pax/booru-viewer
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Throttle prefetch: only next+prev, 1s stagger, sequential

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Reduced from 3 concurrent prefetches to 2 sequential with 1s
delay between them. Avoids hitting Danbooru's 10 req/s rate limit.
This commit is contained in:
pax 2026-04-05 00:28:35 -05:00
parent a5f33237dd
commit a9d177ee91
1 changed files with 12 additions and 12 deletions
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24
booru_viewer/gui/app.py
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@ -765,18 +765,18 @@ class BooruApp(QMainWindow):
self._prefetch_adjacent(index) self._prefetch_adjacent(index)
def _prefetch_adjacent(self, index: int) -> None: def _prefetch_adjacent(self, index: int) -> None:
"""Silently download the next and previous posts in the background.""" """Silently download adjacent posts with staggered delays."""
for offset in (1, -1, 2): async def _prefetch_batch():
adj = index + offset for i, offset in enumerate((1, -1)):
if 0 <= adj < len(self._posts): adj = index + offset
url = self._posts[adj].file_url if 0 <= adj < len(self._posts) and self._posts[adj].file_url:
if url: if i > 0:
async def _prefetch(u=url): await asyncio.sleep(1)
try: try:
await download_image(u) await download_image(self._posts[adj].file_url)
except Exception: except Exception:
pass pass
self._run_async(_prefetch) self._run_async(_prefetch_batch)
def _on_download_progress(self, downloaded: int, total: int) -> None: def _on_download_progress(self, downloaded: int, total: int) -> None:
if total > 0: if total > 0: