mirror of
https://github.com/TECHNOFAB11/zfs-localpv.git
synced 2025-12-12 14:30:12 +01:00
130 lines
3.1 KiB
Go
130 lines
3.1 KiB
Go
/*
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Copyright © 2019 The OpenEBS 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 scheduler
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import (
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"sort"
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"github.com/container-storage-interface/spec/lib/go/csi"
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k8sapi "github.com/openebs/lib-csi/pkg/client/k8s"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/klog"
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)
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// key value struct for creating the filtered list
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type kv struct {
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Key string
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Value int64
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}
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// getNodeList gets the nodelist which satisfies the topology info
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func getNodeList(topo []*csi.Topology) ([]string, error) {
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var nodelist []string
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list, err := k8sapi.ListNodes(metav1.ListOptions{})
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if err != nil {
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return nil, err
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}
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for _, node := range list.Items {
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for _, prf := range topo {
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nodeFiltered := false
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for key, value := range prf.Segments {
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if node.Labels[key] != value {
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nodeFiltered = true
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break
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}
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}
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if !nodeFiltered {
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nodelist = append(nodelist, node.Name)
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break
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}
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}
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}
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return nodelist, nil
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}
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// runScheduler goes through the node mapping in the topology
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// and creates the list of preferred nodes as per their weight
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func runScheduler(nodelist []string, nmap map[string]int64) []string {
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var preferred []string
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var fmap []kv
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// go though the filtered node and prepare the preferred list
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for _, node := range nodelist {
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if val, ok := nmap[node]; ok {
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// create the filtered node map
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fmap = append(fmap, kv{node, val})
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} else {
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// put the non occupied nodes in beginning of the list
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preferred = append(preferred, node)
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}
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}
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// sort the filtered node map
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sort.Slice(fmap, func(i, j int) bool {
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return fmap[i].Value < fmap[j].Value
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})
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// put the occupied nodes in the sorted order at the end
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for _, kv := range fmap {
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preferred = append(preferred, kv.Key)
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}
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return preferred
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}
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// Scheduler schedules the PV as per topology constraints for
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// the given node weight.
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func Scheduler(req *csi.CreateVolumeRequest, nmap map[string]int64) []string {
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var nodelist []string
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areq := req.AccessibilityRequirements
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if areq == nil {
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klog.Errorf("scheduler: Accessibility Requirements not provided")
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return nodelist
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}
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topo := areq.Preferred
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if len(topo) == 0 {
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// if preferred list is empty, use the requisite
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topo = areq.Requisite
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}
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if len(topo) == 0 {
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klog.Errorf("scheduler: topology information not provided")
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return nodelist
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}
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nodelist, err := getNodeList(topo)
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if err != nil {
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klog.Errorf("scheduler: can not get the nodelist err : %v", err.Error())
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return nodelist
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} else if len(nodelist) == 0 {
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klog.Errorf("scheduler: nodelist is empty")
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return nodelist
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}
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// if there is a single node, schedule it on that
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if len(nodelist) == 1 {
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return nodelist
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}
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return runScheduler(nodelist, nmap)
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}
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