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// This file is part of Roxen WebServer. 
// Copyright © 1996 - 2001, Roxen IS. 
// $Id: module.pike,v 1.160 2004/03/16 13:58:10 grubba Exp $ 
 
#include <module_constants.h> 
#include <module.h> 
#include <request_trace.h> 
 
constant __pragma_save_parent__ = 1; 
 
inherit "basic_defvar"; 
mapping(string:array(int)) error_log=([]); 
 
constant is_module = 1; 
// constant module_type = MODULE_ZERO; 
// constant module_name    = "Unnamed module"; 
// constant module_doc     = "Undocumented"; 
constant module_unique  = 1; 
 
 
private Configuration _my_configuration; 
private string _module_local_identifier; 
private string _module_identifier = 
  lambda() { 
    mixed init_info = roxen->bootstrap_info->get(); 
    if (arrayp (init_info)) { 
      [_my_configuration, _module_local_identifier] = init_info; 
      return _my_configuration->name + "/" + _module_local_identifier; 
    } 
  }(); 
static mapping _api_functions = ([]); 
 
string|array(string) module_creator; 
string module_url; 
RXML.TagSet module_tag_set; 
 
/* These functions exists in here because otherwise the messages in 
 * the event log does not always end up in the correct 
 * module/configuration.  And the reason for that is that if the 
 * messages are logged from subclasses in the module, the DWIM in 
 * roxenlib.pike cannot see that they are logged from a module. This 
 * solution is not really all that beautiful, but it works. :-) 
 */ 
void report_fatal( mixed ... args )  { predef::report_fatal( @args );  } 
void report_error( mixed ... args )  { predef::report_error( @args );  } 
void report_notice( mixed ... args ) { predef::report_notice( @args ); } 
void report_debug( mixed ... args )  { predef::report_debug( @args );  } 
 
 
string module_identifier() 
//! Returns a string that uniquely identifies this module instance 
//! within the server. The identifier is the same as 
//! @[Roxen.get_module] and @[Roxen.get_modname] handles. 
{ 
#if 1 
  return _module_identifier; 
#else 
  if (!_module_identifier) { 
    string|mapping name = this_object()->register_module()[1]; 
    if (mappingp (name)) name = name->standard; 
    string cname = sprintf ("%O", my_configuration()); 
    if (sscanf (cname, "Configuration(%s", cname) == 1 && 
        sizeof (cname) && cname[-1] == ')') 
      cname = cname[..sizeof (cname) - 2]; 
    _module_identifier = sprintf ("%s,%s", 
                                  name||this_object()->module_name, cname); 
  } 
  return _module_identifier; 
#endif 
} 
 
string module_local_id() 
//! Returns a string that uniquely identifies this module instance 
//! within the configuration. The returned string is the same as the 
//! part after the first '/' in the one returned from 
//! @[module_identifier]. 
{ 
  return _module_local_identifier; 
} 
 
RoxenModule this_module() 
{ 
  return this_object(); // To be used from subclasses. 
} 
 
string _sprintf() 
{ 
  return sprintf ("RoxenModule(%s)", _module_identifier || "?"); 
} 
 
array register_module() 
{ 
  return ({ 
    this_object()->module_type, 
    this_object()->module_name, 
    this_object()->module_doc, 
    0, 
    module_unique, 
    this_object()->module_locked, 
  }); 
} 
 
string fix_cvs(string from) 
{ 
  from = replace(from, ({ "$", "Id: "," Exp $" }), ({"","",""})); 
  sscanf(from, "%*s,v %s", from); 
  return replace(from,"/","-"); 
} 
 
int module_dependencies(Configuration configuration, 
                        array (string) modules, 
                        int|void now) 
//! If your module depends on other modules present in the server, 
//! calling <pi>module_dependencies()</pi>, supplying an array of 
//! module identifiers. A module identifier is either the filename 
//! minus extension, or a string on the form that Roxen.get_modname 
//! returns. In the latter case, the <config name> and <copy> parts 
//! are ignored. 
{ 
  modules = map (modules, 
                 lambda (string modname) { 
                   sscanf ((modname / "/")[-1], "%[^#]", modname); 
                   return modname; 
                 }); 
  Configuration conf = configuration || my_configuration(); 
  if (!conf) 
    report_warning ("Configuration not resolved; module(s) %s that %s " 
                    "depend on weren't added.", String.implode_nicely (modules), 
                    module_identifier()); 
  else 
    conf->add_modules( modules, now ); 
  return 1; 
} 
 
string file_name_and_stuff() 
{ 
  return ("<b>Loaded from:</b> "+(roxen->filename(this_object()))+"<br>"+ 
          (this_object()->cvs_version? 
           "<b>CVS Version:</b> "+ 
           fix_cvs(this_object()->cvs_version)+"\n":"")); 
} 
 
