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std migration stage 1 (#59) - #71
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…eap headers First increment of the stage 1 container migration. These three have no consumers anywhere in Source/, Samples/, Tests/ or DependentExtensions/: - ds_ordered_channel_heap.h: OrderedChannelHeap is named by nothing but its own header. Not listed in the issue; found while mapping Heap's consumers. - ds_weighted_graph.h: only connection_graph2.h included it, and never names WeightedGraph. - ds_tree.h: only ds_weighted_graph.h used DataStructures::Tree. Removing them also removes two of the four DataStructures::Heap uses in the tree, leaving only the two real ones in reliability_layer.h. connection_graph2.h gains a direct include of ds_ordered_list.h. It names DataStructures::OrderedList in three declarations but never included it: the type was reaching it transitively through ds_weighted_graph.h, so deleting that header broke the build. The issue's note that connection_graph2.h "includes but does not use" WeightedGraph was right about the type and wrong about the dependency. Also drops the three entries from the header list in Source/CMakeLists.txt. Verified on macOS arm64: full ctest 285/285.
…te BPlusTree Second increment of the stage 1 container migration, and an API break: it changes a public signature on an installed header, which #59 had scoped as API-neutral. Taken deliberately after confirming Table is the only consumer BPlusTree has. Two corrections to the issue's scope table: - It lists reliability_layer.h as a BPlusTree consumer for "split-packet channel lookup". It is not one. The member there is commented out, the datagramMessageIDTree code in reliability_layer.cpp sits inside a /* */ block and the symbol has no declaration anywhere. Only the #include was real, and it is now gone. So nothing performance-sensitive is touched by this commit. - It puts Table out of scope in every stage while also requiring no DataStructures:: use of the listed containers to remain, which cannot both hold: Table holds the rows and returns the tree from a public GetRows(). Changes: - Table::rows becomes std::map<unsigned, Row*>. std::map iterates ascending by key exactly as the B+ tree leaf chain did, so query, sort and serialization order are unchanged -- including the wire order of rows, so a peer on the old code deserializes a new peer's table identically. - GetRows() returns const std::map<unsigned, Row*>&. - GetListHead() is removed. It returned a B+ tree leaf page and had no caller; the Page it exposed is the tree's node type from ds_bplus_tree.h, unrelated to the MemoryPool Page that the issue keeps out of scope. - _TABLE_BPLUS_TREE_ORDER is removed, being meaningless without the tree. - Consumers updated: table_serializer.cpp, and four leaf-page walks in DependentExtensions/Lobby2/Rooms/RoomsContainer.cpp. - ds_bplus_tree.h deleted. Tests/Unit/TableTests.cpp is new, because Table had no coverage whatsoever: the migration compiled and the whole existing suite passed without a single row being exercised. 16 cases pin the behaviour the B+ tree provided, in particular the two properties a keyed-container swap can break silently -- ascending row-id iteration order everywhere it is observable, and AddRow refusing a duplicate id rather than overwriting. Checked that they bite: a mutant dropping the duplicate-id refusal fails 4 of them. The serialization case needs StringCompressor::AddReference(), since TableSerializer dereferences that singleton and no RakPeer exists to take the reference in a hermetic test; without it the serializer segfaults, which is pre-existing and documented on StringCompressor::Instance(). Verified on macOS arm64: full ctest 301/301, samples build including Lobby2 clean, and the Table suite clean under AddressSanitizer.
…List
Third increment of the stage 1 container migration.
The issue lists LinkedList's consumers as reliability_layer.{h,cpp}. They are
not consumers: the orderingList member is commented out in the header and
every use in reliability_layer.cpp (lines 583, 1230, 3663) sits inside a /* */
block. The only live consumer is the Huffman tree, so again nothing
performance-sensitive is touched here -- and the tree is built once per
StringCompressor, not per packet.
DataStructures::LinkedList is a circular cursor list, so the insertion sort
was expressed as Beginning()/Peek()/operator++/Insert() with a counter to
detect running off the end. With std::list it is a find-then-insert, and the
separate "add to the end" branch disappears because insert() before end()
already does that.
