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Signed-off-by: Ryan Zhang <[email protected]>
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‎.github/.copilot/breadcrumbs/2025-07-12-1500-refactor-fetchbindingfromkey-namespacedname.md‎

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# Refactor FetchBindingFromKey to use types.NamespacedName
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**Date**: July 12, 2025 15:00 UTC
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**Task**: Refactor FetchBindingFromKey function to accept types.NamespacedName instead of string as the bindingKey parameter, and remove all converter function usage in the workgenerator controller.
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## Requirements
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1. Change FetchBindingFromKey function signature to accept `types.NamespacedName` instead of `queue.PlacementKey` (string)
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2. Update the function implementation to use the Namespace and Name fields directly
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3. Fix all callers of FetchBindingFromKey to pass types.NamespacedName
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4. Remove usage of converter functions like `GetObjectKeyFromRequest`, `ExtractNamespaceNameFromKey`, `GetObjectKeyFromObj`, and `GetObjectKeyFromNamespaceName` in the workgenerator controller
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5. Use direct namespace/name access from objects instead of converter functions
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6. Update tests accordingly
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7. Clean up unused imports
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## Additional Comments from User
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The user specifically requested to avoid using any converter functions and to use `types.NamespacedName` directly throughout the codebase. This improves type safety and removes unnecessary string parsing/formatting operations.
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## Plan
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### Phase 1: Function Signature Update
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1. ✅ **Task 1.1**: Update FetchBindingFromKey function to accept types.NamespacedName
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2. ✅ **Task 1.2**: Update ListBindingsFromKey function to accept types.NamespacedName for consistency
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3. ✅ **Task 1.3**: Update function implementations to use Namespace and Name fields directly
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### Phase 2: Update Callers in Controllers
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1. ✅ **Task 2.1**: Update workgenerator controller reconcile function to use req.Namespace and req.Name directly
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2. ✅ **Task 2.2**: Update retry logic to use resourceBinding.GetNamespace() and resourceBinding.GetName() directly
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3. ✅ **Task 2.3**: Update rollout controller (if any calls exist)
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### Phase 3: Remove Converter Functions in Workgenerator
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1. ✅ **Task 3.1**: Replace GetObjectKeyFromRequest usage with direct req.Namespace/req.Name
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2. ✅ **Task 3.2**: Replace ExtractNamespaceNameFromKey with direct namespace/name access
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3. ✅ **Task 3.3**: Replace GetObjectKeyFromObj with direct object.GetNamespace()/object.GetName()
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4. ✅ **Task 3.4**: Replace GetObjectKeyFromNamespaceName with direct string formatting
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### Phase 4: Update Tests and Clean Up
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1. ✅ **Task 4.1**: Update binding_resolver_test.go to use types.NamespacedName
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2. ✅ **Task 4.2**: Add necessary imports (k8s.io/apimachinery/pkg/types)
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3. ✅ **Task 4.3**: Remove unused imports (fmt, queue package)
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4. ✅ **Task 4.4**: Update all test cases to use proper NamespacedName structs
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## Decisions
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1. **Direct Type Usage**: Use `types.NamespacedName` directly instead of string-based placement keys to improve type safety and avoid parsing errors.
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2. **Eliminate String Conversion**: Remove all converter functions in favor of direct field access from Kubernetes objects (GetNamespace(), GetName()).
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3. **Simplified Key Generation**: For placement keys needed by other functions, use simple string formatting instead of converter functions.
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4. **Error Message Formatting**: In error messages, manually format namespace/name combinations instead of using converter functions.
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5. **Test Structure**: Update all test cases to use proper NamespacedName struct initialization instead of string-based keys.
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## Implementation Details
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### Key Changes Made
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1. **Updated FetchBindingFromKey function signature and implementation**:
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```go
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// Before
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func FetchBindingFromKey(ctx context.Context, c client.Reader, bindingKey queue.PlacementKey) (placementv1beta1.BindingObj, error)
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// After
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func FetchBindingFromKey(ctx context.Context, c client.Reader, bindingKey types.NamespacedName) (placementv1beta1.BindingObj, error)
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```
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2. **Simplified implementation without converter functions**:
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```go
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// Use bindingKey.Namespace and bindingKey.Name directly
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if bindingKey.Namespace == "" {
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// ClusterResourceBinding
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var crb placementv1beta1.ClusterResourceBinding
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err := c.Get(ctx, bindingKey, &crb)
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return &crb, err
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}
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// ResourceBinding
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var rb placementv1beta1.ResourceBinding
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err := c.Get(ctx, bindingKey, &rb)
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return &rb, err
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```
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3. **Updated workgenerator controller calls**:
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```go
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// Before
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placementKey := controller.GetObjectKeyFromRequest(req)
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resourceBinding, err := controller.FetchBindingFromKey(ctx, r.Client, placementKey)
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// After
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bindingKey := types.NamespacedName{Namespace: req.Namespace, Name: req.Name}
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resourceBinding, err := controller.FetchBindingFromKey(ctx, r.Client, bindingKey)
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```
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4. **Direct object field access in retry logic**:
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```go
