mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-22 22:30:23 +00:00
257 lines
8.5 KiB
Go
257 lines
8.5 KiB
Go
/*
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Copyright 2020 The Ceph-CSI 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 util
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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"github.com/container-storage-interface/spec/lib/go/csi"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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const (
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keySeparator rune = '/'
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labelSeparator string = ","
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)
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func k8sGetNodeLabels(nodeName string) (map[string]string, error) {
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client := NewK8sClient()
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node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
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if err != nil {
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return nil, fmt.Errorf("failed to get node (%s) information : %v", nodeName, err)
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}
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return node.GetLabels(), nil
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}
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// GetTopologyFromDomainLabels returns the CSI topology map, determined from
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// the domain labels and their values from the CO system
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// Expects domainLabels in arg to be in the format "[prefix/]<name>,[prefix/]<name>,...",.
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func GetTopologyFromDomainLabels(domainLabels, nodeName, driverName string) (map[string]string, error) {
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if domainLabels == "" {
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return nil, nil
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}
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// size checks on domain label prefix
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topologyPrefix := strings.ToLower("topology." + driverName)
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const lenLimit = 63
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if len(topologyPrefix) > lenLimit {
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return nil, fmt.Errorf("computed topology label prefix (%s) for node exceeds length limits", topologyPrefix)
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}
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// driverName is validated, and we are adding a lowercase "topology." to it, so no validation for conformance
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// Convert passed in labels to a map, and check for uniqueness
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labelsToRead := strings.SplitN(domainLabels, labelSeparator, -1)
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DefaultLog("passed in node labels for processing : %+v", labelsToRead)
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labelsIn := make(map[string]bool)
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labelCount := 0
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for _, label := range labelsToRead {
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// as we read the labels from k8s, and check for missing labels,
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// no label conformance checks here
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if _, ok := labelsIn[label]; ok {
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return nil, fmt.Errorf("duplicate label (%s) found in domain labels", label)
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}
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labelsIn[label] = true
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labelCount++
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}
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nodeLabels, err := k8sGetNodeLabels(nodeName)
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if err != nil {
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return nil, err
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}
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// Determine values for requested labels from node labels
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domainMap := make(map[string]string)
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found := 0
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for key, value := range nodeLabels {
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if _, ok := labelsIn[key]; !ok {
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continue
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}
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// label found split name component and store value
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nameIdx := strings.IndexRune(key, keySeparator)
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domain := key[nameIdx+1:]
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domainMap[domain] = value
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labelsIn[key] = false
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found++
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}
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// Ensure all labels are found
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if found != labelCount {
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missingLabels := []string{}
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for key, missing := range labelsIn {
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if missing {
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missingLabels = append(missingLabels, key)
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}
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}
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return nil, fmt.Errorf("missing domain labels %v on node (%s)", missingLabels, nodeName)
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}
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DefaultLog("list of domains processed : %+v", domainMap)
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topology := make(map[string]string)
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for domain, value := range domainMap {
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topology[topologyPrefix+"/"+domain] = value
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// TODO: when implementing domain takeover/giveback, enable a domain value that can remain pinned to the node
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// topology["topology."+driverName+"/"+domain+"-pinned"] = value
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}
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return topology, nil
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}
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type topologySegment struct {
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DomainLabel string `json:"domainLabel"`
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DomainValue string `json:"value"`
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}
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// TopologyConstrainedPool stores the pool name and a list of its associated topology domain values.
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type TopologyConstrainedPool struct {
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PoolName string `json:"poolName"`
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DataPoolName string `json:"dataPool"`
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DomainSegments []topologySegment `json:"domainSegments"`
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}
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// GetTopologyFromRequest extracts TopologyConstrainedPools and passed in accessibility constraints
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// from a CSI CreateVolume request.
