LCOV - code coverage report
Current view: top level - src/daemon - util.cpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 17 23 73.9 %
Date: 2024-04-23 00:09:24 Functions: 2 2 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   Copyright 2018-2024, Barcelona Supercomputing Center (BSC), Spain
       3             :   Copyright 2015-2024, Johannes Gutenberg Universitaet Mainz, Germany
       4             : 
       5             :   This software was partially supported by the
       6             :   EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu).
       7             : 
       8             :   This software was partially supported by the
       9             :   ADA-FS project under the SPPEXA project funded by the DFG.
      10             : 
      11             :   This file is part of GekkoFS.
      12             : 
      13             :   GekkoFS is free software: you can redistribute it and/or modify
      14             :   it under the terms of the GNU General Public License as published by
      15             :   the Free Software Foundation, either version 3 of the License, or
      16             :   (at your option) any later version.
      17             : 
      18             :   GekkoFS is distributed in the hope that it will be useful,
      19             :   but WITHOUT ANY WARRANTY; without even the implied warranty of
      20             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      21             :   GNU General Public License for more details.
      22             : 
      23             :   You should have received a copy of the GNU General Public License
      24             :   along with GekkoFS.  If not, see <https://www.gnu.org/licenses/>.
      25             : 
      26             :   SPDX-License-Identifier: GPL-3.0-or-later
      27             : */
      28             : 
      29             : #include <daemon/util.hpp>
      30             : #include <daemon/daemon.hpp>
      31             : 
      32             : #include <common/rpc/rpc_util.hpp>
      33             : 
      34             : using namespace std;
      35             : 
      36             : namespace gkfs::utils {
      37             : 
      38             : /**
      39             :  * @internal
      40             :  * Appends a single line to an existing shared hosts file with the RPC
      41             :  * connection information of this daemon. If it doesn't exist, it is created.
      42             :  * The line includes the hostname (and rootdir_suffix if applicable) and the RPC
      43             :  * server's listening address.
      44             :  *
      45             :  * NOTE, the shared file system must support strong consistency semantics to
      46             :  * ensure each daemon can write its information to the file even if the write
      47             :  * access is simultaneous.
      48             :  * @endinternal
      49             :  */
      50             : void
      51          33 : populate_hosts_file() {
      52          33 :     const auto& hosts_file = GKFS_DATA->hosts_file();
      53          33 :     GKFS_DATA->spdlogger()->debug("{}() Populating hosts file: '{}'", __func__,
      54          33 :                                   hosts_file);
      55          33 :     ofstream lfstream(hosts_file, ios::out | ios::app);
      56          33 :     if(!lfstream) {
      57           0 :         throw runtime_error(fmt::format("Failed to open hosts file '{}': {}",
      58           0 :                                         hosts_file, strerror(errno)));
      59             :     }
      60             :     // if rootdir_suffix is used, append it to hostname
      61          33 :     auto hostname =
      62          33 :             GKFS_DATA->rootdir_suffix().empty()
      63             :                     ? gkfs::rpc::get_my_hostname(true)
      64           0 :                     : fmt::format("{}#{}", gkfs::rpc::get_my_hostname(true),
      65          66 :                                   GKFS_DATA->rootdir_suffix());
      66          66 :     lfstream << fmt::format("{} {}", hostname, RPC_DATA->self_addr_str())
      67          33 :              << std::endl;
      68          33 :     if(!lfstream) {
      69           0 :         throw runtime_error(
      70           0 :                 fmt::format("Failed to write on hosts file '{}': {}",
      71           0 :                             hosts_file, strerror(errno)));
      72             :     }
      73          33 :     lfstream.close();
      74          33 : }
      75             : 
      76             : /**
      77             :  * @internal
      78             :  * This function removes the entire hosts file even if just one daemon is
      79             :  * shutdown. This makes sense because the data distribution calculation would be
      80             :  * misaligned if the entry of the current daemon was only removed.
      81             :  * @endinternal
      82             :  */
      83             : void
      84          33 : destroy_hosts_file() {
      85          33 :     std::remove(GKFS_DATA->hosts_file().c_str());
      86          33 : }
      87             : 
      88             : } // namespace gkfs::utils

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