frostfs-api-go/container/attributes.go

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package container
// SysAttributePrefix is a prefix of key to system attribute.
const SysAttributePrefix = "__NEOFS__"
const (
// SysAttributeSubnet is a string ID of container's storage subnet.
SysAttributeSubnet = SysAttributePrefix + "SUBNET"
// SysAttributeName is a string of human-friendly container name registered as the domain in NNS contract.
SysAttributeName = SysAttributePrefix + "NAME"
// SysAttributeZone is a string of zone for container name.
SysAttributeZone = SysAttributePrefix + "ZONE"
// SysAttributeHomomorphicHashing is a container's homomorphic hashing state.
SysAttributeHomomorphicHashing = SysAttributePrefix + "DISABLE_HOMOMORPHIC_HASHING"
)
// SysAttributeZoneDefault is a default value for SysAttributeZone attribute.
const SysAttributeZoneDefault = "container"
const disabledHomomorphicHashingValue = "true"
// HomomorphicHashingState returns container's homomorphic
// hashing state:
// * true if hashing is enabled;
// * false if hashing is disabled.
//
// All container's attributes must be unique, otherwise behavior
// is undefined.
//
// See also SetHomomorphicHashingState.
func (c Container) HomomorphicHashingState() bool {
for i := range c.attr {
if c.attr[i].GetKey() == SysAttributeHomomorphicHashing {
return c.attr[i].GetValue() != disabledHomomorphicHashingValue
}
}
return true
}
// SetHomomorphicHashingState sets homomorphic hashing state for
// container.
//
// All container's attributes must be unique, otherwise behavior
// is undefined.
//
// See also HomomorphicHashingState.
func (c *Container) SetHomomorphicHashingState(enable bool) {
for i := range c.attr {
if c.attr[i].GetKey() == SysAttributeHomomorphicHashing {
if enable {
// approach without allocation/waste
// coping works since the attributes
// order is not important
c.attr[i] = c.attr[len(c.attr)-1]
c.attr = c.attr[:len(c.attr)-1]
} else {
c.attr[i].SetValue(disabledHomomorphicHashingValue)
}
return
}
}
if !enable {
attr := Attribute{}
attr.SetKey(SysAttributeHomomorphicHashing)
attr.SetValue(disabledHomomorphicHashingValue)
c.attr = append(c.attr, attr)
}
}