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func GetTopologyFromRequest(req *csi.CreateVolumeRequest) (*[]TopologyConstrainedPool, *csi.TopologyRequirement, error) {
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var (
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topologyPools []TopologyConstrainedPool
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)
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// check if parameters have pool configuration pertaining to topology
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topologyPoolsStr := req.GetParameters()["topologyConstrainedPools"]
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if topologyPoolsStr == "" {
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return nil, nil, nil
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}
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// check if there are any accessibility requirements in the request
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accessibilityRequirements := req.GetAccessibilityRequirements()
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if accessibilityRequirements == nil {
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return nil, nil, nil
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}
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// extract topology based pools configuration
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err := json.Unmarshal([]byte(strings.Replace(topologyPoolsStr, "\n", " ", -1)), &topologyPools)
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if err != nil {
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return nil, nil, fmt.Errorf("failed to parse JSON encoded topology constrained pools parameter (%s): %v", topologyPoolsStr, err)
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}
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return &topologyPools, accessibilityRequirements, nil
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}
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// MatchTopologyForPool returns the topology map, if the passed in pool matches any
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// passed in accessibility constraints.
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func MatchTopologyForPool(topologyPools *[]TopologyConstrainedPool,
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accessibilityRequirements *csi.TopologyRequirement, poolName string) (map[string]string, error) {
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var topologyPool []TopologyConstrainedPool
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if topologyPools == nil || accessibilityRequirements == nil {
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return nil, nil
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}
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// find the pool in the list of topology based pools
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for _, value := range *topologyPools {
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if value.PoolName == poolName {
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topologyPool = append(topologyPool, value)
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break
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}
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}
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if len(topologyPool) == 0 {
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return nil, fmt.Errorf("none of the configured topology pools (%+v) matched passed in pool name (%s)",
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topologyPools, poolName)
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}
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_, _, topology, err := FindPoolAndTopology(&topologyPool, accessibilityRequirements)
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return topology, err
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}
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// FindPoolAndTopology loops through passed in "topologyPools" and also related
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// accessibility requirements, to determine which pool matches the requirement.
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// The return variables are, image poolname, data poolname, and topology map of
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// matched requirement.
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func FindPoolAndTopology(topologyPools *[]TopologyConstrainedPool,
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accessibilityRequirements *csi.TopologyRequirement) (string, string, map[string]string, error) {
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if topologyPools == nil || accessibilityRequirements == nil {
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return "", "", nil, nil
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}
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// select pool that fits first topology constraint preferred requirements
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for _, topology := range accessibilityRequirements.GetPreferred() {
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topologyPool := matchPoolToTopology(topologyPools, topology)
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if topologyPool.PoolName != "" {
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return topologyPool.PoolName, topologyPool.DataPoolName, topology.GetSegments(), nil
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}
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}
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// If preferred mismatches, check requisite for a fit
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for _, topology := range accessibilityRequirements.GetRequisite() {
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topologyPool := matchPoolToTopology(topologyPools, topology)
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if topologyPool.PoolName != "" {
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return topologyPool.PoolName, topologyPool.DataPoolName, topology.GetSegments(), nil
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}
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}
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return "", "", nil, fmt.Errorf("none of the topology constrained pools matched requested "+
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"topology constraints : pools (%+v) requested topology (%+v)",
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*topologyPools, *accessibilityRequirements)
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}
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// matchPoolToTopology loops through passed in pools, and for each pool checks if all
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// requested topology segments are present and match the request, returning the first pool
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// that hence matches (or an empty string if none match).
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func matchPoolToTopology(topologyPools *[]TopologyConstrainedPool, topology *csi.Topology) TopologyConstrainedPool {
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domainMap := extractDomainsFromlabels(topology)
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// check if any pool matches all the domain keys and values
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for _, topologyPool := range *topologyPools {
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mismatch := false
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// match all pool topology labels to requested topology
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for _, segment := range topologyPool.DomainSegments {
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if domainValue, ok := domainMap[segment.DomainLabel]; !ok || domainValue != segment.DomainValue {
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mismatch = true
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break
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}
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}
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if mismatch {
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continue
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}
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return topologyPool
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}
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return TopologyConstrainedPool{}
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}
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// extractDomainsFromlabels returns the domain name map, from passed in domain segments,
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// which is of the form [prefix/]<name>.
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func extractDomainsFromlabels(topology *csi.Topology) map[string]string {
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domainMap := make(map[string]string)
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for domainKey, value := range topology.GetSegments() {
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domainIdx := strings.IndexRune(domainKey, keySeparator)
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domain := domainKey[domainIdx+1:]
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domainMap[domain] = value
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}
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return domainMap
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}
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