STF-1412: Add insertion metadata to inserters - #251
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe inserter API now supports pure and metadata-aware callbacks. Tree insertion propagates network and record metadata, supports resolver-based direct and range insertion, handles partial failures, and centralizes address conversion. Tests and benchmarks cover metadata, memoization, retries, loading, and overlay equivalence. ChangesMetadata-aware insertion
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The change adds insertion metadata and separate pure callback paths while preserving existing behavior, but wide overlays can incur repeated CPU work from per-record invariant recomputation without changing results. This bounded performance risk is mergeable with explicit owner awareness or follow-up. Sequence Diagram(s)sequenceDiagram
participant Tree
participant Node
participant InserterFunc
Tree->>Node: insert record or subnet
Node->>Node: construct inserter.Metadata
Node->>InserterFunc: pass existing value, new value, metadata
InserterFunc-->>Node: return value or error
Node->>Node: merge children after insertion errors
Node-->>Tree: return updated tree or joined error
Poem
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Inline comments:
In `@inserter/metadata_test.go`:
- Around line 81-103: Add table-driven cases alongside the existing Metadata
cases for the IPv4-in-IPv6-tree path with ExistingDepth below 96, asserting that
expectedExistingNetwork is an IPv6 prefix, and for negative ExistingDepth,
asserting the documented guard behavior. Keep these additions focused on
ExistingNetwork’s branch coverage and use the existing test symbols and
assertion structure.
In `@metadata_test.go`:
- Around line 901-926: Guard the address-count calculation in
metadataOracleRecords against a /0 prefix so the oracle does not overflow the
uint32 shift and produce zero records; handle the full IPv4 range explicitly
while preserving existing behavior for narrower prefixes. Apply the same
protection to the corresponding shift in nextPrefixAddr.
- Around line 928-934: Update ipv4Uint32 to convert address.As4() using
binary.BigEndian.Uint32 instead of the manual byte-shift chain, matching the
existing ipv4Addr implementation and eliminating the narrowing-conversion
warnings.
- Around line 780-783: Rename the local provenanceValue variables in both
affected subtests to avoid shadowing the package-level provenanceValue helper,
and update their corresponding assertions to use the new names.
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CHANGELOG.mdaudit_test.goerrors.goinserter/inserter.goinserter/inserter_test.goinserter/metadata_test.gointernal/treeaddr/treeaddr.gometadata_test.gonode.gotree.gotree_benchmark_test.gotree_test.go
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Inline comments:
In `@node.go`:
- Around line 120-141: Compute the inserted network once in insertPrepared after
insertedAs4 is established, declaring err before assigning the
PrefixFromInsertIP result and storing it on the reused insertRecord. Refresh
that field for every prepared subnet so insertRange cannot retain prior-subnet
metadata, then have resolve reuse the stored value instead of calling
PrefixFromInsertIP; account for the added netip.Prefix field in insertRecord’s
layout.
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CHANGELOG.mdinserter/inserter.goinserter/metadata_test.gometadata_test.gonode.gotree.go
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Inline comments:
In `@inserter/inserter.go`:
- Around line 82-116: Extract the shared InsertedNetwork, TreeDepth, and 32-bit
address-family validation into a helper, then reuse it in both
Metadata.InsertedDepth and Metadata.ExistingNetwork. Preserve each method’s
existing handling for its additional depth-specific validation and
invalid-result behavior.
In `@metadata_test.go`:
- Around line 304-312: Extract a captureMetadataKeepExisting helper that accepts
a pointer to the metadataCall slice, records existingValue and metadata, and
returns existingValue unchanged. Replace the four identical keep-existing
closures at the referenced InsertFunc call sites with this helper, while leaving
the existing captureMetadata behavior unchanged.
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CHANGELOG.mdinserter/inserter.gointernal/treeaddr/treeaddr.gometadata_test.gonode.gotree.go
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Pull request overview
Adds metadata-aware insertion callbacks while separating memoizable pure inserters from metadata-dependent inserters.
Changes:
- Introduces
inserter.Metadata,PureFunc, and metadata-aware insertion APIs. - Preserves logical record boundaries after failed callbacks and centralizes tree-address conversion.
- Adds extensive correctness, fuzz, audit, and performance coverage.
Reviewed changes
Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
CHANGELOG.md |
Documents callback and metadata API changes. |
audit_test.go |
Updates audit tests for metadata callbacks. |
errors.go |
Reuses shared tree-address conversion. |
inserter/inserter.go |
Defines metadata and callback types. |
inserter/metadata_test.go |
Tests metadata helper methods. |
internal/treeaddr/treeaddr.go |
Adds shared address-to-prefix conversion. |
metadata_test.go |
Covers metadata semantics and failure behavior. |
node.go |
Implements metadata resolution and error unwinding. |
tree.go |
Integrates pure and metadata-aware insertion paths. |
tree_benchmark_test.go |
Benchmarks metadata overlay workflows. |
tree_test.go |
Updates insertion tests for new APIs. |
value_store_test.go |
Adapts memo ownership testing. |
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horgh
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LGTM. I ran a Claude review with the review-pr skill and it had some feedback.
