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Add possibility to add resource request/limit to initContainer #121

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58 changes: 57 additions & 1 deletion pkg/certinjectionwebhook/admission_controller.go
Original file line number Diff line number Diff line change
Expand Up @@ -8,18 +8,19 @@ import (
"context"
"encoding/json"
"fmt"

"github.com/pkg/errors"
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Missing import for resource.MustParse()

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Removed MustParse()

admissionv1 "k8s.io/api/admission/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"knative.dev/pkg/apis"
"knative.dev/pkg/apis/duck"
"knative.dev/pkg/logging"
"knative.dev/pkg/webhook"
"os"

"github.com/vmware-tanzu/cert-injection-webhook/pkg/certs"
)
Expand Down Expand Up @@ -187,6 +188,18 @@ func (ac *admissionController) SetEnvVars(ctx context.Context, obj *corev1.Pod)
}
}

func ParseResource(envVar string) (resource.Quantity, error) {
value, found := os.LookupEnv(envVar)
if !found {
return resource.Quantity{}, nil // Return an empty Quantity if env var is missing
}
qty, err := resource.ParseQuantity(value)
if err != nil {
return resource.Quantity{}, fmt.Errorf("failed to parse %s: %w", envVar, err)
}
return qty, nil
}

func (ac *admissionController) SetCaCerts(ctx context.Context, obj *corev1.Pod) {
if ac.caCertsData == "" {
return
Expand Down Expand Up @@ -224,6 +237,44 @@ func (ac *admissionController) SetCaCerts(ctx context.Context, obj *corev1.Pod)
})
}

var resources corev1.ResourceRequirements

if cpuRequest, err := ParseResource("INIT_CONTAINER_CPU_REQUEST"); err == nil {
if resources.Requests == nil {
resources.Requests = corev1.ResourceList{}
}
resources.Requests[corev1.ResourceCPU] = cpuRequest
} else {
fmt.Printf("Warning: %v\n", err)
}

if memoryRequest, err := ParseResource("INIT_CONTAINER_MEMORY_REQUEST"); err == nil {
if resources.Requests == nil {
resources.Requests = corev1.ResourceList{}
}
resources.Requests[corev1.ResourceMemory] = memoryRequest
} else {
fmt.Printf("Warning: %v\n", err)
}

if cpuLimit, err := ParseResource("INIT_CONTAINER_CPU_LIMIT"); err == nil {
if resources.Limits == nil {
resources.Limits = corev1.ResourceList{}
}
resources.Limits[corev1.ResourceCPU] = cpuLimit
} else {
fmt.Printf("Warning: %v\n", err)
}

if memoryLimit, err := ParseResource("INIT_CONTAINER_MEMORY_LIMIT"); err == nil {
if resources.Limits == nil {
resources.Limits = corev1.ResourceList{}
}
resources.Limits[corev1.ResourceMemory] = memoryLimit
} else {
fmt.Printf("Warning: %v\n", err)
}

container := corev1.Container{
Name: "setup-ca-certs",
Image: ac.setupCACertsImage,
Expand All @@ -244,6 +295,11 @@ func (ac *admissionController) SetCaCerts(ctx context.Context, obj *corev1.Pod)
Capabilities: &corev1.Capabilities{Drop: []corev1.Capability{"ALL"}},
},
}

if len(resources.Requests) > 0 || len(resources.Limits) > 0 {
container.Resources = resources
}

obj.Spec.InitContainers = append([]corev1.Container{container}, obj.Spec.InitContainers...)
}

Expand Down
105 changes: 103 additions & 2 deletions pkg/certinjectionwebhook/admission_controller_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -6,20 +6,20 @@ package certinjectionwebhook_test
import (
"context"
"encoding/json"
"os"
"testing"

jp "github.com/evanphx/json-patch/v5"
"github.com/sclevine/spec"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/vmware-tanzu/cert-injection-webhook/pkg/certinjectionwebhook"
"gomodules.xyz/jsonpatch/v3"
admissionv1 "k8s.io/api/admission/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
wtesting "knative.dev/pkg/webhook/testing"

