83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
package dtmsvr
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import (
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"fmt"
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"strings"
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"github.com/yedf/dtm/common"
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)
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type TransTccProcessor struct {
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*TransGlobal
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}
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func init() {
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registorProcessorCreator("tcc", func(trans *TransGlobal) TransProcessor { return &TransTccProcessor{TransGlobal: trans} })
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}
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func (t *TransTccProcessor) GenBranches() []TransBranch {
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branches := []TransBranch{}
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steps := []M{}
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common.MustUnmarshalString(t.Data, &steps)
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for _, step := range steps {
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for _, branchType := range []string{"cancel", "confirm", "try"} {
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branches = append(branches, TransBranch{
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Gid: t.Gid,
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Branch: fmt.Sprintf("%d", len(branches)+1),
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Data: step["data"].(string),
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Url: step[branchType].(string),
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BranchType: branchType,
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Status: "prepared",
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})
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}
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}
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return branches
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}
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func (t *TransTccProcessor) ExecBranch(db *common.MyDb, branch *TransBranch) {
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resp, err := common.RestyClient.R().SetBody(branch.Data).SetQueryParam("gid", branch.Gid).Post(branch.Url)
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e2p(err)
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body := resp.String()
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t.touch(db)
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if strings.Contains(body, "SUCCESS") {
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branch.changeStatus(db, "succeed")
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} else if branch.BranchType == "try" && strings.Contains(body, "FAIL") {
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branch.changeStatus(db, "failed")
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} else {
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panic(fmt.Errorf("unknown response: %s, will be retried", body))
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}
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}
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func (t *TransTccProcessor) ProcessOnce(db *common.MyDb, branches []TransBranch) {
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t.MayQueryPrepared(db)
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if t.Status != "committed" {
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return
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}
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current := 0 // 当前正在处理的步骤
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// 先处理一轮正常try状态
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for ; current < len(branches); current++ {
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branch := &branches[current]
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if branch.BranchType != "try" || branch.Status == "succeed" {
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continue
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}
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if branch.BranchType == "try" && branch.Status == "prepared" {
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t.ExecBranch(db, branch)
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if branch.Status != "succeed" {
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break
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}
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} else {
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break
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}
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}
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// 如果try全部成功，则处理confirm分支，否则处理cancel分支
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currentType := common.If(current == len(branches), "confirm", "cancel")
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for current--; current >= 0; current-- {
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branch := &branches[current]
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if branch.BranchType != currentType || branch.Status != "prepared" {
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continue
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}
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t.ExecBranch(db, branch)
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}
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t.changeStatus(db, common.If(currentType == "confirm", "succeed", "failed").(string))
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}
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