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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 collector
import (
"fmt"
"strings"
"time"
"github.com/google/cadvisor/info/v1"
)
const metricLabelPrefix = "io.cadvisor.metric."
type GenericCollectorManager struct {
Collectors []*collectorData
NextCollectionTime time.Time
}
type collectorData struct {
collector Collector
nextCollectionTime time.Time
}
// Returns a new CollectorManager that is thread-compatible.
func NewCollectorManager() (CollectorManager, error) {
return &GenericCollectorManager{
Collectors: []*collectorData{},
NextCollectionTime: time.Now(),
}, nil
}
func GetCollectorConfigs(labels map[string]string) map[string]string {
configs := map[string]string{}
for k, v := range labels {
if strings.HasPrefix(k, metricLabelPrefix) {
name := strings.TrimPrefix(k, metricLabelPrefix)
configs[name] = v
}
}
return configs
}
func (cm *GenericCollectorManager) RegisterCollector(collector Collector) error {
cm.Collectors = append(cm.Collectors, &collectorData{
collector: collector,
nextCollectionTime: time.Now(),
})
return nil
}
func (cm *GenericCollectorManager) GetSpec() ([]v1.MetricSpec, error) {
metricSpec := []v1.MetricSpec{}
for _, c := range cm.Collectors {
specs := c.collector.GetSpec()
metricSpec = append(metricSpec, specs...)
}
return metricSpec, nil
}
func (cm *GenericCollectorManager) Collect() (time.Time, map[string][]v1.MetricVal, error) {
var errors []error
// Collect from all collectors that are ready.
var next time.Time
metrics := map[string][]v1.MetricVal{}
for _, c := range cm.Collectors {
if c.nextCollectionTime.Before(time.Now()) {
var err error
c.nextCollectionTime, metrics, err = c.collector.Collect(metrics)
if err != nil {
errors = append(errors, err)
}
}
// Keep track of the next collector that will be ready.
if next.IsZero() || next.After(c.nextCollectionTime) {
next = c.nextCollectionTime
}
}
cm.NextCollectionTime = next
return next, metrics, compileErrors(errors)
}
// Make an error slice into a single error.
func compileErrors(errors []error) error {
if len(errors) == 0 {
return nil
}
res := make([]string, len(errors))
for i := range errors {
res[i] = fmt.Sprintf("Error %d: %v", i, errors[i].Error())
}
return fmt.Errorf("%s", strings.Join(res, ","))
}
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