error_handler.c

/*
  
(Date unknown) - Jezu@Astaria
Added error_handler() during porting to FluffOS

July 10, 2022 - Jezu@Astaria
- Refactored error_handler().
- Fixed bug in error_handler() that was incorrectly applying verbose_errors.
- Changed debug class for errors generated by wizards to be ':<wiz name>'.  This is so wizzes can selectively enable which wizards they want to receive errors for.

*/

#include <uid.h>
#include <ansi.h>

#define OUTPUT ([ \
  "file" : 0,\
  "line" : 1,\
  "program" : 2,\
  "trace" : 3,\
  "error" : 4,\
  "arguments" : 5,\
  "object" : 6,\
  "interactive" : 7,\
  "context" : 8,\
  "function" : 9,\
  "locals" : 10\
])

class Error {
  string file;
  int line;
  string program;
  mapping trace;
  string error;
  mixed *args;
  object ob;
  mixed interactive;
  string uid;
  string func;
  mixed *locals;
}

class Output {
  string file;
  string line;
  string program;
  string trace;
  string error;
  string arguments;
  string ob;
  string interactive;
  string context;
  string func;
  string locals;
}

class Error err;
class Output out;

nosave int has_error = 0;
nosave string last_error = "";

public string clear_last_error() {
  last_error = "";
}

public string get_last_error() {
  return last_error;
}

protected void error_handler(mapping map, int flag) {
  string str, debug_class, file_lines, border, o;
  function f;
  mapping enabled_categories;
  
  out = new(class Output);
  err = new(class Error);
  
  err->file        = (string)map["file"];
  err->line        = (int)map["line"];
  err->ob          = (object)map["object"];
  err->program     = (string)map["program"];
  err->trace       = (mixed*)map["trace"];
  if ( arrayp(err->trace) && mapp(err->trace[<1]) )
  {
    err->func        = err->trace[<1]["function"];
    err->args        = err->trace[<1]["arguments"];
    err->locals      = err->trace[<1]["locals"];
  }
  err->error       = (string)map["error"];
  err->interactive = this_interactive() || this_player();
  
  debug_class = "debug/";
  border = repeat_string("-", 60);
  
  str = sprintf("\n%s\n%s\n\n", border, ctime());
  
  if (flag)
    str += "*Error caught\n\n";
  
  f = function(string s, mixed m){
    return sprintf("\n%s%14s:%s %s", HIW, s, NOR, identify(m));
  };
  
  str += (*f)("Error", err->error[0..-2]);
  
  if ( objectp(err->interactive) )
  {
    err->uid = getuid(err->interactive);
    out->interactive = (*f)("Interactive", err->uid);
  }
    
  out->ob = (*f)("Object", err->ob);
  out->program = (*f)("Program", err->program);
  out->func = (*f)("Function", err->func);
  out->arguments = (*f)("Arguments", err->args);
  out->file = (*f)("File", err->file);
  out->line = (*f)("Line", err->line);
 
  out->trace = sprintf("\n\n\n%sTrace:%s\n\n%s", HIW, NOR,
      implode( 
        map_array( 
          err->trace,
          (: sprintf("Line: %O File: %O Function: %O Object: %O Program: %O", 
               (int)$1["line"], 
               (string)$1["file"], 
               (string)$1["function"], 
               (object)$1["object"] || "No object", 
               (string)$1["program"] || "No program") :)
        ), "\n"));
        
  last_error = str;

  if ( objectp(err->interactive) && wizardp(err->interactive) )
  {
    debug_class += ":"+err->uid;
    write_file( sprintf("%sdebug.log", user_path(err->uid)), str);
  }  
  else
  {
    debug_class += "master";
    write_file("/log/debug.log", str);	 
  }
  
  f = function(int offset, int count) {
    string lines = read_file( err->file, err->line+offset, count);
    string s = "";
    
    if ( !offset )
      s = sprintf("%s%d:%s  %s", HIR, err->line, NOR, lines);
    else
      foreach (string line in explode(lines, "\n"))
        s += sprintf("%d:  %s\n", err->line+offset++, line);

    return s; 
  };
  
  out->context  = sprintf("\n\n\n%sContext:%s\n\n%s%s%s", 
      HIW, 
      NOR,
      (*f)(-3, 3),
      (*f)(0, 1),
      (*f)(1, 3));


  foreach(object wiz in wizards())
  {
    o = "";
    enabled_categories = (mapping)wiz->query("debug_categories") || ([]);
    foreach(string cat in (keys(enabled_categories)-({ "context", "trace" })))
    {
      if ( (int)enabled_categories[cat] )
        o += fetch_class_member(out, OUTPUT[cat]);
    }
    if ( enabled_categories["trace"] )
      o += fetch_class_member(out, OUTPUT["trace"]);
    if ( enabled_categories["context"] )
      o += fetch_class_member(out, OUTPUT["context"]);
    
    message(debug_class, sprintf("%s\n%s\n", str+o, border), wiz);
  }
}