support ephemeral containers

[amirmalka]

Type

enhancement

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Description

• Introduced handling for ephemeral container instances including validation, listing, and ID generation.
• Added unit tests for new functions and methods related to ephemeral container instances.
• Enhanced IWorkload interface and workload methods to include ephemeral containers retrieval.
• Updated instance ID generation to support ephemeral containers.

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Changes walkthrough

	Relevant files
Enhancement	7 files helpers.go Add Ephemeral Container Instance Handling                                instanceidhandler/v1/ephemeralcontainerinstance/helpers.go Introduced package ephemeralcontainerinstance for handling ephemeral container instances. Added validateInstanceID function to validate the instance ID fields. Added listInstanceIDs function to list instance IDs for ephemeral containers. +63/-0    initializers.go Ephemeral Container Instance ID Generation Functions          instanceidhandler/v1/ephemeralcontainerinstance/initializers.go Added functions to generate instance IDs from workload, pod, and string for ephemeral containers. +73/-0    instanceidhandler.go Implement Ephemeral Container InstanceID Handling                instanceidhandler/v1/ephemeralcontainerinstance/instanceidhandler.go Implemented InstanceID struct and methods for ephemeral container instances. Added constants and methods for string formatting and hashing of instance IDs. +101/-0  keys.go Add Ephemeral Container Name Metadata Key                                instanceidhandler/v1/helpers/keys.go Added EphemeralContainerNameMetadataKey constant for ephemeral container name metadata. +1/-0      initializers.go Integrate Ephemeral Container Instance ID Generation          instanceidhandler/v1/initializers.go Integrated ephemeral container instance ID generation into GenerateInstanceID functions. +29/-1    interface.go Add Ephemeral Containers Retrieval to IWorkload Interface workloadinterface/interface.go Added GetEphemeralContainers method to the IWorkload interface. +1/-0      workloadmethods.go Implement Ephemeral Containers Retrieval Method                    workloadinterface/workloadmethods.go Implemented GetEphemeralContainers method for workload objects. +17/-0
Tests	5 files helpers_test.go Unit Tests for Ephemeral Container Instance Helpers            instanceidhandler/v1/ephemeralcontainerinstance/helpers_test.go Added tests for validateInstanceID function. Added tests for listInstanceIDs function. +340/-0  initializers_test.go Tests for Ephemeral Container Instance ID Generators          instanceidhandler/v1/ephemeralcontainerinstance/initializers_test.go Added tests for ephemeral container instance ID generation functions. +135/-0  instanceidhandler_test.go Unit Tests for Ephemeral Container InstanceID Methods        instanceidhandler/v1/ephemeralcontainerinstance/instanceidhandler_test.go Added unit tests for InstanceID methods in ephemeral container instance handling. +216/-0  initializers_test.go Update Tests for Instance ID Generation with Ephemeral Containers instanceidhandler/v1/initializers_test.go Updated tests to include ephemeral container instance ID generation. +4/-1      workloadmock.go Mock Implementation for Ephemeral Containers Retrieval      workloadinterface/workloadmock.go Added mock implementation for GetEphemeralContainers method. +5/-0

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PR Description updated to latest commit (e50dbfa)

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PR Review

⏱️ Estimated effort to review [1-5]	4, because the PR introduces significant changes across multiple files, including new functionalities for handling ephemeral containers, extensive unit tests, and modifications to existing interfaces and methods. The complexity and breadth of these changes require a thorough review to ensure correctness, compatibility, and adherence to best practices.
🧪 Relevant tests	Yes
🔍 Possible issues	Possible Bug: The listInstanceIDs function in helpers.go returns an empty slice and nil error when ephemeralContainers are empty. This behavior is correct, but it's important to ensure that calling functions handle this case appropriately to avoid potential nil pointer dereferences or unexpected behavior.
	Performance Concern: The listInstanceIDs function iterates over all ephemeral containers and validates each instance ID. In scenarios with a large number of ephemeral containers, this could introduce performance bottlenecks. Consider optimizing this process or documenting potential performance implications.
🔒 Security concerns	No

