File: srvc_aware.c

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/*
  Meanwhile - Unofficial Lotus Sametime Community Client Library
  Copyright (C) 2004  Christopher (siege) O'Brien
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.
  
  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <glib.h>
#include <string.h>

#include "mw_channel.h"
#include "mw_debug.h"
#include "mw_error.h"
#include "mw_message.h"
#include "mw_service.h"
#include "mw_session.h"
#include "mw_srvc_aware.h"
#include "mw_util.h"


struct mwServiceAware {
  struct mwService service;

  struct mwAwareHandler *handler;

  /** map of ENTRY_KEY(aware_entry):aware_entry */
  GHashTable *entries;

  /** set of guint32:attrib_watch_entry attribute keys */
  GHashTable *attribs;

  /** collection of lists of awareness for this service. Each item is
      a mwAwareList */
  GList *lists;

  /** the buddy list channel */
  struct mwChannel *channel;
};


struct mwAwareList {

  /** the owning service */
  struct mwServiceAware *service;

  /** map of ENTRY_KEY(aware_entry):aware_entry */
  GHashTable *entries;

  /** set of guint32:attrib_watch_entry attribute keys */
  GHashTable *attribs;

  struct mwAwareListHandler *handler;
  struct mw_datum client_data;
};


struct mwAwareAttribute {
  guint32 key;
  struct mwOpaque data;
};


struct attrib_entry {
  guint32 key;
  GList *membership;
};


/** an actual awareness entry, belonging to any number of aware lists */
struct aware_entry {
  struct mwAwareSnapshot aware;

  /** list of mwAwareList containing this entry */
  GList *membership;

  /** collection of attribute values for this entry.
      map of ATTRIB_KEY(mwAwareAttribute):mwAwareAttribute */
  GHashTable *attribs;
};


#define ENTRY_KEY(entry) &entry->aware.id


/** the channel send types used by this service */
enum msg_types {
  msg_AWARE_ADD       = 0x0068,  /**< remove an aware */
  msg_AWARE_REMOVE    = 0x0069,  /**< add an aware */

  msg_OPT_DO_SET      = 0x00c9,  /**< set an attribute */
  msg_OPT_DO_UNSET    = 0x00ca,  /**< unset an attribute */
  msg_OPT_WATCH       = 0x00cb,  /**< set the attribute watch list */

  msg_AWARE_SNAPSHOT  = 0x01f4,  /**< recv aware snapshot */
  msg_AWARE_UPDATE    = 0x01f5,  /**< recv aware update */
  msg_AWARE_GROUP     = 0x01f6,  /**< recv group aware */

  msg_OPT_GOT_SET     = 0x0259,  /**< recv attribute set update */
  msg_OPT_GOT_UNSET   = 0x025a,  /**< recv attribute unset update */

  msg_OPT_GOT_UNKNOWN = 0x025b,  /**< UNKNOWN */
  
  msg_OPT_DID_SET     = 0x025d,  /**< attribute set response */
  msg_OPT_DID_UNSET   = 0x025e,  /**< attribute unset response */
  msg_OPT_DID_ERROR   = 0x025f,  /**< attribute set/unset error */
};


static void aware_entry_free(struct aware_entry *ae) {
  mwAwareSnapshot_clear(&ae->aware);
  g_list_free(ae->membership);
  g_hash_table_destroy(ae->attribs);
  g_free(ae);
}


static void attrib_entry_free(struct attrib_entry *ae) {
  g_list_free(ae->membership);
  g_free(ae);
}


static void attrib_free(struct mwAwareAttribute *attrib) {
  mwOpaque_clear(&attrib->data);
  g_free(attrib);
}


static struct aware_entry *aware_find(struct mwServiceAware *srvc,
				      struct mwAwareIdBlock *srch) {
  g_return_val_if_fail(srvc != NULL, NULL);
  g_return_val_if_fail(srvc->entries != NULL, NULL);
  g_return_val_if_fail(srch != NULL, NULL);
  
  return g_hash_table_lookup(srvc->entries, srch);
}


static struct aware_entry *list_aware_find(struct mwAwareList *list,
					   struct mwAwareIdBlock *srch) {
  g_return_val_if_fail(list != NULL, NULL);
  g_return_val_if_fail(list->entries != NULL, NULL);
  g_return_val_if_fail(srch != NULL, NULL);

  return g_hash_table_lookup(list->entries, srch);
}


static void compose_list(struct mwPutBuffer *b, GList *id_list) {
  guint32_put(b, g_list_length(id_list));
  for(; id_list; id_list = id_list->next)
    mwAwareIdBlock_put(b, id_list->data);
}


