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// Package memstore implements in-memory storage for atlas.
package memstore
import (
"bytes"
"crypto/sha256"
"io"
"strings"
"sync"
"github.com/klauspost/compress/gzip"
"github.com/r2northstar/atlas/pkg/api/api0"
)
// AccountStore stores accounts in-memory.
type AccountStore struct {
accounts sync.Map
}
// NewPdataStore creates a new MemoryPdataStore.
func NewAccountStore() *AccountStore {
return &AccountStore{}
}
func (m *AccountStore) GetUIDsByUsername(username string) ([]uint64, error) {
var uids []uint64
if username != "" {
m.accounts.Range(func(_, v any) bool {
if u := v.(api0.Account); strings.EqualFold(u.Username, username) {
uids = append(uids, u.UID)
}
return true
})
}
return uids, nil
}
func (m *AccountStore) GetAccount(uid uint64) (*api0.Account, error) {
v, ok := m.accounts.Load(uid)
if !ok {
return nil, nil
}
a := v.(api0.Account)
return &a, nil
}
func (m *AccountStore) SaveAccount(a *api0.Account) error {
if a != nil {
m.accounts.Store(a.UID, *a)
}
return nil
}
// PdataStore stores pdata in-memory, with optional compression.
type PdataStore struct {
gzip bool
pdata sync.Map
}
type pdataStoreEntry struct {
Hash [sha256.Size]byte
Data []byte
}
// NewPdataStore creates a new MemoryPdataStore.
func NewPdataStore(compress bool) *PdataStore {
return &PdataStore{
gzip: compress,
}
}
func (m *PdataStore) GetPdataHash(uid uint64) ([sha256.Size]byte, bool, error) {
v, ok := m.pdata.Load(uid)
if !ok {
return [sha256.Size]byte{}, ok, nil
}
return v.(pdataStoreEntry).Hash, ok, nil
}
func (m *PdataStore) GetPdataCached(uid uint64, sha [sha256.Size]byte) ([]byte, bool, error) {
v, ok := m.pdata.Load(uid)
if !ok {
return nil, ok, nil
}
e := v.(pdataStoreEntry)
if sha != [sha256.Size]byte{} && sha == e.Hash {
return nil, ok, nil
}
var b []byte
if m.gzip {
r, err := gzip.NewReader(bytes.NewReader(e.Data))
if err != nil {
return nil, ok, err
}
b, err = io.ReadAll(r)
if err != nil {
return nil, ok, err
}
} else {
b = make([]byte, len(e.Data))
copy(b, e.Data)
}
return b, ok, nil
}
func (m *PdataStore) SetPdata(uid uint64, buf []byte) (int, error) {
var b []byte
if m.gzip {
var f bytes.Buffer
w := gzip.NewWriter(&f)
if _, err := w.Write(buf); err != nil {
return 0, err
}
if err := w.Close(); err != nil {
return 0, err
}
b = f.Bytes()
} else {
b = make([]byte, len(buf))
copy(b, buf)
}
m.pdata.Store(uid, pdataStoreEntry{
Hash: sha256.Sum256(buf),
Data: b,
})
return len(b), nil
}
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