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authorWladimir J. van der Laan <laanwj@gmail.com>2016-03-28 18:18:30 +0200
committerWladimir J. van der Laan <laanwj@gmail.com>2016-04-15 16:33:05 +0200
commit509cb006d514cece5ab7680094f033c8dc8a2318 (patch)
treef14b1a13f7613a592d2489616c48f71c734ee2d3 /src/coins.h
parent1b2460bd5824170ab85757e35f81197199cce9d6 (diff)
txdb: Add Cursor() method to CCoinsView to iterate over UTXO set
Add a method Cursor() to CCoinsView that returns a cursor which can be used to iterate over the whole UTXO set. - rpc: Change gettxoutsetinfo to use new Cursor method - txdb: Remove GetStats method - Now that GetStats is implemented in terms of Cursor, remove it.
Diffstat (limited to 'src/coins.h')
-rw-r--r--src/coins.h33
1 files changed, 20 insertions, 13 deletions
diff --git a/src/coins.h b/src/coins.h
index d297cae1aa..d72f885473 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -297,19 +297,26 @@ struct CCoinsCacheEntry
typedef boost::unordered_map<uint256, CCoinsCacheEntry, CCoinsKeyHasher> CCoinsMap;
-struct CCoinsStats
+/** Cursor for iterating over CoinsView state */
+class CCoinsViewCursor
{
- int nHeight;
- uint256 hashBlock;
- uint64_t nTransactions;
- uint64_t nTransactionOutputs;
- uint64_t nSerializedSize;
- uint256 hashSerialized;
- CAmount nTotalAmount;
+public:
+ CCoinsViewCursor(const uint256 &hashBlockIn): hashBlock(hashBlockIn) {}
+ virtual ~CCoinsViewCursor();
- CCoinsStats() : nHeight(0), nTransactions(0), nTransactionOutputs(0), nSerializedSize(0), nTotalAmount(0) {}
-};
+ virtual bool GetKey(uint256 &key) const = 0;
+ virtual bool GetValue(CCoins &coins) const = 0;
+ /* Don't care about GetKeySize here */
+ virtual unsigned int GetValueSize() const = 0;
+ virtual bool Valid() const = 0;
+ virtual void Next() = 0;
+
+ //! Get best block at the time this cursor was created
+ const uint256 &GetBestBlock() const { return hashBlock; }
+private:
+ uint256 hashBlock;
+};
/** Abstract view on the open txout dataset. */
class CCoinsView
@@ -329,8 +336,8 @@ public:
//! The passed mapCoins can be modified.
virtual bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
- //! Calculate statistics about the unspent transaction output set
- virtual bool GetStats(CCoinsStats &stats) const;
+ //! Get a cursor to iterate over the whole state
+ virtual CCoinsViewCursor *Cursor() const;
//! As we use CCoinsViews polymorphically, have a virtual destructor
virtual ~CCoinsView() {}
@@ -350,7 +357,7 @@ public:
uint256 GetBestBlock() const;
void SetBackend(CCoinsView &viewIn);
bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
- bool GetStats(CCoinsStats &stats) const;
+ CCoinsViewCursor *Cursor() const;
};