/
client.go
222 lines (193 loc) · 7.79 KB
/
client.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/*
Copyright 2017 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 metrics
import (
"context"
"fmt"
"time"
"k8s.io/klog/v2"
autoscaling "k8s.io/api/autoscaling/v2"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
customapi "k8s.io/metrics/pkg/apis/custom_metrics/v1beta2"
metricsapi "k8s.io/metrics/pkg/apis/metrics/v1beta1"
resourceclient "k8s.io/metrics/pkg/client/clientset/versioned/typed/metrics/v1beta1"
customclient "k8s.io/metrics/pkg/client/custom_metrics"
externalclient "k8s.io/metrics/pkg/client/external_metrics"
)
const (
metricServerDefaultMetricWindow = time.Minute
)
func NewRESTMetricsClient(resourceClient resourceclient.PodMetricsesGetter, customClient customclient.CustomMetricsClient, externalClient externalclient.ExternalMetricsClient) MetricsClient {
return &restMetricsClient{
&resourceMetricsClient{resourceClient},
&customMetricsClient{customClient},
&externalMetricsClient{externalClient},
}
}
// restMetricsClient is a client which supports fetching
// metrics from the resource metrics API, the
// custom metrics API and the external metrics API.
type restMetricsClient struct {
*resourceMetricsClient
*customMetricsClient
*externalMetricsClient
}
// resourceMetricsClient implements the resource-metrics-related parts of MetricsClient,
// using data from the resource metrics API.
type resourceMetricsClient struct {
client resourceclient.PodMetricsesGetter
}
// GetResourceMetric gets the given resource metric (and an associated oldest timestamp)
// for all pods matching the specified selector in the given namespace
func (c *resourceMetricsClient) GetResourceMetric(ctx context.Context, resource v1.ResourceName, namespace string, selector labels.Selector, container string) (PodMetricsInfo, time.Time, error) {
metrics, err := c.client.PodMetricses(namespace).List(ctx, metav1.ListOptions{LabelSelector: selector.String()})
if err != nil {
return nil, time.Time{}, fmt.Errorf("unable to fetch metrics from resource metrics API: %v", err)
}
if len(metrics.Items) == 0 {
return nil, time.Time{}, fmt.Errorf("no metrics returned from resource metrics API")
}
var res PodMetricsInfo
if container != "" {
res, err = getContainerMetrics(metrics.Items, resource, container)
if err != nil {
return nil, time.Time{}, fmt.Errorf("failed to get container metrics: %v", err)
}
} else {
res = getPodMetrics(ctx, metrics.Items, resource)
}
timestamp := metrics.Items[0].Timestamp.Time
return res, timestamp, nil
}
func getContainerMetrics(rawMetrics []metricsapi.PodMetrics, resource v1.ResourceName, container string) (PodMetricsInfo, error) {
res := make(PodMetricsInfo, len(rawMetrics))
for _, m := range rawMetrics {
containerFound := false
for _, c := range m.Containers {
if c.Name == container {
containerFound = true
if val, resFound := c.Usage[resource]; resFound {
res[m.Name] = PodMetric{
Timestamp: m.Timestamp.Time,
Window: m.Window.Duration,
Value: val.MilliValue(),
}
}
break
}
}
if !containerFound {
return nil, fmt.Errorf("container %s not present in metrics for pod %s/%s", container, m.Namespace, m.Name)
}
}
return res, nil
}
func getPodMetrics(ctx context.Context, rawMetrics []metricsapi.PodMetrics, resource v1.ResourceName) PodMetricsInfo {
res := make(PodMetricsInfo, len(rawMetrics))
for _, m := range rawMetrics {
podSum := int64(0)
missing := len(m.Containers) == 0
for _, c := range m.Containers {
resValue, found := c.Usage[resource]
if !found {
missing = true
klog.FromContext(ctx).V(2).Info("Missing resource metric", "resourceMetric", resource, "pod", klog.KRef(m.Namespace, m.Name))
break
}
podSum += resValue.MilliValue()
}
if !missing {
res[m.Name] = PodMetric{
Timestamp: m.Timestamp.Time,
Window: m.Window.Duration,
Value: podSum,
}
}
}
return res
}
// customMetricsClient implements the custom-metrics-related parts of MetricsClient,
// using data from the custom metrics API.
