// GetRecentRolls retrieves the most recent N issues from the database.
func (d *db) GetRecentRolls(N int) ([]*autoroll.AutoRollIssue, error) {
var rv []*autoroll.AutoRollIssue
if err := d.db.View(func(tx *bolt.Tx) error {
// Retrieve the issue keys from the by-date bucket.
byDate := tx.Bucket(BUCKET_ROLLS_BY_DATE)
c := byDate.Cursor()
keys := make([][]byte, 0, N)
for k, v := c.Last(); k != nil && len(keys) < N; k, v = c.Prev() {
keys = append(keys, v)
}
// Retrieve the issues themselves.
b := tx.Bucket(BUCKET_ROLLS)
rv = make([]*autoroll.AutoRollIssue, 0, len(keys))
for _, k := range keys {
serialized := b.Get(k)
if serialized == nil {
return fmt.Errorf("DB consistency error: bucket %s contains data not present in bucket %s!", BUCKET_ROLLS_BY_DATE, BUCKET_ROLLS)
}
var a autoroll.AutoRollIssue
if err := json.Unmarshal(serialized, &a); err != nil {
return err
}
a.Created = a.Created.UTC()
a.Modified = a.Modified.UTC()
rv = append(rv, &a)
}
return nil
}); err != nil {
return nil, err
}
return rv, nil
}
// GetRoll retrieves the given issue from the database.
func (d *db) GetRoll(issue int64) (*autoroll.AutoRollIssue, error) {
var a *autoroll.AutoRollIssue
if err := d.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(BUCKET_ROLLS)
serialized := b.Get(issueToRollKey(issue))
if serialized == nil {
return nil
}
a = &autoroll.AutoRollIssue{}
if err := json.Unmarshal(serialized, a); err != nil {
return err
}
a.Created = a.Created.UTC()
a.Modified = a.Modified.UTC()
return nil
}); err != nil {
return nil, err
}
return a, nil
}