196 lines
6.2 KiB
Rust
196 lines
6.2 KiB
Rust
use crate::{constants::MAX_CACHE_ENTRY, error::*, globals::Globals, log::*, CryptoSource};
|
|
use base64::{engine::general_purpose, Engine as _};
|
|
use bytes::{Buf, Bytes, BytesMut};
|
|
use http_cache_semantics::CachePolicy;
|
|
use hyper::{
|
|
http::{Request, Response},
|
|
Body,
|
|
};
|
|
use moka::future::Cache as MokaCache;
|
|
use sha2::{Digest, Sha256};
|
|
use std::{fmt::Debug, path::PathBuf, time::SystemTime};
|
|
use tokio::{
|
|
fs::{self, File},
|
|
io::{AsyncReadExt, AsyncWriteExt},
|
|
};
|
|
|
|
// #[async_trait]
|
|
// pub trait CacheTarget {
|
|
// type TargetInput;
|
|
// type TargetOutput;
|
|
// type Error;
|
|
// /// Get target object from somewhere
|
|
// async fn get(&self) -> Self::TargetOutput;
|
|
// /// Write target object into somewhere
|
|
// async fn put(&self, taget: Self::TargetOutput) -> Result<(), Self::Error>;
|
|
// /// Remove target object from somewhere (when evicted self)
|
|
// async fn remove(&self) -> Result<(), Self::Error>;
|
|
// }
|
|
|
|
fn derive_filename_from_uri(uri: &hyper::Uri) -> String {
|
|
let mut hasher = Sha256::new();
|
|
hasher.update(uri.to_string());
|
|
let digest = hasher.finalize();
|
|
general_purpose::URL_SAFE_NO_PAD.encode(digest)
|
|
}
|
|
|
|
fn derive_moka_key_from_uri(uri: &hyper::Uri) -> String {
|
|
uri.to_string()
|
|
}
|
|
|
|
#[derive(Clone, Debug)]
|
|
pub struct CacheObject {
|
|
pub policy: CachePolicy,
|
|
pub target: Option<PathBuf>,
|
|
}
|
|
|
|
#[derive(Clone, Debug)]
|
|
pub struct RpxyCache {
|
|
cache_dir: PathBuf,
|
|
inner: MokaCache<String, CacheObject>, // TODO: keyはstring urlでいいのか疑問。全requestに対してcheckすることになりそう
|
|
runtime_handle: tokio::runtime::Handle,
|
|
}
|
|
|
|
impl RpxyCache {
|
|
/// Generate cache storage
|
|
pub async fn new<T: CryptoSource>(globals: &Globals<T>) -> Option<Self> {
|
|
if !globals.proxy_config.cache_enabled {
|
|
return None;
|
|
}
|
|
let runtime_handle = globals.runtime_handle.clone();
|
|
let runtime_handle_clone = globals.runtime_handle.clone();
|
|
let eviction_listener = move |k, v: CacheObject, cause| {
|
|
debug!("Cache entry is being evicted : {k} {:?}", cause);
|
|
runtime_handle.block_on(async {
|
|
if let Some(filepath) = v.target {
|
|
debug!("Evict file object: {k}");
|
|
if let Err(e) = fs::remove_file(filepath).await {
|
|
warn!("Eviction failed during file object removal: {:?}", e);
|
|
};
|
|
}
|
|
})
|
|
};
|
|
|
|
// Create cache file dir
|
|
// Clean up the file dir before init
|
|
// TODO: Persistent cache is really difficult. maybe SQLite is needed.
