143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
package openmetrics
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import (
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"bytes"
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"errors"
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"fmt"
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"mime"
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"net/http"
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"github.com/prometheus/common/expfmt"
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"google.golang.org/protobuf/proto"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/parsers"
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)
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func AcceptsContent(header http.Header) bool {
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contentType := header.Get("Content-Type")
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if contentType == "" {
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return false
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}
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mediaType, params, err := mime.ParseMediaType(contentType)
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if err != nil {
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return false
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}
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switch mediaType {
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case expfmt.OpenMetricsType:
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return true
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case "application/openmetrics-protobuf":
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return params["version"] == "1.0.0"
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}
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return false
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}
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type Parser struct {
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IgnoreTimestamp bool `toml:"openmetrics_ignore_timestamp"`
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MetricVersion int `toml:"openmetrics_metric_version"`
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Header http.Header `toml:"-"` // set by the input plugin
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DefaultTags map[string]string `toml:"-"`
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Log telegraf.Logger `toml:"-"`
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}
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func (p *Parser) SetDefaultTags(tags map[string]string) {
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p.DefaultTags = tags
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}
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func (p *Parser) Parse(data []byte) ([]telegraf.Metric, error) {
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// Determine the metric transport-type derived from the response header
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contentType := p.Header.Get("Content-Type")
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var mediaType string
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var params map[string]string
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if contentType == "" {
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// Fallback to text type if no content-type is given
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mediaType = expfmt.OpenMetricsType
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} else {
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var err error
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mediaType, params, err = mime.ParseMediaType(contentType)
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if err != nil {
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return nil, fmt.Errorf("unknown media-type in %q", contentType)
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}
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}
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// Parse the raw data into OpenMetrics metrics
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var metricFamilies []*MetricFamily
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switch mediaType {
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case expfmt.OpenMetricsType:
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// Make sure we have a finishing newline but no trailing one
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data = bytes.TrimPrefix(data, []byte("\n"))
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if !bytes.HasSuffix(data, []byte("\n")) {
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data = append(data, []byte("\n")...)
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}
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var err error
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metricFamilies, err = TextToMetricFamilies(data)
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if err != nil {
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return nil, fmt.Errorf("parsing text format failed: %w", err)
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}
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case "application/openmetrics-protobuf":
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if version := params["version"]; version != "1.0.0" {
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return nil, fmt.Errorf("unsupported binary version %q", version)
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}
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var metricSet MetricSet
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if err := proto.Unmarshal(data, &metricSet); err != nil {
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return nil, fmt.Errorf("parsing binary format failed: %w", err)
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}
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metricFamilies = metricSet.GetMetricFamilies()
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}
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// Convert the OpenMetrics metrics into Telegraf metrics
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var metrics []telegraf.Metric
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for _, mf := range metricFamilies {
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switch p.MetricVersion {
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case 0, 2:
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metrics = append(metrics, p.extractMetricsV2(mf)...)
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case 1:
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metrics = append(metrics, p.extractMetricsV1(mf)...)
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default:
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return nil, fmt.Errorf("unknown metric version %d", p.MetricVersion)
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}
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}
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return metrics, nil
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}
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func (p *Parser) ParseLine(line string) (telegraf.Metric, error) {
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metrics, err := p.Parse([]byte(line))
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if err != nil {
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return nil, err
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}
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if len(metrics) < 1 {
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return nil, errors.New("no metrics in line")
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}
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if len(metrics) > 1 {
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return nil, errors.New("more than one metric in line")
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}
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return metrics[0], nil
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}
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func getTagsFromLabels(m *Metric, defaultTags map[string]string) map[string]string {
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result := make(map[string]string, len(defaultTags)+len(m.Labels))
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for key, value := range defaultTags {
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result[key] = value
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}
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for _, label := range m.Labels {
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if v := label.GetValue(); v != "" {
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result[label.Name] = v
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}
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}
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return result
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}
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func init() {
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parsers.Add("openmetrics",
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func(string) telegraf.Parser {
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return &Parser{}
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},
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)
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}
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