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bluez5: remove libdbus object manager wrappers

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Pauli Virtanen 2022-11-14 01:47:06 +02:00 • committed by Wim Taymans
parent bd45f846fc
commit 8d438d26ab
4 changed files with 0 additions and 1764 deletions
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686
spa/plugins/bluez5/dbus-manager.c
View file

@ -1,686 +0,0 @@
/* Spa dbus
*
* Copyright © 2022 Pauli Virtanen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <errno.h>
#include <stddef.h>
#include <stdalign.h>
#include <dbus/dbus.h>
#include <spa/support/log.h>
#include <spa/utils/hook.h>
#include <spa/utils/list.h>
#include <spa/utils/string.h>
#include <spa/utils/result.h>
#include "dbus-manager.h"
#undef SPA_LOG_TOPIC_DEFAULT
#define SPA_LOG_TOPIC_DEFAULT (&impl->log_topic)
#define DBUS_INTERFACE_OBJECT_MANAGER "org.freedesktop.DBus.ObjectManager"
struct object;
struct impl
{
struct spa_dbus_object_manager this;
DBusConnection *conn;
struct spa_log_topic log_topic;
struct spa_log *log;
struct object *root;
};
struct object
{
struct impl *impl;
struct spa_dbus_local_object alignas(max_align_t) this;
};
const struct spa_dbus_property *object_interface_get_property(struct object *o,
const struct spa_dbus_local_interface *iface, const char *name)
{
const struct spa_dbus_property *prop;
for (prop = iface->properties; prop && prop->name; ++prop) {
if (spa_streq(prop->name, name) && (prop->exists == NULL || prop->exists(&o->this)))
return prop;
}
return NULL;
}
const struct spa_dbus_local_interface *object_get_interface(struct object *o, const char *interface)
{
const struct spa_dbus_local_interface *iface;
for (iface = o->this.interfaces; iface && iface->name; ++iface)
if (spa_streq(interface, iface->name))
return iface;
return NULL;
}
static DBusMessage *object_properties_get(struct object *o, DBusMessage *m)
{
struct impl *impl = o->impl;
const char *interface, *name;
const struct spa_dbus_local_interface *iface;
const struct spa_dbus_property *prop;
DBusMessage *r;
DBusMessageIter i, v;
int res;
if (!dbus_message_get_args(m, NULL,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_INVALID))
return dbus_message_new_error(m, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
iface = object_get_interface(o, interface);
if (!iface)
return dbus_message_new_error(m, DBUS_ERROR_UNKNOWN_INTERFACE,
"No such interface");
prop = object_interface_get_property(o, iface, name);
if (!prop)
return dbus_message_new_error(m, DBUS_ERROR_UNKNOWN_PROPERTY,
"No such property");
if (!prop->get)
return dbus_message_new_error(m, DBUS_ERROR_FAILED,
"Write-only property");
r = dbus_message_new_method_return(m);
if (r == NULL)
return NULL;
dbus_message_iter_init_append(r, &i);
dbus_message_iter_open_container(&i, DBUS_TYPE_VARIANT, prop->signature, &v);
if ((res = prop->get(&o->this, &v)) < 0) {
spa_log_debug(impl->log, "failed to get property %s value: %s",
prop->name, spa_strerror(res));
dbus_message_unref(r);
return dbus_message_new_error(m, DBUS_ERROR_FAILED,
"Failed to get property");
}
dbus_message_iter_close_container(&i, &v);
return r;
}
static int object_append_properties(struct object *o, const struct spa_dbus_property *properties, DBusMessageIter *i)
{
struct impl *impl = o->impl;
DBusMessageIter d;
const struct spa_dbus_property *prop;
dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "{sv}", &d);
for (prop = properties; prop && prop->name; ++prop) {
DBusMessageIter e, v;
int res;
if (!(prop->exists == NULL || prop->exists(&o->this)) || !prop->get)
continue;
dbus_message_iter_open_container(&d, DBUS_TYPE_DICT_ENTRY, NULL, &e);
dbus_message_iter_append_basic(&e, DBUS_TYPE_STRING, &prop->name);
dbus_message_iter_open_container(&e, DBUS_TYPE_VARIANT, prop->signature, &v);
if ((res = prop->get(&o->this, &v)) < 0) {
spa_log_debug(impl->log, "failed to get property %s value: %s",
prop->name, spa_strerror(res));
return res;
}
dbus_message_iter_close_container(&e, &v);
dbus_message_iter_close_container(&d, &e);
}
dbus_message_iter_close_container(i, &d);
return 0;
}
static DBusMessage *object_properties_get_all(struct object *o, DBusMessage *m)
{
const char *interface;
const struct spa_dbus_local_interface *iface;
DBusMessageIter i;
DBusMessage *r;
if (!dbus_message_get_args(m, NULL,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_INVALID))
return dbus_message_new_error(m, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
iface = object_get_interface(o, interface);
if (!iface)
return dbus_message_new_error(m, DBUS_ERROR_UNKNOWN_INTERFACE,
"No such interface");
r = dbus_message_new_method_return(m);
if (r == NULL)
return NULL;
dbus_message_iter_init_append(r, &i);
if (object_append_properties(o, iface->properties, &i) < 0) {
dbus_message_unref(r);
return dbus_message_new_error(m, DBUS_ERROR_FAILED,
"Failed to get properties");
}
return r;
}
static DBusMessage *object_properties_set(struct object *o, DBusMessage *m)
{
struct impl *impl = o->impl;
const char *interface, *name;
const struct spa_dbus_local_interface *iface;
const struct spa_dbus_property *prop;
DBusMessageIter it, value;
char *value_signature;
bool valid_signature;
int res;
if (!dbus_message_has_signature(m, "ssv"))
return dbus_message_new_error(m, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
dbus_message_iter_init(m, &it);
dbus_message_iter_get_basic(&it, &interface);
dbus_message_iter_next(&it);
dbus_message_iter_get_basic(&it, &name);
dbus_message_iter_next(&it);
iface = object_get_interface(o, interface);
