forked from whyrusleeping/bolt-datastore
/
datastore.go
171 lines (148 loc) · 3.67 KB
/
datastore.go
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package boltds
import (
bolt "github.com/boltdb/bolt"
ds "github.com/jbenet/go-datastore"
"github.com/jbenet/go-datastore/Godeps/_workspace/src/github.com/jbenet/goprocess"
query "github.com/jbenet/go-datastore/query"
)
// boltDatastore implements ds.Datastore
// TODO: use buckets to represent the heirarchy of the ds.Keys
type boltDatastore struct {
db *bolt.DB
bucketName []byte
}
func NewBoltDatastore(path, bucket string) (*boltDatastore, error) {
db, err := bolt.Open(path+"/bolt.db", 0600, nil)
if err != nil {
return nil, err
}
// TODO: need to do db.Close() sometime...
err = db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists([]byte(bucket))
return err
})
if err != nil {
return nil, err
}
return &boltDatastore{
db: db,
bucketName: []byte(bucket),
}, nil
}
func (bd *boltDatastore) Close() error {
return bd.db.Close()
}
func (bd *boltDatastore) Delete(key ds.Key) error {
return bd.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(bd.bucketName).Delete(key.Bytes())
})
}
func (bd *boltDatastore) Get(key ds.Key) (interface{}, error) {
var out []byte
err := bd.db.View(func(tx *bolt.Tx) error {
mmval := tx.Bucket(bd.bucketName).Get(key.Bytes())
if mmval == nil {
return ds.ErrNotFound
}
out = make([]byte, len(mmval))
copy(out, mmval)
return nil
})
if err != nil {
return nil, err
}
return out, err
}
func (bd *boltDatastore) ConsumeValue(key ds.Key, f func([]byte) error) error {
return bd.db.View(func(tx *bolt.Tx) error {
mmval := tx.Bucket(bd.bucketName).Get(key.Bytes())
if mmval == nil {
return ds.ErrNotFound
}
return f(mmval)
})
}
func (bd *boltDatastore) Has(key ds.Key) (bool, error) {
var found bool
err := bd.db.View(func(tx *bolt.Tx) error {
val := tx.Bucket(bd.bucketName).Get(key.Bytes())
found = (val != nil)
return nil
})
return found, err
}
func (bd *boltDatastore) Put(key ds.Key, val interface{}) error {
bval, ok := val.([]byte)
if !ok {
return ds.ErrInvalidType
}
return bd.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(bd.bucketName).Put(key.Bytes(), bval)
})
}
func (bd *boltDatastore) PutMany(data map[ds.Key]interface{}) error {
return bd.db.Update(func(tx *bolt.Tx) error {
buck := tx.Bucket(bd.bucketName)
for k, v := range data {
bval, ok := v.([]byte)
if !ok {
return ds.ErrInvalidType
}
err := buck.Put(k.Bytes(), bval)
if err != nil {
return err
}
}
return nil
})
}
func (bd *boltDatastore) Query(q query.Query) (query.Results, error) {
qrb := query.NewResultBuilder(q)
qrb.Process.Go(func(worker goprocess.Process) {
bd.db.View(func(tx *bolt.Tx) error {
buck := tx.Bucket(bd.bucketName)
c := buck.Cursor()
var prefix []byte
if qrb.Query.Prefix != "" {
prefix = []byte(qrb.Query.Prefix)
}
cur := 0
sent := 0
for k, v := c.Seek(prefix); k != nil; k, v = c.Next() {
if cur < qrb.Query.Offset {
cur++
continue
}
if qrb.Query.Limit > 0 && sent >= qrb.Query.Limit {
break
}
dk := ds.NewKey(string(k)).String()
e := query.Entry{Key: dk}
if !qrb.Query.KeysOnly {
buf := make([]byte, len(v))
copy(buf, v)
e.Value = buf
}
select {
case qrb.Output <- query.Result{Entry: e}: // we sent it out
sent++
case <-worker.Closing(): // client told us to end early.
break
}
cur++
}
return nil
})
})
// go wait on the worker (without signaling close)
go qrb.Process.CloseAfterChildren()
qr := qrb.Results()
for _, f := range q.Filters {
qr = query.NaiveFilter(qr, f)
}
for _, o := range q.Orders {
qr = query.NaiveOrder(qr, o)
}
return qr, nil
}
func (bd *boltDatastore) IsThreadSafe() {}