frostfs-node/pkg/services/container/announcement/load/route/placement/calls.go

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package placementrouter
import (
"bytes"
"fmt"
netmapcore "github.com/TrueCloudLab/frostfs-node/pkg/core/netmap"
loadroute "github.com/TrueCloudLab/frostfs-node/pkg/services/container/announcement/load/route"
"github.com/TrueCloudLab/frostfs-sdk-go/container"
)
// NextStage composes container nodes for the container and epoch from a,
// and returns the list of nodes with maximum weight (one from each vector).
//
// If passed route has more than one point, then endpoint of the route is reached.
//
// The traversed route is not checked, it is assumed to be correct.
func (b *Builder) NextStage(a container.SizeEstimation, passed []loadroute.ServerInfo) ([]loadroute.ServerInfo, error) {
if len(passed) > 1 {
return nil, nil
}
cnr := a.Container()
placement, err := b.placementBuilder.BuildPlacement(a.Epoch(), cnr)
if err != nil {
return nil, fmt.Errorf("could not build placement %s: %w", cnr, err)
}
res := make([]loadroute.ServerInfo, 0, len(placement))
for i := range placement {
if len(placement[i]) == 0 {
continue
}
if len(passed) == 1 && bytes.Equal(passed[0].PublicKey(), placement[i][0].PublicKey()) {
// add nil element so the announcement will be saved in local memory
res = append(res, nil)
} else {
// add element with remote node to send announcement to
res = append(res, netmapcore.Node(placement[i][0]))
}
}
return res, nil
}