if (!iface)
return dbus_message_new_error(m, DBUS_ERROR_UNKNOWN_INTERFACE,
"No such interface");
prop = object_interface_get_property(o, iface, name);
if (!prop)
return dbus_message_new_error(m, DBUS_ERROR_UNKNOWN_PROPERTY,
"No such property");
if (prop->set == NULL)
return dbus_message_new_error(m, DBUS_ERROR_PROPERTY_READ_ONLY,
"Read-only property");
dbus_message_iter_recurse(&it, &value);
value_signature = dbus_message_iter_get_signature(&value);
valid_signature = spa_streq(prop->signature, value_signature);
dbus_free(value_signature);
if (!valid_signature)
return dbus_message_new_error(m, DBUS_ERROR_INVALID_SIGNATURE,
"Invalid value signature");
if ((res = prop->set(&o->this, &value)) < 0) {
spa_log_debug(impl->log, "failed to set property %s value: %s",
prop->name, spa_strerror(res));
return dbus_message_new_error(m, DBUS_ERROR_FAILED,
"Failed to set property");
}
return dbus_message_new_method_return(m);
}
static DBusHandlerResult object_handler(DBusConnection *c, DBusMessage *m, void *userdata)
{
struct object *o = userdata;
struct impl *impl = o->impl;
const char *path, *interface, *member;
DBusMessage *r = NULL;
path = dbus_message_get_path(m);
interface = dbus_message_get_interface(m);
member = dbus_message_get_member(m);
spa_log_debug(impl->log, "dbus: path=%s, interface=%s, member=%s", path, interface, member);
if (dbus_message_is_method_call(m, DBUS_INTERFACE_PROPERTIES, "Get")) {
r = object_properties_get(o, m);
} else if (dbus_message_is_method_call(m, DBUS_INTERFACE_PROPERTIES, "GetAll")) {
r = object_properties_get_all(o, m);
} else if (dbus_message_is_method_call(m, DBUS_INTERFACE_PROPERTIES, "Set")) {
r = object_properties_set(o, m);
} else {
const struct spa_dbus_local_interface *iface = object_get_interface(o, interface);
bool called = false;
if (iface) {
const struct spa_dbus_method *method;
for (method = iface->methods; method && method->name; ++method) {
if (dbus_message_is_method_call(m, iface->name, method->name)) {
r = method->call(&o->this, m);
called = true;
break;
}
}
}
if (!called)
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
if (r != NULL && dbus_connection_send(impl->conn, r, NULL)) {
dbus_message_unref(r);
return DBUS_HANDLER_RESULT_HANDLED;
} else if (r) {
dbus_message_unref(r);
}
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static int object_signal_interfaces_added(struct object *o)
{
struct impl *impl = o->impl;
struct object *root = impl->root;
const struct spa_dbus_local_interface *iface;
DBusMessage *s;
DBusMessageIter i, a;
if (root == NULL)
root = o; /* we're root, impl still initializing */
s = dbus_message_new_signal(root->this.path,
DBUS_INTERFACE_OBJECT_MANAGER,
"InterfacesAdded");
if (s == NULL)
return -ENOMEM;
dbus_message_iter_init_append(s, &i);
dbus_message_iter_append_basic(&i, DBUS_TYPE_OBJECT_PATH, &o->this.path);
dbus_message_iter_open_container(&i, DBUS_TYPE_ARRAY, "{sa{sv}}", &a);
for (iface = o->this.interfaces; iface && iface->name; ++iface) {
DBusMessageIter e;
int res;
spa_log_debug(impl->log, "dbus: signal add interface path=%s interface=%s",
o->this.path, iface->name);
dbus_message_iter_open_container(&a, DBUS_TYPE_DICT_ENTRY, NULL, &e);
dbus_message_iter_append_basic(&e, DBUS_TYPE_STRING, &iface->name);
if ((res = object_append_properties(o, iface->properties, &e)) < 0) {
dbus_message_unref(s);
return res;
}
dbus_message_iter_close_container(&a, &e);
}
dbus_message_iter_close_container(&i, &a);
dbus_connection_send(impl->conn, s, NULL);
dbus_message_unref(s);
return 0;
}
static int object_signal_interfaces_removed(struct object *o)
{
struct impl *impl = o->impl;
struct object *root = impl->root;
const struct spa_dbus_local_interface *iface;
DBusMessage *s;
DBusMessageIter i, a;
spa_assert(root);
s = dbus_message_new_signal(root->this.path,
DBUS_INTERFACE_OBJECT_MANAGER,
"InterfacesRemoved");
if (s == NULL)
return -ENOMEM;
dbus_message_iter_init_append(s, &i);
dbus_message_iter_append_basic(&i, DBUS_TYPE_OBJECT_PATH, &o->this.path);
dbus_message_iter_open_container(&i, DBUS_TYPE_ARRAY, "s", &a);
for (iface = o->this.interfaces; iface && iface->name; ++iface) {
spa_log_debug(impl->log, "dbus: signal remove interface path=%s interface=%s",
o->this.path, iface->name);
dbus_message_iter_append_basic(&a, DBUS_TYPE_STRING, &iface->name);
}
dbus_message_iter_close_container(&i, &a);
dbus_connection_send(impl->conn, s, NULL);
dbus_message_unref(s);
return 0;
}
static int object_signal_properties_changed(struct object *o,
const struct spa_dbus_local_interface *iface,
const struct spa_dbus_property *properties)
{
struct impl *impl = o->impl;
const struct spa_dbus_property *prop;
DBusMessage *s;
DBusMessageIter i, a;
int res;
if (properties == NULL || properties->name == NULL) {
/* nothing was changed */
return 0;
}
s = dbus_message_new_signal(o->this.path,
DBUS_INTERFACE_PROPERTIES,
"PropertiesChanged");
if (s == NULL)
return -ENOMEM;
dbus_message_iter_init_append(s, &i);
dbus_message_iter_append_basic(&i, DBUS_TYPE_STRING, &iface->name);
if ((res = object_append_properties(o, properties, &i)) < 0) {
dbus_message_unref(s);
return res;
}
dbus_message_iter_open_container(&i, DBUS_TYPE_ARRAY, "s", &a);
for (prop = properties; prop && prop->name; ++prop) {
spa_log_debug(impl->log, "dbus: signal properties changed path=%s interface=%s property=%s",
o->this.path, iface->name, prop->name);
if (prop->exists == NULL || prop->exists(&o->this))
continue;
dbus_message_iter_append_basic(&a, DBUS_TYPE_STRING, &prop->name);
}
