Value parser, for parsing a single value into a metric

closes #849

plugins/parsers/registry.go

@@ -8,6 +8,7 @@ import (
 	"github.com/influxdata/telegraf/plugins/parsers/graphite"
 	"github.com/influxdata/telegraf/plugins/parsers/influx"
 	"github.com/influxdata/telegraf/plugins/parsers/json"
+	"github.com/influxdata/telegraf/plugins/parsers/value"
 )
 
 // ParserInput is an interface for input plugins that are able to parse
@@ -38,7 +39,7 @@ type Parser interface {
 // Config is a struct that covers the data types needed for all parser types,
 // and can be used to instantiate _any_ of the parsers.
 type Config struct {
-	// Dataformat can be one of: json, influx, graphite
+	// Dataformat can be one of: json, influx, graphite, value
 	DataFormat string
 
 	// Separator only applied to Graphite data.
@@ -48,9 +49,12 @@ type Config struct {
 
 	// TagKeys only apply to JSON data
 	TagKeys []string
-	// MetricName only applies to JSON data. This will be the name of the measurement.
+	// MetricName applies to JSON & value. This will be the name of the measurement.
 	MetricName string
 
+	// DataType only applies to value, this will be the type to parse value to
+	DataType string
+
 	// DefaultTags are the default tags that will be added to all parsed metrics.
 	DefaultTags map[string]string
 }
@@ -63,6 +67,9 @@ func NewParser(config *Config) (Parser, error) {
 	case "json":
 		parser, err = NewJSONParser(config.MetricName,
 			config.TagKeys, config.DefaultTags)
+	case "value":
+		parser, err = NewValueParser(config.MetricName,
+			config.DataType, config.DefaultTags)
 	case "influx":
 		parser, err = NewInfluxParser()
 	case "graphite":
@@ -98,3 +105,15 @@ func NewGraphiteParser(
 ) (Parser, error) {
 	return graphite.NewGraphiteParser(separator, templates, defaultTags)
 }
+
+func NewValueParser(
+	metricName string,
+	dataType string,
+	defaultTags map[string]string,
+) (Parser, error) {
+	return &value.ValueParser{
+		MetricName:  metricName,
+		DataType:    dataType,
+		DefaultTags: defaultTags,
+	}, nil
+}