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9dfe00c962
There is no reason in processing these requests asynchronously in the face of https://github.com/VictoriaMetrics/VictoriaMetrics/issues/896 Synchronous processing code is easier to read and understand than the previous async code
140 lines
3.7 KiB
Go
140 lines
3.7 KiB
Go
package promremotewrite
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import (
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"bufio"
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"fmt"
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"io"
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"net/http"
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"runtime"
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"sync"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompb"
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"github.com/VictoriaMetrics/metrics"
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"github.com/golang/snappy"
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)
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var maxInsertRequestSize = flagutil.NewBytes("maxInsertRequestSize", 32*1024*1024, "The maximum size in bytes of a single Prometheus remote_write API request")
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// ParseStream parses Prometheus remote_write message req and calls callback for the parsed timeseries.
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//
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// callback shouldn't hold tss after returning.
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func ParseStream(req *http.Request, callback func(tss []prompb.TimeSeries) error) error {
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ctx := getPushCtx(req.Body)
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defer putPushCtx(ctx)
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if err := ctx.Read(); err != nil {
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return err
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}
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// Synchronously process the request in order to properly return errors to ParseStream caller,
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// so it could properly return HTTP 503 status code in response.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/896
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bb := bodyBufferPool.Get()
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defer bodyBufferPool.Put(bb)
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var err error
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bb.B, err = snappy.Decode(bb.B[:cap(bb.B)], ctx.reqBuf.B)
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if err != nil {
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return fmt.Errorf("cannot decompress request with length %d: %w", len(ctx.reqBuf.B), err)
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}
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if len(bb.B) > maxInsertRequestSize.N {
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return fmt.Errorf("too big unpacked request; mustn't exceed `-maxInsertRequestSize=%d` bytes; got %d bytes", maxInsertRequestSize.N, len(bb.B))
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}
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wr := getWriteRequest()
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defer putWriteRequest(wr)
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if err := wr.Unmarshal(bb.B); err != nil {
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unmarshalErrors.Inc()
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return fmt.Errorf("cannot unmarshal prompb.WriteRequest with size %d bytes: %w", len(bb.B), err)
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}
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rows := 0
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tss := wr.Timeseries
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for i := range tss {
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rows += len(tss[i].Samples)
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}
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rowsRead.Add(rows)
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if err := callback(tss); err != nil {
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return fmt.Errorf("error when processing imported data: %w", err)
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}
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return nil
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}
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var bodyBufferPool bytesutil.ByteBufferPool
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type pushCtx struct {
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br *bufio.Reader
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reqBuf bytesutil.ByteBuffer
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}
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func (ctx *pushCtx) reset() {
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ctx.br.Reset(nil)
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ctx.reqBuf.Reset()
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}
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func (ctx *pushCtx) Read() error {
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readCalls.Inc()
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lr := io.LimitReader(ctx.br, int64(maxInsertRequestSize.N)+1)
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reqLen, err := ctx.reqBuf.ReadFrom(lr)
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if err != nil {
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readErrors.Inc()
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return fmt.Errorf("cannot read compressed request: %w", err)
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}
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if reqLen > int64(maxInsertRequestSize.N) {
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readErrors.Inc()
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return fmt.Errorf("too big packed request; mustn't exceed `-maxInsertRequestSize=%d` bytes", maxInsertRequestSize.N)
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}
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return nil
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}
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var (
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readCalls = metrics.NewCounter(`vm_protoparser_read_calls_total{type="promremotewrite"}`)
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readErrors = metrics.NewCounter(`vm_protoparser_read_errors_total{type="promremotewrite"}`)
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rowsRead = metrics.NewCounter(`vm_protoparser_rows_read_total{type="promremotewrite"}`)
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unmarshalErrors = metrics.NewCounter(`vm_protoparser_unmarshal_errors_total{type="promremotewrite"}`)
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)
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func getPushCtx(r io.Reader) *pushCtx {
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select {
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case ctx := <-pushCtxPoolCh:
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ctx.br.Reset(r)
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return ctx
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default:
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if v := pushCtxPool.Get(); v != nil {
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ctx := v.(*pushCtx)
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ctx.br.Reset(r)
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return ctx
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}
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return &pushCtx{
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br: bufio.NewReaderSize(r, 64*1024),
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}
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}
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}
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func putPushCtx(ctx *pushCtx) {
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ctx.reset()
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select {
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case pushCtxPoolCh <- ctx:
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default:
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pushCtxPool.Put(ctx)
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}
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}
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var pushCtxPool sync.Pool
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var pushCtxPoolCh = make(chan *pushCtx, runtime.GOMAXPROCS(-1))
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func getWriteRequest() *prompb.WriteRequest {
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v := writeRequestPool.Get()
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if v == nil {
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return &prompb.WriteRequest{}
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}
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return v.(*prompb.WriteRequest)
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}
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func putWriteRequest(wr *prompb.WriteRequest) {
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wr.Reset()
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writeRequestPool.Put(wr)
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}
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var writeRequestPool sync.Pool
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