remove snakecase dependency and utilize internal helpers

Godeps

@@ -2,7 +2,6 @@ github.com/Shopify/sarama 8aadb476e66ca998f2f6bb3c993e9a2daa3666b9
 github.com/Sirupsen/logrus 219c8cb75c258c552e999735be6df753ffc7afdc
 github.com/amir/raidman 53c1b967405155bfc8758557863bf2e14f814687
 github.com/aws/aws-sdk-go 13a12060f716145019378a10e2806c174356b857
-github.com/azer/snakecase 7a41237eda4ca971bdcbba00d459901be8221a19
 github.com/beorn7/perks 3ac7bf7a47d159a033b107610db8a1b6575507a4
 github.com/cenkalti/backoff 4dc77674aceaabba2c7e3da25d4c823edfb73f99
 github.com/couchbase/go-couchbase cb664315a324d87d19c879d9cc67fda6be8c2ac1

Godeps_windows

@@ -3,7 +3,6 @@ github.com/Sirupsen/logrus 219c8cb75c258c552e999735be6df753ffc7afdc
 github.com/StackExchange/wmi f3e2bae1e0cb5aef83e319133eabfee30013a4a5
 github.com/amir/raidman 53c1b967405155bfc8758557863bf2e14f814687
 github.com/aws/aws-sdk-go 13a12060f716145019378a10e2806c174356b857
-github.com/azer/snakecase 7a41237eda4ca971bdcbba00d459901be8221a19
 github.com/beorn7/perks 3ac7bf7a47d159a033b107610db8a1b6575507a4
 github.com/cenkalti/backoff 4dc77674aceaabba2c7e3da25d4c823edfb73f99
 github.com/couchbase/go-couchbase cb664315a324d87d19c879d9cc67fda6be8c2ac1

plugins/inputs/cloudwatch/README.md

@@ -82,5 +82,5 @@ Tag Dimension names are represented in [snake case](https://en.wikipedia.org/wik
 
 ```
 $ ./telegraf -config telegraf.conf -input-filter cloudwatch -test
-> cloudwatch_aws_elb,load_balancer_name=p-motd,region=us-east-1,unit=seconds,latency_average=0.0012776487302826093,latency_maximum=0.07484889030456543,latency_minimum=0.0006072521209716797,latency_sample_count=13493,latency_sum=17.239314317703247 1459474260000000000
+> 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
 ```

plugins/inputs/cloudwatch/cloudwatch.go

@@ -12,22 +12,20 @@ import (
 	"github.com/aws/aws-sdk-go/aws/session"
 
 	"github.com/aws/aws-sdk-go/service/cloudwatch"
-	"github.com/azer/snakecase"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
 type CloudWatch struct {
-	Region         string    `toml:"region"`
-	Period         string    `toml:"period"`
-	Delay          string    `toml:"delay"`
-	Namespace      string    `toml:"namespace"`
-	Metrics        []*Metric `toml:"metrics"`
-	client         *cloudwatch.CloudWatch
-	periodDuration time.Duration
-	delayDuration  time.Duration
-	metricCache    *MetricCache
+	Region      string            `toml:"region"`
+	Period      internal.Duration `toml:"period"`
+	Delay       internal.Duration `toml:"delay"`
+	Namespace   string            `toml:"namespace"`
+	Metrics     []*Metric         `toml:"metrics"`
+	client      *cloudwatch.CloudWatch
+	metricCache *MetricCache
 }
 
 type Metric struct {
@@ -67,13 +65,13 @@ func (c *CloudWatch) SampleConfig() string {
   ## Metrics to Pull (optional)
   ## Defaults to all Metrics in Namespace if nothing is provided
   ## Refreshes Namespace available metrics every 1h
-  [[inputs.cloudwatch.metrics]]
-    names = ['Latency', 'RequestCount']
-	
-    ## Dimension filters for Metric (optional)
-    [[inputs.cloudwatch.metrics.dimensions]]
-      name = 'LoadBalancerName'
-      value = 'p-example'
+  #[[inputs.cloudwatch.metrics]]
+  #  names = ['Latency', 'RequestCount']
+  #	
+  #  ## Dimension filters for Metric (optional)
+  #  [[inputs.cloudwatch.metrics.dimensions]]
+  #    name = 'LoadBalancerName'
+  #    value = 'p-example'
 `
 }
 
@@ -158,17 +156,6 @@ func (c *CloudWatch) initializeCloudWatch() error {
 	}
 
 	c.client = cloudwatch.New(session.New(config))
-
-	var err error
-	c.delayDuration, err = time.ParseDuration(c.Delay)
-	if err != nil {
-		return err
-	}
-	c.periodDuration, err = time.ParseDuration(c.Period)
-	if err != nil {
-		return err
-	}
-
 	return nil
 }
 
@@ -275,7 +262,7 @@ func formatMeasurement(namespace string) string {
 }
 
 func snakeCase(s string) string {
-	s = snakecase.SnakeCase(s)
+	s = internal.SnakeCase(s)
 	s = strings.Replace(s, "__", "_", -1)
 	return s
 }
@@ -284,14 +271,14 @@ func snakeCase(s string) string {
  * Map Metric to *cloudwatch.GetMetricStatisticsInput for given timeframe
  */
 func (c *CloudWatch) getStatisticsInput(metric *cloudwatch.Metric, now time.Time) *cloudwatch.GetMetricStatisticsInput {
-	end := now.Add(-c.delayDuration)
+	end := now.Add(-c.Delay.Duration)
 
 	input := &cloudwatch.GetMetricStatisticsInput{
-		StartTime:  aws.Time(end.Add(-c.periodDuration)),
+		StartTime:  aws.Time(end.Add(-c.Period.Duration)),
 		EndTime:    aws.Time(end),
 		MetricName: metric.MetricName,
 		Namespace:  metric.Namespace,
-		Period:     aws.Int64(int64(c.periodDuration.Seconds())),
+		Period:     aws.Int64(int64(c.Period.Duration.Seconds())),
 		Dimensions: metric.Dimensions,
 		Statistics: []*string{
 			aws.String(cloudwatch.StatisticAverage),