Hi Yunhan,
On Mon, Aug 21, 2017 at 10:19 AM, Yunhan Wang <yunhanw@xxxxxxxxxx> wrote:
> Hi, Luiz
>
> This is the patch that adds callback capability for
> g_dbus_emit_property_change, which will trigger callback gunvyion
> after property change is emitted if callback function is set. Since
> signal is broadcast, we will not be able to know if property change is
> received or not, but I hope I can get a kind of async callback to
> process further, for example, indication. Could you take a look?
I guess the proper way to receive a confirmation is to add a method to
GattCharacteristic1, e.g. Confirm, which bluetoothd would call upon
receiving a confirmation. Note that this is most informative since
bluetoothd will queue indication until they are properly confirmed so
the process may as well just send them in a batch. Now if you are
doing a protocol on top of GATT that is a totally different matter,
and perhaps we should extend the AcquireWrite and AcquireNotify to
peripheral as well, though in that case you would probably be using
the confirmation as acks? GATT request/indicate can have up to 30
seconds to receive a response and considering there may be other users
indicating there may be other requests on the queue, which is why
people resort to notification and write without response since those
do not need to be queued.
> Thanks
> Best wisehs
> Yunhan
>
> On Mon, Aug 21, 2017 at 12:03 AM, Yunhan Wang <yunhanw@xxxxxxxxxx> wrote:
>> This add g_dbus_emit_property_changed_with_callback to process callback functions after
>> property change is emitted.
>> ---
>> gdbus/gdbus.h | 18 +++++++++++++++---
>> gdbus/object.c | 39 ++++++++++++++++++++++++++++++++++-----
>> src/gatt-client.c | 2 +-
>> 3 files changed, 50 insertions(+), 9 deletions(-)
>>
>> diff --git a/gdbus/gdbus.h b/gdbus/gdbus.h
>> index e37385fa1..3974b6e8c 100644
>> --- a/gdbus/gdbus.h
>> +++ b/gdbus/gdbus.h
>> @@ -59,6 +59,8 @@ gboolean g_dbus_set_disconnect_function(DBusConnection *connection,
>> GDBusWatchFunction function,
>> void *user_data, DBusFreeFunction destroy);
>>
>> +typedef void (* GDBusResultFunction) (const DBusError *error, void *user_data);
>> +
>> typedef void (* GDBusDestroyFunction) (void *user_data);
>>
>> typedef DBusMessage * (* GDBusMethodFunction) (DBusConnection *connection,
>> @@ -314,10 +316,22 @@ void g_dbus_pending_property_error(GDBusPendingReply id, const char *name,
>> void g_dbus_emit_property_changed(DBusConnection *connection,
>> const char *path, const char *interface,
>> const char *name);
>> +
>> void g_dbus_emit_property_changed_full(DBusConnection *connection,
>> const char *path, const char *interface,
>> const char *name,
>> - GDbusPropertyChangedFlags flags);
>> + GDbusPropertyChangedFlags flags,
>> + GDBusResultFunction function,
>> + void *user_data,
>> + GDBusDestroyFunction destroy);
>> +
>> +void g_dbus_emit_property_changed_with_callback(DBusConnection *connection,
>> + const char *path, const char *interface,
>> + const char *name,
>> + GDBusResultFunction function,
>> + void *user_data,
>> + GDBusDestroyFunction destroy);
>> +
>> gboolean g_dbus_get_properties(DBusConnection *connection, const char *path,
>> const char *interface, DBusMessageIter *iter);
>>
>> @@ -341,8 +355,6 @@ gboolean g_dbus_proxy_get_property(GDBusProxy *proxy, const char *name,
>>
>> gboolean g_dbus_proxy_refresh_property(GDBusProxy *proxy, const char *name);
>>
>> -typedef void (* GDBusResultFunction) (const DBusError *error, void *user_data);
>> -
>> gboolean g_dbus_proxy_set_property_basic(GDBusProxy *proxy,
>> const char *name, int type, const void *value,