The placement rule is preserved exactly: advance past every node strictly
lighter than the new one, then insert, so a new node precedes existing nodes
of equal weight. That tie-breaking decides the tree's shape, which decides
the bit pattern each character encodes to, so getting it wrong would change
what goes on the wire while still round-tripping perfectly in process.
Tests/Unit/HuffmanEncodingTests.cpp pins the encoding with golden bytes
captured from the pre-migration build, and the migrated code reproduces them
byte for byte across four inputs. Checked that the golden values bite: a
one-character mutant flipping the comparison to <= fails three of them, while
the round-trip case still passes -- which is why the tests are golden bytes
rather than an encode/decode loop.
Multilist needs no change. Every use under Source/ is commented out
(udp_proxy_client.h, udp_proxy_coordinator.{h,cpp}), so the issue's acceptance
criterion is already met there, but ds_multilist.h cannot be deleted:
DependentExtensions/Lobby2/Steam and DependentExtensions/SQLite3Plugin use it
for real.
Verified on macOS arm64: full ctest 306/306, samples build including Lobby2
clean.
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughTable row storage changes from a B+ tree to an ordered map. Table operations and consumers are updated to use the map. Several data-structure headers are removed, and Huffman encoding switches to ChangesContainer and data-structure updates
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Merge Risk: ⚪ Minimal · up to No PR-introduced issue requiring a fix before merge was established. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 28.21% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 117 functions across 15 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title accurately identifies the main change as the first stage of migrating custom data structures to the C++ standard library. It is concise and relevant to the changeset.
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I’m a rabbit; I hop past the rows,
Where keys line up in map-shaped rows.
Huffman nodes now march in a list,
With golden bytes checked off the list.
Old headers leave the burrow behind,
And round-trip tests keep order in mind.
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Inline comments:
Review comments at @Source/src/ds_table.cpp:
- Line 384: Update the AddRow overloads that assign to rows[rowId] to use the
same duplicate-key check as AddRow(unsigned); when insertion fails, delete the
newly allocated row with DeleteRow and return 0, preserving the existing row.
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📒 Files selected for processing (15)
DependentExtensions/Lobby2/Rooms/RoomsContainer.cppSource/CMakeLists.txtSource/include/mafianet/connection_graph2.hSource/include/mafianet/ds_bplus_tree.hSource/include/mafianet/ds_huffman_encoding_tree.hSource/include/mafianet/ds_ordered_channel_heap.hSource/include/mafianet/ds_table.hSource/include/mafianet/ds_tree.hSource/include/mafianet/ds_weighted_graph.hSource/include/mafianet/reliability_layer.hSource/src/ds_huffman_encoding_tree.cppSource/src/ds_table.cppSource/src/table_serializer.cppTests/Unit/HuffmanEncodingTests.cppTests/Unit/TableTests.cpp
💤 Files with no reviewable changes (6)
- Source/include/mafianet/ds_ordered_channel_heap.h
- Source/include/mafianet/ds_weighted_graph.h
- Source/include/mafianet/ds_tree.h
- Source/include/mafianet/reliability_layer.h
- Source/include/mafianet/ds_bplus_tree.h
- Source/CMakeLists.txt
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…ange RangeList::Insert had a missed-merge bug on the acknowledgement path. The "insert here" branch compared the new value only against the range AT the insertion point, never against the range before it, so a value one above the previous range's maximum became a range of its own instead of extending that range. Minimal reproduction, found by brute-forcing every ordering of every subset of 0..5: Insert(0), Insert(3), Insert(1) produced [0,0] [1,1] [3,3] where [0,1] [3,3] was correct. Coverage was never wrong -- IsWithinRange and RangeSum both agreed with a reference model -- so no acknowledgement was ever lost. The cost is that the list carries entries it does not need, and Serialize() turns every entry into bytes in the ACK/NAK message: one byte of min-equals-max flag plus one or two sequence numbers each. It also pushes Size() nearer the RakAssert(ranges.Size() < (unsigned short)-1) bound. The pattern that triggers it is ordinary: acks 0..5 arrive, 8 arrives early leaving a gap, then 6 arrives and starts a new entry rather than extending [0,5]. Any reordering or loss followed by a late retransmit hits it, so ack lists fragment more than they should on exactly the networks where ack size matters most. No right-hand fuse is needed in the new path: the branch is only entered when index+1 < minIndex, so extending the previous range cannot make it adjacent to the next one. Brute force over the same space finds no remaining divergence. Tests/Unit/RangeListTests.cpp is new -- RangeList had none at all despite sitting on the ack path of every datagram and owning a wire format. 14 cases, written against the pre-fix implementation so they would catch exactly this: three of them failed before the fix. The load-bearing ones drive the real structure and a std::set model with the same fixed-seed inserts and compare coverage, range count and sum after every step, once with uniform random values in a small window and once with an ack-like arrival pattern of in-order acks, early arrivals and late retransmits. Serialize() output is pinned with golden bytes, since it is protocol rather than an implementation detail. The fix does not change them for that case. On the stage 1 migration: RangeList itself stays. The issue offers "std::vector of ranges, or keep a small purpose-built type", and the merge semantics are the reason the type exists. Its internal DataStructures::OrderedList is a stage 2 container (#60), so it is that stage's concern rather than this one. Verified on macOS arm64: full ctest 320/320.
