package cloudwatch import ( "log" "math" "sort" "strings" "time" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/credentials" "github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds" "github.com/aws/aws-sdk-go/aws/ec2metadata" "github.com/aws/aws-sdk-go/aws/session" "github.com/aws/aws-sdk-go/service/cloudwatch" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/plugins/outputs" ) type CloudWatch struct { Region string // AWS Region Namespace string // CloudWatch Metrics Namespace svc *cloudwatch.CloudWatch } var sampleConfig = ` # Amazon REGION region = 'us-east-1' # Namespace for the CloudWatch MetricDatums namespace = 'InfluxData/Telegraf' ` func (c *CloudWatch) SampleConfig() string { return sampleConfig } func (c *CloudWatch) Description() string { return "Configuration for AWS CloudWatch output." } func (c *CloudWatch) Connect() error { Config := &aws.Config{ Region: aws.String(c.Region), Credentials: credentials.NewChainCredentials( []credentials.Provider{ &ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(session.New())}, &credentials.EnvProvider{}, &credentials.SharedCredentialsProvider{}, }), } svc := cloudwatch.New(session.New(Config)) params := &cloudwatch.ListMetricsInput{ Namespace: aws.String(c.Namespace), } _, err := svc.ListMetrics(params) // Try a read-only call to test connection. if err != nil { log.Printf("cloudwatch: Error in ListMetrics API call : %+v \n", err.Error()) } c.svc = svc return err } func (c *CloudWatch) Close() error { return nil } func (c *CloudWatch) Write(metrics []telegraf.Metric) error { for _, m := range metrics { err := c.WriteSinglePoint(m) if err != nil { return err } } return nil } // Write data for a single point. A point can have many fields and one field // is equal to one MetricDatum. There is a limit on how many MetricDatums a // request can have so we process one Point at a time. func (c *CloudWatch) WriteSinglePoint(point telegraf.Metric) error { datums := BuildMetricDatum(point) const maxDatumsPerCall = 20 // PutMetricData only supports up to 20 data metrics per call for _, partition := range PartitionDatums(maxDatumsPerCall, datums) { err := c.WriteToCloudWatch(partition) if err != nil { return err } } return nil } func (c *CloudWatch) WriteToCloudWatch(datums []*cloudwatch.MetricDatum) error { params := &cloudwatch.PutMetricDataInput{ MetricData: datums, Namespace: aws.String(c.Namespace), } _, err := c.svc.PutMetricData(params) if err != nil { log.Printf("CloudWatch: Unable to write to CloudWatch : %+v \n", err.Error()) } return err } // Partition the MetricDatums into smaller slices of a max size so that are under the limit // for the AWS API calls. func PartitionDatums(size int, datums []*cloudwatch.MetricDatum) [][]*cloudwatch.MetricDatum { numberOfPartitions := len(datums) / size if len(datums)%size != 0 { numberOfPartitions += 1 } partitions := make([][]*cloudwatch.MetricDatum, numberOfPartitions) for i := 0; i < numberOfPartitions; i++ { start := size * i end := size * (i + 1) if end > len(datums) { end = len(datums) } partitions[i] = datums[start:end] } return partitions } // Make a MetricDatum for each field in a Point. Only fields with values that can be // converted to float64 are supported. Non-supported fields are skipped. func BuildMetricDatum(point telegraf.Metric) []*cloudwatch.MetricDatum { datums := make([]*cloudwatch.MetricDatum, len(point.Fields())) i := 0 var value float64 for k, v := range point.Fields() { switch t := v.(type) { case int: value = float64(t) case int32: value = float64(t) case int64: value = float64(t) case float64: value = t case bool: if t { value = 1 } else { value = 0 } case time.Time: value = float64(t.Unix()) default: // Skip unsupported type. datums = datums[:len(datums)-1] continue } datums[i] = &cloudwatch.MetricDatum{ MetricName: aws.String(strings.Join([]string{point.Name(), k}, "_")), Value: aws.Float64(value), Dimensions: BuildDimensions(point.Tags()), Timestamp: aws.Time(point.Time()), } i += 1 } return datums } // Make a list of Dimensions by using a Point's tags. CloudWatch supports up to // 10 dimensions per metric so we only keep up to the first 10 alphabetically. // This always includes the "host" tag if it exists. func BuildDimensions(mTags map[string]string) []*cloudwatch.Dimension { const MaxDimensions = 10 dimensions := make([]*cloudwatch.Dimension, int(math.Min(float64(len(mTags)), MaxDimensions))) i := 0 // This is pretty ugly but we always want to include the "host" tag if it exists. if host, ok := mTags["host"]; ok { dimensions[i] = &cloudwatch.Dimension{ Name: aws.String("host"), Value: aws.String(host), } i += 1 } var keys []string for k := range mTags { if k != "host" { keys = append(keys, k) } } sort.Strings(keys) for _, k := range keys { if i >= MaxDimensions { break } dimensions[i] = &cloudwatch.Dimension{ Name: aws.String(k), Value: aws.String(mTags[k]), } i += 1 } return dimensions } func init() { outputs.Add("cloudwatch", func() telegraf.Output { return &CloudWatch{} }) }