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use super::{Error, ffi, libc, to_c_str, c_str_to_slice, Watch, Message, BusName, Path, ConnPath};
use super::{RequestNameReply, ReleaseNameReply, BusType, WatchEvent};
use super::watch::WatchList;
use std::{fmt, mem, ptr};
use std::collections::LinkedList;
use std::cell::{Cell, RefCell};
use std::os::unix::io::RawFd;
use std::os::raw::{c_void, c_char, c_int, c_uint};
impl WatchEvent {
pub fn from_revents(revents: libc::c_short) -> c_uint {
0 +
if (revents & libc::POLLIN) != 0 { WatchEvent::Readable as c_uint } else { 0 } +
if (revents & libc::POLLOUT) != 0 { WatchEvent::Writable as c_uint } else { 0 } +
if (revents & libc::POLLERR) != 0 { WatchEvent::Error as c_uint } else { 0 } +
if (revents & libc::POLLHUP) != 0 { WatchEvent::Hangup as c_uint } else { 0 }
}
}
#[derive(Debug)]
pub enum ConnectionItem {
Nothing,
MethodCall(Message),
Signal(Message),
MethodReturn(Message),
WatchFd(Watch),
}
pub struct ConnectionItems<'a> {
c: &'a Connection,
timeout_ms: Option<i32>,
}
impl<'a> Iterator for ConnectionItems<'a> {
type Item = ConnectionItem;
fn next(&mut self) -> Option<ConnectionItem> {
loop {
let i = self.c.i.pending_items.borrow_mut().pop_front();
if i.is_some() { return i; }
match self.timeout_ms {
Some(t) => {
let r = unsafe { ffi::dbus_connection_read_write_dispatch(self.c.conn(), t as c_int) };
if !self.c.i.pending_items.borrow().is_empty() { continue };
if r == 0 { return None; }
return Some(ConnectionItem::Nothing);
}
None => {
let r = unsafe { ffi::dbus_connection_dispatch(self.c.conn()) };
if !self.c.i.pending_items.borrow().is_empty() { continue };
if r == ffi::DBusDispatchStatus::DataRemains { continue };
if r == ffi::DBusDispatchStatus::Complete { return None };
panic!("dbus_connection_dispatch failed");
}
}
}
}
}
struct IConnection {
conn: Cell<*mut ffi::DBusConnection>,
pending_items: RefCell<LinkedList<ConnectionItem>>,
watches: Option<Box<WatchList>>,
}
pub struct Connection {
i: Box<IConnection>,
}
pub fn conn_handle(c: &Connection) -> *mut ffi::DBusConnection {
c.i.conn.get()
}
extern "C" fn filter_message_cb(conn: *mut ffi::DBusConnection, msg: *mut ffi::DBusMessage,
user_data: *mut c_void) -> ffi::DBusHandlerResult {
let m = super::message::message_from_ptr(msg, true);
let i: &IConnection = unsafe { mem::transmute(user_data) };
assert!(i.conn.get() == conn);
let mtype: ffi::DBusMessageType = unsafe { mem::transmute(ffi::dbus_message_get_type(msg)) };
let r = match mtype {
ffi::DBusMessageType::Signal => {
i.pending_items.borrow_mut().push_back(ConnectionItem::Signal(m));
ffi::DBusHandlerResult::Handled
}
ffi::DBusMessageType::MethodReturn => {
i.pending_items.borrow_mut().push_back(ConnectionItem::MethodReturn(m));
ffi::DBusHandlerResult::NotYetHandled
}
_ => ffi::DBusHandlerResult::NotYetHandled,
};
r
}
extern "C" fn object_path_message_cb(conn: *mut ffi::DBusConnection, msg: *mut ffi::DBusMessage,
user_data: *mut c_void) -> ffi::DBusHandlerResult {
let m = super::message::message_from_ptr(msg, true);
let i: &IConnection = unsafe { mem::transmute(user_data) };
assert!(i.conn.get() == conn);
i.pending_items.borrow_mut().push_back(ConnectionItem::MethodCall(m));
ffi::DBusHandlerResult::Handled
}
impl Connection {
#[inline(always)]
fn conn(&self) -> *mut ffi::DBusConnection {
self.i.conn.get()
}
pub fn get_private(bus: BusType) -> Result<Connection, Error> {
let mut e = Error::empty();
let conn = unsafe { ffi::dbus_bus_get_private(bus, e.get_mut()) };
if conn == ptr::null_mut() {
return Err(e)
}
let mut c = Connection { i: Box::new(IConnection {
conn: Cell::new(conn),
pending_items: RefCell::new(LinkedList::new()),
watches: None,
})};
unsafe { ffi::dbus_connection_set_exit_on_disconnect(conn, 0) };
assert!(unsafe {
ffi::dbus_connection_add_filter(c.conn(), Some(filter_message_cb as ffi::DBusCallback), mem::transmute(&*c.i), None)
} != 0);
let iconn: *const IConnection = &*c.i;
c.i.watches = Some(WatchList::new(&c, Box::new(move |w| {
let i: &IConnection = unsafe { mem::transmute(iconn) };
i.pending_items.borrow_mut().push_back(ConnectionItem::WatchFd(w));
})));
Ok(c)
}
