99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
package prometheus
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"net/http"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
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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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return expfmt.ResponseFormat(header).FormatType() != expfmt.TypeUnknown
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}
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type Parser struct {
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IgnoreTimestamp bool `toml:"prometheus_ignore_timestamp"`
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MetricVersion int `toml:"prometheus_metric_version"`
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Header http.Header `toml:"-"` // set by the prometheus input
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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 and
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// create a matching decoder.
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format := expfmt.NewFormat(expfmt.TypeProtoCompact)
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if len(p.Header) > 0 {
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format = expfmt.ResponseFormat(p.Header)
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switch format.FormatType() {
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case expfmt.TypeProtoText:
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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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case expfmt.TypeUnknown:
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p.Log.Debugf("Unknown format %q... Trying to continue...", p.Header.Get("Content-Type"))
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}
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}
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buf := bytes.NewBuffer(data)
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decoder := expfmt.NewDecoder(buf, format)
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// Decode the input data into prometheus metrics
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var metrics []telegraf.Metric
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for {
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var mf dto.MetricFamily
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if err := decoder.Decode(&mf); err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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return nil, fmt.Errorf("decoding response failed: %w", err)
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}
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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 prometheus 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 init() {
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parsers.Add("prometheus",
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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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