forked from TrueCloudLab/frostfs-node
63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
package node
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// Status represents a node
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// status bits.
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type Status uint64
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const leftBitPos = 64
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const (
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bitFullStorage = 1
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)
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// returns true if n-th left bit is set (starting at 0).
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func isLeftBitSet(value Status, n uint8) bool {
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bitMask := Status(1 << (leftBitPos - n))
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return bitMask != 0 && value&bitMask == bitMask
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}
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// sets n-th left bit (starting at 0).
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func setLeftBit(value *Status, n uint8) {
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*value |= Status(1 << (leftBitPos - n))
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}
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// resets n-th left bit (starting at 0).
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func resetLeftBit(value *Status, n uint8) {
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*value &= ^Status(1 << (leftBitPos - n))
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}
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// Full returns true if node is in Full status.
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//
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// Full status marks node has enough space
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// for storing users objects.
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func (n Status) Full() bool {
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return isLeftBitSet(n, bitFullStorage)
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}
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// SetFull sets Full status of node.
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func (n *Status) SetFull() {
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setLeftBit(n, bitFullStorage)
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}
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// ResetFull resets Full status of node.
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func (n *Status) ResetFull() {
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resetLeftBit(n, bitFullStorage)
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}
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// StatusFromUint64 converts builtin
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// uint64 value to Status.
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//
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// Try to avoid direct cast for
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// better portability.
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func StatusFromUint64(v uint64) Status {
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return Status(v)
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}
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// StatusToUint64 converts Status value
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// to builtin uint64.
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//
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// Try to avoid direct cast for
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// better portability.
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func StatusToUint64(s Status) uint64 {
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return uint64(s)
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}
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