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use crate::{
compat::{collections::VecDeque, string::String, vec::Vec},
Address, Result, RouteError,
};
use core::fmt::{self, Display};
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug, Clone, Hash, Ord, PartialOrd, Eq, PartialEq)]
pub struct Route {
inner: VecDeque<Address>,
}
impl Route {
#[allow(clippy::new_ret_no_self)]
pub fn new() -> RouteBuilder<'static> {
RouteBuilder::new()
}
pub fn create<T: Into<Address>>(vt: Vec<T>) -> Self {
let mut route = Route::new();
for addr in vt {
route = route.append(addr.into());
}
route.into()
}
pub fn parse<S: Into<String>>(s: S) -> Option<Route> {
let s = s.into();
if s.is_empty() {
return None;
}
let addrs = s.split("=>").collect::<Vec<_>>();
if addrs.is_empty() {
return None;
}
Some(
addrs
.into_iter()
.fold(Route::new(), |r, addr| r.append(addr.trim()))
.into(),
)
}
pub fn modify(&mut self) -> RouteBuilder {
RouteBuilder {
inner: self.inner.clone(),
write_back: Some(self),
}
}
pub fn step(&mut self) -> Result<Address> {
self.inner
.pop_front()
.ok_or_else(|| RouteError::IncompleteRoute.into())
}
pub fn next(&self) -> Result<&Address> {
self.inner
.front()
.ok_or_else(|| RouteError::IncompleteRoute.into())
}
pub fn recipient(&self) -> Address {
self.inner
.back()
.cloned()
.expect("Route::recipient failed on invalid Route!")
}
}
impl Display for Route {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{}",
self.inner
.iter()
.map(|a| format!("{}", a))
.collect::<Vec<_>>()
.join(" => ")
)
}
}
impl From<RouteBuilder<'_>> for Route {
fn from(RouteBuilder { ref inner, .. }: RouteBuilder) -> Self {
Self {
inner: inner.clone(),
}
}
}
impl From<Address> for Route {
fn from(address: Address) -> Self {
let addr: Address = address;
Route::new().append(addr).into()
}
}
impl From<&str> for Route {
fn from(s: &str) -> Self {
Address::from(s).into()
}
}
impl<T: Into<Address>> From<Vec<T>> for Route {
fn from(vt: Vec<T>) -> Self {
let mut route = Route::new();
for t in vt {
route = route.append(t.into());
}
route.into()
}
}
pub struct RouteBuilder<'r> {
inner: VecDeque<Address>,
write_back: Option<&'r mut Route>,
}
impl RouteBuilder<'_> {
fn new() -> Self {
Self {
inner: VecDeque::new(),
write_back: None,
}
}
pub fn append<A: Into<Address>>(mut self, addr: A) -> Self {
self.inner.push_back(addr.into());
self
}
pub fn append_t<A: Into<String>>(mut self, t: u8, addr: A) -> Self {
self.inner
.push_back(format!("{}#{}", t, addr.into()).into());
self
}
pub fn prepend<A: Into<Address>>(mut self, addr: A) -> Self {
self.inner.push_front(addr.into());
self
}
pub fn replace<A: Into<Address>>(mut self, addr: A) -> Self {
self.inner.pop_front();
self.inner.push_front(addr.into());
self
}
pub fn pop_front(mut self) -> Self {
self.inner.pop_front();
self
}
pub fn pop_back(mut self) -> Self {
self.inner.pop_back();
self
}
}
impl Drop for RouteBuilder<'_> {
fn drop(&mut self) {
if self.write_back.is_some() {
**self.write_back.as_mut().unwrap() = Route {
inner: self.inner.clone(),
};
}
}
}
#[cfg(test)]
mod tests {
use crate::{Address, Error, Route, RouteError};
fn validate_error(err: Error) {
assert_eq!(err.domain(), RouteError::DOMAIN_NAME);
assert_eq!(err.code(), RouteError::DOMAIN_CODE);
}
#[test]
fn test_route_from_vec() {
let address = Address::from_string("a");
let mut route: Route = vec![address, "b".into()].into();
assert_eq!(route.next().unwrap(), &Address::from_string("0#a"));
assert_eq!(route.next().unwrap(), &Address::from_string("0#a"));
assert_eq!(route.recipient(), Address::from_string("0#b"));
assert_eq!(route.step().unwrap(), Address::from_string("0#a"));
assert_eq!(route.step().unwrap(), Address::from_string("0#b"));
}
#[test]
fn test_route_create() {
let addresses = vec!["node-1", "node-2"];
let route: Route = Route::create(addresses);
assert_eq!(route.recipient(), Address::from_string("0#node-2"));
}
#[test]
fn test_route_parse_empty_string() {
assert_eq!(Route::parse(""), None);
}
#[test]
fn test_route_parse_valid_input() {
let s = " node-1 =>node-2=> node-3 ";
let mut route = Route::parse(s).unwrap();
assert_eq!(route.next().unwrap(), &Address::from_string("0#node-1"));
assert_eq!(route.recipient(), Address::from_string("0#node-3"));
let _ = route.step();
assert_eq!(route.next().unwrap(), &Address::from_string("0#node-2"));
}
#[test]
fn test_route_accessors_error_condition() {
let s = "node-1";
let mut route = Route::parse(s).unwrap();
let _ = route.step();
validate_error(route.step().err().unwrap());
validate_error(route.next().err().unwrap());
}
#[test]
#[should_panic(expected = "Route::recipient failed on invalid Route!")]
fn test_route_no_recipient() {
let mut route = Route::parse("node-1=>node-2").unwrap();
let _ = route.step();
let _ = route.step();
route.recipient();
}
}