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[#356] netmap: Improve docs and slightly optimize the code

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API changes:
  * Rename `Enters` method of the `NodeSubnetInfo` to `Enabled`.
  * Declare undefined behavior of `WriteSubnetInfo` with non-unique
  attributes.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
This commit is contained in:
Leonard Lyubich 2021-11-23 13:48:37 +03:00 committed by LeL
parent abc494b2bc
commit 50ab22c19c
1 changed files with 9 additions and 6 deletions
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15
netmap/attributes.go
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@ -28,8 +28,8 @@ type NodeSubnetInfo struct {
id *refs.SubnetID
}
// Enters returns true iff node enters the subnet.
func (x NodeSubnetInfo) Enters() bool {
// Enabled returns true iff subnet membership is enabled for the node.
func (x NodeSubnetInfo) Enabled() bool {
return !x.exit
}
@ -56,9 +56,11 @@ func subnetAttributeKey(id *refs.SubnetID) string {
// WriteSubnetInfo writes NodeSubnetInfo to NodeInfo via attributes. NodeInfo must not be nil.
//
// Existing subnet attributes are expected to be key-unique, otherwise undefined behavior.
//
// Does not add (removes existing) attribute if node:
// * exists non-zero subnet;
// * enters zero subnet.
// * disables non-zero subnet;
// * enables zero subnet.
//
// Attribute key is calculated from ID using format `__NEOFS__SUBNET_%s`.
// Attribute Value is:
@ -68,7 +70,7 @@ func WriteSubnetInfo(node *NodeInfo, info NodeSubnetInfo) {
attrs := node.GetAttributes()
id := info.ID()
enters := info.Enters()
enters := info.Enabled()
// calculate attribute key
key := subnetAttributeKey(id)
@ -77,6 +79,7 @@ func WriteSubnetInfo(node *NodeInfo, info NodeSubnetInfo) {
for i := range attrs {
if attrs[i].GetKey() == key {
attrs = append(attrs[:i], attrs[i+1:]...)
break // attributes are expected to be key-unique
}
}
} else {
@ -141,7 +144,7 @@ func IterateSubnets(node *NodeInfo, f func(refs.SubnetID) error) error {
// cut subnet ID string
idTxt := strings.TrimPrefix(key, attrSubnetPrefix)
if idTxt == key {
if len(idTxt) == len(key) {
// not a subnet attribute
continue
}