fix: give every item its own share of a shared peer directory - #86
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slskd groups transfers by peer directory, and the manager handed each directory to a single item found by probing only the group's first file. Two albums can legitimately download from one directory -- the single/EP pluck takes one track out of a compilation folder -- and then the item that lost the probe was never given any transfers at all: it sat at Queued until it timed out and blocklisted a release that was downloading fine. The winner meanwhile saw the other item's files, could adopt a foreign batch id along with DiscFoldersMerged, and could derive its subdirectory from a foreign filename. A directory is now partitioned per owning item, so each item sees only the transfers slskd accepted for it, with the leftovers still offered to the history/inclusive adoption path. FindItemOwningDirectory is gone -- the partitioner subsumes it -- and the adoption and per-item application that used to be inline are now their own methods.
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. 📝 WalkthroughWalkthroughThe change adds directory partitioning for shared Soulseek downloads. The download manager resolves ownership slices, adopts unknown slices, and applies transfer data independently to each tracked item. ChangesSoulseek directory ownership
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to This change correctly partitions shared peer directories so co-owned downloads receive their accepted files independently, but recovery and stable-hash fallback can still associate foreign or enqueue-rejected transfer metadata with the wrong item, affecting batch, destination, or lifecycle state. These bounded correctness risks should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant ProcessUserTransfers
participant SlskdDirectoryPartitioner
participant ApplyDirectoryToItem
ProcessUserTransfers->>SlskdDirectoryPartitioner: partition directory and combine keyed owner
SlskdDirectoryPartitioner-->>ProcessUserTransfers: return ownership slices
ProcessUserTransfers->>ApplyDirectoryToItem: apply slice and transfer data
ApplyDirectoryToItem-->>ProcessUserTransfers: update item and process completion
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In `@src/Sleezer/Download/Clients/Soulseek/SlskdDownloadManager.cs`:
- Around line 858-861: Update ResolveDirectoryOwners so the direct GetItem match
using SlskdDownloadItem.GetStableMD5Id remains an additional owner rather than
an early return. Run the existing partitioning logic as well, then union or
deduplicate the direct match with the partitioned owners before returning,
ensuring co-owners of subset transfers are preserved.
- Around line 883-909: In the history-adoption branch of the item lookup, check
whether history.DownloadId is already tracked before constructing or adding a
new SlskdDownloadItem. Return null for an already-tracked ID, and preserve the
existing adoption flow for untracked history records and inclusive fallback
handling.
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src/Sleezer/Download/Clients/Soulseek/SlskdDirectoryPartitioner.cssrc/Sleezer/Download/Clients/Soulseek/SlskdDownloadManager.cstests/Sleezer.Tests/Sleezer.Tests.csprojtests/Sleezer.Tests/SlskdDirectoryPartitionerTests.cs
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Two holes in the partitioned attribution: The whole-directory hash match returned that item as the sole owner, so a second item that enqueued only part of the directory -- the single/EP pluck case this PR exists for -- still got no transfers. The hash match is now merged into the partitioned owners instead of short-circuiting them. Adoption could also rebuild an item that is already tracked: the history probe matches on the enqueued set, so a live item's own enqueue-rejected file resolves back to its grab, and AddItem overwrites by ID -- dropping the file states, batch id and post-process tasks it had accumulated. Adoption now declines an ID that is already tracked.
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slskd reports transfers grouped by peer directory, and the manager assigned each directory to exactly one item — found by probing only the group's first file. That holds while a peer directory belongs to a single release, but the single/EP pluck grabs one track out of a larger shared folder, so two Lidarr albums can legitimately end up downloading from the same directory. When they do:
batchIdcould be adopted as its own (takingDiscFoldersMergedwith it), andDerivedSubdirectorycould be derived from a foreign filename.OwnsFilerather than the accepted-ownership predicate.#83 and #84 guarded every consumer of that contaminated view. This fixes the source: a peer directory is now partitioned by owning item, so each item only ever sees the transfers slskd accepted for it, and nothing starves.
Shape
A new pure helper,
SlskdDirectoryPartitioner, splits a directory into one slice per owning item plus whatever no tracked item claimed. The manager keeps a fast path for the common case — a directory whose file set hashes to a known item is passed through untouched — and otherwise applies each slice to its own item, then runs the existing history/inclusive adoption on the leftovers.FindItemOwningDirectoryis deleted; the partitioner subsumes it.ProcessUserTransfersis now a short loop, with the adoption and per-item application it used to inline extracted as verbatim moves.Two items that both enqueued the same remote file each get it in their slice, since one physical transfer serves both.
The guards added in #83 and #84 are deliberately left in place as defense in depth — they now protect against a class of contamination that should no longer arise.
Incidental improvement
A file-less peer directory previously caused inclusive mode to fabricate an item with nothing in it. It now yields no owners and no leftovers, so no item is created.
Tests
The partitioner is pure, so the cases that were previously unreachable in this test project are now covered directly: shared directories, a first file belonging to the other item, enqueue-rejected files, untracked files, username mismatches, the same file owned twice, and the empty directory. The shared-directory case was verified failing against first-file-wins semantics before the fix.
Summary by CodeRabbit
New Features
Bug Fixes