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Headers-first synchronization

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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.
This commit is contained in:
Pieter Wuille
2014-07-12 00:02:35 +02:00
parent 992ab87114
commit 341735eb8f
9 changed files with 375 additions and 370 deletions
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5
src/version.h
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@@ -33,8 +33,11 @@ static const int PROTOCOL_VERSION = 70002;
// initial proto version, to be increased after version/verack negotiation
static const int INIT_PROTO_VERSION = 209;
// In this version, 'getheaders' was introduced.
static const int GETHEADERS_VERSION = 31800;
// disconnect from peers older than this proto version
static const int MIN_PEER_PROTO_VERSION = 209;
static const int MIN_PEER_PROTO_VERSION = GETHEADERS_VERSION;
// nTime field added to CAddress, starting with this version;
// if possible, avoid requesting addresses nodes older than this