 
Configuration my_configuration() 
//! Returns the Configuration object of the virtual server the module 
//! belongs to. 
{ 
  return _my_configuration; 
} 
 
nomask void set_configuration(Configuration c) 
{ 
  if(_my_configuration && _my_configuration != c) 
    error("set_configuration() called twice.\n"); 
  _my_configuration = c; 
} 
 
void set_module_creator(string|array(string) c) 
//! Set the name and optionally email address of the author of the 
//! module. Names on the format "author name <author_email>" will 
//! end up as links on the module's information page in the admin 
//! interface. In the case of multiple authors, an array of such 
//! strings can be passed. 
{ 
  module_creator = c; 
} 
 
void set_module_url(string to) 
//! A common way of referring to a location where you maintain 
//! information about your module or similar. The URL will turn up 
//! on the module's information page in the admin interface, 
//! referred to as the module's home page. 
{ 
  module_url = to; 
} 
 
void free_some_sockets_please(){} 
 
void start(void|int num, void|Configuration conf) {} 
 
string status() {} 
 
string info(Configuration conf) 
{ 
 return (this_object()->register_module()[2]); 
} 
 
string sname( ) 
{ 
  return my_configuration()->otomod[ this_object() ]; 
} 
 
ModuleInfo my_moduleinfo( ) 
//! Returns the associated @[ModuleInfo] object 
{ 
  string f = sname(); 
  if( f ) return roxen.find_module( (f/"#")[0] ); 
} 
 
void save_me() 
{ 
  my_configuration()->save_one( this_object() ); 
  my_configuration()->module_changed( my_moduleinfo(), this_object() ); 
} 
 
void save()      { save_me(); } 
string comment() { return ""; } 
 
string query_internal_location() 
//! Returns the internal mountpoint, where <ref>find_internal()</ref> 
//! is mounted. 
{ 
  if(!_my_configuration) 
    error("Please do not call this function from create()!\n"); 
  return _my_configuration->query_internal_location(this_object()); 
} 
 
string query_absolute_internal_location(RequestID id) 
//! Returns the internal mountpoint as an absolute path. 
{ 
  return (id->misc->site_prefix_path || "") + query_internal_location(); 
} 
 
string query_location() 
//! Returns the mountpoint as an absolute path. The default 
//! implementation uses the "location" configuration variable in the 
//! module. 
{ 
  string s; 
  catch{s = query("location");}; 
  return s; 
} 
 
array(string) location_urls() 
//! Returns an array of all locations where the module is mounted. 
{ 
  string loc = query_location(); 
  if (!loc) return ({}); 
  if(!_my_configuration) 
    error("Please do not call this function from create()!\n"); 
  array(string) urls = copy_value(_my_configuration->query("URLs")); 
  string hostname; 
  if (string world_url = _my_configuration->query ("MyWorldLocation")) 
    sscanf (world_url, "%*s://%s%*[:/]", hostname); 
  if (!hostname) hostname = gethostname(); 
  for (int i = 0; i < sizeof (urls); i++) 
  { 
    urls[i] = (urls[i]/"#")[0]; 
    if (sizeof (urls[i]/"*") == 2) 
      urls[i] = replace(urls[i], "*", hostname); 
  } 
  return map (urls, `+, loc[1..]); 
} 
 
/* By default, provide nothing. */ 
string query_provides() { return 0; } 
 
 
function(RequestID:int|mapping) query_seclevels() 
{ 
  if(catch(query("_seclevels")) || (query("_seclevels") == 0)) 
    return 0; 
  return roxen.compile_security_pattern(query("_seclevels"),this_object()); 
} 
 
