table: provide some binlog related methods for binlog in `MutateConte…

…xt` (pingcap#54433)

ref pingcap#54392, ref pingcap#54397

pkg/lightning/backend/kv/session.go

@@ -363,7 +363,7 @@ func NewSession(options *encode.SessionOptions, logger log.Logger) *Session {
 		Session:             s,
 		PlanCtxExtendedImpl: planctximpl.NewPlanCtxExtendedImpl(s),
 	}
-	s.tblctx = tbctximpl.NewTableContextImpl(s, s.exprCtx)
+	s.tblctx = tbctximpl.NewTableContextImpl(s)
 	s.txn.kvPairs = &Pairs{}
 
 	return s

pkg/session/bootstrap_test.go

@@ -156,7 +156,7 @@ func TestBootstrapWithError(t *testing.T) {
 		}
 		se.exprctx = contextsession.NewSessionExprContext(se)
 		se.pctx = newPlanContextImpl(se)
-		se.tblctx = tbctximpl.NewTableContextImpl(se, se.exprctx)
+		se.tblctx = tbctximpl.NewTableContextImpl(se)
 		globalVarsAccessor := variable.NewMockGlobalAccessor4Tests()
 		se.GetSessionVars().GlobalVarsAccessor = globalVarsAccessor
 		se.txn.init()

pkg/session/session.go

@@ -3701,7 +3701,7 @@ func createSessionWithOpt(store kv.Storage, opt *Opt) (*session, error) {
 	s.sessionVars = variable.NewSessionVars(s)
 	s.exprctx = contextsession.NewSessionExprContext(s)
 	s.pctx = newPlanContextImpl(s)
-	s.tblctx = tbctximpl.NewTableContextImpl(s, s.exprctx)
+	s.tblctx = tbctximpl.NewTableContextImpl(s)
 
 	if opt != nil && opt.PreparedPlanCache != nil {
 		s.sessionPlanCache = opt.PreparedPlanCache
@@ -3764,7 +3764,7 @@ func CreateSessionWithDomain(store kv.Storage, dom *domain.Domain) (*session, er
 	}
 	s.exprctx = contextsession.NewSessionExprContext(s)
 	s.pctx = newPlanContextImpl(s)
-	s.tblctx = tbctximpl.NewTableContextImpl(s, s.exprctx)
+	s.tblctx = tbctximpl.NewTableContextImpl(s)
 	s.mu.values = make(map[fmt.Stringer]any)
 	s.lockedTables = make(map[int64]model.TableLockTpInfo)
 	domain.BindDomain(s, dom)

pkg/table/context/buffers.go

@@ -80,10 +80,15 @@ func (b *EncodeRowBuffer) WriteMemBufferEncoded(
 	return memBuffer.SetWithFlags(key, encoded, flags...)
 }
 
-// GetColDataBuffer returns the buffer for column data.
-// TODO: make sure the inner buffer is not used outside directly.
-func (b *EncodeRowBuffer) GetColDataBuffer() ([]int64, []types.Datum) {
-	return b.colIDs, b.row
+// EncodeBinlogRowData encodes the row data for binlog and returns the encoded row value.
+// The returned slice is not referenced in the buffer, so you can cache and modify them freely.
+func (b *EncodeRowBuffer) EncodeBinlogRowData(loc *time.Location, ec errctx.Context) ([]byte, error) {
+	value, err := tablecodec.EncodeOldRow(loc, b.row, b.colIDs, nil, nil)
+	err = ec.HandleError(err)
+	if err != nil {
+		return nil, err
+	}
+	return value, nil
 }
 
 // CheckRowBuffer is used to check row constraints

pkg/table/context/buffers_test.go

@@ -17,6 +17,7 @@ package context
 import (
 	"testing"
 	"time"
+	"unsafe"
 
 	"github.com/pingcap/tidb/pkg/errctx"
 	"github.com/pingcap/tidb/pkg/kv"
@@ -97,6 +98,7 @@ func TestEncodeRow(t *testing.T) {
 			oldFormat: true,
 		},
 	} {
+		// test encode and write to mem buffer
 		cfg := RowEncodingConfig{
 			RowEncoder:                &rowcodec.Encoder{Enable: !c.oldFormat},
 			IsRowLevelChecksumEnabled: c.rowLevelChecksum,
@@ -115,19 +117,31 @@ func TestEncodeRow(t *testing.T) {
 
