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|
/* Helper to hold Telepathy handles.
*
* Copyright (C) 2008 Collabora Ltd. <http://www.collabora.co.uk/>
* Copyright (C) 2008 Nokia Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "telepathy-glib/connection-internal.h"
#include <dbus/dbus.h>
#include <dbus/dbus-glib-lowlevel.h>
#define DEBUG_FLAG TP_DEBUG_HANDLES
#include "telepathy-glib/debug-internal.h"
/*
* We allocate a global libdbus DBusConnection slot for this module. If
* used, it contains a
* GHashTable<gchar *Connection_object_path => Bucket>.
*
* A Bucket is basically just an array of GHashTable<handle => refcount>.
*
* This is external to the TpConnection because it has to be - if there
* are two TpConnection instances for the same Connection (perhaps they're
* of different subclasses), we need to share handle references between them.
*/
typedef struct {
/* number of TpConnection objects sharing this bucket */
gsize refcount;
/* guint handle => gsize refcount */
GHashTable *handle_refs[NUM_TP_HANDLE_TYPES];
} Bucket;
static inline void oom (void) G_GNUC_NORETURN;
static inline void
oom (void)
{
g_error ("Out of memory in libdbus. Cannot have a bucket");
}
static void
bucket_free (gpointer p)
{
Bucket *b = p;
guint i;
/* [0] is never allocated (handle type NONE), so start at [1] */
g_assert (b->handle_refs[0] == NULL);
for (i = 1; i < NUM_TP_HANDLE_TYPES; i++)
{
if (b->handle_refs[i] != NULL)
g_hash_table_destroy (b->handle_refs[i]);
}
g_slice_free (Bucket, p);
}
static Bucket *
bucket_new (void)
{
Bucket *b = g_slice_new0 (Bucket);
b->refcount = 1;
return b;
}
static dbus_int32_t connection_handle_refs_slot = -1;
static Bucket *
connection_get_bucket (TpConnection *connection)
{
TpProxy *as_proxy = (TpProxy *) connection;
DBusGConnection *g_connection = as_proxy->dbus_connection;
const gchar *object_path = as_proxy->object_path;
GHashTable *table;
Bucket *bucket = NULL;
/* _tp_connection_init_handle_refs should have already ensured that the
* assertions in this function will succeed. */
g_assert (connection_handle_refs_slot != -1);
table = dbus_connection_get_data (dbus_g_connection_get_connection (
g_connection), connection_handle_refs_slot);
g_assert (table != NULL);
bucket = g_hash_table_lookup (table, object_path);
g_assert (bucket != NULL);
return bucket;
}
static void
_tp_connection_ref_handles (TpConnection *connection,
TpHandleType handle_type,
const GArray *handles)
{
TpProxy *as_proxy = (TpProxy *) connection;
GHashTable *handle_refs;
Bucket *bucket;
guint i;
g_assert (as_proxy->invalidated == NULL);
g_assert (handle_type < NUM_TP_HANDLE_TYPES);
DEBUG ("%p: %u handles of type %u", connection, handles->len, handle_type);
bucket = connection_get_bucket (connection);
if (bucket->handle_refs[handle_type] == NULL)
bucket->handle_refs[handle_type] = g_hash_table_new (g_direct_hash,
g_direct_equal);
handle_refs = bucket->handle_refs[handle_type];
for (i = 0; i < handles->len; i++)
{
gpointer handle = GUINT_TO_POINTER (g_array_index (handles, guint, i));
gsize r = GPOINTER_TO_SIZE (g_hash_table_lookup (handle_refs, handle));
g_hash_table_insert (handle_refs, handle, GSIZE_TO_POINTER (r + 1));
}
}
static void
post_unref (TpConnection *connection,
const GError *error,
gpointer user_data,
GObject *weak_object)
{
GArray *arr = user_data;
if (error == NULL)
