*: label external the request source via sessionvar

DEPS.bzl

@@ -3871,8 +3871,8 @@ def go_deps():
         name = "com_github_tikv_client_go_v2",
         build_file_proto_mode = "disable_global",
         importpath = "github.com/tikv/client-go/v2",
-        sum = "h1:GqsAoNiOFxbCJ8U8Lnts8BvdYd6HDWDsIm/oJY1sIMM=",
-        version = "v2.0.8-0.20230704071705-c0cf773917d9",
+        sum = "h1:pLUQsFZGE3z7OlZddP+WHkb85rLoxPwRd8CknfSw804=",
+        version = "v2.0.8-0.20230707070242-178f6fa01aab",
     )
 
     go_repository(

distsql/request_builder.go

@@ -306,6 +306,7 @@ func (builder *RequestBuilder) SetFromSessionVars(sv *variable.SessionVars) *Req
 	}
 	builder.RequestSource.RequestSourceInternal = sv.InRestrictedSQL
 	builder.RequestSource.RequestSourceType = sv.RequestSourceType
+	builder.RequestSource.ExplicitRequestSourceType = sv.ExplicitRequestSourceType
 	builder.StoreBatchSize = sv.StoreBatchSize
 	builder.Request.ResourceGroupName = sv.ResourceGroupName
 	builder.Request.StoreBusyThreshold = sv.LoadBasedReplicaReadThreshold
@@ -358,6 +359,12 @@ func (builder *RequestBuilder) SetResourceGroupName(name string) *RequestBuilder
 	return builder
 }
 
+// SetExplicitRequestSourceType sets the explicit request source type.
+func (builder *RequestBuilder) SetExplicitRequestSourceType(sourceType string) *RequestBuilder {
+	builder.RequestSource.ExplicitRequestSourceType = sourceType
+	return builder
+}
+
 func (builder *RequestBuilder) verifyTxnScope() error {
 	txnScope := builder.TxnScope
 	if txnScope == "" || txnScope == kv.GlobalReplicaScope || builder.is == nil {

executor/analyze_col.go

@@ -125,6 +125,7 @@ func (e *AnalyzeColumnsExec) buildResp(ranges []*ranger.Range) (distsql.SelectRe
 		SetConcurrency(e.concurrency).
 		SetMemTracker(e.memTracker).
 		SetResourceGroupName(e.ctx.GetSessionVars().ResourceGroupName).
+		SetExplicitRequestSourceType(e.ctx.GetSessionVars().ExplicitRequestSourceType).
 		Build()
 	if err != nil {
 		return nil, err

executor/analyze_idx.go

@@ -156,6 +156,7 @@ func (e *AnalyzeIndexExec) fetchAnalyzeResult(ranges []*ranger.Range, isNullRang
 		SetKeepOrder(true).
 		SetConcurrency(e.concurrency).
 		SetResourceGroupName(e.ctx.GetSessionVars().ResourceGroupName).
+		SetExplicitRequestSourceType(e.ctx.GetSessionVars().ExplicitRequestSourceType).
 		Build()
 	if err != nil {
 		return err

executor/checksum.go

@@ -248,6 +248,7 @@ func (c *checksumContext) buildTableRequest(ctx sessionctx.Context, tableID int6
 		SetStartTS(c.StartTs).
 		SetConcurrency(ctx.GetSessionVars().DistSQLScanConcurrency()).
 		SetResourceGroupName(ctx.GetSessionVars().ResourceGroupName).
+		SetExplicitRequestSourceType(ctx.GetSessionVars().ExplicitRequestSourceType).
 		Build()
 }
 
@@ -266,6 +267,7 @@ func (c *checksumContext) buildIndexRequest(ctx sessionctx.Context, tableID int6
 		SetStartTS(c.StartTs).
 		SetConcurrency(ctx.GetSessionVars().DistSQLScanConcurrency()).
 		SetResourceGroupName(ctx.GetSessionVars().ResourceGroupName).
+		SetExplicitRequestSourceType(ctx.GetSessionVars().ExplicitRequestSourceType).
 		Build()
 }
 

go.mod

@@ -97,7 +97,7 @@ require (
 	github.com/stretchr/testify v1.8.4
 	github.com/tdakkota/asciicheck v0.2.0
 	github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2
-	github.com/tikv/client-go/v2 v2.0.8-0.20230704071705-c0cf773917d9
+	github.com/tikv/client-go/v2 v2.0.8-0.20230707070242-178f6fa01aab
 	github.com/tikv/pd/client v0.0.0-20230613052906-7158cb319935
 	github.com/timakin/bodyclose v0.0.0-20230421092635-574207250966
 	github.com/twmb/murmur3 v1.1.6