static int send_add(struct mwChannel *chan, GList *id_list) {
  struct mwPutBuffer *b = mwPutBuffer_new();
  struct mwOpaque o;
  int ret;

  g_return_val_if_fail(chan != NULL, 0);

  compose_list(b, id_list);

  mwPutBuffer_finalize(&o, b);

  ret = mwChannel_send(chan, msg_AWARE_ADD, &o);
  mwOpaque_clear(&o);

  return ret;  
}


static int send_rem(struct mwChannel *chan, GList *id_list) {
  struct mwPutBuffer *b = mwPutBuffer_new();
  struct mwOpaque o;
  int ret;

  g_return_val_if_fail(chan != NULL, 0);

  compose_list(b, id_list);
  mwPutBuffer_finalize(&o, b);

  ret = mwChannel_send(chan, msg_AWARE_REMOVE, &o);
  mwOpaque_clear(&o);

  return ret;
}


static gboolean collect_dead(gpointer key, gpointer val, gpointer data) {
  struct aware_entry *aware = val;
  GList **dead = data;

  if(aware->membership == NULL) {
    g_info(" removing %s, %s",
	   NSTR(aware->aware.id.user), NSTR(aware->aware.id.community));
    *dead = g_list_append(*dead, aware);
    return TRUE;

  } else {
    return FALSE;
  }
}


static int remove_unused(struct mwServiceAware *srvc) {
  /* - create a GList of all the unused aware entries
     - remove each unused aware from the service
     - if the service is alive, send a removal message for the collected
     unused.
  */

  int ret = 0;
  GList *dead = NULL, *l;

  if(srvc->entries) {
    g_info("bring out your dead *clang*");
    g_hash_table_foreach_steal(srvc->entries, collect_dead, &dead);
  }
 
  if(dead) {
    if(MW_SERVICE_IS_LIVE(srvc))
      ret = send_rem(srvc->channel, dead) || ret;
    
    for(l = dead; l; l = l->next)
      aware_entry_free(l->data);

    g_list_free(dead);
  }

  return ret;
}


static int send_attrib_list(struct mwServiceAware *srvc) {
  struct mwPutBuffer *b;
  struct mwOpaque o;

  int tmp;
  GList *l;

  g_return_val_if_fail(srvc != NULL, -1);
  g_return_val_if_fail(srvc->channel != NULL, 0);

  l = map_collect_keys(srvc->attribs);
  tmp = g_list_length(l);

  b = mwPutBuffer_new();
  guint32_put(b, 0x00);
  guint32_put(b, tmp);
  
  for(; l; l = g_list_delete_link(l, l)) {
    guint32_put(b, GPOINTER_TO_UINT(l->data));
  }

  mwPutBuffer_finalize(&o, b);
  tmp = mwChannel_send(srvc->channel, msg_OPT_WATCH, &o);
  mwOpaque_clear(&o);

  return tmp;
}


static gboolean collect_attrib_dead(gpointer key, gpointer val,
				    gpointer data) {

  struct attrib_entry *attrib = val;
  GList **dead = data;

  if(attrib->membership == NULL) {
    g_info(" removing 0x%08x", GPOINTER_TO_UINT(key));
    *dead = g_list_append(*dead, attrib);
    return TRUE;

  } else {
    return FALSE;
  }
}


static int remove_unused_attrib(struct mwServiceAware *srvc) {
  GList *dead = NULL;

  if(srvc->attribs) {
    g_info("collecting dead attributes");
    g_hash_table_foreach_steal(srvc->attribs, collect_attrib_dead, &dead);
  }
 
  /* since we stole them, we'll have to clean 'em up manually */
  for(; dead; dead = g_list_delete_link(dead, dead)) {
    attrib_entry_free(dead->data);
  }

  return MW_SERVICE_IS_LIVE(srvc)? send_attrib_list(srvc): 0;
}


static void recv_accept(struct mwServiceAware *srvc,
			struct mwChannel *chan,
			struct mwMsgChannelAccept *msg) {

  g_return_if_fail(srvc->channel != NULL);
  g_return_if_fail(srvc->channel == chan);

  if(MW_SERVICE_IS_STARTING(MW_SERVICE(srvc))) {
    GList *list = NULL;

    list = map_collect_values(srvc->entries);
    send_add(chan, list);
    g_list_free(list);

    send_attrib_list(srvc);

    mwService_started(MW_SERVICE(srvc));

