daemon/rpc: updates command and RPC

subcommands "check", "download", and "update".
update is not yet implemented.

src/daemon/command_parser_executor.cpp

@@ -552,4 +552,15 @@ bool t_command_parser_executor::print_blockchain_dynamic_stats(const std::vector
   return m_executor.print_blockchain_dynamic_stats(nblocks);
 }
 
+bool t_command_parser_executor::update(const std::vector<std::string>& args)
+{
+  if(args.size() != 1)
+  {
+    std::cout << "Exactly one parameter is needed: check, download, or update" << std::endl;
+    return false;
+  }
+
+  return m_executor.update(args.front());
+}
+
 } // namespace daemonize

src/daemon/command_parser_executor.h

@@ -130,6 +130,8 @@ public:
   bool alt_chain_info(const std::vector<std::string>& args);
 
   bool print_blockchain_dynamic_stats(const std::vector<std::string>& args);
+
+  bool update(const std::vector<std::string>& args);
 };
 
 } // namespace daemonize

src/daemon/command_server.cpp

@@ -243,6 +243,11 @@ t_command_server::t_command_server(
     , std::bind(&t_command_parser_executor::print_blockchain_dynamic_stats, &m_parser, p::_1)
     , "Print information about current blockchain dynamic state"
     );
+    m_command_lookup.set_handler(
+      "update"
+    , std::bind(&t_command_parser_executor::update, &m_parser, p::_1)
+    , "subcommands: check (check if an update is available), download (download it is there is), update (not implemented)"
+    );
 }
 
 bool t_command_server::process_command_str(const std::string& cmd)

src/daemon/rpc_command_executor.cpp

@@ -1580,4 +1580,51 @@ bool t_rpc_command_executor::print_blockchain_dynamic_stats(uint64_t nblocks)
   return true;
 }
 
+bool t_rpc_command_executor::update(const std::string &command)
+{
+  cryptonote::COMMAND_RPC_UPDATE::request req;
+  cryptonote::COMMAND_RPC_UPDATE::response res;
+  epee::json_rpc::error error_resp;
+
+  std::string fail_message = "Problem fetching info";
+
+  req.command = command;
+  if (m_is_rpc)
+  {
+    if (!m_rpc_client->rpc_request(req, res, "/update", fail_message.c_str()))
+    {
+      return true;
+    }
+  }
+  else
+  {
+    if (!m_rpc_server->on_update(req, res) || res.status != CORE_RPC_STATUS_OK)
+    {
+      tools::fail_msg_writer() << fail_message.c_str();
+      return true;
+    }
+  }
+
+  if (!res.update)
+  {
+    tools::msg_writer() << "No update available";
+    return true;
+  }
+
+  tools::msg_writer() << "Update available: v" << res.version << ": " << res.user_uri << ", hash " << res.hash;
+  if (command == "check")
+    return true;
+
+  if (!res.path.empty())
+    tools::msg_writer() << "Update downloaded to: " << res.path;
+  else
+    tools::msg_writer() << "Update download failed: " << res.status;
+  if (command == "download")
+    return true;
+
+  tools::msg_writer() << "'update' not implemented yet";
+
+  return true;
+}
+
 }// namespace daemonize

src/daemon/rpc_command_executor.h

@@ -151,6 +151,8 @@ public:
   bool alt_chain_info();
 
   bool print_blockchain_dynamic_stats(uint64_t nblocks);
+
+  bool update(const std::string &command);
 };
 
 } // namespace daemonize

src/rpc/core_rpc_server.cpp

@@ -33,6 +33,9 @@ using namespace epee;
 