go.sum

@@ -977,8 +977,8 @@ github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2 h1:mbAskLJ0oJf
 github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2/go.mod h1:2PfKggNGDuadAa0LElHrByyrz4JPZ9fFx6Gs7nx7ZZU=
 github.com/tiancaiamao/gp v0.0.0-20221230034425-4025bc8a4d4a h1:J/YdBZ46WKpXsxsW93SG+q0F8KI+yFrcIDT4c/RNoc4=
 github.com/tiancaiamao/gp v0.0.0-20221230034425-4025bc8a4d4a/go.mod h1:h4xBhSNtOeEosLJ4P7JyKXX7Cabg7AVkWCK5gV2vOrM=
-github.com/tikv/client-go/v2 v2.0.8-0.20230704071705-c0cf773917d9 h1:GqsAoNiOFxbCJ8U8Lnts8BvdYd6HDWDsIm/oJY1sIMM=
-github.com/tikv/client-go/v2 v2.0.8-0.20230704071705-c0cf773917d9/go.mod h1:4KkKqjJgKlvvWMyNqdnAlYFfV4QjEj1fEb5Hb/FoT88=
+github.com/tikv/client-go/v2 v2.0.8-0.20230707070242-178f6fa01aab h1:pLUQsFZGE3z7OlZddP+WHkb85rLoxPwRd8CknfSw804=
+github.com/tikv/client-go/v2 v2.0.8-0.20230707070242-178f6fa01aab/go.mod h1:4KkKqjJgKlvvWMyNqdnAlYFfV4QjEj1fEb5Hb/FoT88=
 github.com/tikv/pd/client v0.0.0-20230613052906-7158cb319935 h1:a5SATBxu/0Z6qNnz4KXDN91gDA06waaYcHM6dkb6lz4=
 github.com/tikv/pd/client v0.0.0-20230613052906-7158cb319935/go.mod h1:YmNkj9UT8IjwFov9k3oquH0UgIUHniUaQT3jXKgZYbM=
 github.com/timakin/bodyclose v0.0.0-20230421092635-574207250966 h1:quvGphlmUVU+nhpFa4gg4yJyTRJ13reZMDHrKwYw53M=

kv/option.go

@@ -92,6 +92,8 @@ const (
 	RequestSourceInternal
 	// RequestSourceType set request source type of the current statement.
 	RequestSourceType
+	// ExplicitRequestSourceType is a complement of RequestSourceType, it may specified by the client or users.
+	ExplicitRequestSourceType
 	// ReplicaReadAdjuster set the adjust function of cop requsts.
 	ReplicaReadAdjuster
 	// ScanBatchSize set the iter scan batch size.
@@ -188,7 +190,7 @@ const (
 	// Do not classify different tools by now.
 	InternalTxnTools = "tools"
 	// InternalTxnBR is the type of BR usage.
-	InternalTxnBR = InternalTxnTools
+	InternalTxnBR = "br"
 	// InternalTxnTrace handles the trace statement.
 	InternalTxnTrace = "Trace"
 	// InternalTxnTTL is the type of TTL usage

session/session.go

@@ -644,6 +644,7 @@ func (s *session) doCommit(ctx context.Context) error {
 	s.txn.SetOption(kv.EnableAsyncCommit, sessVars.EnableAsyncCommit)
 	s.txn.SetOption(kv.Enable1PC, sessVars.Enable1PC)
 	s.txn.SetOption(kv.ResourceGroupTagger, sessVars.StmtCtx.GetResourceGroupTagger())
+	s.txn.SetOption(kv.ExplicitRequestSourceType, sessVars.ExplicitRequestSourceType)
 	if sessVars.StmtCtx.KvExecCounter != nil {
 		// Bind an interceptor for client-go to count the number of SQL executions of each TiKV.
 		s.txn.SetOption(kv.RPCInterceptor, sessVars.StmtCtx.KvExecCounter.RPCInterceptor())

session/sessiontest/BUILD.bazel

@@ -37,8 +37,12 @@ go_test(
         "//util/memory",
         "//util/sqlexec",
         "@com_github_pingcap_failpoint//:failpoint",
+        "@com_github_pingcap_kvproto//pkg/coprocessor",
+        "@com_github_pingcap_kvproto//pkg/kvrpcpb",
         "@com_github_stretchr_testify//require",
         "@com_github_tikv_client_go_v2//tikv",
+        "@com_github_tikv_client_go_v2//tikvrpc",
+        "@com_github_tikv_client_go_v2//tikvrpc/interceptor",
         "@org_uber_go_goleak//:goleak",
     ],
 )

session/sessiontest/session_test.go

@@ -24,6 +24,8 @@ import (
 	"time"
 