  } else {
    mwChannel_destroy(chan, ERR_FAILURE, NULL);
  }
}


static void recv_destroy(struct mwServiceAware *srvc,
			 struct mwChannel *chan,
			 struct mwMsgChannelDestroy *msg) {

  srvc->channel = NULL;
  mwService_stop(MW_SERVICE(srvc));

  /** @todo session sense service and mwService_start */
}


/** called from SNAPSHOT_recv, UPDATE_recv, and
    mwServiceAware_setStatus */
static void status_recv(struct mwServiceAware *srvc,
			struct mwAwareSnapshot *idb) {

  struct aware_entry *aware;
  GList *l;

  aware = aware_find(srvc, &idb->id);

  if(! aware) {
    /* we don't deal with receiving status for something we're not
       monitoring, but it will happen sometimes, eg from manually set
       status */
    return;
  }
  
  /* clear the existing status, then clone in the new status */
  mwAwareSnapshot_clear(&aware->aware);
  mwAwareSnapshot_clone(&aware->aware, idb);
  
  /* trigger each of the entry's lists */
  for(l = aware->membership; l; l = l->next) {
    struct mwAwareList *alist = l->data;
    struct mwAwareListHandler *handler = alist->handler;

    if(handler && handler->on_aware)
      handler->on_aware(alist, idb);
  }
}


static void attrib_recv(struct mwServiceAware *srvc,
			struct mwAwareIdBlock *idb,
			struct mwAwareAttribute *attrib) {

  struct aware_entry *aware;
  struct mwAwareAttribute *old_attrib = NULL;
  GList *l;
  guint32 key;
  gpointer k;

  aware = aware_find(srvc, idb);
  g_return_if_fail(aware != NULL);

  key = attrib->key;
  k = GUINT_TO_POINTER(key);

  if(aware->attribs)
    old_attrib = g_hash_table_lookup(aware->attribs, k);

  if(! old_attrib) {
    old_attrib = g_new0(struct mwAwareAttribute, 1);
    old_attrib->key = key;
    g_hash_table_insert(aware->attribs, k, old_attrib);
  }
  
  mwOpaque_clear(&old_attrib->data);
  mwOpaque_clone(&old_attrib->data, &attrib->data);
  
  for(l = aware->membership; l; l = l->next) {
    struct mwAwareList *list = l->data;
    struct mwAwareListHandler *h = list->handler;

    if(h && h->on_attrib &&
       list->attribs && g_hash_table_lookup(list->attribs, k))

      h->on_attrib(list, idb, old_attrib);
  }
}


static gboolean list_add(struct mwAwareList *list,
			 struct mwAwareIdBlock *id) {

  struct mwServiceAware *srvc = list->service;
  struct aware_entry *aware;

  g_return_val_if_fail(id->user != NULL, FALSE);
  g_return_val_if_fail(strlen(id->user) > 0, FALSE);

  if(! list->entries)
    list->entries = g_hash_table_new((GHashFunc) mwAwareIdBlock_hash,
				     (GEqualFunc) mwAwareIdBlock_equal);

  aware = list_aware_find(list, id);
  if(aware) return FALSE;

  aware = aware_find(srvc, id);
  if(! aware) {
    aware = g_new0(struct aware_entry, 1);
    aware->attribs = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL,
					   (GDestroyNotify) attrib_free);
    mwAwareIdBlock_clone(ENTRY_KEY(aware), id);

    g_hash_table_insert(srvc->entries, ENTRY_KEY(aware), aware);
  }

  aware->membership = g_list_append(aware->membership, list);

  g_hash_table_insert(list->entries, ENTRY_KEY(aware), aware);

  return TRUE;
}


static void group_member_recv(struct mwServiceAware *srvc,
			      struct mwAwareSnapshot *idb) {
  /* @todo
     - look up group by id
     - find each list group belongs to
     - add user to lists
  */

  struct mwAwareIdBlock gsrch = { mwAware_GROUP, idb->group, NULL };
  struct aware_entry *grp;
  GList *l, *m;

  grp = aware_find(srvc, &gsrch);
  g_return_if_fail(grp != NULL); /* this could happen, with timing. */

  l = g_list_prepend(NULL, &idb->id);

  for(m = grp->membership; m; m = m->next) {

    /* if we just list_add, we won't receive updates for attributes,
       so annoyingly we have to turn around and send out an add aware
       message for each incoming group member */

