100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package dtmcli
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import (
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"errors"
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"fmt"
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"net/url"
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)
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// M a short name
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type M = map[string]interface{}
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// MS a short name
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type MS = map[string]string
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// MustGenGid generate a new gid
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func MustGenGid(server string) string {
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res := MS{}
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resp, err := RestyClient.R().SetResult(&res).Get(server + "/newGid")
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if err != nil || res["gid"] == "" {
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panic(fmt.Errorf("newGid error: %v, resp: %s", err, resp))
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}
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return res["gid"]
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}
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// IDGenerator used to generate a branch id
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type IDGenerator struct {
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parentID string
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branchID int
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}
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// NewBranchID generate a branch id
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func (g *IDGenerator) NewBranchID() string {
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if g.branchID >= 99 {
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panic(fmt.Errorf("branch id is larger than 99"))
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}
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if len(g.parentID) >= 20 {
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panic(fmt.Errorf("total branch id is longer than 20"))
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}
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g.branchID = g.branchID + 1
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return g.parentID + fmt.Sprintf("%02d", g.branchID)
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}
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// TransResult dtm 返回的结果
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type TransResult struct {
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DtmResult string `json:"dtm_result"`
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Message string
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}
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// TransData 每个全局事务都有的数据
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type TransData struct {
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Gid string `json:"gid"`
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TransType string `json:"trans_type"`
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}
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// TransBase 事务的基础类
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type TransBase struct {
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IDGenerator
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Dtm string
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// WaitResult 是否等待全局事务的最终结果
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WaitResult bool
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}
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// TransBaseFromQuery construct transaction info from request
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func TransBaseFromQuery(qs url.Values) *TransBase {
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return &TransBase{
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IDGenerator: IDGenerator{parentID: qs.Get("branch_id")},
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Dtm: qs.Get("dtm"),
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}
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}
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// CallDtm 调用dtm服务器，返回事务的状态
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func (tb *TransBase) CallDtm(body interface{}, operation string) error {
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params := MS{}
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if tb.WaitResult {
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params["wait_result"] = "1"
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}
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resp, err := RestyClient.R().SetQueryParams(params).
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SetResult(&TransResult{}).SetBody(body).Post(fmt.Sprintf("%s/%s", tb.Dtm, operation))
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if err != nil {
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return err
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}
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tr := resp.Result().(*TransResult)
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if tr.DtmResult == "FAILURE" {
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return errors.New("FAILURE: " + tr.Message)
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}
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return nil
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}
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// ErrFailure 表示返回失败，要求回滚
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var ErrFailure = errors.New("transaction FAILURE")
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// ErrPending 表示暂时失败，要求重试
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var ErrPending = errors.New("transaction PENDING")
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// ResultSuccess 表示返回成功，可以进行下一步
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var ResultSuccess = M{"dtm_result": "SUCCESS"}
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// ResultFailure 表示返回失败，要求回滚
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var ResultFailure = M{"dtm_result": "FAILURE"}
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