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psyced/world/net/storage.c

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2009-01-26 20:12:53 +00:00
// $Id: storage.c,v 1.26 2008/12/16 11:58:52 lynx Exp $ // vim:syntax=lpc
//
// common subclass for anything that uses persistent data storage
//
// using only one mapping for less backwards compatibility problems
#include <net.h>
#include <errno.h>
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// should you like to do a completely different implementation of
// net/storage, just #define _implementation_net_storage in local.h
// to point to it
#ifdef _implementation_net_storage
# include _implementation_net_storage
#else
#ifndef STORAGE_SQL_OBJECT
# ifdef STORAGE_SQLITE
# define STORAGE_SQL_OBJECT DAEMON_PATH "sqlite"
# elif defined(STORAGE_MYSQL)
# define STORAGE_SQL_OBJECT DAEMON_PATH "mysql"
# endif
#endif
#ifdef STORAGE_SQL_OBJECT
volatile object sqlob = load_object(STORAGE_SQL_OBJECT);
#endif
protected mapping _v;
vInit() { _v = ([]); }
v(k, c) {
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// happens in net/irc/common .. you should generally avoid this
P2(("->v(%O) method used in %O\n", k, ME))
if (c) _v[k] = c;
return _v[k];
}
vQuery(k, c) {
D2( if (c) raise_error("second arg in vQuery given\n"); )
// D2(if(!_v) raise_error("storage not initialized\n"); )
if (mappingp(_v)) return _v[k];
}
vSet(k, c) {
P3(("%O->vSet(%O,%O)\n", ME, k, k == "log" ? "<log>" : c))
D1( if (!c) D(S("vSet w/out value from %O into %O->vSet(%O,%O)\n",
previous_object(), ME, k,c));)
// D1( if (!c) raise_error("second arg in vSet not given ("+c+")\n"); )
D2( if(!_v) raise_error("storage not initialized\n"); )
return _v[k] = c;
}
vDel(k) {
P3(("%O->vDel(%O)\n", ME, k))
_v = m_delete(_v, k);
}
vAppend(k, c) { return _v[k] += c; }
// used by msg() in user.c
vInc(k, howmuch) {
unless (howmuch) howmuch = 1;
if (member(_v,k)) return _v[k] += howmuch;
else return _v[k] = howmuch;
}
// vDec(k) { _v[k]--; }
vExist(k) {
return member(_v, k);
}
vEmpty() { return sizeof(_v) == 0; }
vSize() { return sizeof(_v); }
// this is supposed to be a read-only access
// for performance the mapping returned is currently writeable
// never (ab)use this!
//
vMapping() { return _v; }
vMerge(mapping vars) { _v += vars; }
// in case of future extension..
protected load(file) {
int e;
P2(("LOAD %O <= %O\n", ME, file))
/* WARNING
* THIS IS ABSOLUTELY EXPERIMENTAL
* and abuses the sync, blocking implementations of mysql and sqlite
*/
#if defined(STORAGE_SQLITE) || defined(STORAGE_MYSQL)
// restore _v and _log (in theory, _log would have to be initialized
// in lastlog.c
// TODO: should place and person overload their storage init?
if (abbrev(DATA_PATH "person/", file)) {
string who;
mixed res;
who = file[strlen(DATA_PATH) + 7..]; // + 7 -> "person/"
/* put your query for loading _v here */
// slightly different syntaxes, eh?
# ifdef STORAGE_SQLITE
res = sqlob->query("SELECT "
"`_nick`, `_password`, `_prehash` "
"FROM `person` "
"WHERE `_nick` = '%s' LIMIT 1", who);
# elif defined(STORAGE_MYSQL)
res = sqlob->query("SELECT "
"`_nick`, `_password`, `_prehash` "
"FROM `person` "
"WHERE `_nick` = '%s' LIMIT 1", who);
# endif
unless(res && !intp(res) && sizeof(res)) return; // no userdata
res = res[0];
/* currently, we use the same logic for building _v from
* the sql result
*/
_v["nick"] = res[0];
_v["password"] = res[1];
_v["prehash"] = res[2];
/* now the logic for loading _log */
logInit();
return;
}
# if 0
} else if (abbrev(DATA_PATH "place/", file)) {
sl_open(DATA_PATH "place-sqlite");
// restore _v and _log
# endif
#else
# if __EFUN_DEFINED__(errno)
errno(); // clear errno
if (restore_object(file)) return;
e = errno();
D1( if (e && e != ENOENT)
D(S("restore from %s returns %d\n", file, e )); )
return e ? e : -1;
# else
if (restore_object(file)) return;
return ENOENT;
# endif
#endif
}
protected save(file) {
#ifdef VOLATILE
P2(("VOLATILE NO SAVE %O => %O\n", ME, file))
#else
P2(("SAVE %O => %O\n", ME, file))
# if __EFUN_DEFINED__(errno)
int e;
errno(); // clear errno
# ifdef SAVE_FORMAT
save_object(file, SAVE_FORMAT);
# else
save_object(file);
# endif
e = errno();
D1( if (e && e != ENOENT) D("save in "+file+" returns "+e+"\n"); )
return e;
# else
# ifdef SAVE_FORMAT
save_object(file, SAVE_FORMAT);
# else
save_object(file);
# endif
return 0;
# endif
#endif
}
void create() { if (!_v && clonep(ME)) vInit(); }
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#endif // _implementation_net_storage