mirror of
https://github.com/ceph/ceph-csi.git
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ac11d71e19
added helper function to read the clusterID mapping from the mounted file. The clusterID mapping contains below mappings * ClusterID mappings (to cluster to which we are failingover and from which cluster failover happened) * RBD PoolID mapping of between the clusters. * CephFS FscID mapping between the clusters. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
117 lines
3.1 KiB
Go
117 lines
3.1 KiB
Go
/*
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Copyright 2021 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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"errors"
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"fmt"
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"io/ioutil"
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"os"
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)
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// clusterMappingConfigFile is the location of the cluster mapping config file.
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var clusterMappingConfigFile = "/etc/ceph-csi-config/cluster-mapping.json"
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// ClusterMappingInfo holds the details of clusterID mapping and poolID mapping.
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type ClusterMappingInfo struct {
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// ClusterIDMapping holds the details of clusterID mapping
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ClusterIDMapping map[string]string `json:"clusterIDMapping"`
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// rbdpoolIDMappingInfo holds the details of RBD poolID mapping.
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RBDpoolIDMappingInfo []map[string]string `json:"RBDPoolIDMapping"`
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// cephFSpoolIDMappingInfo holds the details of CephFS Fscid mapping.
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CephFSFscIDMappingInfo []map[string]string `json:"CephFSFscIDMapping"`
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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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// "clusterIDMapping": {
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// "site1-storage": "site2-storage"
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// },
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// "RBDPoolIDMapping": [{
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// "1": "2",
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// "11": "12"
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// }],
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// "CephFSFscIDMapping": [{
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// "13": "34",
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// "3": "4"
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// }]
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// }, {
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// "clusterIDMapping": {
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// "site3-storage": "site2-storage"
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// },
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// "RBDPoolIDMapping": [{
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// "5": "2",
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// "16": "12"
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// }],
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// "CephFSFscIDMapping": [{
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// "3": "34",
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// "4": "4"
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// }]
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// ...
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// }]
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func readClusterMappingInfo() (*[]ClusterMappingInfo, error) {
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var info []ClusterMappingInfo
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content, err := ioutil.ReadFile(clusterMappingConfigFile)
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if err != nil {
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err = fmt.Errorf("error fetching clusterID mapping %w", err)
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return nil, err
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}
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err = json.Unmarshal(content, &info)
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if err != nil {
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return nil, fmt.Errorf("unmarshal failed (%w), raw buffer response: %s",
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err, string(content))
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}
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return &info, nil
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}
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// GetClusterMappingInfo returns corresponding cluster details like clusterID's
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// poolID,fscID lists read from configfile.
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func GetClusterMappingInfo(clusterID string) (*[]ClusterMappingInfo, error) {
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var mappingInfo []ClusterMappingInfo
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info, err := readClusterMappingInfo()
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if err != nil {
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// discard not found error as this file is expected to be created by
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// the admin in case of failover.
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if errors.Is(err, os.ErrNotExist) {
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return nil, nil
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}
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return nil, fmt.Errorf("failed to fetch cluster mapping: %w", err)
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}
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for _, i := range *info {
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for key, val := range i.ClusterIDMapping {
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// Same file will be copied to the failover cluster check for both
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// key and value to check clusterID mapping exists
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if key == clusterID || val == clusterID {
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mappingInfo = append(mappingInfo, i)
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}
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}
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}
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// if the mapping is not found return response as nil
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if len(mappingInfo) == 0 {
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return nil, nil
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}
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return &mappingInfo, nil
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}
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