…angeSum for it The RangeList tests added with the merge fix all used unsigned, but the reliability layer instantiates RangeList<DatagramSequenceNumberType>, and that is uint24_t -- a type that wraps at 0xFFFFFF. None of the existing cases exercised the arithmetic the shipping instantiation actually performs, and Insert() compares against minIndex-(range_type)1 and maxIndex+(range_type)1, which wrap at the extremes. Adding those tests turned up that RangeSum() never compiled for uint24_t at all. "uint24_t + int" is ambiguous between the type's operator uint32_t() conversion and its own operator+, and member functions of a template are only instantiated when used -- RangeSum() has no caller anywhere in Source/, so the broken line never reached a compiler. Fixed by widening explicitly rather than deleting the accessor, since the tests use it as their observable. Subtracting before widening is safe: maxIndex >= minIndex within a range by construction. Seven new cases covering merges away from the boundary, a gap closing directly below the wrap point, the fixed missed-merge expressed in the shipping type, serialization round-tripping the extremes, and a differential against a model inside a window. One of them records current behaviour rather than asserting a design: ranges are ordered by raw value, so 0 does not fuse with 0xFFFFFF even though they are adjacent as sequence numbers. Coverage stays correct across the wrap, which is what the ack path depends on, and that is what the test pins -- so a future change to make the ordering wrap-aware is a deliberate one. Verified on macOS arm64: 20 RangeList cases pass, full ctest green.
…WeightedHeap
Last container in the stage 1 migration. The outgoing packet buffer and the
per-channel ordering heaps were the only users left once the dead Tree,
WeightedGraph and OrderedChannelHeap headers went.
Source/include/mafianet/weighted_heap.h is a small minimum-first heap holding
std::push_heap/std::pop_heap over a std::vector, so the heap arithmetic is the
standard library's rather than ours. Not std::priority_queue: the reliability
layer reads the minimum's weight without popping it, and sweeps every element
by index when freeing on teardown and when scanning for stale split packets,
neither of which priority_queue exposes.
StartSeries()/PushSeries() are deliberately not reproduced. They appended
without sifting while the caller promised ascending weights, and measurement
of the one call site's pattern shows the promise bought nothing: at 64, 750
and 4000 fragments PushSeries was never faster than an ordinary Push and at
4000 was 12% slower. It also silently corrupts pop order if the promise is
ever broken, so it was risk without return. Both call sites now use Push.
Measured against the implementation it replaces, on long-lived heaps, which is
how the reliability layer holds them -- one per connection, reused:
steady state, 2M interleaved push+pop
depth 16 23.8ms -> 16.6ms 0.70x
depth 128 29.2ms -> 24.8ms 0.85x
depth 1024 36.4ms -> 28.7ms 0.79x
split-packet burst, push N ascending then drain
64 frags 2.0ms -> 1.9ms 0.92x
750 frags 28.3ms -> 26.1ms 0.92x
4000 frags 137.4ms -> 216.7ms 1.58x
So the path every message takes is 15-30% faster, bursts up to roughly a
megabyte are 8% faster, and the regression is confined to single messages of
several megabytes -- 4000 fragments is about 5.6MB at a 1400 byte MTU, where
72us of heap work per message sits behind the I/O and copying it takes to send
it. Taking that trade rather than keeping a hand-written heap.
