fencing

package

v0.4.0 Latest Latest Go to latest Published: Sep 2, 2026 License: MIT Imports: 7 Imported by: 0

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Package fencing defines resource leases that issue fencing tokens.

This section is empty.

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var (
	ErrLeaseHeld  = errors.New("fencing resource lease is held")
	ErrStaleGrant = errors.New("stale fencing grant")
)

func IsSerializationFailure(err error) bool

IsSerializationFailure reports the PostgreSQL retry class without coupling callers to one concrete driver error type.

type Guarantee string

Guarantee states the persistence guarantee of a provider.

const (
	GuaranteeLocalAdvisory    Guarantee = "local_advisory"
	GuaranteeDurableMonotonic Guarantee = "durable_monotonic"
)

type InMemoryProvider struct {
	// contains filtered or unexported fields
}

InMemoryProvider provides local advisory serialization only.

func NewInMemoryProvider() *InMemoryProvider

func (provider *InMemoryProvider) Acquire(ctx context.Context, request Request) (Lease, error)

func (*InMemoryProvider) Guarantee() Guarantee

type Lease interface {
	Grant() invocation.FencingGrant
	Renew(context.Context, time.Duration) error
	Release(context.Context) error
}

Lease is one acquired grant.

type PostgresProvider struct {
	// contains filtered or unexported fields
}

PostgresProvider issues durable monotonic tokens from V2 migration tables.

func NewPostgresProvider(db *sql.DB) (*PostgresProvider, error)

func (provider *PostgresProvider) Acquire(ctx context.Context, request Request) (Lease, error)

func (*PostgresProvider) Guarantee() Guarantee

type Provider interface {
	Guarantee() Guarantee
	Acquire(context.Context, Request) (Lease, error)
}

Provider issues grants and reports their persistence guarantee.

type Request struct {
	Authority string
	Resource  string
	Holder    string
	TTL       time.Duration
}

Request identifies one resource lease.