lib/protoparser/vmimport: extract stream parsing code into a separate stream package

This is a follow-up for 057698f7fb

app/vmagent/vmimport/request_handler.go

@@ -11,6 +11,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
 	parserCommon "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
 	parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/vmimport"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/vmimport/stream"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/tenantmetrics"
 	"github.com/VictoriaMetrics/metrics"
 )
@@ -30,7 +31,7 @@ func InsertHandler(at *auth.Token, req *http.Request) error {
 		return err
 	}
 	isGzipped := req.Header.Get("Content-Encoding") == "gzip"
-	return parser.ParseStream(req.Body, isGzipped, func(rows []parser.Row) error {
+	return stream.Parse(req.Body, isGzipped, func(rows []parser.Row) error {
 		return insertRows(at, rows, extraLabels)
 	})
 }

app/vminsert/vmimport/request_handler.go

@@ -10,6 +10,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
 	parserCommon "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
 	parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/vmimport"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/vmimport/stream"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/tenantmetrics"
 	"github.com/VictoriaMetrics/metrics"
@@ -30,7 +31,7 @@ func InsertHandler(at *auth.Token, req *http.Request) error {
 		return err
 	}
 	isGzipped := req.Header.Get("Content-Encoding") == "gzip"
-	return parser.ParseStream(req.Body, isGzipped, func(rows []parser.Row) error {
+	return stream.Parse(req.Body, isGzipped, func(rows []parser.Row) error {
 		return insertRows(at, rows, extraLabels)
 	})
 }

lib/protoparser/vmimport/stream/streamparser.go

@@ -1,4 +1,4 @@
-package vmimport
+package stream
 
 import (
 	"bufio"
@@ -10,6 +10,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/vmimport"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/writeconcurrencylimiter"
 	"github.com/VictoriaMetrics/metrics"
 )
@@ -17,12 +18,12 @@ import (
 var maxLineLen = flagutil.NewBytes("import.maxLineLen", 100*1024*1024, "The maximum length in bytes of a single line accepted by /api/v1/import; "+
 	"the line length can be limited with 'max_rows_per_line' query arg passed to /api/v1/export")
 
-// ParseStream parses /api/v1/import lines from req and calls callback for the parsed rows.
+// Parse parses /api/v1/import lines from req and calls callback for the parsed rows.
 //
 // The callback can be called concurrently multiple times for streamed data from reader.
 //
 // callback shouldn't hold rows after returning.
-func ParseStream(r io.Reader, isGzipped bool, callback func(rows []Row) error) error {
+func Parse(r io.Reader, isGzipped bool, callback func(rows []vmimport.Row) error) error {
 	wcr := writeconcurrencylimiter.GetReader(r)
 	defer writeconcurrencylimiter.PutReader(wcr)
 	r = wcr
@@ -138,9 +139,9 @@ var streamContextPool sync.Pool
 var streamContextPoolCh = make(chan *streamContext, cgroup.AvailableCPUs())
 
 type unmarshalWork struct {
-	rows     Rows
+	rows     vmimport.Rows
 	ctx      *streamContext
-	callback func(rows []Row) error
+	callback func(rows []vmimport.Row) error
 	reqBuf   []byte
 }
 
@@ -151,7 +152,7 @@ func (uw *unmarshalWork) reset() {
 	uw.reqBuf = uw.reqBuf[:0]
 }
 
-func (uw *unmarshalWork) runCallback(rows []Row) {
+func (uw *unmarshalWork) runCallback(rows []vmimport.Row) {
 	ctx := uw.ctx
 	if err := uw.callback(rows); err != nil {
 		ctx.callbackErrLock.Lock()