mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-21 16:06:31 +01:00
126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package promremotewrite
|
|
|
|
import (
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"runtime"
|
|
"sync"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompb"
|
|
"github.com/VictoriaMetrics/metrics"
|
|
"github.com/golang/snappy"
|
|
)
|
|
|
|
var maxInsertRequestSize = flag.Int("maxInsertRequestSize", 32*1024*1024, "The maximum size in bytes of a single Prometheus remote_write API request")
|
|
|
|
// ParseStream parses Prometheus remote_write message req and calls callback for the parsed timeseries.
|
|
//
|
|
// callback shouldn't hold timeseries after returning.
|
|
func ParseStream(req *http.Request, callback func(timeseries []prompb.TimeSeries) error) error {
|
|
ctx := getPushCtx()
|
|
defer putPushCtx(ctx)
|
|
if err := ctx.Read(req); err != nil {
|
|
return err
|
|
}
|
|
return callback(ctx.wr.Timeseries)
|
|
}
|
|
|
|
type pushCtx struct {
|
|
wr prompb.WriteRequest
|
|
reqBuf []byte
|
|
}
|
|
|
|
func (ctx *pushCtx) reset() {
|
|
ctx.wr.Reset()
|
|
ctx.reqBuf = ctx.reqBuf[:0]
|
|
}
|
|
|
|
func (ctx *pushCtx) Read(r *http.Request) error {
|
|
readCalls.Inc()
|
|
var err error
|
|
ctx.reqBuf, err = readSnappy(ctx.reqBuf[:0], r.Body)
|
|
if err != nil {
|
|
readErrors.Inc()
|
|
return fmt.Errorf("cannot read prompb.WriteRequest: %s", err)
|
|
}
|
|
if err = ctx.wr.Unmarshal(ctx.reqBuf); err != nil {
|
|
unmarshalErrors.Inc()
|
|
return fmt.Errorf("cannot unmarshal prompb.WriteRequest with size %d bytes: %s", len(ctx.reqBuf), err)
|
|
}
|
|
|
|
rows := 0
|
|
tss := ctx.wr.Timeseries
|
|
for i := range tss {
|
|
rows += len(tss[i].Samples)
|
|
}
|
|
rowsRead.Add(rows)
|
|
|
|
return nil
|
|
}
|
|
|
|
var (
|
|
readCalls = metrics.NewCounter(`vm_protoparser_read_calls_total{type="promremotewrite"}`)
|
|
readErrors = metrics.NewCounter(`vm_protoparser_read_errors_total{type="promremotewrite"}`)
|
|
rowsRead = metrics.NewCounter(`vm_protoparser_rows_read_total{type="promremotewrite"}`)
|
|
unmarshalErrors = metrics.NewCounter(`vm_protoparser_unmarshal_errors{type="promremotewrite"}`)
|
|
)
|
|
|
|
func getPushCtx() *pushCtx {
|
|
select {
|
|
case ctx := <-pushCtxPoolCh:
|
|
return ctx
|
|
default:
|
|
if v := pushCtxPool.Get(); v != nil {
|
|
return v.(*pushCtx)
|
|
}
|
|
return &pushCtx{}
|
|
}
|
|
}
|
|
|
|
func putPushCtx(ctx *pushCtx) {
|
|
ctx.reset()
|
|
select {
|
|
case pushCtxPoolCh <- ctx:
|
|
default:
|
|
pushCtxPool.Put(ctx)
|
|
}
|
|
}
|
|
|
|
var pushCtxPool sync.Pool
|
|
var pushCtxPoolCh = make(chan *pushCtx, runtime.GOMAXPROCS(-1))
|
|
|
|
func readSnappy(dst []byte, r io.Reader) ([]byte, error) {
|
|
lr := io.LimitReader(r, int64(*maxInsertRequestSize)+1)
|
|
bb := bodyBufferPool.Get()
|
|
reqLen, err := bb.ReadFrom(lr)
|
|
if err != nil {
|
|
bodyBufferPool.Put(bb)
|
|
return dst, fmt.Errorf("cannot read compressed request: %s", err)
|
|
}
|
|
if reqLen > int64(*maxInsertRequestSize) {
|
|
return dst, fmt.Errorf("too big packed request; mustn't exceed `-maxInsertRequestSize=%d` bytes", *maxInsertRequestSize)
|
|
}
|
|
|
|
buf := dst[len(dst):cap(dst)]
|
|
buf, err = snappy.Decode(buf, bb.B)
|
|
bodyBufferPool.Put(bb)
|
|
if err != nil {
|
|
err = fmt.Errorf("cannot decompress request with length %d: %s", reqLen, err)
|
|
return dst, err
|
|
}
|
|
if len(buf) > *maxInsertRequestSize {
|
|
return dst, fmt.Errorf("too big unpacked request; mustn't exceed `-maxInsertRequestSize=%d` bytes; got %d bytes", *maxInsertRequestSize, len(buf))
|
|
}
|
|
if len(buf) > 0 && len(dst) < cap(dst) && &buf[0] == &dst[len(dst):cap(dst)][0] {
|
|
dst = dst[:len(dst)+len(buf)]
|
|
} else {
|
|
dst = append(dst, buf...)
|
|
}
|
|
return dst, nil
|
|
}
|
|
|
|
var bodyBufferPool bytesutil.ByteBufferPool
|