Use chunked streaming for ISO file serving to reduce memory#102
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Use chunked streaming for ISO file serving to reduce memory#102
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serve_iso_file() was using ReaderStream which could buffer large amounts of data in memory. For a 2.6GB ISO file, memory usage peaked at 1.9GB. Now uses the same chunked streaming approach as stream_from_iso(): - 32MB chunks via spawn_blocking - Bounded mpsc channel (capacity 2) for backpressure - Max ~96MB in memory (3 chunks: 2 in channel + 1 being read) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Extract common file streaming logic into stream_file_to_channel() - Reuse helper in stream_iso_file() and stream_initrd_with_firmware() - Add test_stream_file_to_channel() for the helper function - Add test_stream_iso_file() to verify chunked streaming works - Add test_stream_iso_file_not_found() for error handling Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Simplify stream_file_to_channel return type to Result<(), Error> - Replace offset tracking with bytes_remaining (cleaner since read_exact advances position) - Add test_stream_file_to_channel_multiple_chunks with 70MB file (3 chunks) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
/iso/ubuntu-22.04/ubuntu-22.04.5-live-server-amd64.iso)serve_iso_file()was usingReaderStreamwhich buffered ~1.9GB for a 2.6GB ISOstream_from_iso())Test plan
watch -n1 'ps -o rss= -p $(pgrep serabutd)'cargo test- all 62 tests pass🤖 Generated with Claude Code