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collector.go
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collector.go
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// Copyright 2022 The kubegems.io 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 exporter
import (
"errors"
"fmt"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"kubegems.io/kubegems/pkg/log"
)
var (
// Namespace defines the common namespace to be used by all metrics.
namespace = "gems_server"
scrapeDurationDesc *prometheus.Desc
scrapeSuccessDesc *prometheus.Desc
)
func getNamespace() string {
return namespace
}
func setNamespace(ns string) {
namespace = ns
scrapeSuccessDesc = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "scrape", "collector_success"),
"node_exporter: Whether a collector succeeded.",
[]string{"collector"},
nil,
)
scrapeDurationDesc = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "scrape", "collector_duration_seconds"),
"node_exporter: Duration of a collector scrape.",
[]string{"collector"},
nil,
)
}
type Collectorfunc func(logger *log.Logger) (Collector, error)
func registerCollector(collector string, factory Collectorfunc) {
flag := true
collectorState[collector] = &flag
factories[collector] = factory
}
var (
factories = make(map[string]Collectorfunc)
initiatedCollectorsMtx = sync.Mutex{}
initiatedCollectors = make(map[string]Collector)
collectorState = make(map[string]*bool)
)
// Collector is the interface a collector has to implement.
type Collector interface {
// Get new metrics and expose them via prometheus registry.
Update(ch chan<- prometheus.Metric) error
}
// BaseCollector implements the prometheus.Collector interface.
type BaseCollector struct {
Collectors map[string]Collector
logger *log.Logger
}
func GetInitiatedCollectors() map[string]Collector {
return initiatedCollectors
}
// newBaseCollector creates a new ServerCollector.
func newBaseCollector(logger *log.Logger, filters ...string) (*BaseCollector, error) {
f := make(map[string]bool)
for _, filter := range filters {
enabled, exist := collectorState[filter]
if !exist {
return nil, fmt.Errorf("missing collector: %s", filter)
}
if !*enabled {
return nil, fmt.Errorf("disabled collector: %s", filter)
}
f[filter] = true
}
collectors := make(map[string]Collector)
initiatedCollectorsMtx.Lock()
defer initiatedCollectorsMtx.Unlock()
for key, enabled := range collectorState {
if !*enabled || (len(f) > 0 && !f[key]) {
continue
}
if collector, ok := initiatedCollectors[key]; ok {
collectors[key] = collector
} else {
collector, err := factories[key](logger.With("collector", key))
if err != nil {
return nil, err
}
collectors[key] = collector
initiatedCollectors[key] = collector
}
}
return &BaseCollector{Collectors: collectors, logger: logger}, nil
}
// Describe implements the prometheus.Collector interface.
func (n BaseCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- scrapeDurationDesc
ch <- scrapeSuccessDesc
}
// Collect implements the prometheus.Collector interface.
func (n BaseCollector) Collect(ch chan<- prometheus.Metric) {
wg := sync.WaitGroup{}
wg.Add(len(n.Collectors))
for name, c := range n.Collectors {
go func(name string, c Collector) {
execute(name, c, ch, n.logger)
wg.Done()
}(name, c)
}
wg.Wait()
}
func execute(name string, c Collector, ch chan<- prometheus.Metric, logger *log.Logger) {
begin := time.Now()
err := c.Update(ch)
duration := time.Since(begin)
var success float64
if err != nil {
if IsNoDataError(err) {
logger.Debugf("collector returned no data, name: %s, duration_seconds: %f, err: %v", name, duration.Seconds(), err)
} else {
logger.Errorf("collector failed, name: %s, duration_seconds %f, err: %v", name, duration.Seconds(), err)
}
success = 0
} else {
logger.Debugf("collector succeeded, name: %s, duration_seconds %f", name, duration.Seconds())
success = 1
}
ch <- prometheus.MustNewConstMetric(scrapeDurationDesc, prometheus.GaugeValue, duration.Seconds(), name)
ch <- prometheus.MustNewConstMetric(scrapeSuccessDesc, prometheus.GaugeValue, success, name)
}
// ErrNoData indicates the collector found no data to collect, but had no other error.
var ErrNoData = errors.New("collector returned no data")
func IsNoDataError(err error) bool {
return err == ErrNoData
}