relay/src/requests.rs

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use crate::error::MyError;
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use activitystreams::url::Url;
use actix_web::{client::Client, http::header::Date, web::Bytes};
use async_mutex::Mutex;
use async_rwlock::RwLock;
use chrono::{DateTime, Utc};
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use http_signature_normalization_actix::prelude::*;
use log::{debug, info, warn};
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use rsa::{hash::Hash, padding::PaddingScheme, RSAPrivateKey};
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use sha2::{Digest, Sha256};
use std::{
cell::RefCell,
collections::HashMap,
rc::Rc,
sync::{
atomic::{AtomicUsize, Ordering},
Arc,
},
time::SystemTime,
};
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#[derive(Clone)]
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pub(crate) struct Breakers {
inner: Arc<RwLock<HashMap<String, Arc<Mutex<Breaker>>>>>,
}
impl Breakers {
async fn should_try(&self, url: &Url) -> bool {
if let Some(domain) = url.domain() {
if let Some(breaker) = self.inner.read().await.get(domain) {
breaker.lock().await.should_try()
} else {
true
}
} else {
false
}
}
async fn fail(&self, url: &Url) {
if let Some(domain) = url.domain() {
let should_write = {
let read = self.inner.read().await;
if let Some(breaker) = read.get(domain) {
let owned_breaker = Arc::clone(&breaker);
drop(breaker);
owned_breaker.lock().await.fail();
false
} else {
true
}
};
if should_write {
let mut hm = self.inner.write().await;
let breaker = hm
.entry(domain.to_owned())
.or_insert(Arc::new(Mutex::new(Breaker::default())));
breaker.lock().await.fail();
}
}
}
async fn succeed(&self, url: &Url) {
if let Some(domain) = url.domain() {
let should_write = {
let read = self.inner.read().await;
if let Some(breaker) = read.get(domain) {
let owned_breaker = Arc::clone(&breaker);
drop(breaker);
owned_breaker.lock().await.succeed();
false
} else {
true
}
};
if should_write {
let mut hm = self.inner.write().await;
let breaker = hm
.entry(domain.to_owned())
.or_insert(Arc::new(Mutex::new(Breaker::default())));
breaker.lock().await.succeed();
}
}
}
}
impl Default for Breakers {
fn default() -> Self {
Breakers {
inner: Arc::new(RwLock::new(HashMap::new())),
}
}
}
struct Breaker {
failures: usize,
last_attempt: DateTime<Utc>,
last_success: DateTime<Utc>,
}
impl Breaker {
const fn failure_threshold() -> usize {
10
}
fn failure_wait() -> chrono::Duration {
chrono::Duration::days(1)
}
fn should_try(&self) -> bool {
self.failures < Self::failure_threshold()
|| self.last_attempt + Self::failure_wait() < Utc::now()
}
fn fail(&mut self) {
self.failures += 1;
self.last_attempt = Utc::now();
}
fn succeed(&mut self) {
self.failures = 0;
self.last_attempt = Utc::now();
self.last_success = Utc::now();
}
}
impl Default for Breaker {
fn default() -> Self {
let now = Utc::now();
Breaker {
failures: 0,
last_attempt: now,
last_success: now,
}
}
}
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#[derive(Clone)]
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pub(crate) struct Requests {
client: Rc<RefCell<Client>>,
consecutive_errors: Rc<AtomicUsize>,
error_limit: usize,
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key_id: String,
user_agent: String,
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private_key: RSAPrivateKey,
config: Config,
breakers: Breakers,
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}
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impl Requests {
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pub(crate) fn new(
key_id: String,
private_key: RSAPrivateKey,
user_agent: String,
breakers: Breakers,
) -> Self {
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Requests {
client: Rc::new(RefCell::new(
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Client::builder()
.header("User-Agent", user_agent.clone())
.finish(),
)),
consecutive_errors: Rc::new(AtomicUsize::new(0)),
error_limit: 3,
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key_id,
user_agent,
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private_key,
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config: Config::default().mastodon_compat(),
breakers,
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}
}
fn count_err(&self) {
let count = self.consecutive_errors.fetch_add(1, Ordering::Relaxed);
if count + 1 >= self.error_limit {
warn!("{} consecutive errors, rebuilding http client", count);
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*self.client.borrow_mut() = Client::builder()
.header("User-Agent", self.user_agent.clone())
.finish();
self.reset_err();
}
}
fn reset_err(&self) {
self.consecutive_errors.swap(0, Ordering::Relaxed);
}
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pub(crate) async fn fetch_json<T>(&self, url: &str) -> Result<T, MyError>
where
T: serde::de::DeserializeOwned,
{
self.do_fetch(url, "application/json").await
}
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pub(crate) async fn fetch<T>(&self, url: &str) -> Result<T, MyError>
where
T: serde::de::DeserializeOwned,
{
self.do_fetch(url, "application/activity+json").await
}
async fn do_fetch<T>(&self, url: &str, accept: &str) -> Result<T, MyError>
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where
T: serde::de::DeserializeOwned,
{
let parsed_url = url.parse::<Url>()?;
if !self.breakers.should_try(&parsed_url).await {
return Err(MyError::Breaker);
}
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let signer = self.signer();
let client: Client = self.client.borrow().clone();
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let res = client
.get(url)
.header("Accept", accept)
.set(Date(SystemTime::now().into()))
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.signature(
self.config.clone(),
self.key_id.clone(),
move |signing_string| signer.sign(signing_string),
)
.await?
