livestatus/src/InputBuffer.h

   1 // +------------------------------------------------------------------+
   2 // |             ____ _               _        __  __ _  __           |
   3 // |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
   4 // |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
   5 // |           | |___| | | |  __/ (__|   <    | |  | | . \            |
   6 // |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
   7 // |                                                                  |
   8 // | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
   9 // +------------------------------------------------------------------+
  10 //
  11 // This file is part of Check_MK.
  12 // The official homepage is at http://mathias-kettner.de/check_mk.
  13 //
  14 // check_mk is free software;  you can redistribute it and/or modify it
  15 // under the  terms of the  GNU General Public License  as published by
  16 // the Free Software Foundation in version 2.  check_mk is  distributed
  17 // in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
  18 // out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
  19 // PARTICULAR PURPOSE. See the  GNU General Public License for more de-
  20 // tails. You should have  received  a copy of the  GNU  General Public
  21 // License along with GNU Make; see the file  COPYING.  If  not,  write
  22 // to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
  23 // Boston, MA 02110-1301 USA.
  24
  25 #ifndef InputBuffer_h
  26 #define InputBuffer_h
  27
  28 #include "config.h"  // IWYU pragma: keep
  29 #include <chrono>
  30 #include <cstddef>
  31 #include <iosfwd>
  32 #include <list>
  33 #include <string>
  34 #include <vector>
  35 class Logger;
  36
  37 class InputBuffer {
  38 public:
  39     enum class Result {
  40         request_read,
  41         data_read,
  42         unexpected_eof,
  43         should_terminate,
  44         line_too_long,
  45         eof,
  46         empty_request,
  47         timeout
  48     };
  49
  50     friend std::ostream &operator<<(std::ostream &os, const Result &r);
  51
  52     InputBuffer(int fd, const bool &termination_flag, Logger *logger,
  53                 std::chrono::milliseconds query_timeout,
  54                 std::chrono::milliseconds idle_timeout);
  55     Result readRequest();
  56     bool empty() const;
  57     std::string nextLine();
  58
  59 private:
  60     int _fd;
  61     const bool &_termination_flag;
  62     std::chrono::milliseconds _query_timeout;
  63     std::chrono::milliseconds _idle_timeout;
  64     std::vector<char> _readahead_buffer;
  65     size_t _read_index;
  66     size_t _write_index;
  67     std::list<std::string> _request_lines;
  68     Logger *const _logger;
  69
  70     Result readData();
  71 };
  72
  73 #endif  // InputBuffer_h