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# Implementation: Kubernetes Version Collection with TTL Caching
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## Overview
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Add a `collectK8sVersion` function to the Azure property provider that collects the Kubernetes server version using the discoveryClient with a 15-minute TTL cache to minimize API calls.
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## Plan
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### Phase 1: Add Cache Fields
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**Task 1.1: Add cache-related fields to PropertyProvider struct**
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- Add `cachedK8sVersion` string field to store the cached version
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- Add `k8sVersionCacheTime` time.Time field to track when the cache was last updated
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- Add `k8sVersionCacheTTL` time.Duration field set to 15 minutes
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- Add a mutex for thread-safe access to cached values
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### Phase 2: Implement collectK8sVersion Function
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**Task 2.1: Implement the collectK8sVersion function**
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- Check if cached version exists and is still valid (within TTL)
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- If cache is valid, return cached version
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- If cache is expired or empty, call discoveryClient.ServerVersion()
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- Update cache with new version and current timestamp
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- Return the version as a property with observation time
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### Phase 3: Integrate into Collect Method
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**Task 3.1: Call collectK8sVersion in Collect method**
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- Add call to collectK8sVersion in the Collect method
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- Store the k8s version in the properties map
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### Phase 4: Write Unit Tests
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**Task 4.1: Create unit tests for collectK8sVersion**
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- Test cache hit scenario (cached version within TTL)
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- Test cache miss scenario (no cached version)
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- Test cache expiration scenario (cached version expired)
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- Test error handling from discoveryClient
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- Test thread safety of cache access
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### Phase 5: Verify Tests Pass
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**Task 5.1: Run unit tests**
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- Execute `go test` for the provider package
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- Verify all tests pass
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## Success Criteria
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-[x] Cache fields added to PropertyProvider struct
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-[x] collectK8sVersion function implemented with TTL logic
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-[x] Function integrated into Collect method
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-[x] Unit tests created and passing
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-[x] Thread-safe implementation verified
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## Implementation Notes
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- Using sync.RWMutex for thread-safe cache access
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- TTL set to 15 minutes as specified
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- Uses the standard `propertyprovider.K8sVersionProperty` constant instead of creating a new one
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- Changed `discoveryClient` field type from `discovery.DiscoveryInterface` to `discovery.ServerVersionInterface` for better testability and to only depend on the interface we actually need
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- Fixed test nil pointer issue by conditionally setting the discoveryClient field only when it's non-nil
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## Final Implementation Summary
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All tasks completed successfully. The `collectK8sVersion` function now:
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1. Caches the Kubernetes version with a 15-minute TTL
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2. Uses thread-safe mutex locks for concurrent access
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3. Properly handles nil discovery client cases
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4. Returns early if cache is still valid to minimize API calls
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5. Updates cache atomically when fetching new version
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6. Has comprehensive unit tests covering all scenarios including cache hits, misses, expiration, errors, and concurrency
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## Integration Test Updates
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Updated integration tests to ignore the new k8s version property in comparisons:
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- Added `ignoreK8sVersionProperty` using `cmpopts.IgnoreMapEntries` to filter out the k8s version from test expectations
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- Integration tests now pass successfully (33 specs all passed)
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- The k8s version is being collected correctly from the test Kubernetes environment, validating the implementation works end-to-end
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## Test Results
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- Unit tests: ✅ 8/8 passed (7 in TestCollectK8sVersion + 1 in TestCollectK8sVersionConcurrency)
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- Integration tests: ✅ 33/33 specs passed
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- All scenarios validated including cache behavior, TTL expiration, error handling, and thread safety
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## Refactoring
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Simplified the implementation by removing the `k8sVersionCacheTTL` instance field from PropertyProvider:
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- Removed the `k8sVersionCacheTTL time.Duration` field from the struct
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- Updated `collectK8sVersion` to use the `K8sVersionCacheTTL` constant directly
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- Removed field initialization from `New()` and `NewWithPricingProvider()` constructors
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- Updated unit tests to remove the field from test PropertyProvider instances
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