    /* list_add(m->data, &idb->id); */
    mwAwareList_addAware(m->data, l);
  }

  g_list_free(l);
}


static void recv_SNAPSHOT(struct mwServiceAware *srvc,
			  struct mwGetBuffer *b) {

  guint32 count;

  struct mwAwareSnapshot *snap;
  snap = g_new0(struct mwAwareSnapshot, 1);

  guint32_get(b, &count);

  while(count--) {
    mwAwareSnapshot_get(b, snap);

    if(mwGetBuffer_error(b)) {
      mwAwareSnapshot_clear(snap);
      break;
    }

    if(snap->group)
      group_member_recv(srvc, snap);

    status_recv(srvc, snap);
    mwAwareSnapshot_clear(snap);
  }

  g_free(snap);
}


static void recv_UPDATE(struct mwServiceAware *srvc,
			struct mwGetBuffer *b) {

  struct mwAwareSnapshot *snap;

  snap = g_new0(struct mwAwareSnapshot, 1);
  mwAwareSnapshot_get(b, snap);

  if(snap->group)
    group_member_recv(srvc, snap);

  if(! mwGetBuffer_error(b))
    status_recv(srvc, snap);

  mwAwareSnapshot_clear(snap);
  g_free(snap);
}


static void recv_GROUP(struct mwServiceAware *srvc,
		       struct mwGetBuffer *b) {

  struct mwAwareIdBlock idb = { 0, 0, 0 };

  /* really nothing to be done with this. The group should have
     already been added to the list and service, and is now simply
     awaiting a snapshot/update with users listed as belonging in said
     group. */

  mwAwareIdBlock_get(b, &idb);
  mwAwareIdBlock_clear(&idb);
}


static void recv_OPT_GOT_SET(struct mwServiceAware *srvc,
			     struct mwGetBuffer *b) {

  struct mwAwareAttribute attrib;
  struct mwAwareIdBlock idb;
  guint32 junk, check;

  guint32_get(b, &junk);
  mwAwareIdBlock_get(b, &idb);
  guint32_get(b, &junk);
  guint32_get(b, &check);
  guint32_get(b, &junk);
  guint32_get(b, &attrib.key);

  if(check) {
    mwOpaque_get(b, &attrib.data);
  } else {
    attrib.data.len = 0;
    attrib.data.data = NULL;
  }

  attrib_recv(srvc, &idb, &attrib);

  mwAwareIdBlock_clear(&idb);
  mwOpaque_clear(&attrib.data);
}


static void recv_OPT_GOT_UNSET(struct mwServiceAware *srvc,
			       struct mwGetBuffer *b) {

  struct mwAwareAttribute attrib;
  struct mwAwareIdBlock idb;
  guint32 junk;

  attrib.key = 0;
  attrib.data.len = 0;
  attrib.data.data = NULL;

  guint32_get(b, &junk);
  mwAwareIdBlock_get(b, &idb);
  guint32_get(b, &attrib.key);

  attrib_recv(srvc, &idb, &attrib);

  mwAwareIdBlock_clear(&idb);
}


static void recv(struct mwService *srvc, struct mwChannel *chan,
		 guint16 type, struct mwOpaque *data) {

  struct mwServiceAware *srvc_aware = (struct mwServiceAware *) srvc;
  struct mwGetBuffer *b;

  g_return_if_fail(srvc_aware->channel == chan);
  g_return_if_fail(srvc->session == mwChannel_getSession(chan));
  g_return_if_fail(data != NULL);

  b = mwGetBuffer_wrap(data);

  switch(type) {
  case msg_AWARE_SNAPSHOT:
    recv_SNAPSHOT(srvc_aware, b);
    break;

  case msg_AWARE_UPDATE:
    recv_UPDATE(srvc_aware, b);
    break;

  case msg_AWARE_GROUP:
    recv_GROUP(srvc_aware, b);
    break;

  case msg_OPT_GOT_SET:
    recv_OPT_GOT_SET(srvc_aware, b);
    break;

  case msg_OPT_GOT_UNSET:
    recv_OPT_GOT_UNSET(srvc_aware, b);
    break;

  case msg_OPT_GOT_UNKNOWN:
  case msg_OPT_DID_SET:
  case msg_OPT_DID_UNSET:
  case msg_OPT_DID_ERROR:
    break;

  default:
    mw_mailme_opaque(data, "unknown message in aware service: 0x%04x", type);
  }

  mwGetBuffer_free(b);  
}


static void clear(struct mwService *srvc) {
  struct mwServiceAware *srvc_aware = (struct mwServiceAware *) srvc;

