2016-03-01 16:12:23 +00:00
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package prometheus
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// Parser inspired from
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// https://github.com/prometheus/prom2json/blob/master/main.go
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"math"
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"mime"
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2016-07-07 10:15:47 +00:00
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"net/http"
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2016-06-13 14:21:11 +00:00
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"time"
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2016-03-01 16:12:23 +00:00
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"github.com/influxdata/telegraf"
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2016-11-22 12:51:57 +00:00
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"github.com/influxdata/telegraf/metric"
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2016-03-01 16:12:23 +00:00
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"github.com/matttproud/golang_protobuf_extensions/pbutil"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
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)
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// Parse returns a slice of Metrics from a text representation of a
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// metrics
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2016-07-07 10:15:47 +00:00
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func Parse(buf []byte, header http.Header) ([]telegraf.Metric, error) {
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2016-03-01 16:12:23 +00:00
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var metrics []telegraf.Metric
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var parser expfmt.TextParser
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// parse even if the buffer begins with a newline
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buf = bytes.TrimPrefix(buf, []byte("\n"))
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// Read raw data
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buffer := bytes.NewBuffer(buf)
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reader := bufio.NewReader(buffer)
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2016-07-07 10:15:47 +00:00
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mediatype, params, err := mime.ParseMediaType(header.Get("Content-Type"))
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2016-03-01 16:12:23 +00:00
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// Prepare output
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metricFamilies := make(map[string]*dto.MetricFamily)
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2016-07-07 10:15:47 +00:00
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2016-03-01 16:12:23 +00:00
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if err == nil && mediatype == "application/vnd.google.protobuf" &&
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params["encoding"] == "delimited" &&
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params["proto"] == "io.prometheus.client.MetricFamily" {
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for {
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mf := &dto.MetricFamily{}
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if _, ierr := pbutil.ReadDelimited(reader, mf); ierr != nil {
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if ierr == io.EOF {
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2016-03-01 16:12:23 +00:00
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break
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}
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2016-07-07 10:15:47 +00:00
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return nil, fmt.Errorf("reading metric family protocol buffer failed: %s", ierr)
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2016-03-01 16:12:23 +00:00
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}
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2016-07-07 10:15:47 +00:00
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metricFamilies[mf.GetName()] = mf
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2016-03-01 16:12:23 +00:00
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}
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} else {
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metricFamilies, err = parser.TextToMetricFamilies(reader)
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if err != nil {
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return nil, fmt.Errorf("reading text format failed: %s", err)
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}
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2016-07-07 10:15:47 +00:00
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}
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2016-03-01 16:12:23 +00:00
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2016-07-07 10:15:47 +00:00
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// read metrics
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for metricName, mf := range metricFamilies {
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for _, m := range mf.Metric {
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// reading tags
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tags := makeLabels(m)
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// reading fields
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fields := make(map[string]interface{})
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if mf.GetType() == dto.MetricType_SUMMARY {
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// summary metric
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fields = makeQuantiles(m)
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fields["count"] = float64(m.GetSummary().GetSampleCount())
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fields["sum"] = float64(m.GetSummary().GetSampleSum())
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} else if mf.GetType() == dto.MetricType_HISTOGRAM {
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// histogram metric
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fields = makeBuckets(m)
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fields["count"] = float64(m.GetHistogram().GetSampleCount())
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fields["sum"] = float64(m.GetHistogram().GetSampleSum())
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} else {
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// standard metric
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fields = getNameAndValue(m)
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}
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// converting to telegraf metric
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if len(fields) > 0 {
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var t time.Time
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if m.TimestampMs != nil && *m.TimestampMs > 0 {
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t = time.Unix(0, *m.TimestampMs*1000000)
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} else {
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t = time.Now()
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}
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2016-11-22 12:51:57 +00:00
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metric, err := metric.New(metricName, tags, fields, t)
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if err == nil {
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metrics = append(metrics, metric)
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2016-03-01 16:12:23 +00:00
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}
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}
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}
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}
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2016-07-07 10:15:47 +00:00
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return metrics, err
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2016-03-01 16:12:23 +00:00
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}
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// Get Quantiles from summary metric
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func makeQuantiles(m *dto.Metric) map[string]interface{} {
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fields := make(map[string]interface{})
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for _, q := range m.GetSummary().Quantile {
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if !math.IsNaN(q.GetValue()) {
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fields[fmt.Sprint(q.GetQuantile())] = float64(q.GetValue())
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}
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}
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return fields
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}
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// Get Buckets from histogram metric
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func makeBuckets(m *dto.Metric) map[string]interface{} {
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fields := make(map[string]interface{})
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for _, b := range m.GetHistogram().Bucket {
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fields[fmt.Sprint(b.GetUpperBound())] = float64(b.GetCumulativeCount())
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}
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return fields
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}
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// Get labels from metric
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func makeLabels(m *dto.Metric) map[string]string {
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result := map[string]string{}
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for _, lp := range m.Label {
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result[lp.GetName()] = lp.GetValue()
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}
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return result
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}
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// Get name and value from metric
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func getNameAndValue(m *dto.Metric) map[string]interface{} {
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fields := make(map[string]interface{})
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if m.Gauge != nil {
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if !math.IsNaN(m.GetGauge().GetValue()) {
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fields["gauge"] = float64(m.GetGauge().GetValue())
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}
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} else if m.Counter != nil {
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if !math.IsNaN(m.GetGauge().GetValue()) {
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fields["counter"] = float64(m.GetCounter().GetValue())
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}
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} else if m.Untyped != nil {
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if !math.IsNaN(m.GetGauge().GetValue()) {
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fields["value"] = float64(m.GetUntyped().GetValue())
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}
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}
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return fields
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}
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