[AIT-255] Fix events emitted upon sync #111

lawrence-forooghian · 2026-01-16T11:09:33Z

This implements the spec changes from ably/specification#414 at 3f86319. That is, the update events emitted by a sync are now calculated from the before/after diff of the object state, as opposed to just being calculated from the createOp.

Summary by CodeRabbit

New Features
- Replace operations now emit precise change deltas: counters report exact amount changed; maps report which keys were added, removed, or updated.
Tests
- Added and expanded unit tests validating diff calculations and updated expectations across replace and sync scenarios.

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coderabbitai · 2026-01-16T11:09:45Z

Walkthrough

The PR changes replaceData flows in LiveCounter and LiveMap to capture previous data, update state, and return calculated diffs (counter or map). It adds ObjectDiffHelpers for diff computation and updates/extends unit and integration tests to validate diff outputs (RTLC6h / RTLM6h).

Changes

Cohort / File(s)	Summary
Core diff computation `Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift`	New internal enum with `calculateCounterDiff(previousData:newData)` and `calculateMapDiff(previousData:newData)` returning `LiveObjectUpdate` diffs (counter delta; map removals/adds/updates; skips tombstoned entries where appropriate).
LiveCounter implementation `Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift`	In `replaceData`, store `previousData` before mutating, ignore `mergeInitialValue` return when `createOp` exists, and return a counter diff via `ObjectDiffHelpers.calculateCounterDiff`.
LiveMap implementation `Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift`	In `nosync_replaceData`, store `previousData` before state changes, ignore `mergeInitialValue` return when `createOp` exists, and return a map diff via `ObjectDiffHelpers.calculateMapDiff`.
Counter diff tests `Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift`	Adds `DiffCalculationTests` verifying RTLC6h diff amount correctness with and without `createOp` (note: block duplicated in two test contexts).
Map diff tests `Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift`	Adds `DiffCalculationTests` under `ReplaceDataTests` validating RTLM6h diff outputs for adds, removes, and updates, including cases with `createOp`.
Diff helper unit tests `Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift`	Extensive unit tests for `calculateCounterDiff` and `calculateMapDiff` covering removals, additions, updates, tombstoned-entry scenarios, and multiple transition cases.
Integration test updates `Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift`	Adjusts assertions to validate per-diff emissions (individual map key statuses and counter `amount`) instead of prior merge-return expectations.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 I stored "before" in my little paw,

then watched the "after" hop in with a gnaw,
I tally the change and map every key,
a whiskered cheer for diffs that set data free,
tiny rabbit, big updates—hip hooray!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'AIT-255 Fix events emitted upon sync' is directly related to the main objective of fixing events emitted during sync operations for LiveObjects, matching the linked issue AIT-255.
Linked Issues check	✅ Passed	The PR implementation fully addresses the AIT-255 objectives: it captures previous state, calculates diffs before/after replacement, emits diff-based updates, and aligns Swift behavior with JS and the spec.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to fixing events emitted upon sync; no unrelated modifications detected outside the diff calculation and event emission requirements.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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Commit unit tests in branch AIT-255-fix-replace-data-events

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📒 Files selected for processing (7)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift
Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift
Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift

🚧 Files skipped from review as they are similar to previous changes (3)

Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift
Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift

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Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift

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Add comments in tests to clarify when certain test data is irrelevant to the scenario
In tests, import Ably using import Ably
In tests, import AblyLiveObjects using @testable import AblyLiveObjects
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Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift

Sources/AblyLiveObjects/**/*.swift

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Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift

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Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift

🧬 Code graph analysis (3)

Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift (4)

Tests/AblyLiveObjectsTests/Helpers/Subscriber.swift (1)

getInvocations (23-33)

Sources/AblyLiveObjects/Utility/ExtendedJSONValue.swift (1)

map (71-92)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (1)

entries (143-150)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

value (100-104)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (2)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (1)

mergeInitialValue (516-574)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (1)

calculateCounterDiff (11-17)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (2)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

mergeInitialValue (354-371)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (1)

calculateMapDiff (25-56)

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🔇 Additional comments (6)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (1)

471-512: LGTM! Diff-based update implementation is correct.

The changes correctly implement RTLM6g/RTLM6h:

previousData is captured at the right point—after tombstone handling but before data mutation

mergeInitialValue result is appropriately discarded since the diff is computed separately

The diff is calculated between previousData and the final data state (post-merge)

This aligns with the counter implementation pattern and the PR objective of emitting diffs representing the full before-and-after state change.

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

334-350: LGTM! Consistent diff-based update implementation.

