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forked from virtual-kubelet/virtual-kubelet
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mock.go
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mock.go
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package mock
import (
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"math/rand"
"time"
"github.com/cpuguy83/strongerrors"
"github.com/cpuguy83/strongerrors/status/ocstatus"
"github.com/virtual-kubelet/virtual-kubelet/log"
"github.com/virtual-kubelet/virtual-kubelet/trace"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/remotecommand"
stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
"github.com/virtual-kubelet/virtual-kubelet/providers"
)
const (
// Provider configuration defaults.
defaultCPUCapacity = "20"
defaultMemoryCapacity = "100Gi"
defaultPodCapacity = "20"
// Values used in tracing as attribute keys.
namespaceKey = "namespace"
nameKey = "name"
containerNameKey = "containerName"
)
// MockProvider implements the virtual-kubelet provider interface and stores pods in memory.
type MockProvider struct {
nodeName string
operatingSystem string
internalIP string
daemonEndpointPort int32
pods map[string]*v1.Pod
config MockConfig
startTime time.Time
}
// MockConfig contains a mock virtual-kubelet's configurable parameters.
type MockConfig struct {
CPU string `json:"cpu,omitempty"`
Memory string `json:"memory,omitempty"`
Pods string `json:"pods,omitempty"`
}
// NewMockProvider creates a new MockProvider
func NewMockProvider(providerConfig, nodeName, operatingSystem string, internalIP string, daemonEndpointPort int32) (*MockProvider, error) {
config, err := loadConfig(providerConfig, nodeName)
if err != nil {
return nil, err
}
provider := MockProvider{
nodeName: nodeName,
operatingSystem: operatingSystem,
internalIP: internalIP,
daemonEndpointPort: daemonEndpointPort,
pods: make(map[string]*v1.Pod),
config: config,
startTime: time.Now(),
}
return &provider, nil
}
// loadConfig loads the given json configuration files.
func loadConfig(providerConfig, nodeName string) (config MockConfig, err error) {
data, err := ioutil.ReadFile(providerConfig)
if err != nil {
return config, err
}
configMap := map[string]MockConfig{}
err = json.Unmarshal(data, &configMap)
if err != nil {
return config, err
}
if _, exist := configMap[nodeName]; exist {
config = configMap[nodeName]
if config.CPU == "" {
config.CPU = defaultCPUCapacity
}
if config.Memory == "" {
config.Memory = defaultMemoryCapacity
}
if config.Pods == "" {
config.Pods = defaultPodCapacity
}
}
if _, err = resource.ParseQuantity(config.CPU); err != nil {
return config, fmt.Errorf("Invalid CPU value %v", config.CPU)
}
if _, err = resource.ParseQuantity(config.Memory); err != nil {
return config, fmt.Errorf("Invalid memory value %v", config.Memory)
}
if _, err = resource.ParseQuantity(config.Pods); err != nil {
return config, fmt.Errorf("Invalid pods value %v", config.Pods)
}
return config, nil
}
// CreatePod accepts a Pod definition and stores it in memory.
func (p *MockProvider) CreatePod(ctx context.Context, pod *v1.Pod) error {
ctx, span := trace.StartSpan(ctx, "CreatePod")
defer span.End()
// Add the pod's coordinates to the current span.
ctx = addAttributes(ctx, span, namespaceKey, pod.Namespace, nameKey, pod.Name)
log.G(ctx).Info("receive CreatePod %q", pod.Name)
key, err := buildKey(pod)
if err != nil {
return err
}
p.pods[key] = pod
return nil
}
// UpdatePod accepts a Pod definition and updates its reference.
func (p *MockProvider) UpdatePod(ctx context.Context, pod *v1.Pod) error {
ctx, span := trace.StartSpan(ctx, "UpdatePod")
defer span.End()
// Add the pod's coordinates to the current span.
ctx = addAttributes(ctx, span, namespaceKey, pod.Namespace, nameKey, pod.Name)
log.G(ctx).Info("receive UpdatePod %q", pod.Name)
key, err := buildKey(pod)
if err != nil {
return err
}
p.pods[key] = pod
return nil
}
// DeletePod deletes the specified pod out of memory.
func (p *MockProvider) DeletePod(ctx context.Context, pod *v1.Pod) (err error) {
ctx, span := trace.StartSpan(ctx, "DeletePod")
defer span.End()
// Add the pod's coordinates to the current span.
ctx = addAttributes(ctx, span, namespaceKey, pod.Namespace, nameKey, pod.Name)
log.G(ctx).Info("receive DeletePod %q", pod.Name)
key, err := buildKey(pod)
if err != nil {
return err
}
if _, exists := p.pods[key]; !exists {
return strongerrors.NotFound(fmt.Errorf("pod not found"))
}
delete(p.pods, key)
return nil
}
// GetPod returns a pod by name that is stored in memory.
func (p *MockProvider) GetPod(ctx context.Context, namespace, name string) (pod *v1.Pod, err error) {
ctx, span := trace.StartSpan(ctx, "GetPod")
defer func() {
span.SetStatus(ocstatus.FromError(err))
span.End()
}()
// Add the pod's coordinates to the current span.