Stat stat_file(string f, RequestID id){} 
array(string) find_dir(string f, RequestID id){} 
mapping(string:Stat) find_dir_stat(string f, RequestID id) 
{ 
  TRACE_ENTER("find_dir_stat(): \""+f+"\"", 0); 
 
  array(string) files = find_dir(f, id); 
  mapping(string:Stat) res = ([]); 
 
  foreach(files || ({}), string fname) { 
    TRACE_ENTER("stat()'ing "+ f + "/" + fname, 0); 
    Stat st = stat_file(replace(f + "/" + fname, "//", "/"), id); 
    if (st) { 
      res[fname] = st; 
      TRACE_LEAVE("OK"); 
    } else { 
      TRACE_LEAVE("No stat info"); 
    } 
  } 
 
  TRACE_LEAVE(""); 
  return(res); 
} 
 
//! Return the set of properties for @[path]. 
//! 
//! @returns 
//!   Returns @tt{0@} (zero) if @[path] does not exist. 
//! 
//!   Otherwise returns a @[PropertySet] object. 
PropertySet query_properties(string path, RequestID id) 
{ 
  Stat st = stat_file(path, id); 
 
  if (!st) return 0; 
  return PropertySet(path, id, st); 
} 
 
//! Returns the value of the specified property, or an error code 
//! mapping. 
//! 
//! The default implementation takes care of the most important RFC 
//! 2518 properties. 
//! 
//! @param st 
//!   If set, this should be the stat that corresponds to @[path]. Its 
//!   only purpose is to save a call to @[stat_file] when the stat 
//!   already has been retrieved. 
//! 
//! @note 
//!   Returning a string is shorthand for returning an array 
//!   with a single text node. 
string|array(Parser.XML.Tree.Node)|mapping(string:mixed) 
  query_property(string path, string prop_name, RequestID id) 
{ 
  PropertySet properties = query_properties(path, id); 
  if (!properties) { 
    return Roxen.http_status(Protocols.HTTP.HTTP_NOT_FOUND, 
                             "No such file or directory."); 
  } 
  return properties->query_property(prop_name) || 
    Roxen.http_status(Protocols.HTTP.HTTP_NOT_FOUND, "No such property."); 
} 
 
//! RFC 2518 PROPFIND implementation with recursion according to 
//! @[depth]. See @[find_properties] for details. 
void recurse_find_properties(string path, string mode, 
                             int depth, MultiStatus result, 
                             RequestID id, 
                             multiset(string)|void filt, 
                             void|Stat st) 
{ 
  PropertySet properties = query_properties(path, id); 
 
  if (!properties) return;      // Path not found. 
 
  mapping(string:mixed) ret = 
    properties->find_properties(mode, result, filt); 
 
  if (ret) { 
    result->add_response(path, XMLStatusNode(ret->error, ret->rettext)); 
    if (ret->rettext) { 
      Parser.XML.Tree.ElementNode descr = 
        Parser.XML.Tree.ElementNode ("DAV:responsedescription", ([])); 
      descr->add_child (Parser.XML.Tree.TextNode (ret->rettext)); 
      result->add_response (path, descr); 
    } 
    return; 
  } 
  if ((depth <= 0) || !st->isdir) return; 
  depth--; 
  foreach(find_dir(path, id) || ({}), string filename) { 
    recurse_find_properties(combine_path(path, filename), mode, depth, 
                            result, id, filt); 
  } 
  return; 
} 
 
mapping(string:mixed) patch_properties(string path, 
                                       array(PatchPropertyCommand) instructions, 
                                       MultiStatus result, RequestID id) 
{ 
  PropertySet properties = query_properties(path, id); 
 
  if (!properties) return 0;    // Path not found. 
 
  mapping(string:mixed) errcode = properties->start(); 
 
  if (errcode) return errcode; 
 
  array(mapping(string:mixed)) results; 
 
  mixed err = catch { 
      results = instructions->execute(properties); 
    }; 
  if (err) { 
    properties->unroll(); 
    throw (err); 
  } else { 
    int any_failed; 
    foreach(results, mapping(string:mixed) answer) { 
      if (any_failed = (answer && (answer->error >= 300))) { 
        break; 
      } 
    } 
    if (any_failed) { 
      // Unroll and fail any succeeded items. 
      int i; 
      mapping(string:mixed) answer = 
        Roxen.http_status (Protocols.HTTP.DAV_FAILED_DEP, "Failed dependency."); 
      for(i = 0; i < sizeof(results); i++) { 
        if (!results[i] || results[i]->error < 300) { 
          result->add_property(path, instructions[i]->property_name, 
                               answer); 
        } else { 
          result->add_property(path, instructions[i]->property_name, 
                               results[i]); 
        } 
      } 
      properties->unroll(); 
    } else { 
      int i; 
      for(i = 0; i < sizeof(results); i++) { 
        result->add_property(path, instructions[i]->property_name, 
                             results[i]); 
      } 
      properties->commit(); 
    } 
  } 
 