 		memBuffer := &mockMemBuffer{}
 		if len(c.flags) == 0 {
-			memBuffer.On("Set", kv.Key("key1"), expectedVal).Return(nil).Once()
+			memBuffer.On("Set", kv.Key("key1"), expectedVal).
+				Return(nil).Once()
 		} else {
-			memBuffer.On("SetWithFlags", kv.Key("key1"), expectedVal, c.flags).Return(nil).Once()
+			memBuffer.On("SetWithFlags", kv.Key("key1"), expectedVal, c.flags).
+				Return(nil).Once()
 		}
 		err = buffer.WriteMemBufferEncoded(
 			cfg, c.loc, errctx.StrictNoWarningContext,
 			memBuffer, kv.Key("key1"), c.flags...,
 		)
 		require.NoError(t, err)
 		memBuffer.AssertExpectations(t)
-
 		// the encoding result should be cached as a buffer
 		require.Equal(t, expectedVal, buffer.writeStmtBufs.RowValBuf)
+
+		// test encode val for binlog
+		expectedVal, err =
+			tablecodec.EncodeOldRow(c.loc, []types.Datum{d1, d2, d3}, []int64{1, 2, 3}, nil, nil)
+		require.NoError(t, err)
+		encoded, err := buffer.EncodeBinlogRowData(c.loc, errctx.StrictNoWarningContext)
+		require.NoError(t, err)
+		require.Equal(t, expectedVal, encoded)
+		// the encoded should not be referenced by any inner buffer
+		require.True(t, unsafe.SliceData(encoded) != unsafe.SliceData(buffer.writeStmtBufs.RowValBuf))
+		require.True(t, unsafe.SliceData(encoded) != unsafe.SliceData(buffer.writeStmtBufs.IndexKeyBuf))
 	}
 }
 
@@ -158,11 +172,6 @@ func TestEncodeBufferReserve(t *testing.T) {
 	require.Equal(t, 4, len(buffer.writeStmtBufs.AddRowValues))
 	addRowValuesCap := cap(buffer.writeStmtBufs.AddRowValues)
 
-	// GetColDataBuffer should return the underlying buffer
-	colIDs, row := buffer.GetColDataBuffer()
-	require.Equal(t, buffer.colIDs, colIDs)
-	require.Equal(t, buffer.row, row)
-
 	// reset should not shrink the capacity
 	buffer.Reset(2)
 	require.Equal(t, 6, cap(buffer.colIDs))

pkg/table/context/table.go

@@ -47,13 +47,17 @@ type MutateContext interface {
 	// If the active parameter is true, call this function will wait for the pending txn
 	// to become valid.
 	Txn(active bool) (kv.Transaction, error)
-	// StmtGetMutation gets the binlog mutation for current statement.
-	StmtGetMutation(int64) *binlog.TableMutation
+	// BinlogEnabled returns whether the binlog is enabled.
+	BinlogEnabled() bool
+	// GetBinlogMutation returns a `binlog.TableMutation` object for a table.
+	GetBinlogMutation(tblID int64) *binlog.TableMutation
 	// GetDomainInfoSchema returns the latest information schema in domain
 	GetDomainInfoSchema() infoschema.MetaOnlyInfoSchema
 	// TxnRecordTempTable record the temporary table to the current transaction.
 	// This method will be called when the temporary table is modified or should allocate id in the transaction.
 	TxnRecordTempTable(tbl *model.TableInfo) tableutil.TempTable
+	// InRestrictedSQL returns whether the current context is used in restricted SQL.
+	InRestrictedSQL() bool
 	// GetRowEncodingConfig returns the RowEncodingConfig.
 	GetRowEncodingConfig() RowEncodingConfig
 	// GetMutateBuffers returns the MutateBuffers,

pkg/table/contextimpl/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "contextimpl",
@@ -12,5 +12,21 @@ go_library(
         "//pkg/sessionctx/variable",
         "//pkg/table/context",
         "//pkg/util/tableutil",
+        "@com_github_pingcap_tipb//go-binlog",
+    ],
+)
+
+go_test(
+    name = "contextimpl_test",
+    timeout = "short",
+    srcs = ["table_test.go"],
+    flaky = True,
+    deps = [
+        ":contextimpl",
+        "//pkg/sessionctx/binloginfo",
+        "//pkg/testkit",
+        "//pkg/util/mock",
+        "@com_github_pingcap_tipb//go-binlog",
+        "@com_github_stretchr_testify//require",
     ],
 )

pkg/table/contextimpl/table.go

@@ -21,6 +21,7 @@ import (
 	"github.com/pingcap/tidb/pkg/sessionctx/variable"
 	"github.com/pingcap/tidb/pkg/table/context"
 	"github.com/pingcap/tidb/pkg/util/tableutil"
+	"github.com/pingcap/tipb/go-binlog"
 )
 
 var _ context.MutateContext = &TableContextImpl{}
@@ -29,18 +30,16 @@ var _ context.AllocatorContext = &TableContextImpl{}
 // TableContextImpl is used to provide context for table operations.
 type TableContextImpl struct {
 	sessionctx.Context
-	exprCtx exprctx.ExprContext
 	// mutateBuffers is a memory pool for table related memory allocation that aims to reuse memory
 	// and saves allocation
 	// The buffers are supposed to be used inside AddRecord/UpdateRecord/RemoveRecord.
 	mutateBuffers *context.MutateBuffers
 }
 
 // NewTableContextImpl creates a new TableContextImpl.
-func NewTableContextImpl(sctx sessionctx.Context, exprCtx exprctx.ExprContext) *TableContextImpl {
+func NewTableContextImpl(sctx sessionctx.Context) *TableContextImpl {
 	return &TableContextImpl{
 		Context:       sctx,
-		exprCtx:       exprCtx,
 		mutateBuffers: context.NewMutateBuffers(sctx.GetSessionVars().GetWriteStmtBufs()),
 	}
 }
@@ -53,7 +52,22 @@ func (ctx *TableContextImpl) TxnRecordTempTable(tbl *model.TableInfo) tableutil.
 
