funcs/func_realtime.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2005-2006, BJ Weschke. All rights reserved.
   5  *
   6  * BJ Weschke <bweschke@btwtech.com>
   7  *
   8  * This code is released by the author with no restrictions on usage.
   9  *
  10  * See http://www.asterisk.org for more information about
  11  * the Asterisk project. Please do not directly contact
  12  * any of the maintainers of this project for assistance;
  13  * the project provides a web site, mailing lists and IRC
  14  * channels for your use.
  15  *
  16  */
  17
  18 /*! \file
  19  *
  20  * \brief REALTIME dialplan function
  21  *
  22  * \author BJ Weschke <bweschke@btwtech.com>
  23  *
  24  * \ingroup functions
  25  */
  26
  27 #include "asterisk.h"
  28
  29 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <string.h>
  35 #include <sys/types.h>
  36
  37 #include "asterisk/file.h"
  38 #include "asterisk/channel.h"
  39 #include "asterisk/pbx.h"
  40 #include "asterisk/options.h"
  41 #include "asterisk/config.h"
  42 #include "asterisk/module.h"
  43 #include "asterisk/lock.h"
  44 #include "asterisk/logger.h"
  45 #include "asterisk/utils.h"
  46 #include "asterisk/app.h"
  47
  48 static int function_realtime_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
  49 {
  50         struct ast_variable *var, *head;
  51         struct ast_module_user *u;
  52         char *results;
  53         size_t resultslen = 0;
  54         AST_DECLARE_APP_ARGS(args,
  55                 AST_APP_ARG(family);
  56                 AST_APP_ARG(fieldmatch);
  57                 AST_APP_ARG(value);
  58                 AST_APP_ARG(delim1);
  59                 AST_APP_ARG(delim2);
  60         );
  61
  62
  63         if (ast_strlen_zero(data)) {
  64                 ast_log(LOG_WARNING, "Syntax: REALTIME(family|fieldmatch[|value[|delim1[|delim2]]]) - missing argument!\n");
  65                 return -1;
  66         }
  67
  68         u = ast_module_user_add(chan);
  69
  70         AST_STANDARD_APP_ARGS(args, data);
  71
  72         if (!args.delim1)
  73                 args.delim1 = "|";
  74         if (!args.delim2)
  75                 args.delim2 = "=";
  76
  77         head = ast_load_realtime(args.family, args.fieldmatch, args.value, NULL);
  78
  79         if (!head) {
  80                 ast_module_user_remove(u);
  81                 return -1;
  82         }
  83         for (var = head; var; var = var->next)
  84                 resultslen += strlen(var->name) + strlen(var->value) + 2;
  85
  86         results = alloca(resultslen);
  87         for (var = head; var; var = var->next)
  88                 ast_build_string(&results, &resultslen, "%s%s%s%s", var->name, args.delim2, var->value, args.delim1);
  89         ast_copy_string(buf, results, len);
  90
  91         ast_module_user_remove(u);
  92
  93         return 0;
  94 }
  95
  96 static int function_realtime_write(struct ast_channel *chan, char *cmd, char *data, const char *value)
  97 {
  98         struct ast_module_user *u;
  99         int res = 0;
 100         AST_DECLARE_APP_ARGS(args,
 101                 AST_APP_ARG(family);
 102                 AST_APP_ARG(fieldmatch);
 103                 AST_APP_ARG(value);
 104                 AST_APP_ARG(field);
 105         );
 106
 107         if (ast_strlen_zero(data)) {
 108                 ast_log(LOG_WARNING, "Syntax: REALTIME(family|fieldmatch|value|newcol) - missing argument!\n");
 109                 return -1;
 110         }
 111
 112         u = ast_module_user_add(chan);
 113
 114         AST_STANDARD_APP_ARGS(args, data);
 115
 116         res = ast_update_realtime(args.family, args.fieldmatch, args.value, args.field, (char *)value, NULL);
 117
 118         if (res < 0) {
 119                 ast_log(LOG_WARNING, "Failed to update. Check the debug log for possible data repository related entries.\n");
 120         }
 121
 122         ast_module_user_remove(u);
 123
 124         return 0;
 125 }
 126
 127 struct ast_custom_function realtime_function = {
 128         .name = "REALTIME",
 129         .synopsis = "RealTime Read/Write Functions",
 130         .syntax = "REALTIME(family|fieldmatch[|value[|delim1[|delim2]]]) on read\n"
 131                   "REALTIME(family|fieldmatch|value|field) on write\n",
 132         .desc = "This function will read or write values from/to a RealTime repository.\n"
 133                 "REALTIME(....) will read names/values from the repository, and \n"
 134                 "REALTIME(....)= will write a new value/field to the repository. On a\n"
 135                 "read, this function returns a delimited text string. The name/value \n"
 136                 "pairs are delimited by delim1, and the name and value are delimited \n"
 137                 "between each other with delim2. The default for delim1 is '=' and   \n"
 138                 "the default for delim2 is '|'. If there is no match, NULL will be   \n"
 139                 "returned by the function. On a write, this function will always     \n"
 140                 "return NULL. \n",
 141         .read = function_realtime_read,
 142         .write = function_realtime_write,
 143 };
 144
 145 static int unload_module(void)
 146 {
 147         int res = ast_custom_function_unregister(&realtime_function);
 148
 149         ast_module_user_hangup_all();
 150
 151         return res;
 152 }
 153
 154 static int load_module(void)
 155 {
 156         int res = ast_custom_function_register(&realtime_function);
 157
 158         return res;
 159 }
 160
 161 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Read/Write values from a RealTime repository");