ctx = addAttributes(ctx, span, namespaceKey, namespace, nameKey, name)
log.G(ctx).Info("receive GetPod %q", name)
key, err := buildKeyFromNames(namespace, name)
if err != nil {
return nil, err
}
if pod, ok := p.pods[key]; ok {
return pod, nil
}
return nil, strongerrors.NotFound(fmt.Errorf("pod \"%s/%s\" is not known to the provider", namespace, name))
}
// GetContainerLogs retrieves the logs of a container by name from the provider.
func (p *MockProvider) GetContainerLogs(ctx context.Context, namespace, podName, containerName string, tail int) (string, error) {
ctx, span := trace.StartSpan(ctx, "GetContainerLogs")
defer span.End()
// Add pod and container attributes to the current span.
ctx = addAttributes(ctx, span, namespaceKey, namespace, nameKey, podName, containerNameKey, containerName)
log.G(ctx).Info("receive GetContainerLogs %q", podName)
return "", nil
}
// Get full pod name as defined in the provider context
// TODO: Implementation
func (p *MockProvider) GetPodFullName(namespace string, pod string) string {
return ""
}
// ExecInContainer executes a command in a container in the pod, copying data
// between in/out/err and the container's stdin/stdout/stderr.
func (p *MockProvider) ExecInContainer(name string, uid types.UID, container string, cmd []string, in io.Reader, out, err io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error {
log.G(context.TODO()).Info("receive ExecInContainer %q", container)
return nil
}
// GetPodStatus returns the status of a pod by name that is "running".
// returns nil if a pod by that name is not found.
func (p *MockProvider) GetPodStatus(ctx context.Context, namespace, name string) (*v1.PodStatus, error) {
ctx, span := trace.StartSpan(ctx, "GetPodStatus")
defer span.End()
// Add namespace and name as attributes to the current span.
ctx = addAttributes(ctx, span, namespaceKey, namespace, nameKey, name)
log.G(ctx).Info("receive GetPodStatus %q", name)
now := metav1.NewTime(time.Now())
status := &v1.PodStatus{
Phase: v1.PodRunning,
HostIP: "1.2.3.4",
PodIP: "5.6.7.8",
StartTime: &now,
Conditions: []v1.PodCondition{
{
Type: v1.PodInitialized,
Status: v1.ConditionTrue,
},
{
Type: v1.PodReady,
Status: v1.ConditionTrue,
},
{
Type: v1.PodScheduled,
Status: v1.ConditionTrue,
},
},
}
pod, err := p.GetPod(ctx, namespace, name)
if err != nil {
return nil, err
}
for _, container := range pod.Spec.Containers {
status.ContainerStatuses = append(status.ContainerStatuses, v1.ContainerStatus{
Name: container.Name,
Image: container.Image,
Ready: true,
RestartCount: 0,
State: v1.ContainerState{
Running: &v1.ContainerStateRunning{
StartedAt: now,
},
},
})
}
return status, nil
}
// GetPods returns a list of all pods known to be "running".
func (p *MockProvider) GetPods(ctx context.Context) ([]*v1.Pod, error) {
ctx, span := trace.StartSpan(ctx, "GetPods")
defer span.End()
log.G(ctx).Info("receive GetPods")
var pods []*v1.Pod
for _, pod := range p.pods {
pods = append(pods, pod)
}
return pods, nil
}
// Capacity returns a resource list containing the capacity limits.
func (p *MockProvider) Capacity(ctx context.Context) v1.ResourceList {
ctx, span := trace.StartSpan(ctx, "Capacity")
defer span.End()
return v1.ResourceList{
"cpu": resource.MustParse(p.config.CPU),
"memory": resource.MustParse(p.config.Memory),
"pods": resource.MustParse(p.config.Pods),
}
}
// NodeConditions returns a list of conditions (Ready, OutOfDisk, etc), for updates to the node status
// within Kubernetes.
func (p *MockProvider) NodeConditions(ctx context.Context) []v1.NodeCondition {
ctx, span := trace.StartSpan(ctx, "NodeConditions")
defer span.End()
// TODO: Make this configurable
return []v1.NodeCondition{
{
Type: "Ready",
Status: v1.ConditionTrue,
LastHeartbeatTime: metav1.Now(),
LastTransitionTime: metav1.Now(),
Reason: "KubeletReady",
Message: "kubelet is ready.",
},
{
Type: "OutOfDisk",
Status: v1.ConditionFalse,
LastHeartbeatTime: metav1.Now(),
LastTransitionTime: metav1.Now(),
Reason: "KubeletHasSufficientDisk",
Message: "kubelet has sufficient disk space available",
},
{
Type: "MemoryPressure",
Status: v1.ConditionFalse,
LastHeartbeatTime: metav1.Now(),
LastTransitionTime: metav1.Now(),
Reason: "KubeletHasSufficientMemory",
Message: "kubelet has sufficient memory available",
},
{
Type: "DiskPressure",
Status: v1.ConditionFalse,
LastHeartbeatTime: metav1.Now(),
LastTransitionTime: metav1.Now(),
Reason: "KubeletHasNoDiskPressure",
Message: "kubelet has no disk pressure",
},
{
Type: "NetworkUnavailable",
Status: v1.ConditionFalse,
LastHeartbeatTime: metav1.Now(),
LastTransitionTime: metav1.Now(),
Reason: "RouteCreated",
Message: "RouteController created a route",
},
}
}
// NodeAddresses returns a list of addresses for the node status
// within Kubernetes.
