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mod links;
mod packet;
mod protocols;
mod route;
use crate::link::Link;
use alloc::boxed::Box;
use links::Links;
pub use packet::Id;
use packet::{Field, Packet};
use protocols::{Protocols, RecvCallback};
use route::Routes;
use spin::RwLock;
lazy_static! {
pub static ref NET: Net = Net {
relay: RwLock::new(false),
id: RwLock::new([0; 8]),
routes: RwLock::new(Routes::new()),
links: RwLock::new(Links::new()),
protocols: RwLock::new(Protocols::new()),
};
}
pub const ID_PARENT: Id = [0; 8];
pub const ID_CHILD: Id = [0xFF; 8];
pub struct Net {
relay: RwLock<bool>,
id: RwLock<Id>,
routes: RwLock<Routes>,
links: RwLock<Links>,
protocols: RwLock<Protocols>,
}
impl Net {
pub fn set_id(&self, id: Id) {
let mut myid = self.id.write();
*myid = id;
}
pub fn set_relay(&self, relay: bool) {
let mut myrelay = self.relay.write();
*myrelay = relay;
}
pub fn add_link(&self, link: Link, is_parent: bool) {
link.set_recv_cb(Box::new(move |link: Link, load: &[u8]| {
NET.recv_handle(link, load);
}));
let mut links = self.links.write();
links.add(link, is_parent);
}
pub fn register_protocol(&self, id: u8, cb: Box<RecvCallback>) {
let mut protocols = self.protocols.write();
protocols.add_protocol(id, cb);
}
fn send_common(
&self,
packet: &mut Packet,
dst: Option<&Id>,
dst_link: Option<&Link>,
origin: Option<&Link>,
) {
let mut link: Option<Link> = None;
let id: &Id = if let Some(id) = dst {
packet.set_var(Field::Dst, id);
id
} else {
&packet.dst
};
if let None = dst_link {
let routes = self.routes.read();
if let Some(l) = routes.find(id) {
link = Some(l);
}
}
let buf = packet.to_buf();
if let Some(link) = link {
if let Some(origin) = origin {
if origin.eq(&link) {
return;
}
}
link.send(&buf);
} else {
if let Some(origin) = origin {
for parent in &self.links.read().parents {
if origin.eq(&parent) {
return;
}
}
}
for parent in &self.links.read().parents {
parent.send(&buf);
}
}
}
pub fn send(&self, protocol: u8, data: &[u8], id: Option<&Id>, link: Option<&Link>) {
let mut packet = Packet::new();
packet.set_var(Field::Protocol, &[protocol]);
packet.set_var(Field::Data, data);
packet.set_var(Field::Src, &*self.id.read());
packet.set_var(Field::Ttl, &[8]);
self.send_common(&mut packet, id, link, None);
}
pub fn broadcast(&self, protocol: u8, data: &[u8]) {
let mut packet = Packet::new();
packet.set_var(Field::Protocol, &[protocol]);
packet.set_var(Field::Data, data);
packet.set_var(Field::Src, &*self.id.read());
packet.set_var(Field::Dst, &ID_CHILD);
packet.set_var(Field::Ttl, &[0]);
let buf = packet.to_buf();
let routes = self.routes.read();
for (_id, route) in routes.iter() {
route.link.send(&buf);
}
}
fn recv_handle(&self, link: Link, buf: &[u8]) {
let packet = Packet::try_from_buf(buf);
let mut packet = if let Ok(packet) = packet {
packet
} else {
return;
};
self.update_route(&packet.src, &link);
if packet.dst == *self.id.read() {
let protocols = self.protocols.read();
protocols.distribute(packet.protocol, &packet.src, &packet.data);
} else if *self.relay.read() {
if packet.ttl > 0 {
packet.set_var(Field::Ttl, &[packet.ttl - 1]);
self.send_common(&mut packet, None, None, Some(&link));
} else {
}
}
}
pub fn connect(&self, id: &Id, link: &Link) {
let mut routes = self.routes.write();
routes.remove(id);
routes.update(id, link.clone());
routes.fix(id);
}
pub fn update_route(&self, id: &Id, link: &Link) {
for parent in &self.links.read().parents {
if link.eq(&parent) {
return;
}
}
let mut routes = self.routes.write();
let route = routes.find(id);
if let Some(route) = route {
if route.uid() != link.uid() {
routes.update(id, link.clone());
}
} else {
routes.update(id, link.clone());
}
}
}