Allow the wallet to access hard fork information

And make it change behavior slightly when close/after first hard fork

src/cryptonote_core/blockchain.cpp

@@ -3173,9 +3173,9 @@ HardFork::State Blockchain::get_hard_fork_state() const
   return m_hardfork->get_state();
 }
 
-bool Blockchain::get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const
+bool Blockchain::get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const
 {
-  return m_hardfork->get_voting_info(version, window, votes, threshold, voting);
+  return m_hardfork->get_voting_info(version, window, votes, threshold, earliest_height, voting);
 }
 
 bool Blockchain::for_all_key_images(std::function<bool(const crypto::key_image&)> f) const

src/cryptonote_core/blockchain.h

@@ -162,7 +162,7 @@ namespace cryptonote
     uint8_t get_ideal_hard_fork_version() const { return m_hardfork->get_ideal_version(); }
     uint8_t get_ideal_hard_fork_version(uint64_t height) const { return m_hardfork->get_ideal_version(height); }
 
-    bool get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const;
+    bool get_hard_fork_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const;
 
     bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const;
     bool for_all_blocks(std::function<bool(uint64_t, const crypto::hash&, const block&)>) const;

src/cryptonote_core/hardfork.cpp

@@ -355,7 +355,16 @@ uint8_t HardFork::get_ideal_version(uint64_t height) const
   return original_version;
 }
 
-bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const
+uint64_t HardFork::get_earliest_ideal_height_for_version(uint8_t version) const
+{
+  for (unsigned int n = heights.size() - 1; n > 0; --n) {
+    if (heights[n].version <= version)
+      return heights[n].height;
+  }
+  return 0;
+}
+
+bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const
 {
   CRITICAL_REGION_LOCAL(lock);
 
@@ -367,6 +376,7 @@ bool HardFork::get_voting_info(uint8_t version, uint32_t &window, uint32_t &vote
       votes += last_versions[n];
   threshold = (window * heights[current_version].threshold + 99) / 100;
   assert((votes >= threshold) == enabled);
+  earliest_height = get_earliest_ideal_height_for_version(version);
   voting = heights.back().version;
   return enabled;
 }

src/cryptonote_core/hardfork.h

@@ -183,6 +183,11 @@ namespace cryptonote
      */
     uint8_t get_current_version() const;
 
+    /**
+     * @brief returns the earliest block a given version may activate
+     */
+    uint64_t get_earliest_ideal_height_for_version(uint8_t version) const;
+
     /**
      * @brief returns information about current voting state
      *
@@ -193,8 +198,9 @@ namespace cryptonote
      * @param window the number of blocks considered in voting
      * @param votes number of votes for next version
      * @param threshold number of votes needed to switch to next version
+     * @param earliest_height earliest height at which the version can take effect
      */
-    bool get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint8_t &voting) const;
+    bool get_voting_info(uint8_t version, uint32_t &window, uint32_t &votes, uint32_t &threshold, uint64_t &earliest_height, uint8_t &voting) const;
 
     /**
      * @brief returns the size of the voting window in blocks

src/rpc/core_rpc_server.cpp

@@ -890,7 +890,7 @@ namespace cryptonote
     const Blockchain &blockchain = m_core.get_blockchain_storage();
     uint8_t version = req.version > 0 ? req.version : blockchain.get_ideal_hard_fork_version();
     res.version = blockchain.get_current_hard_fork_version();
-    res.enabled = blockchain.get_hard_fork_voting_info(version, res.window, res.votes, res.threshold, res.voting);
+    res.enabled = blockchain.get_hard_fork_voting_info(version, res.window, res.votes, res.threshold, res.earliest_height, res.voting);
     res.state = blockchain.get_hard_fork_state();
     res.status = CORE_RPC_STATUS_OK;
     return true;

src/rpc/core_rpc_server_commands_defs.h

@@ -875,6 +875,7 @@ namespace cryptonote
       uint32_t threshold;
       uint8_t voting;
       uint32_t state;
+      uint64_t earliest_height;
       std::string status;
 
       BEGIN_KV_SERIALIZE_MAP()
@@ -885,6 +886,7 @@ namespace cryptonote
         KV_SERIALIZE(threshold)
         KV_SERIALIZE(voting)
         KV_SERIALIZE(state)
+        KV_SERIALIZE(earliest_height)
         KV_SERIALIZE(status)
       END_KV_SERIALIZE_MAP()
     };

src/wallet/wallet2.cpp

@@ -2338,10 +2338,45 @@ void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t n
   ptx.dests = dsts;
 }
 