{
DEBUG ("Released %u handles", arr->len);
}
else
{
guint i;
DEBUG ("Failed to release %u handles: %s %u: %s",
arr->len, g_quark_to_string (error->domain), error->code,
error->message);
for (i = 0; i < arr->len; i++)
{
DEBUG (" %u", g_array_index (arr, guint, i));
}
}
}
static void
array_free_TRUE (gpointer p)
{
g_array_free (p, TRUE);
}
void
_tp_connection_init_handle_refs (TpConnection *self)
{
TpProxy *as_proxy = (TpProxy *) self;
DBusGConnection *g_connection = as_proxy->dbus_connection;
const gchar *object_path = as_proxy->object_path;
GHashTable *table;
Bucket *bucket = NULL;
g_assert (as_proxy->invalidated == NULL);
/* MT: libdbus protects us, if so configured */
if (!dbus_connection_allocate_data_slot (&connection_handle_refs_slot))
oom ();
/* MT: if we become thread safe, the rest of this function needs a lock */
table = dbus_connection_get_data (dbus_g_connection_get_connection (
g_connection), connection_handle_refs_slot);
if (table == NULL)
{
table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
bucket_free);
if (!dbus_connection_set_data (dbus_g_connection_get_connection (
g_connection), connection_handle_refs_slot, table,
(DBusFreeFunction) g_hash_table_destroy))
oom ();
}
else
{
bucket = g_hash_table_lookup (table, object_path);
}
if (bucket == NULL)
{
bucket = bucket_new ();
g_hash_table_insert (table, g_strdup (object_path), bucket);
}
else
{
bucket->refcount++;
}
}
/* Clean up after the connection is invalidated */
void
_tp_connection_clean_up_handle_refs (TpConnection *self)
{
TpProxy *as_proxy = (TpProxy *) self;
DBusGConnection *g_connection = as_proxy->dbus_connection;
const gchar *object_path = as_proxy->object_path;
GHashTable *table;
Bucket *bucket;
DEBUG ("%p", self);
g_assert (as_proxy->invalidated != NULL);
if (connection_handle_refs_slot == -1)
return;
/* MT: if we become thread safe, the rest of this function needs a lock */
table = dbus_connection_get_data (dbus_g_connection_get_connection (
g_connection), connection_handle_refs_slot);
if (table == NULL)
return;
bucket = g_hash_table_lookup (table, object_path);
if ((--bucket->refcount) > 0)
return;
if (g_hash_table_remove (table, object_path) &&
g_hash_table_size (table) == 0)
{
/* this calls the destructor, g_hash_table_destroy */
dbus_connection_set_data (dbus_g_connection_get_connection (
g_connection), connection_handle_refs_slot, NULL, NULL);
}
}
/**
* tp_connection_unref_handles:
* @self: a connection
* @handle_type: a handle type
* @n_handles: the number of handles in @handles
* @handles: an array of @n_handles handles
*
* Release the reference to the handles in @handles that was obtained by
* calling tp_connection_hold_handles() or tp_connection_request_handles().
*
* This function might release any references held by calling
* tp_cli_connection_call_request_handles(),
* tp_cli_connection_run_request_handles(),
* tp_cli_connection_call_hold_handles(),
* tp_cli_connection_run_hold_handles(),
* tp_cli_connection_interface_contacts_call_get_contact_attributes() or
* tp_cli_connection_interface_contacts_run_get_contact_attributes() directly.
* Those functions should be avoided in favour of using #TpContact,
* tp_connection_hold_handles(), tp_connection_request_handles() and
* tp_connection_get_contact_attributes().
*
* If @self has already become invalid, this function does nothing.
