/
provider.go
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/
provider.go
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package k8s
import (
"log"
"os"
cv1 "github.com/nearmap/cvmanager/gok8s/apis/custom/v1"
"github.com/nearmap/cvmanager/history"
"github.com/nearmap/cvmanager/stats"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes"
k8sscheme "k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/record"
)
// Resource maintains a high level status of deployments managed by
// CV resources including version of current deploy and number of available pods
// from this deployment/replicaset
type Resource struct {
Namespace string
Name string
Type string
Container string
Version string
AvailablePods int32
CV string
Tag string
}
type K8sProvider struct {
cs kubernetes.Interface
Recorder record.EventRecorder
Pod *v1.Pod
namespace string
hp history.Provider
recordHistory bool
stats stats.Stats
}
// NewK8sProvider abstracts operation performed against Kubernetes resources such as syncing deployments
// config maps etc
func NewK8sProvider(cs kubernetes.Interface, ns string, stats stats.Stats, recordHistory bool) *K8sProvider {
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(log.Printf)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: cs.CoreV1().Events("")})
var recorder record.EventRecorder
pod, err := cs.CoreV1().Pods(ns).Get(os.Getenv("INSTANCENAME"), metav1.GetOptions{})
if err != nil {
log.Print("No INSTANCENAME was set hence cant record events on pod.. falling back to using fake event recorder")
recorder = record.NewFakeRecorder(50)
} else {
recorder = eventBroadcaster.NewRecorder(k8sscheme.Scheme, corev1.EventSource{Component: "container-version-controller"})
}
return &K8sProvider{
cs: cs,
Recorder: recorder,
Pod: pod,
namespace: ns,
hp: history.NewProvider(cs, stats),
recordHistory: recordHistory,
stats: stats,
}
}
// SyncWorkload checks if container version of all workload that matches CV selector
// is up to date with the version thats requested, if not its
// performs a rollout with specified roll-out strategy on deployment
func (k *K8sProvider) SyncWorkload(cv *cv1.ContainerVersion, version string) error {
set := labels.Set(cv.Spec.Selector)
listOpts := metav1.ListOptions{LabelSelector: set.AsSelector().String()}
// Alpha workload
err := k.syncDeployments(cv, version, listOpts)
if err != nil {
errors.Wrap(err, "failed to sync deployments")
}
err = k.syncDaemonSets(cv, version, listOpts)
if err != nil {
errors.Wrap(err, "failed to sync syncDaemonSets")
}
err = k.syncReplicaSet(cv, version, listOpts)
if err != nil {
errors.Wrap(err, "failed to sync syncReplicaSets")
}
err = k.syncStatefulSet(cv, version, listOpts)
if err != nil {
errors.Wrap(err, "failed to sync syncStatefulSets")
}
// batch workloads
err = k.syncJobs(cv, version, listOpts)
if err != nil {
errors.Wrap(err, "failed to sync jobs")
}
err = k.syncCronJobs(cv, version, listOpts)
if err != nil {
errors.Wrap(err, "failed to sync cronjobs")
}
return err
}
// CVWorkload generates details about current workload resources managed by CVManager
func (k *K8sProvider) CVWorkload(cv *cv1.ContainerVersion) ([]*Resource, error) {
var cvsList []*Resource
set := labels.Set(cv.Spec.Selector)
listOpts := metav1.ListOptions{LabelSelector: set.AsSelector().String()}
// workloads
rs, err := k.cvDeployment(cv, listOpts)
if err != nil {
log.Printf("Error: %v", err)
return nil, errors.Errorf("Failed to fetch all Deployments managed by CV resources")
}
cvsList = append(cvsList, rs...)
rs, err = k.cvDaemonSets(cv, listOpts)
if err != nil {
log.Printf("Error: %v", err)
return nil, errors.Errorf("Failed to fetch all DaemonSets managed by CV resources")
}
cvsList = append(cvsList, rs...)
rs, err = k.cvStatefulSets(cv, listOpts)
if err != nil {
log.Printf("Error: %v", err)
return nil, errors.Errorf("Failed to fetch all StatefulSets managed by CV resources")
}
cvsList = append(cvsList, rs...)
rs, err = k.cvReplicaSets(cv, listOpts)
if err != nil {
log.Printf("Error: %v", err)
return nil, errors.Errorf("Failed to fetch all ReplicaSets managed by CV resources")
}
cvsList = append(cvsList, rs...)
// Batch workload
rs, err = k.cvCronJobs(cv, listOpts)
if err != nil {
log.Printf("Error: %v", err)
return nil, errors.Errorf("Failed to fetch all CronJobs managed by CV resources")
}
cvsList = append(cvsList, rs...)
rs, err = k.cvJobs(cv, listOpts)
if err != nil {
log.Printf("Error: %v", err)
return nil, errors.Errorf("Failed to fetch all Jobs managed by CV resources")
}
cvsList = append(cvsList, rs...)
return cvsList, nil
}
func (k *K8sProvider) validate(v string) error {
//TODO later regression check etc
return nil
}