|
|
let path = globals.proxy_config.cache_dir.as_ref().unwrap();
|
|
if let Err(e) = fs::remove_dir_all(path).await {
|
|
warn!("Failed to clean up the cache dir: {e}");
|
|
};
|
|
fs::create_dir_all(path).await.unwrap();
|
|
|
|
Some(Self {
|
|
cache_dir: path.clone(),
|
|
inner: MokaCache::builder()
|
|
.max_capacity(MAX_CACHE_ENTRY)
|
|
.eviction_listener_with_queued_delivery_mode(eviction_listener)
|
|
.build(), // TODO: make this configurable, and along with size
|
|
runtime_handle: runtime_handle_clone,
|
|
})
|
|
}
|
|
|
|
/// Get cached response
|
|
pub async fn get<R>(&self, req: &Request<R>) -> Option<Response<Body>> {
|
|
let moka_key = req.uri().to_string();
|
|
|
|
// First check cache chance
|
|
let Some(cached_object) = self.inner.get(&moka_key) else {
|
|
return None;
|
|
};
|
|
|
|
let now = SystemTime::now();
|
|
if let http_cache_semantics::BeforeRequest::Fresh(res_parts) = cached_object.policy.before_request(req, now) {
|
|
let Some(filepath) = cached_object.target else {
|
|
return None;
|
|
};
|
|
|
|
let Ok(mut file) = File::open(&filepath.clone()).await else {
|
|
warn!("Cache file doesn't exist. Remove pointer cache.");
|
|
let my_cache = self.inner.clone();
|
|
self.runtime_handle.spawn(async move {
|
|
my_cache.invalidate(&moka_key).await;
|
|
});
|
|
return None;
|
|
};
|
|
let (body_sender, res_body) = Body::channel();
|
|
self.runtime_handle.spawn(async move {
|
|
let mut sender = body_sender;
|
|
// let mut size = 0usize;
|
|
let mut buf = BytesMut::new();
|
|
loop {
|
|
match file.read_buf(&mut buf).await {
|
|
Ok(0) => break,
|
|
Ok(_) => sender.send_data(buf.copy_to_bytes(buf.remaining())).await?,
|
|
Err(_) => break,
|
|
};
|
|
}
|
|
Ok(()) as Result<()>
|
|
});
|
|
|
|
let res = Response::from_parts(res_parts, res_body);
|
|
debug!("Cache hit: {moka_key}");
|
|
Some(res)
|
|
} else {
|
|
// Evict stale cache entry here
|
|
debug!("Evict stale cache entry and file object: {moka_key}");
|
|
let my_cache = self.inner.clone();
|
|
self.runtime_handle.spawn(async move {
|
|
// eviction listener will be activated during invalidation.
|
|
my_cache.invalidate(&moka_key).await;
|
|
});
|
|
None
|
|
}
|
|
}
|
|
|
|
pub fn is_cacheable<R>(&self, req: Option<&Request<R>>, res: Option<&Response<Body>>) -> Result<Option<CachePolicy>>
|
|
where
|
|
R: Debug,
|
|
{
|
|
// deduce cache policy from req and res
|
|
let (Some(req), Some(res)) = (req, res) else {
|
|
return Err(RpxyError::Cache("Invalid null request and/or response"));
|
|
};
|
|
|
|
let new_policy = CachePolicy::new(req, res);
|
|
if new_policy.is_storable() {
|
|
debug!("Response is cacheable: {:?}\n{:?}", req, res.headers());
|
|
Ok(Some(new_policy))
|
|
} else {
|
|
Ok(None)
|
|
}
|
|
}
|
|
|
|
pub async fn put(&self, uri: &hyper::Uri, body_bytes: &Bytes, policy: CachePolicy) -> Result<()> {
|
|
let my_cache = self.inner.clone();
|
|
let uri = uri.clone();
|
|
let cache_dir = self.cache_dir.clone();
|
|
let mut bytes_clone = body_bytes.clone();
|
|
|
|
self.runtime_handle.spawn(async move {
|
|
let moka_key = derive_moka_key_from_uri(&uri);
|
|
let cache_filename = derive_filename_from_uri(&uri);
|
|
let cache_filepath = cache_dir.join(cache_filename);
|
|
|
|
let _x = my_cache
|
|
.get_with(moka_key, async {
|
|
let mut file = File::create(&cache_filepath).await.unwrap();
|
|
while bytes_clone.has_remaining() {
|
|
if let Err(e) = file.write_buf(&mut bytes_clone).await {
|
|
error!("Failed to write file cache: {e}");
|
|
return CacheObject { policy, target: None };
|
|
};
|
|
}
|
|
CacheObject {
|
|
policy,
|
|
target: Some(cache_filepath),
|
|
}
|
|
})
|
|
.await;
|
|
|
|
debug!("Current cache entries: {}", my_cache.entry_count());
|
|
});
|
|
|
|
Ok(())
|
|
}
|
|
}
|