dbus_message_iter_close_container(&i, &a);
dbus_connection_send(impl->conn, s, NULL);
dbus_message_unref(s);
return 0;
}
static struct object *object_new(struct impl *impl,
const char *path,
const struct spa_dbus_local_interface *interfaces,
size_t object_size,
void *user_data)
{
static const DBusObjectPathVTable vtable = {
.message_function = object_handler,
};
const struct spa_dbus_local_interface *iface;
struct object *o;
o = calloc(1, sizeof(struct object) - sizeof(struct spa_dbus_local_object) + object_size);
if (o == NULL)
return NULL;
spa_log_debug(impl->log, "dbus: register path=%s", path);
if (!dbus_connection_register_object_path(impl->conn, path, &vtable, o)) {
free(o);
errno = EIO;
return NULL;
}
spa_list_append(&impl->this.object_list, &o->this.link);
o->impl = impl;
o->this.path = strdup(path);
o->this.interfaces = interfaces;
o->this.user_data = user_data;
spa_assert(o->this.path);
for (iface = o->this.interfaces; iface && iface->name; ++iface) {
if (iface->init)
iface->init(&o->this);
}
object_signal_interfaces_added(o);
return o;
}
static void object_destroy(struct object *o)
{
struct impl *impl = o->impl;
const struct spa_dbus_local_interface *iface;
object_signal_interfaces_removed(o);
spa_list_remove(&o->this.link);
for (iface = o->this.interfaces; iface && iface->name; ++iface) {
if (iface->destroy)
iface->destroy(&o->this);
}
spa_log_debug(impl->log, "dbus: unregister path=%s", o->this.path);
dbus_connection_unregister_object_path(impl->conn, o->this.path);
free(o);
}
static struct object *object_find(struct impl *impl, const char *path)
{
struct spa_dbus_local_object *obj;
spa_list_for_each(obj, &impl->this.object_list, link) {
struct object *o = SPA_CONTAINER_OF(obj, struct object, this);
if (spa_streq(o->this.path, path))
return o;
}
return NULL;
}
static DBusMessage *root_get_managed_objects(struct spa_dbus_local_object *object, DBusMessage *m)
{
struct impl *impl = object->user_data;
DBusMessage *r;
DBusMessageIter i, object_array;
struct spa_dbus_local_object *obj;
if ((r = dbus_message_new_method_return(m)) == NULL)
return NULL;
dbus_message_iter_init_append(r, &i);
dbus_message_iter_open_container(&i, DBUS_TYPE_ARRAY, "{oa{sa{sv}}}", &object_array);
spa_list_for_each(obj, &impl->this.object_list, link) {
struct object *o = SPA_CONTAINER_OF(obj, struct object, this);
const struct spa_dbus_local_interface *iface;
DBusMessageIter object_entry;
DBusMessageIter interface_array;
dbus_message_iter_open_container(&object_array, DBUS_TYPE_DICT_ENTRY, NULL, &object_entry);
dbus_message_iter_append_basic(&object_entry, DBUS_TYPE_OBJECT_PATH, &o->this.path);
dbus_message_iter_open_container(&object_entry, DBUS_TYPE_ARRAY, "{sa{sv}}", &interface_array);
for (iface = o->this.interfaces; iface && iface->name; ++iface) {
DBusMessageIter interface_entry;
dbus_message_iter_open_container(&interface_array, DBUS_TYPE_DICT_ENTRY, NULL, &interface_entry);
dbus_message_iter_append_basic(&interface_entry, DBUS_TYPE_STRING, &iface->name);
if (object_append_properties(o, iface->properties, &interface_entry) < 0) {
dbus_message_unref(r);
return dbus_message_new_error(m, DBUS_ERROR_FAILED,
"Failed to get properties");
}
dbus_message_iter_close_container(&interface_array, &interface_entry);
}
dbus_message_iter_close_container(&object_entry, &interface_array);
dbus_message_iter_close_container(&object_array, &object_entry);
}
dbus_message_iter_close_container(&i, &object_array);
return r;
}
static const struct spa_dbus_method root_methods[] = {
{
.name = "GetManagedObjects",
.call = root_get_managed_objects,
},
{NULL}
};
static const struct spa_dbus_local_interface root_interfaces[] = {
{
.name = DBUS_INTERFACE_OBJECT_MANAGER,
.methods = root_methods,
},
{NULL}
};
struct spa_dbus_object_manager *spa_dbus_object_manager_new(DBusConnection *conn, const char *path, struct spa_log *log)
{
struct impl *impl;
impl = calloc(1, sizeof(struct impl));
if (impl == NULL)
return NULL;
impl->conn = conn;
impl->log = log;
impl->log_topic = SPA_LOG_TOPIC(0, "spa.bluez5.dbus");
spa_log_topic_init(impl->log, &impl->log_topic);
spa_list_init(&impl->this.object_list);
impl->root = object_new(impl, path, root_interfaces, sizeof(struct spa_dbus_local_object), impl);
if (impl->root == NULL) {
free(impl);
return NULL;
}
impl->this.path = impl->root->this.path;
dbus_connection_ref(impl->conn);
return &impl->this;
}
void spa_dbus_object_manager_destroy(struct spa_dbus_object_manager *this)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
struct spa_dbus_local_object *obj;
struct spa_list tmp;
spa_list_init(&tmp);
spa_list_remove(&impl->root->this.link);
spa_list_append(&tmp, &impl->root->this.link);
spa_list_consume(obj, &impl->this.object_list, link) {
struct object *o = SPA_CONTAINER_OF(obj, struct object, this);
object_destroy(o);
}
object_destroy(impl->root);
dbus_connection_unref(impl->conn);
free(impl);
}
struct spa_dbus_local_object *spa_dbus_object_manager_register(struct spa_dbus_object_manager *this,
const char *path,
const struct spa_dbus_local_interface *interfaces,
size_t object_size, void *user_data)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
struct object *o;
int root_len = strlen(this->path);
if (!(spa_strstartswith(path, this->path) && path[root_len] == '/' &&
path[root_len + 1] != '\0')) {
errno = EINVAL;
return NULL;
}
o = object_new(impl, path, interfaces, object_size, user_data);
if (o == NULL)
return NULL;
return &o->this;
}
void spa_dbus_object_manager_unregister(struct spa_dbus_object_manager *this,
struct spa_dbus_local_object *object)
