Add CloudWatch input plugin
Rebased commit of previously reviewed branch. Added cloudwatch client Mock and more rich unit tests. closes #935 closes #936
This commit is contained in:
Josh Hardy
Cameron Sparr
parent
e19c474a92
commit
d5b9e003fe
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@ -3,6 +3,7 @@
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### Features
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- [#976](https://github.com/influxdata/telegraf/pull/976): Reduce allocations in the UDP and statsd inputs.
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- [#979](https://github.com/influxdata/telegraf/pull/979): Reduce allocations in the TCP listener.
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- [#935](https://github.com/influxdata/telegraf/pull/935): AWS Cloudwatch input plugin. Thanks @joshhardy & @ljosa!
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### Bugfixes
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- [#968](https://github.com/influxdata/telegraf/issues/968): Processes plugin gets unknown state when spaces are in (command name)
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@ -4,6 +4,7 @@ import (
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_ "github.com/influxdata/telegraf/plugins/inputs/aerospike"
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_ "github.com/influxdata/telegraf/plugins/inputs/apache"
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_ "github.com/influxdata/telegraf/plugins/inputs/bcache"
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_ "github.com/influxdata/telegraf/plugins/inputs/cloudwatch"
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_ "github.com/influxdata/telegraf/plugins/inputs/couchbase"
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_ "github.com/influxdata/telegraf/plugins/inputs/couchdb"
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_ "github.com/influxdata/telegraf/plugins/inputs/disque"
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# Amazon CloudWatch Statistics Input
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This plugin will pull Metric Statistics from Amazon CloudWatch.
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### Amazon Authentication
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This plugin uses a credential chain for Authentication with the CloudWatch
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API endpoint. In the following order the plugin will attempt to authenticate.
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1. [IAMS Role](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html)
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2. [Environment Variables](https://github.com/aws/aws-sdk-go/wiki/configuring-sdk#environment-variables)
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3. [Shared Credentials](https://github.com/aws/aws-sdk-go/wiki/configuring-sdk#shared-credentials-file)
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### Configuration:
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```toml
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[[inputs.cloudwatch]]
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## Amazon Region (required)
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region = 'us-east-1'
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## Requested CloudWatch aggregation Period (required - must be a multiple of 60s)
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period = '1m'
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## Collection Delay (required - must account for metrics availability via CloudWatch API)
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delay = '1m'
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## Override global run interval (optional - defaults to global interval)
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## Recomended: use metric 'interval' that is a multiple of 'period' to avoid
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## gaps or overlap in pulled data
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interval = '1m'
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## Metric Statistic Namespace (required)
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namespace = 'AWS/ELB'
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## Metrics to Pull (optional)
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## Defaults to all Metrics in Namespace if nothing is provided
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## Refreshes Namespace available metrics every 1h
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[[inputs.cloudwatch.metrics]]
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names = ['Latency', 'RequestCount']
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## Dimension filters for Metric (optional)
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[[inputs.cloudwatch.metrics.dimensions]]
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name = 'LoadBalancerName'
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value = 'p-example'
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```
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#### Requirements and Terminology
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Plugin Configuration utilizes [CloudWatch concepts](http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html) and access pattern to allow monitoring of any CloudWatch Metric.
