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reduce seek buffering in range cache

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dirtydishes 2026-05-26 00:00:57 -04:00
parent 73eeb09eda
commit 5cd5d2f9ff
5 changed files with 220 additions and 10 deletions
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23
Tests/StreamResolverTests.swift
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@ -36,6 +36,7 @@ struct StreamResolverTests {
testSparseRangeStoreEvictsOutsideWindow()
testSparseRangeStoreTrimsOverlappingWindow()
testRangeCacheSessionCapsResponseRange()
testRangeCachePrefetchPrioritizesSeekOffset()
await testRangeProbeFallsBackWhenServerIgnoresRange()
await testRangeFetcherPreservesHeaders()
print("StreamResolverTests passed")
@ -344,6 +345,28 @@ struct StreamResolverTests {
assertEqual(responseRange, HTTPByteRange(start: 0, end: 1_048_575))
}
private static func testRangeCachePrefetchPrioritizesSeekOffset() {
let session = ProgressiveHTTPRangeCacheSession(
fetcher: HTTPRangeRemoteFetcher(url: URL(string: "https://example.test/video.mkv")!, headers: [:]),
contentLength: 20_000_000,
durationProvider: { 0 }
)
let chunks = session.prefetchChunks(
in: HTTPByteRange(start: 0, end: 4_194_303),
preferredOffset: 2_200_000
)
assertEqual(chunks.prefix(2).map { $0 }, [
HTTPByteRange(start: 2_097_152, end: 3_145_727),
HTTPByteRange(start: 3_145_728, end: 4_194_303)
])
assertEqual(chunks.suffix(2).map { $0 }, [
HTTPByteRange(start: 0, end: 1_048_575),
HTTPByteRange(start: 1_048_576, end: 2_097_151)
])
}
private static func testRangeProbeFallsBackWhenServerIgnoresRange() async {
MockURLProtocol.handler = { request in
if request.httpMethod == "HEAD" {