package enum import ( "strconv" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/plugins/processors" ) var sampleConfig = ` [[processors.enum.fields]] ## Name of the field to map source = "name" ## Destination field to be used for the mapped value. By default the source ## field is used, overwriting the original value. # destination = "mapped" ## 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.fields.value_mappings] value1 = 1 value2 = 2 ` type EnumMapper struct { Fields []Mapping } type Mapping struct { Source string Destination string 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.Fields { if originalValue, isPresent := metric.GetField(mapping.Source); isPresent == true { 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.Destination != "" { return mapping.Destination } return mapping.Source } func writeField(metric telegraf.Metric, name string, value interface{}) { if metric.HasField(name) { metric.RemoveField(name) } metric.AddField(name, value) } func init() { processors.Add("enum", func() telegraf.Processor { return &EnumMapper{} }) }