*/
void
tp_connection_unref_handles (TpConnection *self,
TpHandleType handle_type,
guint n_handles,
const TpHandle *handles)
{
TpProxy *as_proxy = (TpProxy *) self;
GHashTable *handle_refs;
Bucket *bucket;
guint i;
GArray *unref;
DEBUG ("%p: %u handles of type %u", self, n_handles, handle_type);
g_return_if_fail (TP_IS_CONNECTION (self));
g_return_if_fail (handle_type > TP_HANDLE_TYPE_NONE);
g_return_if_fail (handle_type < NUM_TP_HANDLE_TYPES);
if (as_proxy->invalidated != NULL)
{
return;
}
bucket = connection_get_bucket (self);
/* if there's no hash table, then we can't have a ref to the handles -
* user error */
g_return_if_fail (((void)"no refs exist to any handle of that type",
bucket->handle_refs[handle_type] != NULL));
handle_refs = bucket->handle_refs[handle_type];
unref = g_array_sized_new (FALSE, FALSE, sizeof (guint), n_handles);
for (i = 0; i < n_handles; i++)
{
gpointer handle = GUINT_TO_POINTER (handles[i]);
gsize r = GPOINTER_TO_SIZE (g_hash_table_lookup (handle_refs, handle));
g_return_if_fail (handles[i] != 0);
/* if we have no refs, it's user error */
g_return_if_fail (((void)"no refs exist to one of the handles", r != 0));
if (r == 1)
{
DEBUG ("releasing handle %u", handles[i]);
g_array_append_val (unref, handles[i]);
g_hash_table_remove (handle_refs, handle);
}
else
{
DEBUG ("decrementing handle %u to %" G_GSIZE_FORMAT, handles[i],
r - 1);
g_hash_table_insert (handle_refs, handle, GSIZE_TO_POINTER (r - 1));
}
}
/* Fire off the unref call asynchronously, ignore error if any.
* This can't be done idly (so we can combine unrefs) without additional
* checks, since that would introduce a race between the idle handler
* running, and someone else holding the handles again. */
if (unref->len > 0)
{
DEBUG ("releasing %u handles", unref->len);
tp_cli_connection_call_release_handles (self, -1,
handle_type, unref, post_unref, unref, array_free_TRUE, NULL);
}
else
{
g_array_free (unref, TRUE);
}
}
typedef struct {
TpHandleType handle_type;
GArray *handles;
gpointer user_data;
GDestroyNotify destroy;
TpConnectionHoldHandlesCb callback;
} HoldHandlesContext;
static void
hold_handles_context_free (gpointer p)
{
HoldHandlesContext *context = p;
if (context->destroy != NULL)
context->destroy (context->user_data);
g_array_free (context->handles, TRUE);
g_slice_free (HoldHandlesContext, context);
}
/**
* TpConnectionHoldHandlesCb:
* @connection: the connection
* @handle_type: the handle type that was passed to
* tp_connection_hold_handles()
* @n_handles: the number of handles that were passed to
* tp_connection_hold_handles() on success, or 0 on failure
* @handles: a copy of the array of @n_handles handles that was passed to
* tp_connection_hold_handles() on success, or %NULL on failure
* @error: %NULL on success, or an error on failure
* @user_data: the same arbitrary pointer that was passed to
* tp_connection_hold_handles()
* @weak_object: the same object that was passed to
* tp_connection_hold_handles()
*
* Signature of the callback called when tp_connection_hold_handles() succeeds
* or fails.
*
* On success, the caller has one reference to each handle in @handles, which
* may be released later with tp_connection_unref_handles(). If not
* released, the handles will remain valid until @connection becomes invalid
* (signalled by TpProxy::invalidated).
*
* For convenience, the handle type and handles requested by the caller are
* passed through to this callback on success, so the caller does not have to
* include them in @user_data.
*/
static void
connection_held_handles (TpConnection *self,
const GError *error,
gpointer user_data,
GObject *weak_object)
{
HoldHandlesContext *context = user_data;
g_object_ref (self);
if (error == NULL)
{
DEBUG ("%u handles of type %u", context->handles->len,
context->handle_type);
/* On the Telepathy side, we have held these handles (at least once).