  return 0; 
} 
 
//! Convenience variant of @[patch_properties()] that sets a single 
//! property: The default implementation calls 
//! @[PropertySet::start()], @[PropertySet::set_property()], 
//! @[PropertySet::unroll()] and @[PropertySet::commit()] as appropriate. 
//! 
//! @returns 
//!   Returns a mapping on any error, zero otherwise. 
mapping(string:mixed) set_single_property (string path, string prop_name, 
                                           string|array(Parser.XML.Tree.Node) value, 
                                           RequestID id) 
{ 
  PropertySet properties = query_properties(path, id); 
  if (!properties) return Roxen.http_status(Protocols.HTTP.HTTP_NOT_FOUND, 
                                            "File not found."); 
 
  mapping(string:mixed) result = properties->start(); 
  if (result) return result; 
 
  result = properties->set_property(prop_name, value); 
  if (result && result->error >= 300) 
    properties->unroll(); 
  else 
    properties->commit(); 
  return result; 
} 
 
//! Convenience variant of @[patch_properties()] that removes a single 
//! property. 
//! 
//! @returns 
//!   Returns a mapping on any error, zero otherwise. 
mapping(string:mixed) remove_single_property (string path, string prop_name, 
                                              RequestID id) 
{ 
  PropertySet properties = query_properties(path, id); 
  if (!properties) return Roxen.http_status(Protocols.HTTP.HTTP_NOT_FOUND, 
                                            "File not found."); 
 
  mapping(string:mixed) result = properties->start(); 
  if (result) return result; 
 
  result = properties->remove_property(prop_name); 
  if (result && result->error >= 300) 
    properties->unroll(); 
  else 
    properties->commit(); 
  return result; 
} 
 
mapping(string:mixed)|int(-1..0)|Stdio.File find_file(string path, 
                                                      RequestID id); 
 
//! Delete the file specified by @[path]. 
//! 
//! @note 
//!   Should return a 204 status on success. 
//! 
//! @note 
//!   The default implementation falls back to @[find_file()]. 
mapping(string:mixed) delete_file(string path, RequestID id) 
{ 
  // Fall back to find_file(). 
  RequestID tmp_id = id->close_me(); 
  tmp_id->not_query = query_location() + "/" + path; 
  tmp_id->method = "DELELE"; 
  // FIXME: Logging? 
  return find_file(path, id) || Roxen.http_status(404); 
} 
 
int(0..1) recurse_delete_files(string path, MultiStatus stat, RequestID id) 
{ 
  Stat st = stat_file(path, id); 
  if (!st) return 0; 
  if (st->isdir) { 
    // RFC 2518 8.6.2 
    //   The DELETE operation on a collection MUST act as if a 
    //   "Depth: infinity" header was used on it. 
    int(0..1) fail; 
    foreach(find_dir(path, id) || ({}), string fname) { 
      fail |= recurse_delete_files(path+"/"+fname, stat, id); 
    } 
    // RFC 2518 8.6.2 
    //   424 (Failed Dependancy) errors SHOULD NOT be in the 
    //   207 (Multi-Status). 
    if (fail) return fail; 
  } 
  mapping ret = delete_file(path, id); 
  if (ret->code != 204) { 
    // RFC 2518 8.6.2 
    //   Additionally 204 (No Content) errors SHOULD NOT be returned 
    //   in the 207 (Multi-Status). The reason for this prohibition 
    //   is that 204 (No COntent) is the default success code. 
    stat->add_response(path, XMLStatusNode(ret->code)); 
  } 
  return ret->code >= 300; 
} 
 
mapping copy_file(string path, string dest, int(-1..1) behavior, RequestID id) 
{ 
  werror("copy_file(%O, %O, %O, %O)\n", 
         path, dest, behavior, id); 
  return Roxen.http_status (Protocols.HTTP.HTTP_NOT_IMPL); 
} 
 
