890022ae64
This commit ensures that the compiler has to check every component against the groups they implement by explicitly annotating the appropriate interfaces.
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
package locker
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import (
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"context"
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"github.com/FAU-CDI/wisski-distillery/internal/models"
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"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient"
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"github.com/tkw1536/goprogram/exit"
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)
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// Locker provides facitilites for locking this WissKI instance
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type Locker struct {
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ingredient.Base
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}
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var (
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_ = (ingredient.WissKIFetcher)((*Locker)(nil))
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)
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var Locked = exit.Error{
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Message: "WissKI Instance is locked for administrative operations",
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ExitCode: exit.ExitGeneric,
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}
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// TryLock attemps to lock this WissKI and returns if it suceeded
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func (lock *Locker) TryLock(ctx context.Context) bool {
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table, err := lock.Malt.SQL.QueryTable(ctx, true, models.LockTable)
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if err != nil {
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return false
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}
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result := table.FirstOrCreate(&models.Lock{}, models.Lock{Slug: lock.Slug})
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return result.Error == nil && result.RowsAffected == 1
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}
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// TryUnlock attempts to unlock this WissKI and reports if it succeeded.
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// An unlock can only
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func (lock *Locker) TryUnlock(ctx context.Context) bool {
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table, err := lock.Malt.SQL.QueryTable(ctx, true, models.LockTable)
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if err != nil {
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return false
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}
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result := table.Where("slug = ?", lock.Slug).Delete(&models.Lock{})
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return result.Error == nil && result.RowsAffected == 1
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}
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// Unlock unlocks this WissKI, ignoring any error.
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func (lock *Locker) Unlock(ctx context.Context) {
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lock.TryUnlock(ctx)
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}
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