+//----------------------------------------------------------------------------------------------------
+bool wallet2::use_fork_rules(uint8_t version)
+{
+  cryptonote::COMMAND_RPC_GET_HEIGHT::request req = AUTO_VAL_INIT(req);
+  cryptonote::COMMAND_RPC_GET_HEIGHT::response res = AUTO_VAL_INIT(res);
+  epee::json_rpc::request<cryptonote::COMMAND_RPC_HARD_FORK_INFO::request> req_t = AUTO_VAL_INIT(req_t);
+  epee::json_rpc::response<cryptonote::COMMAND_RPC_HARD_FORK_INFO::response, std::string> resp_t = AUTO_VAL_INIT(resp_t);
+
+  m_daemon_rpc_mutex.lock();
+  bool r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/getheight", req, res, m_http_client);
+  m_daemon_rpc_mutex.unlock();
+  CHECK_AND_ASSERT_MES(r, false, "Failed to connect to daemon");
+  CHECK_AND_ASSERT_MES(res.status != CORE_RPC_STATUS_BUSY, false, "Failed to connect to daemon");
+  CHECK_AND_ASSERT_MES(res.status == CORE_RPC_STATUS_OK, false, "Failed to get current blockchain height");
+
+  m_daemon_rpc_mutex.lock();
+  req_t.jsonrpc = "2.0";
+  req_t.id = epee::serialization::storage_entry(0);
+  req_t.method = "hard_fork_info";
+  req_t.params.version = version;
+  r = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/json_rpc", req_t, resp_t, m_http_client);
+  m_daemon_rpc_mutex.unlock();
+  CHECK_AND_ASSERT_MES(r, false, "Failed to connect to daemon");
+  CHECK_AND_ASSERT_MES(res.status != CORE_RPC_STATUS_BUSY, false, "Failed to connect to daemon");
+  CHECK_AND_ASSERT_MES(res.status == CORE_RPC_STATUS_OK, false, "Failed to get hard fork status");
+
+  bool close_enough = res.height >=  resp_t.result.earliest_height - 10; // start using the rules a bit beforehand
+  if (close_enough)
+    LOG_PRINT_L2("Using HF1 rules");
+  else
+    LOG_PRINT_L2("Not using HF1 rules");
+  return close_enough;
+}
 //----------------------------------------------------------------------------------------------------
 std::vector<wallet2::pending_tx> wallet2::create_dust_sweep_transactions()
 {
-  tx_dust_policy dust_policy(::config::DEFAULT_DUST_THRESHOLD);
+  // From hard fork 1, we don't consider small amounts to be dust anymore
+  const bool hf1_rules = use_fork_rules(2); // first hard fork has version 2
+  tx_dust_policy dust_policy(hf1_rules ? 0 : ::config::DEFAULT_DUST_THRESHOLD);
 
   size_t num_dust_outputs = 0;
   for (transfer_container::const_iterator i = m_transfers.begin(); i != m_transfers.end(); ++i)

src/wallet/wallet2.h

@@ -372,6 +372,7 @@ namespace tools
     crypto::hash get_payment_id(const pending_tx &ptx) const;
     void check_acc_out(const cryptonote::account_keys &acc, const cryptonote::tx_out &o, const crypto::public_key &tx_pub_key, size_t i, uint64_t &money_transfered, bool &error) const;
     void parse_block_round(const cryptonote::blobdata &blob, cryptonote::block &bl, crypto::hash &bl_id, bool &error) const;
+    bool use_fork_rules(uint8_t version);
 
     cryptonote::account_base m_account;
     std::string m_daemon_address;
@@ -552,7 +553,8 @@ namespace tools
     // randomly select inputs for transaction
     // throw if requested send amount is greater than amount available to send
     std::list<transfer_container::iterator> selected_transfers;
-    uint64_t found_money = select_transfers(needed_money, 0 == fake_outputs_count, dust_policy.dust_threshold, selected_transfers);
+    const bool add_dust = (0 == fake_outputs_count) && !use_fork_rules(2); // first fork has version 2
+    uint64_t found_money = select_transfers(needed_money, add_dust, dust_policy.dust_threshold, selected_transfers);
     THROW_WALLET_EXCEPTION_IF(found_money < needed_money, error::not_enough_money, found_money, needed_money - fee, fee);
 
     typedef COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::out_entry out_entry;