[#399] container: Support homomorphic hash disabling

Container could now have "__NEOFS__DISABLE_HOMOMORPHIC_HASHING" well-known
attribute. Setting that to "true" means disabling homomorphic hashing for
objects that belong to that container, any other cases mean that homomorphic
hashing is enabled.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
This commit is contained in:
Pavel Karpy 2022-05-04 20:11:22 +03:00 committed by LeL
parent 417fd3a08b
commit c6f7ab3ef1
2 changed files with 116 additions and 0 deletions

View file

@ -12,7 +12,64 @@ const (
// 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)
}
}

View file

@ -0,0 +1,59 @@
package container_test
import (
"testing"
"github.com/nspcc-dev/neofs-api-go/v2/container"
containertest "github.com/nspcc-dev/neofs-api-go/v2/container/test"
"github.com/stretchr/testify/require"
)
func TestContainer_HomomorphicHashingDisabled(t *testing.T) {
cnr := containertest.GenerateContainer(false)
t.Run("defaults", func(t *testing.T) {
require.True(t, cnr.HomomorphicHashingState())
})
t.Run("disabled", func(t *testing.T) {
attr := container.Attribute{}
attr.SetKey(container.SysAttributeHomomorphicHashing)
attr.SetValue("NOT_true")
cnr.SetAttributes(append(cnr.GetAttributes(), attr))
require.True(t, cnr.HomomorphicHashingState())
attr.SetValue("true")
cnr.SetAttributes([]container.Attribute{attr})
require.False(t, cnr.HomomorphicHashingState())
})
}
func TestContainer_SetHomomorphicHashingState(t *testing.T) {
cnr := containertest.GenerateContainer(false)
attrs := cnr.GetAttributes()
attrLen := len(attrs)
cnr.SetHomomorphicHashingState(true)
// enabling hashing should not add any new attributes
require.Equal(t, attrLen, len(cnr.GetAttributes()))
require.True(t, cnr.HomomorphicHashingState())
cnr.SetHomomorphicHashingState(false)
// disabling hashing should add exactly one attribute
require.Equal(t, attrLen+1, len(cnr.GetAttributes()))
require.False(t, cnr.HomomorphicHashingState())
cnr.SetHomomorphicHashingState(true)
// enabling hashing should remove 1 attribute if
// hashing was disabled before
require.Equal(t, attrLen, len(cnr.GetAttributes()))
require.True(t, cnr.HomomorphicHashingState())
// hashing operations should not change any other attributes
require.ElementsMatch(t, attrs, cnr.GetAttributes())
}