github.com/google/cadvisor@v0.49.1/collector/collector_manager.go (about)

     1  // Copyright 2015 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package collector
    16  
    17  import (
    18  	"fmt"
    19  	"strings"
    20  	"time"
    21  
    22  	v1 "github.com/google/cadvisor/info/v1"
    23  )
    24  
    25  const metricLabelPrefix = "io.cadvisor.metric."
    26  
    27  type GenericCollectorManager struct {
    28  	Collectors         []*collectorData
    29  	NextCollectionTime time.Time
    30  }
    31  
    32  type collectorData struct {
    33  	collector          Collector
    34  	nextCollectionTime time.Time
    35  }
    36  
    37  // Returns a new CollectorManager that is thread-compatible.
    38  func NewCollectorManager() (CollectorManager, error) {
    39  	return &GenericCollectorManager{
    40  		Collectors:         []*collectorData{},
    41  		NextCollectionTime: time.Now(),
    42  	}, nil
    43  }
    44  
    45  func GetCollectorConfigs(labels map[string]string) map[string]string {
    46  	configs := map[string]string{}
    47  	for k, v := range labels {
    48  		if strings.HasPrefix(k, metricLabelPrefix) {
    49  			name := strings.TrimPrefix(k, metricLabelPrefix)
    50  			configs[name] = v
    51  		}
    52  	}
    53  	return configs
    54  }
    55  
    56  func (cm *GenericCollectorManager) RegisterCollector(collector Collector) error {
    57  	cm.Collectors = append(cm.Collectors, &collectorData{
    58  		collector:          collector,
    59  		nextCollectionTime: time.Now(),
    60  	})
    61  	return nil
    62  }
    63  
    64  func (cm *GenericCollectorManager) GetSpec() ([]v1.MetricSpec, error) {
    65  	metricSpec := []v1.MetricSpec{}
    66  	for _, c := range cm.Collectors {
    67  		specs := c.collector.GetSpec()
    68  		metricSpec = append(metricSpec, specs...)
    69  	}
    70  
    71  	return metricSpec, nil
    72  }
    73  
    74  func (cm *GenericCollectorManager) Collect() (time.Time, map[string][]v1.MetricVal, error) {
    75  	var errors []error
    76  
    77  	// Collect from all collectors that are ready.
    78  	var next time.Time
    79  	metrics := map[string][]v1.MetricVal{}
    80  	for _, c := range cm.Collectors {
    81  		if c.nextCollectionTime.Before(time.Now()) {
    82  			var err error
    83  			c.nextCollectionTime, metrics, err = c.collector.Collect(metrics)
    84  			if err != nil {
    85  				errors = append(errors, err)
    86  			}
    87  		}
    88  
    89  		// Keep track of the next collector that will be ready.
    90  		if next.IsZero() || next.After(c.nextCollectionTime) {
    91  			next = c.nextCollectionTime
    92  		}
    93  	}
    94  	cm.NextCollectionTime = next
    95  	return next, metrics, compileErrors(errors)
    96  }
    97  
    98  // Make an error slice into a single error.
    99  func compileErrors(errors []error) error {
   100  	if len(errors) == 0 {
   101  		return nil
   102  	}
   103  
   104  	res := make([]string, len(errors))
   105  	for i := range errors {
   106  		res[i] = fmt.Sprintf("Error %d: %v", i, errors[i].Error())
   107  	}
   108  	return fmt.Errorf("%s", strings.Join(res, ","))
   109  }