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use core::{fmt, slice};
use managed::ManagedSlice;
use super::{Socket, SocketRef, AnySocket};
#[cfg(feature = "socket-tcp")]
use super::TcpState;
#[derive(Debug)]
pub struct Item<'a, 'b: 'a> {
socket: Socket<'a, 'b>,
refs: usize
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Default, Hash)]
pub struct Handle(usize);
impl fmt::Display for Handle {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "#{}", self.0)
}
}
#[derive(Debug)]
pub struct Set<'a, 'b: 'a, 'c: 'a + 'b> {
sockets: ManagedSlice<'a, Option<Item<'b, 'c>>>
}
impl<'a, 'b: 'a, 'c: 'a + 'b> Set<'a, 'b, 'c> {
pub fn new<SocketsT>(sockets: SocketsT) -> Set<'a, 'b, 'c>
where SocketsT: Into<ManagedSlice<'a, Option<Item<'b, 'c>>>> {
let sockets = sockets.into();
Set {
sockets: sockets
}
}
pub fn add<T>(&mut self, socket: T) -> Handle
where T: Into<Socket<'b, 'c>>
{
fn put<'b, 'c>(index: usize, slot: &mut Option<Item<'b, 'c>>,
mut socket: Socket<'b, 'c>) -> Handle {
net_trace!("[{}]: adding", index);
let handle = Handle(index);
socket.meta_mut().handle = handle;
*slot = Some(Item { socket: socket, refs: 1 });
handle
}
let socket = socket.into();
for (index, slot) in self.sockets.iter_mut().enumerate() {
if slot.is_none() {
return put(index, slot, socket)
}
}
match self.sockets {
ManagedSlice::Borrowed(_) => {
panic!("adding a socket to a full SocketSet")
}
#[cfg(any(feature = "std", feature = "alloc"))]
ManagedSlice::Owned(ref mut sockets) => {
sockets.push(None);
let index = sockets.len() - 1;
return put(index, &mut sockets[index], socket)
}
}
}
pub fn get<T: AnySocket<'b, 'c>>(&mut self, handle: Handle) -> SocketRef<T> {
match self.sockets[handle.0].as_mut() {
Some(item) => {
T::downcast(SocketRef::new(&mut item.socket))
.expect("handle refers to a socket of a wrong type")
}
None => panic!("handle does not refer to a valid socket")
}
}
pub fn remove(&mut self, handle: Handle) -> Socket<'b, 'c> {
net_trace!("[{}]: removing", handle.0);
match self.sockets[handle.0].take() {
Some(item) => item.socket,
None => panic!("handle does not refer to a valid socket")
}
}
pub fn retain(&mut self, handle: Handle) {
self.sockets[handle.0]
.as_mut()
.expect("handle does not refer to a valid socket")
.refs += 1
}
pub fn release(&mut self, handle: Handle) {
let refs = &mut self.sockets[handle.0]
.as_mut()
.expect("handle does not refer to a valid socket")
.refs;
if *refs == 0 { panic!("decreasing reference count past zero") }
*refs -= 1
}
pub fn prune(&mut self) {
for (index, item) in self.sockets.iter_mut().enumerate() {
let mut may_remove = false;
if let &mut Some(Item { refs: 0, ref mut socket }) = item {
match socket {
#[cfg(feature = "socket-raw")]
&mut Socket::Raw(_) =>
may_remove = true,
#[cfg(all(feature = "socket-icmp", any(feature = "proto-ipv4", feature = "proto-ipv6")))]
&mut Socket::Icmp(_) =>
may_remove = true,
#[cfg(feature = "socket-udp")]
&mut Socket::Udp(_) =>
may_remove = true,
#[cfg(feature = "socket-tcp")]
&mut Socket::Tcp(ref mut socket) =>
if socket.state() == TcpState::Closed {
may_remove = true
} else {
socket.close()
},
&mut Socket::__Nonexhaustive(_) => unreachable!()
}
}
if may_remove {
net_trace!("[{}]: pruning", index);
*item = None
}
}
}
pub fn iter<'d>(&'d self) -> Iter<'d, 'b, 'c> {
Iter { lower: self.sockets.iter() }
}
pub fn iter_mut<'d>(&'d mut self) -> IterMut<'d, 'b, 'c> {
IterMut { lower: self.sockets.iter_mut() }
}
}
pub struct Iter<'a, 'b: 'a, 'c: 'a + 'b> {
lower: slice::Iter<'a, Option<Item<'b, 'c>>>
}
impl<'a, 'b: 'a, 'c: 'a + 'b> Iterator for Iter<'a, 'b, 'c> {
type Item = &'a Socket<'b, 'c>;
fn next(&mut self) -> Option<Self::Item> {
while let Some(item_opt) = self.lower.next() {
if let Some(item) = item_opt.as_ref() {
return Some(&item.socket)
}
}
None
}
}
pub struct IterMut<'a, 'b: 'a, 'c: 'a + 'b> {
lower: slice::IterMut<'a, Option<Item<'b, 'c>>>,
}
impl<'a, 'b: 'a, 'c: 'a + 'b> Iterator for IterMut<'a, 'b, 'c> {
type Item = SocketRef<'a, Socket<'b, 'c>>;
fn next(&mut self) -> Option<Self::Item> {
while let Some(item_opt) = self.lower.next() {
if let Some(item) = item_opt.as_mut() {
return Some(SocketRef::new(&mut item.socket))
}
}
None
}
}