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metrics_client.go
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metrics_client.go
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/*
Copyright 2016 The Kubernetes Authors.
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.
*/
package metricsutil
import (
"encoding/json"
"errors"
"fmt"
metrics_api "k8s.io/heapster/metrics/apis/metrics/v1alpha1"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/api/validation"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/labels"
)
const (
DefaultHeapsterNamespace = "kube-system"
DefaultHeapsterScheme = "http"
DefaultHeapsterService = "heapster"
DefaultHeapsterPort = "" // use the first exposed port on the service
)
var (
prefix = "/apis"
groupVersion = fmt.Sprintf("%s/%s", metricsGv.Group, metricsGv.Version)
metricsRoot = fmt.Sprintf("%s/%s", prefix, groupVersion)
// TODO: get this from metrics api once it's finished
metricsGv = unversioned.GroupVersion{Group: "metrics", Version: "v1alpha1"}
)
type HeapsterMetricsClient struct {
*client.Client
HeapsterNamespace string
HeapsterScheme string
HeapsterService string
HeapsterPort string
}
func NewHeapsterMetricsClient(client *client.Client, namespace, scheme, service, port string) *HeapsterMetricsClient {
return &HeapsterMetricsClient{
Client: client,
HeapsterNamespace: namespace,
HeapsterScheme: scheme,
HeapsterService: service,
HeapsterPort: port,
}
}
func DefaultHeapsterMetricsClient(client *client.Client) *HeapsterMetricsClient {
return NewHeapsterMetricsClient(client, DefaultHeapsterNamespace, DefaultHeapsterScheme, DefaultHeapsterService, DefaultHeapsterPort)
}
func podMetricsUrl(namespace string, name string) (string, error) {
if namespace == api.NamespaceAll {
return fmt.Sprintf("%s/pods", metricsRoot), nil
}
errs := validation.ValidateNamespaceName(namespace, false)
if len(errs) > 0 {
message := fmt.Sprintf("invalid namespace: %s - %v", namespace, errs)
return "", errors.New(message)
}
if len(name) > 0 {
errs = validation.ValidatePodName(name, false)
if len(errs) > 0 {
message := fmt.Sprintf("invalid pod name: %s - %v", name, errs)
return "", errors.New(message)
}
}
return fmt.Sprintf("%s/namespaces/%s/pods/%s", metricsRoot, namespace, name), nil
}
func nodeMetricsUrl(name string) (string, error) {
if len(name) > 0 {
errs := validation.ValidateNodeName(name, false)
if len(errs) > 0 {
message := fmt.Sprintf("invalid node name: %s - %v", name, errs)
return "", errors.New(message)
}
}
return fmt.Sprintf("%s/nodes/%s", metricsRoot, name), nil
}
func (cli *HeapsterMetricsClient) GetNodeMetrics(nodeName string, selector labels.Selector) ([]metrics_api.NodeMetrics, error) {
params := map[string]string{"labelSelector": selector.String()}
path, err := nodeMetricsUrl(nodeName)
if err != nil {
return []metrics_api.NodeMetrics{}, err
}
resultRaw, err := GetHeapsterMetrics(cli, path, params)
if err != nil {
return []metrics_api.NodeMetrics{}, err
}
metrics := make([]metrics_api.NodeMetrics, 0)
if len(nodeName) == 0 {
metricsList := metrics_api.NodeMetricsList{}
err = json.Unmarshal(resultRaw, &metricsList)
if err != nil {
return []metrics_api.NodeMetrics{}, fmt.Errorf("failed to unmarshall heapster response: %v", err)
}
metrics = append(metrics, metricsList.Items...)
} else {
var singleMetric metrics_api.NodeMetrics
err = json.Unmarshal(resultRaw, &singleMetric)
if err != nil {
return []metrics_api.NodeMetrics{}, fmt.Errorf("failed to unmarshall heapster response: %v", err)
}
metrics = append(metrics, singleMetric)
}
return metrics, nil
}
func (cli *HeapsterMetricsClient) GetPodMetrics(namespace string, podName string, allNamespaces bool, selector labels.Selector) ([]metrics_api.PodMetrics, error) {
if allNamespaces {
namespace = api.NamespaceAll
}
path, err := podMetricsUrl(namespace, podName)
if err != nil {
return []metrics_api.PodMetrics{}, err
}
params := map[string]string{"labelSelector": selector.String()}
allMetrics := make([]metrics_api.PodMetrics, 0)
resultRaw, err := GetHeapsterMetrics(cli, path, params)
if err != nil {
return []metrics_api.PodMetrics{}, err
}
if len(podName) == 0 {
metrics := metrics_api.PodMetricsList{}
err = json.Unmarshal(resultRaw, &metrics)
if err != nil {
return []metrics_api.PodMetrics{}, fmt.Errorf("failed to unmarshall heapster response: %v", err)
}
allMetrics = append(allMetrics, metrics.Items...)
} else {
var singleMetric metrics_api.PodMetrics
err = json.Unmarshal(resultRaw, &singleMetric)
if err != nil {
return []metrics_api.PodMetrics{}, fmt.Errorf("failed to unmarshall heapster response: %v", err)
}
allMetrics = append(allMetrics, singleMetric)
}
return allMetrics, nil
}
func GetHeapsterMetrics(cli *HeapsterMetricsClient, path string, params map[string]string) ([]byte, error) {
return cli.Services(cli.HeapsterNamespace).
ProxyGet(cli.HeapsterScheme, cli.HeapsterService, cli.HeapsterPort, path, params).
DoRaw()
}