"github.com/vmware-tanzu/cert-injection-webhook/pkg/certinjectionwebhook"
)

func TestPodAdmissionController(t *testing.T) {
Expand Down Expand Up @@ -1396,3 +1396,104 @@ func testPodAdmissionController(t *testing.T, when spec.G, it spec.S) {
})

}

func TestParseResource(t *testing.T) {
tests := []struct {
name string
envVar string
envValue string
expectErr bool
expectVal string
}{
{"Valid CPU Request", "TEST_CPU_REQUEST", "100m", false, "100m"},
{"Valid Memory Request", "TEST_MEMORY_REQUEST", "128Mi", false, "128Mi"},
{"Invalid Format", "TEST_INVALID", "invalid", true, ""},
{"Missing Env Var", "TEST_MISSING", "", false, ""},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
// Set or unset the environment variable
if tt.envValue != "" {
os.Setenv(tt.envVar, tt.envValue)
defer os.Unsetenv(tt.envVar)
} else {
os.Unsetenv(tt.envVar)
}

qty, err := certinjectionwebhook.ParseResource(tt.envVar)
if (err != nil) != tt.expectErr {
t.Errorf("Expected error: %v, got: %v", tt.expectErr, err)
}

if err == nil && tt.expectVal != "" && qty.String() != tt.expectVal {
t.Errorf("Expected value: %s, got: %s", tt.expectVal, qty.String())
}
})
}
}

func TestResourceRequirementsParsing(t *testing.T) {
// Set environment variables
os.Setenv("INIT_CONTAINER_CPU_REQUEST", "200m")
os.Setenv("INIT_CONTAINER_MEMORY_REQUEST", "256Mi")
os.Setenv("INIT_CONTAINER_CPU_LIMIT", "1")
os.Setenv("INIT_CONTAINER_MEMORY_LIMIT", "512Mi")
defer func() {
os.Unsetenv("INIT_CONTAINER_CPU_REQUEST")
os.Unsetenv("INIT_CONTAINER_MEMORY_REQUEST")
os.Unsetenv("INIT_CONTAINER_CPU_LIMIT")
os.Unsetenv("INIT_CONTAINER_MEMORY_LIMIT")
}()

var resources corev1.ResourceRequirements

// Apply the logic under test
if cpuRequest, err := certinjectionwebhook.ParseResource("INIT_CONTAINER_CPU_REQUEST"); err == nil {
if resources.Requests == nil {
resources.Requests = corev1.ResourceList{}
}
resources.Requests[corev1.ResourceCPU] = cpuRequest
}
if memoryRequest, err := certinjectionwebhook.ParseResource("INIT_CONTAINER_MEMORY_REQUEST"); err == nil {
if resources.Requests == nil {
resources.Requests = corev1.ResourceList{}
}
resources.Requests[corev1.ResourceMemory] = memoryRequest
}
if cpuLimit, err := certinjectionwebhook.ParseResource("INIT_CONTAINER_CPU_LIMIT"); err == nil {
if resources.Limits == nil {
resources.Limits = corev1.ResourceList{}
}
resources.Limits[corev1.ResourceCPU] = cpuLimit
}
if memoryLimit, err := certinjectionwebhook.ParseResource("INIT_CONTAINER_MEMORY_LIMIT"); err == nil {
if resources.Limits == nil {
resources.Limits = corev1.ResourceList{}
}
resources.Limits[corev1.ResourceMemory] = memoryLimit
}

expectedRequests := map[corev1.ResourceName]string{
corev1.ResourceCPU: "200m",
corev1.ResourceMemory: "256Mi",
}
expectedLimits := map[corev1.ResourceName]string{
corev1.ResourceCPU: "1",
corev1.ResourceMemory: "512Mi",
}

for k, v := range expectedRequests {
qty := resources.Requests[k] // Copy value from map
if qty.String() != v {
t.Errorf("Expected request %s for %s, got %s", v, k, qty.String())
}
}

for k, v := range expectedLimits {
qty := resources.Limits[k] // Copy value from map
if qty.String() != v {
t.Errorf("Expected limit %s for %s, got %s", v, k, qty.String())
}
}
}
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