void recurse_copy_files(string path, int depth, string dest_prefix, 
                        string dest_suffix, 
                        mapping(string:int(-1..1)) behavior, 
                        MultiStatus result, RequestID id) 
{ 
  Stat st = stat_file(path, id); 
  if (!st) return; 
  if (!dest_prefix) { 
    Standards.URI dest_uri = Standards.URI(result->href_prefix); 
    Configuration c = roxen->find_configuration_for_url(dest_uri, id->conf); 
    // FIXME: Mounting server on subpath. 
    if (!c || 
        !has_prefix(dest_uri->path||"/", query_location())) { 
      // Destination is not local to this module. 
      // FIXME: Not supported yet. 
      result->add_response(dest_suffix, XMLStatusNode(502)); 
      return; 
    } 
    dest_prefix = (dest_uri->path||"/")[sizeof(query_location())..]; 
    Stat dest_st; 
    if (!(dest_st = stat_file(combine_path(dest_prefix, ".."), id)) || 
        !(dest_st->isdir)) { 
      result->add_response("", XMLStatusNode(409)); 
      return; 
    } 
    if (combine_path(dest_prefix, dest_suffix, ".") == 
        combine_path(path, ".")) { 
      result->add_response(dest_suffix, XMLStatusNode(403, "Source and destination are the same.")); 
      return; 
    } 
  } 
  werror("recurse_copy_files(%O, %O, %O, %O, %O, %O, %O)\n", 
         path, depth, dest_prefix, dest_suffix, behavior, result, id); 
  mapping res = copy_file(path, dest_prefix + dest_suffix, 
                          behavior[dest_prefix + dest_suffix]||behavior[0], 
                          id); 
  result->add_response(dest_suffix, XMLStatusNode(res->error, res->data)); 
  if (res->error >= 300) { 
    // RFC 2518 8.8.3 and 8.8.8 (error minimization). 
    return; 
  } 
  if ((depth <= 0) || !st->isdir) return; 
  depth--; 
  foreach(find_dir(path, id), string filename) { 
    recurse_copy_files(combine_path(path, filename), depth, 
                       dest_prefix, combine_path(dest_suffix, filename), 
                       behavior, result, id); 
  } 
} 
 
string real_file(string f, RequestID id){} 
 
void add_api_function( string name, function f, void|array(string) types) 
{ 
  _api_functions[name] = ({ f, types }); 
} 
 
mapping api_functions() 
{ 
  return _api_functions; 
} 
 
#if ROXEN_COMPAT <= 1.4 
mapping(string:function) query_tag_callers() 
//! Compat 
{ 
  mapping(string:function) m = ([]); 
  foreach(glob("tag_*", indices( this_object())), string q) 
    if(functionp( this_object()[q] )) 
      m[replace(q[4..], "_", "-")] = this_object()[q]; 
  return m; 
} 
 
mapping(string:function) query_container_callers() 
//! Compat 
{ 
  mapping(string:function) m = ([]); 
  foreach(glob("container_*", indices( this_object())), string q) 
    if(functionp( this_object()[q] )) 
      m[replace(q[10..], "_", "-")] = this_object()[q]; 
  return m; 
} 
#endif 
 
mapping(string:array(int|function)) query_simpletag_callers() 
{ 
  mapping(string:array(int|function)) m = ([]); 
  foreach(glob("simpletag_*", indices(this_object())), string q) 
    if(functionp(this_object()[q])) 
      m[replace(q[10..],"_","-")] = 
        ({ intp (this_object()[q + "_flags"]) && this_object()[q + "_flags"], 
           this_object()[q] }); 
  return m; 
} 
 
mapping(string:array(int|function)) query_simple_pi_tag_callers() 
{ 
  mapping(string:array(int|function)) m = ([]); 
  foreach (glob ("simple_pi_tag_*", indices (this_object())), string q) 
    if (functionp (this_object()[q])) 
      m[replace (q[sizeof ("simple_pi_tag_")..], "_", "-")] = 
        ({(intp (this_object()[q + "_flags"]) && this_object()[q + "_flags"]) | 
          RXML.FLAG_PROC_INSTR, this_object()[q]}); 
  return m; 
} 
 
