grpc barrier ok

dtmcli/barrier.go

@@ -3,13 +3,12 @@ package dtmcli
 import (
 	"context"
 	"database/sql"
-	"encoding/json"
 	"fmt"
 	"net/url"
 )
 
 // BusiFunc type for busi func
-type BusiFunc func(db *sql.Tx) (interface{}, error)
+type BusiFunc func(db *sql.Tx) error
 
 // BranchBarrier every branch info
 type BranchBarrier struct {
@@ -55,11 +54,9 @@ func insertBarrier(tx *sql.Tx, transType string, gid string, branchID string, br
 // transInfo: 事务信息
 // bisiCall: 业务函数，仅在必要时被调用
 // 返回值:
-// 如果正常调用，返回bisiCall的结果
+// 如果发生悬挂，则busiCall不会被调用，直接返回错误 ErrFailure，全局事务尽早进行回滚
-// 如果发生重复调用，则busiCall不会被重复调用，直接对保存在数据库中上一次的结果，进行unmarshal，通常是一个map[string]interface{}，直接作为http的resp
+// 如果正常调用，重复调用，空补偿，返回的错误值为nil，正常往下进行
-// 如果发生悬挂，则busiCall不会被调用，直接返回错误 {"dtm_result": "FAILURE"}
+func (bb *BranchBarrier) Call(db *sql.DB, busiCall BusiFunc) (rerr error) {
-// 如果发生空补偿，则busiCall不会被调用，直接返回 {"dtm_result": "SUCCESS"}
-func (bb *BranchBarrier) Call(db *sql.DB, busiCall BusiFunc) (res interface{}, rerr error) {
 	bb.BarrierID = bb.BarrierID + 1
 	bid := fmt.Sprintf("%02d", bb.BarrierID)
 	tx, rerr := db.BeginTx(context.Background(), &sql.TxOptions{})
@@ -67,7 +64,7 @@ func (bb *BranchBarrier) Call(db *sql.DB, busiCall BusiFunc) (res interface{}, r
 		return
 	}
 	defer func() {
-		Logf("result is %v error is %v", res, rerr)
+		Logf("barrier call error is %v", rerr)
 		if x := recover(); x != nil {
 			tx.Rollback()
 			panic(x)
@@ -86,33 +83,18 @@ func (bb *BranchBarrier) Call(db *sql.DB, busiCall BusiFunc) (res interface{}, r
 	currentAffected, rerr := insertBarrier(tx, ti.TransType, ti.Gid, ti.BranchID, ti.BranchType, bid, ti.BranchType)
 	Logf("originAffected: %d currentAffected: %d", originAffected, currentAffected)
 	if (ti.BranchType == "cancel" || ti.BranchType == "compensate") && originAffected > 0 { // 这个是空补偿，返回成功
-		res = ResultSuccess
 		return
 	} else if currentAffected == 0 { // 插入不成功
 		var result sql.NullString
-		err := StxQueryRow(tx, "select result from dtm_barrier.barrier where trans_type=? and gid=? and branch_id=? and branch_type=? and barrier_id=? and reason=?",
+		err := StxQueryRow(tx, "select 1 from dtm_barrier.barrier where trans_type=? and gid=? and branch_id=? and branch_type=? and barrier_id=? and reason=?",
 			ti.TransType, ti.Gid, ti.BranchID, ti.BranchType, bid, ti.BranchType).Scan(&result)
-		if err == sql.ErrNoRows { // 这个是悬挂操作，返回失败，AP收到这个返回，会尽快回滚
+		if err == sql.ErrNoRows { // 不是当前分支插入的，那么是cancel插入的，因此是悬挂操作，返回失败，AP收到这个返回，会尽快回滚
-			res = ResultFailure
+			rerr = ErrFailure
 			return
 		}
-		if err != nil {
+		rerr = err //幂等和空补偿，直接返回
-			rerr = err
-			return
-		}
-		if result.Valid { // 数据库里有上一次结果，返回上一次的结果
-			rerr = json.Unmarshal([]byte(result.String), &res)
-			return
-		}
-		// 数据库里没有上次的结果，属于重复空补偿，直接返回成功
-		res = ResultSuccess
 		return
 	}
-	res, rerr = busiCall(tx)
+	rerr = busiCall(tx)
-	if rerr == nil { // 正确返回了，需要将结果保存到数据库
-		sval := MustMarshalString(res)
-		_, rerr = StxExec(tx, "update dtm_barrier.barrier set result=? where trans_type=? and gid=? and branch_id=? and branch_type=?", sval,
-			ti.TransType, ti.Gid, ti.BranchID, ti.BranchType)
-	}
 	return
 }

