// Wrap wraps a given datastore with a key-prefix.
func Wrap(child ds.Datastore, prefix ds.Key) ktds.Datastore {
if child == nil {
panic("child (ds.Datastore) is nil")
}
return ktds.Wrap(child, PrefixTransform(prefix))
}
func (ks *DSSuite) TestBasic(c *C) {
pair := &kt.Pair{
Convert: func(k ds.Key) ds.Key {
return ds.NewKey("/abc").Child(k)
},
Invert: func(k ds.Key) ds.Key {
// remove abc prefix
l := k.List()
if l[0] != "abc" {
panic("key does not have prefix. convert failed?")
}
return ds.KeyWithNamespaces(l[1:])
},
}
mpds := ds.NewMapDatastore()
ktds := kt.Wrap(mpds, pair)
keys := strsToKeys([]string{
"foo",
"foo/bar",
"foo/bar/baz",
"foo/barb",
"foo/bar/bazb",
"foo/bar/baz/barb",
})
for _, k := range keys {
err := ktds.Put(k, []byte(k.String()))
c.Check(err, Equals, nil)
}
for _, k := range keys {
v1, err := ktds.Get(k)
c.Check(err, Equals, nil)
c.Check(bytes.Equal(v1.([]byte), []byte(k.String())), Equals, true)
v2, err := mpds.Get(ds.NewKey("abc").Child(k))
c.Check(err, Equals, nil)
c.Check(bytes.Equal(v2.([]byte), []byte(k.String())), Equals, true)
}
listA, errA := mpds.KeyList()
listB, errB := ktds.KeyList()
c.Check(errA, Equals, nil)
c.Check(errB, Equals, nil)
c.Check(len(listA), Equals, len(listB))
// sort them cause yeah.
sort.Sort(ds.KeySlice(listA))
sort.Sort(ds.KeySlice(listB))
for i, kA := range listA {
kB := listB[i]
c.Check(pair.Invert(kA), Equals, kB)
c.Check(kA, Equals, pair.Convert(kB))
}
}
func makeDatastore(cfg config.Datastore) (u.ThreadSafeDatastoreCloser, error) {
if len(cfg.Type) == 0 {
return nil, debugerror.Errorf("config datastore.type required")
}
switch cfg.Type {
case "leveldb":
return makeLevelDBDatastore(cfg)
case "memory":
return u.CloserWrap(syncds.MutexWrap(ds.NewMapDatastore())), nil
case "fs":
log.Warning("using fs.Datastore at .datastore for testing.")
d, err := fsds.NewDatastore(".datastore") // for testing!!
if err != nil {
return nil, err
}
ktd := ktds.Wrap(d, u.B58KeyConverter)
return u.CloserWrap(syncds.MutexWrap(ktd)), nil
}
return nil, debugerror.Errorf("Unknown datastore type: %s", cfg.Type)
}