{
struct object *o = SPA_CONTAINER_OF(object, struct object, this);
object_destroy(o);
}
struct spa_dbus_local_object *spa_dbus_object_manager_find(struct spa_dbus_object_manager *this,
const char *path)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
struct object *o;
o = object_find(impl, path);
if (o)
return &o->this;
return NULL;
}
int spa_dbus_object_manager_properties_changed(struct spa_dbus_object_manager *this,
struct spa_dbus_local_object *object,
const struct spa_dbus_local_interface *interface,
const struct spa_dbus_property *properties)
{
struct object *o = SPA_CONTAINER_OF(object, struct object, this);
return object_signal_properties_changed(o, interface, properties);
}

188
spa/plugins/bluez5/dbus-manager.h
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@ -1,188 +0,0 @@
/* Spa dbus
*
* Copyright © 2022 Pauli Virtanen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef SPA_DBUS_MANAGER_H_
#define SPA_DBUS_MANAGER_H_
#include <dbus/dbus.h>
#include <spa/utils/list.h>
#include <spa/support/log.h>
struct spa_dbus_local_object;
/** DBus object manager */
struct spa_dbus_object_manager
{
/** Root DBus object path */
const char *path;
/** List (non-mutable) of objects. */
struct spa_list object_list;
};
/** DBus property specification a local DBus object. */
struct spa_dbus_property
{
const char *name; /**< Name of property */
const char *signature; /**< DBus type signature of the value */
/**
* Hook to append bare DBus value to the iterator.
* If NULL, the property is considered to not be readable.
*/
int (*get)(struct spa_dbus_local_object *object, DBusMessageIter *value);
/**
* Hook to get DBus value from the iterator, and apply it.
* If NULL, the property is considered read-only.
*/
int (*set)(struct spa_dbus_local_object *object, DBusMessageIter *value);
/**
* Hook to check if the property currently exists.
* If NULL, the property always exists.
*/
bool (*exists)(struct spa_dbus_local_object *object);
};
/** DBus method specification for a local DBus object. */
struct spa_dbus_method
{
const char *name; /**< Name of method */
/** Hook to react and reply to DBus method call */
DBusMessage *(*call)(struct spa_dbus_local_object *object, DBusMessage *m);
};
/** DBus interface specification for a local DBus object. */
struct spa_dbus_local_interface
{
/** Name of the DBus interface */
const char *name;
/** Array of properties, zero-terminated */
const struct spa_dbus_property *properties;
/** Array of methods, zero-terminated */
const struct spa_dbus_method *methods;
/**
* Hook called when initializing the object, before
* calling any other hooks.
*/
void (*init)(struct spa_dbus_local_object *object);
/**
* Hook called once when interface is destroyed.
* No other hooks are called after this.
*/
void (*destroy)(struct spa_dbus_local_object *object);
};
/**
* DBus local object structure.
*
* One object struct exists for each registered object path. The same object
* struct may have multiple interfaces. The object structures are owned,
* allocated and freed by the object manager.
*
* A custom object struct can also be used, for example
*
* struct my_local_object {
* struct spa_dbus_local_object object;
* int my_extra_value;
* };
*
* Its initialization and teardown can be done via the interface
* init/destroy hooks. Note that the hooks of all interfaces
* the object has are called on the same object struct.
*
* The struct size is specified in the call to
* spa_dbus_object_manager_register.
*/
struct spa_dbus_local_object
{
struct spa_list link; /**< Link (non-mutable) to manager object list */
const char *path; /**< DBus object path */
/** Zero-terminated array of the DBus interfaces of the objects */
const struct spa_dbus_local_interface *interfaces;
/** Pointer passed to spa_dbus_object_manager_register */
void *user_data;
};
/**
* Create and register new DBus object manager at the given object path.
*
* Registers a DBus object with the object manager interface at the given path.
*
* \param conn DBus connection.
* \param path Object path to register the new manager at.
* \param log Logging output.
*/
struct spa_dbus_object_manager *spa_dbus_object_manager_new(DBusConnection *conn, const char *path, struct spa_log *log);
/** Destroy and unregister the object manager and all objects owned by it. */
void spa_dbus_object_manager_destroy(struct spa_dbus_object_manager *manager);
/**
* Create and register a new DBus object under the object manager.
*
* The DBus object path must be a sub-path of the object manager path.
*
* \param manager Manager that owns the new object.
* \param path DBus object path.
* \param interfaces Zero-terminated array of interfaces for the new object.
* \param object_size Size of the object struct. Must be >= sizeof(struct spa_dbus_local_object).
* \param user_data User data pointer to set in the object.
*/
struct spa_dbus_local_object *spa_dbus_object_manager_register(struct spa_dbus_object_manager *manager,
const char *path,
const struct spa_dbus_local_interface *interfaces,
size_t object_size, void *user_data);
/** Find previously registered local DBus object by object path */
struct spa_dbus_local_object *spa_dbus_object_manager_find(struct spa_dbus_object_manager *manager,
const char *path);
/** Unregister and destroy a previously registered local DBus object */
void spa_dbus_object_manager_unregister(struct spa_dbus_object_manager *manager,
struct spa_dbus_local_object *object);
/**
* Emit PropertiesChanged signal for a previously registered local DBus object.
