mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-12 12:46:23 +01:00
135 lines
4.1 KiB
Go
135 lines
4.1 KiB
Go
package netstorage
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import (
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"fmt"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/auth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/consts"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompb"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
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xxhash "github.com/cespare/xxhash/v2"
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jump "github.com/lithammer/go-jump-consistent-hash"
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)
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// InsertCtx is a generic context for inserting data
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type InsertCtx struct {
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Labels []prompb.Label
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MetricNameBuf []byte
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bufs [][]byte
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labelsBuf []byte
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sizeBuf [8]byte
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}
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// Reset resets ctx.
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func (ctx *InsertCtx) Reset() {
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for _, label := range ctx.Labels {
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label.Name = nil
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label.Value = nil
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}
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ctx.Labels = ctx.Labels[:0]
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ctx.MetricNameBuf = ctx.MetricNameBuf[:0]
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if ctx.bufs == nil {
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ctx.bufs = make([][]byte, len(storageNodes))
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}
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for i := range ctx.bufs {
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ctx.bufs[i] = ctx.bufs[i][:0]
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}
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ctx.labelsBuf = ctx.labelsBuf[:0]
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}
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// AddLabel adds (name, value) label to ctx.Labels.
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//
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// name and value must exist until ctx.Labels is used.
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func (ctx *InsertCtx) AddLabel(name, value string) {
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labels := ctx.Labels
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if cap(labels) > len(labels) {
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labels = labels[:len(labels)+1]
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} else {
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labels = append(labels, prompb.Label{})
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}
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label := &labels[len(labels)-1]
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// Do not copy name and value contents for performance reasons.
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// This reduces GC overhead on the number of objects and allocations.
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label.Name = bytesutil.ToUnsafeBytes(name)
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label.Value = bytesutil.ToUnsafeBytes(value)
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ctx.Labels = labels
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}
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// WriteDataPoint writes (timestamp, value) data point with the given at and labels to ctx buffer.
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func (ctx *InsertCtx) WriteDataPoint(at *auth.Token, labels []prompb.Label, timestamp int64, value float64) error {
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ctx.MetricNameBuf = storage.MarshalMetricNameRaw(ctx.MetricNameBuf[:0], at.AccountID, at.ProjectID, labels)
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storageNodeIdx := ctx.GetStorageNodeIdx(at, labels)
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return ctx.WriteDataPointExt(at, storageNodeIdx, ctx.MetricNameBuf, timestamp, value)
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}
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// WriteDataPointExt writes the given metricNameRaw with (timestmap, value) to ctx buffer with the given storageNodeIdx.
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func (ctx *InsertCtx) WriteDataPointExt(at *auth.Token, storageNodeIdx int, metricNameRaw []byte, timestamp int64, value float64) error {
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buf := ctx.bufs[storageNodeIdx]
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sn := storageNodes[storageNodeIdx]
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bufNew := storage.MarshalMetricRow(buf, metricNameRaw, timestamp, value)
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if len(bufNew) >= consts.MaxInsertPacketSize {
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// Send buf to storageNode, since it is too big.
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if err := sn.sendWithFallback(buf, ctx.sizeBuf[:]); err != nil {
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return fmt.Errorf("cannot send %d bytes to storageNodes: %s", len(buf), err)
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}
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buf = storage.MarshalMetricRow(bufNew[:0], metricNameRaw, timestamp, value)
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} else {
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buf = bufNew
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}
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ctx.bufs[storageNodeIdx] = buf
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sn.RowsPushed.Inc()
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return nil
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}
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// FlushBufs flushes ctx bufs to remote storage nodes.
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func (ctx *InsertCtx) FlushBufs() error {
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// Send per-storageNode bufs.
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sizeBuf := ctx.sizeBuf[:]
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for i, buf := range ctx.bufs {
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if len(buf) == 0 {
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continue
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}
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sn := storageNodes[i]
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if err := sn.sendWithFallback(buf, sizeBuf); err != nil {
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return fmt.Errorf("cannot send data to storageNodes: %s", err)
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}
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}
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return nil
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}
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// GetStorageNodeIdx returns storage node index for the given at and labels.
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//
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// The returned index must be passed to WriteDataPoint.
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func (ctx *InsertCtx) GetStorageNodeIdx(at *auth.Token, labels []prompb.Label) int {
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if len(storageNodes) == 1 {
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// Fast path - only a single storage node.
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return 0
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}
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buf := ctx.labelsBuf[:0]
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buf = encoding.MarshalUint32(buf, at.AccountID)
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buf = encoding.MarshalUint32(buf, at.ProjectID)
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for i := range labels {
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label := &labels[i]
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buf = marshalBytesFast(buf, label.Name)
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buf = marshalBytesFast(buf, label.Value)
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}
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h := xxhash.Sum64(buf)
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ctx.labelsBuf = buf
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idx := int(jump.Hash(h, int32(len(storageNodes))))
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return idx
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}
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func marshalBytesFast(dst []byte, s []byte) []byte {
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dst = encoding.MarshalUint16(dst, uint16(len(s)))
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dst = append(dst, s...)
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return dst
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}
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