Add lookupZones, fetchRecordChanges, and uploadAssets operations

[leogdion]

…, #46, #30)

Implement three CloudKit Web Services operations to improve API coverage from 35% to 53% (9/17 operations):

• lookupZones(): Batch zone lookup by ID with validation
• fetchRecordChanges(): Incremental sync with pagination support (manual and automatic)
• uploadAssets(): Binary asset uploads with multipart/form-data encoding

New public types:

• ZoneID: Zone identifier (zoneName, ownerName)
• RecordChangesResult: Change result with syncToken and moreComing flag
• AssetUploadToken/AssetUploadResult: Upload tokens for record association

MistDemo integration tests:

• Add --test-lookup-zones flag for zone lookup demonstrations
• Add --test-fetch-changes flag with --fetch-all and --sync-token support
• Add --test-upload-asset flag with optional --create-record association

Created GitHub issues for future enhancements:

• Enhancement: Add AsyncSequence wrapper for fetchRecordChanges streaming #200: AsyncSequence wrapper for fetchRecordChanges streaming
• Enhancement: Support batch asset upload (multiple files) #201: Batch asset upload support (multiple files)
• Enhancement: Add progress tracking for large asset uploads #202: Upload progress tracking for large files
• Enhancement: Implement automatic retry logic for expired tokens #203: Automatic token retry logic for expired tokens

All operations follow MistKit patterns: async/await, typed errors, proper logging, and comprehensive error handling.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 317 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.67%. Comparing base (df7836e) to head (1badf6d).

Files with missing lines	Patch %	Lines
...s/MistKit/Service/CloudKitService+Operations.swift	0.00%	115 Missing ⚠️
...tKit/Service/CloudKitService+WriteOperations.swift	0.00%	56 Missing ⚠️
...es/MistKit/Service/CloudKitResponseProcessor.swift	0.00%	39 Missing ⚠️
...Service/Operations.fetchRecordChanges.Output.swift	0.00%	24 Missing ⚠️
Sources/MistKit/Service/CloudKitService.swift	0.00%	21 Missing ⚠️
...istKit/Service/Operations.lookupZones.Output.swift	0.00%	17 Missing ⚠️
...stKit/Service/Operations.uploadAssets.Output.swift	0.00%	17 Missing ⚠️
Sources/MistKit/Service/AssetUploadToken.swift	0.00%	12 Missing ⚠️
Sources/MistKit/Service/RecordChangesResult.swift	0.00%	8 Missing ⚠️
Sources/MistKit/Service/ZoneID.swift	0.00%	8 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           v1.0.0-alpha.4     #204      +/-   ##
==================================================
- Coverage           14.31%   13.67%   -0.65%     
==================================================
  Files                  67       73       +6     
  Lines                7179     7496     +317     
==================================================
- Hits                 1028     1025       -3     
- Misses               6151     6471     +320     

Flag	Coverage Δ
spm	13.67% <0.00%> (-0.65%)	⬇️
swift-6.1-jammy	13.67% <0.00%> (-0.61%)	⬇️
swift-6.1-noble	13.67% <0.00%> (-0.61%)	⬇️
swift-6.2-jammy	13.67% <0.00%> (-0.61%)	⬇️
swift-6.2-noble	13.67% <0.00%> (-0.61%)	⬇️
swift-6.3-jammynightly	13.67% <0.00%> (-0.61%)	⬇️
swift-6.3-noblenightly	13.67% <0.00%> (-0.61%)	⬇️

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[claude]

Code Review: Add lookupZones, fetchRecordChanges, and uploadAssets operations

Summary

This PR adds three important CloudKit Web Services operations, improving API coverage from 35% to 53%. The implementation is well-structured and follows MistKit patterns consistently. Great work overall! 🎉

✅ Strengths

Code Quality

• Excellent documentation: All public APIs have comprehensive DocC-style comments with clear examples
• Consistent patterns: Follows established MistKit conventions (async/await, typed errors, logging)
• Type safety: Good use of Swift's type system with Sendable, Equatable, and Hashable conformance
• Error handling: Comprehensive error handling with proper CloudKitError mapping
• Clean separation: New types in dedicated files following single-responsibility principle

Architecture

• Protocol-oriented design: CloudKitResponseType conformance for all operation outputs
• Proper abstraction: Clean separation between public API and internal OpenAPI integration
• Sendable compliance: All types are properly marked as Sendable for concurrency safety
• Validation: Input validation (empty arrays, size limits) at API boundaries

Demo Integration

• Excellent UX: Well-designed CLI flags with clear help text
• Practical examples: Demonstrates real-world usage patterns
• Good user feedback: Clear output with emojis and formatting

🔍 Issues & Concerns

Critical: Missing Test Coverage ⚠️

This is the most significant issue. No unit tests were found for the three new operations:

• No tests for lookupZones()
• No tests for fetchRecordChanges() / fetchAllRecordChanges()
• No tests for uploadAssets()

Impact: Without tests, we cannot verify:

• Correct handling of success responses
• Proper error mapping (400, 401, 403, etc.)
• Validation logic (empty arrays, size limits)
• Response parsing (especially edge cases like empty tokens, missing fields)
• Pagination logic in fetchAllRecordChanges()

Recommendation: Add comprehensive unit tests following the pattern established in Tests/MistKitTests/Service/CloudKitServiceQueryTests.swift:

