69 lines
2.4 KiB
Go
69 lines
2.4 KiB
Go
package examples
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/yedf/dtm/dtmcli"
|
|
"github.com/yedf/dtm/dtmgrpc"
|
|
"google.golang.org/grpc/codes"
|
|
"google.golang.org/grpc/status"
|
|
)
|
|
|
|
func init() {
|
|
addSample("grpc_saga_barrier", func() string {
|
|
req := dtmcli.MustMarshal(&TransReq{Amount: 30})
|
|
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/TransInRevertBSaga", req)
|
|
err := saga.Submit()
|
|
dtmcli.FatalIfError(err)
|
|
return saga.Gid
|
|
})
|
|
}
|
|
|
|
func sagaGrpcBarrierAdjustBalance(db dtmcli.DB, uid int, amount int, result string) error {
|
|
if result == "FAILURE" {
|
|
return status.New(codes.Aborted, "user rollback").Err()
|
|
}
|
|
_, err := dtmcli.DBExec(db, "update dtm_busi.user_account set balance = balance + ? where user_id = ?", amount, uid)
|
|
return err
|
|
|
|
}
|
|
|
|
func (s *busiServer) TransInBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*dtmgrpc.BusiReply, error) {
|
|
req := TransReq{}
|
|
dtmcli.MustUnmarshal(in.BusiData, &req)
|
|
barrier := MustBarrierFromGrpc(in)
|
|
return &dtmgrpc.BusiReply{}, barrier.Call(txGet(), func(tx dtmcli.DB) error {
|
|
return sagaGrpcBarrierAdjustBalance(tx, 2, req.Amount, req.TransInResult)
|
|
})
|
|
}
|
|
|
|
func (s *busiServer) TransOutBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*dtmgrpc.BusiReply, error) {
|
|
req := TransReq{}
|
|
dtmcli.MustUnmarshal(in.BusiData, &req)
|
|
barrier := MustBarrierFromGrpc(in)
|
|
return &dtmgrpc.BusiReply{}, barrier.Call(txGet(), func(db dtmcli.DB) error {
|
|
return sagaGrpcBarrierAdjustBalance(db, 1, -req.Amount, req.TransOutResult)
|
|
})
|
|
}
|
|
|
|
func (s *busiServer) TransInRevertBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*dtmgrpc.BusiReply, error) {
|
|
req := TransReq{}
|
|
dtmcli.MustUnmarshal(in.BusiData, &req)
|
|
barrier := MustBarrierFromGrpc(in)
|
|
return &dtmgrpc.BusiReply{}, barrier.Call(txGet(), func(db dtmcli.DB) error {
|
|
return sagaGrpcBarrierAdjustBalance(db, 2, -req.Amount, "")
|
|
})
|
|
}
|
|
|
|
func (s *busiServer) TransOutRevertBSaga(ctx context.Context, in *dtmgrpc.BusiRequest) (*dtmgrpc.BusiReply, error) {
|
|
req := TransReq{}
|
|
dtmcli.MustUnmarshal(in.BusiData, &req)
|
|
barrier := MustBarrierFromGrpc(in)
|
|
return &dtmgrpc.BusiReply{}, barrier.Call(txGet(), func(db dtmcli.DB) error {
|
|
return sagaGrpcBarrierAdjustBalance(db, 1, req.Amount, "")
|
|
})
|
|
}
|