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- `region` must be a valid AWS [Region](http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#CloudWatchRegions) value
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- `period` must be a valid CloudWatch [Period](http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#CloudWatchPeriods) value
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- `namespace` must be a valid CloudWatch [Namespace](http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#Namespace) value
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- `names` must be valid CloudWatch [Metric](http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#Metric) names
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- `dimensions` must be valid CloudWatch [Dimension](http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#Dimension) name/value pairs
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#### Restrictions and Limitations
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- CloudWatch metrics are not available instantly via the CloudWatch API. You should adjust your collection `delay` to account for this lag in metrics availability based on your [monitoring subscription level](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-new.html)
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- CloudWatch API usage incurs cost - see [GetMetricStatistics Pricing](https://aws.amazon.com/cloudwatch/pricing/)
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### Measurements & Fields:
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Each CloudWatch Namespace monitored records a measurement with fields for each available Metric Statistic
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Namespace and Metrics are represented in [snake case](https://en.wikipedia.org/wiki/Snake_case)
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- cloudwatch_{namespace}
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- {metric}_sum (metric Sum value)
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- {metric}_average (metric Average value)
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- {metric}_minimum (metric Minimum value)
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- {metric}_maximum (metric Maximum value)
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- {metric}_sample_count (metric SampleCount value)
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### Tags:
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Each measurement is tagged with the following identifiers to uniquely identify the associated metric
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Tag Dimension names are represented in [snake case](https://en.wikipedia.org/wiki/Snake_case)
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- All measurements have the following tags:
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- region (CloudWatch Region)
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- unit (CloudWatch Metric Unit)
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- {dimension-name} (Cloudwatch Dimension value - one for each metric dimension)
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### Example Output:
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```
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$ ./telegraf -config telegraf.conf -input-filter cloudwatch -test
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> cloudwatch_aws_elb,load_balancer_name=p-example,region=us-east-1,unit=seconds latency_average=0.004810798017284538,latency_maximum=0.1100282669067383,latency_minimum=0.0006084442138671875,latency_sample_count=4029,latency_sum=19.382705211639404 1459542420000000000
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```
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@ -0,0 +1,305 @@
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package cloudwatch
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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/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
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"github.com/aws/aws-sdk-go/aws/ec2metadata"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/cloudwatch"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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type (
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CloudWatch struct {
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Region string `toml:"region"`
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Period internal.Duration `toml:"period"`
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Delay internal.Duration `toml:"delay"`
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Namespace string `toml:"namespace"`
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Metrics []*Metric `toml:"metrics"`
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client cloudwatchClient
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metricCache *MetricCache
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}
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Metric struct {
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MetricNames []string `toml:"names"`
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Dimensions []*Dimension `toml:"dimensions"`
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}
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Dimension struct {
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Name string `toml:"name"`
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Value string `toml:"value"`
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}
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MetricCache struct {
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TTL time.Duration
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Fetched time.Time
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Metrics []*cloudwatch.Metric
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}
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cloudwatchClient interface {
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ListMetrics(*cloudwatch.ListMetricsInput) (*cloudwatch.ListMetricsOutput, error)
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GetMetricStatistics(*cloudwatch.GetMetricStatisticsInput) (*cloudwatch.GetMetricStatisticsOutput, error)
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}
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)
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func (c *CloudWatch) SampleConfig() string {
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return `
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## Amazon Region
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region = 'us-east-1'
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## Requested CloudWatch aggregation Period (required - must be a multiple of 60s)
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period = '1m'
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## Collection Delay (required - must account for metrics availability via CloudWatch API)
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delay = '1m'
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## Recomended: use metric 'interval' that is a multiple of 'period' to avoid
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## gaps or overlap in pulled data
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interval = '1m'
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## Metric Statistic Namespace (required)
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namespace = 'AWS/ELB'
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## Metrics to Pull (optional)
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## Defaults to all Metrics in Namespace if nothing is provided
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## Refreshes Namespace available metrics every 1h
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#[[inputs.cloudwatch.metrics]]
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# names = ['Latency', 'RequestCount']
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#
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# ## Dimension filters for Metric (optional)
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# [[inputs.cloudwatch.metrics.dimensions]]
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# name = 'LoadBalancerName'
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# value = 'p-example'
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`
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}
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func (c *CloudWatch) Description() string {
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return "Pull Metric Statistics from Amazon CloudWatch"
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}
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func (c *CloudWatch) Gather(acc telegraf.Accumulator) error {
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if c.client == nil {
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c.initializeCloudWatch()
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}
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var metrics []*cloudwatch.Metric
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// check for provided metric filter
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if c.Metrics != nil {
