git.m6w6.name Git - awesomized/libmemcached/blob - common/options.hpp

   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 Michael Wallner   <mike@php.net>                |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #pragma once
  17
  18 #include <algorithm>
  19 #include <cstdint>
  20 #include <climits>
  21 #include <functional>
  22 #include <iostream>
  23 #include <string>
  24 #include <vector>
  25
  26 #ifdef HAVE_GETOPT_H
  27 #  include <getopt.h>
  28 #elif defined _MSC_VER
  29 #  include "win32/getopt.h"
  30 #endif
  31
  32 #include "libmemcached/common.h"
  33
  34 class client_options {
  35 public:
  36
  37   struct extended_option {
  38     option opt;
  39     std::string help;
  40     std::function<bool(client_options &, extended_option &)> parse;
  41     std::function<bool(const client_options &, const extended_option &, memcached_st *)> apply;
  42     char *arg;
  43     bool set;
  44   };
  45
  46   std::vector<extended_option> options;
  47   std::vector<extended_option> defaults;
  48
  49   const char *prog_name;
  50   const char *prog_vers;
  51   const char *prog_desc;
  52   const char *prog_argp;
  53
  54   client_options(const char *prg, const char *ver, const char *dsc, const char *arg = nullptr)
  55   : options{}
  56   , defaults{}
  57   , prog_name{prg}
  58   , prog_vers{ver}
  59   , prog_desc{dsc}
  60   , prog_argp{arg}
  61   {
  62
  63     def("help", 'h', no_argument, "Print this help.")
  64         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *) {
  65       if (ext.set) {
  66         opt.print_help();
  67         exit(EXIT_SUCCESS);
  68       }
  69       return true;
  70     };
  71     def("version", 'V', no_argument, "Print program version.")
  72         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *) {
  73       if (ext.set) {
  74         opt.print_version();
  75         exit(EXIT_SUCCESS);
  76       }
  77       return true;
  78     };
  79
  80     def("verbose", 'v', no_argument, "Print more informational output.")
  81         .parse = [](client_options &opt, extended_option &) {
  82       opt.unset("quiet");
  83       return true;
  84     };
  85     def("debug", 'd', no_argument, "Print output useful only for debugging.")
  86         .parse = [](client_options &opt, extended_option &) {
  87       opt.set("verbose");
  88       opt.unset("quiet");
  89       return true;
  90     };
  91     def("quiet", 'q', no_argument, "Print no output, not even errors.")
  92         .parse = [](client_options &opt, extended_option &) {
  93       opt.unset("verbose");
  94       opt.unset("debug");
  95       return true;
  96     };
  97
  98     def("password", 'p', required_argument, "SASL password.");
  99     def("username", 'u', required_argument, "SASL username.")
 100         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 101       if (auto username = ext.arg) {
 102 #if !LIBMEMCACHED_WITH_SASL_SUPPORT
 103           if (!opt.isset("quiet")) {
 104             std::cerr
 105                 << "SASL username was supplied, but binary was not built with SASL support.\n";
 106           }
 107           return false;
 108 #else
 109         if (memc) {
 110           if (MEMCACHED_SUCCESS
 111               != memcached_set_sasl_auth_data(memc, username, opt.argof("password"))) {
 112             if (!opt.isset("quiet")) {
 113               std::cerr << memcached_last_error_message(memc);
 114             }
 115             return false;
 116           }
 117         }
 118 #endif
 119       }
 120       return true;
 121     };
 122
 123     def("binary", 'b', no_argument, "Use the binary memcached protocol.")
 124         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 125       if (MEMCACHED_SUCCESS != memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_BINARY_PROTOCOL, ext.set)) {
 126         if(!opt.isset("quiet")) {
 127           std::cerr << memcached_last_error_message(memc);
 128         }
 129         return false;
 130       }
 131       return true;
 132     };
 133     def("buffer", 'B', no_argument, "Buffer requests.")
 134         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 135       if (MEMCACHED_SUCCESS != memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_BUFFER_REQUESTS, ext.set)) {
 136         if(!opt.isset("quiet")) {
 137           std::cerr << memcached_last_error_message(memc);
 138         }
 139         return false;
 140       }
 141       return true;
 142     };
 143     def("non-blocking", 'n', no_argument, "Use non-blocking connections.")
