93 lines
3.0 KiB
Go
93 lines
3.0 KiB
Go
package examples
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import (
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"database/sql"
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"fmt"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/sirupsen/logrus"
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"github.com/yedf/dtm/common"
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"github.com/yedf/dtm/dtmcli"
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"gorm.io/gorm"
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)
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// 事务参与者的服务地址
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const SagaBarrierBusiApi = "/api/busi_saga_barrier"
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var SagaBarrierBusi = fmt.Sprintf("http://localhost:%d%s", SagaBarrierBusiPort, SagaBarrierBusiApi)
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func SagaBarrierMainStart() {
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SagaBarrierStartSvr()
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SagaBarrierFireRequest()
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}
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func SagaBarrierStartSvr() {
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logrus.Printf("saga barrier examples starting")
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app := common.GetGinApp()
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SagaBarrierAddRoute(app)
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go app.Run(fmt.Sprintf(":%d", SagaBarrierBusiPort))
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time.Sleep(100 * time.Millisecond)
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}
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func SagaBarrierFireRequest() {
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logrus.Printf("a busi transaction begin")
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req := &TransReq{Amount: 30}
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saga := dtmcli.NewSaga(DtmServer).
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Add(SagaBarrierBusi+"/TransOut", SagaBarrierBusi+"/TransOutCompensate", req).
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Add(SagaBarrierBusi+"/TransIn", SagaBarrierBusi+"/TransInCompensate", req)
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logrus.Printf("busi trans submit")
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err := saga.Submit()
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e2p(err)
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}
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// api
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func SagaBarrierAddRoute(app *gin.Engine) {
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app.POST(SagaBarrierBusiApi+"/TransIn", common.WrapHandler(sagaBarrierTransIn))
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app.POST(SagaBarrierBusiApi+"/TransInCompensate", common.WrapHandler(sagaBarrierTransInCompensate))
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app.POST(SagaBarrierBusiApi+"/TransOut", common.WrapHandler(sagaBarrierTransOut))
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app.POST(SagaBarrierBusiApi+"/TransOutCompensate", common.WrapHandler(sagaBarrierTransOutCompensate))
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logrus.Printf("examples listening at %d", SagaBarrierBusiPort)
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}
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func sagaBarrierTransIn(c *gin.Context) (interface{}, error) {
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req := reqFrom(c)
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return dtmcli.ThroughBarrierCall(dbGet().ToSqlDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
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db := common.SqlDB2DB(sdb)
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dbr := db.Model(&UserAccount{}).Where("user_id = ?", 1).
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Update("balance", gorm.Expr("balance + ?", req.Amount))
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return "SUCCESS", dbr.Error
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})
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}
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func sagaBarrierTransInCompensate(c *gin.Context) (interface{}, error) {
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req := reqFrom(c)
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return dtmcli.ThroughBarrierCall(dbGet().ToSqlDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
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db := common.SqlDB2DB(sdb)
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dbr := db.Model(&UserAccount{}).Where("user_id = ?", 1).
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Update("balance", gorm.Expr("balance - ?", req.Amount))
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return "SUCCESS", dbr.Error
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})
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}
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func sagaBarrierTransOut(c *gin.Context) (interface{}, error) {
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req := reqFrom(c)
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return dtmcli.ThroughBarrierCall(dbGet().ToSqlDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
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db := common.SqlDB2DB(sdb)
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dbr := db.Model(&UserAccount{}).Where("user_id = ?", 2).
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Update("balance", gorm.Expr("balance - ?", req.Amount))
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return "SUCCESS", dbr.Error
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})
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}
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func sagaBarrierTransOutCompensate(c *gin.Context) (interface{}, error) {
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req := reqFrom(c)
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return dtmcli.ThroughBarrierCall(dbGet().ToSqlDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
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db := common.SqlDB2DB(sdb)
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dbr := db.Model(&UserAccount{}).Where("user_id = ?", 2).
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Update("balance", gorm.Expr("balance + ?", req.Amount))
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return "SUCCESS", dbr.Error
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})
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}
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