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use crate::cla::{ClaSenderTask, ConvergenceLayerAgent};
use crate::{CLAS, CONFIG};
use bp7::EndpointID;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fmt::Display;
use std::net::IpAddr;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
#[derive(Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
pub enum PeerType {
Static,
Dynamic,
}
impl std::convert::TryFrom<&str> for PeerType {
type Error = ();
fn try_from(value: &str) -> Result<Self, Self::Error> {
match dbg!(value.to_lowercase().as_str()) {
"static" => Ok(Self::Static),
"dynamic" => Ok(Self::Dynamic),
_ => Err(()),
}
}
}
#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq, Hash)]
pub enum PeerAddress {
/// Unicast IP node, e.g., reachable via mtcp, tcp or http
Ip(IpAddr),
/// Generic peer reachable via a broadcast medium, e.g., LoRa "868_1" "node_id_1"
BroadcastGeneric(String, String),
/// Generic peer reachable via a unicast transmission, e.g., MAC address "AA:BB:CC:DD:EE:FF"
Generic(String),
}
impl From<IpAddr> for PeerAddress {
fn from(addr: IpAddr) -> Self {
PeerAddress::Ip(addr)
}
}
impl From<String> for PeerAddress {
fn from(addr: String) -> Self {
PeerAddress::Generic(addr)
}
}
impl Display for PeerAddress {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
PeerAddress::Ip(addr) => write!(f, "{}", addr),
PeerAddress::BroadcastGeneric(domain, addr) => write!(f, "{}/{}", domain, addr),
PeerAddress::Generic(addr) => write!(f, "{}", addr),
}
}
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct DtnPeer {
pub eid: EndpointID,
pub addr: PeerAddress,
pub con_type: PeerType,
pub period: Option<Duration>,
pub cla_list: Vec<(String, Option<u16>)>,
pub services: HashMap<u8, String>,
pub last_contact: u64,
pub fails: u16,
}
impl DtnPeer {
pub fn new(
eid: EndpointID,
addr: PeerAddress,
con_type: PeerType,
period: Option<Duration>,
cla_list: Vec<(String, Option<u16>)>,
services: HashMap<u8, String>,
) -> DtnPeer {
DtnPeer {
eid,
addr,
con_type,
period,
cla_list,
services,
last_contact: SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.as_secs(),
fails: 0,
}
}
/// Example
///
/// ```
/// use std::{thread, time};
/// use dtn7::core::*;
/// use dtn7::CONFIG;
///
/// let mut peer = helpers::rnd_peer();
/// let original_time = peer.last_contact;
/// thread::sleep(time::Duration::from_secs(1));
/// peer.touch();
/// assert!(original_time < peer.last_contact);
/// ```
pub fn touch(&mut self) {
self.last_contact = SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.as_secs();
}
/// Example
///
/// ```
/// use std::{thread, time::Duration};
/// use dtn7::core::*;
/// use dtn7::CONFIG;
///
/// (*CONFIG.lock()).peer_timeout = Duration::from_secs(1);
/// let mut peer = helpers::rnd_peer();
/// peer.con_type = PeerType::Dynamic;
/// assert_eq!(peer.still_valid(), true);
///
/// thread::sleep(Duration::from_secs(2));
/// assert_eq!(peer.still_valid(), false);
/// ```
pub fn still_valid(&self) -> bool {
if self.con_type == PeerType::Static {
return true;
}
// If a custom peer timeout was specified force remove all peers after specified amount of time
// Or if no custom peer timeout was specified force remove all peers after default peer timeout
// that didn't advertise a BeaconPeriod
let timeout = CONFIG.lock().peer_timeout.as_secs();
let custom = CONFIG.lock().custom_timeout;
if (custom && timeout > 0) || self.period.is_none() {
let now = SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("time went backwards")
.as_secs();
now - self.last_contact < timeout
// Else if a received beacon contains a BeaconPeriod remove this peer after 2 * received BeaconPeriod
} else {
let now = SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("Time went backwards")
.as_secs();
now - self.last_contact < self.period.unwrap().as_secs() * 2
}
}
/// Return the peers DTN node name (without URI scheme)
pub fn node_name(&self) -> String {
self.eid.node().unwrap_or_default()
}
pub fn first_cla(&self) -> Option<ClaSenderTask> {
for cla in &self.cla_list {
for cla_instance in &(*CLAS.lock()) {
if cla.0 == cla_instance.name() && cla_instance.accepting() {
let dest = format!(
"{}:{}",
self.addr,
cla.1.unwrap_or_else(|| cla_instance.port())
);
return Some(ClaSenderTask {
tx: cla_instance.channel(),
dest,
cla_name: cla_instance.name().into(),
next_hop: self.eid.clone(),
});
}
}
}
None
}
pub fn addr(&self) -> &PeerAddress {
&self.addr
}
pub fn report_fail(&mut self) {
self.fails += 1;
}
pub fn reset_fails(&mut self) {
self.fails = 0;
}
pub fn failed_too_much(&self) -> bool {
self.fails > 3
}
}