  g_return_if_fail(srvc != NULL);

  while(srvc_aware->lists)
    mwAwareList_free( (struct mwAwareList *) srvc_aware->lists->data );

  g_hash_table_destroy(srvc_aware->entries);
  srvc_aware->entries = NULL;

  g_hash_table_destroy(srvc_aware->attribs);
  srvc_aware->attribs = NULL;
}


static const char *name(struct mwService *srvc) {
  return "Presence Awareness";
}


static const char *desc(struct mwService *srvc) {
  return "Buddy list service with support for server-side groups";
}


static struct mwChannel *make_blist(struct mwServiceAware *srvc,
				    struct mwChannelSet *cs) {

  struct mwChannel *chan = mwChannel_newOutgoing(cs);

  mwChannel_setService(chan, MW_SERVICE(srvc));
  mwChannel_setProtoType(chan, 0x00000011);
  mwChannel_setProtoVer(chan, 0x00030005);

  return mwChannel_create(chan)? NULL: chan;
}


static void start(struct mwService *srvc) {
  struct mwServiceAware *srvc_aware;
  struct mwChannel *chan = NULL;

  srvc_aware = (struct mwServiceAware *) srvc;
  chan = make_blist(srvc_aware, mwSession_getChannels(srvc->session));

  if(chan != NULL) {
    srvc_aware->channel = chan;
  } else {
    mwService_stopped(srvc);
  }
}


static void stop(struct mwService *srvc) {
  struct mwServiceAware *srvc_aware;

  srvc_aware = (struct mwServiceAware *) srvc;

  if(srvc_aware->channel) {
    mwChannel_destroy(srvc_aware->channel, ERR_SUCCESS, NULL);
    srvc_aware->channel = NULL;
  }

  mwService_stopped(srvc);
}


struct mwServiceAware *
mwServiceAware_new(struct mwSession *session,
		   struct mwAwareHandler *handler) {

  struct mwService *service;
  struct mwServiceAware *srvc;

  g_return_val_if_fail(session != NULL, NULL);
  g_return_val_if_fail(handler != NULL, NULL);

  srvc = g_new0(struct mwServiceAware, 1);
  srvc->handler = handler;
  srvc->entries = g_hash_table_new_full((GHashFunc) mwAwareIdBlock_hash,
					(GEqualFunc) mwAwareIdBlock_equal,
					NULL,
					(GDestroyNotify) aware_entry_free);

  srvc->attribs = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL,
					(GDestroyNotify) attrib_entry_free);

  service = MW_SERVICE(srvc);
  mwService_init(service, session, mwService_AWARE);

  service->recv_accept = (mwService_funcRecvAccept) recv_accept;
  service->recv_destroy = (mwService_funcRecvDestroy) recv_destroy;
  service->recv = recv;
  service->start = start;
  service->stop = stop;
  service->clear = clear;
  service->get_name = name;
  service->get_desc = desc;

  return srvc;
}


int mwServiceAware_setAttribute(struct mwServiceAware *srvc,
				guint32 key, struct mwOpaque *data) {
  struct mwPutBuffer *b;
  struct mwOpaque o;
  int ret;

  b = mwPutBuffer_new();

  guint32_put(b, 0x00);
  guint32_put(b, data->len);
  guint32_put(b, 0x00);
  guint32_put(b, key);
  mwOpaque_put(b, data);

  mwPutBuffer_finalize(&o, b);
  ret = mwChannel_send(srvc->channel, msg_OPT_DO_SET, &o);
  mwOpaque_clear(&o);

  return ret;
}


int mwServiceAware_setAttributeBoolean(struct mwServiceAware *srvc,
				       guint32 key, gboolean val) {
  int ret;
  struct mwPutBuffer *b;
  struct mwOpaque o;
 
  b = mwPutBuffer_new();

  gboolean_put(b, FALSE);
  gboolean_put(b, val);

  mwPutBuffer_finalize(&o, b);

  ret = mwServiceAware_setAttribute(srvc, key, &o);
  mwOpaque_clear(&o);

  return ret;
}


int mwServiceAware_setAttributeInteger(struct mwServiceAware *srvc,
				       guint32 key, guint32 val) {
  int ret;
  struct mwPutBuffer *b;
  struct mwOpaque o;
  
  b = mwPutBuffer_new();
  guint32_put(b, val);

  mwPutBuffer_finalize(&o, b);

  ret = mwServiceAware_setAttribute(srvc, key, &o);
  mwOpaque_clear(&o);