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PR Code Suggestions

Category	Suggestions
Enhancement	Refactor Test_validateInstanceID to use table-driven tests with subtests. Consider using table-driven tests with subtests for Test_validateInstanceID to improve code readability and maintainability. This approach allows you to define test cases in a structured format and run them as subtests, which can make it easier to identify which test case fails without having to navigate through multiple test functions. instanceidhandler/v1/ephemeralcontainerinstance/helpers_test.go [11-112] -func Test_validateInstanceID(t *testing.T) { - type args struct { +func TestValidateInstanceID(t *testing.T) { + tests := []struct { + name string instanceID *InstanceID + wantErr bool + }{ + // Test cases here } - tests := []struct { - name string - args args - wantErr bool - }{ + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + if err := validateInstanceID(tt.instanceID); (err != nil) != tt.wantErr { + t.Errorf("validateInstanceID() error = %v, wantErr %v", err, tt.wantErr) + } + }) + }
	Improve error handling in tests for better readability and consistency. Instead of using t.Fatalf directly with err.Error(), you can use require.NoError(t, err, "custom error message") for better readability and consistency. This also applies to other error handling in tests. instanceidhandler/v1/ephemeralcontainerinstance/initializers_test.go [18] -if err != nil { - t.Fatalf(err.Error()) -} +require.NoError(t, err, "can't create instance ID from pod")
	Use more descriptive error messages for better debugging. Consider using a more descriptive error message that includes the kind of workload when the kind is not "Pod". This will help in debugging and understanding the context of the error. instanceidhandler/v1/ephemeralcontainerinstance/initializers.go [17] -return nil, fmt.Errorf("CreateInstanceID: workload kind must be Pod for create instance ID") +return nil, fmt.Errorf("GenerateInstanceID: workload kind must be Pod, got %s", w.GetKind())
	Implement the GetEphemeralContainers method in the IBasicWorkload interface. Consider implementing the GetEphemeralContainers method to ensure that the interface IBasicWorkload fully supports ephemeral containers, as this feature is crucial for temporary or debugging workloads in Kubernetes. workloadinterface/interface.go [60] -GetEphemeralContainers() ([]corev1.EphemeralContainer, error) +GetEphemeralContainers() ([]corev1.EphemeralContainer, error) { + // Implementation goes here +}
	Add descriptive labels to the service for better observability. To enhance the observability of the service, consider adding more descriptive labels that reflect the service's purpose, version, and other relevant metadata. instanceidhandler/v1/ephemeralcontainerinstance/testdata/service.json [6-8] "labels": { "app": "armo-vuln-scan", - "app.kubernetes.io/managed-by": "Helm" + "app.kubernetes.io/managed-by": "Helm", + "app.kubernetes.io/name": "armo-vuln-scan", + "app.kubernetes.io/version": "1.0.0" }
Best practice	Use mocks for external dependencies in Test_listInstanceIDs. For the listInstanceIDs function tests, consider using a mock for external dependencies to ensure that your unit tests are not dependent on the external state. This will make your tests more reliable and faster. instanceidhandler/v1/ephemeralcontainerinstance/helpers_test.go [115-339] -func Test_listInstanceIDs(t *testing.T) { - type args struct { - ownerReferences []metav1.OwnerReference - containers []core1.EphemeralContainer - apiVersion string - namespace string - kind string - name string - } +func TestListInstanceIDs(t *testing.T) { + // Use a mocking framework to mock external dependencies + // Define your tests here +}
	Use errors.New for simple error messages. Avoid using fmt.Errorf for errors that do not format strings. Instead, use errors.New for simple error messages to improve code readability. instanceidhandler/v1/ephemeralcontainerinstance/instanceidhandler_test.go [30-31] if err != nil { - return fmt.Errorf(err.Error()) + return errors.New(err.Error()) }
	Use consistent imagePullPolicy across all container types for reliability. For consistency and to avoid potential image mismatches, consider using the same imagePullPolicy across all container types, including ephemeralContainers and initContainers. instanceidhandler/v1/testdata/deployment.json [27-31] "ephemeralContainers": [ { "image": "nginx@sha256:f7988fb6c02e0ce69257d9bd9cf37ae20a60f1df7563c3a2a6abe24160306b8d", - "imagePullPolicy": "IfNotPresent", + "imagePullPolicy": "Always", "name": "abc" } ]