 	"github.com/pingcap/failpoint"
+	"github.com/pingcap/kvproto/pkg/coprocessor"
+	"github.com/pingcap/kvproto/pkg/kvrpcpb"
 	"github.com/pingcap/tidb/config"
 	"github.com/pingcap/tidb/domain"
 	"github.com/pingcap/tidb/expression"
@@ -48,6 +50,8 @@ import (
 	"github.com/pingcap/tidb/util/memory"
 	"github.com/pingcap/tidb/util/sqlexec"
 	"github.com/stretchr/testify/require"
+	"github.com/tikv/client-go/v2/tikvrpc"
+	"github.com/tikv/client-go/v2/tikvrpc/interceptor"
 )
 
 func TestSchemaCheckerSQL(t *testing.T) {
@@ -2434,3 +2438,34 @@ func TestSQLModeOp(t *testing.T) {
 	a = mysql.SetSQLMode(s, mysql.ModeAllowInvalidDates)
 	require.Equal(t, mysql.ModeNoBackslashEscapes|mysql.ModeOnlyFullGroupBy|mysql.ModeAllowInvalidDates, a)
 }
+
+func TestRequestSource(t *testing.T) {
+	store := testkit.CreateMockStore(t, mockstore.WithStoreType(mockstore.MockTiKV))
+	tk := testkit.NewTestKit(t, store)
+	withCheckInterceptor := func(source string) interceptor.RPCInterceptor {
+		return interceptor.NewRPCInterceptor("kv-request-source-verify", func(next interceptor.RPCInterceptorFunc) interceptor.RPCInterceptorFunc {
+			return func(target string, req *tikvrpc.Request) (*tikvrpc.Response, error) {
+				requestSource := ""
+				switch r := req.Req.(type) {
+				case *kvrpcpb.PrewriteRequest:
+					requestSource = r.GetContext().GetRequestSource()
+				case *kvrpcpb.CommitRequest:
+					requestSource = r.GetContext().GetRequestSource()
+				case *coprocessor.Request:
+					requestSource = r.GetContext().GetRequestSource()
+				}
+				require.Equal(t, source, requestSource)
+				return next(target, req)
+			}
+		})
+	}
+	ctx := context.Background()
+	tk.MustExecWithContext(ctx, "use test")
+	tk.MustExecWithContext(ctx, "create table t(a int primary key, b int)")
+	tk.MustExecWithContext(ctx, "set @@tidb_request_source_type = 'lightning'")
+	tk.MustQueryWithContext(ctx, "select @@tidb_request_source_type").Check(testkit.Rows("lightning"))
+	insertCtx := interceptor.WithRPCInterceptor(context.Background(), withCheckInterceptor("external_Insert_lightning"))
+	tk.MustExecWithContext(insertCtx, "insert into t values(1, 1)")
+	selectCtx := interceptor.WithRPCInterceptor(context.Background(), withCheckInterceptor("external_Select_lightning"))
+	tk.MustExecWithContext(selectCtx, "select count(*) from t;")
+}

sessionctx/sessionstates/session_states_test.go

@@ -495,6 +495,18 @@ func TestSessionCtx(t *testing.T) {
 					`└─TableFullScan_4 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo`))
 			},
 		},
+		{
+			// check request source
+			setFunc: func(tk *testkit.TestKit) any {
+				tk.MustExec(`set @@tidb_request_source_type="lightning"`)
+				require.Equal(t, "lightning", tk.Session().GetSessionVars().ExplicitRequestSourceType)
+				return nil
+			},
+			checkFunc: func(tk *testkit.TestKit, param any) {
+				tk.MustExec(`select count(*) from test.t1`)
+				tk.MustQuery(`select @@tidb_request_source_type`).Check(testkit.Rows("lightning"))
+			},
+		},
 	}
 
 	for _, tt := range tests {

sessionctx/variable/BUILD.bazel

@@ -70,6 +70,7 @@ go_library(
         "@com_github_tikv_client_go_v2//kv",
         "@com_github_tikv_client_go_v2//oracle",
         "@com_github_tikv_client_go_v2//tikv",
+        "@com_github_tikv_client_go_v2//util",
         "@com_github_twmb_murmur3//:murmur3",
         "@org_golang_x_exp//maps",
         "@org_golang_x_exp//slices",

sessionctx/variable/session.go

@@ -1324,6 +1324,8 @@ type SessionVars struct {
 
 	// RequestSourceType is the type of inner request.
 	RequestSourceType string
+	// ExplicitRequestSourceType is the type of origin external request.
+	ExplicitRequestSourceType string
 