type customMetricsClient struct {
client customclient.CustomMetricsClient
}
// GetRawMetric gets the given metric (and an associated oldest timestamp)
// for all pods matching the specified selector in the given namespace
func (c *customMetricsClient) GetRawMetric(metricName string, namespace string, selector labels.Selector, metricSelector labels.Selector) (PodMetricsInfo, time.Time, error) {
metrics, err := c.client.NamespacedMetrics(namespace).GetForObjects(schema.GroupKind{Kind: "Pod"}, selector, metricName, metricSelector)
if err != nil {
return nil, time.Time{}, fmt.Errorf("unable to fetch metrics from custom metrics API: %v", err)
}
if len(metrics.Items) == 0 {
return nil, time.Time{}, fmt.Errorf("no metrics returned from custom metrics API")
}
res := make(PodMetricsInfo, len(metrics.Items))
for _, m := range metrics.Items {
window := metricServerDefaultMetricWindow
if m.WindowSeconds != nil {
window = time.Duration(*m.WindowSeconds) * time.Second
}
res[m.DescribedObject.Name] = PodMetric{
Timestamp: m.Timestamp.Time,
Window: window,
Value: int64(m.Value.MilliValue()),
}
m.Value.MilliValue()
}
timestamp := metrics.Items[0].Timestamp.Time
return res, timestamp, nil
}
// GetObjectMetric gets the given metric (and an associated timestamp) for the given
// object in the given namespace
func (c *customMetricsClient) GetObjectMetric(metricName string, namespace string, objectRef *autoscaling.CrossVersionObjectReference, metricSelector labels.Selector) (int64, time.Time, error) {
gvk := schema.FromAPIVersionAndKind(objectRef.APIVersion, objectRef.Kind)
var metricValue *customapi.MetricValue
var err error
if gvk.Kind == "Namespace" && gvk.Group == "" {
// handle namespace separately
// NB: we ignore namespace name here, since CrossVersionObjectReference isn't
// supposed to allow you to escape your namespace
metricValue, err = c.client.RootScopedMetrics().GetForObject(gvk.GroupKind(), namespace, metricName, metricSelector)
} else {
metricValue, err = c.client.NamespacedMetrics(namespace).GetForObject(gvk.GroupKind(), objectRef.Name, metricName, metricSelector)
}
if err != nil {
return 0, time.Time{}, fmt.Errorf("unable to fetch metrics from custom metrics API: %v", err)
}
return metricValue.Value.MilliValue(), metricValue.Timestamp.Time, nil
}
// externalMetricsClient implements the external metrics related parts of MetricsClient,
// using data from the external metrics API.
type externalMetricsClient struct {
client externalclient.ExternalMetricsClient
}
// GetExternalMetric gets all the values of a given external metric
// that match the specified selector.
func (c *externalMetricsClient) GetExternalMetric(metricName, namespace string, selector labels.Selector) ([]int64, time.Time, error) {
metrics, err := c.client.NamespacedMetrics(namespace).List(metricName, selector)
if err != nil {
return []int64{}, time.Time{}, fmt.Errorf("unable to fetch metrics from external metrics API: %v", err)
}
if len(metrics.Items) == 0 {
return nil, time.Time{}, fmt.Errorf("no metrics returned from external metrics API")
}
res := make([]int64, 0)
for _, m := range metrics.Items {
res = append(res, m.Value.MilliValue())
}
timestamp := metrics.Items[0].Timestamp.Time
return res, timestamp, nil
}