@Test("lookupZones returns zones successfully")
func testLookupZonesSuccess() async throws {
    // Mock URLSession with expected response
    // Verify correct zones returned
}

@Test("lookupZones handles empty zoneIDs")
func testLookupZonesEmptyValidation() async throws {
    // Verify throws proper error for empty array
}

@Test("fetchAllRecordChanges handles pagination")
func testFetchAllRecordChangesMultiplePages() async throws {
    // Mock multiple pages with moreComing flags
    // Verify all records accumulated correctly
}

Medium: Potential Memory Issues

Location: CloudKitService+Operations.swift:425-449

public func fetchAllRecordChanges(...) async throws -> (records: [RecordInfo], syncToken: String?) {
    var allRecords: [RecordInfo] = []
    // ...
    while moreComing {
        let result = try await fetchRecordChanges(...)
        allRecords.append(contentsOf: result.records) // ⚠️ Unbounded accumulation
    }
}

Issue: The method accumulates all records in memory, which could cause problems for zones with thousands of changes.

Recommendation: The documentation warning is good, but consider:

1. Adding a maxRecords parameter to cap total accumulation
2. Creating GitHub issue Enhancement: Add AsyncSequence wrapper for fetchRecordChanges streaming #200 (AsyncSequence wrapper) should be prioritized
3. Consider making this method internal until the streaming solution exists

Low: API Design Considerations

1. Asset Upload Size Validation

Location: CloudKitService+WriteOperations.swift:197

let maxSize: Int = 250 * 1024 * 1024 // 250 MB

Observation: The 250 MB limit is hardcoded. CloudKit's actual limits might vary by account type or change over time.

Suggestion: Consider making this configurable or moving to a central constants file:

public enum CloudKitLimits {
    public static let maxAssetSize: Int = 250 * 1024 * 1024
}

2. Empty Data Validation Order

Location: CloudKitService+WriteOperations.swift:206-212

guard !data.isEmpty else {
    throw CloudKitError.httpErrorWithRawResponse(...)
}

Minor: Empty data check happens after size check. While both are correct, checking isEmpty first would be more efficient (O(1) vs reading data.count).

3. ZoneID Default Owner Name

Location: ZoneID.swift:46

The distinction between nil (current user) and an explicit owner name is clear in docs, but could benefit from a convenience property:

public var isCurrentUser: Bool { ownerName == nil }

Low: Documentation Improvements

1. Missing Usage Example in AssetUploadToken

The AssetUploadResult type is well-documented, but AssetUploadToken could use a standalone example showing how tokens are used in record association.

2. Sync Token Lifecycle

The fetchRecordChanges documentation is excellent, but could mention:

• How long sync tokens remain valid
• What happens if a token expires
• Whether tokens are database-specific or zone-specific

🔒 Security Review

✅ No security concerns identified

• Proper token masking in logs via MistKitLogger
• No sensitive data exposed in error messages
• File size validation prevents DoS via large uploads
• Input validation on all user-provided parameters

⚡ Performance Considerations

Asset Upload

The current implementation loads the entire file into memory:

let data = try Data(contentsOf: fileURL)

For large files (approaching 250 MB), consider:

1. Streaming upload (if CloudKit API supports it)
2. Memory-mapped file reading for large assets
3. Progress tracking (tracked in issue Enhancement: Add progress tracking for large asset uploads #202 ✅)

Pagination Performance

The fetchAllRecordChanges loop is efficient for the common case, but consider:

• Rate limiting between requests (CloudKit has request quotas)
• Cancellation support for long-running fetches
• Backoff strategy if moreComing pagination fails

📋 Best Practices Compliance

✅ Follows CLAUDE.md Guidelines

• Uses async/await consistently
• All types are Codable and Sendable
• Proper use of swift-log for cross-platform logging
• Follows the protocol-oriented design principle
• Error handling with typed CloudKitError
• Good documentation with DocC comments

✅ Follows SwiftLint Type Order

The code follows the default SwiftLint type ordering:

1. Associated types
2. Type properties
3. Instance properties
4. Initializers
5. Type methods
6. Instance methods
7. Subscripts
8. Nested types

📝 Minor Style/Consistency Notes

1. Consistent error messages: All validation errors use the httpErrorWithRawResponse pattern - excellent consistency

2. Logging discipline: All catch blocks properly log errors with appropriate log levels and redaction settings

3. Internal vs public separation: Good use of internal init for converting from OpenAPI schemas

🎯 Recommendations

Must Address (Before Merge)

1. Add comprehensive unit tests for all three operations
2. Consider adding integration tests to the test suite (beyond MistDemo)

Should Address (High Priority)

3. Add maxRecords parameter to fetchAllRecordChanges() or make it internal
4. Document sync token validity and expiration behavior

Nice to Have (Future PRs)

5. Create constants file for CloudKit limits
6. Add convenience properties to ZoneID (isCurrentUser)
7. Consider streaming upload support for large assets
8. Prioritize issue Enhancement: Add AsyncSequence wrapper for fetchRecordChanges streaming #200 (AsyncSequence wrapper) to address memory concerns

🏆 Conclusion

This is high-quality work that significantly expands MistKit's CloudKit API coverage. The implementation is clean, well-documented, and follows established patterns.

The primary concern is the missing test coverage, which should be addressed before merging to ensure reliability and prevent regressions.

Once tests are added, this PR will be ready to merge! 🚀

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Review performed by Claude Sonnet 4.5 via claude.ai/code