git.m6w6.name Git - m6w6/libmemcached/blob - src/bin/memdump.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 <fstream>
  17 #include "mem_config.h"
  18
  19 #define PROGRAM_NAME        "memdump"
  20 #define PROGRAM_DESCRIPTION "Dump all values from one or many servers."
  21 #define PROGRAM_VERSION     "1.1"
  22
  23 #include "common/options.hpp"
  24 #include "common/checks.hpp"
  25
  26 static memcached_return_t print(const memcached_st *, const char *k, size_t l, void *ctx) {
  27   auto out = static_cast<std::ostream *>(ctx);
  28   out->write(k, l);
  29   out->put('\n');
  30   return MEMCACHED_SUCCESS;
  31 }
  32
  33 int main(int argc, char *argv[]) {
  34   client_options opt{PROGRAM_NAME, PROGRAM_VERSION, PROGRAM_DESCRIPTION};
  35
  36   for (const auto &def : opt.defaults) {
  37     switch (def.opt.val) {
  38     case 'H': // no need for --hash
  39     case 'b': // binary proto not available
  40       break;
  41     default:
  42       opt.add(def);
  43     }
  44   }
  45
  46   opt.add("file", 'f', required_argument, "Output to file instead of standard output.");
  47
  48   if (!opt.parse(argc, argv)) {
  49     exit(EXIT_FAILURE);
  50   }
  51
  52   if (opt.isset("quiet") && !opt.isset("file")) {
  53     std::cerr << "--quiet operation was requested, but --file was not set.\n";
  54     exit(EXIT_FAILURE);
  55   }
  56
  57   memcached_st memc;
  58   if (!check_memcached(opt, memc)) {
  59     exit(EXIT_FAILURE);
  60   }
  61
  62   if (!opt.apply(&memc)) {
  63     exit(EXIT_FAILURE);
  64   }
  65
  66   memcached_dump_fn cb[1] = {&print};
  67   std::ofstream outfile{};
  68   std::ostream *outstream = check_ostream(opt, opt.argof("file"), outfile);
  69
  70   auto rc = memcached_dump(&memc, cb, outstream, 1);
  71
  72   if (outfile) {
  73     if (opt.isset("debug")) {
  74       std::cerr << "Flushing " << opt.argof("file") << ".\n";
  75     }
  76     outfile.flush();
  77   }
  78
  79   if (MEMCACHED_SUCCESS != rc) {
  80     if (!opt.isset("quiet")) {
  81       std::cerr << "Failed to dump keys:" << memcached_last_error_message(&memc) << "\n";
  82     }
  83     memcached_free(&memc);
  84     exit(EXIT_FAILURE);
  85   }
  86
  87   memcached_free(&memc);
  88   exit(EXIT_SUCCESS);
  89 }