  return ret;
}


int mwServiceAware_setAttributeString(struct mwServiceAware *srvc,
				      guint32 key, const char *str) {
  int ret;
  struct mwPutBuffer *b;
  struct mwOpaque o;

  b = mwPutBuffer_new();
  mwString_put(b, str);

  mwPutBuffer_finalize(&o, b);

  ret = mwServiceAware_setAttribute(srvc, key, &o);
  mwOpaque_clear(&o);

  return ret;
}


int mwServiceAware_unsetAttribute(struct mwServiceAware *srvc,
				  guint32 key) {
  struct mwPutBuffer *b;
  struct mwOpaque o;
  int ret;

  b = mwPutBuffer_new();

  guint32_put(b, 0x00);
  guint32_put(b, key);
  
  mwPutBuffer_finalize(&o, b);
  ret = mwChannel_send(srvc->channel, msg_OPT_DO_UNSET, &o);
  mwOpaque_clear(&o);

  return ret;
}


guint32 mwAwareAttribute_getKey(const struct mwAwareAttribute *attrib) {
  g_return_val_if_fail(attrib != NULL, 0x00);
  return attrib->key;
}


gboolean mwAwareAttribute_asBoolean(const struct mwAwareAttribute *attrib) {
  struct mwGetBuffer *b;
  gboolean ret;
  
  if(! attrib) return FALSE;

  b = mwGetBuffer_wrap(&attrib->data);
  if(attrib->data.len >= 4) {
    guint32 r32 = 0x00;
    guint32_get(b, &r32);
    ret = !! r32;

  } else if(attrib->data.len >= 2) {
    guint16 r16 = 0x00;
    guint16_get(b, &r16);
    ret = !! r16;

  } else if(attrib->data.len) {
    gboolean_get(b, &ret);
  }

  mwGetBuffer_free(b);

  return ret;
}


guint32 mwAwareAttribute_asInteger(const struct mwAwareAttribute *attrib) {
  struct mwGetBuffer *b;
  guint32 r32 = 0x00;
  
  if(! attrib) return 0x00;

  b = mwGetBuffer_wrap(&attrib->data);
  if(attrib->data.len >= 4) {
    guint32_get(b, &r32);

  } else if(attrib->data.len == 3) {
    gboolean rb = FALSE;
    guint16 r16 = 0x00;
    gboolean_get(b, &rb);
    guint16_get(b, &r16);
    r32 = (guint32) r16;

  } else if(attrib->data.len == 2) {
    guint16 r16 = 0x00;
    guint16_get(b, &r16);
    r32 = (guint32) r16;

  } else if(attrib->data.len) {
    gboolean rb = FALSE;
    gboolean_get(b, &rb);
    r32 = (guint32) rb;
  }

  mwGetBuffer_free(b);

  return r32;
}


char *mwAwareAttribute_asString(const struct mwAwareAttribute *attrib) {
  struct mwGetBuffer *b;
  char *ret = NULL;

  if(! attrib) return NULL;

  b = mwGetBuffer_wrap(&attrib->data);
  mwString_get(b, &ret);
  mwGetBuffer_free(b);

  return ret;
}


const struct mwOpaque *
mwAwareAttribute_asOpaque(const struct mwAwareAttribute *attrib) {
  g_return_val_if_fail(attrib != NULL, NULL);
  return &attrib->data;
}
			  

struct mwAwareList *
mwAwareList_new(struct mwServiceAware *srvc,
		struct mwAwareListHandler *handler) {

  struct mwAwareList *al;

  g_return_val_if_fail(srvc != NULL, NULL);
  g_return_val_if_fail(handler != NULL, NULL);

  al = g_new0(struct mwAwareList, 1);
  al->service = srvc;
  al->handler = handler;

  srvc->lists = g_list_prepend(srvc->lists, al);

  return al;
}


void mwAwareList_free(struct mwAwareList *list) {
  struct mwServiceAware *srvc;
  struct mwAwareListHandler *handler;

  g_return_if_fail(list != NULL);
  g_return_if_fail(list->service != NULL);

  srvc = list->service;
  srvc->lists = g_list_remove_all(srvc->lists, list);

  handler = list->handler;
  if(handler && handler->clear) {
    handler->clear(list);
    list->handler = NULL;
  }

  mw_datum_clear(&list->client_data);

  mwAwareList_unwatchAllAttributes(list);
  mwAwareList_removeAllAware(list);

  list->service = NULL;

  g_free(list);
}


struct mwAwareListHandler *mwAwareList_getHandler(struct mwAwareList *list) {
  g_return_val_if_fail(list != NULL, NULL);
  return list->handler;
}


