112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package storage
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import (
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"bytes"
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"context"
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"time"
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"encoding/binary"
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"git.defalsify.org/vise.git/db"
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)
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type TimedDb struct {
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db.Db
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tdb *SubPrefixDb
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ttl time.Duration
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parentPfx uint8
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parentSession []byte
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matchPfx map[uint8][][]byte
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}
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func NewTimedDb(db db.Db, ttl time.Duration) *TimedDb {
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var b [2]byte
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binary.BigEndian.PutUint16(b[:], SUBPREFIX_TIME)
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sdb := NewSubPrefixDb(db, b[:])
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return &TimedDb{
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Db: db,
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tdb: sdb,
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ttl: ttl,
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}
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}
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func(tib *TimedDb) WithMatch(pfx uint8, keyPart []byte) *TimedDb {
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if tib.matchPfx == nil {
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tib.matchPfx = make(map[uint8][][]byte)
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}
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tib.matchPfx[pfx] = append(tib.matchPfx[pfx], keyPart)
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return tib
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}
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func(tib *TimedDb) checkPrefix(pfx uint8, key []byte) bool {
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var v []byte
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if tib.matchPfx == nil {
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return true
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}
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for _, v = range(tib.matchPfx[pfx]) {
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l := len(v)
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k := append(tib.parentSession, key...)
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if l > len(k) {
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continue
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}
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logg.Debugf("check the prefix", "v", v, "k", k, "l", l )
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if bytes.Equal(v, k[:l]) {
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return true
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}
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}
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return false
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}
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func(tib *TimedDb) SetPrefix(pfx uint8) {
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tib.Db.SetPrefix(pfx)
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tib.parentPfx = pfx
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}
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func(tib *TimedDb) SetSession(session string) {
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tib.Db.SetSession(session)
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tib.parentSession = []byte(session)
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}
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func(tib *TimedDb) Put(ctx context.Context, key []byte, val []byte) error {
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t := time.Now()
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b, err := t.MarshalBinary()
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if err != nil {
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return err
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}
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err = tib.Db.Put(ctx, key, val)
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if err != nil {
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return err
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}
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defer func() {
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tib.parentPfx = 0
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tib.parentSession = nil
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}()
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if tib.checkPrefix(tib.parentPfx, key) {
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tib.tdb.SetSession("")
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k := db.ToSessionKey(tib.parentPfx, []byte(tib.parentSession), key)
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k = append([]byte{tib.parentPfx}, k...)
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err = tib.tdb.Put(ctx, k, b)
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if err != nil {
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logg.ErrorCtxf(ctx, "failed to update timestamp of record", err)
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}
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}
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return nil
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}
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func(tib *TimedDb) Stale(ctx context.Context, pfx uint8, sessionId string, key []byte) bool {
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tib.tdb.SetSession("")
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b := db.ToSessionKey(pfx, []byte(sessionId), key)
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b = append([]byte{pfx}, b...)
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v, err := tib.tdb.Get(ctx, b)
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if err != nil {
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logg.ErrorCtxf(ctx, "no time entry", "key", key, "b", b)
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return false
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}
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t_now := time.Now()
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t_then := time.Time{}
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err = t_then.UnmarshalBinary(v)
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if err != nil {
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return false
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}
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return t_now.After(t_then.Add(tib.ttl))
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}
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