mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 08:20:23 +00:00
111 lines
3.1 KiB
Go
111 lines
3.1 KiB
Go
/*
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Copyright 2019 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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"encoding/json"
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"fmt"
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"io/ioutil"
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"strings"
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)
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const (
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// defaultCsiSubvolumeGroup defines the default name for the CephFS CSI subvolumegroup.
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// This was hardcoded once and defaults to the old value to keep backward compatibility.
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defaultCsiSubvolumeGroup = "csi"
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)
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// ClusterInfo strongly typed JSON spec for the below JSON structure.
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type ClusterInfo struct {
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// ClusterID is used for unique identification
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ClusterID string `json:"clusterID"`
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// Monitors is monitor list for corresponding cluster ID
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Monitors []string `json:"monitors"`
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// CephFS contains CephFS specific options
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CephFS struct {
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// SubvolumeGroup contains the name of the SubvolumeGroup for CSI volumes
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SubvolumeGroup string `json:"subvolumeGroup"`
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} `json:"cephFS"`
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}
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// Expected JSON structure in the passed in config file is,
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// [
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// {
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// "clusterID": "<cluster-id>",
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// "monitors":
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// [
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// "<monitor-value>",
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// "<monitor-value>",
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// ...
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// ],
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// "cephFS": {
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// "subvolumeGroup": "<subvolumegroup for cephfs volumes>"
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// }
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// },
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// ...
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// ].
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func readClusterInfo(pathToConfig, clusterID string) (*ClusterInfo, error) {
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var config []ClusterInfo
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// #nosec
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content, err := ioutil.ReadFile(pathToConfig)
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if err != nil {
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err = fmt.Errorf("error fetching configuration for cluster ID (%s). (%s)", clusterID, err)
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return nil, err
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}
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err = json.Unmarshal(content, &config)
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if err != nil {
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return nil, fmt.Errorf("unmarshal failed: %v. raw buffer response: %s",
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err, string(content))
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}
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for _, cluster := range config {
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if cluster.ClusterID == clusterID {
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return &cluster, nil
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}
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}
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return nil, fmt.Errorf("missing configuration for cluster ID (%s)", clusterID)
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}
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// Mons returns a comma separated MON list from the csi config for the given clusterID.
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func Mons(pathToConfig, clusterID string) (string, error) {
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cluster, err := readClusterInfo(pathToConfig, clusterID)
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if err != nil {
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return "", err
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}
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if len(cluster.Monitors) == 0 {
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return "", fmt.Errorf("empty monitor list for cluster ID (%s) in config", clusterID)
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}
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return strings.Join(cluster.Monitors, ","), nil
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}
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// CephFSSubvolumeGroup returns the subvolumeGroup for CephFS volumes. If not set, it returns the default value "csi".
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func CephFSSubvolumeGroup(pathToConfig, clusterID string) (string, error) {
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cluster, err := readClusterInfo(pathToConfig, clusterID)
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if err != nil {
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return "", err
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}
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if cluster.CephFS.SubvolumeGroup == "" {
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return defaultCsiSubvolumeGroup, nil
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}
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return cluster.CephFS.SubvolumeGroup, nil
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}
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