* On the GLib side, record that we have one reference */
_tp_connection_ref_handles (self, context->handle_type,
context->handles);
context->callback (self, context->handle_type, context->handles->len,
(const TpHandle *) context->handles->data, NULL,
context->user_data, weak_object);
}
else
{
DEBUG ("%u handles of type %u failed: %s %u: %s",
context->handles->len, context->handle_type,
g_quark_to_string (error->domain), error->code, error->message);
context->callback (self, context->handle_type, 0, NULL, error,
context->user_data, weak_object);
}
g_object_unref (self);
}
/**
* tp_connection_hold_handles:
* @self: a connection
* @timeout_ms: the timeout in milliseconds, or -1 to use the default
* @handle_type: the handle type
* @n_handles: the number of handles in @handles (must be at least 1)
* @handles: an array of handles
* @callback: called on success or failure (unless @weak_object has become
* unreferenced)
* @user_data: arbitrary user-supplied data
* @destroy: called to destroy @user_data after calling @callback, or when
* @weak_object becomes unreferenced (whichever occurs sooner)
* @weak_object: if not %NULL, an object to be weakly referenced: if it is
* destroyed, @callback will not be called
*
* Hold (ensure a reference to) the given handles, if they are valid.
*
* If they are valid, the callback will later be called with the given
* handles; if not all of them are valid, the callback will be called with
* an error.
*/
void
tp_connection_hold_handles (TpConnection *self,
gint timeout_ms,
TpHandleType handle_type,
guint n_handles,
const TpHandle *handles,
TpConnectionHoldHandlesCb callback,
gpointer user_data,
GDestroyNotify destroy,
GObject *weak_object)
{
HoldHandlesContext *context;
g_return_if_fail (TP_IS_CONNECTION (self));
g_return_if_fail (handle_type > TP_HANDLE_TYPE_NONE);
g_return_if_fail (handle_type < NUM_TP_HANDLE_TYPES);
g_return_if_fail (n_handles >= 1);
g_return_if_fail (callback != NULL);
context = g_slice_new0 (HoldHandlesContext);
context->handle_type = handle_type;
context->user_data = user_data;
context->destroy = destroy;
context->handles = g_array_sized_new (FALSE, FALSE, sizeof (guint),
n_handles);
g_array_append_vals (context->handles, handles, n_handles);
context->callback = callback;
tp_cli_connection_call_hold_handles (self, timeout_ms, handle_type,
context->handles, connection_held_handles,
context, hold_handles_context_free, weak_object);
}
typedef struct {
TpHandleType handle_type;
guint n_ids;
gchar **ids;
gpointer user_data;
GDestroyNotify destroy;
TpConnectionRequestHandlesCb callback;
} RequestHandlesContext;
static void
request_handles_context_free (gpointer p)
{
RequestHandlesContext *context = p;
g_strfreev (context->ids);
if (context->destroy != NULL)
context->destroy (context->user_data);
g_slice_free (RequestHandlesContext, context);
}
/**
* TpConnectionRequestHandlesCb:
* @connection: the connection
* @handle_type: the handle type that was passed to
* tp_connection_request_handles()
* @n_handles: the number of IDs that were passed to
* tp_connection_request_handles() on success, or 0 on failure
* @handles: the @n_handles handles corresponding to @ids, in the same order,
* or %NULL on failure
* @ids: a copy of the array of @n_handles IDs that was passed to
* tp_connection_request_handles() on success, or %NULL on failure
* @error: %NULL on success, or an error on failure
* @user_data: the same arbitrary pointer that was passed to
* tp_connection_request_handles()
* @weak_object: the same object that was passed to
* tp_connection_request_handles()
*
* Signature of the callback called when tp_connection_request_handles()
* succeeds or fails.
*
* On success, the caller has one reference to each handle in @handles, which
* may be released later with tp_connection_unref_handles(). If not
* released, the handles will remain valid until @connection becomes invalid
* (signalled by TpProxy::invalidated).
*
* For convenience, the handle type and IDs requested by the caller are
* passed through to this callback, so the caller does not have to include
* them in @user_data.
