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Merge pull request #1803 from calmh/kvspaceclear

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Reset a namespaced kv-store
This commit is contained in:
Audrius Butkevicius 2015-05-13 15:43:52 +03:00
commit 19b9f15da3
2 changed files with 57 additions and 0 deletions
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22
internal/db/namespaced.go
View File

@ -11,6 +11,7 @@ import (
"time"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/util"
)
// NamespacedKV is a simple key-value store using a specific namespace within
@ -29,6 +30,27 @@ func NewNamespacedKV(db *leveldb.DB, prefix string) *NamespacedKV {
}
}
// Reset removes all entries in this namespace.
func (n *NamespacedKV) Reset() {
it := n.db.NewIterator(util.BytesPrefix(n.prefix), nil)
defer it.Release()
batch := new(leveldb.Batch)
for it.Next() {
batch.Delete(it.Key())
if batch.Len() > batchFlushSize {
if err := n.db.Write(batch, nil); err != nil {
panic(err)
}
batch.Reset()
}
}
if batch.Len() > 0 {
if err := n.db.Write(batch, nil); err != nil {
panic(err)
}
}
}
// PutInt64 stores a new int64. Any existing value (even if of another type)
// is overwritten.
func (n *NamespacedKV) PutInt64(key string, val int64) {

35
internal/db/namespaced_test.go
View File

@ -90,3 +90,38 @@ func TestNamespacedString(t *testing.T) {
t.Errorf("Incorrect return v %q != \"yo\" || ok %v != true", v, ok)
}
}
func TestNamespacedReset(t *testing.T) {
ldb, err := leveldb.Open(storage.NewMemStorage(), nil)
if err != nil {
t.Fatal(err)
}
n1 := NewNamespacedKV(ldb, "foo")
n1.PutString("test1", "yo1")
n1.PutString("test2", "yo2")
n1.PutString("test3", "yo3")
if v, ok := n1.String("test1"); v != "yo1" || !ok {
t.Errorf("Incorrect return v %q != \"yo1\" || ok %v != true", v, ok)
}
if v, ok := n1.String("test2"); v != "yo2" || !ok {
t.Errorf("Incorrect return v %q != \"yo2\" || ok %v != true", v, ok)
}
if v, ok := n1.String("test3"); v != "yo3" || !ok {
t.Errorf("Incorrect return v %q != \"yo3\" || ok %v != true", v, ok)
}
n1.Reset()
if v, ok := n1.String("test1"); v != "" || ok {
t.Errorf("Incorrect return v %q != \"\" || ok %v != false", v, ok)
}
if v, ok := n1.String("test2"); v != "" || ok {
t.Errorf("Incorrect return v %q != \"\" || ok %v != false", v, ok)
}
if v, ok := n1.String("test3"); v != "" || ok {
t.Errorf("Incorrect return v %q != \"\" || ok %v != false", v, ok)
}
}