forked from TrueCloudLab/frostfs-sdk-go
149 lines
3.7 KiB
Go
149 lines
3.7 KiB
Go
package netmap
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import (
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"fmt"
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"github.com/nspcc-dev/hrw"
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"github.com/nspcc-dev/neofs-api-go/v2/netmap"
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)
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// NetMap represents NeoFS network map. It includes information about all
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// storage nodes registered in NeoFS the network.
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type NetMap struct {
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nodes []NodeInfo
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}
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// SetNodes sets information list about all storage nodes from the NeoFS network.
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//
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// Argument MUST NOT be mutated, make a copy first.
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//
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// See also Nodes.
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func (m *NetMap) SetNodes(nodes []NodeInfo) {
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m.nodes = nodes
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}
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// Nodes returns nodes set using SetNodes.
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//
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// Return value MUST not be mutated, make a copy first.
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func (m NetMap) Nodes() []NodeInfo {
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return m.nodes
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}
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// nodes is a slice of NodeInfo instances needed for HRW sorting.
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type nodes []NodeInfo
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// assert nodes type provides hrw.Hasher required for HRW sorting.
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var _ hrw.Hasher = nodes{}
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// Hash is a function from hrw.Hasher interface. It is implemented
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// to support weighted hrw sorting of buckets. Each bucket is already sorted by hrw,
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// thus giving us needed "randomness".
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func (n nodes) Hash() uint64 {
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if len(n) > 0 {
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return n[0].Hash()
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}
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return 0
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}
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// weights returns slice of nodes weights W.
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func (n nodes) weights(wf weightFunc) []float64 {
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w := make([]float64, 0, len(n))
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for i := range n {
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w = append(w, wf(n[i]))
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}
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return w
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}
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func flattenNodes(ns []nodes) nodes {
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var sz, i int
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for i = range ns {
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sz += len(ns[i])
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}
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result := make(nodes, 0, sz)
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for i := range ns {
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result = append(result, ns[i]...)
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}
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return result
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}
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// PlacementVectors sorts container nodes returned by ContainerNodes method
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// and returns placement vectors for the entity identified by the given pivot.
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// For example, in order to build node list to store the object, binary-encoded
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// object identifier can be used as pivot. Result is deterministic for
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// the fixed NetMap and parameters.
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func (m NetMap) PlacementVectors(vectors [][]NodeInfo, pivot []byte) ([][]NodeInfo, error) {
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h := hrw.Hash(pivot)
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wf := defaultWeightFunc(m.nodes)
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result := make([][]NodeInfo, len(vectors))
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for i := range vectors {
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result[i] = make([]NodeInfo, len(vectors[i]))
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copy(result[i], vectors[i])
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hrw.SortSliceByWeightValue(result[i], nodes(result[i]).weights(wf), h)
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}
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return result, nil
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}
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// ContainerNodes returns two-dimensional list of nodes as a result of applying
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// given PlacementPolicy to the NetMap. Each line of the list corresponds to a
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// replica descriptor. Line order corresponds to order of ReplicaDescriptor list
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// in the policy. Nodes are pre-filtered according to the Filter list from
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// the policy, and then selected by Selector list. Result is deterministic for
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// the fixed NetMap and parameters.
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//
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// Result can be used in PlacementVectors.
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func (m NetMap) ContainerNodes(p PlacementPolicy, pivot []byte) ([][]NodeInfo, error) {
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c := newContext(m)
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c.setPivot(pivot)
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c.setCBF(p.backupFactor)
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if err := c.processFilters(p); err != nil {
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return nil, err
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}
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if err := c.processSelectors(p); err != nil {
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return nil, err
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}
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result := make([][]NodeInfo, len(p.replicas))
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for i := range p.replicas {
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sName := p.replicas[i].GetSelector()
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if sName == "" {
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if len(p.selectors) == 0 {
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var s netmap.Selector
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s.SetCount(p.replicas[i].GetCount())
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s.SetFilter(mainFilterName)
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nodes, err := c.getSelection(p, s)
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if err != nil {
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return nil, err
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}
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result[i] = flattenNodes(nodes)
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}
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for i := range p.selectors {
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result[i] = append(result[i], flattenNodes(c.selections[p.selectors[i].GetName()])...)
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}
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continue
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}
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nodes, ok := c.selections[sName]
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if !ok {
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return nil, fmt.Errorf("selector not found: REPLICA '%s'", sName)
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}
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result[i] = append(result[i], flattenNodes(nodes)...)
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}
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return result, nil
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}
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