status-go/protocol/sqlite/db.go

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package sqlite
import (
"database/sql"
"fmt"
"os"
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"github.com/pkg/errors"
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_ "github.com/mutecomm/go-sqlcipher" // We require go sqlcipher that overrides default implementation
"github.com/status-im/migrate/v4"
"github.com/status-im/migrate/v4/database/sqlcipher"
bindata "github.com/status-im/migrate/v4/source/go_bindata"
mvdsmigrations "github.com/vacp2p/mvds/persistenceutil"
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)
// The default number of kdf iterations in sqlcipher (from version 3.0.0)
// https://github.com/sqlcipher/sqlcipher/blob/fda4c68bb474da7e955be07a2b807bda1bb19bd2/CHANGELOG.md#300---2013-11-05
// https://www.zetetic.net/sqlcipher/sqlcipher-api/#kdf_iter
const defaultKdfIterationsNumber = 64000 // nolint: deadcode,varcheck,unused
// The reduced number of kdf iterations (for performance reasons) which is
// currently used for derivation of the database key
// https://github.com/status-im/status-go/pull/1343
// https://notes.status.im/i8Y_l7ccTiOYq09HVgoFwA
const reducedKdfIterationsNumber = 3200
const inMemoryPath = ":memory:"
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// MigrationConfig is a struct that allows to define bindata migrations.
type MigrationConfig struct {
AssetNames []string
AssetGetter func(name string) ([]byte, error)
}
// Open opens or initializes a new database for a given file path.
// MigrationConfig is optional but if provided migrations are applied automatically.
func Open(path, key string) (*sql.DB, error) {
return open(path, key, reducedKdfIterationsNumber)
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}
// OpenInMemory opens an in memory SQLite database.
// Number of KDF iterations is reduced to 0.
func OpenInMemory() (*sql.DB, error) {
return open(inMemoryPath, "", 0)
}
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// OpenWithIter allows to open a new database with a custom number of kdf iterations.
// Higher kdf iterations number makes it slower to open the database.
func OpenWithIter(path, key string, kdfIter int) (*sql.DB, error) {
return open(path, key, kdfIter)
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}
func open(path string, key string, kdfIter int) (*sql.DB, error) {
if path != inMemoryPath {
_, err := os.OpenFile(path, os.O_CREATE, 0644)
if err != nil {
return nil, err
}
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}
db, err := sql.Open("sqlite3", path)
if err != nil {
return nil, err
}
keyString := fmt.Sprintf("PRAGMA key = '%s'", key)
// Disable concurrent access as not supported by the driver
db.SetMaxOpenConns(1)
if _, err = db.Exec("PRAGMA foreign_keys=ON"); err != nil {
return nil, err
}
if _, err = db.Exec(keyString); err != nil {
return nil, err
}
kdfString := fmt.Sprintf("PRAGMA kdf_iter = '%d'", kdfIter)
if _, err = db.Exec(kdfString); err != nil {
return nil, err
}
if err := Migrate(db); err != nil {
return nil, err
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}
return db, nil
}
// ApplyMigrations allows to apply bindata migrations on the current *sql.DB.
// `assetNames` is a list of assets with migrations and `assetGetter` is responsible
// for returning the content of the asset with a given name.
func ApplyMigrations(db *sql.DB, assetNames []string, assetGetter func(name string) ([]byte, error)) error {
resources := bindata.Resource(
assetNames,
assetGetter,
)
source, err := bindata.WithInstance(resources)
if err != nil {
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return errors.Wrap(err, "failed to create migration source")
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}
driver, err := sqlcipher.WithInstance(db, &sqlcipher.Config{
MigrationsTable: "status_protocol_go_" + sqlcipher.DefaultMigrationsTable,
})
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if err != nil {
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return errors.Wrap(err, "failed to create driver")
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}
m, err := migrate.NewWithInstance(
"go-bindata",
source,
"sqlcipher",
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driver,
)
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if err != nil {
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return errors.Wrap(err, "failed to create migration instance")
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}
if err = m.Up(); err != migrate.ErrNoChange {
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return errors.Wrap(err, "failed to migrate")
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}
return nil
}
func Migrate(database *sql.DB) error {
// Apply migrations for all components.
err := mvdsmigrations.Migrate(database)
if err != nil {
return errors.Wrap(err, "failed to apply mvds migrations")
}
migrationNames, migrationGetter, err := prepareMigrations(defaultMigrations)
if err != nil {
return errors.Wrap(err, "failed to prepare status-go/protocol migrations")
}
err = ApplyMigrations(database, migrationNames, migrationGetter)
if err != nil {
return errors.Wrap(err, "failed to apply status-go/protocol migrations")
}
return nil
}