 144         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 145       if (MEMCACHED_SUCCESS != memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_NO_BLOCK, ext.set)) {
 146         if(!opt.isset("quiet")) {
 147           std::cerr << memcached_last_error_message(memc);
 148         }
 149         return false;
 150       }
 151       return true;
 152     };
 153     def("tcp-nodelay", 'N', no_argument, "Disable Nagle's algorithm.")
 154         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 155       if (MEMCACHED_SUCCESS != memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_TCP_NODELAY, ext.set)) {
 156         if(!opt.isset("quiet")) {
 157           std::cerr << memcached_last_error_message(memc);
 158         }
 159         return false;
 160       }
 161       return true;
 162     };
 163     def("servers", 's', required_argument, "List of servers to connect to.")
 164         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 165       auto servers = ext.arg;
 166       if (!servers) {
 167         if (opt.isset("verbose")) {
 168           std::cerr << "Checking environment for a server list in MEMCACHED_SERVERS.\n";
 169         }
 170         servers = getenv("MEMCACHED_SERVERS");
 171         if (!servers || !*servers) {
 172           if (!opt.isset("quiet")) {
 173             std::cerr << "No servers provided.\n";
 174           }
 175           return false;
 176         }
 177       }
 178
 179       auto server_list = memcached_servers_parse(servers);
 180       if (!server_list || !memcached_server_list_count(server_list)) {
 181         if (!opt.isset("quiet")) {
 182           std::cerr << "Invalid server list provided: '" << servers << "'\n";
 183         }
 184         if (server_list) {
 185           memcached_server_list_free(server_list);
 186         }
 187         return false;
 188       }
 189
 190       if (MEMCACHED_SUCCESS != memcached_server_push(memc, server_list)) {
 191         if (!opt.isset("quiet")) {
 192           std::cerr << memcached_last_error_message(memc);
 193         }
 194         memcached_server_list_free(server_list);
 195         return false;
 196       }
 197       memcached_server_list_free(server_list);
 198       return true;
 199     };
 200     def("hash", 'H', required_argument, "Key hashing method.")
 201         .apply = [](const client_options &opt, const extended_option &ext, memcached_st *memc) {
 202       if (ext.set) {
 203         std::string hash_wanted{ext.arg};
 204         memcached_hash_t hash = MEMCACHED_HASH_DEFAULT;
 205
 206         std::transform(hash_wanted.begin(), hash_wanted.end(), hash_wanted.begin(), ::toupper);
 207
 208         if (opt.isset("verbose")) {
 209           std::cerr << "Checking for hash '" << hash_wanted << "'.\n";
 210         }
 211         for (int h = MEMCACHED_HASH_DEFAULT; h < MEMCACHED_HASH_MAX; ++h) {
 212           auto hash_type = static_cast<memcached_hash_t>(h);
 213           std::string hash_string{libmemcached_string_hash(hash_type)};
 214
 215           if (hash_wanted.length() == hash_string.length()) {
 216             auto ci = std::equal(hash_string.begin(), hash_string.end(), hash_wanted.begin(),
 217                                  [](int a, int b) { return ::toupper(a) == b; });
 218             if (ci) {
 219               hash = hash_type;
 220               break;
 221             }
 222           }
 223         }
 224         if (hash == MEMCACHED_HASH_DEFAULT) {
 225           if (!opt.isset("quiet")) {
 226             std::cerr << "Could not find hash '" << hash_wanted << "'.\n";
 227           }
 228         }
 229         if (MEMCACHED_SUCCESS != memcached_behavior_set_key_hash(memc, hash)) {
 230           if (!opt.isset("quiet")) {
 231             std::cerr << memcached_last_error_message(memc);
 232           }
 233           return false;
 234         }
 235       }
 236       return true;
 237     };
 238   }
 239
 240   extended_option &def(option opt, std::string help) {
 241     defaults.emplace_back(extended_option{opt, std::move(help), {}, {}, nullptr, false});
 242     return defaults.back();