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metrics = []*cloudwatch.Metric{}
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for _, m := range c.Metrics {
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dimensions := make([]*cloudwatch.Dimension, len(m.Dimensions))
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for k, d := range m.Dimensions {
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dimensions[k] = &cloudwatch.Dimension{
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Name: aws.String(d.Name),
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Value: aws.String(d.Value),
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}
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}
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for _, name := range m.MetricNames {
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metrics = append(metrics, &cloudwatch.Metric{
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Namespace: aws.String(c.Namespace),
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MetricName: aws.String(name),
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Dimensions: dimensions,
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})
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}
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}
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} else {
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var err error
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metrics, err = c.fetchNamespaceMetrics()
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if err != nil {
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return err
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}
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}
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metricCount := len(metrics)
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var errChan = make(chan error, metricCount)
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now := time.Now()
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// limit concurrency or we can easily exhaust user connection limit
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semaphore := make(chan byte, 64)
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for _, m := range metrics {
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semaphore <- 0x1
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go c.gatherMetric(acc, m, now, semaphore, errChan)
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}
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for i := 1; i <= metricCount; i++ {
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err := <-errChan
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if err != nil {
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return err
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}
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}
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return nil
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}
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func init() {
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inputs.Add("cloudwatch", func() telegraf.Input {
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return &CloudWatch{}
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})
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}
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/*
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* Initialize CloudWatch client
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*/
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func (c *CloudWatch) initializeCloudWatch() error {
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config := &aws.Config{
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Region: aws.String(c.Region),
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Credentials: credentials.NewChainCredentials(
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[]credentials.Provider{
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&ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(session.New())},
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&credentials.EnvProvider{},
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&credentials.SharedCredentialsProvider{},
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}),
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}
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c.client = cloudwatch.New(session.New(config))
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return nil
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}
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/*
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* Fetch available metrics for given CloudWatch Namespace
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*/
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func (c *CloudWatch) fetchNamespaceMetrics() (metrics []*cloudwatch.Metric, err error) {
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if c.metricCache != nil && c.metricCache.IsValid() {
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metrics = c.metricCache.Metrics
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return
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}
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metrics = []*cloudwatch.Metric{}
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var token *string
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for more := true; more; {
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params := &cloudwatch.ListMetricsInput{
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Namespace: aws.String(c.Namespace),
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Dimensions: []*cloudwatch.DimensionFilter{},
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NextToken: token,
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MetricName: nil,
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}
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resp, err := c.client.ListMetrics(params)
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if err != nil {
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return nil, err
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}
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metrics = append(metrics, resp.Metrics...)
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token = resp.NextToken
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more = token != nil
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}
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cacheTTL, _ := time.ParseDuration("1hr")
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c.metricCache = &MetricCache{
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Metrics: metrics,
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Fetched: time.Now(),
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TTL: cacheTTL,
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}
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return
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}
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/*
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* Gather given Metric and emit any error
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*/
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func (c *CloudWatch) gatherMetric(acc telegraf.Accumulator, metric *cloudwatch.Metric, now time.Time, semaphore chan byte, errChan chan error) {
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params := c.getStatisticsInput(metric, now)
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resp, err := c.client.GetMetricStatistics(params)
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if err != nil {
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errChan <- err
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<-semaphore
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return
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}
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for _, point := range resp.Datapoints {
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tags := map[string]string{
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"region": c.Region,
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"unit": snakeCase(*point.Unit),
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}
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for _, d := range metric.Dimensions {
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tags[snakeCase(*d.Name)] = *d.Value
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}
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// record field for each statistic
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fields := map[string]interface{}{}
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if point.Average != nil {
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fields[formatField(*metric.MetricName, cloudwatch.StatisticAverage)] = *point.Average
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}
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if point.Maximum != nil {
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fields[formatField(*metric.MetricName, cloudwatch.StatisticMaximum)] = *point.Maximum
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}