pub fn send_with_reply_and_block(&self, msg: Message, timeout_ms: i32) -> Result<Message, Error> {
let mut e = Error::empty();
let response = unsafe {
ffi::dbus_connection_send_with_reply_and_block(self.conn(), super::message::get_message_ptr(&msg),
timeout_ms as c_int, e.get_mut())
};
if response == ptr::null_mut() {
return Err(e);
}
Ok(super::message::message_from_ptr(response, false))
}
pub fn send(&self, msg: Message) -> Result<u32,()> {
let mut serial = 0u32;
let r = unsafe { ffi::dbus_connection_send(self.conn(), super::message::get_message_ptr(&msg), &mut serial) };
if r == 0 { return Err(()); }
unsafe { ffi::dbus_connection_flush(self.conn()) };
Ok(serial)
}
pub fn unique_name(&self) -> String {
let c = unsafe { ffi::dbus_bus_get_unique_name(self.conn()) };
c_str_to_slice(&c).unwrap_or("").to_string()
}
pub fn iter(&self, timeout_ms: i32) -> ConnectionItems {
ConnectionItems {
c: self,
timeout_ms: Some(timeout_ms),
}
}
pub fn register_object_path(&self, path: &str) -> Result<(), Error> {
let mut e = Error::empty();
let p = to_c_str(path);
let vtable = ffi::DBusObjectPathVTable {
unregister_function: None,
message_function: Some(object_path_message_cb as ffi::DBusCallback),
dbus_internal_pad1: None,
dbus_internal_pad2: None,
dbus_internal_pad3: None,
dbus_internal_pad4: None,
};
let r = unsafe {
let user_data: *mut c_void = mem::transmute(&*self.i);
ffi::dbus_connection_try_register_object_path(self.conn(), p.as_ptr(), &vtable, user_data, e.get_mut())
};
if r == 0 { Err(e) } else { Ok(()) }
}
pub fn unregister_object_path(&self, path: &str) {
let p = to_c_str(path);
let r = unsafe { ffi::dbus_connection_unregister_object_path(self.conn(), p.as_ptr()) };
if r == 0 { panic!("Out of memory"); }
}
pub fn list_registered_object_paths(&self, path: &str) -> Vec<String> {
let p = to_c_str(path);
let mut clist: *mut *mut c_char = ptr::null_mut();
let r = unsafe { ffi::dbus_connection_list_registered(self.conn(), p.as_ptr(), &mut clist) };
if r == 0 { panic!("Out of memory"); }
let mut v = Vec::new();
let mut i = 0;
loop {
let s = unsafe {
let citer = clist.offset(i);
if *citer == ptr::null_mut() { break };
mem::transmute(citer)
};
v.push(format!("{}", c_str_to_slice(s).unwrap()));
i += 1;
}
unsafe { ffi::dbus_free_string_array(clist) };
v
}
pub fn register_name(&self, name: &str, flags: u32) -> Result<RequestNameReply, Error> {
let mut e = Error::empty();
let n = to_c_str(name);
let r = unsafe { ffi::dbus_bus_request_name(self.conn(), n.as_ptr(), flags, e.get_mut()) };
if r == -1 { Err(e) } else { Ok(unsafe { mem::transmute(r) }) }
}
pub fn release_name(&self, name: &str) -> Result<ReleaseNameReply, Error> {
let mut e = Error::empty();
let n = to_c_str(name);
let r = unsafe { ffi::dbus_bus_release_name(self.conn(), n.as_ptr(), e.get_mut()) };
if r == -1 { Err(e) } else { Ok(unsafe { mem::transmute(r) }) }
}
pub fn add_match(&self, rule: &str) -> Result<(), Error> {
let mut e = Error::empty();
let n = to_c_str(rule);
unsafe { ffi::dbus_bus_add_match(self.conn(), n.as_ptr(), e.get_mut()) };
if e.name().is_some() { Err(e) } else { Ok(()) }
}
pub fn remove_match(&self, rule: &str) -> Result<(), Error> {
let mut e = Error::empty();
let n = to_c_str(rule);
unsafe { ffi::dbus_bus_remove_match(self.conn(), n.as_ptr(), e.get_mut()) };
if e.name().is_some() { Err(e) } else { Ok(()) }
}
pub fn watch_fds(&self) -> Vec<Watch> {
self.i.watches.as_ref().unwrap().get_enabled_fds()
}
pub fn watch_handle(&self, fd: RawFd, flags: c_uint) -> ConnectionItems {
self.i.watches.as_ref().unwrap().watch_handle(fd, flags);
ConnectionItems { c: self, timeout_ms: None }
}
pub fn with_path<'a, D: Into<BusName<'a>>, P: Into<Path<'a>>>(&'a self, dest: D, path: P, timeout_ms: i32) ->
ConnPath<'a, &'a Connection> {
ConnPath { conn: self, dest: dest.into(), path: path.into(), timeout: timeout_ms }
}
}
impl Drop for Connection {
fn drop(&mut self) {
unsafe {
ffi::dbus_connection_close(self.conn());
ffi::dbus_connection_unref(self.conn());
}
}
}
impl fmt::Debug for Connection {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(f, "D-Bus Connection({})", self.unique_name())
}
}