*
* \param manager Object manager
* \param object The DBus object
* \param interface The interface to emit the signal for
* \param properties Zero-terminated array of properties that were changed
*/
int spa_dbus_object_manager_properties_changed(struct spa_dbus_object_manager *manager,
struct spa_dbus_local_object *object,
const struct spa_dbus_local_interface *interface,
const struct spa_dbus_property *properties);
#endif

717
spa/plugins/bluez5/dbus-monitor.c
View file

@ -1,717 +0,0 @@
/* Spa dbus
*
* Copyright © 2022 Pauli Virtanen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <errno.h>
#include <stddef.h>
#include <stdalign.h>
#include <dbus/dbus.h>
#include <spa/support/log.h>
#include <spa/utils/hook.h>
#include <spa/utils/list.h>
#include <spa/utils/string.h>
#include "dbus-monitor.h"
#undef SPA_LOG_TOPIC_DEFAULT
#define SPA_LOG_TOPIC_DEFAULT (&impl->log_topic)
#define DBUS_INTERFACE_OBJECT_MANAGER "org.freedesktop.DBus.ObjectManager"
struct impl
{
struct spa_dbus_monitor this;
DBusConnection *conn;
struct spa_log_topic log_topic;
struct spa_log *log;
struct spa_dbus_async_call get_managed_objects_call;
unsigned int objects_listed:1;
struct spa_list objects[];
};
struct object
{
unsigned int removed:1;
unsigned int updating:1;
struct spa_dbus_object alignas(max_align_t) this;
};
static void object_emit_update(struct object *o)
{
if (o->this.interface->update)
o->this.interface->update(&o->this);
}
static void object_emit_remove(struct object *o)
{
if (o->this.interface->remove)
o->this.interface->remove(&o->this);
}
static void object_emit_property(struct object *o, const char *key, DBusMessageIter *value)
{
if (o->this.interface->property)
o->this.interface->property(&o->this, key, value);
}
static struct object *object_new(struct impl *impl, const struct spa_dbus_interface *iface,
struct spa_list *object_list, const char *path)
{
struct object *o;
spa_assert(iface->object_size >= sizeof(struct spa_dbus_object));
o = calloc(1, sizeof(struct object) + iface->object_size - sizeof(struct spa_dbus_object));
if (o == NULL)
return NULL;
o->this.path = strdup(path);
o->this.interface = iface;
o->this.user_data = impl->this.user_data;
spa_assert(o->this.path);
spa_list_append(object_list, &o->this.link);
return o;
}
static void object_remove(struct object *o)
{
if (o->removed)
return;
o->updating = true;
o->removed = true;
object_emit_remove(o);
spa_list_remove(&o->this.link);
}
static void object_destroy(struct object *o)
{
object_remove(o);
free((void *)o->this.path);
free(o);
}
static const struct spa_dbus_interface *interface_find(struct impl *impl, const char *interface, struct spa_list **objects)
{
const struct spa_dbus_interface *iface;
size_t i;
for (iface = impl->this.interfaces, i = 0; iface && iface->name; ++iface, ++i) {
if (spa_streq(iface->name, interface)) {
*objects = &impl->objects[i];
return iface;
}
}
return NULL;
}
static struct object *object_find(struct spa_list *object_list, const char *path)
{
struct spa_dbus_object *object;
spa_list_for_each(object, object_list, link) {
struct object *o = SPA_CONTAINER_OF(object, struct object, this);
if (spa_streq(o->this.path, path))
return o;
}
return NULL;
}
static int object_update_props(struct impl *impl,
struct object *o,
DBusMessageIter *props_iter,
DBusMessageIter *invalidated_iter)
{
o->updating = true;
if (o->this.interface->property) {
while (invalidated_iter && dbus_message_iter_get_arg_type(invalidated_iter) != DBUS_TYPE_INVALID) {
const char *key;
dbus_message_iter_get_basic(invalidated_iter, &key);
object_emit_property(o, key, NULL);
if (o->removed)
goto removed;
dbus_message_iter_next(invalidated_iter);
}
while (props_iter && dbus_message_iter_get_arg_type(props_iter) != DBUS_TYPE_INVALID) {
DBusMessageIter entry, value;
const char *key;
dbus_message_iter_recurse(props_iter, &entry);
dbus_message_iter_get_basic(&entry, &key);
dbus_message_iter_next(&entry);
dbus_message_iter_recurse(&entry, &value);
object_emit_property(o, key, &value);
if (o->removed)
goto removed;
dbus_message_iter_next(props_iter);
}
}
object_emit_update(o);
if (o->removed)
goto removed;
o->updating = false;
return 0;
removed:
object_destroy(o);
return 0;
}
static void interface_added(struct impl *impl,
const char *object_path,
const char *interface_name,
DBusMessageIter *props_iter)
{
struct object *o;
const struct spa_dbus_interface *iface;
struct spa_list *object_list;
iface = interface_find(impl, interface_name, &object_list);
if (!iface) {
spa_log_trace(impl->log, "dbus: skip path=%s, interface=%s",
object_path, interface_name);
return;
}
spa_log_debug(impl->log, "dbus: added path=%s, interface=%s", object_path, interface_name);
o = object_find(object_list, object_path);
if (o == NULL) {
o = object_new(impl, iface, object_list, object_path);
if (o == NULL) {
spa_log_warn(impl->log, "can't create object: %m");
return;
}
}
object_update_props(impl, o, props_iter, NULL);
}
static void interfaces_added(struct impl *impl, DBusMessageIter *arg_iter)
{
DBusMessageIter it[3];
const char *object_path;
dbus_message_iter_get_basic(arg_iter, &object_path);
dbus_message_iter_next(arg_iter);
dbus_message_iter_recurse(arg_iter, &it[0]);
while (dbus_message_iter_get_arg_type(&it[0]) != DBUS_TYPE_INVALID) {
const char *interface_name;
dbus_message_iter_recurse(&it[0], &it[1]);
dbus_message_iter_get_basic(&it[1], &interface_name);
dbus_message_iter_next(&it[1]);
