mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-06 09:47:54 +00:00
3727f99343
Moving it into its own type to better organize and separate concerns. Also makes unit testing easier.
83 lines
2.7 KiB
Go
83 lines
2.7 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package provider
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import (
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"fmt"
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"time"
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"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
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apimeta "k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/client-go/dynamic"
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"k8s.io/metrics/pkg/apis/external_metrics"
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prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
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)
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type externalPrometheusProvider struct {
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mapper apimeta.RESTMapper
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kubeClient dynamic.Interface
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promClient prom.Client
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queryBuilder ExternalMetricQueryBuilder
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SeriesRegistry
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}
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func NewExternalPrometheusProvider(mapper apimeta.RESTMapper, kubeClient dynamic.Interface, promClient prom.Client, namers []MetricNamer, updateInterval time.Duration, queryBuilder ExternalMetricQueryBuilder) (provider.ExternalMetricsProvider, Runnable) {
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lister := &cachingMetricsLister{
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updateInterval: updateInterval,
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promClient: promClient,
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namers: namers,
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SeriesRegistry: &basicSeriesRegistry{
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mapper: mapper,
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},
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}
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return &externalPrometheusProvider{
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mapper: mapper,
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kubeClient: kubeClient,
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promClient: promClient,
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SeriesRegistry: lister,
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}, lister
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}
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func (p *externalPrometheusProvider) GetExternalMetric(namespace string, metricName string, metricSelector labels.Selector) (*external_metrics.ExternalMetricValueList, error) {
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//TODO: Steps
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//1. Generate a Prometheus Query.
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// Something like my_metric{namespace="namespace" some_label="some_value"}
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//2. Send that query to Prometheus.
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//3. Adapt the results.
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//The query generation for external metrics is much more straightforward
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//than for custom metrics because no renaming is applied.
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//So we'll just start with some simple string operations and see how far that gets us.
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//Then I'll circle back and figure out how much code reuse I can get out of the original implementation.
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query := p.queryBuilder.BuildPrometheusQuery(namespace, metricName, metricSelector)
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//TODO: Only here to stop compiler issues in this incomplete code.
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fmt.Printf(query)
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//TODO: Construct a real result.
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return nil, nil
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}
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func (p *externalPrometheusProvider) ListAllExternalMetrics() []provider.ExternalMetricInfo {
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//TODO: Provide a real response.
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return nil
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}
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