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Decouple vkubelet/* packages from providers (#626)

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This makes the concept of a `Provider` wholely implemented in the cli
implementation in cmd/virtual-kubelet.

It allows us to slim down the interfaces used in vkubelet (and
vkubelet/api) to what is actually used there rather than a huge
interface that is only there to serve the CLI's needs.
This commit is contained in:
Brian Goff
2019-05-17 17:01:05 -07:00
committed by GitHub
parent 87e72bf4df
commit 7dd49516d8
26 changed files with 217 additions and 194 deletions
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60
providers/provider.go
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@@ -3,38 +3,23 @@ package providers
import (
"context"
"io"
"time"
"github.com/virtual-kubelet/virtual-kubelet/vkubelet"
"github.com/virtual-kubelet/virtual-kubelet/vkubelet/api"
v1 "k8s.io/api/core/v1"
stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
)
// Provider contains the methods required to implement a virtual-kubelet provider.
type Provider interface {
// CreatePod takes a Kubernetes Pod and deploys it within the provider.
CreatePod(ctx context.Context, pod *v1.Pod) error
// UpdatePod takes a Kubernetes Pod and updates it within the provider.
UpdatePod(ctx context.Context, pod *v1.Pod) error
// DeletePod takes a Kubernetes Pod and deletes it from the provider.
DeletePod(ctx context.Context, pod *v1.Pod) error
// GetPod retrieves a pod by name from the provider (can be cached).
GetPod(ctx context.Context, namespace, name string) (*v1.Pod, error)
vkubelet.PodLifecycleHandler
// GetContainerLogs retrieves the logs of a container by name from the provider.
GetContainerLogs(ctx context.Context, namespace, podName, containerName string, opts ContainerLogOpts) (io.ReadCloser, error)
GetContainerLogs(ctx context.Context, namespace, podName, containerName string, opts api.ContainerLogOpts) (io.ReadCloser, error)
// RunInContainer executes a command in a container in the pod, copying data
// between in/out/err and the container's stdin/stdout/stderr.
RunInContainer(ctx context.Context, namespace, podName, containerName string, cmd []string, attach AttachIO) error
// GetPodStatus retrieves the status of a pod by name from the provider.
GetPodStatus(ctx context.Context, namespace, name string) (*v1.PodStatus, error)
// GetPods retrieves a list of all pods running on the provider (can be cached).
GetPods(context.Context) ([]*v1.Pod, error)
RunInContainer(ctx context.Context, namespace, podName, containerName string, cmd []string, attach api.AttachIO) error
// Capacity returns a resource list with the capacity constraints of the provider.
Capacity(context.Context) v1.ResourceList
@@ -55,42 +40,7 @@ type Provider interface {
OperatingSystem() string
}
// ContainerLogOpts are used to pass along options to be set on the container
// log stream.
type ContainerLogOpts struct {
Tail int
Since time.Duration
LimitBytes int
Timestamps bool
}
// PodMetricsProvider is an optional interface that providers can implement to expose pod stats
type PodMetricsProvider interface {
GetStatsSummary(context.Context) (*stats.Summary, error)
}
// PodNotifier notifies callers of pod changes.
// Providers should implement this interface to enable callers to be notified
// of pod status updates asyncronously.
type PodNotifier interface {
// NotifyPods instructs the notifier to call the passed in function when
// the pod status changes.
//
// NotifyPods should not block callers.
NotifyPods(context.Context, func(*v1.Pod))
}
// AttachIO is used to pass in streams to attach to a container process
type AttachIO interface {
Stdin() io.Reader
Stdout() io.WriteCloser
Stderr() io.WriteCloser
TTY() bool
Resize() <-chan TermSize
}
// TermSize is used to set the terminal size from attached clients.
type TermSize struct {
Width uint16
Height uint16
}