VictoriaMetrics/app/vmagent/opentsdbhttp/request_handler.go

package opentsdbhttp

import (
	"errors"
	"fmt"
	"net/http"
	"strings"

	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmagent/common"
	"github.com/VictoriaMetrics/VictoriaMetrics/app/vmagent/remotewrite"
	"github.com/VictoriaMetrics/VictoriaMetrics/lib/auth"
	"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
	parserCommon "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
	parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/opentsdbhttp"
	"github.com/VictoriaMetrics/VictoriaMetrics/lib/writeconcurrencylimiter"
	"github.com/VictoriaMetrics/metrics"
)

var (
	rowsInserted  = metrics.NewCounter(`vmagent_rows_inserted_total{type="opentsdbhttp"}`)
	rowsPerInsert = metrics.NewHistogram(`vmagent_rows_per_insert{type="opentsdbhttp"}`)
)

// InsertHandler processes HTTP OpenTSDB put requests.
// See http://opentsdb.net/docs/build/html/api_http/put.html
func InsertHandler(req *http.Request) error {
	path := strings.Replace(req.URL.Path, "//", "/", -1)
	p, err := httpserver.ParsePath(path)
	if err != nil {
		// Cannot parse multitenant path. Skip it - probably it will be parsed later.
		return err
	}
	if p.Prefix != "insert" {
		return errors.New(fmt.Sprintf(`unsupported multitenant prefix: %q; expected "insert"`, p.Prefix))
	}
	at, err := auth.NewToken(p.AuthToken)
	extraLabels, err := parserCommon.GetExtraLabels(req)
	if err != nil {
		return err
	}
	return writeconcurrencylimiter.Do(func() error {
		return parser.ParseStream(req, func(rows []parser.Row) error {
			return insertRows(at, rows, extraLabels)
		})
	})
}

func insertRows(at *auth.Token, rows []parser.Row, extraLabels []prompbmarshal.Label) error {
	ctx := common.GetPushCtx()
	defer common.PutPushCtx(ctx)

	tssDst := ctx.WriteRequest.Timeseries[:0]
	labels := ctx.Labels[:0]
	samples := ctx.Samples[:0]
	for i := range rows {
		r := &rows[i]
		labelsLen := len(labels)
		labels = append(labels, prompbmarshal.Label{
			Name:  "__name__",
			Value: r.Metric,
		})
		for j := range r.Tags {
			tag := &r.Tags[j]
			labels = append(labels, prompbmarshal.Label{
				Name:  tag.Key,
				Value: tag.Value,
			})
		}
		labels = append(labels, extraLabels...)
		samples = append(samples, prompbmarshal.Sample{
			Value:     r.Value,
			Timestamp: r.Timestamp,
		})
		tssDst = append(tssDst, prompbmarshal.TimeSeries{
			Labels:  labels[labelsLen:],
			Samples: samples[len(samples)-1:],
		})
	}
	ctx.WriteRequest.Timeseries = tssDst
	ctx.Labels = labels
	ctx.Samples = samples
	remotewrite.Push(at, &ctx.WriteRequest)
	rowsInserted.Add(len(rows))
	rowsPerInsert.Update(float64(len(rows)))
	return nil
}