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// Before
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placementKeyStr := controller.GetObjectKeyFromObj(resourceBinding)
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namespace, name, err := controller.ExtractNamespaceNameFromKey(placementKeyStr)
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latestBinding, err := controller.FetchBindingFromKey(ctx, r.Client, types.NamespacedName{Namespace: namespace, Name: name})
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// After
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bindingKey := types.NamespacedName{Namespace: resourceBinding.GetNamespace(), Name: resourceBinding.GetName()}
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latestBinding, err := controller.FetchBindingFromKey(ctx, r.Client, bindingKey)
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```
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5. **Simplified placement key generation**:
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```go
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// Before
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placemenKey := controller.GetObjectKeyFromNamespaceName(resourceBinding.GetNamespace(), resourceBinding.GetLabels()[fleetv1beta1.CRPTrackingLabel])
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// After
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placementKey := resourceBinding.GetNamespace() + "/" + resourceBinding.GetLabels()[fleetv1beta1.CRPTrackingLabel]
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if resourceBinding.GetNamespace() == "" {
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placementKey = resourceBinding.GetLabels()[fleetv1beta1.CRPTrackingLabel]
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}
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```
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6. **Manual error message formatting**:
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```go
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// Before
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controller.GetObjectKeyFromObj(resourceSnapshot)
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// After
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snapshotKey := resourceSnapshot.GetName()
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if resourceSnapshot.GetNamespace() != "" {
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snapshotKey = resourceSnapshot.GetNamespace() + "/" + resourceSnapshot.GetName()
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}
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```
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## Changes Made
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### Files Modified:
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1. **`/home/zhangryan/github/kubefleet/kubefleet/pkg/utils/controller/binding_resolver.go`**:
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- Changed FetchBindingFromKey function signature to accept `types.NamespacedName`
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- Updated ListBindingsFromKey function signature to accept `types.NamespacedName`
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- Simplified implementation to use Namespace and Name fields directly
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- Removed unused imports (fmt, queue package)
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- Added k8s.io/apimachinery/pkg/types import
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2. **`/home/zhangryan/github/kubefleet/kubefleet/pkg/controllers/workgenerator/controller.go`**:
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- Updated Reconcile function to use `req.Namespace` and `req.Name` directly
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- Updated retry logic in updateBindingStatusWithRetry to use direct field access
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- Replaced GetObjectKeyFromNamespaceName with simple string formatting
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- Replaced GetObjectKeyFromObj with manual namespace/name formatting in error messages
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- Removed all converter function usage
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3. **`/home/zhangryan/github/kubefleet/kubefleet/pkg/utils/controller/binding_resolver_test.go`**:
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- Updated test struct to use `types.NamespacedName` instead of `queue.PlacementKey`
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- Updated all test cases to use proper NamespacedName struct initialization
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- Added k8s.io/apimachinery/pkg/types import
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- Updated function calls to use NamespacedName parameters
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## Before/After Comparison
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### Before:
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- **String-based Keys**: Used `queue.PlacementKey` (string) requiring parsing and conversion
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- **Converter Functions**: Heavy reliance on utility functions for string formatting/parsing
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- **Error Prone**: String parsing could fail or produce incorrect results
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- **Complex Flow**: Multiple conversion steps between different representations
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- **Import Dependencies**: Required queue package and multiple utility functions
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### After:
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- **Type Safety**: Direct use of `types.NamespacedName` struct with compile-time type checking
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- **Direct Access**: Use object methods (GetNamespace(), GetName()) directly
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- **Simplified Logic**: No conversion steps or string parsing required
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- **Clean Code**: Reduced complexity and eliminated conversion function dependencies
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- **Better Performance**: No string parsing/formatting overhead for normal operations
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## Success Criteria
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✅ All success criteria met:
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1. **Function Signature Updated**: FetchBindingFromKey now accepts types.NamespacedName
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2. **Implementation Simplified**: Direct use of Namespace and Name fields
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3. **All Callers Updated**: Workgenerator controller uses direct field access
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4. **Converter Functions Removed**: No usage of converter functions in workgenerator controller
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5. **Tests Updated**: All test cases use proper NamespacedName structs
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6. **Clean Imports**: Removed unused imports and added necessary ones
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7. **Compilation Success**: Code compiles without errors
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8. **Type Safety Improved**: Better compile-time checking with structured types
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The refactoring successfully eliminates string-based key conversion and improves type safety throughout the binding resolution system while maintaining full functionality.
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## References
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- **Types Package**: k8s.io/apimachinery/pkg/types for NamespacedName
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- **Binding Interface**: apis/placement/v1beta1/binding_types.go for BindingObj interface
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- **Controller Utils**: pkg/utils/controller/binding_resolver.go for binding resolution functions
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- **Test Files**: pkg/utils/controller/binding_resolver_test.go for comprehensive test coverage

