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c71ccc8a80
* fix: improve context handling in projections * fix tests * use as of system time for current sequence * use as of system time for current sequence Co-authored-by: Silvan <silvan.reusser@gmail.com>
89 lines
2.6 KiB
Go
89 lines
2.6 KiB
Go
package crdb
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import (
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"context"
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"database/sql"
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"fmt"
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"time"
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"github.com/zitadel/logging"
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"github.com/zitadel/zitadel/internal/errors"
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"github.com/zitadel/zitadel/internal/id"
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)
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const (
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lockStmtFormat = "INSERT INTO %[1]s" +
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" (locker_id, locked_until, projection_name, instance_id) VALUES ($1, now()+$2::INTERVAL, $3, $4)" +
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" ON CONFLICT (projection_name, instance_id)" +
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" DO UPDATE SET locker_id = $1, locked_until = now()+$2::INTERVAL" +
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" WHERE %[1]s.projection_name = $3 AND %[1]s.instance_id = $4 AND (%[1]s.locker_id = $1 OR %[1]s.locked_until < now())"
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)
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type Locker interface {
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Lock(ctx context.Context, lockDuration time.Duration, instanceID string) <-chan error
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Unlock(instanceID string) error
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}
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type locker struct {
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client *sql.DB
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lockStmt string
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workerName string
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projectionName string
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}
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func NewLocker(client *sql.DB, lockTable, projectionName string) Locker {
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workerName, err := id.SonyFlakeGenerator.Next()
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logging.OnError(err).Panic("unable to generate lockID")
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return &locker{
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client: client,
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lockStmt: fmt.Sprintf(lockStmtFormat, lockTable),
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workerName: workerName,
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projectionName: projectionName,
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}
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}
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func (h *locker) Lock(ctx context.Context, lockDuration time.Duration, instanceID string) <-chan error {
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errs := make(chan error)
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go h.handleLock(ctx, errs, lockDuration, instanceID)
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return errs
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}
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func (h *locker) handleLock(ctx context.Context, errs chan error, lockDuration time.Duration, instanceID string) {
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renewLock := time.NewTimer(0)
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for {
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select {
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case <-renewLock.C:
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errs <- h.renewLock(ctx, lockDuration, instanceID)
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//refresh the lock 500ms before it times out. 500ms should be enough for one transaction
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renewLock.Reset(lockDuration - (500 * time.Millisecond))
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case <-ctx.Done():
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close(errs)
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renewLock.Stop()
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return
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}
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}
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}
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func (h *locker) renewLock(ctx context.Context, lockDuration time.Duration, instanceID string) error {
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//the unit of crdb interval is seconds (https://www.cockroachlabs.com/docs/stable/interval.html).
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res, err := h.client.ExecContext(ctx, h.lockStmt, h.workerName, lockDuration.Seconds(), h.projectionName, instanceID)
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if err != nil {
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return errors.ThrowInternal(err, "CRDB-uaDoR", "unable to execute lock")
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}
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if rows, _ := res.RowsAffected(); rows == 0 {
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return errors.ThrowAlreadyExists(nil, "CRDB-mmi4J", "projection already locked")
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}
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return nil
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}
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func (h *locker) Unlock(instanceID string) error {
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_, err := h.client.Exec(h.lockStmt, h.workerName, float64(0), h.projectionName, instanceID)
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if err != nil {
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return errors.ThrowUnknown(err, "CRDB-JjfwO", "unlock failed")
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}
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return nil
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}
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