Resumable downloads. #84
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McPatate
reviewed
Dec 30, 2024
| let new_size = (size as f32 * truncate) as u64; | ||
| file.set_len(new_size).unwrap(); | ||
| let mut blob_part = blob.clone(); | ||
| blob_part.set_extension(".part"); |
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It's done on purpose to have it hardcoded in the test. I don't want my test to change when library code changes.
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| let mut res = self.download_from(url, 0u64, size, &mut file, filename, &mut progress); | ||
| let mut file = match std::fs::OpenOptions::new().append(true).open(&filepath) { |
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Suggested change
| let mut file = match std::fs::OpenOptions::new().append(true).open(&filepath) { | |
| let mut part_file = match std::fs::OpenOptions::new().append(true).open(&filepath) { |
src/api/tokio.rs
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| .await | ||
| { | ||
| Ok(mut f) => { | ||
| let len = f.metadata().await.unwrap().len(); |
| 0 | ||
| } | ||
| } | ||
| Err(_err) => { |
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| Err(_err) => { | |
| Err(_) => { |
This was referenced Dec 30, 2024
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Notes on the strategy here.
Sync:
Tokio:
Since we're multiplexing, writes are not happening in order. We could:
u64at the very end of the partial file. When resuming, we read that single int, and resume from there. Anything fishy and we drop the resumability.This feels simpler that the more complex version, seems to work quite well in practice (only tested on stable networks right now).
The probability for storing invalid files seems low (since commit happens at a single location both in code and in file).