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perf(x-media): give the slot-holding fallback download its own budget

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download_media_limited had one hard-coded total (600s) for every caller, and its heaviest caller — the bot's upload fallback — holds a PREP slot (and its memory reservation) for the whole transfer: six slow-but-alive downloads (a byte every 29s satisfies the idle window) could stall the fallback chain for ten minutes, queue retries included. The budget is a parameter now: the fallback passes 300s of its own (50 MiB in 300s ≈ 1.4 Mbit/s; a slower link is better served by retrying toward the item's smaller URL than by pinning a slot), while bsky's in-fetch HLS segments keep the generous 600s DOWNLOAD_TOTAL_TIMEOUT, now pub(crate) and re-exported for them. download_too_slow reports whichever budget it got.
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YoursFunny
2026-09-24 03:37:38 +08:00
parent 8f254c3779
commit 0e91753402
4 changed files with 58 additions and 22 deletions
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crates/x-media/src/site/mod.rs
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@@ -22,7 +22,7 @@ pub mod twitter;
pub use pixiv::PixivError;
pub(crate) use download::CLIENT;
pub(crate) use download::{CLIENT, DOWNLOAD_TOTAL_TIMEOUT};
pub use download::{download_media_limited, download_media_to_file};
/// The result of fetching a post: canonical URL, HTML caption, the post's