dtm-labs/dtmcli-go-sample

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dtmcli-go-sample

Minimal usage example for dtmcli

Quick start

Installing and running dtm

Refer to dtm installation and running

Startup example

go run main.go

Output

The order of execution can be seen in the log of dtmcli-go-sample as follows.

• TransOut
• TransIn

The entire saga transaction was executed successfully

Example interpretation

  // Business-specific microservice address
  const qsBusi = "http://localhost:8081/api/busi_saga"
  req := &gin.H{"amount": 30} // load of the microservice
  // DtmServer is the address of the DTM service and is a url
  DtmServer := "http://localhost:36789/api/dtmsvr"
  saga := dtmcli.NewSaga(DtmServer, dtmcli.MustGenGid(DtmServer)).
    // Add a subtransaction of TransOut, the forward action is url: qsBusi+"/TransOut" and the compensating action is url: qsBusi+"/TransOutCom"
    Add(qsBusi+"/TransOut", qsBusi+"/TransOutCom", req).
    // Add a subtransaction of TransIn, with url: qsBusi+"/TransIn" for the forward operation and url: qsBusi+"/TransInCom" for the compensating operation
    Add(qsBusi+"/TransIn", qsBusi+"/TransInCom", req)
  // commit saga transaction, dtm will complete all subtransactions/rollback all subtransactions
  err := saga.Submit()

For more examples, see dtm-examples