frostfs-node/pkg/local_object_storage/shard/mode/mode.go

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package mode
import "math"
// Mode represents enumeration of Shard work modes.
type Mode uint32
const (
// ReadWrite is a Mode value for shard that is available
// for read and write operations. Default shard mode.
ReadWrite Mode = 0b000
// ReadOnly is a Mode value for shard that does not
// accept write operation but is readable.
ReadOnly Mode = 0b001
// Degraded is a Mode value for shard when the metabase is unavailable.
// It is hard to perform some modifying operations in this mode, thus it can only be set by an administrator.
Degraded Mode = 0b010
// Disabled mode is a mode where a shard is disabled.
// An existing shard can't have this mode, but it can be used in
// the configuration or control service commands.
Disabled Mode = math.MaxUint32
// DegradedReadOnly is a Mode value for shard that is set automatically
// after a certain number of errors is encountered. It is the same as
// `mode.Degraded` but also is read-only.
DegradedReadOnly Mode = Degraded | ReadOnly
)
func (m Mode) String() string {
switch m {
default:
return "UNDEFINED"
case ReadWrite:
return "READ_WRITE"
case ReadOnly:
return "READ_ONLY"
case Degraded:
return "DEGRADED_READ_WRITE"
case DegradedReadOnly:
return "DEGRADED_READ_ONLY"
case Disabled:
return "DISABLED"
}
}
// NoMetabase returns true iff m is operating without the metabase.
func (m Mode) NoMetabase() bool {
return m&Degraded != 0
}
// ReadOnly returns true iff m prohibits modifying operations with shard.
func (m Mode) ReadOnly() bool {
return m&ReadOnly != 0
}
func (m Mode) Disabled() bool {
return m == Disabled
}