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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package sqlitedriver
import (
"database/sql"
"github.com/algorand/go-algorand/util/db"
)
//msgp:ignore MerkleCommitter
type merkleCommitter struct {
e db.Executable
deleteStmt *sql.Stmt
insertStmt *sql.Stmt
selectStmt *sql.Stmt
}
// MakeMerkleCommitter creates a MerkleCommitter object that implements the merkletrie.Committer interface allowing storing and loading
// merkletrie pages from a sqlite database.
func MakeMerkleCommitter(e db.Executable, staging bool) (mc *merkleCommitter, err error) {
mc = &merkleCommitter{e: e}
accountHashesTable := "accounthashes"
if staging {
accountHashesTable = "catchpointaccounthashes"
}
mc.deleteStmt, err = e.Prepare("DELETE FROM " + accountHashesTable + " WHERE id=?")
if err != nil {
return nil, err
}
mc.insertStmt, err = e.Prepare("INSERT OR REPLACE INTO " + accountHashesTable + "(id, data) VALUES(?, ?)")
if err != nil {
return nil, err
}
mc.selectStmt, err = e.Prepare("SELECT data FROM " + accountHashesTable + " WHERE id = ?")
if err != nil {
return nil, err
}
return mc, nil
}
// StorePage is the merkletrie.Committer interface implementation, stores a single page in a sqlite database table.
func (mc *merkleCommitter) StorePage(page uint64, content []byte) error {
if len(content) == 0 {
_, err := mc.deleteStmt.Exec(page)
return err
}
_, err := mc.insertStmt.Exec(page, content)
return err
}
// LoadPage is the merkletrie.Committer interface implementation, load a single page from a sqlite database table.
func (mc *merkleCommitter) LoadPage(page uint64) (content []byte, err error) {
err = mc.selectStmt.QueryRow(page).Scan(&content)
if err == sql.ErrNoRows {
content = nil
err = nil
return
} else if err != nil {
return nil, err
}
return content, nil
}
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