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Allow block announcements with headers

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This replaces using inv messages to announce new blocks, when a peer requests
(via the new "sendheaders" message) that blocks be announced with headers
instead of inv's.

Since headers-first was introduced, peers send getheaders messages in response
to an inv, which requires generating a block locator that is large compared to
the size of the header being requested, and requires an extra round-trip before
a reorg can be relayed.  Save time by tracking headers that a peer is likely to
know about, and send a headers chain that would connect to a peer's known
headers, unless the chain would be too big, in which case we revert to sending
an inv instead.

Based off of @sipa's commit to announce all blocks in a reorg via inv,
which has been squashed into this commit.

Rebased-by: Pieter Wuille
This commit is contained in:
Suhas Daftuar
2014-11-18 22:16:32 +01:00
committed by Pieter Wuille
parent c894fbbb1d
commit 50262d8953
8 changed files with 781 additions and 14 deletions
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5
src/version.h
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@@ -9,7 +9,7 @@
* network protocol versioning
*/
static const int PROTOCOL_VERSION = 70011;
static const int PROTOCOL_VERSION = 70012;
//! initial proto version, to be increased after version/verack negotiation
static const int INIT_PROTO_VERSION = 209;
@@ -37,4 +37,7 @@ static const int MEMPOOL_GD_VERSION = 60002;
//! "filter*" commands are disabled without NODE_BLOOM after and including this version
static const int NO_BLOOM_VERSION = 70011;
//! "sendheaders" command and announcing blocks with headers starts with this version
static const int SENDHEADERS_VERSION = 70012;
#endif // BITCOIN_VERSION_H