 	// MemoryDebugModeMinHeapInUse indicated the minimum heapInUse threshold that triggers the memoryDebugMode.
 	MemoryDebugModeMinHeapInUse int64

sessionctx/variable/sysvar.go

@@ -52,6 +52,7 @@ import (
 	"github.com/pingcap/tidb/util/versioninfo"
 	tikvcfg "github.com/tikv/client-go/v2/config"
 	tikvstore "github.com/tikv/client-go/v2/kv"
+	tikvcliutil "github.com/tikv/client-go/v2/util"
 	atomic2 "go.uber.org/atomic"
 	"go.uber.org/zap"
 )
@@ -385,6 +386,12 @@ var defaultSysVars = []*SysVar{
 	{Scope: ScopeSession, Name: TiDBUseAlloc, Value: BoolToOnOff(DefTiDBUseAlloc), Type: TypeBool, ReadOnly: true, GetSession: func(s *SessionVars) (string, error) {
 		return BoolToOnOff(s.preUseChunkAlloc), nil
 	}},
+	{Scope: ScopeSession, Name: TiDBExplicitRequestSourceType, Value: "", Type: TypeEnum, PossibleValues: tikvcliutil.ExplicitTypeList, GetSession: func(s *SessionVars) (string, error) {
+		return s.ExplicitRequestSourceType, nil
+	}, SetSession: func(s *SessionVars, val string) error {
+		s.ExplicitRequestSourceType = val
+		return nil
+	}},
 	/* The system variables below have INSTANCE scope  */
 	{Scope: ScopeInstance, Name: TiDBLogFileMaxDays, Value: strconv.Itoa(config.GetGlobalConfig().Log.File.MaxDays), Type: TypeInt, MinValue: 0, MaxValue: math.MaxInt32, SetGlobal: func(_ context.Context, s *SessionVars, val string) error {
 		maxAge, err := strconv.ParseInt(val, 10, 32)

sessionctx/variable/tidb_vars.go

@@ -275,6 +275,10 @@ const (
 
 	// TiDBUseAlloc indicates whether the last statement used chunk alloc
 	TiDBUseAlloc = "last_sql_use_alloc"
+
+	// TiDBExplicitRequestSourceType indicates the source of the request, it's a complement of RequestSourceType.
+	// The value maybe "lightning", "br", "dumpling" etc.
+	TiDBExplicitRequestSourceType = "tidb_request_source_type"
 )
 
 // TiDB system variable names that both in session and global scope.

store/copr/BUILD.bazel

@@ -55,6 +55,7 @@ go_library(
         "@com_github_tikv_client_go_v2//metrics",
         "@com_github_tikv_client_go_v2//tikv",
         "@com_github_tikv_client_go_v2//tikvrpc",
+        "@com_github_tikv_client_go_v2//tikvrpc/interceptor",
         "@com_github_tikv_client_go_v2//txnkv/txnlock",
         "@com_github_tikv_client_go_v2//txnkv/txnsnapshot",
         "@com_github_tikv_client_go_v2//util",

store/copr/coprocessor.go

@@ -54,6 +54,7 @@ import (
 	"github.com/tikv/client-go/v2/metrics"
 	"github.com/tikv/client-go/v2/tikv"
 	"github.com/tikv/client-go/v2/tikvrpc"
+	"github.com/tikv/client-go/v2/tikvrpc/interceptor"
 	"github.com/tikv/client-go/v2/txnkv/txnlock"
 	"github.com/tikv/client-go/v2/txnkv/txnsnapshot"
 	"github.com/tikv/client-go/v2/util"
@@ -88,6 +89,7 @@ func (c *CopClient) Send(ctx context.Context, req *kv.Request, variables interfa
 	}
 	ctx = context.WithValue(ctx, tikv.TxnStartKey(), req.StartTs)
 	ctx = context.WithValue(ctx, util.RequestSourceKey, req.RequestSource)
+	ctx = interceptor.WithRPCInterceptor(ctx, interceptor.GetRPCInterceptorFromCtx(ctx))
 	enabledRateLimitAction := option.EnabledRateLimitAction
 	sessionMemTracker := option.SessionMemTracker
 	it, errRes := c.BuildCopIterator(ctx, req, vars, option)

store/driver/txn/txn_driver.go

@@ -270,6 +270,8 @@ func (txn *tikvTxn) SetOption(opt int, val interface{}) {
 		txn.KVTxn.SetRequestSourceInternal(val.(bool))
 	case kv.RequestSourceType:
 		txn.KVTxn.SetRequestSourceType(val.(string))
+	case kv.ExplicitRequestSourceType:
+		txn.KVTxn.SetExplicitRequestSourceType(val.(string))
 	case kv.ReplicaReadAdjuster:
 		txn.KVTxn.GetSnapshot().SetReplicaReadAdjuster(val.(txnkv.ReplicaReadAdjuster))
 	case kv.TxnSource: