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backend_full.go
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backend_full.go
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// Copyright (C) 2024 CGI France
//
// This file is part of SILO.
//
// SILO is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// SILO is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with SILO. If not, see <http://www.gnu.org/licenses/>.
package infra
import (
"fmt"
"github.com/cgi-fr/silo/pkg/silo"
"github.com/cockroachdb/pebble"
)
type BackendFull struct {
Backend
}
func NewBackendFull(path string) (BackendFull, error) {
backend, err := NewBackend(path)
if err != nil {
return BackendFull{backend}, err
}
return BackendFull{backend}, nil
}
func (b BackendFull) Snapshot() silo.Snapshot { //nolint:ireturn
return NewSnapshotFull(b.db)
}
type SnapshotFull struct {
db *pebble.DB
nodes map[string][]byte
loaded bool
}
const DefaultFullMapCap = 1024
func NewSnapshotFull(db *pebble.DB) silo.Snapshot { //nolint:ireturn
return &SnapshotFull{
db: db,
nodes: make(map[string][]byte, DefaultFullMapCap),
loaded: false,
}
}
func (s *SnapshotFull) Load() error {
iter, err := s.db.NewIter(&pebble.IterOptions{}) //nolint:exhaustruct
if err != nil {
return fmt.Errorf("%w", err)
}
for iter.First(); iter.Valid(); iter.Next() {
s.nodes[string(iter.Key())] = iter.Value()
}
s.loaded = true
return nil
}
func (s *SnapshotFull) Next() (silo.DataNode, bool, error) {
if !s.loaded {
if err := s.Load(); err != nil {
return silo.DataNode{Key: "", Data: ""}, false, err
}
}
for key := range s.nodes {
node, err := decodeKey([]byte(key))
if err != nil {
return silo.DataNode{Key: "", Data: ""}, false, fmt.Errorf("%w", err)
}
return node, true, nil
}
return silo.DataNode{Key: "", Data: ""}, false, nil
}
func (s *SnapshotFull) PullAll(node silo.DataNode) ([]silo.DataNode, error) {
key, err := node.Binary()
if err != nil {
return nil, fmt.Errorf("%w", err)
}
item, has := s.nodes[string(key)]
if !has {
return []silo.DataNode{}, nil
}
set, err := decode(item)
if err != nil {
return nil, fmt.Errorf("%w", err)
}
delete(s.nodes, string(key))
return set, nil
}
func (s *SnapshotFull) Close() error {
return nil
}