static void watch_add(struct mwAwareList *list, guint32 key) {
  struct mwServiceAware *srvc;
  struct attrib_entry *watch;
  gpointer k = GUINT_TO_POINTER(key);

  if(! list->attribs)
    list->attribs = g_hash_table_new(g_direct_hash, g_direct_equal);

  if(g_hash_table_lookup(list->attribs, k))
    return;

  srvc = list->service;

  watch = g_hash_table_lookup(srvc->attribs, k);
  if(! watch) {
    watch = g_new0(struct attrib_entry, 1);
    watch->key = key;
    g_hash_table_insert(srvc->attribs, k, watch);
  }

  g_hash_table_insert(list->attribs, k, watch);

  watch->membership = g_list_prepend(watch->membership, list);
}


static void watch_remove(struct mwAwareList *list, guint32 key) {
  struct attrib_entry *watch = NULL;
  gpointer k = GUINT_TO_POINTER(key);

  if(list->attribs)
    watch = g_hash_table_lookup(list->attribs, k);

  g_return_if_fail(watch != NULL);

  g_hash_table_remove(list->attribs, k);
  watch->membership = g_list_remove(watch->membership, list);
}


int mwAwareList_watchAttributeArray(struct mwAwareList *list,
				    guint32 *keys) {
  guint32 k;

  g_return_val_if_fail(list != NULL, -1);
  g_return_val_if_fail(list->service != NULL, -1);

  if(! keys) return 0;

  for(k = *keys; k; keys++)
    watch_add(list, k);

  return send_attrib_list(list->service);
}


int mwAwareList_watchAttributes(struct mwAwareList *list,
				guint32 key, ...) {
  guint32 k;
  va_list args;

  g_return_val_if_fail(list != NULL, -1);
  g_return_val_if_fail(list->service != NULL, -1);

  va_start(args, key);
  for(k = key; k; k = va_arg(args, guint32))
    watch_add(list, k);
  va_end(args);

  return send_attrib_list(list->service);
}


int mwAwareList_unwatchAttributeArray(struct mwAwareList *list,
				      guint32 *keys) {
  guint32 k;

  g_return_val_if_fail(list != NULL, -1);
  g_return_val_if_fail(list->service != NULL, -1);

  if(! keys) return 0;

  for(k = *keys; k; keys++)
    watch_add(list, k);

  return remove_unused_attrib(list->service);
}


int mwAwareList_unwatchAttributes(struct mwAwareList *list,
				  guint32 key, ...) {
  guint32 k;
  va_list args;

  g_return_val_if_fail(list != NULL, -1);
  g_return_val_if_fail(list->service != NULL, -1);

  va_start(args, key);
  for(k = key; k; k = va_arg(args, guint32))
    watch_remove(list, k);
  va_end(args);

  return remove_unused_attrib(list->service);
}


static void dismember_attrib(gpointer k, struct attrib_entry *watch,
			    struct mwAwareList *list) {

  watch->membership = g_list_remove(watch->membership, list);
}


int mwAwareList_unwatchAllAttributes(struct mwAwareList *list) {
  
  struct mwServiceAware *srvc;

  g_return_val_if_fail(list != NULL, -1);
  srvc = list->service;

  if(list->attribs) {
    g_hash_table_foreach(list->attribs, (GHFunc) dismember_attrib, list);
    g_hash_table_destroy(list->attribs);
  }

  return remove_unused_attrib(srvc);
}


static void collect_attrib_keys(gpointer key, struct attrib_entry *attrib,
				guint32 **ck) {
  guint32 *keys = (*ck)++;
  *keys = GPOINTER_TO_UINT(key);
}


guint32 *mwAwareList_getWatchedAttributes(struct mwAwareList *list) {
  guint32 *keys, **ck;
  guint count;

  g_return_val_if_fail(list != NULL, NULL);
  g_return_val_if_fail(list->attribs != NULL, NULL);
  
  count = g_hash_table_size(list->attribs);
  keys = g_new0(guint32, count + 1);

  ck = &keys;
  g_hash_table_foreach(list->attribs, (GHFunc) collect_attrib_keys, ck);

  return keys;
}


int mwAwareList_addAware(struct mwAwareList *list, GList *id_list) {

  /* for each awareness id:
     - if it's already in the list, continue
     - if it's not in the service list:
       - create an awareness
       - add it to the service list
     - add this list to the membership
     - add to the list
  */

  struct mwServiceAware *srvc;
  GList *additions = NULL;
  int ret = 0;

  g_return_val_if_fail(list != NULL, -1);

  srvc = list->service;
  g_return_val_if_fail(srvc != NULL, -1);

  for(; id_list; id_list = id_list->next) {
    if(list_add(list, id_list->data))
      additions = g_list_prepend(additions, id_list->data);
  }

