From 75a76e36199eba228856d59318cb54ca64ca6b57 Mon Sep 17 00:00:00 2001
From: Jim Posen <jim.posen@gmail.com>
Date: Mon, 27 Aug 2018 17:01:24 -0700
Subject: index: Implement block filter index with write operations.

---
 src/index/blockfilterindex.h | 53 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/index/blockfilterindex.h

(limited to 'src/index/blockfilterindex.h')

diff --git a/src/index/blockfilterindex.h b/src/index/blockfilterindex.h
new file mode 100644
index 0000000000..d2dd3a27bc
--- /dev/null
+++ b/src/index/blockfilterindex.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_INDEX_BLOCKFILTERINDEX_H
+#define BITCOIN_INDEX_BLOCKFILTERINDEX_H
+
+#include <blockfilter.h>
+#include <chain.h>
+#include <flatfile.h>
+#include <index/base.h>
+
+/**
+ * BlockFilterIndex is used to store and retrieve block filters, hashes, and headers for a range of
+ * blocks by height. An index is constructed for each supported filter type with its own database
+ * (ie. filter data for different types are stored in separate databases).
+ *
+ * This index is used to serve BIP 157 net requests.
+ */
+class BlockFilterIndex final : public BaseIndex
+{
+private:
+    BlockFilterType m_filter_type;
+    std::string m_name;
+    std::unique_ptr<BaseIndex::DB> m_db;
+
+    FlatFilePos m_next_filter_pos;
+    std::unique_ptr<FlatFileSeq> m_filter_fileseq;
+
+    size_t WriteFilterToDisk(FlatFilePos& pos, const BlockFilter& filter);
+
+protected:
+    bool Init() override;
+
+    bool CommitInternal(CDBBatch& batch) override;
+
+    bool WriteBlock(const CBlock& block, const CBlockIndex* pindex) override;
+
+    bool Rewind(const CBlockIndex* current_tip, const CBlockIndex* new_tip) override;
+
+    BaseIndex::DB& GetDB() const override { return *m_db; }
+
+    const char* GetName() const override { return m_name.c_str(); }
+
+public:
+    /** Constructs the index, which becomes available to be queried. */
+    explicit BlockFilterIndex(BlockFilterType filter_type,
+                              size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
+
+    BlockFilterType GetFilterType() const { return m_filter_type; }
+};
+
+#endif // BITCOIN_INDEX_BLOCKFILTERINDEX_H
-- 
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