VictoriaMetrics/lib/protoparser/opentsdbhttp/streamparser.go
2020-11-13 13:23:11 +02:00

168 lines
4.4 KiB
Go

package opentsdbhttp
import (
"bufio"
"flag"
"fmt"
"io"
"net/http"
"runtime"
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
"github.com/VictoriaMetrics/metrics"
)
var (
maxInsertRequestSize = flagutil.NewBytes("opentsdbhttp.maxInsertRequestSize", 32*1024*1024, "The maximum size of OpenTSDB HTTP put request")
trimTimestamp = flag.Duration("opentsdbhttpTrimTimestamp", time.Millisecond, "Trim timestamps for OpenTSDB HTTP data to this duration. "+
"Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data")
)
// ParseStream parses OpenTSDB http lines from req and calls callback for the parsed rows.
//
// The callback can be called concurrently multiple times for streamed data from req.
//
// callback shouldn't hold rows after returning.
func ParseStream(req *http.Request, callback func(rows []Row) error) error {
readCalls.Inc()
r := req.Body
if req.Header.Get("Content-Encoding") == "gzip" {
zr, err := common.GetGzipReader(r)
if err != nil {
readErrors.Inc()
return fmt.Errorf("cannot read gzipped http protocol data: %w", err)
}
defer common.PutGzipReader(zr)
r = zr
}
ctx := getStreamContext(r)
defer putStreamContext(ctx)
// Read the request in ctx.reqBuf
lr := io.LimitReader(ctx.br, int64(maxInsertRequestSize.N)+1)
reqLen, err := ctx.reqBuf.ReadFrom(lr)
if err != nil {
readErrors.Inc()
return fmt.Errorf("cannot read HTTP OpenTSDB request: %w", err)
}
if reqLen > int64(maxInsertRequestSize.N) {
readErrors.Inc()
return fmt.Errorf("too big HTTP OpenTSDB request; mustn't exceed `-opentsdbhttp.maxInsertRequestSize=%d` bytes", maxInsertRequestSize.N)
}
// Process the request synchronously, since there is no sense in processing a single request asynchronously.
// Sync code is easier to read and understand.
p := getJSONParser()
defer putJSONParser(p)
v, err := p.ParseBytes(ctx.reqBuf.B)
if err != nil {
unmarshalErrors.Inc()
return fmt.Errorf("cannot parse HTTP OpenTSDB json: %w", err)
}
rs := getRows()
defer putRows(rs)
rs.Unmarshal(v)
rows := rs.Rows
rowsRead.Add(len(rows))
// Fill in missing timestamps
currentTimestamp := int64(fasttime.UnixTimestamp())
for i := range rows {
r := &rows[i]
if r.Timestamp == 0 {
r.Timestamp = currentTimestamp
}
}
// Convert timestamps in seconds to milliseconds if needed.
// See http://opentsdb.net/docs/javadoc/net/opentsdb/core/Const.html#SECOND_MASK
for i := range rows {
r := &rows[i]
if r.Timestamp&secondMask == 0 {
r.Timestamp *= 1e3
}
}
// Trim timestamps if required.
if tsTrim := trimTimestamp.Milliseconds(); tsTrim > 1 {
for i := range rows {
row := &rows[i]
row.Timestamp -= row.Timestamp % tsTrim
}
}
if err := callback(rows); err != nil {
return fmt.Errorf("error when processing imported data: %w", err)
}
return nil
}
const secondMask int64 = 0x7FFFFFFF00000000
type streamContext struct {
br *bufio.Reader
reqBuf bytesutil.ByteBuffer
}
func (ctx *streamContext) reset() {
ctx.br.Reset(nil)
ctx.reqBuf.Reset()
}
var (
readCalls = metrics.NewCounter(`vm_protoparser_read_calls_total{type="opentsdbhttp"}`)
readErrors = metrics.NewCounter(`vm_protoparser_read_errors_total{type="opentsdbhttp"}`)
rowsRead = metrics.NewCounter(`vm_protoparser_rows_read_total{type="opentsdbhttp"}`)
unmarshalErrors = metrics.NewCounter(`vm_protoparser_unmarshal_errors_total{type="opentsdbhttp"}`)
)
func getStreamContext(r io.Reader) *streamContext {
select {
case ctx := <-streamContextPoolCh:
ctx.br.Reset(r)
return ctx
default:
if v := streamContextPool.Get(); v != nil {
ctx := v.(*streamContext)
ctx.br.Reset(r)
return ctx
}
return &streamContext{
br: bufio.NewReaderSize(r, 64*1024),
}
}
}
func putStreamContext(ctx *streamContext) {
ctx.reset()
select {
case streamContextPoolCh <- ctx:
default:
streamContextPool.Put(ctx)
}
}
var streamContextPool sync.Pool
var streamContextPoolCh = make(chan *streamContext, runtime.GOMAXPROCS(-1))
func getRows() *Rows {
v := rowsPool.Get()
if v == nil {
return &Rows{}
}
return v.(*Rows)
}
func putRows(rs *Rows) {
rs.Reset()
rowsPool.Put(rs)
}
var rowsPool sync.Pool