RXML.TagSet query_tag_set() 
{ 
  if (!module_tag_set) { 
    array(function|program|object) tags = 
      filter (rows (this_object(), 
                    glob ("Tag*", indices (this_object()))), 
              lambda(mixed x) { return functionp(x)||programp(x); }); 
    for (int i = 0; i < sizeof (tags); i++) 
      if (programp (tags[i])) 
        if (!tags[i]->is_RXML_Tag) tags[i] = 0; 
        else tags[i] = tags[i](); 
      else { 
        tags[i] = tags[i](); 
        // Bogosity: The check is really a little too late here.. 
        if (!tags[i]->is_RXML_Tag) tags[i] = 0; 
      } 
    tags -= ({0}); 
    module_tag_set = 
      (this_object()->ModuleTagSet || RXML.TagSet) (this_object(), "", tags); 
  } 
  return module_tag_set; 
} 
 
mixed get_value_from_file(string path, string index, void|string pre) 
{ 
  Stdio.File file=Stdio.File(); 
  if(!file->open(path,"r")) return 0; 
  if(has_suffix(index, "()")) 
    index = index[..sizeof(index) - 3]; 
 
  //  Pass path to original file so that include statements for local files 
  //  work correctly. 
  return compile_string((pre || "") + file->read(), path)[index]; 
} 
 
static private mapping __my_tables = ([]); 
 
array(mapping(string:mixed)) sql_query( string query, mixed ... args ) 
//! Do a SQL-query using @[get_my_sql], the table names in the query 
//! should be written as &table; instead of table. As an example, if 
//! the tables 'meta' and 'data' have been created with create_tables 
//! or get_my_table, this query will work: 
//! 
//! SELECT &meta;.id AS id, &data;.data as DATA 
//!        FROM &data;, &meta; WHERE &my.meta;.xsize=200 
//! 
{ 
  return get_my_sql()->query( replace( query, __my_tables ), @args ); 
} 
 
object sql_big_query( string query, mixed ... args ) 
//! Identical to @[sql_query], but the @[Sql.sql()->big_query] method 
//! will be used instead of the @[Sql.sql()->query] method. 
{ 
  return get_my_sql()->big_query( replace( query, __my_tables ), @args ); 
} 
 
array(mapping(string:mixed)) sql_query_ro( string query, mixed ... args ) 
//! Do a read-only SQL-query using @[get_my_sql], the table names in the query 
//! should be written as &table; instead of table. As an example, if 
//! the tables 'meta' and 'data' have been created with create_tables 
//! or get_my_table, this query will work: 
//! 
//! SELECT &meta;.id AS id, &data;.data as DATA 
//!        FROM &data;, &meta; WHERE &my.meta;.xsize=200 
//! 
{ 
  return get_my_sql(1)->query( replace( query, __my_tables ), @args ); 
} 
 
object sql_big_query_ro( string query, mixed ... args ) 
//! Identical to @[sql_query_ro], but the @[Sql.sql()->big_query] method 
//! will be used instead of the @[Sql.sql()->query] method. 
{ 
  return get_my_sql(1)->big_query( replace( query, __my_tables ), @args ); 
} 
 
static int create_sql_tables( mapping(string:array(string)) definitions, 
                              string|void comment, 
                              int|void no_unique_names ) 
//! Create multiple tables in one go. See @[get_my_table] 
//! Returns the number of tables that were actually created. 
{ 
  int ddc; 
  if( !no_unique_names ) 
    foreach( indices( definitions ), string t ) 
      ddc+=get_my_table( t, definitions[t], comment, 1 ); 
  else 
  { 
    Sql.Sql sql = get_my_sql(); 
    foreach( indices( definitions ), string t ) 
    { 
      if( !catch { 
        sql->query("CREATE TABLE "+t+" ("+definitions[t]*","+")" ); 
      } ) 
        ddc++; 
      DBManager.is_module_table( this_object(), my_db, t, comment ); 
    } 
  } 
  return ddc; 
} 
 
static string sql_table_exists( string name ) 
//! Return the real name of the table 'name' if it exists. 
{ 
  if(strlen(name)) 
    name = "_"+name; 
   
  string res = hash(_my_configuration->name)->digits(36) 
    + "_" + replace(sname(),"#","_") + name; 
 
