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psyced/world/net/group/slave.c
2009-03-04 00:40:26 +01:00

270 lines
7 KiB
C

// vim:foldmethod=marker:syntax=lpc:noexpandtab
// $Id: slave.c,v 1.59 2008/04/22 22:43:56 lynx Exp $
//
// generic context slave as described in a posting to psyc-dev years ago.
// it receives the single copy of a message sent out by the group master
// and fans it out to local recipients. that's why local recipients need
// to create and join this manager when they enter a room.
//
// local debug messages - turn them on by using psyclpc -DDcontext=<level>
#ifdef Dcontext
# undef DEBUG
# define DEBUG Dcontext
#endif
#include <net.h>
#include <presence.h>
#ifdef PERSISTENT_SLAVES
# define PARANOID_PERSISTENT_SLAVES
# include <uniform.h>
inherit NET_PATH "storage";
private volatile string _file;
private string *_save_members;
private string _name;
private int _revision = -1;
#endif
#ifdef CONTEXT_STATE
private volatile mapping cast_state;
private volatile mapping temp_state;
inherit NET_PATH "state";
#endif
private volatile mapping _members;
void create() {
unless(mappingp(_members)) _members = ([ ]);
#ifdef CONTEXT_STATE
unless(mappingp(cast_state)) cast_state = ([ ]);
unless(mappingp(temp_state)) temp_state = ([ ]);
#endif
}
#ifdef PERSISTENT_SLAVES
varargs void load(string context, array(mixed) u) {
string dir = DATA_PATH "slaves/";
string entity;
unless (u) u = parse_uniform(context);
dir += u[UHost];
if (u[UPort]) dir += "-"+ u[UPort];
mkdir(dir); // make sure that directory exists
_name = context;
entity = u[UUser] || u[UResource];
_file = dir +"/"+ (entity? sha1(entity): "_");
::load(_file);
foreach (string m : _save_members) {
object o = summon_person(m[1..]);
_members[o] = m;
}
P4(("loaded cslave %O with %O\n", _name, _members))
}
protected save() {
P4(("cslave:save() %O\n", _members))
unless (_file) return;
if (sizeof(_members) == 0) {
rm(_file);
_revision = -1;
// FIXME: could clean up directory if it is empty
} else {
_save_members = m_values(_members);
::save(_file);
}
}
# ifndef PARANOID_PERSISTENT_SLAVES
remove() {
if (_file) save(_file);
}
reset() {
if (_file) save(_file);
}
# endif
#endif
void insert_member(mixed member, mixed origin, mixed data) {
P4(("%O enters cslave\n", member))
// we use the values from the members mapping as counters
// for their individual psyc-state
#ifdef PERSISTENT_SLAVES
_members[member] = member->psycName();
#else
_members[member] = 0;
#endif
#ifdef CONTEXT_STATE
if (stringp(member)) {
mapping v = ([ ]);
// this is not how we do it
// foreach(string key, mixed value : cast_state)
// v["="+key] = value;
// no var ops embedded in sendmsg.
sendmsg(member, 0, 0, v + ([ "_context" : ME , "_target" : member ]));
}
#endif
#ifdef PARANOID_PERSISTENT_SLAVES
// paranoid slaves
save();
#endif
}
void remove_member(mixed member, mixed origin) {
PT(("%O leaves context slave\n", member))
m_delete(_members, member);
#ifdef PARANOID_PERSISTENT_SLAVES
save();
#endif
}
#ifdef FORK
msg(source, method, data, mapping vars) {
#else
castmsg(source, method, data, mapping vars) {
#endif
/*
* implement group manager logic
* and fan out everything else?
* fan out could happen here and group manager handled by
* higher level objects
*/
mixed o;
#ifdef XMPPERIMENTAL
PT(("%O group slave _routes is %O\n", ME, _members))
#else
P3(("%O group slave msg(%O, %O, ...)\n", ME, source, method))
#endif
#ifdef CACHE_PRESENCE
// before lynX starts complaining:
// we could cache the presenity value here
if (vars["_degree_availability"])
persistent_presence(source, vars["_degree_availability"]);
//, vars["_degree_mood"]);
# if 0 // else? why should we have presence without _degree_availability ?
else switch(method) {
case "_notice_presence_here":
persistent_presence(source, AVAILABILITY_HERE);
break;
case "_notice_presence_here_busy":
persistent_presence(source, AVAILABILITY_BUSY);
break;
case "_notice_presence_away":
case "_notice_presence_away_manual":
case "_notice_presence_away_automatic":
persistent_presence(source, AVAILABILITY_AWAY);
break;
case "_notice_presence_absent_vacation":
persistent_presence(source, AVAILABILITY_VACATION);
break;
case "_notice_presence_absent":
persistent_presence(source, AVAILABILITY_OFFLINE);
break;
}
# endif
#endif
#ifdef PERSISTENT_SLAVES
/* the lazy update strategy */
if (vars["_number_revision"] && !intp(vars["_number_revision"]))
vars["_number_revision"] = to_int(vars["_number_revision"]);
if (vars["_number_revision"] && _revision != vars["_number_revision"]) {
int delta;
/* initialize */
if (_revision == -1) {
_revision = vars["_number_revision"];
} else {
delta = vars["_number_revision"] - _revision;
/* counter increment */
if (delta == 1) {
_revision = vars["_number_revision"];
} else if (delta > 1 || delta < 1) {
P0(("warning: %O revision mismatch! have %O, master has %O, delta is %d\n",
_name, _revision, vars["_number_revision"], delta))
monitor_report("_failure_slave_revision",
object_name(ME) +" · "+ sprintf("revision mismatch with delta %d", delta));
// TODO
// for now, we just log and accept those
_revision = vars["_number_revision"];
}
}
}
if (vars["_number_revision"] > 0) {
PT(("%O (%s) counter revision is %O\n", ME, method, vars["_number_revision"]))
}
m_delete(vars, "_number_revision");
#endif
foreach(o : _members) {
if (objectp(o))
#ifdef CONTEXT_STATE
// may need copy(vars) also
o -> msg(source, method, data, cast_state + vars );
else
sendmsg(o, method, data, vars + temp_state, source);
#else
o -> msg(source, method, data, copy(vars));
else
sendmsg(o, method, data, vars, source);
#endif
/* if one or more of our local users have joined this
* place, we trust the place and allow it to use us as
* a relay for people who are topologically close to us.
* that's how remote users may end up in this structure, too.
*/
}
#ifdef CONTEXT_STATE
temp_state = ([ ]);
#endif
return 1;
}
#ifdef CONTEXT_STATE // {{{
// This won't work ... we have to have _one_ single cast-state
// which is synced with objects entering the context..
//
// TODO
void Reset(mixed source) {
cast_state = ([ ]);
foreach(mixed o : _members) {
unless (objectp(o))
sendmsg(o, 0, 0, ([ "_count" : _members[o] = 0 ]), source);
}
}
void Assign(mixed source, string key, mixed value) {
// we have to check here for source == our context
// + we expect msg to be called between state-changes from different
// packets to reset temp_state
if (stringp(value) && value == "" )
m_delete(cast_state, key);
else
cast_state[key] = value;
temp_state["="+key] = value;
}
void Augment(mixed source, string key, mixed value) {
_augment(cast_state, key, value);
_augment(temp_state, "+"+key, value);
}
void Diminish(mixed source, string key, mixed value) {
int i;
_diminish(cast_state, key, value);
if (member(temp_state, "-"+key)) {
PT(("PANIC! Received list-diminish as a list!"))
} else temp_state["-"+key] = value;
}
#endif // }}}