dbus_message_iter_recurse(&it[1], &it[2]);
interface_added(impl, object_path, interface_name, &it[2]);
dbus_message_iter_next(&it[0]);
}
}
static void interfaces_removed(struct impl *impl, DBusMessageIter *arg_iter)
{
const char *object_path;
DBusMessageIter it;
dbus_message_iter_get_basic(arg_iter, &object_path);
dbus_message_iter_next(arg_iter);
dbus_message_iter_recurse(arg_iter, &it);
while (dbus_message_iter_get_arg_type(&it) != DBUS_TYPE_INVALID) {
const char *interface_name;
const struct spa_dbus_interface *iface;
struct spa_list *object_list;
dbus_message_iter_get_basic(&it, &interface_name);
iface = interface_find(impl, interface_name, &object_list);
if (iface) {
struct object *o;
spa_log_debug(impl->log, "dbus: removed path=%s, interface=%s",
object_path, interface_name);
o = object_find(object_list, object_path);
if (o)
object_destroy(o);
} else {
spa_log_trace(impl->log, "dbus: skip removed path=%s, interface=%s",
object_path, interface_name);
}
dbus_message_iter_next(&it);
}
}
static void get_managed_objects_reply(struct spa_dbus_async_call *call, DBusMessage *r)
{
struct impl *impl = SPA_CONTAINER_OF(call, struct impl, get_managed_objects_call);
DBusMessageIter it[6];
if (dbus_message_is_error(r, DBUS_ERROR_UNKNOWN_METHOD)) {
spa_log_warn(impl->log, "ObjectManager not available at path=%s",
impl->this.path);
return;
}
if (dbus_message_get_type(r) == DBUS_MESSAGE_TYPE_ERROR) {
spa_log_error(impl->log, "GetManagedObjects() at %s failed: %s",
impl->this.path, dbus_message_get_error_name(r));
return;
}
if (!dbus_message_iter_init(r, &it[0]) ||
!dbus_message_has_signature(r, "a{oa{sa{sv}}}")) {
spa_log_error(impl->log, "Invalid reply signature for GetManagedObjects() at %s",
impl->this.path);
return;
}
/* Add fake object representing the service itself */
interface_added(impl, impl->this.path, SPA_DBUS_MONITOR_NAME_OWNER_INTERFACE, NULL);
dbus_message_iter_recurse(&it[0], &it[1]);
while (dbus_message_iter_get_arg_type(&it[1]) != DBUS_TYPE_INVALID) {
dbus_message_iter_recurse(&it[1], &it[2]);
interfaces_added(impl, &it[2]);
dbus_message_iter_next(&it[1]);
}
impl->objects_listed = true;
}
static int get_managed_objects(struct impl *impl)
{
DBusMessage *m;
if (impl->objects_listed || impl->get_managed_objects_call.pending)
return 0;
m = dbus_message_new_method_call(impl->this.service,
impl->this.path,
DBUS_INTERFACE_OBJECT_MANAGER,
"GetManagedObjects");
if (m == NULL)
return -ENOMEM;
dbus_message_set_auto_start(m, false);
return spa_dbus_async_call_send(&impl->get_managed_objects_call, impl->conn, m,
get_managed_objects_reply);
}
static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *m, void *user_data)
{
struct impl *impl = user_data;
DBusError err = DBUS_ERROR_INIT;
if (dbus_message_is_signal(m, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
const char *name, *old_owner, *new_owner;
bool has_old_owner, has_new_owner;
spa_log_debug(impl->log, "dbus: name owner changed %s", dbus_message_get_path(m));
if (!dbus_message_get_args(m, &err,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_STRING, &old_owner,
DBUS_TYPE_STRING, &new_owner,
DBUS_TYPE_INVALID)) {
spa_log_error(impl->log,
"Failed to parse org.freedesktop.DBus.NameOwnerChanged: %s",
err.message);
goto done;
}
if (!spa_streq(name, impl->this.service))
goto done;
has_old_owner = old_owner && *old_owner;
has_new_owner = new_owner && *new_owner;
if (has_old_owner)
spa_log_debug(impl->log, "dbus: %s disappeared", impl->this.service);
if (has_old_owner || has_new_owner) {
size_t i;
const struct spa_dbus_interface *iface;
impl->objects_listed = false;
for (iface = impl->this.interfaces, i = 0; iface && iface->name; ++iface, ++i) {
struct spa_dbus_object *object;
spa_list_consume(object, &impl->objects[i], link) {
struct object *o = SPA_CONTAINER_OF(object, struct object, this);
object_destroy(o);
}
}
}
if (has_new_owner) {
spa_log_debug(impl->log, "dbus: %s appeared", impl->this.service);
get_managed_objects(impl);
}
} else if (dbus_message_is_signal(m, DBUS_INTERFACE_OBJECT_MANAGER, "InterfacesAdded")) {
DBusMessageIter it;
spa_log_debug(impl->log, "dbus: interfaces added on path=%s", dbus_message_get_path(m));
if (!impl->objects_listed)
goto done;
if (!dbus_message_iter_init(m, &it) || !dbus_message_has_signature(m, "oa{sa{sv}}")) {
spa_log_error(impl->log, "Invalid signature found in InterfacesAdded");
goto done;
}
interfaces_added(impl, &it);
} else if (dbus_message_is_signal(m, DBUS_INTERFACE_OBJECT_MANAGER, "InterfacesRemoved")) {
DBusMessageIter it;
spa_log_debug(impl->log, "dbus: interfaces removed on path=%s", dbus_message_get_path(m));
if (!impl->objects_listed)
goto done;
if (!dbus_message_iter_init(m, &it) || !dbus_message_has_signature(m, "oas")) {
spa_log_error(impl->log, "Invalid signature found in InterfacesRemoved");
goto done;
}
interfaces_removed(impl, &it);
} else if (dbus_message_is_signal(m, DBUS_INTERFACE_PROPERTIES, "PropertiesChanged")) {
DBusMessageIter args, props, invalidated;
const char *interface_name, *path;
const struct spa_dbus_interface *iface;
struct spa_list *object_list;
if (!impl->objects_listed)
goto done;
if (!dbus_message_iter_init(m, &args) ||
!dbus_message_has_signature(m, "sa{sv}as")) {
spa_log_error(impl->log, "Invalid signature found in PropertiesChanged");
goto done;
}
path = dbus_message_get_path(m);
dbus_message_iter_get_basic(&args, &interface_name);
dbus_message_iter_next(&args);
