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

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package mode
// Mode represents enumeration of Shard work modes.
type Mode uint32
// ReadWrite is a Mode value for shard that is available
// for read and write operations. Default shard mode.
const ReadWrite Mode = 0
const (
// ReadOnly is a Mode value for shard that does not
// accept write operation but is readable.
ReadOnly Mode = 1 << iota
// Degraded is a Mode value for shard that is set automatically
// after a certain number of errors is encountered. It is the same as
// `mode.ReadOnly` but also enables fallback algorithms for getting object
// in case metabase is corrupted.
Degraded
)
func (m Mode) String() string {
switch m {
default:
return "UNDEFINED"
case ReadWrite:
return "READ_WRITE"
case ReadOnly:
return "READ_ONLY"
case Degraded:
return "DEGRADED"
}
}
// 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
}