dtmcli/barrier.mysql.sql

@@ -9,7 +9,6 @@ create table if not exists dtm_barrier.barrier(
   branch_type varchar(45) default '',
   barrier_id varchar(45) default '',
   reason varchar(45) default '' comment 'the branch type who insert this record',
-  result varchar(2047) default null comment 'the business result of this branch',
   create_time datetime DEFAULT now(),
   update_time datetime DEFAULT now(),
   key(create_time),

examples/grpc_saga_barrier.go

@@ -4,9 +4,10 @@ import (
 	"context"
 	"database/sql"
 
-	"github.com/gin-gonic/gin"
 	"github.com/yedf/dtm/dtmcli"
 	"github.com/yedf/dtm/dtmgrpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/emptypb"
 )
 
@@ -16,75 +17,54 @@ func init() {
 		gid := dtmgrpc.MustGenGid(DtmGrpcServer)
 		saga := dtmgrpc.NewSaga(DtmGrpcServer, gid).
 			Add(BusiGrpc+"/examples.Busi/TransOutBSaga", BusiGrpc+"/examples.Busi/TransOutRevertBSaga", req).
-			Add(BusiGrpc+"/examples.Busi/TransInBSaga", BusiGrpc+"/examples.Busi/TransOutRevertBSaga", req)
+			Add(BusiGrpc+"/examples.Busi/TransInBSaga", BusiGrpc+"/examples.Busi/TransInRevertBSaga", req)
 		err := saga.Submit()
 		dtmcli.FatalIfError(err)
 		return saga.Gid
 	})
 }
 
-func sagaGrpcBarrierAdjustBalance(sdb *sql.Tx, uid int, amount int) (interface{}, error) {
+func sagaGrpcBarrierAdjustBalance(sdb *sql.Tx, uid int, amount int, result string) error {
+	if result == "FAILURE" {
+		return status.New(codes.Aborted, "user rollback").Err()
+	}
 	_, err := dtmcli.StxExec(sdb, "update dtm_busi.user_account set balance = balance + ? where user_id = ?", amount, uid)
-	return dtmcli.ResultSuccess, err
+	return err
 
 }
 
 func (s *busiServer) TransInBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*emptypb.Empty, error) {
 	req := TransReq{}
 	dtmcli.MustUnmarshal(in.BusiData, &req)
-	return &emptypb.Empty{}, handleGrpcBusiness(in, MainSwitch.TransInResult.Fetch(), req.TransInResult, dtmcli.GetFuncName())
+	barrier := MustBarrierFromGrpc(in)
+	return &emptypb.Empty{}, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
+		return sagaGrpcBarrierAdjustBalance(sdb, 2, req.Amount, req.TransInResult)
+	})
 }
 
 func (s *busiServer) TransOutBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*emptypb.Empty, error) {
 	req := TransReq{}
 	dtmcli.MustUnmarshal(in.BusiData, &req)
-	return &emptypb.Empty{}, handleGrpcBusiness(in, MainSwitch.TransOutResult.Fetch(), req.TransOutResult, dtmcli.GetFuncName())
+	barrier := MustBarrierFromGrpc(in)
+	return &emptypb.Empty{}, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
+		return sagaGrpcBarrierAdjustBalance(sdb, 1, -req.Amount, req.TransOutResult)
+	})
 }
 
 func (s *busiServer) TransInRevertBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*emptypb.Empty, error) {
 	req := TransReq{}
 	dtmcli.MustUnmarshal(in.BusiData, &req)
-	return &emptypb.Empty{}, handleGrpcBusiness(in, MainSwitch.TransInRevertResult.Fetch(), "", dtmcli.GetFuncName())
+	barrier := MustBarrierFromGrpc(in)
+	return &emptypb.Empty{}, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
+		return sagaGrpcBarrierAdjustBalance(sdb, 2, -req.Amount, "")
+	})
 }
 
