/
tracker.go
130 lines (104 loc) · 2.3 KB
/
tracker.go
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package core
import (
"fmt"
"os"
"path"
"github.com/dgraph-io/badger"
)
//Tracker tracks which hashes are published in IPLD
type Tracker struct {
db *badger.DB
txn *badger.Txn
}
func NewTracker(gitPath string) (*Tracker, error) {
ipldDir := path.Join(gitPath, "ipld")
err := os.MkdirAll(ipldDir, 0755)
if err != nil {
return nil, err
}
opt := badger.DefaultOptions(ipldDir)
db, err := badger.Open(opt)
if err != nil {
return nil, err
}
return &Tracker{
db: db,
}, nil
}
func (t *Tracker) Get(refName string) ([]byte, error) {
txn := t.db.NewTransaction(false)
defer txn.Discard()
it, err := txn.Get([]byte(refName))
if err == badger.ErrKeyNotFound {
return nil, nil
}
if err != nil {
return nil, err
}
return it.ValueCopy(nil)
}
func (t *Tracker) Set(refName string, hash []byte) error {
txn := t.db.NewTransaction(true)
defer txn.Discard()
err := txn.Set([]byte(refName), hash)
if err != nil {
return err
}
return txn.Commit()
}
func (t *Tracker) ListPrefixed(prefix string) (map[string]string, error) {
out := map[string]string{}
txn := t.db.NewTransaction(false)
defer txn.Discard()
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
for it.Seek([]byte(prefix)); it.ValidForPrefix([]byte(prefix)); it.Next() {
item := it.Item()
k := item.Key()
v, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
out[string(k)] = string(v)
}
return out, nil
}
func (t *Tracker) AddEntry(hash []byte) error {
if t.txn == nil {
t.txn = t.db.NewTransaction(true)
}
err := t.txn.Set([]byte(hash), []byte{})
if err != nil && err.Error() == badger.ErrTxnTooBig.Error() {
if err := t.txn.Commit(); err != nil {
return fmt.Errorf("commit: %s", err)
}
t.txn = t.db.NewTransaction(true)
if err := t.txn.Set([]byte(hash), []byte{}); err != nil {
return err
}
} else if err != nil {
return fmt.Errorf("set: %s", err)
}
return nil
}
func (t *Tracker) HasEntry(hash []byte) (bool, error) {
if t.txn == nil {
t.txn = t.db.NewTransaction(true)
}
_, err := t.txn.Get(hash)
if err == badger.ErrKeyNotFound {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
}
func (t *Tracker) Close() error {
if t.txn != nil {
if err := t.txn.Commit(); err != nil {
return err
}
}
return t.db.Close()
}