The changes correctly implement RTLC6g/RTLC6h with the same pattern as the map implementation:

previousData captured before state mutation

mergeInitialValue result discarded in favor of computed diff

Diff returned via ObjectDiffHelpers.calculateCounterDiff

The implementation correctly produces the full before-and-after diff (e.g., 0 → 15 yields amount=15).

Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift (3)

122-126: LGTM! Test correctly validates diff-based map updates.

The test properly verifies RTLM6h semantics—the emitted update reflects the diff from empty state to final state containing both key1 (from entries) and createOpKey (from createOp), both marked as .updated.

163-165: LGTM! Test correctly validates diff-based counter updates.

The test properly verifies RTLC6h semantics—the diff from 0 (initial zero-valued counter) to 15 (10 from state + 5 from createOp) is correctly expected as amount: 15.

374-387: LGTM! Complex scenario test validates diff semantics correctly.

Both map and counter diff validations in this comprehensive test align with the RTLM6h/RTLC6h specifications, verifying the full before-and-after diff behavior for existing objects during sync.

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (1)

1-57: LGTM! Clean implementation of diff calculation helpers.

The implementation correctly follows the spec:

calculateCounterDiff (RTLC14b): Simple subtraction produces the delta

calculateMapDiff (RTLM22b): Properly handles removed/added/changed keys using set operations on non-tombstoned entries

The force unwraps on lines 47-48 are safe since the keys are guaranteed to exist in both dictionaries (they come from the intersection of both key sets).

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coderabbitai

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift`:
- Around line 1-4: Replace the unused Foundation import at the top of the file
with the required module imports: remove "import Foundation" and add "internal
import _AblyPluginSupportPrivate" and "import Ably" so the file follows the
AblyLiveObjects coding guidelines; update the header above the internal enum
ObjectDiffHelpers accordingly.

🧹 Nitpick comments (1)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (1)
96-109: Consider simplifying using Optional's built-in equality.

Since JSONObjectOrArray conforms to Equatable, the entire function can be simplified to a single expression, as Swift's Optional automatically provides == when the wrapped type is Equatable.
♻️ Simplified implementation
     private static func areJSONEqual(
         _ json1: JSONObjectOrArray?,
         _ json2: JSONObjectOrArray?
     ) -> Bool {
-        switch (json1, json2) {
-        case (nil, nil):
-            return true
-        case (nil, .some), (.some, nil):
-            return false
-        case let (.some(j1), .some(j2)):
-            // JSONObjectOrArray conforms to Equatable, so we can use == directly
-            return j1 == j2
-        }
+        json1 == json2
     }

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📒 Files selected for processing (7)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift
Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift
Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift

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**/*.swift

📄 CodeRabbit inference engine (.cursor/rules/swift.mdc)

**/*.swift: Specify an explicit access control level (SwiftLint explicit_acl) for all declarations in Swift code (tests are exempt)
When extending a type, put the access level on the extension declaration rather than on each member (tests are exempt)
Prefer implicit .init(...) when the type can be inferred in initializer expressions
Prefer enum case shorthand (.caseName) when the type can be inferred
For JSONValue or WireValue, prefer using literal syntax via ExpressibleBy*Literal where possible
Prefer Swift raw string literals for JSON strings instead of escaping double quotes
When an array literal begins with an initializer expression, place the initializer on the line after the opening bracket

Files:

Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift
Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift

Tests/**/*.swift

📄 CodeRabbit inference engine (.cursor/rules/testing.mdc)

Tests/**/*.swift: Use the Swift Testing framework (import Testing), not XCTest, in test files
Do not use fatalError for expectation failures; prefer Swift Testing’s #require
Only add labels to test cases or suites when the label differs from the suite struct or test method name
Tag tests per CONTRIBUTING.md’s "Attributing tests to a spec point" with exact comment format; distinguish @spec vs @specPartial; do not repeat @spec for the same spec point
Add comments in tests to clarify when certain test data is irrelevant to the scenario
In tests, import Ably using import Ably
In tests, import AblyLiveObjects using @testable import AblyLiveObjects
In tests, import _AblyPluginSupportPrivate using import _AblyPluginSupportPrivate (do not use internal import)
When passing a logger to internal components in tests, use TestLogger()
When unwrapping optionals in tests, prefer #require over guard let

Files:

Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift
Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift
Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift

Sources/AblyLiveObjects/**/*.swift

📄 CodeRabbit inference engine (.cursor/rules/swift.mdc)