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.send()
.await;
if res.is_err() {
self.count_err();
self.breakers.fail(&parsed_url).await;
}
let mut res = res.map_err(|e| MyError::SendRequest(url.to_string(), e.to_string()))?;
self.reset_err();
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if !res.status().is_success() {
if let Ok(bytes) = res.body().await {
if let Ok(s) = String::from_utf8(bytes.as_ref().to_vec()) {
if !s.is_empty() {
debug!("Response from {}, {}", url, s);
}
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}
}
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self.breakers.fail(&parsed_url).await;
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return Err(MyError::Status(url.to_string(), res.status()));
}
self.breakers.succeed(&parsed_url).await;
let body = res
.body()
.await
.map_err(|e| MyError::ReceiveResponse(url.to_string(), e.to_string()))?;
Ok(serde_json::from_slice(body.as_ref())?)
}
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pub(crate) async fn fetch_bytes(&self, url: &str) -> Result<(String, Bytes), MyError> {
let parsed_url = url.parse::<Url>()?;
if !self.breakers.should_try(&parsed_url).await {
return Err(MyError::Breaker);
}
info!("Fetching bytes for {}", url);
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let signer = self.signer();
let client: Client = self.client.borrow().clone();
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let res = client
.get(url)
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.header("Accept", "*/*")
.set(Date(SystemTime::now().into()))
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.signature(
self.config.clone(),
self.key_id.clone(),
move |signing_string| signer.sign(signing_string),
)
.await?
.send()
.await;
if res.is_err() {
self.breakers.fail(&parsed_url).await;
self.count_err();
}
let mut res = res.map_err(|e| MyError::SendRequest(url.to_string(), e.to_string()))?;
self.reset_err();
let content_type = if let Some(content_type) = res.headers().get("content-type") {
if let Ok(s) = content_type.to_str() {
s.to_owned()
} else {
return Err(MyError::ContentType);
}
} else {
return Err(MyError::ContentType);
};
if !res.status().is_success() {
if let Ok(bytes) = res.body().await {
if let Ok(s) = String::from_utf8(bytes.as_ref().to_vec()) {
if !s.is_empty() {
debug!("Response from {}, {}", url, s);
}
}
}
self.breakers.fail(&parsed_url).await;
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return Err(MyError::Status(url.to_string(), res.status()));
}
self.breakers.succeed(&parsed_url).await;
let bytes = match res.body().limit(1024 * 1024 * 4).await {
Err(e) => {
return Err(MyError::ReceiveResponse(url.to_string(), e.to_string()));
}
Ok(bytes) => bytes,
};
Ok((content_type, bytes))
}
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pub(crate) async fn deliver<T>(&self, inbox: Url, item: &T) -> Result<(), MyError>
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where
T: serde::ser::Serialize,
{
if !self.breakers.should_try(&inbox).await {
return Err(MyError::Breaker);
}
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let signer = self.signer();
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let item_string = serde_json::to_string(item)?;
let client: Client = self.client.borrow().clone();
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let res = client
.post(inbox.as_str())
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.header("Accept", "application/activity+json")
.header("Content-Type", "application/activity+json")
.set(Date(SystemTime::now().into()))
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.signature_with_digest(
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self.config.clone(),
self.key_id.clone(),
Sha256::new(),
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item_string,
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move |signing_string| signer.sign(signing_string),
)
.await?
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.send()
.await;
if res.is_err() {
self.count_err();
self.breakers.fail(&inbox).await;
}
let mut res = res.map_err(|e| MyError::SendRequest(inbox.to_string(), e.to_string()))?;
self.reset_err();
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if !res.status().is_success() {
if let Ok(bytes) = res.body().await {
if let Ok(s) = String::from_utf8(bytes.as_ref().to_vec()) {
if !s.is_empty() {
debug!("Response from {}, {}", inbox.as_str(), s);
}
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}
}
self.breakers.fail(&inbox).await;
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return Err(MyError::Status(inbox.to_string(), res.status()));
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}
self.breakers.succeed(&inbox).await;
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Ok(())
}
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fn signer(&self) -> Signer {
Signer {
private_key: self.private_key.clone(),
}
}
}
struct Signer {
private_key: RSAPrivateKey,
}
impl Signer {
fn sign(&self, signing_string: &str) -> Result<String, MyError> {
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let hashed = Sha256::digest(signing_string.as_bytes());
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let bytes = self.private_key.sign(
PaddingScheme::PKCS1v15Sign {
hash: Some(Hash::SHA2_256),
},
&hashed,
)?;
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Ok(base64::encode(bytes))
}
}