VictoriaMetrics/app/vminsert/prometheusimport/request_handler.go

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package prometheusimport
import (
"net/http"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/common"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/relabel"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
parserCommon "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/prometheus"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/writeconcurrencylimiter"
"github.com/VictoriaMetrics/metrics"
)
var (
rowsInserted = metrics.NewCounter(`vm_rows_inserted_total{type="prometheus"}`)
rowsPerInsert = metrics.NewHistogram(`vm_rows_per_insert{type="prometheus"}`)
)
// InsertHandler processes `/api/v1/import/prometheus` request.
func InsertHandler(req *http.Request) error {
extraLabels, err := parserCommon.GetExtraLabels(req)
if err != nil {
return err
}
defaultTimestamp, err := parserCommon.GetTimestamp(req)
if err != nil {
return err
}
return writeconcurrencylimiter.Do(func() error {
isGzipped := req.Header.Get("Content-Encoding") == "gzip"
return parser.ParseStream(req.Body, defaultTimestamp, isGzipped, func(rows []parser.Row) error {
return insertRows(rows, extraLabels)
})
})
}
func insertRows(rows []parser.Row, extraLabels []prompbmarshal.Label) error {
ctx := common.GetInsertCtx()
defer common.PutInsertCtx(ctx)
ctx.Reset(len(rows))
hasRelabeling := relabel.HasRelabeling()
for i := range rows {
r := &rows[i]
ctx.Labels = ctx.Labels[:0]
ctx.AddLabel("", r.Metric)
for j := range r.Tags {
tag := &r.Tags[j]
ctx.AddLabel(tag.Key, tag.Value)
}
for j := range extraLabels {
label := &extraLabels[j]
ctx.AddLabel(label.Name, label.Value)
}
if hasRelabeling {
ctx.ApplyRelabeling()
}
if len(ctx.Labels) == 0 {
// Skip metric without labels.
continue
}
if err := ctx.WriteDataPoint(nil, ctx.Labels, r.Timestamp, r.Value); err != nil {
return err
}
}
rowsInserted.Add(len(rows))
rowsPerInsert.Update(float64(len(rows)))
return ctx.FlushBufs()
}