f88e0866fe
Define NeoFS location database based on BoltDB. Implement methods to save the record by key (Put) and to read the record by key (Get). Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
package locodebolt
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
|
|
"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 NeoFS location database.
|
|
//
|
|
// Must not be empty.
|
|
Path string
|
|
}
|
|
|
|
// DB is a descriptor of the NeoFS 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 os.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,
|
|
}
|
|
}
|