 func (s *busiServer) TransOutRevertBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*emptypb.Empty, error) {
 	req := TransReq{}
 	dtmcli.MustUnmarshal(in.BusiData, &req)
-	return &emptypb.Empty{}, handleGrpcBusiness(in, MainSwitch.TransOutRevertResult.Fetch(), "", dtmcli.GetFuncName())
+	barrier := MustBarrierFromGrpc(in)
-}
+	return &emptypb.Empty{}, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
-
+		return sagaGrpcBarrierAdjustBalance(sdb, 1, req.Amount, "")
-func sagaBarrierTransIn(c *gin.Context) (interface{}, error) {
-	req := reqFrom(c)
-	if req.TransInResult != "" {
-		return req.TransInResult, nil
-	}
-	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
-		return sagaBarrierAdjustBalance(sdb, 1, req.Amount)
-	})
-}
-
-func sagaBarrierTransInCompensate(c *gin.Context) (interface{}, error) {
-	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
-		return sagaBarrierAdjustBalance(sdb, 1, -reqFrom(c).Amount)
-	})
-}
-
-func sagaBarrierTransOut(c *gin.Context) (interface{}, error) {
-	req := reqFrom(c)
-	if req.TransInResult != "" {
-		return req.TransInResult, nil
-	}
-	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
-		return sagaBarrierAdjustBalance(sdb, 2, -req.Amount)
-	})
-}
-
-func sagaBarrierTransOutCompensate(c *gin.Context) (interface{}, error) {
-	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
-		return sagaBarrierAdjustBalance(sdb, 2, reqFrom(c).Amount)
 	})
 }

examples/http_saga_barrier.go

@@ -28,9 +28,9 @@ func init() {
 	})
 }
 
-func sagaBarrierAdjustBalance(sdb *sql.Tx, uid int, amount int) (interface{}, error) {
+func sagaBarrierAdjustBalance(sdb *sql.Tx, uid int, amount int) error {
 	_, err := dtmcli.StxExec(sdb, "update dtm_busi.user_account set balance = balance + ? where user_id = ?", amount, uid)
-	return dtmcli.ResultSuccess, err
+	return err
 
 }
 
@@ -40,14 +40,14 @@ func sagaBarrierTransIn(c *gin.Context) (interface{}, error) {
 		return req.TransInResult, nil
 	}
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return sagaBarrierAdjustBalance(sdb, 1, req.Amount)
 	})
 }
 
 func sagaBarrierTransInCompensate(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return sagaBarrierAdjustBalance(sdb, 1, -reqFrom(c).Amount)
 	})
 }
@@ -58,14 +58,14 @@ func sagaBarrierTransOut(c *gin.Context) (interface{}, error) {
 		return req.TransInResult, nil
 	}
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return sagaBarrierAdjustBalance(sdb, 2, -req.Amount)
 	})
 }
 
 func sagaBarrierTransOutCompensate(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return sagaBarrierAdjustBalance(sdb, 2, reqFrom(c).Amount)
 	})
 }

examples/http_tcc_barrier.go

@@ -37,23 +37,23 @@ func init() {
 const transInUID = 1
 const transOutUID = 2
 
-func adjustTrading(sdb *sql.Tx, uid int, amount int) (interface{}, error) {
+func adjustTrading(sdb *sql.Tx, uid int, amount int) error {
 	affected, err := dtmcli.StxExec(sdb, "update dtm_busi.user_account_trading set trading_balance=trading_balance + ? where user_id=? and trading_balance + ? + (select balance from dtm_busi.user_account where id=?) >= 0", amount, uid, amount, uid)
 	if err == nil && affected == 0 {
-		return nil, fmt.Errorf("update error, maybe balance not enough")
+		return fmt.Errorf("update error, maybe balance not enough")
 	}
-	return dtmcli.MS{"dtm_server": "SUCCESS"}, nil
+	return err
 }
 
