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package prefixsqlite
import (
"context"
"embed"
"errors"
"slices"
"filippo.io/torchwood/prefix"
"zombiezen.com/go/sqlite"
"zombiezen.com/go/sqlite/sqlitex"
)
type Storage struct {
pool *sqlitex.Pool
}
//go:embed *.sql
var sql embed.FS
func NewSQLiteStorage(ctx context.Context, dbPath string) (*Storage, error) {
pool, err := sqlitex.NewPool(dbPath, sqlitex.PoolOptions{
PrepareConn: func(conn *sqlite.Conn) error {
if err := conn.CreateFunction("sideof", &sqlite.FunctionImpl{
NArgs: 4,
Deterministic: true,
Scalar: func(ctx sqlite.Context, args []sqlite.Value) (sqlite.Value, error) {
if args[0].Type() != sqlite.TypeBlob || args[1].Type() != sqlite.TypeInteger ||
args[2].Type() != sqlite.TypeBlob || args[3].Type() != sqlite.TypeInteger {
return sqlite.Value{}, errors.New("invalid argument types for sideof")
}
labelBytes, labelBitLen := args[0].Blob(), uint32(args[1].Int64())
prefixBytes, prefixBitLen := args[2].Blob(), uint32(args[3].Int64())
label, err := prefix.NewLabel(labelBitLen, labelBytes)
if err != nil {
return sqlite.Value{}, err
}
prefix, err := prefix.NewLabel(prefixBitLen, prefixBytes)
if err != nil {
return sqlite.Value{}, err
}
return sqlite.IntegerValue(int64(label.SideOf(prefix))), nil
},
}); err != nil {
return err
}
return sqlitex.ExecScript(conn, `
PRAGMA strict_types = ON;
PRAGMA foreign_keys = ON;
`)
},
})
if err != nil {
return nil, err
}
conn, err := pool.Take(ctx)
if err != nil {
pool.Close()
return nil, err
}
defer pool.Put(conn)
if err := sqlitex.ExecuteTransientFS(conn, sql, "create.sql", nil); err != nil {
pool.Close()
return nil, err
}
return &Storage{pool: pool}, nil
}
func (s *Storage) Close() error {
return s.pool.Close()
}
var _ prefix.Storage = (*Storage)(nil)
func (s *Storage) Load(ctx context.Context, label prefix.Label) (*prefix.Node, error) {
conn, err := s.pool.Take(ctx)
if err != nil {
return nil, err
}
defer s.pool.Put(conn)
var node *prefix.Node
if err := sqlitex.ExecuteFS(conn, sql, "load.sql", &sqlitex.ExecOptions{
Args: []any{
label.Bytes(),
label.BitLen(),
},
ResultFunc: func(stmt *sqlite.Stmt) error {
var err error
node, err = nodeFromRow(stmt)
return err
},
}); err != nil {
return nil, err
}
if node == nil {
return nil, prefix.ErrNodeNotFound
}
return node, nil
}
func (s *Storage) LoadPath(ctx context.Context, label prefix.Label) ([]*prefix.Node, error) {
conn, err := s.pool.Take(ctx)
if err != nil {
return nil, err
}
defer s.pool.Put(conn)
var nodes []*prefix.Node
if err := sqlitex.ExecuteFS(conn, sql, "path.sql", &sqlitex.ExecOptions{
Named: map[string]any{
":root_label": prefix.RootLabel.Bytes(),
":root_label_bit_len": prefix.RootLabel.BitLen(),
":label": label.Bytes(),
":label_bit_len": label.BitLen(),
},
ResultFunc: func(stmt *sqlite.Stmt) error {
node, err := nodeFromRow(stmt)
if err != nil {
return err
}
nodes = append(nodes, node)
return nil
},
}); err != nil {
return nil, err
}
slices.Reverse(nodes)
return nodes, nil
}
func nodeFromRow(stmt *sqlite.Stmt) (*prefix.Node, error) {
labelBytes := make([]byte, 32)
stmt.ColumnBytes(0, labelBytes)
labelBitLen := stmt.ColumnInt64(1)
label, err := prefix.NewLabel(uint32(labelBitLen), labelBytes)
if err != nil {
return nil, err
}
leftBytes := make([]byte, 32)
stmt.ColumnBytes(2, leftBytes)
leftBitLen := stmt.ColumnInt64(3)
left, err := prefix.NewLabel(uint32(leftBitLen), leftBytes)
if err != nil {
return nil, err
}
rightBytes := make([]byte, 32)
stmt.ColumnBytes(4, rightBytes)
rightBitLen := stmt.ColumnInt64(5)
right, err := prefix.NewLabel(uint32(rightBitLen), rightBytes)
if err != nil {
return nil, err
}
hashBytes := make([]byte, 32)
stmt.ColumnBytes(6, hashBytes)
return &prefix.Node{
Label: label,
Left: left,
Right: right,
Hash: [32]byte(hashBytes),
}, nil
}
func (s *Storage) Store(ctx context.Context, nodes ...*prefix.Node) error {
conn, err := s.pool.Take(ctx)
if err != nil {
return err
}
defer s.pool.Put(conn)
for _, node := range nodes {
if err := sqlitex.ExecuteFS(conn, sql, "insert.sql", &sqlitex.ExecOptions{
Args: []any{
node.Label.Bytes(), node.Label.BitLen(),
node.Left.Bytes(), node.Left.BitLen(),
node.Right.Bytes(), node.Right.BitLen(),
node.Hash[:],
},
}); err != nil {
return err
}
}
return nil
}
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