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collector.go
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collector.go
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package collector
import (
"context"
"fmt"
"time"
log "github.com/sirupsen/logrus"
"github.com/zalando-incubator/kube-metrics-adapter/pkg/annotations"
autoscalingv2 "k8s.io/api/autoscaling/v2"
"k8s.io/metrics/pkg/apis/custom_metrics"
"k8s.io/metrics/pkg/apis/external_metrics"
)
const (
typeLabelKey = "type"
)
type ObjectReference struct {
autoscalingv2.CrossVersionObjectReference
Namespace string
}
type CollectorFactory struct {
podsPlugins pluginMap
objectPlugins objectPluginMap
externalPlugins map[string]CollectorPlugin
logger *log.Entry
}
type objectPluginMap struct {
Any pluginMap
Named map[string]*pluginMap
}
type pluginMap struct {
Any CollectorPlugin
Named map[string]CollectorPlugin
}
func NewCollectorFactory() *CollectorFactory {
return &CollectorFactory{
podsPlugins: pluginMap{Named: map[string]CollectorPlugin{}},
objectPlugins: objectPluginMap{
Any: pluginMap{},
Named: map[string]*pluginMap{},
},
externalPlugins: map[string]CollectorPlugin{},
logger: log.WithFields(log.Fields{"collector": "true"}),
}
}
type CollectorPlugin interface {
NewCollector(ctx context.Context, hpa *autoscalingv2.HorizontalPodAutoscaler, config *MetricConfig, interval time.Duration) (Collector, error)
}
type PluginNotFoundError struct {
metricTypeName MetricTypeName
}
func (p *PluginNotFoundError) Error() string {
return fmt.Sprintf("no plugin found for %s", p.metricTypeName)
}
func (p *PluginNotFoundError) Is(target error) bool {
_, ok := target.(*PluginNotFoundError)
return ok
}
func (c *CollectorFactory) RegisterPodsCollector(metricCollector string, plugin CollectorPlugin) error {
if metricCollector == "" {
c.podsPlugins.Any = plugin
} else {
c.podsPlugins.Named[metricCollector] = plugin
}
return nil
}
func (c *CollectorFactory) RegisterObjectCollector(kind, metricCollector string, plugin CollectorPlugin) error {
if kind == "" {
if metricCollector == "" {
c.objectPlugins.Any.Any = plugin
} else {
if c.objectPlugins.Any.Named == nil {
c.objectPlugins.Any.Named = map[string]CollectorPlugin{
metricCollector: plugin,
}
} else {
c.objectPlugins.Any.Named[metricCollector] = plugin
}
}
} else {
if named, ok := c.objectPlugins.Named[kind]; ok {
if metricCollector == "" {
named.Any = plugin
} else {
named.Named[metricCollector] = plugin
}
} else {
if metricCollector == "" {
c.objectPlugins.Named[kind] = &pluginMap{
Any: plugin,
}
} else {
c.objectPlugins.Named[kind] = &pluginMap{
Named: map[string]CollectorPlugin{
metricCollector: plugin,
},
}
}
}
}
return nil
}
func (c *CollectorFactory) RegisterExternalCollector(metrics []string, plugin CollectorPlugin) {
for _, metric := range metrics {
c.externalPlugins[metric] = plugin
}
}
func (c *CollectorFactory) NewCollector(ctx context.Context, hpa *autoscalingv2.HorizontalPodAutoscaler, config *MetricConfig, interval time.Duration) (Collector, error) {
switch config.Type {
case autoscalingv2.PodsMetricSourceType:
// first try to find a plugin by format
if plugin, ok := c.podsPlugins.Named[config.CollectorType]; ok {
return plugin.NewCollector(ctx, hpa, config, interval)
}
// else try to use the default plugin if set
if c.podsPlugins.Any != nil {
return c.podsPlugins.Any.NewCollector(ctx, hpa, config, interval)
}
case autoscalingv2.ObjectMetricSourceType:
// first try to find a plugin by kind
if kinds, ok := c.objectPlugins.Named[config.ObjectReference.Kind]; ok {
if plugin, ok := kinds.Named[config.CollectorType]; ok {
return plugin.NewCollector(ctx, hpa, config, interval)
}
if kinds.Any != nil {
return kinds.Any.NewCollector(ctx, hpa, config, interval)
}
break
}
// else try to find a default plugin for this kind
if plugin, ok := c.objectPlugins.Any.Named[config.CollectorType]; ok {
return plugin.NewCollector(ctx, hpa, config, interval)
}
if c.objectPlugins.Any.Any != nil {
return c.objectPlugins.Any.Any.NewCollector(ctx, hpa, config, interval)
}
case autoscalingv2.ExternalMetricSourceType:
// First type to get metric type from the `type` label,
// otherwise fall back to the legacy metric name based mapping.
