mirror of https://github.com/knative/pkg.git
136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
/*
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Copyright 2018 The Knative 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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https://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 prometheus
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import (
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"context"
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"errors"
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"fmt"
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"sync"
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"time"
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"github.com/prometheus/client_golang/api"
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v1 "github.com/prometheus/client_golang/api/prometheus/v1"
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"github.com/prometheus/common/model"
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"k8s.io/client-go/kubernetes"
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"knative.dev/pkg/test/logging"
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"knative.dev/pkg/test/monitoring"
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)
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const (
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prometheusPort = 9090
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appLabel = "prometheus"
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)
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var (
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// sync.Once variable to ensure we execute zipkin setup only once.
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setupOnce sync.Once
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// sync.Once variable to ensure we execute zipkin cleanup only if zipkin is setup and it is executed only once.
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teardownOnce sync.Once
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)
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// PromProxy defines a proxy to the prometheus server
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type PromProxy struct {
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Namespace string
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processID int
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}
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// Setup performs a port forwarding for app prometheus-test in given namespace
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func (p *PromProxy) Setup(kubeClientset *kubernetes.Clientset, logf logging.FormatLogger) {
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setupOnce.Do(func() {
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if err := monitoring.CheckPortAvailability(prometheusPort); err != nil {
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logf("Prometheus port not available: %v", err)
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return
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}
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promPods, err := monitoring.GetPods(kubeClientset, appLabel, p.Namespace)
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if err != nil {
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logf("Error retrieving prometheus pod details: %v", err)
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return
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}
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p.processID, err = monitoring.PortForward(logf, promPods, prometheusPort, prometheusPort, p.Namespace)
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if err != nil {
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logf("Error starting kubectl port-forward command: %v", err)
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return
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}
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})
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}
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// Teardown will kill the port forwarding process if running.
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func (p *PromProxy) Teardown(logf logging.FormatLogger) {
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teardownOnce.Do(func() {
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if err := monitoring.Cleanup(p.processID); err != nil {
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logf("Encountered error killing port-forward process: %v", err)
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return
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}
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})
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}
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// PromAPI gets a handle to the prometheus API
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func PromAPI() (v1.API, error) {
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client, err := api.NewClient(api.Config{Address: fmt.Sprintf("http://localhost:%d", prometheusPort)})
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if err != nil {
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return nil, err
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}
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return v1.NewAPI(client), nil
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}
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// AllowPrometheusSync sleeps for sometime to allow prometheus time to scrape the metrics.
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func AllowPrometheusSync(logf logging.FormatLogger) {
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logf("Sleeping to allow prometheus to record metrics...")
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time.Sleep(30 * time.Second)
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}
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// RunQuery runs a prometheus query and returns the metric value
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func RunQuery(ctx context.Context, logf logging.FormatLogger, promAPI v1.API, query string) (float64, error) {
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logf("Running prometheus query: %s", query)
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value, err := promAPI.Query(ctx, query, time.Now())
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if err != nil {
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return 0, err
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}
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return VectorValue(value)
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}
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// RunQueryRange runs a prometheus query over the given range
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func RunQueryRange(ctx context.Context, logf logging.FormatLogger, promAPI v1.API, query string, r v1.Range) (float64, error) {
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logf("Running prometheus query: %s", query)
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value, err := promAPI.QueryRange(ctx, query, r)
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if err != nil {
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return 0, err
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}
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return VectorValue(value)
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}
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// VectorValue gets the vector value from the value type
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func VectorValue(val model.Value) (float64, error) {
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if val.Type() != model.ValVector {
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return 0, fmt.Errorf("Value type is %s. Expected: Valvector", val.String())
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}
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value := val.(model.Vector)
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if len(value) == 0 {
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return 0, errors.New("Query returned no results")
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}
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return float64(value[0].Value), nil
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}
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