func (p *MockProvider) NodeAddresses(ctx context.Context) []v1.NodeAddress {
ctx, span := trace.StartSpan(ctx, "NodeAddresses")
defer span.End()
return []v1.NodeAddress{
{
Type: "InternalIP",
Address: p.internalIP,
},
}
}
// NodeDaemonEndpoints returns NodeDaemonEndpoints for the node status
// within Kubernetes.
func (p *MockProvider) NodeDaemonEndpoints(ctx context.Context) *v1.NodeDaemonEndpoints {
ctx, span := trace.StartSpan(ctx, "NodeDaemonEndpoints")
defer span.End()
return &v1.NodeDaemonEndpoints{
KubeletEndpoint: v1.DaemonEndpoint{
Port: p.daemonEndpointPort,
},
}
}
// OperatingSystem returns the operating system for this provider.
// This is a noop to default to Linux for now.
func (p *MockProvider) OperatingSystem() string {
return providers.OperatingSystemLinux
}
// GetStatsSummary returns dummy stats for all pods known by this provider.
func (p *MockProvider) GetStatsSummary(ctx context.Context) (*stats.Summary, error) {
ctx, span := trace.StartSpan(ctx, "GetStatsSummary")
defer span.End()
// Grab the current timestamp so we can report it as the time the stats were generated.
time := metav1.NewTime(time.Now())
// Create the Summary object that will later be populated with node and pod stats.
res := &stats.Summary{}
// Populate the Summary object with basic node stats.
res.Node = stats.NodeStats{
NodeName: p.nodeName,
StartTime: metav1.NewTime(p.startTime),
}
// Populate the Summary object with dummy stats for each pod known by this provider.
for _, pod := range p.pods {
var (
// totalUsageNanoCores will be populated with the sum of the values of UsageNanoCores computes across all containers in the pod.
totalUsageNanoCores uint64
// totalUsageBytes will be populated with the sum of the values of UsageBytes computed across all containers in the pod.
totalUsageBytes uint64
)
// Create a PodStats object to populate with pod stats.
pss := stats.PodStats{
PodRef: stats.PodReference{
Name: pod.Name,
Namespace: pod.Namespace,
UID: string(pod.UID),
},
StartTime: pod.CreationTimestamp,
}
// Iterate over all containers in the current pod to compute dummy stats.
for _, container := range pod.Spec.Containers {
// Grab a dummy value to be used as the total CPU usage.
// The value should fit a uint32 in order to avoid overflows later on when computing pod stats.
dummyUsageNanoCores := uint64(rand.Uint32())
totalUsageNanoCores += dummyUsageNanoCores
// Create a dummy value to be used as the total RAM usage.
// The value should fit a uint32 in order to avoid overflows later on when computing pod stats.
dummyUsageBytes := uint64(rand.Uint32())
totalUsageBytes += dummyUsageBytes
// Append a ContainerStats object containing the dummy stats to the PodStats object.
pss.Containers = append(pss.Containers, stats.ContainerStats{
Name: container.Name,
StartTime: pod.CreationTimestamp,
CPU: &stats.CPUStats{
Time: time,
UsageNanoCores: &dummyUsageNanoCores,
},
Memory: &stats.MemoryStats{
Time: time,
UsageBytes: &dummyUsageBytes,
},
})
}
// Populate the CPU and RAM stats for the pod and append the PodsStats object to the Summary object to be returned.
pss.CPU = &stats.CPUStats{
Time: time,
UsageNanoCores: &totalUsageNanoCores,
}
pss.Memory = &stats.MemoryStats{
Time: time,
UsageBytes: &totalUsageBytes,
}
res.Pods = append(res.Pods, pss)
}
// Return the dummy stats.
return res, nil
}
func buildKeyFromNames(namespace string, name string) (string, error) {
return fmt.Sprintf("%s-%s", namespace, name), nil
}
// buildKey is a helper for building the "key" for the providers pod store.
func buildKey(pod *v1.Pod) (string, error) {
if pod.ObjectMeta.Namespace == "" {
return "", fmt.Errorf("pod namespace not found")
}
if pod.ObjectMeta.Name == "" {
return "", fmt.Errorf("pod name not found")
}
return buildKeyFromNames(pod.ObjectMeta.Namespace, pod.ObjectMeta.Name)
}
// addAttributes adds the specified attributes to the provided span.
// attrs must be an even-sized list of string arguments.
// Otherwise, the span won't be modified.
// TODO: Refactor and move to a "tracing utilities" package.
func addAttributes(ctx context.Context, span trace.Span, attrs ...string) context.Context {
if len(attrs)%2 == 1 {
return ctx
}
for i := 0; i < len(attrs); i += 2 {
ctx = span.WithField(ctx, attrs[i], attrs[i+1])
}
return ctx
}