dbus_message_iter_recurse(&args, &props);
dbus_message_iter_next(&args);
dbus_message_iter_recurse(&args, &invalidated);
iface = interface_find(impl, interface_name, &object_list);
if (iface) {
struct object *o;
o = object_find(object_list, path);
if (o == NULL) {
spa_log_debug(impl->log, "Properties changed in unknown object %s",
path);
goto done;
}
spa_log_debug(impl->log, "dbus: properties changed in path=%s", path);
object_update_props(impl, o, &props, &invalidated);
}
}
done:
dbus_error_free(&err);
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
static int add_filters(struct impl *impl)
{
DBusError err = DBUS_ERROR_INIT;
char rule[1024];
const struct spa_dbus_interface *iface;
if (!dbus_connection_add_filter(impl->conn, filter_cb, impl, NULL)) {
spa_log_error(impl->log, "failed to add DBus filter");
return -EIO;
}
spa_scnprintf(rule, sizeof(rule),
"type='signal',sender='org.freedesktop.DBus',"
"interface='org.freedesktop.DBus',member='NameOwnerChanged',"
"arg0='%s'",
impl->this.service);
spa_log_trace(impl->log, "add match: %s", rule);
dbus_bus_add_match(impl->conn, rule, &err);
if (dbus_error_is_set(&err))
goto fail;
spa_scnprintf(rule, sizeof(rule),
"type='signal',sender='%s',"
"interface='org.freedesktop.DBus.ObjectManager',member='InterfacesAdded'",
impl->this.service);
spa_log_trace(impl->log, "add match: %s", rule);
dbus_bus_add_match(impl->conn, rule, &err);
if (dbus_error_is_set(&err))
goto fail;
spa_scnprintf(rule, sizeof(rule),
"type='signal',sender='%s',"
"interface='org.freedesktop.DBus.ObjectManager',member='InterfacesRemoved'",
impl->this.service);
spa_log_trace(impl->log, "add match: %s", rule);
dbus_bus_add_match(impl->conn, rule, &err);
if (dbus_error_is_set(&err))
goto fail;
for (iface = impl->this.interfaces; iface && iface->name; ++iface) {
spa_scnprintf(rule, sizeof(rule),
"type='signal',sender='%s',"
"interface='org.freedesktop.DBus.Properties',member='PropertiesChanged',"
"arg0='%s'",
impl->this.service, iface->name);
spa_log_trace(impl->log, "add match: %s", rule);
dbus_bus_add_match(impl->conn, rule, &err);
if (dbus_error_is_set(&err))
goto fail;
}
dbus_error_free(&err);
return 0;
fail:
dbus_connection_remove_filter(impl->conn, filter_cb, impl);
spa_log_error(impl->log, "failed to add DBus match: %s", err.message);
dbus_error_free(&err);
return -EIO;
}
struct spa_dbus_monitor *spa_dbus_monitor_new(DBusConnection *conn,
const char *service,
const char *path,
const struct spa_dbus_interface *interfaces,
struct spa_log *log,
void *user_data)
{
struct impl *impl;
const struct spa_dbus_interface *iface;
size_t num_interfaces = 0, i;
int res;
for (iface = interfaces; iface && iface->name; ++iface) {
spa_assert(iface->object_size >= sizeof(struct spa_dbus_object));
++num_interfaces;
}
impl = calloc(1, sizeof(struct impl) + sizeof(struct spa_list) * num_interfaces);
if (impl == NULL)
return NULL;
impl->conn = conn;
impl->this.service = strdup(service);
impl->this.path = strdup(path);
impl->this.interfaces = interfaces;
impl->this.user_data = user_data;
impl->log = log;
impl->log_topic = SPA_LOG_TOPIC(0, "spa.bluez5.dbus");
spa_log_topic_init(impl->log, &impl->log_topic);
for (i = 0; i < num_interfaces; ++i)
spa_list_init(&impl->objects[i]);
spa_assert(impl->this.service);
spa_assert(impl->this.path);
if ((res = add_filters(impl)) < 0) {
free((void *)impl->this.service);
free((void *)impl->this.path);
free(impl);
errno = -res;
return NULL;
}
dbus_connection_ref(conn);
get_managed_objects(impl);
return &impl->this;
}
void spa_dbus_monitor_destroy(struct spa_dbus_monitor *this)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
const struct spa_dbus_interface *iface;
struct spa_dbus_object *object;
size_t i;
dbus_connection_remove_filter(impl->conn, filter_cb, impl);
spa_dbus_async_call_cancel(&impl->get_managed_objects_call);
for (iface = impl->this.interfaces, i = 0; iface && iface->name; ++iface, ++i) {
spa_list_consume(object, &impl->objects[i], link) {
struct object *o = SPA_CONTAINER_OF(object, struct object, this);
object_destroy(o);
}
}
dbus_connection_unref(impl->conn);
free((void *)impl->this.service);
free((void *)impl->this.path);
free(impl);
}
struct spa_dbus_object *spa_dbus_monitor_find(struct spa_dbus_monitor *this, const char *path, const char *interface)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
struct object *o;
const struct spa_dbus_interface *iface;
struct spa_list *object_list;
if (path == NULL)
return NULL;
spa_assert(interface);
iface = interface_find(impl, interface, &object_list);
if (!iface)
return NULL;
o = object_find(object_list, path);
if (o)
return &o->this;
return NULL;
}
void spa_dbus_monitor_ignore_object(struct spa_dbus_monitor *this, struct spa_dbus_object *object)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
struct object *o = SPA_CONTAINER_OF(object, struct object, this);
spa_log_trace(impl->log, "ignore path=%s", o->this.path);
if (o->updating)
object_remove(o);
else
object_destroy(o);
}
struct spa_list *spa_dbus_monitor_object_list(struct spa_dbus_monitor *this, const char *interface)
{
struct impl *impl = SPA_CONTAINER_OF(this, struct impl, this);
const struct spa_dbus_interface *iface;
struct spa_list *object_list;
iface = interface_find(impl, interface, &object_list);
if (!iface)
return NULL;
return object_list;
}
static void async_call_reply(DBusPendingCall *pending, void *user_data)
{