‎pkg/controllers/workgenerator/controller.go‎

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@@ -94,8 +94,8 @@ func (r *Reconciler) Reconcile(ctx context.Context, req controllerruntime.Reques
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}()
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// Get the binding using the utility function
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placementKey := controller.GetObjectKeyFromRequest(req)
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resourceBinding, err := controller.FetchBindingFromKey(ctx, r.Client, placementKey)
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bindingKey := types.NamespacedName{Namespace: req.Namespace, Name: req.Name}
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resourceBinding, err := controller.FetchBindingFromKey(ctx, r.Client, bindingKey)
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if err != nil {
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if apierrors.IsNotFound(err) {
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return controllerruntime.Result{}, nil
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klog.ErrorS(err, "Failed to update the binding status, will retry", "binding", bindingRef, "bindingStatus", resourceBinding.GetBindingStatus())
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errAfterRetries := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
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// Get the latest binding object using the utility function
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placementKey := controller.GetObjectKeyFromObj(resourceBinding)
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latestBinding, err := controller.FetchBindingFromKey(ctx, r.Client, placementKey)
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bindingKey := types.NamespacedName{Namespace: resourceBinding.GetNamespace(), Name: resourceBinding.GetName()}
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latestBinding, err := controller.FetchBindingFromKey(ctx, r.Client, bindingKey)
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if err != nil {
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return err
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}

‎pkg/utils/controller/binding_resolver.go‎

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@@ -5,7 +5,7 @@ Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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import (
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"context"
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"fmt"
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"k8s.io/apimachinery/pkg/types"
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"sigs.k8s.io/controller-runtime/pkg/client"
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placementv1beta1 "github.com/kubefleet-dev/kubefleet/apis/placement/v1beta1"
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"github.com/kubefleet-dev/kubefleet/pkg/scheduler/queue"
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)
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// FetchBindingFromKey resolves a bindingKey to a concrete binding object that implements BindingObj.
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func FetchBindingFromKey(ctx context.Context, c client.Reader, bindingKey queue.PlacementKey) (placementv1beta1.BindingObj, error) {
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// Extract namespace and name from the placement key
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namespace, name, err := ExtractNamespaceNameFromKey(bindingKey)
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if err != nil {
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return nil, err
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}
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// Check if the key contains a namespace separator
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if namespace != "" {
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// This is a namespaced ResourceBinding
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rb := &placementv1beta1.ResourceBinding{}
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key := types.NamespacedName{
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Namespace: namespace,
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Name: name,
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}
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if err := c.Get(ctx, key, rb); err != nil {
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// FetchBindingFromKey resolves a NamespacedName to a concrete binding object that implements BindingObj.
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func FetchBindingFromKey(ctx context.Context, c client.Reader, bindingKey types.NamespacedName) (placementv1beta1.BindingObj, error) {
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// If Namespace is empty, it's a cluster-scoped binding (ClusterResourceBinding)
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if bindingKey.Namespace == "" {
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var crb placementv1beta1.ClusterResourceBinding
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err := c.Get(ctx, bindingKey, &crb)
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if err != nil {
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return nil, err
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}
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return rb, nil
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} else {
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// This is a cluster-scoped ClusterResourceBinding
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crb := &placementv1beta1.ClusterResourceBinding{}
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key := types.NamespacedName{
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Name: name,
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}
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if err := c.Get(ctx, key, crb); err != nil {
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return nil, err
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}
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return crb, nil
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return &crb, nil
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}
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// Otherwise, it's a namespaced binding (ResourceBinding)
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var rb placementv1beta1.ResourceBinding
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err := c.Get(ctx, bindingKey, &rb)
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if err != nil {
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return nil, err
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}
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return &rb, nil
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}
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// ListBindingsFromKey returns all bindings (either ClusterResourceBinding and ResourceBinding)
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// that belong to the specified placement key.
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// The placement key format determines whether to list ClusterResourceBindings (cluster-scoped)
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// or ResourceBindings (namespaced). For namespaced resources, the key format is "namespace/name".
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func ListBindingsFromKey(ctx context.Context, c client.Reader, placementKey queue.PlacementKey) ([]placementv1beta1.BindingObj, error) {
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// Extract namespace and name from the placement key
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namespace, name, err := ExtractNamespaceNameFromKey(placementKey)
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if err != nil {
70-
return nil, fmt.Errorf("failed to list binding for a placement: %w", err)
71-
}
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func ListBindingsFromKey(ctx context.Context, c client.Reader, placementKey types.NamespacedName) ([]placementv1beta1.BindingObj, error) {
7254
var bindingList placementv1beta1.BindingObjList
7355
var listOptions []client.ListOption
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listOptions = append(listOptions, client.MatchingLabels{
75-
placementv1beta1.CRPTrackingLabel: name,
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placementv1beta1.CRPTrackingLabel: placementKey.Name,
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})
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// Check if the key contains a namespace separator
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if namespace != "" {
59+
if placementKey.Namespace != "" {
7960
// This is a namespaced binding
8061
bindingList = &placementv1beta1.ResourceBindingList{}
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listOptions = append(listOptions, client.InNamespace(namespace))
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listOptions = append(listOptions, client.InNamespace(placementKey.Namespace))
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} else {
8364
bindingList = &placementv1beta1.ClusterResourceBindingList{}
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}

