github.com/google/cadvisor@v0.49.1/collector/collector_manager_test.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  	"testing"
    19  	"time"
    20  
    21  	"github.com/stretchr/testify/assert"
    22  
    23  	v1 "github.com/google/cadvisor/info/v1"
    24  )
    25  
    26  type fakeCollector struct {
    27  	nextCollectionTime time.Time
    28  	err                error
    29  	collectedFrom      int
    30  }
    31  
    32  func (fc *fakeCollector) Collect(metric map[string][]v1.MetricVal) (time.Time, map[string][]v1.MetricVal, error) {
    33  	fc.collectedFrom++
    34  	return fc.nextCollectionTime, metric, fc.err
    35  }
    36  
    37  func (fc *fakeCollector) Name() string {
    38  	return "fake-collector"
    39  }
    40  
    41  func (fc *fakeCollector) GetSpec() []v1.MetricSpec {
    42  	return []v1.MetricSpec{}
    43  }
    44  
    45  func TestCollect(t *testing.T) {
    46  	cm := &GenericCollectorManager{}
    47  
    48  	firstTime := time.Now().Add(-time.Hour)
    49  	secondTime := time.Now().Add(time.Hour)
    50  	f1 := &fakeCollector{
    51  		nextCollectionTime: firstTime,
    52  	}
    53  	f2 := &fakeCollector{
    54  		nextCollectionTime: secondTime,
    55  	}
    56  
    57  	assert := assert.New(t)
    58  	assert.NoError(cm.RegisterCollector(f1))
    59  	assert.NoError(cm.RegisterCollector(f2))
    60  
    61  	// First collection, everyone gets collected from.
    62  	nextTime, _, err := cm.Collect()
    63  	assert.Equal(firstTime, nextTime)
    64  	assert.NoError(err)
    65  	assert.Equal(1, f1.collectedFrom)
    66  	assert.Equal(1, f2.collectedFrom)
    67  
    68  	f1.nextCollectionTime = time.Now().Add(2 * time.Hour)
    69  
    70  	// Second collection, only the one that is ready gets collected from.
    71  	nextTime, _, err = cm.Collect()
    72  	assert.Equal(secondTime, nextTime)
    73  	assert.NoError(err)
    74  	assert.Equal(2, f1.collectedFrom)
    75  	assert.Equal(1, f2.collectedFrom)
    76  }