/
opendb.go
75 lines (64 loc) · 2.22 KB
/
opendb.go
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// Copyright 2021 FerretDB Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pool
import (
"context"
"database/sql"
"go.uber.org/zap"
_ "modernc.org/sqlite" // register database/sql driver
"github.com/FerretDB/FerretDB/internal/util/fsql"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
"github.com/FerretDB/FerretDB/internal/util/state"
)
// openDB opens existing database or creates a new one.
//
// All valid FerretDB database names are valid SQLite database names / file names,
// so no validation is needed.
// One exception is very long full path names for the filesystem,
// but we don't check it.
func openDB(name, uri string, memory bool, l *zap.Logger, sp *state.Provider) (*fsql.DB, error) {
db, err := sql.Open("sqlite", uri)
if err != nil {
return nil, lazyerrors.Error(err)
}
db.SetConnMaxIdleTime(0)
db.SetConnMaxLifetime(0)
db.SetMaxIdleConns(100)
db.SetMaxOpenConns(100)
// Each connection to in-memory database uses its own database.
// See https://www.sqlite.org/inmemorydb.html.
// We don't want that.
if memory {
db.SetMaxIdleConns(1)
db.SetMaxOpenConns(1)
}
if err = db.Ping(); err != nil {
_ = db.Close()
return nil, lazyerrors.Error(err)
}
// do it only once because version can't change
if sp.Get().BackendVersion == "" {
err := sp.Update(func(s *state.State) {
s.BackendName = "SQLite"
row := db.QueryRowContext(context.Background(), "SELECT sqlite_version()")
if err := row.Scan(&s.BackendVersion); err != nil {
l.Error("sqlite.metadata.pool.openDB: failed to query SQLite version", zap.Error(err))
}
})
if err != nil {
l.Error("sqlite.metadata.pool.openDB: failed to update state", zap.Error(err))
}
}
return fsql.WrapDB(db, name, l), nil
}