	Set resource limits for the ephemeral container to manage resource usage. To ensure that the ephemeral container is only used for its intended short-lived operations, it's recommended to set a resource limit to prevent it from consuming excessive cluster resources. instanceidhandler/v1/ephemeralcontainerinstance/testdata/jobPod.json [30-45] "ephemeralContainers": [ { "image": "nginx", "imagePullPolicy": "Always", "name": "nginx-job", - "resources": {}, + "resources": { + "limits": { + "cpu": "100m", + "memory": "200Mi" + }, + "requests": { + "cpu": "50m", + "memory": "100Mi" + } + }, "terminationMessagePath": "/dev/termination-log", "terminationMessagePolicy": "File", "volumeMounts": [ { "mountPath": "/var/run/secrets/kubernetes.io/serviceaccount", "name": "kube-api-access-8b7q6", "readOnly": true } ] } ]
Maintainability	Use constants for repeated string literals. Consider using constants for repeated string literals to make the code more maintainable and to avoid typos in string values. instanceidhandler/v1/ephemeralcontainerinstance/instanceidhandler_test.go [110-116] +const ( + apiGroup = "apps" + apiVersion = "v1" + namespace = "default" + kind = "ReplicaSet" + name = "nginx-84f5585d68" + containerName = "nginx" +) expectedLabels := map[string]string{ - helpers.ApiGroupMetadataKey: "apps", - helpers.ApiVersionMetadataKey: "v1", - helpers.NamespaceMetadataKey: "default", - helpers.KindMetadataKey: "ReplicaSet", - helpers.NameMetadataKey: "nginx-84f5585d68", - helpers.EphemeralContainerNameMetadataKey: "nginx", + helpers.ApiGroupMetadataKey: apiGroup, + helpers.ApiVersionMetadataKey: apiVersion, + helpers.NamespaceMetadataKey: namespace, + helpers.KindMetadataKey: kind, + helpers.NameMetadataKey: name, + helpers.EphemeralContainerNameMetadataKey: containerName, }
	Break down checkAllsFunctions into smaller test helper functions. For better test readability and maintenance, consider breaking down checkAllsFunctions into smaller, more focused test helper functions. Each helper function should aim to assert a specific aspect of the InstanceID object. instanceidhandler/v1/ephemeralcontainerinstance/instanceidhandler_test.go [27-98] -func checkAllsFunctions(object string, apiversion, namespace, kind, name, containerName, formattedString, expectedHash string, expectedLabels map[string]string) error { +// Example of breaking down into smaller functions +func assertAPIVersion(t *testing.T, instanceID *InstanceID, expected string) { + if instanceID.GetAPIVersion() != expected { + t.Errorf("APIVersion got = %s, want %s", instanceID.GetAPIVersion(), expected) + } +} +// Additional functions for other assertions
	Refactor parsing and validation logic for better maintainability. To improve maintainability, consider refactoring the GenerateInstanceIDFromString function to split the parsing and validation logic into separate functions. This will make the code easier to read and maintain. instanceidhandler/v1/ephemeralcontainerinstance/initializers.go [39] func GenerateInstanceIDFromString(input string) (*InstanceID, error) { + // Refactored parsing logic into parseInput function + fields, err := parseInput(input) + if err != nil { + return nil, err + } + // Refactored instance ID creation into createInstanceID function + instanceID, err := createInstanceID(fields) + if err != nil { + return nil, err + } + return instanceID, nil +}
Security	Enhance security by using a stronger hash function. To enhance security, consider using a stronger hash function than SHA-256 for generating the hashed instance ID, such as SHA-384 or SHA-512. instanceidhandler/v1/ephemeralcontainerinstance/instanceidhandler.go [82] -hash := sha256.Sum256([]byte(id.GetStringFormatted())) +hash := sha512.Sum512([]byte(id.GetStringFormatted()))
	Add security contexts to ephemeralContainers to enhance pod security. Ensure that the ephemeralContainers field includes necessary security contexts to maintain the security posture of the pod, especially when running in production environments. instanceidhandler/v1/ephemeralcontainerinstance/testdata/deployment.json [27-47] "ephemeralContainers": [ { "env": [ { "name": "DEMO_GREETING", "value": "Hellofromtheenvironment" } ], "image": "nginx@sha256:f7988fb6c02e0ce69257d9bd9cf37ae20a60f1df7563c3a2a6abe24160306b8d", "imagePullPolicy": "IfNotPresent", "name": "nginx", "resources": {}, "terminationMessagePath": "/dev/termination-log", "terminationMessagePolicy": "File", "volumeMounts": [ { "mountPath": "/var/run/secrets/kubernetes.io/serviceaccount", "name": "kube-api-access-g42z4", "readOnly": true } - ] + ], + "securityContext": { + "runAsUser": 1000, + "allowPrivilegeEscalation": false + } } ]
Performance	Pre-allocate slices for better performance and reduced memory usage. For better performance and reduced memory usage, consider pre-allocating the slice instanceIDs with the expected capacity, since the length of ephemeralContainers is known. instanceidhandler/v1/ephemeralcontainerinstance/initializers.go [36] -instanceIDs := make([]InstanceID, 0) +instanceIDs := make([]InstanceID, 0, len(ephemeralContainers))

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