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authorPieter Wuille <pieter.wuille@gmail.com>2014-07-12 00:02:35 +0200
committerPieter Wuille <pieter.wuille@gmail.com>2014-10-14 15:42:01 -0700
commit341735eb8f42e898cf9d4d130709471e5d01abe2 (patch)
tree7986b1d3056a776e3423d75353b3282a99edbd44 /src/main.h
parent992ab87114b8c9ea8230e97a9c8d8bd71939074d (diff)
Headers-first synchronization
Many changes: * Do not use 'getblocks', but 'getheaders', and use it to build a headers tree. * Blocks are fetched in parallel from all available outbound peers, using a limited moving window. When one peer stalls the movement of the window, it is disconnected. * No more orphan blocks. At all. We only ever request a block for which we have verified the headers, and store it to disk immediately. This means that a disk-fill attack would require PoW. * Require protocol version 31800 for every peer (released in december 2010). * No more syncnode (we sync from everyone we can, though limited to 1 during initial *headers* sync). * Introduce some extra named constants, comments and asserts.
Diffstat (limited to 'src/main.h')
-rw-r--r--src/main.h21
1 files changed, 12 insertions, 9 deletions
diff --git a/src/main.h b/src/main.h
index cad7eebfb7..674f2fe4a4 100644
--- a/src/main.h
+++ b/src/main.h
@@ -72,9 +72,17 @@ static const int MAX_SCRIPTCHECK_THREADS = 16;
/** -par default (number of script-checking threads, 0 = auto) */
static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
/** Number of blocks that can be requested at any given time from a single peer. */
-static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 128;
-/** Timeout in seconds before considering a block download peer unresponsive. */
-static const unsigned int BLOCK_DOWNLOAD_TIMEOUT = 60;
+static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
+/** Timeout in seconds during which a peer must stall block download progress before being disconnected. */
+static const unsigned int BLOCK_STALLING_TIMEOUT = 2;
+/** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends
+ * less than this number, we reached their tip. Changing this value is a protocol upgrade. */
+static const unsigned int MAX_HEADERS_RESULTS = 2000;
+/** Size of the "block download window": how far ahead of our current height do we fetch?
+ * Larger windows tolerate larger download speed differences between peer, but increase the potential
+ * degree of disordering of blocks on disk (which make reindexing and in the future perhaps pruning
+ * harder). We'll probably want to make this a per-peer adaptive value at some point. */
+static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
/** "reject" message codes **/
static const unsigned char REJECT_MALFORMED = 0x01;
@@ -137,8 +145,6 @@ void RegisterNodeSignals(CNodeSignals& nodeSignals);
/** Unregister a network node */
void UnregisterNodeSignals(CNodeSignals& nodeSignals);
-void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd);
-
/** Process an incoming block */
bool ProcessBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp = NULL);
/** Check whether enough disk space is available for an incoming block */
@@ -439,9 +445,6 @@ bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex
// Apply the effects of this block (with given index) on the UTXO set represented by coins
bool ConnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& coins, bool fJustCheck = false);
-// Add this block to the block index, and if necessary, switch the active block chain to this
-bool AddToBlockIndex(CBlock& block, CValidationState& state, const CDiskBlockPos& pos);
-
// Context-independent validity checks
bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool fCheckPOW = true);
bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
@@ -449,7 +452,7 @@ bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW = t
// Store block on disk
// if dbp is provided, the file is known to already reside on disk
bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex **pindex, CDiskBlockPos* dbp = NULL);
-bool AcceptBlockHeader(CBlockHeader& block, CValidationState& state, CBlockIndex **ppindex= NULL);
+bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex **ppindex= NULL);