wallet2_api: added Wallet::daemonBlockChainTargetHeight()

libwallet_api: Wallet::blockChainTargetHeight

Signed-off-by: Jacob Brydolf <jacob@brydolf.net>

src/wallet/api/wallet.cpp

@@ -441,6 +441,23 @@ uint64_t WalletImpl::daemonBlockChainHeight() const
     return result;
 }
 
+uint64_t WalletImpl::daemonBlockChainTargetHeight() const
+{
+    std::string err;
+    uint64_t result = m_wallet->get_daemon_blockchain_target_height(err);
+    if (!err.empty()) {
+        LOG_ERROR(__FUNCTION__ << ": " << err);
+        result = 0;
+        m_errorString = err;
+        m_status = Status_Error;
+
+    } else {
+        m_status = Status_Ok;
+        m_errorString = "";
+    }
+    return result;
+}
+
 bool WalletImpl::refresh()
 {
     clearStatus();

src/wallet/api/wallet.h

@@ -77,6 +77,7 @@ public:
     uint64_t unlockedBalance() const;
     uint64_t blockChainHeight() const;
     uint64_t daemonBlockChainHeight() const;
+    uint64_t daemonBlockChainTargetHeight() const;
     bool refresh();
     void refreshAsync();
     void setAutoRefreshInterval(int millis);

src/wallet/wallet2.cpp

@@ -4085,6 +4085,38 @@ uint64_t wallet2::get_daemon_blockchain_height(string &err)
   return res.height;
 }
 
+uint64_t wallet2::get_daemon_blockchain_target_height(string &err)
+{
+  epee::json_rpc::request<cryptonote::COMMAND_RPC_GET_INFO::request> req_t = AUTO_VAL_INIT(req_t);
+  epee::json_rpc::response<cryptonote::COMMAND_RPC_GET_INFO::response, std::string> resp_t = AUTO_VAL_INIT(resp_t);
+  m_daemon_rpc_mutex.lock();
+  req_t.jsonrpc = "2.0";
+  req_t.id = epee::serialization::storage_entry(0);
+  req_t.method = "get_info";
+  bool ok = net_utils::invoke_http_json_remote_command2(m_daemon_address + "/json_rpc", req_t, resp_t, m_http_client);
+  m_daemon_rpc_mutex.unlock();
+  if (ok)
+  {
+    if (resp_t.result.status == CORE_RPC_STATUS_BUSY)
+    {
+      err = "daemon is busy. Please try again later.";
+    }
+    else if (resp_t.result.status != CORE_RPC_STATUS_OK)
+    {
+      err = resp_t.result.status;
+    }
+    else // success, cleaning up error message
+    {
+      err = "";
+    }
+  }
+  else
+  {
+    err = "possibly lost connection to daemon";
+  }
+  return resp_t.result.target_height;
+}
+
 void wallet2::set_tx_note(const crypto::hash &txid, const std::string &note)
 {
   m_tx_notes[txid] = note;

src/wallet/wallet2.h

@@ -401,6 +401,7 @@ namespace tools
     std::string get_keys_file() const;
     std::string get_daemon_address() const;
     uint64_t get_daemon_blockchain_height(std::string& err);
+    uint64_t get_daemon_blockchain_target_height(std::string& err);
 
     std::vector<size_t> select_available_outputs_from_histogram(uint64_t count, bool atleast, bool unlocked, bool trusted_daemon);
     std::vector<size_t> select_available_outputs(const std::function<bool(const transfer_details &td)> &f);

src/wallet/wallet2_api.h

@@ -248,6 +248,12 @@ struct Wallet
      */
     virtual uint64_t daemonBlockChainHeight() const = 0;
 
+    /**
+     * @brief daemonBlockChainTargetHeight - returns daemon blockchain target height
+     * @return 0 - in case error communicating with the daemon.
+     *             status() will return Status_Error and errorString() will return verbose error description
+     */
+    virtual uint64_t daemonBlockChainTargetHeight() const = 0;
 
     static std::string displayAmount(uint64_t amount);
     static uint64_t amountFromString(const std::string &amount);