An insert covering records more specific than itself handed every callback the zero Prefix for ExistingNetwork, so a /31 inserted over an existing 1.1.1.1/32 could not tell its two covered records apart. Only the depth was available. insertNode now writes the branch it takes into iRec.ip once the walk is deeper than prefixLen. Navigation does not read those bits there, so they can carry the descent path metadata needs. Nothing restores them: maskedTreeAddr drops every bit past the record's own depth, PrefixFromInsertIP masks at prefixLen, and insertPrepared overwrites ip for the next subnet of a range. ExistingNetwork therefore no longer returns the zero Prefix for a record more specific than the insert, and the Tree.Get oracle in metadata_test.go asserts every record instead of skipping the deeper ones. BenchmarkTreeInsertDeepMergeFragmentedNetwork, a /20 insert descending over 4096 /32 records, measures 229.1us +/- 11% before and 230.2us +/- 6% after (p=0.887, n=7+10), with identical allocations. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
TestFailedInsertsPassTheAudit is the only failure suite that runs with RefcountAudit set, and it did not cover two of the paths where a future ownership mistake would leak references quietly: a callback that fails on the first of two in-network children, and a callback that fails over an empty record wider than the insert, where success would have created a path record. Each row asserts the shape it claims to cover, so a change that stops reaching the path fails instead of passing silently. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The four existing seeds reach only shallow shapes, and CI runs no -fuzz step, so the seeds are the whole corpus in practice. That matters because this target derives its expectations from Tree.Get rather than from the implementation, which makes it the strongest assertion in the file. The three added seeds cover a split chain whose existing depth falls between record boundaries, an error on the first of several covered records, and a split chain that descends seven levels. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Two consequences were understated. "Internal representation and arena allocation are not restored" reads as cosmetic, but splitting a record to reach the inserted network allocates nodes that the unwinding merge does not reclaim: 1000 failed /24 inserts over a /8 record allocate 16000 nodes, 16 per failure, while lookups stay correct and the refcount audit stays clean. Coalescing is also not limited to values. maybeMergeChildren merges empty and reserved siblings too, so a callback that removes a value and then fails can widen an empty record, changing which prefix Tree.Get reports for a miss even though no value changed. mergeChildrenAfterError now names its error, so a log reader can tell a failure to restore the record boundaries from the insert failure that triggered it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Four gaps. InsertedNetwork is the normalized prefix, so a caller comparing it against the prefix they passed can be surprised: ::ffff:1.2.3.4/120 arrives as 1.2.3.0/24. Metadata is not comparable, which godoc hid entirely, since the blank field that enforces it renders as "contains filtered or unexported fields". The IPv6-form result of ExistingNetwork needs DisableIPv4Aliasing to be reachable at all, because aliasing splits the path down to depth 96 and an IPv4 insert into a default IPv6 tree resolves at depth 97 or deeper. And an insertion containing a reserved or aliased network skips it silently, so a callback cannot treat its calls as covering the whole inserted network. The reserved-record comment also claimed the insert removes the record. It leaves it in place. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The split-chain rationale sat at the top of insertNode, which never touches splitDepth. It belongs on the field, next to the assignment and the read it justifies. It also said "above" and "below" prefixLen, which invites the reading that a deeper record is "below" a prefix length when the argument turns on the opposite direction, so it now says shallower and deeper. Two invariants were unwritten: the empty-record branch reports newDepth with no splitDepth check, which is correct only because a split chain never descends into an empty record, and insertResolver is a sum type whose both-non-nil state would silently ignore withMetadata. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Its only caller always passes recordTypeData, tree.inserter, and noNodeIndex. Only the inserter varies by caller, so the other two move into the body. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
writeBenchmarkSource and two other benchmarks each re-implemented writeTempDB, because that helper took *testing.T. Widening it to testing.TB needs no change at its seven existing call sites and removes all three copies. ipv4Addr moves to tree_benchmark_test.go, where all of its callers are. TestInserterMetadataNarrowerRecordNetworkFallback asserted the same three things as the narrower existing records subtest, differing only in using four /26s instead of three records of mixed depth, so the subtest covers it. One assertion in the exact existing record subtest compared two values that both came from the code under test, with the arguments reversed, and the line after it already pins both against literals. TestMemoPinsItsKeys built an insertRecord with no resolver, a shape no insert path produces. It now carries the pure inserter that makes the memo live. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The FuncGenerator removal was filed under the rename bullet with no pointer, although it was the network-aware inserter API and inserter.Func replaces it. The entry now says what to call instead and which metadata field stands in for the network the generator closed over. It also names Metadata's fields, and lists the four methods that reject a nil function instead of calling them "an explicit insert method", a term the package does not define. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
