wallet: new --offline option

It will avoid connecting to a daemon (so useful for cold signing
using a RPC wallet), and not perform DNS queries.

1 files changed, 9 insertions, 4 deletions

diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 39380c9df..094346293 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -1232,19 +1232,22 @@ namespace tools
     template<class t_request, class t_response>
     inline bool invoke_http_json(const boost::string_ref uri, const t_request& req, t_response& res, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "GET")
     {
-      boost::lock_guard<boost::mutex> lock(m_daemon_rpc_mutex);
+      if (m_offline) return false;
+      boost::lock_guard<boost::recursive_mutex> lock(m_daemon_rpc_mutex);
       return epee::net_utils::invoke_http_json(uri, req, res, m_http_client, timeout, http_method);
     }
     template<class t_request, class t_response>
     inline bool invoke_http_bin(const boost::string_ref uri, const t_request& req, t_response& res, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "GET")
     {
-      boost::lock_guard<boost::mutex> lock(m_daemon_rpc_mutex);
+      if (m_offline) return false;
+      boost::lock_guard<boost::recursive_mutex> lock(m_daemon_rpc_mutex);
       return epee::net_utils::invoke_http_bin(uri, req, res, m_http_client, timeout, http_method);
     }
     template<class t_request, class t_response>
     inline bool invoke_http_json_rpc(const boost::string_ref uri, const std::string& method_name, const t_request& req, t_response& res, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "GET", const std::string& req_id = "0")
     {
-      boost::lock_guard<boost::mutex> lock(m_daemon_rpc_mutex);
+      if (m_offline) return false;
+      boost::lock_guard<boost::recursive_mutex> lock(m_daemon_rpc_mutex);
       return epee::net_utils::invoke_http_json_rpc(uri, method_name, req, res, m_http_client, timeout, http_method, req_id);
     }
 
@@ -1291,6 +1294,7 @@ namespace tools
     uint64_t hash_m_transfers(int64_t transfer_height, crypto::hash &hash) const;
     void finish_rescan_bc_keep_key_images(uint64_t transfer_height, const crypto::hash &hash);
     void enable_dns(bool enable) { m_use_dns = enable; }
+    void set_offline(bool offline = true);
 
   private:
     /*!
@@ -1422,7 +1426,7 @@ namespace tools
 
     std::atomic<bool> m_run;
 
-    boost::mutex m_daemon_rpc_mutex;
+    boost::recursive_mutex m_daemon_rpc_mutex;
 
     bool m_trusted_daemon;
     i_wallet2_callback* m_callback;
@@ -1474,6 +1478,7 @@ namespace tools
     std::string m_device_derivation_path;
     uint64_t m_device_last_key_image_sync;
     bool m_use_dns;
+    bool m_offline;
 
     // Aux transaction data from device
     std::unordered_map<crypto::hash, std::string> m_tx_device;