70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
package examples
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import (
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"github.com/gin-gonic/gin"
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"github.com/yedf/dtm/common"
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"github.com/yedf/dtm/dtmcli"
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)
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func init() {
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setupFuncs["SagaBarrierSetup"] = func(app *gin.Engine) {
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app.POST(BusiAPI+"/SagaBTransIn", common.WrapHandler(sagaBarrierTransIn))
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app.POST(BusiAPI+"/SagaBTransInCompensate", common.WrapHandler(sagaBarrierTransInCompensate))
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app.POST(BusiAPI+"/SagaBTransOut", common.WrapHandler(sagaBarrierTransOut))
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app.POST(BusiAPI+"/SagaBTransOutCompensate", common.WrapHandler(sagaBarrierTransOutCompensate))
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}
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addSample("saga_barrier", func() string {
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dtmcli.Logf("a busi transaction begin")
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req := &TransReq{Amount: 30}
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saga := dtmcli.NewSaga(DtmServer, dtmcli.MustGenGid(DtmServer)).
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Add(Busi+"/SagaBTransOut", Busi+"/SagaBTransOutCompensate", req).
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Add(Busi+"/SagaBTransIn", Busi+"/SagaBTransInCompensate", req)
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dtmcli.Logf("busi trans submit")
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err := saga.Submit()
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dtmcli.FatalIfError(err)
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return saga.Gid
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})
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}
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func sagaBarrierAdjustBalance(db dtmcli.DB, uid int, amount int) error {
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_, err := dtmcli.DBExec(db, "update dtm_busi.user_account set balance = balance + ? where user_id = ?", amount, uid)
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return err
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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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if req.TransInResult != "" {
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return req.TransInResult, nil
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}
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barrier := MustBarrierFromGin(c)
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return dtmcli.ResultSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
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return sagaBarrierAdjustBalance(db, 1, req.Amount)
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})
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}
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func sagaBarrierTransInCompensate(c *gin.Context) (interface{}, error) {
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barrier := MustBarrierFromGin(c)
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return dtmcli.ResultSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
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return sagaBarrierAdjustBalance(db, 1, -reqFrom(c).Amount)
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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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if req.TransInResult != "" {
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return req.TransInResult, nil
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}
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barrier := MustBarrierFromGin(c)
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return dtmcli.ResultSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
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return sagaBarrierAdjustBalance(db, 2, -req.Amount)
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})
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}
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func sagaBarrierTransOutCompensate(c *gin.Context) (interface{}, error) {
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barrier := MustBarrierFromGin(c)
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return dtmcli.ResultSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
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return sagaBarrierAdjustBalance(db, 2, reqFrom(c).Amount)
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})
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}
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