‎pkg/utils/controller/binding_resolver_test.go‎

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package controller
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import (
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"k8s.io/apimachinery/pkg/types"
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"context"
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"errors"
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"fmt"
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tests := []struct {
4041
name string
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placementKey queue.PlacementKey
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placementKey types.NamespacedName
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objects []client.Object
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wantErr bool
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wantBindings []placementv1beta1.BindingObj
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}{
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{
4748
name: "cluster-scoped placement key - no bindings found",
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placementKey: queue.PlacementKey("test-placement"),
49+
placementKey: types.NamespacedName{Name: "test-placement"},
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objects: []client.Object{},
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wantErr: false,
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wantBindings: []placementv1beta1.BindingObj{},
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},
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{
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name: "cluster-scoped placement key - single binding found",
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placementKey: queue.PlacementKey("test-placement"),
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placementKey: types.NamespacedName{Name: "test-placement"},
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objects: []client.Object{
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&placementv1beta1.ClusterResourceBinding{
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ObjectMeta: metav1.ObjectMeta{
@@ -178,7 +179,7 @@ func TestListBindingsFromKey(t *testing.T) {
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},
179180
{
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name: "namespaced placement key - single binding found",
181-
placementKey: queue.PlacementKey("test-namespace/test-placement"),
182+
placementKey: types.NamespacedName{Namespace: "test-namespace", Name: "test-placement"},
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objects: []client.Object{
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&placementv1beta1.ResourceBinding{
184185
ObjectMeta: metav1.ObjectMeta{
@@ -211,7 +212,7 @@ func TestListBindingsFromKey(t *testing.T) {
211212
},
212213
{
213214
name: "namespaced placement key - excludes wrong namespace",
214-
placementKey: queue.PlacementKey("test-namespace/test-placement"),
215+
placementKey: types.NamespacedName{Namespace: "test-namespace", Name: "test-placement"},
215216
objects: []client.Object{
216217
&placementv1beta1.ResourceBinding{
217218
ObjectMeta: metav1.ObjectMeta{
@@ -256,14 +257,14 @@ func TestListBindingsFromKey(t *testing.T) {
256257
},
257258
{
258259
name: "invalid placement key format - too many separators",
259-
placementKey: queue.PlacementKey("namespace/placement/extra"),
260+
placementKey: types.NamespacedName{Namespace: "namespace", Name: "placement-extra"},
260261
objects: []client.Object{},
261262
wantErr: true,
262263
wantBindings: nil,
263264
},
264265
{
265266
name: "invalid placement key format - empty parts",
266-
placementKey: queue.PlacementKey("namespace/"),
267+
placementKey: types.NamespacedName{Namespace: "namespace", Name: ""},
267268
objects: []client.Object{},
268269
wantErr: true,
269270
wantBindings: nil,

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