git.m6w6.name Git - m6w6/libmemcached/blob - src/bin/memcat.cc

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached - C/C++ Client Library for memcached                  |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020-2021 Michael Wallner        https://awesome.co/ |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #include "mem_config.h"
  17
  18 #define PROGRAM_NAME        "memcat"
  19 #define PROGRAM_DESCRIPTION "Cat a set of key values to stdout."
  20 #define PROGRAM_VERSION     "1.1"
  21
  22 #include "common/options.hpp"
  23 #include "common/checks.hpp"
  24
  25 #include <iostream>
  26 #include <fstream>
  27
  28 memcached_return_t memcat(const client_options &opt, memcached_st *memc, const char *key, std::ostream *ref) {
  29   memcached_return_t rc;
  30   uint32_t flags;
  31   size_t len;
  32   auto val = memcached_get(memc, key, strlen(key), &len, &flags, &rc);
  33   auto verbose = opt.isset("verbose");
  34
  35   if (MEMCACHED_SUCCESS == rc) {
  36     if (verbose) {
  37       *ref << "key: " << key << "\n";
  38     }
  39     if (opt.isset("flags")) {
  40       if (verbose) {
  41       *ref << "flags: ";
  42       }
  43       *ref << flags << "\n";
  44     }
  45     if (verbose) {
  46       *ref << "value: ";
  47     }
  48
  49     ref->write(val, len);
  50
  51     if (verbose || !opt.isset("file")) {
  52       *ref << std::endl;
  53     }
  54
  55     ref->flush();
  56   }
  57
  58   if (val) {
  59     free(val);
  60   }
  61   return rc;
  62 }
  63
  64 int main(int argc, char *argv[]) {
  65   client_options opt{PROGRAM_NAME, PROGRAM_VERSION, PROGRAM_DESCRIPTION, "key [key ...]"};
  66
  67   for (const auto &def : opt.defaults) {
  68     opt.add(def);
  69   }
  70   opt.add("flags", 'F', no_argument, "Display key flags, too.");
  71   opt.add("file", 'f', optional_argument, "Output to file instead of standard output."
  72                                           "\n\t\t# NOTE: defaults to <key> if no argument was provided.");
  73
  74   char **argp = nullptr;
  75   if (!opt.parse(argc, argv, &argp)) {
  76     exit(EXIT_FAILURE);
  77   }
  78
  79   if (opt.isset("quiet") && !opt.isset("file")) {
  80     std::cerr << "--quiet operation was requested, but --file was not set.\n";
  81     exit(EXIT_FAILURE);
  82   }
  83
  84   memcached_st memc;
  85   if (!check_memcached(opt, memc)) {
  86     exit(EXIT_FAILURE);
  87   }
  88
  89   if (!opt.apply(&memc)) {
  90     memcached_free(&memc);
  91     exit(EXIT_FAILURE);
  92   }
  93
  94   if (!check_argp(opt, argp, "No key(s) provided.")) {
  95     memcached_free(&memc);
  96     exit(EXIT_FAILURE);
  97   }
  98
  99   auto file_flag = opt.isset("file");
 100   auto file = opt.argof("file");
 101   auto exit_code = EXIT_SUCCESS;
 102   for (auto arg = argp; *arg; ++arg) {
 103     auto key = *arg;
 104     if (*key) {
 105       if (!file && file_flag) {
 106         file = key;
 107       }
 108
 109       std::ofstream fstream{};
 110       std::ostream *ostream = check_ostream(opt, file, fstream);
 111
 112       if (!check_return(opt, memc, key, memcat(opt, &memc, key, ostream))) {
 113         exit_code = EXIT_FAILURE;
 114       }
 115     }
 116   }
 117
 118   memcached_free(&memc);
 119   exit(exit_code);
 120 }