telegraf/plugins/processors/enum/enum.go

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package enum
import (
"strconv"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/processors"
)
var sampleConfig = `
[[processors.enum.mapping]]
## Name of the field to map
field = "status"
## Destination field to be used for the mapped value. By default the source
## field is used, overwriting the original value.
# dest = "status_code"
## Default value to be used for all values not contained in the mapping
## table. When unset, the unmodified value for the field will be used if no
## match is found.
# default = 0
## Table of mappings
[processors.enum.mapping.value_mappings]
green = 1
yellow = 2
red = 3
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`
type EnumMapper struct {
Mappings []Mapping `toml:"mapping"`
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}
type Mapping struct {
Field string
Dest string
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Default interface{}
ValueMappings map[string]interface{}
}
func (mapper *EnumMapper) SampleConfig() string {
return sampleConfig
}
func (mapper *EnumMapper) Description() string {
return "Map enum values according to given table."
}
func (mapper *EnumMapper) Apply(in ...telegraf.Metric) []telegraf.Metric {
for i := 0; i < len(in); i++ {
in[i] = mapper.applyMappings(in[i])
}
return in
}
func (mapper *EnumMapper) applyMappings(metric telegraf.Metric) telegraf.Metric {
for _, mapping := range mapper.Mappings {
if originalValue, isPresent := metric.GetField(mapping.Field); isPresent == true {
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if adjustedValue, isString := adjustBoolValue(originalValue).(string); isString == true {
if mappedValue, isMappedValuePresent := mapping.mapValue(adjustedValue); isMappedValuePresent == true {
writeField(metric, mapping.getDestination(), mappedValue)
}
}
}
}
return metric
}
func adjustBoolValue(in interface{}) interface{} {
if mappedBool, isBool := in.(bool); isBool == true {
return strconv.FormatBool(mappedBool)
}
return in
}
func (mapping *Mapping) mapValue(original string) (interface{}, bool) {
if mapped, found := mapping.ValueMappings[original]; found == true {
return mapped, true
}
if mapping.Default != nil {
return mapping.Default, true
}
return original, false
}
func (mapping *Mapping) getDestination() string {
if mapping.Dest != "" {
return mapping.Dest
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}
return mapping.Field
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}
func writeField(metric telegraf.Metric, name string, value interface{}) {
metric.RemoveField(name)
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metric.AddField(name, value)
}
func init() {
processors.Add("enum", func() telegraf.Processor {
return &EnumMapper{}
})
}