New canonical Iterator

db/db.go

@@ -1,93 +1,5 @@
 package db
 
-import . "github.com/tendermint/tmlibs/common"
-
-type DB interface {
-	Get([]byte) []byte // NOTE: returns nil iff never set or deleted.
-	Set([]byte, []byte)
-	SetSync([]byte, []byte)
-	Delete([]byte)
-	DeleteSync([]byte)
-	Close()
-	NewBatch() Batch
-	Iterator() Iterator
-
-	// For debugging
-	Print()
-
-	// Stats returns a map of property values for all keys and the size of the cache.
-	Stats() map[string]string
-
-	// CacheDB wraps the DB w/ a cache.
-	CacheDB() CacheDB
-}
-
-type CacheDB interface {
-	DB
-	Write() // Write to the underlying DB
-}
-
-type SetDeleter interface {
-	Set(key, value []byte)
-	Delete(key []byte)
-}
-
-type Batch interface {
-	SetDeleter
-	Write()
-}
-
-/*
-	Usage:
-
-	for itr.Seek(mykey); itr.Valid(); itr.Next() {
-		k, v := itr.Key(); itr.Value()
-		....
-	}
-*/
-type Iterator interface {
-
-	// Seek moves the iterator the position of the key given or, if the key
-	// doesn't exist, the next key that does exist in the database. If the key
-	// doesn't exist, and there is no next key, the Iterator becomes invalid.
-	Seek(key []byte)
-
-	// Valid returns false only when an Iterator has iterated past either the
-	// first or the last key in the database.
-	Valid() bool
-
-	// Next moves the iterator to the next sequential key in the database, as
-	// defined by the Comparator in the ReadOptions used to create this Iterator.
-	//
-	// If Valid returns false, this method will panic.
-	Next()
-
-	// Prev moves the iterator to the previous sequential key in the database, as
-	// defined by the Comparator in the ReadOptions used to create this Iterator.
-	//
-	// If Valid returns false, this method will panic.
-	Prev()
-
-	// Key returns the key of the cursor.
-	//
-	// If Valid returns false, this method will panic.
-	Key() []byte
-
-	// Value returns the key of the cursor.
-	//
-	// If Valid returns false, this method will panic.
-	Value() []byte
-
-	// GetError returns an IteratorError from LevelDB if it had one during
-	// iteration.
-	//
-	// This method is safe to call when Valid returns false.
-	GetError() error
-
-	// Close deallocates the given Iterator.
-	Close()
-}
-
 //-----------------------------------------------------------------------------
 // Main entry