IANA now redirects both registry URLs to paths without the .xhtml suffix, and lychee.toml sets max_redirects to 0 so that moved links surface instead of passing quietly. This is what turned linkChecker red on every branch. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Three gaps, each found by mutating the code and watching the suite stay green. maskedTreeAddr's partial-byte mask had no effective coverage: changing its shift from 8 to 7 dropped a bit from every non-aligned ExistingAddr and nothing noticed, because the raw assertions were all byte-aligned or all-zero, and every other path went through ExistingNetwork, whose Prefix call re-masks. A /27 inserted over a /25 record now pins the raw address at a depth that ends mid-byte. ExistingNetwork's >= 96 boundary was untested, so > 96 also passed. Depth 96 is the IPv4 subtree root and the hinge of the follow-the-insert family rule, so the table now carries that row. internal/treeaddr had no direct tests, although it is the one conversion both the error and metadata paths use. Its table pins the family decision, the identical bytes that decode as either family, and the two prefix lengths that make Addr.Prefix fail. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The restoration guarantee, that a failure before any result is installed leaves values, record boundaries, and lookups unchanged, was only tested over a /23 base with a /24 insert, which is a single split. It is most fragile over a deep chain, where the unwinding merge has to fire at every frame. A /32 inside a /8 record splits 24 levels, and the test now asserts byte-identical output and a clean value store audit after that insert fails. Range failures were untested past the first subnet, because 1.2.3.0-1.2.3.255 decomposes to exactly one /24, so the range row exercised the same single-subnet path as the prefix row above it. A four-subnet range failing on the third subnet covers the rest: two subnets stay installed, the failing one and the untouched one keep the base value, and the reported depths track the fragmentation each subnet leaves for the next. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
It was assigned only when the resolver takes metadata, so on every other path it kept whatever an earlier insert left there. Nothing reads it on those paths today, which made the hole invisible, and the struct comment claimed an unconditional invariant the code did not maintain. Assigning it always costs one netip.Addr.Is4 call per insert, and it is a prerequisite for ENG-5302, which needs a trustworthy family at the reserved and aliased error sites. ExistingNetwork's address family expression also carried a dead TreeDepth == 32 term, since treeaddr.PrefixFromInsertIP returns from its own 32-bit tree branch before it reads as4. InsertedDepth's doc now says that the 0 it returns for an inconsistent Metadata is also the depth of a root insert. BenchmarkTreeInsertOverlappingPasses stays at 1,034,38x B/op and insertRecord stays 120 bytes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Every other API change in this release is a compile error, so a user finds out. This one is not: Options.Inserter keeps v1's two-argument shape, so an existing inserter still compiles while its calls are now memoized, running once per distinct existing value instead of once per covered record. An inserter that counts calls, allocates identifiers, or reads mutable state changes behavior silently, and InsertFunc or InsertRangeFunc is where it belongs. The memo claim also needed a qualifier. Tree.InsertRange only shares a memo when Options.Inserter is set, since the default nil inserter takes the direct-value path. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
horgh
approved these changes
Aug 21, 2026
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Summary
inserter.Metadatafor explicitTree.InsertFuncandTree.InsertRangeFunccallbacks, including normalized insertion and currentrecord-shape information
inserter.PureFuncforOptions.Inserter, thedefault insert/range/load paths, the pure insert methods, and all built-in
inserters; repeated value pairs may be memoized without exposing metadata
installing a result, and share tree-address decoding in
internal/treeaddrdifferential, memoization, and oracle-fuzz coverage
Performance
nine-benchmark comparison against
mainhad a 0.34% faster geomeanand performed 31.84% fewer allocations than sort-plus-provenance-plus-strip
(
p < 0.001, 10 samples)overlay, and metadata overlays found unchanged allocation counts and no
significant timing changes after splitting the callback types
change
Testing
go test ./...go test -race ./...go vet ./...GOARCH=386 go test ./...MMDBWRITER_REFCOUNT_AUDIT=1 go test ./...go test -run='^$' -fuzz='^FuzzInserterMetadata$' -fuzztime=30s .benchstatcomparison with 10 samples per revision, plus atargeted five-sample before/after comparison for the callback-type split
Summary by CodeRabbit
New Features
Improvements
Breaking Changes