 // GetExprCtx returns the ExprContext
 func (ctx *TableContextImpl) GetExprCtx() exprctx.ExprContext {
-	return ctx.exprCtx
+	return ctx.Context.GetExprCtx()
+}
+
+// InRestrictedSQL returns whether the current context is used in restricted SQL.
+func (ctx *TableContextImpl) InRestrictedSQL() bool {
+	return ctx.vars().StmtCtx.InRestrictedSQL
+}
+
+// BinlogEnabled returns whether the binlog is enabled.
+func (ctx *TableContextImpl) BinlogEnabled() bool {
+	return ctx.vars().BinlogClient != nil
+}
+
+// GetBinlogMutation returns a `binlog.TableMutation` object for a table.
+func (ctx *TableContextImpl) GetBinlogMutation(tblID int64) *binlog.TableMutation {
+	return ctx.Context.StmtGetMutation(tblID)
 }
 
 // GetRowEncodingConfig returns the RowEncodingConfig.

pkg/table/contextimpl/table_test.go

@@ -0,0 +1,71 @@
+// Copyright 2024 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package contextimpl_test
+
+import (
+	"testing"
+
+	"github.com/pingcap/tidb/pkg/sessionctx/binloginfo"
+	"github.com/pingcap/tidb/pkg/table/contextimpl"
+	"github.com/pingcap/tidb/pkg/testkit"
+	"github.com/pingcap/tidb/pkg/util/mock"
+	"github.com/pingcap/tipb/go-binlog"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMutateContextImplFields(t *testing.T) {
+	sctx := mock.NewContext()
+	sctx.Mutations = make(map[int64]*binlog.TableMutation)
+	ctx := contextimpl.NewTableContextImpl(sctx)
+	// expression
+	require.True(t, sctx.GetExprCtx() == ctx.GetExprCtx())
+	// binlog
+	sctx.GetSessionVars().BinlogClient = nil
+	require.False(t, ctx.BinlogEnabled())
+	sctx.GetSessionVars().BinlogClient = binloginfo.MockPumpsClient(&testkit.MockPumpClient{})
+	require.True(t, ctx.BinlogEnabled())
+	binlogMutation := ctx.GetBinlogMutation(1234)
+	require.NotNil(t, binlogMutation)
+	require.Same(t, sctx.StmtGetMutation(1234), binlogMutation)
+	// restricted SQL
+	sctx.GetSessionVars().StmtCtx.InRestrictedSQL = false
+	require.False(t, ctx.InRestrictedSQL())
+	sctx.GetSessionVars().StmtCtx.InRestrictedSQL = true
+	require.True(t, ctx.InRestrictedSQL())
+	// encoding config
+	sctx.GetSessionVars().EnableRowLevelChecksum = true
+	sctx.GetSessionVars().RowEncoder.Enable = true
+	sctx.GetSessionVars().InRestrictedSQL = false
+	cfg := ctx.GetRowEncodingConfig()
+	require.True(t, cfg.IsRowLevelChecksumEnabled)
+	require.Equal(t, sctx.GetSessionVars().IsRowLevelChecksumEnabled(), cfg.IsRowLevelChecksumEnabled)
+	require.True(t, cfg.IsRowLevelChecksumEnabled)
+	require.Same(t, &sctx.GetSessionVars().RowEncoder, cfg.RowEncoder)
+	sctx.GetSessionVars().RowEncoder.Enable = false
+	cfg = ctx.GetRowEncodingConfig()
+	require.False(t, cfg.IsRowLevelChecksumEnabled)
+	require.Equal(t, sctx.GetSessionVars().IsRowLevelChecksumEnabled(), cfg.IsRowLevelChecksumEnabled)
+	require.Same(t, &sctx.GetSessionVars().RowEncoder, cfg.RowEncoder)
+	require.False(t, cfg.IsRowLevelChecksumEnabled)
+	sctx.GetSessionVars().RowEncoder.Enable = true
+	sctx.GetSessionVars().InRestrictedSQL = true
+	require.Equal(t, sctx.GetSessionVars().IsRowLevelChecksumEnabled(), cfg.IsRowLevelChecksumEnabled)
+	require.False(t, cfg.IsRowLevelChecksumEnabled)
+	sctx.GetSessionVars().InRestrictedSQL = false
+	sctx.GetSessionVars().EnableRowLevelChecksum = false
+	require.Equal(t, sctx.GetSessionVars().IsRowLevelChecksumEnabled(), cfg.IsRowLevelChecksumEnabled)
+	// mutate buffers
+	require.NotNil(t, ctx.GetMutateBuffers())
+}

pkg/table/tables/BUILD.bazel

@@ -34,6 +34,7 @@ go_library(
         "//pkg/sessionctx/variable",
         "//pkg/statistics",
         "//pkg/table",
+        "//pkg/table/context",
         "//pkg/tablecodec",
         "//pkg/types",
         "//pkg/util",