LCOV - code coverage report
Current view: top level - tests/integration/harness/gkfs.io - read.cpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 24 34 70.6 %
Date: 2024-04-23 00:09:24 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             : 
      39             : /* C includes */
      40             : #include <sys/types.h>
      41             : #include <sys/stat.h>
      42             : #include <fcntl.h>
      43             : #include <unistd.h>
      44             : 
      45             : using json = nlohmann::json;
      46             : 
      47         536 : struct read_options {
      48             :     bool verbose{};
      49             :     std::string pathname;
      50             :     ::size_t count;
      51             : 
      52             :     REFL_DECL_STRUCT(read_options, REFL_DECL_MEMBER(bool, verbose),
      53             :                      REFL_DECL_MEMBER(std::string, pathname),
      54             :                      REFL_DECL_MEMBER(::size_t, count));
      55             : };
      56             : 
      57          14 : struct read_output {
      58             :     ::ssize_t retval;
      59             :     io::buffer buf;
      60             :     int errnum;
      61             : 
      62             :     REFL_DECL_STRUCT(read_output, REFL_DECL_MEMBER(::size_t, retval),
      63             :                      REFL_DECL_MEMBER(void*, buf),
      64             :                      REFL_DECL_MEMBER(int, errnum));
      65             : };
      66             : 
      67             : void
      68          14 : to_json(json& record, const read_output& out) {
      69          14 :     record = serialize(out);
      70          14 : }
      71             : 
      72             : void
      73          14 : read_exec(const read_options& opts) {
      74             : 
      75          14 :     auto fd = ::open(opts.pathname.c_str(), O_RDONLY);
      76             : 
      77          14 :     if(fd == -1) {
      78           0 :         if(opts.verbose) {
      79           0 :             fmt::print("read(pathname=\"{}\", count={}) = {}, errno: {} [{}]\n",
      80           0 :                        opts.pathname, opts.count, fd, errno, ::strerror(errno));
      81           0 :             return;
      82             :         }
      83             : 
      84           0 :         json out = read_output{fd, nullptr, errno};
      85           0 :         fmt::print("{}\n", out.dump(2));
      86             : 
      87           0 :         return;
      88             :     }
      89             : 
      90          28 :     io::buffer buf(opts.count);
      91             : 
      92          14 :     auto rv = ::read(fd, buf.data(), opts.count);
      93             : 
      94          14 :     if(opts.verbose) {
      95           0 :         fmt::print("read(pathname=\"{}\", count={}) = {}, errno: {} [{}]\n",
      96           0 :                    opts.pathname, opts.count, rv, errno, ::strerror(errno));
      97           0 :         return;
      98             :     }
      99             : 
     100          42 :     json out = read_output{rv, (rv != -1 ? buf : nullptr), errno};
     101          28 :     fmt::print("{}\n", out.dump(2));
     102             : }
     103             : 
     104             : void
     105         268 : read_init(CLI::App& app) {
     106             : 
     107             :     // Create the option and subcommand objects
     108         268 :     auto opts = std::make_shared<read_options>();
     109         268 :     auto* cmd = app.add_subcommand("read", "Execute the read() system call");
     110             : 
     111             :     // Add options to cmd, binding them to opts
     112         268 :     cmd->add_flag("-v,--verbose", opts->verbose,
     113         536 :                   "Produce human readable output");
     114             : 
     115         536 :     cmd->add_option("pathname", opts->pathname, "Directory name")
     116             :             ->required()
     117         536 :             ->type_name("");
     118             : 
     119         536 :     cmd->add_option("count", opts->count, "Number of bytes to read")
     120             :             ->required()
     121         536 :             ->type_name("");
     122             : 
     123        1086 :     cmd->callback([opts]() { read_exec(*opts); });
     124         268 : }

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