  /* if the service is alive-- or getting there-- we'll need to send
     these additions upstream */
  if(MW_SERVICE_IS_LIVE(srvc) && additions)
    ret = send_add(srvc->channel, additions);

  g_list_free(additions);
  return ret;
}


int mwAwareList_removeAware(struct mwAwareList *list, GList *id_list) {

  /* for each awareness id:
     - if it's not in the list, forget it
     - remove from the list
     - remove list from the membership

     - call remove round
  */

  struct mwServiceAware *srvc;
  struct mwAwareIdBlock *id;
  struct aware_entry *aware;

  g_return_val_if_fail(list != NULL, -1);

  srvc = list->service;
  g_return_val_if_fail(srvc != NULL, -1);

  for(; id_list; id_list = id_list->next) {
    id = id_list->data;
    aware = list_aware_find(list, id);

    if(! aware) {
      g_warning("buddy %s, %s not in list",
		NSTR(id->user),
		NSTR(id->community));
      continue;
    }

    aware->membership = g_list_remove(aware->membership, list);
    g_hash_table_remove(list->entries, id);
  }

  return remove_unused(srvc);
}


static void dismember_aware(gpointer k, struct aware_entry *aware,
			    struct mwAwareList *list) {

  aware->membership = g_list_remove(aware->membership, list);
}


int mwAwareList_removeAllAware(struct mwAwareList *list) {
  struct mwServiceAware *srvc;

  g_return_val_if_fail(list != NULL, -1);
  srvc = list->service;

  g_return_val_if_fail(srvc != NULL, -1);

  /* for each entry, remove the aware list from the service entry's
     membership collection */
  if(list->entries) {
    g_hash_table_foreach(list->entries, (GHFunc) dismember_aware, list);
    g_hash_table_destroy(list->entries);
  }

  return remove_unused(srvc);
}


void mwAwareList_setClientData(struct mwAwareList *list,
			       gpointer data, GDestroyNotify clear) {

  g_return_if_fail(list != NULL);
  mw_datum_set(&list->client_data, data, clear);
}


gpointer mwAwareList_getClientData(struct mwAwareList *list) {
  g_return_val_if_fail(list != NULL, NULL);
  return mw_datum_get(&list->client_data);
}


void mwAwareList_removeClientData(struct mwAwareList *list) {
  g_return_if_fail(list != NULL);
  mw_datum_clear(&list->client_data);
}


void mwServiceAware_setStatus(struct mwServiceAware *srvc,
			      struct mwAwareIdBlock *user,
			      struct mwUserStatus *stat) {

  struct mwAwareSnapshot idb;

  g_return_if_fail(srvc != NULL);
  g_return_if_fail(user != NULL);
  g_return_if_fail(stat != NULL);

  /* just reference the strings. then we don't need to free them */
  idb.id.type = user->type;
  idb.id.user = user->user;
  idb.id.community = user->community;

  idb.group = NULL;
  idb.online = TRUE;
  idb.alt_id = NULL;

  idb.status.status = stat->status;
  idb.status.time = stat->time;
  idb.status.desc = stat->desc;

  idb.name = NULL;

  status_recv(srvc, &idb);
}


const struct mwAwareAttribute *
mwServiceAware_getAttribute(struct mwServiceAware *srvc,
			    struct mwAwareIdBlock *user,
			    guint32 key) {

  struct aware_entry *aware;

  g_return_val_if_fail(srvc != NULL, NULL);
  g_return_val_if_fail(user != NULL, NULL);
  g_return_val_if_fail(key != 0x00, NULL);

  aware = aware_find(srvc, user);
  g_return_val_if_fail(aware != NULL, NULL);

  return g_hash_table_lookup(aware->attribs, GUINT_TO_POINTER(key));
}


const char *mwServiceAware_getText(struct mwServiceAware *srvc,
				   struct mwAwareIdBlock *user) {

  struct aware_entry *aware;

  g_return_val_if_fail(srvc != NULL, NULL);
  g_return_val_if_fail(user != NULL, NULL);

  aware = aware_find(srvc, user);
  if(! aware) return NULL;

  return aware->aware.status.desc;
}