frostfs-api-go-pogpp/pkg/netmap/node_info.go

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package netmap
import (
"strconv"
"github.com/nspcc-dev/hrw"
"github.com/nspcc-dev/neofs-api-go/v2/netmap"
)
type (
// Node is a wrapper over NodeInfo.
Node struct {
ID uint64
Index int
Capacity uint64
Price uint64
AttrMap map[string]string
InfoV2 *netmap.NodeInfo
}
// Nodes represents slice of graph leafs.
Nodes []*Node
)
// Enumeration of well-known attributes.
const (
CapacityAttr = "Capacity"
PriceAttr = "Price"
)
var _ hrw.Hasher = (*Node)(nil)
// Hash is a function from hrw.Hasher interface. It is implemented
// to support weighted hrw therefore sort function sorts nodes
// based on their `N` value.
func (n Node) Hash() uint64 {
return n.ID
}
// NetworkAddress returns network address
// of the node in a string format.
func (n Node) NetworkAddress() string {
return n.InfoV2.GetAddress()
}
// PublicKey returns public key of the node in bytes.
func (n Node) PublicKey() []byte {
return n.InfoV2.GetPublicKey()
}
// NodesFromV2 converts slice of v2 netmap.NodeInfo to a generic node slice.
func NodesFromV2(infos []netmap.NodeInfo) Nodes {
nodes := make(Nodes, len(infos))
for i := range infos {
nodes[i] = newNodeV2(i, &infos[i])
}
return nodes
}
func newNodeV2(index int, ni *netmap.NodeInfo) *Node {
n := &Node{
ID: hrw.Hash(ni.GetPublicKey()),
Index: index,
AttrMap: make(map[string]string, len(ni.GetAttributes())),
InfoV2: ni,
}
for _, attr := range ni.GetAttributes() {
switch attr.GetKey() {
case CapacityAttr:
n.Capacity, _ = strconv.ParseUint(attr.GetValue(), 10, 64)
case PriceAttr:
n.Price, _ = strconv.ParseUint(attr.GetValue(), 10, 64)
}
n.AttrMap[attr.GetKey()] = attr.GetValue()
}
return n
}
// Weights returns slice of nodes weights W.
func (n Nodes) Weights(wf weightFunc) []float64 {
w := make([]float64, 0, len(n))
for i := range n {
w = append(w, wf(n[i]))
}
return w
}
// Attribute returns value of attribute k.
func (n *Node) Attribute(k string) string {
return n.AttrMap[k]
}
// GetBucketWeight computes weight for a Bucket.
func GetBucketWeight(ns Nodes, a aggregator, wf weightFunc) float64 {
for i := range ns {
a.Add(wf(ns[i]))
}
return a.Compute()
}