*/
static void
connection_requested_handles (TpConnection *self,
const GArray *handles,
const GError *error,
gpointer user_data,
GObject *weak_object)
{
RequestHandlesContext *context = user_data;
g_object_ref (self);
if (error == NULL)
{
if (G_UNLIKELY (g_strv_length (context->ids) != handles->len))
{
const gchar *cm = tp_proxy_get_bus_name ((TpProxy *) self);
GError *e = g_error_new (TP_DBUS_ERRORS, TP_DBUS_ERROR_INCONSISTENT,
"Connection manager %s is broken: we asked for %u "
"handles but RequestHandles returned %u",
cm, g_strv_length (context->ids), handles->len);
/* This CM is bad and wrong. We can't trust it to get anything
* right, so we'd probably better leak the handles, hence this
* early-return comes before recording that we have a ref to them. */
g_warning ("%s", e->message);
context->callback (self, context->handle_type, 0, NULL, NULL,
error, context->user_data, weak_object);
return;
}
DEBUG ("%u handles of type %u", handles->len,
context->handle_type);
/* On the Telepathy side, we have held these handles (at least once).
* On the GLib side, record that we have one reference */
_tp_connection_ref_handles (self, context->handle_type,
handles);
context->callback (self, context->handle_type, handles->len,
(const TpHandle *) handles->data,
(const gchar * const *) context->ids,
NULL, context->user_data, weak_object);
}
else
{
DEBUG ("%u handles of type %u failed: %s %u: %s",
g_strv_length (context->ids), context->handle_type,
g_quark_to_string (error->domain), error->code, error->message);
context->callback (self, context->handle_type, 0, NULL, NULL, error,
context->user_data, weak_object);
}
g_object_unref (self);
}
/**
* tp_connection_request_handles:
* @self: a connection
* @timeout_ms: the timeout in milliseconds, or -1 to use the default
* @handle_type: the handle type
* @ids: an array of string identifiers for which handles are required,
* terminated by %NULL (must not be %NULL or empty)
* @callback: called on success or failure (unless @weak_object has become
* unreferenced)
* @user_data: arbitrary user-supplied data
* @destroy: called to destroy @user_data after calling @callback, or when
* @weak_object becomes unreferenced (whichever occurs sooner)
* @weak_object: if not %NULL, an object to be weakly referenced: if it is
* destroyed, @callback will not be called
*
* Request the handles corresponding to the given identifiers, and if they
* are valid, hold (ensure a reference to) the corresponding handles.
*
* If they are valid, the callback will later be called with the given
* handles; if not all of them are valid, the callback will be called with
* an error.
*/
void
tp_connection_request_handles (TpConnection *self,
gint timeout_ms,
TpHandleType handle_type,
const gchar * const *ids,
TpConnectionRequestHandlesCb callback,
gpointer user_data,
GDestroyNotify destroy,
GObject *weak_object)
{
RequestHandlesContext *context;
g_return_if_fail (TP_IS_CONNECTION (self));
g_return_if_fail (handle_type > TP_HANDLE_TYPE_NONE);
g_return_if_fail (handle_type < NUM_TP_HANDLE_TYPES);
g_return_if_fail (ids != NULL);
g_return_if_fail (ids[0] != NULL);
g_return_if_fail (callback != NULL);
context = g_slice_new0 (RequestHandlesContext);
context->handle_type = handle_type;
context->ids = g_strdupv ((GStrv) ids);
context->user_data = user_data;
context->destroy = destroy;
context->callback = callback;
tp_cli_connection_call_request_handles (self, timeout_ms, handle_type,
(const gchar **) context->ids, connection_requested_handles,
context, request_handles_context_free, weak_object);
}
typedef struct {
tp_cli_connection_interface_contacts_callback_for_get_contact_attributes
callback;
gpointer user_data;
GDestroyNotify destroy;
gboolean hold;
