package valuecounter import ( "fmt" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/plugins/aggregators" ) type aggregate struct { name string tags map[string]string fieldCount map[string]int } // ValueCounter an aggregation plugin type ValueCounter struct { cache map[uint64]aggregate Fields []string } // NewValueCounter create a new aggregation plugin which counts the occurrences // of fields and emits the count. func NewValueCounter() telegraf.Aggregator { vc := &ValueCounter{} vc.Reset() return vc } var sampleConfig = ` ## General Aggregator Arguments: ## The period on which to flush & clear the aggregator. period = "30s" ## If true, the original metric will be dropped by the ## aggregator and will not get sent to the output plugins. drop_original = false ## The fields for which the values will be counted fields = [] ` // SampleConfig generates a sample config for the ValueCounter plugin func (vc *ValueCounter) SampleConfig() string { return sampleConfig } // Description returns the description of the ValueCounter plugin func (vc *ValueCounter) Description() string { return "Count the occurrence of values in fields." } // Add is run on every metric which passes the plugin func (vc *ValueCounter) Add(in telegraf.Metric) { id := in.HashID() // Check if the cache already has an entry for this metric, if not create it if _, ok := vc.cache[id]; !ok { a := aggregate{ name: in.Name(), tags: in.Tags(), fieldCount: make(map[string]int), } vc.cache[id] = a } // Check if this metric has fields which we need to count, if so increment // the count. for fk, fv := range in.Fields() { for _, cf := range vc.Fields { if fk == cf { fn := fmt.Sprintf("%v_%v", fk, fv) vc.cache[id].fieldCount[fn]++ } } } } // Push emits the counters func (vc *ValueCounter) Push(acc telegraf.Accumulator) { for _, agg := range vc.cache { fields := map[string]interface{}{} for field, count := range agg.fieldCount { fields[field] = count } acc.AddFields(agg.name, fields, agg.tags) } } // Reset the cache, executed after each push func (vc *ValueCounter) Reset() { vc.cache = make(map[uint64]aggregate) } func init() { aggregators.Add("valuecounter", func() telegraf.Aggregator { return NewValueCounter() }) }