mirror of https://github.com/k3s-io/k3s
77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package topologycache
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import (
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discovery "k8s.io/api/discovery/v1"
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)
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// SliceInfo stores information about EndpointSlices for the reconciliation
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// process.
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type SliceInfo struct {
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ServiceKey string
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AddressType discovery.AddressType
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ToCreate []*discovery.EndpointSlice
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ToUpdate []*discovery.EndpointSlice
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Unchanged []*discovery.EndpointSlice
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}
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func (si *SliceInfo) getTotalEndpoints() int {
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totalEndpoints := 0
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for _, slice := range si.ToCreate {
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totalEndpoints += len(slice.Endpoints)
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}
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for _, slice := range si.ToUpdate {
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totalEndpoints += len(slice.Endpoints)
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}
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for _, slice := range si.Unchanged {
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totalEndpoints += len(slice.Endpoints)
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}
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return totalEndpoints
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}
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// getAllocatedHintsByZone sums up the allocated hints we currently have in
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// unchanged slices and marks slices for update as necessary. A slice needs to
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// be updated if any of the following are true:
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// - It has an endpoint without zone hints
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// - It has an endpoint hint for a zone that no longer needs any
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// - It has endpoint hints that would make the minimum allocations necessary
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// impossible with changes to slices that are already being updated or
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// created.
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func (si *SliceInfo) getAllocatedHintsByZone(allocations map[string]Allocation) EndpointZoneInfo {
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allocatedHintsByZone := EndpointZoneInfo{}
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// Using filtering in place to remove any endpoints that are no longer
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// unchanged (https://github.com/golang/go/wiki/SliceTricks#filter-in-place)
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j := 0
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for _, slice := range si.Unchanged {
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hintsByZone := getHintsByZone(slice, allocatedHintsByZone, allocations)
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if hintsByZone == nil {
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si.ToUpdate = append(si.ToUpdate, slice.DeepCopy())
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} else {
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si.Unchanged[j] = slice
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j++
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for zone, numHints := range hintsByZone {
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allocatedHintsByZone[zone] += numHints
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}
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}
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}
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si.Unchanged = si.Unchanged[:j]
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return allocatedHintsByZone
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}
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