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if point.Minimum != nil {
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fields[formatField(*metric.MetricName, cloudwatch.StatisticMinimum)] = *point.Minimum
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}
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if point.SampleCount != nil {
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fields[formatField(*metric.MetricName, cloudwatch.StatisticSampleCount)] = *point.SampleCount
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}
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if point.Sum != nil {
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fields[formatField(*metric.MetricName, cloudwatch.StatisticSum)] = *point.Sum
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}
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acc.AddFields(formatMeasurement(c.Namespace), fields, tags, *point.Timestamp)
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}
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errChan <- nil
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<-semaphore
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}
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/*
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* Formatting helpers
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*/
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func formatField(metricName string, statistic string) string {
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return fmt.Sprintf("%s_%s", snakeCase(metricName), snakeCase(statistic))
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}
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func formatMeasurement(namespace string) string {
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namespace = strings.Replace(namespace, "/", "_", -1)
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namespace = snakeCase(namespace)
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return fmt.Sprintf("cloudwatch_%s", namespace)
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}
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func snakeCase(s string) string {
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s = internal.SnakeCase(s)
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s = strings.Replace(s, "__", "_", -1)
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return s
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}
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/*
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* Map Metric to *cloudwatch.GetMetricStatisticsInput for given timeframe
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*/
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func (c *CloudWatch) getStatisticsInput(metric *cloudwatch.Metric, now time.Time) *cloudwatch.GetMetricStatisticsInput {
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end := now.Add(-c.Delay.Duration)
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input := &cloudwatch.GetMetricStatisticsInput{
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StartTime: aws.Time(end.Add(-c.Period.Duration)),
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EndTime: aws.Time(end),
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MetricName: metric.MetricName,
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Namespace: metric.Namespace,
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Period: aws.Int64(int64(c.Period.Duration.Seconds())),
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Dimensions: metric.Dimensions,
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Statistics: []*string{
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aws.String(cloudwatch.StatisticAverage),
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aws.String(cloudwatch.StatisticMaximum),
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aws.String(cloudwatch.StatisticMinimum),
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aws.String(cloudwatch.StatisticSum),
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aws.String(cloudwatch.StatisticSampleCount)},
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}
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return input
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}
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/*
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* Check Metric Cache validity
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*/
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func (c *MetricCache) IsValid() bool {
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return c.Metrics != nil && time.Since(c.Fetched) < c.TTL
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}
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package cloudwatch
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import (
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"testing"
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"time"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/service/cloudwatch"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/testutil"
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"github.com/stretchr/testify/assert"
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)
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type mockCloudWatchClient struct{}
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func (m *mockCloudWatchClient) ListMetrics(params *cloudwatch.ListMetricsInput) (*cloudwatch.ListMetricsOutput, error) {
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metric := &cloudwatch.Metric{
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Namespace: params.Namespace,
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MetricName: aws.String("Latency"),
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Dimensions: []*cloudwatch.Dimension{
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&cloudwatch.Dimension{
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Name: aws.String("LoadBalancerName"),
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Value: aws.String("p-example"),
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},
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},
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}
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result := &cloudwatch.ListMetricsOutput{
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Metrics: []*cloudwatch.Metric{metric},
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}
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return result, nil
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}
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func (m *mockCloudWatchClient) GetMetricStatistics(params *cloudwatch.GetMetricStatisticsInput) (*cloudwatch.GetMetricStatisticsOutput, error) {
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dataPoint := &cloudwatch.Datapoint{
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Timestamp: params.EndTime,
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Minimum: aws.Float64(0.1),
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Maximum: aws.Float64(0.3),
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Average: aws.Float64(0.2),
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Sum: aws.Float64(123),
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SampleCount: aws.Float64(100),
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Unit: aws.String("Seconds"),
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}
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result := &cloudwatch.GetMetricStatisticsOutput{
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Label: aws.String("Latency"),
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Datapoints: []*cloudwatch.Datapoint{dataPoint},
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}
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return result, nil
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}
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func TestGather(t *testing.T) {
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duration, _ := time.ParseDuration("1m")
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internalDuration := internal.Duration{
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Duration: duration,
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}
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c := &CloudWatch{
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Region: "us-east-1",
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Namespace: "AWS/ELB",
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Delay: internalDuration,
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Period: internalDuration,
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}
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var acc testutil.Accumulator
|
||||
c.client = &mockCloudWatchClient{}
|
||||
|
||||
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)
|
||||
|
||||
}
|
||||
|
||||
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) {
|
||||
ttl, _ := time.ParseDuration("5ms")
|
||||
cache := &MetricCache{
|
||||
Metrics: []*cloudwatch.Metric{},
|
||||
Fetched: time.Now(),
|
||||
TTL: ttl,
|
||||
}
|
||||
|
||||
assert.True(t, cache.IsValid())
|
||||
time.Sleep(ttl)
|
||||
assert.False(t, cache.IsValid())
|
||||
}
|
||||
Loading…
Reference in New Issue