Pruning

The blockchain prunes seven eighths of prunable tx data.
This saves about two thirds of the blockchain size, while
keeping the node useful as a sync source for an eighth
of the blockchain.

No other data is currently pruned.

There are three ways to prune a blockchain:

- run monerod with --prune-blockchain
- run "prune_blockchain" in the monerod console
- run the monero-blockchain-prune utility

The first two will prune in place. Due to how LMDB works, this
will not reduce the blockchain size on disk. Instead, it will
mark parts of the file as free, so that future data will use
that free space, causing the file to not grow until free space
grows scarce.

The third way will create a second database, a pruned copy of
the original one. Since this is a new file, this one will be
smaller than the original one.

Once the database is pruned, it will stay pruned as it syncs.
That is, there is no need to use --prune-blockchain again, etc.

1 files changed, 22 insertions, 1 deletions

diff --git a/src/cryptonote_basic/connection_context.h b/src/cryptonote_basic/connection_context.h
index eb73ab0ea..112c13049 100644
--- a/src/cryptonote_basic/connection_context.h
+++ b/src/cryptonote_basic/connection_context.h
@@ -40,7 +40,7 @@ namespace cryptonote
   struct cryptonote_connection_context: public epee::net_utils::connection_context_base
   {
     cryptonote_connection_context(): m_state(state_before_handshake), m_remote_blockchain_height(0), m_last_response_height(0),
-        m_last_request_time(boost::posix_time::microsec_clock::universal_time()), m_callback_request_count(0), m_last_known_hash(crypto::null_hash) {}
+        m_last_request_time(boost::date_time::not_a_date_time), m_callback_request_count(0), m_last_known_hash(crypto::null_hash), m_pruning_seed(0), m_anchor(false) {}
 
     enum state
     {
@@ -59,6 +59,8 @@ namespace cryptonote
     boost::posix_time::ptime m_last_request_time;
     epee::copyable_atomic m_callback_request_count; //in debug purpose: problem with double callback rise
     crypto::hash m_last_known_hash;
+    uint32_t m_pruning_seed;
+    bool m_anchor;
     //size_t m_score;  TODO: add score calculations
   };
 
@@ -81,4 +83,23 @@ namespace cryptonote
     }    
   }
 
+  inline char get_protocol_state_char(cryptonote_connection_context::state s)
+  {
+    switch (s)
+    {
+    case cryptonote_connection_context::state_before_handshake:
+      return 'h';
+    case cryptonote_connection_context::state_synchronizing:
+      return 's';
+    case cryptonote_connection_context::state_standby:
+      return 'w';
+    case cryptonote_connection_context::state_idle:
+      return 'i';
+    case cryptonote_connection_context::state_normal:
+      return 'n';
+    default:
+      return 'u';
+    }
+  }
+
 }