58 lines
2 KiB
Go
58 lines
2 KiB
Go
// Copyright (c) 2015-2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package ffldb
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import (
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"github.com/btcsuite/goleveldb/leveldb/iterator"
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"github.com/btcsuite/goleveldb/leveldb/util"
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"github.com/lbryio/lbcd/database/internal/treap"
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)
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// ldbTreapIter wraps a treap iterator to provide the additional functionality
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// needed to satisfy the leveldb iterator.Iterator interface.
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type ldbTreapIter struct {
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*treap.Iterator
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tx *transaction
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released bool
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}
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// Enforce ldbTreapIter implements the leveldb iterator.Iterator interface.
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var _ iterator.Iterator = (*ldbTreapIter)(nil)
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// Error is only provided to satisfy the iterator interface as there are no
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// errors for this memory-only structure.
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//
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// This is part of the leveldb iterator.Iterator interface implementation.
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func (iter *ldbTreapIter) Error() error {
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return nil
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}
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// SetReleaser is only provided to satisfy the iterator interface as there is no
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// need to override it.
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//
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// This is part of the leveldb iterator.Iterator interface implementation.
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func (iter *ldbTreapIter) SetReleaser(releaser util.Releaser) {
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}
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// Release releases the iterator by removing the underlying treap iterator from
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// the list of active iterators against the pending keys treap.
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//
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// This is part of the leveldb iterator.Iterator interface implementation.
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func (iter *ldbTreapIter) Release() {
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if !iter.released {
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iter.tx.removeActiveIter(iter.Iterator)
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iter.released = true
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}
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}
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// newLdbTreapIter creates a new treap iterator for the given slice against the
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// pending keys for the passed transaction and returns it wrapped in an
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// ldbTreapIter so it can be used as a leveldb iterator. It also adds the new
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// iterator to the list of active iterators for the transaction.
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func newLdbTreapIter(tx *transaction, slice *util.Range) *ldbTreapIter {
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iter := tx.pendingKeys.Iterator(slice.Start, slice.Limit)
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tx.addActiveIter(iter)
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return &ldbTreapIter{Iterator: iter, tx: tx}
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}
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