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badger.go
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badger.go
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package repository
import (
"encoding/json"
nurl "net/url"
"github.com/dgraph-io/badger"
"github.com/pkg/errors"
)
type badgerRepo struct {
*badger.DB
}
// NewDiskRepository returns a new LinkRepository that stores data in
// disk using Badger DB.
func NewDiskRepository(path string) (LinkRepository, error) {
db, err := badger.Open(badger.DefaultOptions(path))
if err != nil {
return nil, err
}
return &badgerRepo{db}, nil
}
func (db badgerRepo) New(url string) (*Link, error) {
if _, err := nurl.ParseRequestURI(url); err != nil {
return nil, err
}
link := &Link{ID: randomString(), URL: url}
b, err := json.Marshal(link)
if err != nil {
return nil, errors.Wrapf(err, "could not marshal link")
}
txn := db.NewTransaction(true)
if err := txn.Set([]byte(link.ID), b); err != nil {
return nil, err
}
return link, txn.Commit()
}
func (db badgerRepo) get(txn *badger.Txn, id string) (*Link, error) {
item, err := txn.Get([]byte(id))
if err != nil {
if err == badger.ErrKeyNotFound {
return nil, ErrNoSuchLink
}
return nil, err
}
var link Link
err = item.Value(func(data []byte) error {
return json.Unmarshal(data, &link)
})
if err != nil {
return nil, errors.Wrapf(err, "could not unmarshal link")
}
return &link, nil
}
func (db badgerRepo) Get(id string) (*Link, error) {
txn := db.NewTransaction(false)
return db.get(txn, id)
}
func (db badgerRepo) CountVisit(id string) error {
txn := db.NewTransaction(true)
link, err := db.get(txn, id)
if err != nil {
return err
}
link.Count++
b, err := json.Marshal(link)
if err != nil {
return errors.Wrapf(err, "could not marshal link")
}
if err := txn.Set([]byte(link.ID), b); err != nil {
return err
}
return txn.Commit()
}