enhance: unified channel name generation and conversion (#34805)

/kind improvement
- issue: #34804

Signed-off-by: SimFG <bang.fu@zilliz.com>

internal/datanode/compaction/mix_compactor_test.go

@@ -18,7 +18,6 @@ package compaction
 
 import (
 	"context"
-	"github.com/milvus-io/milvus/internal/allocator"
 	"math"
 	"testing"
 	"time"
@@ -30,6 +29,7 @@ import (
 
 	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/schemapb"
+	"github.com/milvus-io/milvus/internal/allocator"
 	"github.com/milvus-io/milvus/internal/datanode/io"
 	"github.com/milvus-io/milvus/internal/datanode/metacache"
 	"github.com/milvus-io/milvus/internal/proto/datapb"

internal/rootcoord/create_collection_task.go

@@ -358,8 +358,9 @@ func (t *createCollectionTask) assignChannels() error {
 		return fmt.Errorf("no enough channels, want: %d, got: %d", t.Req.GetShardsNum(), len(chanNames))
 	}
 
-	for i := int32(0); i < t.Req.GetShardsNum(); i++ {
-		vchanNames[i] = fmt.Sprintf("%s_%dv%d", chanNames[i], t.collID, i)
+	shardNum := int(t.Req.GetShardsNum())
+	for i := 0; i < shardNum; i++ {
+		vchanNames[i] = funcutil.GetVirtualChannel(chanNames[i], t.collID, i)
 	}
 	t.channels = collectionChannels{
 		virtualChannels:  vchanNames,

pkg/util/funcutil/func.go

@@ -212,7 +212,11 @@ func GetAvailablePort() int {
 
 // IsPhysicalChannel checks if the channel is a physical channel
 func IsPhysicalChannel(channel string) bool {
-	return strings.Count(channel, "_") == 1
+	i := strings.LastIndex(channel, "_")
+	if i == -1 {
+		return true
+	}
+	return !strings.Contains(channel[i+1:], "v")
 }
 
 // ToPhysicalChannel get physical channel name from virtual channel name
@@ -227,6 +231,10 @@ func ToPhysicalChannel(vchannel string) string {
 	return vchannel[:index]
 }
 
+func GetVirtualChannel(pchannel string, collectionID int64, idx int) string {
+	return fmt.Sprintf("%s_%dv%d", pchannel, collectionID, idx)
+}
+
 // ConvertChannelName assembles channel name according to parameters.
 func ConvertChannelName(chanName string, tokenFrom string, tokenTo string) (string, error) {
 	if tokenFrom == "" {

pkg/util/funcutil/func_test.go

@@ -191,8 +191,8 @@ func Test_ToPhysicalChannel(t *testing.T) {
 	assert.Equal(t, "abc_", ToPhysicalChannel("abc_"))
 	assert.Equal(t, "abc_123", ToPhysicalChannel("abc_123"))
 	assert.Equal(t, "abc_defgsg", ToPhysicalChannel("abc_defgsg"))
-	assert.Equal(t, "abc_123", ToPhysicalChannel("abc_123_456"))
-	assert.Equal(t, "abc__", ToPhysicalChannel("abc___defgsg"))
+	assert.Equal(t, "abc_123", ToPhysicalChannel("abc_123_456v0"))
+	assert.Equal(t, "abc___defgsg", ToPhysicalChannel("abc___defgsg"))
 	assert.Equal(t, "abcdef", ToPhysicalChannel("abcdef"))
 	channel := "by-dev-rootcoord-dml_3_449883080965365748v0"
 	for i := 0; i < 10; i++ {
@@ -816,3 +816,50 @@ func (s *NumRowsWithSchemaSuite) TestErrorCases() {
 func TestNumRowsWithSchema(t *testing.T) {
 	suite.Run(t, new(NumRowsWithSchemaSuite))
 }
+
+func TestChannelConvert(t *testing.T) {
+	t.Run("is physical channel", func(t *testing.T) {
+		{
+			channel := "by-dev-replicate-msg"
+			ok := IsPhysicalChannel(channel)
+			assert.True(t, ok)
+		}
+
+		{
+			channel := "by-dev-rootcoord-dml_2"
+			ok := IsPhysicalChannel(channel)
+			assert.True(t, ok)
+		}
+
+		{
+			channel := "by-dev-rootcoord-dml_2_1001v0"
+			ok := IsPhysicalChannel(channel)
+			assert.False(t, ok)
+		}
+	})
+
+	t.Run("to physical channel", func(t *testing.T) {
+		{
+			channel := "by-dev-rootcoord-dml_2_1001v0"
+			physicalChannel := ToPhysicalChannel(channel)
+			assert.Equal(t, "by-dev-rootcoord-dml_2", physicalChannel)
+		}
+
+		{
+			channel := "by-dev-rootcoord-dml_2"
+			physicalChannel := ToPhysicalChannel(channel)
+			assert.Equal(t, "by-dev-rootcoord-dml_2", physicalChannel)
+		}
+
+		{
+			channel := "by-dev-replicate-msg"
+			physicalChannel := ToPhysicalChannel(channel)
+			assert.Equal(t, "by-dev-replicate-msg", physicalChannel)
+		}
+	})
+
+	t.Run("get virtual channel", func(t *testing.T) {
+		channel := GetVirtualChannel("by-dev-rootcoord-dml_2", 1001, 0)
+		assert.Equal(t, "by-dev-rootcoord-dml_2_1001v0", channel)
+	})
+}

pkg/util/metautil/channel.go

@@ -22,6 +22,7 @@ import (
 	"strconv"
 	"sync"
 
+	"github.com/milvus-io/milvus/pkg/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/util/merr"
 )
 
@@ -100,7 +101,7 @@ func (c Channel) PhysicalName() string {
 }
 
 func (c Channel) VirtualName() string {
-	return fmt.Sprintf("%s_%dv%d", c.PhysicalName(), c.collectionID, c.shardIdx)
+	return funcutil.GetVirtualChannel(c.PhysicalName(), c.collectionID, int(c.shardIdx))
 }
 
 func (c Channel) Equal(ac Channel) bool {