mirror of
https://github.com/ceph/ceph-csi.git
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9cec05f484
This commit adds util functions related to read affinity and unit testcases for the same. Signed-off-by: Praveen M <m.praveen@ibm.com>
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
/*
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Copyright 2023 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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"fmt"
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"strings"
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)
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// ConstructReadAffinityMapOption constructs a read affinity map option based on the provided crushLocationMap.
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// It appends crush location labels in the format
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// "read_from_replica=localize,crush_location=label1:value1|label2:value2|...".
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func ConstructReadAffinityMapOption(crushLocationMap map[string]string) string {
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if len(crushLocationMap) == 0 {
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return ""
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}
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var b strings.Builder
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b.WriteString("read_from_replica=localize,crush_location=")
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first := true
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for key, val := range crushLocationMap {
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if first {
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b.WriteString(fmt.Sprintf("%s:%s", key, val))
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first = false
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} else {
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b.WriteString(fmt.Sprintf("|%s:%s", key, val))
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}
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}
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return b.String()
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}
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// GetReadAffinityMapOptions retrieves the readAffinityMapOptions from the CSI config file if it exists.
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// If not, it falls back to returning the `cliReadAffinityMapOptions` from the command line.
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// If neither of these options is available, it returns an empty string.
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func GetReadAffinityMapOptions(
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clusterID, cliReadAffinityMapOptions string, nodeLabels map[string]string,
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) (string, error) {
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var (
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err error
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configReadAffinityEnabled bool
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configCrushLocationLabels string
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)
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configReadAffinityEnabled, configCrushLocationLabels, err = GetCrushLocationLabels(CsiConfigFile, clusterID)
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if err != nil {
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return "", err
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}
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if !configReadAffinityEnabled {
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return "", nil
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}
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if configCrushLocationLabels == "" {
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return cliReadAffinityMapOptions, nil
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}
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crushLocationMap := GetCrushLocationMap(configCrushLocationLabels, nodeLabels)
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readAffinityMapOptions := ConstructReadAffinityMapOption(crushLocationMap)
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return readAffinityMapOptions, nil
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}
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