A first pass measured 2.1x SLOWER and was wrong: it constructed and destroyed
a heap per repetition, so it was timing the allocator rather than the heap.
Tests/Unit/WeightedHeapTests.cpp is new -- the structure deciding the order
packets leave the send buffer had none. 9 cases, including a differential that
drives it and a std::multiset model through 20000 mixed pushes and pops and
checks every pop returns the lowest weight still held, plus the ascending-run
ordering that PushSeries used to be responsible for.
ds_heap.h is deleted. Remaining DataStructures:: matches for the stage 1
containers under Source/ are all commented-out code, except RangeList, which
stays by design.
Verified on macOS arm64: full ctest 335/335.
Segfaultd
changed the title
…ke cells Review finding on #71, and a regression I introduced. Moving the rows to std::map turned three call sites into rows[rowId] = newRow, which replaces the row already stored. That leaks it and leaves anything holding a pointer to it outside the table -- Room::tableRow in the Lobby2 rooms container comes straight from one of these overloads. The B+ tree Insert that preceded it refused duplicate keys, so the table was never modified in that case. It ignored the result here and returned a row it had not stored, which leaked the NEW row and handed the caller something the table did not contain. Both behaviours are wrong; the fix is neither. All three now use insert() and, on a duplicate, free the new row and return 0, matching the AddRow(unsigned) overload that already documented "Already exists" that way. Two tests added. Only AddRow(unsigned) was covered when the rows moved, which is exactly how this got through: the overloads taking initial cell values had no duplicate-id case at all. Checked that they bite -- restoring the overwriting version fails both. Verified on macOS arm64: full ctest 337/337, Table suite clean under ASAN, samples build including Lobby2 clean.
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Good catch — valid, and worse than the review states. Fixed in a9c4d7a. Both the before and after were wrong, in different ways:
All three sites now use Two tests added. Worth recording why this got through: when the rows moved to Re-verified: full ctest 337/337, Table suite clean under ASAN, samples build including Lobby2 clean. Pushing this re-ran CI; Linux Debug/Release in Docker were 335/335 before these two tests and I will re-run them on the final head before this merges. |
The three performance statements in this header were wrong. Re-measured, both as microbenchmarks and end to end through two ReliabilityLayer instances on a fake socket with simulated time, comparing 32c1a95 (DataStructures::Heap) against feab638 (this class) -- two commits that differ only in the heap. - "~1.8x slower pushes through a priority_queue of std::pair": false. A priority_queue of the same node measures the same as this class at every depth tried, and slightly faster on fragment bursts. The real reason not to use it is that it exposes neither the minimum's weight nor indexed access for the teardown sweep, both of which the reliability layer uses. - "StartSeries/PushSeries was never faster than an ordinary push and usually slower": false. It does fewer comparisons and measures up to ~35% faster in a microbenchmark of its call site's pattern. Removing it is still right, because it silently corrupts pop order if its ascending-weight precondition breaks, and its advantage does not survive to the end-to-end path -- but the justification was not the one given. - A 1.58x regression on a 4000-fragment burst, claimed on the PR: false. It was a microbenchmark artifact. End to end that case is 1.00x. What the end-to-end numbers actually show: 0.97-1.00x for deep backlogs and fragment bursts, and 1.07x for the lightest case (two small messages per tick). That last figure is a per-operation overhead of vector-backed storage at tiny queue depths which no implementation could remove -- std::push_heap, three hole-method variants, an explicit-count variant and std::priority_queue all measure the same, while the old List-backed heap is uniquely fast there. No code change; the implementation is unchanged and the claims now match measurement. Claude-Session: https://claude.ai/code/session_011kRj5nodTJrxyoHY7y6R6c
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Completes #59.
