110 lines
2.9 KiB
Go
110 lines
2.9 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package collector
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import (
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"fmt"
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"strings"
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"time"
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"github.com/google/cadvisor/info/v1"
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)
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const metricLabelPrefix = "io.cadvisor.metric."
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type GenericCollectorManager struct {
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Collectors []*collectorData
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NextCollectionTime time.Time
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}
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type collectorData struct {
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collector Collector
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nextCollectionTime time.Time
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}
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// Returns a new CollectorManager that is thread-compatible.
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func NewCollectorManager() (CollectorManager, error) {
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return &GenericCollectorManager{
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Collectors: []*collectorData{},
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NextCollectionTime: time.Now(),
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}, nil
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}
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func GetCollectorConfigs(labels map[string]string) map[string]string {
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configs := map[string]string{}
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for k, v := range labels {
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if strings.HasPrefix(k, metricLabelPrefix) {
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name := strings.TrimPrefix(k, metricLabelPrefix)
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configs[name] = v
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}
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}
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return configs
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}
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func (cm *GenericCollectorManager) RegisterCollector(collector Collector) error {
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cm.Collectors = append(cm.Collectors, &collectorData{
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collector: collector,
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nextCollectionTime: time.Now(),
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})
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return nil
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}
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func (cm *GenericCollectorManager) GetSpec() ([]v1.MetricSpec, error) {
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metricSpec := []v1.MetricSpec{}
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for _, c := range cm.Collectors {
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specs := c.collector.GetSpec()
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metricSpec = append(metricSpec, specs...)
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}
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return metricSpec, nil
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}
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func (cm *GenericCollectorManager) Collect() (time.Time, map[string][]v1.MetricVal, error) {
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var errors []error
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// Collect from all collectors that are ready.
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var next time.Time
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metrics := map[string][]v1.MetricVal{}
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for _, c := range cm.Collectors {
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if c.nextCollectionTime.Before(time.Now()) {
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var err error
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c.nextCollectionTime, metrics, err = c.collector.Collect(metrics)
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if err != nil {
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errors = append(errors, err)
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}
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}
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// Keep track of the next collector that will be ready.
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if next.IsZero() || next.After(c.nextCollectionTime) {
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next = c.nextCollectionTime
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}
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}
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cm.NextCollectionTime = next
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return next, metrics, compileErrors(errors)
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}
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// Make an error slice into a single error.
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func compileErrors(errors []error) error {
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if len(errors) == 0 {
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return nil
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}
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res := make([]string, len(errors))
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for i := range errors {
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res[i] = fmt.Sprintf("Error %d: %v", i, errors[i].Error())
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}
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return fmt.Errorf("%s", strings.Join(res, ","))
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}
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