-func adjustBalance(sdb *sql.Tx, uid int, amount int) (interface{}, error) {
+func adjustBalance(sdb *sql.Tx, uid int, amount int) error {
 	affected, err := dtmcli.StxExec(sdb, "update dtm_busi.user_account_trading set trading_balance = trading_balance + ? where user_id=?;", -amount, uid)
 	if err == nil && affected == 1 {
 		affected, err = dtmcli.StxExec(sdb, "update dtm_busi.user_account set balance=balance+? where user_id=?", amount, uid)
 	}
 	if err == nil && affected == 0 {
-		return nil, fmt.Errorf("update 0 rows")
+		return fmt.Errorf("update 0 rows")
 	}
-	return dtmcli.ResultSuccess, err
+	return err
 }
 
 // TCC下，转入
@@ -63,21 +63,21 @@ func tccBarrierTransInTry(c *gin.Context) (interface{}, error) {
 		return req.TransInResult, nil
 	}
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return adjustTrading(sdb, transInUID, req.Amount)
 	})
 }
 
 func tccBarrierTransInConfirm(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return adjustBalance(sdb, transInUID, reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransInCancel(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return adjustTrading(sdb, transInUID, -reqFrom(c).Amount)
 	})
 }
@@ -88,14 +88,14 @@ func tccBarrierTransOutTry(c *gin.Context) (interface{}, error) {
 		return req.TransInResult, nil
 	}
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return adjustTrading(sdb, transOutUID, -req.Amount)
 	})
 }
 
 func tccBarrierTransOutConfirm(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return adjustBalance(sdb, transOutUID, -reqFrom(c).Amount)
 	})
 }
@@ -103,7 +103,7 @@ func tccBarrierTransOutConfirm(c *gin.Context) (interface{}, error) {
 // TccBarrierTransOutCancel will be use in test
 func TccBarrierTransOutCancel(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return barrier.Call(sdbGet(), func(sdb *sql.Tx) (interface{}, error) {
+	return dtmcli.ResultSuccess, barrier.Call(sdbGet(), func(sdb *sql.Tx) error {
 		return adjustTrading(sdb, transOutUID, reqFrom(c).Amount)
 	})
 }

test/dtmsvr_test.go

@@ -118,28 +118,21 @@ func TestSqlDB(t *testing.T) {
 		BranchType: "action",
 	}
 	db.Must().Exec("insert ignore into dtm_barrier.barrier(trans_type, gid, branch_id, branch_type, reason) values('saga', 'gid1', 'branch_id1', 'action', 'saga')")
-	_, err := barrier.Call(db.ToSQLDB(), func(db *sql.Tx) (interface{}, error) {
+	err := barrier.Call(db.ToSQLDB(), func(db *sql.Tx) error {
 		dtmcli.Logf("rollback gid2")
-		return nil, fmt.Errorf("gid2 error")
+		return fmt.Errorf("gid2 error")
 	})
 	asserts.Error(err, fmt.Errorf("gid2 error"))
 	dbr := db.Model(&BarrierModel{}).Where("gid=?", "gid1").Find(&[]BarrierModel{})
 	asserts.Equal(dbr.RowsAffected, int64(1))
 	dbr = db.Model(&BarrierModel{}).Where("gid=?", "gid2").Find(&[]BarrierModel{})
 	asserts.Equal(dbr.RowsAffected, int64(0))
-	gid2Res := dtmcli.M{"result": "first"}
 	barrier.BarrierID = 0
-	_, err = barrier.Call(db.ToSQLDB(), func(db *sql.Tx) (interface{}, error) {
+	err = barrier.Call(db.ToSQLDB(), func(db *sql.Tx) error {
 		dtmcli.Logf("submit gid2")
-		return gid2Res, nil
+		return nil
 	})
 	asserts.Nil(err)
 	dbr = db.Model(&BarrierModel{}).Where("gid=?", "gid2").Find(&[]BarrierModel{})
 	asserts.Equal(dbr.RowsAffected, int64(1))
-	barrier.BarrierID = 0
-	newResult, err := barrier.Call(db.ToSQLDB(), func(db *sql.Tx) (interface{}, error) {
-		dtmcli.Logf("submit gid2")
-		return dtmcli.MS{"result": "ignored"}, nil
-	})
-	asserts.Equal(newResult, gid2Res)
 }