/
crush.go
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/
crush.go
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/*
Copyright 2016 The Rook Authors. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package client
import (
"encoding/json"
"fmt"
"regexp"
"strconv"
"strings"
"github.com/pkg/errors"
"github.com/rook/rook/pkg/clusterd"
)
// CrushMap is the go representation of a CRUSH map
type CrushMap struct {
Devices []struct {
ID int `json:"id"`
Name string `json:"name"`
Class string `json:"class"`
} `json:"devices"`
Types []struct {
ID int `json:"type_id"`
Name string `json:"name"`
} `json:"types"`
Buckets []struct {
ID int `json:"id"`
Name string `json:"name"`
TypeID int `json:"type_id"`
TypeName string `json:"type_name"`
Weight int `json:"weight"`
Alg string `json:"alg"`
Hash string `json:"hash"`
Items []struct {
ID int `json:"id"`
Weight int `json:"weight"`
Pos int `json:"pos"`
} `json:"items"`
} `json:"buckets"`
Rules []struct {
ID int `json:"rule_id"`
Name string `json:"rule_name"`
Ruleset int `json:"ruleset"`
Type int `json:"type"`
MinSize int `json:"min_size"`
MaxSize int `json:"max_size"`
Steps []struct {
Operation string `json:"op"`
Number int `json:"num"`
Item int `json:"item"`
ItemName string `json:"item_name"`
Type string `json:"type"`
} `json:"steps"`
} `json:"rules"`
Tunables struct {
// Add if necessary
} `json:"tunables"`
}
// CrushFindResult is go representation of the Ceph osd find command output
type CrushFindResult struct {
ID int `json:"osd"`
IP string `json:"ip"`
Host string `json:"host,omitempty"`
Location map[string]string `json:"crush_location"`
}
// GetCrushMap fetches the Ceph CRUSH map
func GetCrushMap(context *clusterd.Context, clusterName string) (CrushMap, error) {
var c CrushMap
args := []string{"osd", "crush", "dump"}
buf, err := NewCephCommand(context, clusterName, args).Run()
if err != nil {
return c, errors.Wrapf(err, "failed to get crush map. %s", string(buf))
}
err = json.Unmarshal(buf, &c)
if err != nil {
return c, errors.Wrap(err, "failed to unmarshal crush map")
}
return c, nil
}
// FindOSDInCrushMap finds an OSD in the CRUSH map
func FindOSDInCrushMap(context *clusterd.Context, clusterName string, osdID int) (*CrushFindResult, error) {
args := []string{"osd", "find", strconv.Itoa(osdID)}
buf, err := NewCephCommand(context, clusterName, args).Run()
if err != nil {
return nil, errors.Wrapf(err, "failed to find osd.%d in crush map: %s", osdID, string(buf))
}
var result CrushFindResult
if err := json.Unmarshal(buf, &result); err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal crush find result: %s", string(buf))
}
return &result, nil
}
// GetCrushHostName gets the hostname where an OSD is running on
func GetCrushHostName(context *clusterd.Context, clusterName string, osdID int) (string, error) {
result, err := FindOSDInCrushMap(context, clusterName, osdID)
if err != nil {
return "", err
}
return result.Location["host"], nil
}
// NormalizeCrushName replaces . with -
func NormalizeCrushName(name string) string {
return strings.Replace(name, ".", "-", -1)
}
// IsNormalizedCrushNameEqual returns true if normalized is either equal to or the normalized version of notNormalized
// a crush name is normalized if it comes from the crushmap or has passed through the NormalizeCrushName function.
func IsNormalizedCrushNameEqual(notNormalized, normalized string) bool {
if notNormalized == normalized || NormalizeCrushName(notNormalized) == normalized {
return true
}
return false
}
// UpdateCrushMapValue is for updating the location in the crush map
// this is not safe for incorrectly formatted strings
func UpdateCrushMapValue(pairs *[]string, key, value string) {
found := false
property := formatProperty(key, value)
for i, pair := range *pairs {
entry := strings.Split(pair, "=")
if key == entry[0] {
(*pairs)[i] = property
found = true
}
}
if !found {
*pairs = append(*pairs, property)
}
}
func isValidCrushFieldFormat(pair string) bool {
matched, err := regexp.MatchString("^.+=.+$", pair)
return matched && err == nil
}
func isCrushFieldSet(fieldName string, pairs []string) bool {
for _, p := range pairs {
kv := strings.Split(p, "=")
if len(kv) == 2 && kv[0] == fieldName && kv[1] != "" {
return true
}
}
return false
}
func formatProperty(name, value string) string {
return fmt.Sprintf("%s=%s", name, value)
}
// GetOSDOnHost returns the list of osds running on a given host
func GetOSDOnHost(context *clusterd.Context, clusterName, node string) (string, error) {
args := []string{"osd", "crush", "ls", node}
buf, err := NewCephCommand(context, clusterName, args).Run()
if err != nil {
return "", errors.Wrapf(err, "failed to get osd list on host. %s", string(buf))
}
return string(buf), nil
}