wallet: add a --generate-from-json flag

It takes a filename containing JSON data to generate a wallet.
The following fields are valid:

  version: integer, should be 1
  filename: string, path/filename for the newly created wallet
  scan_from_height: 64 bit unsigned integer, optional
  password: string, optional
  viewkey: string, hex representation
  spendkey: string, hex representation
  seed: string, optional, list of words separated by spaces

Either seed or private keys should be given. If using private
keys, the spend key may be omitted (the wallet will not be
able to spend, but will see incoming transactions).

If scan_from_height is given, blocks below this height will not
be checked for transactions as an optimization.

2 files changed, 10 insertions, 4 deletions

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 2afe08cb1..1c7187cf0 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -490,7 +490,7 @@ void wallet2::process_new_blockchain_entry(const cryptonote::block& b, const cry
   //handle transactions from new block
     
   //optimization: seeking only for blocks that are not older then the wallet creation time plus 1 day. 1 day is for possible user incorrect time setup
-  if(b.timestamp + 60*60*24 > m_account.get_createtime())
+  if(b.timestamp + 60*60*24 > m_account.get_createtime() && height >= m_refresh_from_block_height)
   {
     TIME_MEASURE_START(miner_tx_handle_time);
     process_new_transaction(b.miner_tx, height, true);
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index f798f404d..e7b002925 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -88,10 +88,10 @@ namespace tools
     };
 
   private:
-    wallet2(const wallet2&) : m_run(true), m_callback(0), m_testnet(false), m_always_confirm_transfers (false), m_store_tx_info(true), m_default_mixin(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true) {}
+    wallet2(const wallet2&) : m_run(true), m_callback(0), m_testnet(false), m_always_confirm_transfers (false), m_store_tx_info(true), m_default_mixin(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true), m_refresh_from_block_height(0) {}
 
   public:
-    wallet2(bool testnet = false, bool restricted = false) : m_run(true), m_callback(0), m_testnet(testnet), m_restricted(restricted), is_old_file_format(false), m_store_tx_info(true), m_default_mixin(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true) {}
+    wallet2(bool testnet = false, bool restricted = false) : m_run(true), m_callback(0), m_testnet(testnet), m_restricted(restricted), is_old_file_format(false), m_store_tx_info(true), m_default_mixin(0), m_refresh_type(RefreshOptimizeCoinbase), m_auto_refresh(true), m_refresh_from_block_height(0) {}
     struct transfer_details
     {
       uint64_t m_block_height;
@@ -226,6 +226,8 @@ namespace tools
     cryptonote::account_base& get_account(){return m_account;}
     const cryptonote::account_base& get_account()const{return m_account;}
 
+    void set_refresh_from_block_height(uint64_t height) {m_refresh_from_block_height = height;}
+
     // upper_transaction_size_limit as defined below is set to 
     // approximately 125% of the fixed minimum allowable penalty
     // free block size. TODO: fix this so that it actually takes
@@ -319,6 +321,9 @@ namespace tools
       if(ver < 9)
         return;
       a & m_confirmed_txs;
+      if(ver < 11)
+        return;
+      a & m_refresh_from_block_height;
     }
 
     /*!
@@ -430,9 +435,10 @@ namespace tools
     uint32_t m_default_mixin;
     RefreshType m_refresh_type;
     bool m_auto_refresh;
+    uint64_t m_refresh_from_block_height;
   };
 }
-BOOST_CLASS_VERSION(tools::wallet2, 10)
+BOOST_CLASS_VERSION(tools::wallet2, 11)
 BOOST_CLASS_VERSION(tools::wallet2::payment_details, 0)
 BOOST_CLASS_VERSION(tools::wallet2::unconfirmed_transfer_details, 2)
 BOOST_CLASS_VERSION(tools::wallet2::confirmed_transfer_details, 1)