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|
use arg;
use {Message, MessageType, BusName, Path, Interface, Member, MatchRule};
/// Helper methods for structs representing a Signal
///
/// # Example
///
/// Listen to InterfacesRemoved signal from org.bluez.obex.
///
/// ```rust,no_run
/// use dbus::{Connection, BusType, SignalArgs};
/// use dbus::stdintf::org_freedesktop_dbus::ObjectManagerInterfacesRemoved as IR;
///
/// let c = Connection::get_private(BusType::Session).unwrap();
/// // Add a match for this signal
/// let mstr = IR::match_str(Some(&"org.bluez.obex".into()), None);
/// c.add_match(&mstr).unwrap();
///
/// // Wait for the signal to arrive.
/// for msg in c.incoming(1000) {
/// if let Some(ir) = IR::from_message(&msg) {
/// println!("Interfaces {:?} have been removed from bluez on path {}.", ir.interfaces, ir.object);
/// }
/// }
/// ```
pub trait SignalArgs: Default {
/// D-Bus name of signal
const NAME: &'static str;
/// D-Bus name of interface this signal belongs to
const INTERFACE: &'static str;
/// Low-level method for appending this struct to a message.
///
/// You're more likely to use one of the more high level functions.
fn append(&self, i: &mut arg::IterAppend);
/// Low-level method for getting arguments from a message.
///
/// You're more likely to use one of the more high level functions.
fn get(&mut self, i: &mut arg::Iter) -> Result<(), arg::TypeMismatchError>;
/// Returns a message that emits the signal.
fn to_emit_message(&self, path: &Path) -> Message {
let mut m = Message::signal(path, &Interface::from(Self::INTERFACE), &Member::from(Self::NAME));
self.append(&mut arg::IterAppend::new(&mut m));
m
}
/// If the message is a signal of the correct type, return its arguments, otherwise return None.
///
/// This does not check sender and path of the message, which is likely relevant to you as well.
fn from_message(m: &Message) -> Option<Self> {
if m.msg_type() != MessageType::Signal { None }
else if m.interface().as_ref().map(|x| &**x) != Some(Self::INTERFACE) { None }
else if m.member().as_ref().map(|x| &**x) != Some(Self::NAME) { None }
else {
let mut z: Self = Default::default();
z.get(&mut m.iter_init()).ok().map(|_| z)
}
}
/// Returns a match rule matching this signal.
///
/// If sender and/or path is None, matches all senders and/or paths.
fn match_rule<'a>(sender: Option<&'a BusName>, path: Option<&'a Path>) -> MatchRule<'a> {
let mut m: MatchRule = Default::default();
m.sender = sender.map(|x| x.clone());
m.path = path.map(|x| x.clone());
m.msg_type = Some(MessageType::Signal);
m.interface = Some(Self::INTERFACE.into());
m.member = Some(Self::NAME.into());
m
}
/// Returns a string that can be sent to `Connection::add_match`.
///
/// If sender and/or path is None, matches all senders and/or paths.
fn match_str(sender: Option<&BusName>, path: Option<&Path>) -> String {
Self::match_rule(sender, path).match_str()
}
}
#[test]
fn intf_removed() {
use {Connection, BusType};
use stdintf::org_freedesktop_dbus::ObjectManagerInterfacesRemoved as IR;
let c = Connection::get_private(BusType::Session).unwrap();
let mstr = IR::match_str(Some(&c.unique_name().into()), Some(&"/hello".into()));
println!("Match str: {}", mstr);
c.add_match(&mstr).unwrap();
let ir = IR { object: "/hello".into(), interfaces: vec!("ABC.DEF".into(), "GHI.JKL".into()) };
let cp = c.with_path("dbus.dummy", "/hello", 2000);
cp.emit(&ir).unwrap();
for msg in c.incoming(1000) {
if &*msg.sender().unwrap() != &*c.unique_name() { continue; }
if let Some(ir2) = IR::from_message(&msg) {
assert_eq!(ir2.object, ir.object);
assert_eq!(ir2.interfaces, ir.interfaces);
break;
}
}
}
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