LCOV - code coverage report
Current view: top level - tests/integration/harness/gkfs.io - write_random.cpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 38 73.7 %
Date: 2024-04-30 13:21:35 Functions: 3 3 100.0 %
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             : /* C++ includes */
      30             : #include <CLI/CLI.hpp>
      31             : #include <nlohmann/json.hpp>
      32             : #include <memory>
      33             : #include <fmt/format.h>
      34             : #include <commands.hpp>
      35             : #include <reflection.hpp>
      36             : #include <serialize.hpp>
      37             : #include <binary_buffer.hpp>
      38             : #include <random>
      39             : #include <climits>
      40             : 
      41             : /* C includes */
      42             : #include <sys/types.h>
      43             : #include <fcntl.h>
      44             : #include <unistd.h>
      45             : 
      46             : #ifndef CHAR_BIT
      47             : #define CHAR_BIT 8
      48             : #endif
      49             : constexpr int seed = 42;
      50             : 
      51             : using json = nlohmann::json;
      52             : 
      53         494 : struct write_random_options {
      54             :     bool verbose{};
      55             :     std::string pathname{};
      56             :     ::size_t count{};
      57             : 
      58             :     REFL_DECL_STRUCT(write_random_options, REFL_DECL_MEMBER(bool, verbose),
      59             :                      REFL_DECL_MEMBER(std::string, pathname),
      60             :                      REFL_DECL_MEMBER(::size_t, count));
      61             : };
      62             : 
      63             : struct write_random_output {
      64             :     ::ssize_t retval;
      65             :     int errnum;
      66             : 
      67             :     REFL_DECL_STRUCT(write_random_output, REFL_DECL_MEMBER(::size_t, retval),
      68             :                      REFL_DECL_MEMBER(int, errnum));
      69             : };
      70             : 
      71             : void
      72           4 : to_json(json& record, const write_random_output& out) {
      73           4 :     record = serialize(out);
      74           4 : }
      75             : 
      76             : /**
      77             :  * Writes `count` random bytes to file
      78             :  * @param opts
      79             :  */
      80             : void
      81           4 : write_random_exec(const write_random_options& opts) {
      82             : 
      83           4 :     auto fd = ::open(opts.pathname.c_str(), O_WRONLY);
      84             : 
      85           4 :     if(fd == -1) {
      86           0 :         if(opts.verbose) {
      87           0 :             fmt::print("open(pathname=\"{}\", count={}) = {}, errno: {} [{}]\n",
      88           0 :                        opts.pathname, opts.count, fd, errno, ::strerror(errno));
      89           0 :             return;
      90             :         }
      91             : 
      92           0 :         json out = write_random_output{fd, errno};
      93           0 :         fmt::print("{}\n", out.dump(2));
      94           0 :         return;
      95             :     }
      96             :     // random number generator with seed
      97           4 :     std::independent_bits_engine<std::default_random_engine, CHAR_BIT,
      98             :                                  unsigned char>
      99           4 :             engine{seed};
     100             :     // create buffer for opts.count
     101           8 :     std::vector<uint8_t> data(opts.count);
     102           4 :     std::generate(begin(data), end(data), std::ref(engine));
     103             :     // pass data to buffer
     104           8 :     io::buffer buf(data);
     105             : 
     106           4 :     int rv = ::write(fd, buf.data(), opts.count);
     107             : 
     108           4 :     if(opts.verbose) {
     109           0 :         fmt::print("write(pathname=\"{}\", count={}) = {}, errno: {} [{}]\n",
     110           0 :                    opts.pathname, opts.count, rv, errno, ::strerror(errno));
     111           0 :         return;
     112             :     }
     113             : 
     114           8 :     json out = write_random_output{rv, errno};
     115           8 :     fmt::print("{}\n", out.dump(2));
     116             : }
     117             : 
     118             : void
     119         247 : write_random_init(CLI::App& app) {
     120             : 
     121             :     // Create the option and subcommand objects
     122         247 :     auto opts = std::make_shared<write_random_options>();
     123         494 :     auto* cmd = app.add_subcommand("write_random",
     124         494 :                                    "Execute the write() system call ");
     125             : 
     126             :     // Add options to cmd, binding them to opts
     127         247 :     cmd->add_flag("-v,--verbose", opts->verbose,
     128         494 :                   "Produce human writeable output");
     129             : 
     130         494 :     cmd->add_option("pathname", opts->pathname, "File name")
     131             :             ->required()
     132         494 :             ->type_name("");
     133             : 
     134         494 :     cmd->add_option("count", opts->count, "Number of random bytes to write")
     135             :             ->required()
     136         494 :             ->type_name("");
     137             : 
     138         992 :     cmd->callback([opts]() { write_random_exec(*opts); });
     139         247 : }

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