  return catch(get_my_sql()->query( "SELECT * FROM "+res+" LIMIT 1" ))?0:res; 
} 
 
 
static string|int get_my_table( string|array(string) name, 
                                void|array(string)|string defenition, 
                                string|void comment, 
                                int|void flag ) 
//! @decl string get_my_table( string name, array(string) types ) 
//! @decl string get_my_table( string name, string defenition ) 
//! @decl string get_my_table( string defenition ) 
//! @decl string get_my_table( array(string) defenition ) 
//! 
//! Returns the name of a table in the 'shared' database that is 
//! unique for this module. It is possible to select another database 
//! by using @[set_my_db] before calling this function. 
//! 
//! You can use @[create_sql_tables] instead of this function if you want 
//! to create more than one table in one go. 
//!  
//! If @[flag] is true, return 1 if a table was created, and 0 otherwise. 
//!  
//! In the first form, @[name] is the (postfix of) the name of the 
//! table, and @[types] is an array of definitions, as an example: 
//! 
//!  
//! @code{ 
//!   cache_table = get_my_table( "cache", ({ 
//!               "id INT UNSIGNED AUTO_INCREMENT", 
//!               "data BLOB", 
//!               }) ); 
//! @} 
//! 
//! In the second form, the whole table defenition is instead sent as 
//! a string. The cases where the name is not included (the third and 
//! fourth form) is equivalent to the first two cases with the name "" 
//! 
//! If the table does not exist in the datbase, it is created. 
//! 
//! @note 
//!   This function may not be called from create 
// 
// If it exists, but it's defenition is different, the table will be 
// altered with a ALTER TABLE call to conform to the defenition. This 
// might not work if the database the table resides in is not a MySQL 
// database (normally it is, but it's possible, using @[set_my_db], 
// to change this). 
{ 
  string oname; 
  int ddc; 
  if( !defenition ) 
  { 
    defenition = name; 
    oname = name = ""; 
  } 
  else if(strlen(name)) 
    name = "_"+(oname = name); 
 
  Sql.Sql sql = get_my_sql(); 
 
  string res = hash(_my_configuration->name)->digits(36) 
    + "_" + replace(sname(),"#","_") + name; 
 
  if( !sql ) 
  { 
    report_error("Failed to get SQL handle, permission denied for "+my_db+"\n"); 
    return 0; 
  } 
  if( arrayp( defenition ) ) 
    defenition *= ", "; 
   
  if( catch(sql->query( "SELECT * FROM "+res+" LIMIT 1" )) ) 
  { 
    ddc++; 
    mixed error = 
      catch 
      { 
        get_my_sql()->query( "CREATE TABLE "+res+" ("+defenition+")" ); 
        DBManager.is_module_table( this_object(), my_db, res, 
                                   oname+"\0"+comment ); 
      }; 
    if( error ) 
    { 
      if( strlen( name ) ) 
        name = " "+name; 
      report_error( "Failed to create table"+name+": "+ 
                    describe_error( error ) ); 
      return 0; 
    } 
    if( flag ) 
    { 
      __my_tables[ "&"+oname+";" ] = res; 
      return ddc; 
    } 
    return __my_tables[ "&"+oname+";" ] = res; 
  } 
//   // Update defenition if it has changed. 
//   mixed error =  
//     catch 
//     { 
//       get_my_sql()->query( "ALTER TABLE "+res+" ("+defenition+")" ); 
//     }; 
//   if( error ) 
//   { 
//     if( strlen( name ) ) 
//       name = " for "+name; 
//     report_notice( "Failed to update table defenition"+name+": "+ 
//               describe_error( error ) ); 
//   } 
  if( flag ) 
  { 
    __my_tables[ "&"+oname+";" ] = res; 
    return ddc; 
  } 
  return __my_tables[ "&"+oname+";" ] = res; 
} 
 
static string my_db = "local"; 
 
static void set_my_db( string to ) 
//! Select the database in which tables will be created with 
//! get_my_table, and also the one that will be returned by 
//! @[get_my_sql] 
{ 
  my_db = to; 
} 
 
Sql.Sql get_my_sql( int|void read_only ) 
//! Return a SQL-object for the database set with @[set_my_db], 
//! defaulting to the 'shared' database. If read_only is specified, 
//! the database will be opened in read_only mode. 
//!  
//! See also @[DBManager.get] 
{ 
  return DBManager.cached_get( my_db, _my_configuration, read_only ); 
}