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cache: Serve Range GET from disk when present #44

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linus merged 1 commits from moss/cache-range-from-disk into develop 2026-09-07 11:37:06 -05:00
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Author SHA1 Message Date
moss ac2d36f1ad cache: Serve Range GET from disk when present
CI / vulncheck (pull_request) Successful in 15s
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CI / check-and-test (pull_request) Successful in 41s
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Steam clients lean on Range requests. Hit/miss looked fine while downloads
still felt cold when a Range miss returned the full upstream body as 200.

Add range_cache / range_upstream metrics. HIT path already sliced 206 from
the cached full object; count range_cache there. On MISS, keep stripping
Range for the upstream fetch (full object still cached) but serve the
client's requested slice as 206 and count range_upstream.

Tests in steamcache/range_test.go cover Range HIT (local, no upstream),
Range MISS (206 + full object cached), and /metrics emission.
 2026-09-07 16:32:36 +00:00