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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library") | ||
|
|
||
| go_library( | ||
| name = "scaler", | ||
| srcs = [ | ||
| "deployments.go", | ||
| "statefulSets.go", | ||
| ], | ||
| importpath = "github.com/jdewinne/k8s-dev-scaler/scaler", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "@io_k8s_apimachinery//pkg/apis/meta/v1:meta", | ||
| "@io_k8s_apimachinery//pkg/types", | ||
| "@io_k8s_client_go//kubernetes", | ||
| "@io_k8s_client_go//kubernetes/typed/apps/v1:apps", | ||
| ], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package scaler | ||
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "strconv" | ||
|
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| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| "k8s.io/client-go/kubernetes" | ||
| v1 "k8s.io/client-go/kubernetes/typed/apps/v1" | ||
| ) | ||
|
|
||
| // DeploymentsScaler allows to scale up or down all deployments | ||
| type DeploymentsScaler struct { | ||
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| // defining struct variables | ||
| client v1.DeploymentInterface | ||
| namespace string | ||
| scale string | ||
| } | ||
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| // NewDeploymentsScaler instantiates | ||
| func NewDeploymentsScaler(client kubernetes.Interface, namespace string, scale string) *DeploymentsScaler { | ||
| p := new(DeploymentsScaler) | ||
| p.client = client.AppsV1().Deployments(namespace) | ||
| p.namespace = namespace | ||
| p.scale = scale | ||
| return p | ||
| } | ||
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| func (ds *DeploymentsScaler) annotateResource(name string, replicas int32) error { | ||
| payload := fmt.Sprintf(`{"metadata":{"annotations":{"k8s.dev.scaler/desired.replicas":"%d"}}}`, replicas) | ||
| _, err := ds.client.Patch(context.TODO(), name, types.MergePatchType, []byte(payload), metav1.PatchOptions{}) | ||
| return err | ||
| } | ||
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| func (ds *DeploymentsScaler) getDesiredReplicas(name string) (int32, error) { | ||
| deployment, err := ds.client.Get(context.TODO(), name, metav1.GetOptions{}) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| replicas, _ := strconv.Atoi(deployment.Annotations["k8s.dev.scaler/desired.replicas"]) | ||
| return int32(replicas), nil | ||
| } | ||
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| // ScaleDeploymentResources will scale all deployments up or down in a namespace | ||
| func (ds *DeploymentsScaler) ScaleDeploymentResources() { | ||
| resources, err := ds.client.List(context.TODO(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| for _, r := range resources.Items { | ||
| // store original desired number of replicas as an annotation | ||
| if ds.scale == "down" { | ||
| err = ds.annotateResource(r.Name, *r.Spec.Replicas) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| } | ||
| // If scaling up, get the replicas from the previously stored annotation | ||
| replicas := int32(0) | ||
| if ds.scale == "up" { | ||
| replicas, err = ds.getDesiredReplicas(r.Name) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| } | ||
| fmt.Printf(" * Scaling %s (%d to %d replicas)\n", r.Name, *r.Spec.Replicas, replicas) | ||
| opts, err := ds.client.GetScale(context.TODO(), r.Name, metav1.GetOptions{}) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| opts.Spec.Replicas = replicas | ||
| ds.client.UpdateScale(context.TODO(), r.Name, opts, metav1.UpdateOptions{}) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package scaler | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "strconv" | ||
|
|
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| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| "k8s.io/client-go/kubernetes" | ||
| v1 "k8s.io/client-go/kubernetes/typed/apps/v1" | ||
| ) | ||
|
|
||
| // StatefulSetsScaler allows to scale up or down all statefulSets | ||
| type StatefulSetsScaler struct { | ||
|
|
||
| // defining struct variables | ||
| client v1.StatefulSetInterface | ||
| namespace string | ||
| scale string | ||
| } | ||
|
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| // NewStatefulSetsScaler instantiates | ||
| func NewStatefulSetsScaler(client kubernetes.Interface, namespace string, scale string) *StatefulSetsScaler { | ||
| p := new(StatefulSetsScaler) | ||
| p.client = client.AppsV1().StatefulSets(namespace) | ||
| p.namespace = namespace | ||
| p.scale = scale | ||
| return p | ||
| } | ||
|
|
||
| // annotateResource places the k8s.dev.scaler/desired.replicas annotation | ||
| func (ss *StatefulSetsScaler) annotateResource(name string, replicas int32) error { | ||
| payload := fmt.Sprintf(`{"metadata":{"annotations":{"k8s.dev.scaler/desired.replicas":"%d"}}}`, replicas) | ||
| _, err := ss.client.Patch(context.TODO(), name, types.MergePatchType, []byte(payload), metav1.PatchOptions{}) | ||
| return err | ||
| } | ||
|
|
||
| // getDesiredReplicas fetches the value from the k8s.dev.scaler/desired.replicas annotation | ||
| func (ss *StatefulSetsScaler) getDesiredReplicas(name string) (int32, error) { | ||
| statefulSet, err := ss.client.Get(context.TODO(), name, metav1.GetOptions{}) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| replicas, _ := strconv.Atoi(statefulSet.Annotations["k8s.dev.scaler/desired.replicas"]) | ||
| return int32(replicas), nil | ||
| } | ||
|
|
||
| // ScaleStatefulSetResources will scale all deployments up or down in a namespace | ||
| func (ss *StatefulSetsScaler) ScaleStatefulSetResources() { | ||
| resources, err := ss.client.List(context.TODO(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| for _, r := range resources.Items { | ||
| // store original desired number of replicas as an annotation | ||
| if ss.scale == "down" { | ||
| err = ss.annotateResource(r.Name, *r.Spec.Replicas) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| } | ||
| // If scaling up, get the replicas from the previously stored annotation | ||
| replicas := int32(0) | ||
| if ss.scale == "up" { | ||
| replicas, err = ss.getDesiredReplicas(r.Name) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
| } | ||
| fmt.Printf(" * Scaling %s (%d to %d replicas)\n", r.Name, *r.Spec.Replicas, replicas) | ||
| opts, err := ss.client.GetScale(context.TODO(), r.Name, metav1.GetOptions{}) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| opts.Spec.Replicas = replicas | ||
| ss.client.UpdateScale(context.TODO(), r.Name, opts, metav1.UpdateOptions{}) | ||
| } | ||
| } |