 #include "core_rpc_server.h"
 #include "common/command_line.h"
+#include "common/updates.h"
+#include "common/download.h"
+#include "common/util.h"
 #include "cryptonote_basic/cryptonote_format_utils.h"
 #include "cryptonote_basic/account.h"
 #include "cryptonote_basic/cryptonote_basic_impl.h"
@@ -1455,6 +1458,98 @@ namespace cryptonote
 	  return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool core_rpc_server::on_update(const COMMAND_RPC_UPDATE::request& req, COMMAND_RPC_UPDATE::response& res)
+  {
+    static const char software[] = "monero";
+#ifdef BUILDTAG
+    static const char buildtag[] = BOOST_PP_STRINGIZE(BUILDTAG);
+#else
+    static const char buildtag[] = "source";
+#endif
+
+    if (req.command != "check" && req.command != "download" && req.command != "update")
+    {
+      res.status = std::string("unknown command: '") + req.command + "'";
+      return true;
+    }
+
+    std::string version, hash;
+    if (!tools::check_updates(software, buildtag, version, hash))
+    {
+      res.status = "Error checking for updates";
+      return true;
+    }
+    if (tools::vercmp(version.c_str(), MONERO_VERSION) <= 0)
+    {
+      res.update = false;
+      res.status = CORE_RPC_STATUS_OK;
+      return true;
+    }
+    res.update = true;
+    res.version = version;
+    res.user_uri = tools::get_update_url(software, "cli", buildtag, version, true);
+    res.auto_uri = tools::get_update_url(software, "cli", buildtag, version, false);
+    res.hash = hash;
+    if (req.command == "check")
+    {
+      res.status = CORE_RPC_STATUS_OK;
+      return true;
+    }
+
+    boost::filesystem::path path;
+    if (req.path.empty())
+    {
+      std::string filename;
+      const char *slash = strrchr(res.auto_uri.c_str(), '/');
+      if (slash)
+        filename = slash + 1;
+      else
+        filename = std::string(software) + "-update-" + version;
+      path = epee::string_tools::get_current_module_folder();
+      path /= filename;
+    }
+    else
+    {
+      path = req.path;
+    }
+
+    crypto::hash file_hash;
+    if (!tools::sha256sum(path.string(), file_hash) || (hash != epee::string_tools::pod_to_hex(file_hash)))
+    {
+      MDEBUG("We don't have that file already, downloading");
+      if (!tools::download(path.string(), res.auto_uri))
+      {
+        MERROR("Failed to download " << res.auto_uri);
+        return false;
+      }
+      if (!tools::sha256sum(path.string(), file_hash))
+      {
+        MERROR("Failed to hash " << path);
+        return false;
+      }
+      if (hash != epee::string_tools::pod_to_hex(file_hash))
+      {
+        MERROR("Download from " << res.auto_uri << " does not match the expected hash");
+        return false;
+      }
+      MINFO("New version downloaded to " << path);
+    }
+    else
+    {
+      MDEBUG("We already have " << path << " with expected hash");
+    }
+    res.path = path.string();
+
+    if (req.command == "download")
+    {
+      res.status = CORE_RPC_STATUS_OK;
+      return true;
+    }
+
+    res.status = "'update' not implemented yet";
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
 
   const command_line::arg_descriptor<std::string> core_rpc_server::arg_rpc_bind_port = {
       "rpc-bind-port"

src/rpc/core_rpc_server.h

@@ -98,6 +98,7 @@ namespace cryptonote
       MAP_URI_AUTO_JON2_IF("/start_save_graph", on_start_save_graph, COMMAND_RPC_START_SAVE_GRAPH, !m_restricted)
       MAP_URI_AUTO_JON2_IF("/stop_save_graph", on_stop_save_graph, COMMAND_RPC_STOP_SAVE_GRAPH, !m_restricted)
       MAP_URI_AUTO_JON2("/get_outs", on_get_outs, COMMAND_RPC_GET_OUTPUTS)      
+      MAP_URI_AUTO_JON2_IF("/update", on_update, COMMAND_RPC_UPDATE, !m_restricted)
       BEGIN_JSON_RPC_MAP("/json_rpc")
         MAP_JON_RPC("getblockcount",             on_getblockcount,              COMMAND_RPC_GETBLOCKCOUNT)
         MAP_JON_RPC_WE("on_getblockhash",        on_getblockhash,               COMMAND_RPC_GETBLOCKHASH)
@@ -148,6 +149,7 @@ namespace cryptonote
     bool on_out_peers(const COMMAND_RPC_OUT_PEERS::request& req, COMMAND_RPC_OUT_PEERS::response& res);
     bool on_start_save_graph(const COMMAND_RPC_START_SAVE_GRAPH::request& req, COMMAND_RPC_START_SAVE_GRAPH::response& res);
     bool on_stop_save_graph(const COMMAND_RPC_STOP_SAVE_GRAPH::request& req, COMMAND_RPC_STOP_SAVE_GRAPH::response& res);
+    bool on_update(const COMMAND_RPC_UPDATE::request& req, COMMAND_RPC_UPDATE::response& res);
     
     //json_rpc
     bool on_getblockcount(const COMMAND_RPC_GETBLOCKCOUNT::request& req, COMMAND_RPC_GETBLOCKCOUNT::response& res);

src/rpc/core_rpc_server_commands_defs.h

@@ -1438,4 +1438,39 @@ namespace cryptonote
       END_KV_SERIALIZE_MAP()
     };
   };
+
+  struct COMMAND_RPC_UPDATE
+  {
+    struct request
+    {
+      std::string command;
+      std::string path;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(command);
+        KV_SERIALIZE(path);
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      std::string status;
+      bool update;
+      std::string version;
+      std::string user_uri;
+      std::string auto_uri;
+      std::string hash;
+      std::string path;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(status)
+        KV_SERIALIZE(update)
+        KV_SERIALIZE(version)
+        KV_SERIALIZE(user_uri)
+        KV_SERIALIZE(auto_uri)
+        KV_SERIALIZE(hash)
+        KV_SERIALIZE(path)
+      END_KV_SERIALIZE_MAP()
+    };
+  };
 }