struct spa_dbus_async_call *call = user_data;
DBusMessage *r;
spa_assert(pending == call->pending);
call->pending = NULL;
r = dbus_pending_call_steal_reply(pending);
dbus_pending_call_unref(pending);
spa_assert(call->reply != NULL);
if (r == NULL)
return;
call->reply(call, r);
dbus_message_unref(r);
}
int spa_dbus_async_call_send(struct spa_dbus_async_call *call,
DBusConnection *conn, DBusMessage *msg,
void (*reply)(struct spa_dbus_async_call *call, DBusMessage *reply))
{
int res = -EIO;
DBusPendingCall *pending;
spa_assert(msg);
spa_assert(conn);
spa_assert(call);
if (call->pending) {
res = -EBUSY;
goto done;
}
if (!dbus_connection_send_with_reply(conn, msg, &pending, -1))
goto done;
if (!dbus_pending_call_set_notify(pending, async_call_reply, call, NULL)) {
dbus_pending_call_cancel(pending);
dbus_pending_call_unref(pending);
goto done;
}
call->reply = reply;
call->pending = pending;
res = 0;
done:
dbus_message_unref(msg);
return res;
}

173
spa/plugins/bluez5/dbus-monitor.h
View file

@ -1,173 +0,0 @@
/* Spa dbus
*
* Copyright © 2022 Pauli Virtanen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef SPA_DBUS_MONITOR_H_
#define SPA_DBUS_MONITOR_H_
#include <dbus/dbus.h>
#include <spa/utils/list.h>
#include <spa/support/log.h>
struct spa_dbus_object;
/**
* DBus interface specification.
*/
struct spa_dbus_interface {
/** DBus interface name. */
const char *name;
/** Size of object struct. Must be at least sizeof(struct spa_dbus_object). */
const size_t object_size;
/** Property value updated. */
void (*property) (struct spa_dbus_object *object, const char *key, DBusMessageIter *value);
/** Interface at the object path added, or property updates complete. */
void (*update) (struct spa_dbus_object *object);
/**
* Interface at the object path removed.
* No other hooks will be called after this.
* The object will be deallocated after this, so any associated data,
* for example in a custom object struct, can be freed in this hook.
*/
void (*remove) (struct spa_dbus_object *object);
};
/**
* DBus object instance, for one interface.
*
* A custom object struct can be also used for each interface, specified
* as
*
* struct my_dbus_object {
* struct spa_dbus_object object;
* int some_extra_value;
* }
*
* The struct will be zero-initialized when first allocated. The object
* instances are owned by spa_dbus_monitor and allocated and freed by it.
*/
struct spa_dbus_object
{
struct spa_list link; /**< Link in interface's object list */
const char *path; /**< DBus object path */
const struct spa_dbus_interface *interface; /**< The interface of the object */
void *user_data; /**< Pointer passed in spa_dbus_monitor_new */
};
/** DBus object monitor */
struct spa_dbus_monitor
{
const char *service; /**< Service name */
const char *path; /**< Object path */
const struct spa_dbus_interface *interfaces; /**< Monitored interfaces
* (zero-terminated) */
void *user_data; /**< Pointer passed in spa_dbus_monitor_new */
};
/**
* Non-DBus interface type representing the monitored service itself.
* Can be used to track NameOwner events.
*/
#define SPA_DBUS_MONITOR_NAME_OWNER_INTERFACE "org.freedesktop.pipewire.spa.dbus.monitor.owner"
/**
* Create new object monitor.
*
* \param conn DBus connection
* \param service DBus service name to monitor
* \param path Object path to monitor
* \param interfaces Zero-terminated array of interfaces to monitor. Corresponding objects
* will be created.
* \param log Log to output to
* \param user_data User data to set in object instances.
*/
struct spa_dbus_monitor *spa_dbus_monitor_new(DBusConnection *conn,
const char *service,
const char *path,
const struct spa_dbus_interface *interfaces,
struct spa_log *log,
void *user_data);
/**
* Destroy object monitor and all interface objects owned by it.
*/
void spa_dbus_monitor_destroy(struct spa_dbus_monitor *monitor);
/** Find interface object by name */
struct spa_dbus_object *spa_dbus_monitor_find(struct spa_dbus_monitor *monitor,
const char *path, const char *interface);
/** Destroy an object, and don't receive further updates concerning it. */
void spa_dbus_monitor_ignore_object(struct spa_dbus_monitor *monitor,
struct spa_dbus_object *object);
/**
* Get the object list for the named interface.
*
* The returned list is not mutable.
*
* \param monitor The DBus monitor.
* \param interface Interface name. Must be one of those monitored.
*/
struct spa_list *spa_dbus_monitor_object_list(struct spa_dbus_monitor *monitor,
const char *interface);
struct spa_dbus_async_call
{
DBusPendingCall *pending;
void (*reply)(struct spa_dbus_async_call *call, DBusMessage *reply);
};
/**
* Make an asynchronous DBus call.
*
* On successful return, call contains the pending call handle.
* The same address is passed to the reply function, and can be used
* to locate the address container object. The reply function shall not
* unref the reply.
*
* The msg passed in is stolen, and unref'd also on errors.
*
* \returns 0 on success, < 0 on error.
*/
int spa_dbus_async_call_send(struct spa_dbus_async_call *call,
DBusConnection *conn, DBusMessage *msg,
void (*reply)(struct spa_dbus_async_call *call, DBusMessage *reply));
/** Convenience for pending call cancel + unref */
static inline void spa_dbus_async_call_cancel(struct spa_dbus_async_call *call)
{
if (call->pending) {
dbus_pending_call_cancel(call->pending);
dbus_pending_call_unref(call->pending);
spa_zero(*call);
}
}
#endif