>> GDBusResultFunction function, void *user_data,
>> diff --git a/gdbus/object.c b/gdbus/object.c
>> index afb458764..04c3b4fb4 100644
>> --- a/gdbus/object.c
>> +++ b/gdbus/object.c
>> @@ -59,6 +59,9 @@ struct generic_data {
>> gboolean pending_prop;
>> char *introspect;
>> struct generic_data *parent;
>> + GDBusResultFunction function;
>> + void *user_data;
>> + GDBusDestroyFunction destroy;
>> };
>>
>> struct interface_data {
>> @@ -1002,21 +1005,29 @@ static void remove_pending(struct generic_data *data)
>> static gboolean process_changes(gpointer user_data)
>> {
>> struct generic_data *data = user_data;
>> -
>> + DBusError error;
>> + dbus_error_init(&error);
>> remove_pending(data);
>>
>> if (data->added != NULL)
>> emit_interfaces_added(data);
>>
>> /* Flush pending properties */
>> - if (data->pending_prop == TRUE)
>> + if (data->pending_prop == TRUE) {
>> process_property_changes(data);
>> + if (data->function != NULL) {
>> + data->function(&error, data->user_data);
>> + }
>>
>> + if (data->destroy != NULL) {
>> + data->destroy(data->user_data);
>> + }
>> + }
>> if (data->removed != NULL)
>> emit_interfaces_removed(data);
>>
>> data->process_id = 0;
>> -
>> + dbus_error_free(&error);
>> return FALSE;
>> }
>>
>> @@ -1732,7 +1743,10 @@ static void process_property_changes(struct generic_data *data)
>> void g_dbus_emit_property_changed_full(DBusConnection *connection,
>> const char *path, const char *interface,
>> const char *name,
>> - GDbusPropertyChangedFlags flags)
>> + GDbusPropertyChangedFlags flags,
>> + GDBusResultFunction function,
>> + void *user_data,
>> + GDBusDestroyFunction destroy)
>> {
>> const GDBusPropertyTable *property;
>> struct generic_data *data;
>> @@ -1770,6 +1784,13 @@ void g_dbus_emit_property_changed_full(DBusConnection *connection,
>> iface->pending_prop = g_slist_prepend(iface->pending_prop,
>> (void *) property);
>>
>> + if (function != NULL)
>> + {
>> + data->function = function;
>> + data->user_data = user_data;
>> + data->destroy = destroy;
>> + }
>> +
>> if (flags & G_DBUS_PROPERTY_CHANGED_FLAG_FLUSH)
>> process_property_changes(data);
>> else
>> @@ -1779,7 +1800,15 @@ void g_dbus_emit_property_changed_full(DBusConnection *connection,
>> void g_dbus_emit_property_changed(DBusConnection *connection, const char *path,
>> const char *interface, const char *name)
>> {
>> - g_dbus_emit_property_changed_full(connection, path, interface, name, 0);
>> + g_dbus_emit_property_changed_full(connection, path, interface, name, 0, NULL, NULL, NULL);
>> +}
>> +
>> +void g_dbus_emit_property_changed_with_callback(DBusConnection *connection, const char *path,
>> + const char *interface, const char *name,
>> + GDBusResultFunction function, void *user_data,
>> + GDBusDestroyFunction destroy)
>> +{
>> + g_dbus_emit_property_changed_full(connection, path, interface, name, 0, function, user_data, destroy);
>> }
>>
>> gboolean g_dbus_get_properties(DBusConnection *connection, const char *path,
>> diff --git a/src/gatt-client.c b/src/gatt-client.c
>> index 1cd7fbcf5..e70245c19 100644
>> --- a/src/gatt-client.c
>> +++ b/src/gatt-client.c
>> @@ -878,7 +878,7 @@ static void write_characteristic_cb(struct gatt_db_attribute *attr, int err,
>>
>> g_dbus_emit_property_changed_full(btd_get_dbus_connection(),
>> chrc->path, GATT_CHARACTERISTIC_IFACE,
>> - "Value", G_DBUS_PROPERTY_CHANGED_FLAG_FLUSH);
>> + "Value", G_DBUS_PROPERTY_CHANGED_FLAG_FLUSH, NULL, NULL, NULL);
>>
>> }
>>
>> --
>> 2.14.1.480.gb18f417b89-goog
>>
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--
Luiz Augusto von Dentz
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