} GetContactAttributesContext;
static void
get_contact_attributes_context_free (gpointer p)
{
GetContactAttributesContext *c = p;
if (c->destroy != NULL)
c->destroy (c->user_data);
g_slice_free (GetContactAttributesContext, c);
}
static void
connection_got_contact_attributes (TpConnection *self,
GHashTable *attributes,
const GError *error,
gpointer user_data,
GObject *weak_object)
{
GetContactAttributesContext *c = user_data;
DEBUG ("%u handles, hold=%c", g_hash_table_size (attributes),
c->hold ? 'T' : 'F');
if (c->hold)
{
GHashTableIter iter;
gpointer key, value;
GArray *handles = g_array_sized_new (FALSE, FALSE, sizeof (guint),
g_hash_table_size (attributes));
g_hash_table_iter_init (&iter, attributes);
while (g_hash_table_iter_next (&iter, &key, &value))
{
TpHandle handle = GPOINTER_TO_UINT (key);
DEBUG ("- %u", handle);
g_array_append_val (handles, handle);
}
/* remember that we have a ref */
_tp_connection_ref_handles (self, TP_HANDLE_TYPE_CONTACT, handles);
g_array_free (handles, TRUE);
}
c->callback (self, attributes, error, c->user_data, weak_object);
}
/**
* tp_connection_get_contact_attributes:
* @self: a connection
* @timeout_ms: the timeout in milliseconds, or -1 to use the default
* @n_handles: the number of handles in @handles (must be at least 1)
* @handles: an array of handles
* @interfaces: a #GStrv of interfaces
* @hold: if %TRUE, the callback will hold one reference to each valid handle
* @callback: called on success or failure (unless @weak_object has become
* unreferenced)
* @user_data: arbitrary user-supplied data
* @destroy: called to destroy @user_data after calling @callback, or when
* @weak_object becomes unreferenced (whichever occurs sooner)
* @weak_object: if not %NULL, an object to be weakly referenced: if it is
* destroyed, @callback will not be called
*
* Return (via a callback) any number of attributes of the given handles, and
* if they are valid and @hold is TRUE, hold a reference to them.
*
* This is a thin wrapper around the GetContactAttributes D-Bus method, and
* should be used in preference to
* tp_cli_connection_interface_contacts_get_contact_attributes().
* The #TpContact API provides a higher-level abstraction which should
* usually be used instead.
*
* @callback will later be called with the attributes of those of the given
* handles that were valid. Invalid handles are simply omitted from the
* parameter to the callback.
*
* If @hold is %TRUE, the @callback is given one reference to each handle
* that appears as a key in the callback's @attributes parameter.
*/
void
tp_connection_get_contact_attributes (TpConnection *self,
gint timeout_ms,
guint n_handles,
const TpHandle *handles,
const gchar * const *interfaces,
gboolean hold,
tp_cli_connection_interface_contacts_callback_for_get_contact_attributes callback,
gpointer user_data,
GDestroyNotify destroy,
GObject *weak_object)
{
GetContactAttributesContext *c;
GArray *a;
guint i;
DEBUG ("%u handles, hold=%c", n_handles, hold ? 'T' : 'F');
for (i = 0; i < n_handles; i++)
DEBUG ("- %u", handles[i]);
g_return_if_fail (TP_IS_CONNECTION (self));
g_return_if_fail (n_handles >= 1);
g_return_if_fail (handles != NULL);
g_return_if_fail (callback != NULL);
c = g_slice_new0 (GetContactAttributesContext);
a = g_array_sized_new (FALSE, FALSE, sizeof (guint), n_handles);
g_array_append_vals (a, handles, n_handles);
c->destroy = destroy;
c->user_data = user_data;
c->callback = callback;
c->hold = hold;
tp_cli_connection_interface_contacts_call_get_contact_attributes (self, -1,
a, (const gchar **) interfaces, hold, connection_got_contact_attributes,
c, get_contact_attributes_context_free, weak_object);
g_array_free (a, TRUE);
}
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