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resources.go
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resources.go
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package resources
import (
"fmt"
"math/rand"
"os"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/ptr"
"github.com/dejanzele/batch-simulator/internal/util"
)
const (
LabelKeyApp = "app"
LabelValueFakeJob = "fake-job"
LabelValueFakePod = "fake-pod"
LabelSelectorFakePod = LabelKeyApp + "=" + LabelValueFakePod
)
var (
// EnvVarCount is the number of envvars in a pod spec.
EnvVarCount = 5
// MaxEnvVarSize is the maximum size of an env var in bytes.
MaxEnvVarSize = 10 * 1024
// EnvVarsType is the type of env vars that should be used when creating fake pods (nano, micro, xsmall...).
EnvVarsType = newEnvVars(EnvVarCount, 2*1024, "SOME_ENV_VAR_MEDIUM")
)
func SetDefaultEnvVarsType(envVarType string) {
EnvVarsType = GetEnvVars(envVarType)
}
func GetEnvVars(envVarType string) []corev1.EnvVar {
switch envVarType {
case "nano":
return newEnvVars(EnvVarCount, 100, "SOME_ENV_VAR_NANO")
case "micro":
return newEnvVars(EnvVarCount, 200, "SOME_ENV_VAR_MICRO")
case "xsmall":
return newEnvVars(EnvVarCount, 500, "SOME_ENV_VAR_XSMALL")
case "small":
return newEnvVars(EnvVarCount, 1024, "SOME_ENV_VAR_SMALL")
case "medium":
return newEnvVars(EnvVarCount, 2*1024, "SOME_ENV_VAR_MEDIUM")
case "large":
return newEnvVars(EnvVarCount, 4*1024, "SOME_ENV_VAR_LARGE")
case "xlarge":
return newEnvVars(EnvVarCount, 8*1024, "SOME_ENV_VAR_XLARGE")
case "xlarge2":
return newEnvVars(EnvVarCount, 10*1024, "SOME_ENV_VAR_XLARGE2")
case "xlarge8":
return newEnvVars(EnvVarCount, 40*1024, "SOME_ENV_VAR_XLARGE8")
default:
return newEnvVars(EnvVarCount, 2*1024, "SOME_ENV_VAR_MEDIUM")
}
}
func GetRandomEnvVarType() []corev1.EnvVar {
size := 1 + rand.Intn(MaxEnvVarSize)
return newEnvVars(EnvVarCount, size, "SOME_ENV_VAR_RANDOM")
}
// newEnvVars creates a slice of envvars with the specified count and size.
func newEnvVars(count, size int, prefix string) []corev1.EnvVar {
envVars := make([]corev1.EnvVar, 0, count)
for i := 0; i < count; i++ {
envVars = append(envVars, newEnvVar(fmt.Sprintf("%s_%d", prefix, i), size))
}
return envVars
}
// newEnvVar creates a new envvar with the specified name and size.
func newEnvVar(name string, size int) corev1.EnvVar {
return corev1.EnvVar{
Name: name,
Value: util.RandomText(size),
}
}
// NewFakeNode creates a fake Kubernetes Node resource, managed by KWOK, with the specified name.
func NewFakeNode(nodeName string) *corev1.Node {
return &corev1.Node{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "Node",
},
ObjectMeta: metav1.ObjectMeta{
Name: nodeName,
Annotations: map[string]string{
"node.alpha.kubernetes.io/ttl": "0",
"kwok.x-k8s.io/node": "fake",
},
Labels: map[string]string{
"beta.kubernetes.io/arch": "amd64",
"beta.kubernetes.io/os": "linux",
"kubernetes.io/arch": "amd64",
"kubernetes.io/hostname": nodeName,
"kubernetes.io/os": "linux",
"kubernetes.io/role": "agent",
"node-role.kubernetes.io/agent": "",
"type": "kwok",
},
},
Spec: corev1.NodeSpec{
PodCIDR: "10.233.1.0/24",
PodCIDRs: []string{"10.233.1.0/24"},
Taints: []corev1.Taint{
{
Key: "kwok.x-k8s.io/node",
Value: "fake",
Effect: corev1.TaintEffectNoSchedule,
},
},
},
Status: corev1.NodeStatus{
Allocatable: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("20"),
corev1.ResourceMemory: resource.MustParse("256Gi"),
corev1.ResourcePods: resource.MustParse("110"),
},
Capacity: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("20"),
corev1.ResourceMemory: resource.MustParse("256Gi"),
corev1.ResourcePods: resource.MustParse("110"),
},
NodeInfo: corev1.NodeSystemInfo{
Architecture: "amd64",
BootID: "",
ContainerRuntimeVersion: "",
KernelVersion: "",
KubeProxyVersion: "fake",
KubeletVersion: "fake",
MachineID: "",
OperatingSystem: "linux",
OSImage: "",
SystemUUID: "",
},
Phase: corev1.NodeRunning,
},
}
}
// NewFakeJob creates a fake Kubernetes Job resource, managed by KWOK, with the specified name and namespace.
func NewFakeJob(name, namespace string, randomEnvVars bool) *batchv1.Job {
return &batchv1.Job{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "Job",
},
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: namespace,
Labels: map[string]string{
LabelKeyApp: LabelValueFakeJob,
"type": "kwok",
"created-by": getHostname(),
},
},
Spec: batchv1.JobSpec{
TTLSecondsAfterFinished: ptr.To[int32](30),
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: map[string]string{
LabelKeyApp: LabelValueFakePod,
"part-of": LabelValueFakeJob,
"created-by": getHostname(),
},
},
Spec: newPodSpec(randomEnvVars),
},
},
}
}
// NewFakePod creates a fake Kubernetes Pod resource, managed by KWOK, with the specified name and namespace.
func NewFakePod(name, namespace string, randomEnvVars bool) *corev1.Pod {
return &corev1.Pod{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "Pod",
},
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: namespace,
Labels: map[string]string{
LabelKeyApp: LabelValueFakePod,
"type": "kwok",
"created-by": getHostname(),
},
},
Spec: newPodSpec(randomEnvVars),
}
}
// newPodSpec creates a new pod spec.
// If randomEnvVars is true, a random envvar slice will be used, otherwise the default (large) envvar slice will be used.
func newPodSpec(randomEnvVars bool) corev1.PodSpec {
envVars := EnvVarsType
if randomEnvVars {
envVars = GetRandomEnvVarType()
}
podSpec := corev1.PodSpec{
RestartPolicy: corev1.RestartPolicyNever,
Affinity: newAffinity(),
Tolerations: []corev1.Toleration{
{
Key: "kwok.x-k8s.io/node",
Operator: corev1.TolerationOpExists,
Effect: corev1.TaintEffectNoSchedule,
},
},
Containers: []corev1.Container{
{
Name: "fake-container",
Image: "fake-image",
Env: envVars,
Resources: corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("1"),
},
},
},
},
}
return podSpec
}
// newAffinity creates a new affinity which matches nodes with the type kwok.
func newAffinity() *corev1.Affinity {
return &corev1.Affinity{
NodeAffinity: &corev1.NodeAffinity{
RequiredDuringSchedulingIgnoredDuringExecution: &corev1.NodeSelector{
NodeSelectorTerms: []corev1.NodeSelectorTerm{
{
MatchExpressions: []corev1.NodeSelectorRequirement{
{
Key: "type",
Operator: corev1.NodeSelectorOpIn,
Values: []string{"kwok"},
},
},
},
},
},
},
}
}
func getHostname() string {
hostname, _ := os.Hostname()
if hostname == "" {
hostname = "unknown"
}
return hostname
}