What changes
ds_tree.h,ds_weighted_graph.h,ds_ordered_channel_heap.h. No consumers.connection_graph2.hgains a directds_ordered_list.hinclude it had been getting transitively.Table::rows→std::map,ds_bplus_tree.hdeleted. API break on an installed header (GetRows()return type,GetListHead()removed), taken deliberately.std::mapiterates ascending by key exactly as the B+ tree leaf chain did, so query, sort and wire order are unchanged.std::list.DataStructures::Heap→WeightedHeapoverstd::vector.RangeList, and fixRangeSum()foruint24_t.RangeListitself stays — the issue permits "a small purpose-built type" and its merge semantics are why it exists; its internalOrderedListis stage 2 (#60).Multilistneeds no change:Source/has no live use, and the header is still used for real byLobby2/SteamandSQLite3Plugin.The bug
RangeListsits on the ack path of every datagram and owns a wire format, and had no tests. Written against the existing implementation first, three failed.Minimal case:
Insert(0), Insert(3), Insert(1)→[0,0] [1,1] [3,3]instead of[0,1] [3,3]. The insert branch compared the new value only against the range at the insertion point, never the one before it.No ack was ever lost —
IsWithinRangeandRangeSummatched astd::setmodel throughout. The cost is entries the list does not need, andSerialize()turns each one into ACK/NAK bytes. The trigger is ordinary: 0–5 arrive, 8 arrives early leaving a gap, then 6 starts a new entry instead of extending[0,5]. Ack lists fragment most on exactly the networks where ack size matters.Separately,
RangeSum()never compiled for the shippinguint24_ttype:uint24_t + intis ambiguous betweenoperator uint32_t()and its ownoperator+, and template members instantiate lazily — with no caller inSource/, the broken line never reached a compiler.Heap
WeightedHeapkeepsstd::push_heap/std::pop_heapover astd::vector. Notstd::priority_queue, for interface reasons only: the reliability layer reads the minimum's weight without popping it and sweeps every element by index at teardown, andpriority_queueexposes neither.StartSeries()/PushSeries()are dropped as unsound — pop order corrupts silently if the caller's ascending-weight promise is ever broken.No performance change on the shipping path. A/B of
32c1a957againstfeab638b(differing only in the heap), end to end through twoReliabilityLayerinstances over a fake socket with simulated time, Release, best of 25 interleaved runs: fragment bursts up to ~4000 fragments and deep backlogs come out 0.97–1.00×; the lightest case (2 msgs/tick) is 1.07×. That residue is ~4 ns per push+pop at queue depth ≤16 and is intrinsic to vector-backed storage, not to this implementation —std::push_heap, three hole-method variants, an explicit-count variant andstd::priority_queueall measure the same.The issue's scope table
Four of six rows are wrong.
BPlusTree,LinkedListandMultilistare each listed withreliability_layer/udp_proxy_*consumers that are entirely commented-out code, and Huffman is listed as deletable while live instring_compressor,data_compressor,file_list_transferandpeer.cpp— only its factory is dead.The issue also scopes
Tableout of every stage while requiring that noDataStructures::use of the listed containers remain. Both cannot hold: Table owned the rows and returned the tree from a public getter. Resolved by migrating Table.Tests
Four structures on hot or protocol-bearing paths had no coverage at all. Each suite was written against the pre-migration implementation and checked to actually bite:
TableTestsAddRowsites fails 3RangeListTestsstd::setdifferentials under random and ack-like arrival, plus golden serialized bytesWeightedHeapTestsstd::multisetdifferential across 20 000 mixed pushes and popsHuffmanEncodingTests<→<=) fails 3 while the round-trip case still passes — which is why they are golden bytesNo existing test was modified, disabled or removed: the four suites above are new files and the only
Tests/change on the branch (+1236, −0).ctestdiscovers 285 tests at the base and 337 here, with an empty base-minus-head set — every pre-existing test still runs. Mutation figures above were re-measured on heade716df5c; reverting theRangeSumuint24_tfix does not even compile, because the new wrapping-type suite forces the instantiation that previously had no caller.Verification, on head
e716df5cctestDebug and Release both run per CLAUDE.md, since the reliability layer is touched.
Not touched: a stale
Samples/iOS/ChatClient.xcodeprojlists the deleted headers (unmaintained project file, platform MafiaNet does not target), and the commented-out blocks inreliability_layer.cppthat misled the scope table — removing those is diff noise in a performance-sensitive file, better done separately.Summary by CodeRabbit