In AblyLiveObjects library (non-test) code, import modules as: Ably with import Ably, and _AblyPluginSupportPrivate with internal import _AblyPluginSupportPrivate

Files:

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift

Sources/**/*.swift

📄 CodeRabbit inference engine (.cursor/rules/testing.mdc)

For testsOnly_ property declarations, do not add generic explanatory comments (their meaning is understood)

Files:

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift
Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift
Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift

🧬 Code graph analysis (6)

Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift (2)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (2)

calculateCounterDiff (11-17)

calculateMapDiff (25-62)

Tests/AblyLiveObjectsTests/Helpers/TestFactories.swift (1)

internalMapEntry (408-418)

Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift (4)

Tests/AblyLiveObjectsTests/Helpers/Subscriber.swift (1)

getInvocations (23-33)

Sources/AblyLiveObjects/Utility/ExtendedJSONValue.swift (1)

map (71-92)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (1)

entries (143-150)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

value (100-104)

Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift (1)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (3)

createZeroValued (66-81)

nosync_replaceData (203-216)

value (100-104)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (1)

calculateCounterDiff (11-17)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (2)

Sources/AblyLiveObjects/Internal/InternalLiveObject.swift (1)

tombstone (17-41)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (1)

keys (152-155)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (2)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

mergeInitialValue (354-371)

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (1)

calculateMapDiff (25-62)

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🔇 Additional comments (11)

Sources/AblyLiveObjects/Internal/InternalDefaultLiveCounter.swift (1)

334-351: Diff-based update path looks correct.

Storing previousData before mutation and returning the calculated diff ensures a single full delta for replaceData.

Tests/AblyLiveObjectsTests/InternalDefaultLiveMapTests.swift (1)

296-486: DiffCalculationTests provide solid RTLM6h coverage.

The scenarios exercise expected diffs for createOp merges, tombstones, and unchanged entries.

Tests/AblyLiveObjectsTests/ObjectsPoolTests.swift (3)

121-127: Map diff emission assertions align with RTLM6h.

These checks correctly validate the full-diff update for existing maps.

163-166: Counter diff emission expectation matches RTLC6h.

The assertion correctly validates the single diff update.

374-388: Complex sync scenario diff assertions look correct.

The emitted updates now reflect the full before/after deltas as intended.

Tests/AblyLiveObjectsTests/InternalDefaultLiveCounterTests.swift (1)

153-233: RTLC6h diff tests are well covered.

Positive, negative, and createOp-merged deltas are exercised cleanly.

Sources/AblyLiveObjects/Internal/InternalDefaultLiveMap.swift (1)

471-512: LGTM! Clean implementation of RTLM6g/RTLM6h spec changes.

The implementation correctly:

Captures previousData before any data mutations (RTLM6g)

Discards the LiveMapUpdate from mergeInitialValue when createOp is present (RTLM6d)

Returns a unified diff computed via ObjectDiffHelpers.calculateMapDiff (RTLM6h)

This ensures a single event representing the full before-and-after state change during sync, matching the behavioral change described in the PR objectives.

Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift (4)

11-17: LGTM!

Simple and correct implementation of RTLC14b - the diff amount is computed as newData - previousData.

66-72: LGTM!

Correctly compares only the data field for diff purposes, ignoring metadata fields (timeserial, tombstonedAt) as documented.

75-93: LGTM!

Comprehensive nil handling and field-by-field comparison. The comparison covers all ObjectData fields appropriately.

25-62: The current implementation is correct. The tests explicitly expect calculateMapDiff to return .update(DefaultLiveMapUpdate(update: [:])) even when there are no changes—not .noop. The test assertion #expect(update.update?.update.isEmpty == true) confirms this: it expects the .update case with an empty dictionary, which would fail if .noop were returned instead. This behavior is intentional and consistent with calculateCounterDiff, which also always returns .update regardless of whether the diff amount is zero.

Likely an incorrect or invalid review comment.

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Sources/AblyLiveObjects/Internal/ObjectDiffHelpers.swift

Tests/AblyLiveObjectsTests/ObjectDiffHelpersTests.swift

This implements the spec changes from [1] at 3f86319. That is, the update events emitted by a sync are now calculated from the before/after diff of the object state, as opposed to just being calculated from the createOp. Written by Claude based on the spec. [1] ably/specification#414

maratal

LGTM

lawrence-forooghian marked this pull request as draft January 16, 2026 11:09

github-actions bot temporarily deployed to staging/pull/111/AblyLiveObjects January 16, 2026 11:10 Inactive

coderabbitai bot reviewed Jan 16, 2026

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