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|
use std::{
io,
net::{IpAddr, SocketAddr},
path::Path,
sync::{Arc, Mutex},
};
use tokio::{
fs,
io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
};
const FALLBACK_API_ADDRESS: (IpAddr, u16) = (crate::API_IP, 443);
#[derive(Clone)]
pub struct AddressCache {
inner: Arc<Mutex<AddressCacheInner>>,
cache_path: Option<Arc<Path>>,
}
impl AddressCache {
pub fn new() -> Self {
Self {
inner: Arc::new(Mutex::new(Default::default())),
cache_path: None,
}
}
pub async fn with_cache(cache_path: Box<Path>) -> Self {
let cache = AddressCacheInner::from_cache_file(&cache_path)
.await
.unwrap_or_default();
let inner = Arc::new(Mutex::new(cache));
let cache_path = Some(cache_path.into());
Self { inner, cache_path }
}
pub fn get_address(&self) -> SocketAddr {
let mut inner = self.inner.lock().unwrap();
inner.last_try = Some(inner.choice);
Self::get_address_inner(&inner)
}
fn get_address_inner(inner: &AddressCacheInner) -> SocketAddr {
if inner.addresses.is_empty() {
return FALLBACK_API_ADDRESS.into();
}
*inner
.addresses
.get(inner.choice % inner.addresses.len())
.unwrap_or(&FALLBACK_API_ADDRESS.into())
}
pub fn register_failure(&self, failed_addr: SocketAddr, err: &dyn std::error::Error) {
let mut inner = self.inner.lock().unwrap();
let current_address = Self::get_address_inner(&inner);
// Only choose the next server if the current one has been tried before and it failed
if failed_addr == current_address
&& inner
.last_try
.map(|last_try| last_try == inner.choice)
.unwrap_or(false)
{
log::error!("HTTP request failed: {}, will try next API address", err);
inner.choice = inner.choice.wrapping_add(1);
}
}
pub async fn set_addresses(&self, addresses: Vec<SocketAddr>) -> io::Result<()> {
let should_update = {
let mut inner = self.inner.lock().unwrap();
if addresses != inner.addresses {
inner.addresses = addresses.clone();
inner.choice = 0;
true
} else {
false
}
};
if should_update {
self.save_to_disk(addresses).await?;
}
Ok(())
}
async fn save_to_disk(&self, addresses: Vec<SocketAddr>) -> io::Result<()> {
if let Some(cache_path) = self.cache_path.as_ref() {
let mut file = fs::File::create(cache_path).await?;
let mut contents = addresses
.iter()
.map(ToString::to_string)
.collect::<Vec<String>>()
.join("\n");
contents += "\n";
file.write_all(contents.as_bytes()).await?;
file.sync_data().await?;
}
Ok(())
}
}
impl crate::rest::AddressProvider for AddressCache {
fn get_address(&self) -> String {
self.get_address().to_string()
}
fn clone_box(&self) -> Box<dyn crate::rest::AddressProvider> {
Box::new(self.clone())
}
}
struct AddressCacheInner {
addresses: Vec<SocketAddr>,
choice: usize,
last_try: Option<usize>,
}
impl AddressCacheInner {
async fn from_cache_file(path: &Path) -> io::Result<Self> {
let file = fs::File::open(path).await?;
let mut lines = BufReader::new(file).lines();
let mut addresses = vec![];
while let Some(line) = lines.next_line().await? {
// for line in lines.next_line() {
match line.trim().parse() {
Ok(address) => addresses.push(address),
Err(err) => {
log::error!("Failed to parse cached address line: {}", err);
}
}
}
if !addresses.contains(&FALLBACK_API_ADDRESS.into()) {
addresses.push(FALLBACK_API_ADDRESS.into());
}
Ok(Self {
addresses,
..Default::default()
})
}
}
impl Default for AddressCacheInner {
fn default() -> Self {
Self {
addresses: vec![FALLBACK_API_ADDRESS.into()],
choice: 0,
last_try: None,
}
}
}
|
