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!feat(dtc):renamed Context and added DTC (#45)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package sqle | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql" | ||
| ) | ||
|
|
||
| // DTC Distributed Transaction Coordinator | ||
| type DTC struct { | ||
| ctx context.Context | ||
| opts *sql.TxOptions | ||
|
|
||
| sessions []*session | ||
| } | ||
|
|
||
| // session represents a transaction session. | ||
| type session struct { | ||
| committed bool | ||
| client *Client | ||
| tx *Tx | ||
| exec []func(context.Context, Connector) error | ||
| revert []func(context.Context, Connector) error | ||
| } | ||
|
|
||
| // NewDTC creates a new instance of DTC. | ||
| func NewDTC(ctx context.Context, opts *sql.TxOptions) *DTC { | ||
| return &DTC{ | ||
| ctx: ctx, | ||
| opts: opts, | ||
| } | ||
| } | ||
|
|
||
| // Prepare adds a new transaction session to the DTC. | ||
| func (d *DTC) Prepare(client *Client, exec func(ctx context.Context, conn Connector) error, revert func(ctx context.Context, conn Connector) error) { | ||
| for _, s := range d.sessions { | ||
| if s.client == client { | ||
| s.exec = append(s.exec, exec) | ||
| s.revert = append(s.revert, revert) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| s := &session{ | ||
| committed: false, | ||
| client: client, | ||
| exec: []func(ctx context.Context, c Connector) error{ | ||
| exec, | ||
| }, | ||
| revert: []func(ctx context.Context, c Connector) error{ | ||
| revert, | ||
| }, | ||
| } | ||
|
|
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| d.sessions = append(d.sessions, s) | ||
|
|
||
| } | ||
|
|
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| // Commit commits all the prepared transactions in the DTC. | ||
| func (d *DTC) Commit() error { | ||
| for _, s := range d.sessions { | ||
| tx, err := s.client.BeginTx(d.ctx, d.opts) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| s.tx = tx | ||
|
|
||
| for _, exec := range s.exec { | ||
| err = exec(d.ctx, tx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| for _, s := range d.sessions { | ||
| err := s.tx.Commit() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| s.committed = true | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Rollback rolls back all the prepared transactions in the DTC. | ||
| func (d *DTC) Rollback() []error { | ||
| var errs []error | ||
|
|
||
| for _, s := range d.sessions { | ||
| if s.committed { | ||
| for _, revert := range s.revert { | ||
| if err := revert(d.ctx, s.client); err != nil { | ||
| errs = append(errs, err) | ||
| } | ||
| } | ||
|
|
||
| } else { | ||
| if err := s.tx.Rollback(); err != nil { | ||
| errs = append(errs, err) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return errs | ||
| } |
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