forked from NVIDIA/aistore
/
bmd.go
253 lines (231 loc) · 5.68 KB
/
bmd.go
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// Package meta: cluster-level metadata
/*
* Copyright (c) 2018-2023, NVIDIA CORPORATION. All rights reserved.
*/
package meta
import (
"fmt"
"sort"
"strconv"
"github.com/artashesbalabekyan/aistore/api/apc"
"github.com/artashesbalabekyan/aistore/cmn"
"github.com/artashesbalabekyan/aistore/cmn/debug"
)
type (
// interface to Get current (versioned, immutable) BMD instance
// (for implementation, see ais/bucketmeta.go)
Bowner interface {
Get() (bmd *BMD)
}
Buckets map[string]*cmn.BucketProps
Namespaces map[string]Buckets
Providers map[string]Namespaces
// - BMD is the root of the (providers, namespaces, buckets) hierarchy
// - BMD (instance) can be obtained via Bowner.Get()
// - BMD is immutable and versioned
// - BMD versioning is monotonic and incremental
BMD struct {
Ext any `json:"ext,omitempty"` // within meta-version extensions
Providers Providers `json:"providers"` // (provider, namespace, bucket) hierarchy
UUID string `json:"uuid"` // unique & immutable
Version int64 `json:"version,string"` // gets incremented on every update
}
)
func (m *BMD) String() string {
if m == nil {
return "BMD <nil>"
}
return "BMD v" + strconv.FormatInt(m.Version, 10)
}
func (m *BMD) StringEx() string {
if m == nil {
return "BMD <nil>"
}
na, nar, nc, no := m.numBuckets(false /*check empty*/)
if na+nar+nc+no == 0 {
return fmt.Sprintf("BMD v%d[%s (no buckets)]", m.Version, m.UUID)
}
if nar == 0 && no == 0 {
return fmt.Sprintf("BMD v%d[%s, buckets: ais(%d), cloud(%d)]", m.Version, m.UUID, na, nc)
}
return fmt.Sprintf("BMD v%d[%s, buckets: ais(%d), cloud(%d), remote-ais(%d), remote-other(%d)]",
m.Version, m.UUID, na, nc, nar, no)
}
func (m *BMD) Get(bck *Bck) (p *cmn.BucketProps, present bool) {
buckets := m.getBuckets(bck)
if buckets != nil {
p, present = buckets[bck.Name]
}
return
}
func (m *BMD) Del(bck *Bck) (deleted bool) {
buckets := m.getBuckets(bck)
if buckets == nil {
return
}
if _, present := buckets[bck.Name]; !present {
return
}
delete(buckets, bck.Name)
return true
}
func (m *BMD) Set(bck *Bck, p *cmn.BucketProps) {
buckets := m.getBuckets(bck)
buckets[bck.Name] = p
}
func (m *BMD) Exists(bck *Bck, bckID uint64) (exists bool) {
p, present := m.Get(bck)
if present {
bck.Props = p
if bck.IsAIS() {
exists = bckID != 0 && p.BID == bckID
} else {
exists = p.BID == bckID
}
}
return
}
func (m *BMD) Add(bck *Bck) {
var (
namespaces Namespaces
buckets Buckets
ok bool
)
if namespaces, ok = m.Providers[bck.Provider]; !ok {
namespaces = make(Namespaces, 1)
m.Providers[bck.Provider] = namespaces
}
nsUname := bck.Ns.Uname()
if buckets, ok = namespaces[nsUname]; !ok {
buckets = make(Buckets)
namespaces[nsUname] = buckets
}
buckets[bck.Name] = bck.Props
}
func (m *BMD) IsEmpty() bool {
na, nar, nc, no := m.numBuckets(true)
return na+nar+nc+no == 0
}
func (m *BMD) IsECUsed() (yes bool) {
m.Range(nil, nil, func(bck *Bck) (stop bool) {
if bck.Props.EC.Enabled {
yes, stop = true, true
}
return
})
return
}
// providerQuery == nil: all providers; nsQuery == nil: all namespaces
func (m *BMD) Range(providerQuery *string, nsQuery *cmn.Ns, callback func(*Bck) bool) {
for provider, namespaces := range m.Providers {
if providerQuery != nil && provider != *providerQuery {
continue
}
for nsUname, buckets := range namespaces {
if nsQuery != nil && nsUname != nsQuery.Uname() {
continue
}
for name, props := range buckets {
ns := cmn.ParseNsUname(nsUname)
bck := NewBck(name, provider, ns, props)
if callback(bck) { // break?
return
}
}
}
}
}
func (m *BMD) Select(qbck *cmn.QueryBcks) cmn.Bcks {
var (
cp *string
bcks = cmn.Bcks{} // (json representation: nil slice != empty slice)
)
if qbck.Provider != "" {
cp = &qbck.Provider
}
m.Range(cp, nil, func(bck *Bck) bool {
b := bck.Bucket()
if qbck.Equal(b) || qbck.Contains(b) {
if len(bcks) == 0 {
bcks = make(cmn.Bcks, 0, 8)
}
bcks = append(bcks, bck.Clone())
}
return false
})
sort.Sort(bcks)
return bcks
}
//
// private methods
//
func (m *BMD) getBuckets(bck *Bck) (buckets Buckets) {
if namespaces, ok := m.Providers[bck.Provider]; ok {
buckets = namespaces[bck.Ns.Uname()]
}
return
}
func (m *BMD) numBuckets(checkEmpty bool) (na, nar, nc, no int) {
for provider, namespaces := range m.Providers {
for nsUname, buckets := range namespaces {
ns := cmn.ParseNsUname(nsUname)
if provider == apc.AIS {
if ns.IsRemote() {
nar += len(buckets)
} else {
na += len(buckets)
}
} else if apc.IsCloudProvider(provider) {
nc += len(buckets)
} else {
no += len(buckets)
}
if checkEmpty && (na+nar+nc+no > 0) {
return
}
}
}
return
}
func (m *BMD) initBckGlobalNs(bck *Bck) bool {
namespaces, ok := m.Providers[bck.Provider]
if !ok {
return false
}
buckets, ok := namespaces[cmn.NsGlobal.Uname()]
if !ok {
return false
}
p, present := buckets[bck.Name]
if present {
debug.Assert(bck.Ns.IsGlobal())
bck.Props = p
}
return present
}
func (m *BMD) initBck(bck *Bck) bool {
namespaces, ok := m.Providers[bck.Provider]
if !ok {
return false
}
for nsUname, buckets := range namespaces {
if p, present := buckets[bck.Name]; present {
bck.Props = p
bck.Ns = cmn.ParseNsUname(nsUname)
return true
}
}
return false
}
func (m *BMD) getAllByName(bckName string) (all []Bck) {
for provider, namespace := range m.Providers {
for nsUname, buckets := range namespace {
if props, present := buckets[bckName]; present {
bck := Bck{Name: bckName, Provider: provider, Props: props}
bck.Ns = cmn.ParseNsUname(nsUname)
all = append(all, bck)
}
}
}
return
}