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profiler.go
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profiler.go
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/*
* This file is part of the KubeVirt project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2018 Red Hat, Inc.
*
*/
package kubecli
import (
"context"
"encoding/json"
"fmt"
"net/url"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/rest"
v1 "kubevirt.io/api/core/v1"
)
func (k *kubevirt) ClusterProfiler() *ClusterProfiler {
return &ClusterProfiler{
restClient: k.restClient,
resource: "cluster-profiler",
}
}
type ClusterProfiler struct {
restClient *rest.RESTClient
resource string
}
func (v *ClusterProfiler) preferredVersion() (string, error) {
var group metav1.APIGroup
// First, find out which version to query
uri := ApiGroupName
result := v.restClient.Get().AbsPath(uri).Do(context.Background())
if data, err := result.Raw(); err != nil {
connErr, isConnectionErr := err.(*url.Error)
if isConnectionErr {
return "", connErr.Err
}
return "", err
} else if err = json.Unmarshal(data, &group); err != nil {
return "", err
}
return group.PreferredVersion.GroupVersion, nil
}
func (v *ClusterProfiler) Start() error {
preferredVersion, err := v.preferredVersion()
if err != nil {
return err
}
// Now, query the preferred version
uri := fmt.Sprintf("/apis/%s/start-cluster-profiler", preferredVersion)
return v.restClient.Get().AbsPath(uri).Do(context.Background()).Error()
}
func (v *ClusterProfiler) Stop() error {
preferredVersion, err := v.preferredVersion()
if err != nil {
return fmt.Errorf("error encountered while detecting preferred version: %v", err)
}
// Now, query the preferred version
uri := fmt.Sprintf("/apis/%s/stop-cluster-profiler", preferredVersion)
return v.restClient.Get().AbsPath(uri).Do(context.Background()).Error()
}
// Dump returns at most cpRequest.PageSize profiler results. To fetch results from all kubevirt pods
// Dump should be called with Continue fields set to Continue field value from the response to a previous request.
// This should be repeated until Continue or ComponentsResult field in ClusterProfilerResponse is empty.
func (v *ClusterProfiler) Dump(cpRequest *v1.ClusterProfilerRequest) (*v1.ClusterProfilerResults, error) {
preferredVersion, err := v.preferredVersion()
if err != nil {
return nil, err
}
if cpRequest == nil {
return nil, fmt.Errorf("request body can't be nil")
}
bytes, err := json.Marshal(cpRequest)
if err != nil {
return nil, err
}
// Now, query the preferred version
uri := fmt.Sprintf("/apis/%s/dump-cluster-profiler", preferredVersion)
var profileResults v1.ClusterProfilerResults
result := v.restClient.Get().AbsPath(uri).Body(bytes).Do(context.Background())
if data, err := result.Raw(); err != nil {
connErr, isConnectionErr := err.(*url.Error)
if isConnectionErr {
return nil, connErr.Err
}
return nil, err
} else if len(data) == 0 {
return &profileResults, nil
} else if err = json.Unmarshal(data, &profileResults); err != nil {
return nil, err
}
return &profileResults, nil
}