 243   }
 244
 245   extended_option &def(const char *name, char flag, int has_arg, const char *help) {
 246     return def(option{name, has_arg, nullptr, flag}, help);
 247   }
 248
 249   extended_option &add(extended_option ext) {
 250     options.emplace_back(std::move(ext));
 251     return options.back();
 252   }
 253
 254   extended_option &add(option opt, std::string help) {
 255     options.emplace_back(extended_option{opt, std::move(help), nullptr, nullptr, nullptr, false});
 256     return options.back();
 257   }
 258
 259   extended_option &add(const char *name, char flag, int has_arg, const char *help) {
 260     return add(option{name, has_arg, nullptr, flag}, help);
 261   }
 262
 263   extended_option &get(const std::string &name) {
 264     // UB if not found
 265     return *find(name);
 266   }
 267   extended_option &get(int c) {
 268     // UB if not found
 269     return *find(c);
 270   }
 271
 272   const extended_option &get(const std::string &name) const {
 273     // UB if not found
 274     return *find(name);
 275   }
 276   const extended_option &get(int c) const {
 277     // UB if not found
 278     return *find(c);
 279   }
 280
 281   bool has(const std::string &name) const {
 282     auto found = find(name);
 283     return found != options.cend();
 284   }
 285   bool has(int c) const {
 286     auto found = find(c);
 287     return found != options.cend();
 288   }
 289
 290   bool isset(const std::string &name) const {
 291     return has(name) && get(name).set;
 292   }
 293   bool isset(int c) const {
 294     return has(c) && get(c).set;
 295   }
 296
 297   void unset(const std::string &name) {
 298     set(name, false);
 299   }
 300   void unset(int c) {
 301     set(c, false);
 302   }
 303
 304   void set(const std::string &name, bool set_ = true, char *optarg_ = nullptr) {
 305     if (has(name)) {
 306       auto &opt = get(name);
 307       opt.set = set_;
 308       opt.arg = optarg_;
 309     }
 310   }
 311   void set(int c, bool set_ = true, char *optarg_ = nullptr) {
 312     if (has(c)) {
 313       auto &opt = get(c);
 314       opt.set = set_;
 315       opt.arg = optarg_;
 316     }
 317   }
 318
 319   char *argof(const std::string &name) const {
 320     if (has(name)) {
 321       return get(name).arg;
 322     }
 323     return nullptr;
 324   }
 325   char *argof(int c) const {
 326     if (has(c)) {
 327       return get(c).arg;
 328     }
 329     return nullptr;
 330   }
 331
 332   const extended_option &operator[](const std::string &name) const {
 333     return get(name);
 334   }
 335   const extended_option &operator[](int c) const {
 336     return get(c);
 337   }
 338
 339   void print_version() const;
 340   void print_help() const;
 341
 342   bool parse(int argc, char *argv[], char ***argp = nullptr);
 343   bool apply(memcached_st *memc);
 344
 345 private:
 346   using iterator = std::vector<extended_option>::iterator;
 347   using const_iterator = std::vector<extended_option>::const_iterator;
 348   using predicate = std::function<bool(const extended_option &ext)>;
 349
 350   const_iterator find(const predicate &pred) const {
 351     return std::find_if(options.cbegin(), options.cend(), pred);
 352   }
 353   const_iterator find(const std::string &name) const {
 354     return find([&name](const extended_option &ext) {
 355       return ext.opt.name && ext.opt.name == name;
 356     });
 357   }
 358   const_iterator find(int c) const {
 359     return find([c](const extended_option &ext) {
 360       return ext.opt.val == c || (c == 1 && ext.opt.val == '-');
 361     });
 362   }
 363
 364   iterator find(const predicate &pred) {
 365     return std::find_if(options.begin(), options.end(), pred);
 366   }
 367   iterator find(const std::string &name) {
 368     return find([&name](const extended_option &ext) {
 369       return ext.opt.name && ext.opt.name == name;
 370     });
 371   }
 372   iterator find(int c) {
 373     return find([c](const extended_option &ext) {
 374       return ext.opt.val == c || (c == 1 && ext.opt.val == '-');
 375     });
 376   }
 377 };