frostfs-node/pkg/util/locode/db/boltdb/db.go
Stanislav Bogatyrev cb016d53a6 [#1] Fix comments and error messages
Signed-off-by: Stanislav Bogatyrev <s.bogatyrev@yadro.com>
2023-02-06 17:41:14 +03:00

73 lines
1.6 KiB
Go

package locodebolt
import (
"fmt"
"io/fs"
"go.etcd.io/bbolt"
)
// Prm groups the required parameters of the DB's constructor.
//
// All values must comply with the requirements imposed on them.
// Passing incorrect parameter values will result in constructor
// failure (error or panic depending on the implementation).
type Prm struct {
// Path to BoltDB file with FrostFS location database.
//
// Must not be empty.
Path string
}
// DB is a descriptor of the FrostFS BoltDB location database.
//
// For correct operation, DB must be created
// using the constructor (New) based on the required parameters
// and optional components.
//
// After successful creation,
// DB must be opened through Open call. After successful opening,
// DB is ready to work through API (until Close call).
//
// Upon completion of work with the DB, it must be closed
// by Close method.
type DB struct {
path string
mode fs.FileMode
boltOpts *bbolt.Options
bolt *bbolt.DB
}
const invalidPrmValFmt = "invalid parameter %s (%T):%v"
func panicOnPrmValue(n string, v interface{}) {
panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
}
// New creates a new instance of the DB.
//
// Panics if at least one value of the parameters is invalid.
//
// The created DB requires calling the Open method in order
// to initialize required resources.
func New(prm Prm, opts ...Option) *DB {
switch {
case prm.Path == "":
panicOnPrmValue("Path", prm.Path)
}
o := defaultOpts()
for i := range opts {
opts[i](o)
}
return &DB{
path: prm.Path,
mode: o.mode,
boltOpts: o.boltOpts,
}
}