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refactor common 'k8s' package; up cli mod; docs
* bump minor-minor versions: 3.21.1 aistore, 1.8.1 CLI * cmn/k8s - substantial refactoring (part two) * docs: add 'rotate logs' example Signed-off-by: Alex Aizman <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Package k8s: initialization, client, and misc. helpers | ||
| /* | ||
| * Copyright (c) 2018-2023, NVIDIA CORPORATION. All rights reserved. | ||
| */ | ||
| package k8s | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
|
|
||
| "github.com/NVIDIA/aistore/cmn/cos" | ||
| "github.com/NVIDIA/aistore/cmn/debug" | ||
| "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| metrics "k8s.io/metrics/pkg/client/clientset/versioned" | ||
| ) | ||
|
|
||
| type metricsClient struct { | ||
| client *metrics.Clientset | ||
| err error | ||
| } | ||
|
|
||
| var ( | ||
| once sync.Once | ||
| _mc *metricsClient | ||
| ) | ||
|
|
||
| func InitMetricsClient() { once.Do(_initmc) } | ||
|
|
||
| func _initmc() { | ||
| config, err := clientcmd.BuildConfigFromFlags("", "") | ||
| if err != nil { | ||
| _mc = &metricsClient{ | ||
| err: fmt.Errorf("failed to retrieve metrics client config: %w", err), | ||
| } | ||
| return | ||
| } | ||
| mc, err := metrics.NewForConfig(config) | ||
| if err != nil { | ||
| _mc = &metricsClient{ | ||
| err: fmt.Errorf("failed to create metrics client: %w", err), | ||
| } | ||
| return | ||
| } | ||
| _mc = &metricsClient{ | ||
| client: mc, | ||
| } | ||
| } | ||
|
|
||
| func Metrics(podName string) (float64 /*cores*/, int64 /*mem*/, error) { | ||
| var ( | ||
| totalCPU, totalMem int64 | ||
| fracCPU float64 | ||
| ) | ||
| if _mc.err != nil { | ||
| return 0, 0, _mc.err | ||
| } | ||
| debug.Assert(_mc.client != nil) | ||
|
|
||
| var ( | ||
| mc = _mc.client | ||
| msgetter = mc.MetricsV1beta1().PodMetricses(metav1.NamespaceDefault) | ||
| ms, err = msgetter.Get(context.Background(), podName, metav1.GetOptions{}) | ||
| ) | ||
| if err != nil { | ||
| if statusErr, ok := err.(*errors.StatusError); ok && statusErr.Status().Reason == metav1.StatusReasonNotFound { | ||
| err = cos.NewErrNotFound("metrics for pod %q", podName) | ||
| } | ||
| return 0, 0, err | ||
| } | ||
|
|
||
| for _, metric := range ms.Containers { | ||
| cpuNanoCores, ok := metric.Usage.Cpu().AsInt64() | ||
| if !ok { | ||
| cpuNanoCores = metric.Usage.Cpu().AsDec().UnscaledBig().Int64() | ||
| } | ||
| totalCPU += cpuNanoCores | ||
|
|
||
| memInt, ok := metric.Usage.Memory().AsInt64() | ||
| if !ok { | ||
| memInt = metric.Usage.Memory().AsDec().UnscaledBig().Int64() | ||
| } | ||
| totalMem += memInt | ||
| } | ||
|
|
||
| // Kubernetes reports CPU in nanocores, see https://godoc.org/k8s.io/api/core/v1#ResourceName | ||
| fracCPU = float64(totalCPU) / float64(1_000_000_000) | ||
| return fracCPU, totalMem, nil | ||
| } |
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