mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package promremotewrite
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import (
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"flag"
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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/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 = flag.Int("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 timeseries after returning.
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func ParseStream(req *http.Request, callback func(timeseries []prompb.TimeSeries) error) error {
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ctx := getPushCtx()
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defer putPushCtx(ctx)
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if err := ctx.Read(req); err != nil {
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return err
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}
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return callback(ctx.wr.Timeseries)
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}
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type pushCtx struct {
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wr prompb.WriteRequest
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reqBuf []byte
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}
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func (ctx *pushCtx) reset() {
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ctx.wr.Reset()
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ctx.reqBuf = ctx.reqBuf[:0]
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}
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func (ctx *pushCtx) Read(r *http.Request) error {
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readCalls.Inc()
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var err error
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ctx.reqBuf, err = readSnappy(ctx.reqBuf[:0], r.Body)
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if err != nil {
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readErrors.Inc()
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return fmt.Errorf("cannot read prompb.WriteRequest: %s", err)
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}
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if err = ctx.wr.Unmarshal(ctx.reqBuf); err != nil {
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unmarshalErrors.Inc()
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return fmt.Errorf("cannot unmarshal prompb.WriteRequest with size %d bytes: %s", len(ctx.reqBuf), err)
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}
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rows := 0
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tss := ctx.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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return nil
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}
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var (
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readCalls = metrics.NewCounter(`vm_protoparser_promremotewrite_read_calls_total`)
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readErrors = metrics.NewCounter(`vm_protoparser_promremotewrite_read_errors_total`)
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rowsRead = metrics.NewCounter(`vm_protoparser_promremotewrite_rows_read_total`)
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unmarshalErrors = metrics.NewCounter(`vm_protoparser_promremotewrite_unmarshal_errors`)
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)
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func getPushCtx() *pushCtx {
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select {
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case ctx := <-pushCtxPoolCh:
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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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return v.(*pushCtx)
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}
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return &pushCtx{}
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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 readSnappy(dst []byte, r io.Reader) ([]byte, error) {
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lr := io.LimitReader(r, int64(*maxInsertRequestSize)+1)
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bb := bodyBufferPool.Get()
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reqLen, err := bb.ReadFrom(lr)
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if err != nil {
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bodyBufferPool.Put(bb)
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return dst, fmt.Errorf("cannot read compressed request: %s", err)
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}
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if reqLen > int64(*maxInsertRequestSize) {
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return dst, fmt.Errorf("too big packed request; mustn't exceed `-maxInsertRequestSize=%d` bytes", *maxInsertRequestSize)
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}
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buf := dst[len(dst):cap(dst)]
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buf, err = snappy.Decode(buf, bb.B)
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bodyBufferPool.Put(bb)
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if err != nil {
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err = fmt.Errorf("cannot decompress request with length %d: %s", reqLen, err)
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return dst, err
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}
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if len(buf) > *maxInsertRequestSize {
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return dst, fmt.Errorf("too big unpacked request; mustn't exceed `-maxInsertRequestSize=%d` bytes; got %d bytes", *maxInsertRequestSize, len(buf))
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}
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if len(buf) > 0 && len(dst) < cap(dst) && &buf[0] == &dst[len(dst):cap(dst)][0] {
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dst = dst[:len(dst)+len(buf)]
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} else {
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dst = append(dst, buf...)
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}
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return dst, nil
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}
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var bodyBufferPool bytesutil.ByteBufferPool
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