,
text=True,
timeout=timeout_seconds,
check=False,
)
stdout = result.stdout.strip()
stderr = result.stderr.strip()
if result.returncode != 0:
error_log = stderr or stdout or f"Manim failed with return code {result.returncode}."
return RenderResult(False, None, stdout, error_log)
final_video_path = final_video_base.with_suffix(".mp4")
if final_video_path.exists():
return RenderResult(True, str(final_video_path), stdout, stderr)
return RenderResult(
False,
None,
stdout,
f"Manim reported success, but no MP4 was found at {final_video_path}. STDERR: {stderr}",
)
except FileNotFoundError as exc:
return RenderResult(
False,
None,
"",
"Manim could not be launched. Ensure the `manim` Python package is installed. "
f"Attempted fallback command: `{sys.executable} -m manim`. Details: {exc}",
)
except subprocess.TimeoutExpired as exc:
stdout = exc.stdout or ""
stderr = exc.stderr or ""
return RenderResult(
False,
None,
stdout,
f"Rendering timed out after {timeout_seconds} seconds.\n\nSTDERR:\n{stderr}",
)
except Exception as exc: # pragma: no cover - runtime safety guard
return RenderResult(False, None, "", f"Unexpected render failure: {type(exc).__name__}: {exc}")
finally:
if temp_script_name:
Path(temp_script_name).unlink(missing_ok=True)
def render_manim_scene(code: str, timeout_seconds: int = 600) -> Tuple[bool, str]:
"""Compatibility wrapper returning the tuple shape used by the app."""
result = render_code(code, timeout_seconds=timeout_seconds)
if result.success and result.video_path:
return True, result.video_path
return False, result.errors or result.info
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