var pluginKey string
if config.Metric.Selector != nil && config.Metric.Selector.MatchLabels != nil {
if typ, ok := config.Metric.Selector.MatchLabels[typeLabelKey]; ok {
pluginKey = typ
}
}
if pluginKey == "" {
pluginKey = config.Metric.Name
c.logger.Warnf("HPA %s/%s is using deprecated metric type identifier '%s'", hpa.Namespace, hpa.Name, config.Metric.Name)
}
if plugin, ok := c.externalPlugins[pluginKey]; ok {
return plugin.NewCollector(ctx, hpa, config, interval)
}
}
return nil, &PluginNotFoundError{metricTypeName: config.MetricTypeName}
}
type MetricTypeName struct {
Type autoscalingv2.MetricSourceType
Metric autoscalingv2.MetricIdentifier
}
type CollectedMetric struct {
Type autoscalingv2.MetricSourceType
Namespace string
Custom custom_metrics.MetricValue
External external_metrics.ExternalMetricValue
}
type Collector interface {
GetMetrics(ctx context.Context) ([]CollectedMetric, error)
Interval() time.Duration
}
type MetricConfig struct {
MetricTypeName
CollectorType string
Config map[string]string
ObjectReference custom_metrics.ObjectReference
PerReplica bool
Interval time.Duration
MinPodReadyAge time.Duration
MetricSpec autoscalingv2.MetricSpec
}
// ParseHPAMetrics parses the HPA object into a list of metric configurations.
func ParseHPAMetrics(hpa *autoscalingv2.HorizontalPodAutoscaler) ([]*MetricConfig, error) {
metricConfigs := make([]*MetricConfig, 0, len(hpa.Spec.Metrics))
// TODO: validate that the specified metric names are defined
// in the HPA
parser := make(annotations.AnnotationConfigMap)
err := parser.Parse(hpa.Annotations)
if err != nil {
return nil, err
}
for _, metric := range hpa.Spec.Metrics {
typeName := MetricTypeName{
Type: metric.Type,
}
var ref custom_metrics.ObjectReference
switch metric.Type {
case autoscalingv2.PodsMetricSourceType:
typeName.Metric = metric.Pods.Metric
case autoscalingv2.ObjectMetricSourceType:
typeName.Metric = metric.Object.Metric
ref = custom_metrics.ObjectReference{
APIVersion: metric.Object.DescribedObject.APIVersion,
Kind: metric.Object.DescribedObject.Kind,
Name: metric.Object.DescribedObject.Name,
Namespace: hpa.Namespace,
}
case autoscalingv2.ExternalMetricSourceType:
typeName.Metric = metric.External.Metric
case autoscalingv2.ResourceMetricSourceType, autoscalingv2.ContainerResourceMetricSourceType:
continue // kube-metrics-adapter does not collect resource or container resource metrics
}
config := &MetricConfig{
MetricTypeName: typeName,
ObjectReference: ref,
Config: map[string]string{},
MetricSpec: metric,
}
if metric.Type == autoscalingv2.ExternalMetricSourceType &&
metric.External.Metric.Selector != nil {
for k, v := range metric.External.Metric.Selector.MatchLabels {
config.Config[k] = v
}
}
if metric.Type == autoscalingv2.ObjectMetricSourceType &&
metric.Object.Metric.Selector != nil {
for k, v := range metric.Object.Metric.Selector.MatchLabels {
config.Config[k] = v
}
}
annotationConfigs, present := parser.GetAnnotationConfig(typeName.Metric.Name, typeName.Type)
if present {
config.CollectorType = annotationConfigs.CollectorType
config.Interval = annotationConfigs.Interval
config.PerReplica = annotationConfigs.PerReplica
config.MinPodReadyAge = annotationConfigs.MinPodReadyAge
// configs specified in annotations takes precedence
// over labels
for k, v := range annotationConfigs.Configs {
config.Config[k] = v
}
}
metricConfigs = append(metricConfigs, config)
}
return metricConfigs, nil
}