telegraf/plugins/inputs/cloudwatch/cloudwatch_test.go

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package cloudwatch
import (
"testing"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/cloudwatch"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/assert"
)
type mockGatherCloudWatchClient struct{}
func (m *mockGatherCloudWatchClient) ListMetrics(params *cloudwatch.ListMetricsInput) (*cloudwatch.ListMetricsOutput, error) {
metric := &cloudwatch.Metric{
Namespace: params.Namespace,
MetricName: aws.String("Latency"),
Dimensions: []*cloudwatch.Dimension{
&cloudwatch.Dimension{
Name: aws.String("LoadBalancerName"),
Value: aws.String("p-example"),
},
},
}
result := &cloudwatch.ListMetricsOutput{
Metrics: []*cloudwatch.Metric{metric},
}
return result, nil
}
func (m *mockGatherCloudWatchClient) GetMetricStatistics(params *cloudwatch.GetMetricStatisticsInput) (*cloudwatch.GetMetricStatisticsOutput, error) {
dataPoint := &cloudwatch.Datapoint{
Timestamp: params.EndTime,
Minimum: aws.Float64(0.1),
Maximum: aws.Float64(0.3),
Average: aws.Float64(0.2),
Sum: aws.Float64(123),
SampleCount: aws.Float64(100),
Unit: aws.String("Seconds"),
}
result := &cloudwatch.GetMetricStatisticsOutput{
Label: aws.String("Latency"),
Datapoints: []*cloudwatch.Datapoint{dataPoint},
}
return result, nil
}
func TestGather(t *testing.T) {
duration, _ := time.ParseDuration("1m")
internalDuration := internal.Duration{
Duration: duration,
}
c := &CloudWatch{
Region: "us-east-1",
Namespace: "AWS/ELB",
Delay: internalDuration,
Period: internalDuration,
RateLimit: 200,
}
var acc testutil.Accumulator
c.client = &mockGatherCloudWatchClient{}
c.Gather(&acc)
fields := map[string]interface{}{}
fields["latency_minimum"] = 0.1
fields["latency_maximum"] = 0.3
fields["latency_average"] = 0.2
fields["latency_sum"] = 123.0
fields["latency_sample_count"] = 100.0
tags := map[string]string{}
tags["unit"] = "seconds"
tags["region"] = "us-east-1"
tags["load_balancer_name"] = "p-example"
assert.True(t, acc.HasMeasurement("cloudwatch_aws_elb"))
acc.AssertContainsTaggedFields(t, "cloudwatch_aws_elb", fields, tags)
}
type mockSelectMetricsCloudWatchClient struct{}
func (m *mockSelectMetricsCloudWatchClient) ListMetrics(params *cloudwatch.ListMetricsInput) (*cloudwatch.ListMetricsOutput, error) {
metrics := []*cloudwatch.Metric{}
// 4 metrics are available
metricNames := []string{"Latency", "RequestCount", "HealthyHostCount", "UnHealthyHostCount"}
// for 3 ELBs
loadBalancers := []string{"lb-1", "lb-2", "lb-3"}
// in 2 AZs
availabilityZones := []string{"us-east-1a", "us-east-1b"}
for _, m := range metricNames {
for _, lb := range loadBalancers {
// For each metric/ELB pair, we get an aggregate value across all AZs.
metrics = append(metrics, &cloudwatch.Metric{
Namespace: aws.String("AWS/ELB"),
MetricName: aws.String(m),
Dimensions: []*cloudwatch.Dimension{
&cloudwatch.Dimension{
Name: aws.String("LoadBalancerName"),
Value: aws.String(lb),
},
},
})
for _, az := range availabilityZones {
// We get a metric for each metric/ELB/AZ triplet.
metrics = append(metrics, &cloudwatch.Metric{
Namespace: aws.String("AWS/ELB"),
MetricName: aws.String(m),
Dimensions: []*cloudwatch.Dimension{
&cloudwatch.Dimension{
Name: aws.String("LoadBalancerName"),
Value: aws.String(lb),
},
&cloudwatch.Dimension{
Name: aws.String("AvailabilityZone"),
Value: aws.String(az),
},
},
})
}
}
}
result := &cloudwatch.ListMetricsOutput{
Metrics: metrics,
}
return result, nil
}
func (m *mockSelectMetricsCloudWatchClient) GetMetricStatistics(params *cloudwatch.GetMetricStatisticsInput) (*cloudwatch.GetMetricStatisticsOutput, error) {
return nil, nil
}
func TestSelectMetrics(t *testing.T) {
duration, _ := time.ParseDuration("1m")
internalDuration := internal.Duration{
Duration: duration,
}
c := &CloudWatch{
Region: "us-east-1",
Namespace: "AWS/ELB",
Delay: internalDuration,
Period: internalDuration,
RateLimit: 200,
Metrics: []*Metric{
&Metric{
MetricNames: []string{"Latency", "RequestCount"},
Dimensions: []*Dimension{
&Dimension{
Name: "LoadBalancerName",
Value: "*",
},
&Dimension{
Name: "AvailabilityZone",
Value: "*",
},
},
},
},
}
c.client = &mockSelectMetricsCloudWatchClient{}
metrics, err := SelectMetrics(c)
// We've asked for 2 (out of 4) metrics, over all 3 load balancers in all 2
// AZs. We should get 12 metrics.
assert.Equal(t, 12, len(metrics))
assert.Nil(t, err)
}
func TestGenerateStatisticsInputParams(t *testing.T) {
d := &cloudwatch.Dimension{
Name: aws.String("LoadBalancerName"),
Value: aws.String("p-example"),
}
m := &cloudwatch.Metric{
MetricName: aws.String("Latency"),
Dimensions: []*cloudwatch.Dimension{d},
}
duration, _ := time.ParseDuration("1m")
internalDuration := internal.Duration{
Duration: duration,
}
c := &CloudWatch{
Namespace: "AWS/ELB",
Delay: internalDuration,
Period: internalDuration,
}
c.initializeCloudWatch()
now := time.Now()
params := c.getStatisticsInput(m, now)
assert.EqualValues(t, *params.EndTime, now.Add(-c.Delay.Duration))
assert.EqualValues(t, *params.StartTime, now.Add(-c.Period.Duration).Add(-c.Delay.Duration))
assert.Len(t, params.Dimensions, 1)
assert.Len(t, params.Statistics, 5)
assert.EqualValues(t, *params.Period, 60)
}
func TestMetricsCacheTimeout(t *testing.T) {
cache := &MetricCache{
Metrics: []*cloudwatch.Metric{},
Fetched: time.Now(),
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TTL: time.Minute,
}
assert.True(t, cache.IsValid())
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cache.Fetched = time.Now().Add(-time.Minute)
assert.False(t, cache.IsValid())
}