From 49a076d79f050619a980de8409a17407fa597634 Mon Sep 17 00:00:00 2001 From: Sarem Seitz Date: Thu, 11 Dec 2025 06:18:09 +0100 Subject: [PATCH 1/3] start limiter server --- crates/cache/src/lib.rs | 2 +- crates/limiter/.gitignore | 1 + crates/limiter/Cargo.lock | 456 +++++++++++++++++++++++++++++++++++ crates/limiter/Cargo.toml | 13 + crates/limiter/src/lib.rs | 25 ++ crates/limiter/src/logger.rs | 27 +++ 6 files changed, 523 insertions(+), 1 deletion(-) create mode 100644 crates/limiter/.gitignore create mode 100644 crates/limiter/Cargo.lock create mode 100644 crates/limiter/Cargo.toml create mode 100644 crates/limiter/src/lib.rs create mode 100644 crates/limiter/src/logger.rs diff --git a/crates/cache/src/lib.rs b/crates/cache/src/lib.rs index 39084f2..a8fcb3c 100644 --- a/crates/cache/src/lib.rs +++ b/crates/cache/src/lib.rs @@ -4,7 +4,7 @@ use std::time::SystemTime; use dashmap::DashMap; -mod storage; +pub mod storage; use storage::{CacheStorage, InMemoryStorage, SimpleFileStorage}; #[derive(Debug)] diff --git a/crates/limiter/.gitignore b/crates/limiter/.gitignore new file mode 100644 index 0000000..eb5a316 --- /dev/null +++ b/crates/limiter/.gitignore @@ -0,0 +1 @@ +target diff --git a/crates/limiter/Cargo.lock b/crates/limiter/Cargo.lock new file mode 100644 index 0000000..e6d7e90 --- /dev/null +++ b/crates/limiter/Cargo.lock @@ -0,0 +1,456 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 4 + +[[package]] +name = "async-trait" +version = "0.1.89" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb" +dependencies = [ + "proc-macro2", + "quote", + "syn", +] + +[[package]] +name = "bitflags" +version = "2.10.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "812e12b5285cc515a9c72a5c1d3b6d46a19dac5acfef5265968c166106e31dd3" + +[[package]] +name = "bumpalo" +version = 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0000000..5397b67 --- /dev/null +++ b/crates/limiter/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "limiter" +version = "0.1.0" +edition = "2024" + +[lints.rust] +dead_code = "allow" +unused_imports = "allow" + +[dependencies] +async-trait = "0.1.89" +cache = { path = "../cache" } +throttle = { path = "../throttle" } diff --git a/crates/limiter/src/lib.rs b/crates/limiter/src/lib.rs new file mode 100644 index 0000000..85046c6 --- /dev/null +++ b/crates/limiter/src/lib.rs @@ -0,0 +1,25 @@ +use async_trait::async_trait; + +use cache::Cache; +use cache::storage::{CacheStorage, InMemoryStorage, SimpleFileStorage}; +use throttle::{InMemoryThrottler, Throttle}; + +pub mod logger; + +use logger::{Logger, SimpleLogger}; + +#[async_trait] +pub trait Limiter { + async fn run(&self) {} +} + +pub struct Server { + logger: T, +} + +#[async_trait] +impl Limiter for Server { + async fn run(&self) { + self.logger.log("Server is running").await; + } +} diff --git a/crates/limiter/src/logger.rs b/crates/limiter/src/logger.rs new file mode 100644 index 0000000..7b983e9 --- /dev/null +++ b/crates/limiter/src/logger.rs @@ -0,0 +1,27 @@ +use async_trait::async_trait; + +#[async_trait] +pub trait Logger { + async fn log(&self, message: &str); +} + +pub struct SimpleLogger; + +impl SimpleLogger { + pub fn new() -> Self { + SimpleLogger {} + } +} + +impl Default for SimpleLogger { + fn default() -> Self { + Self::new() + } +} + +#[async_trait] +impl Logger for SimpleLogger { + async fn log(&self, message: &str) { + println!("[LOG]: {}", message); + } +} From 46c95e64cf6439601d703f6b69a9f5542759dcc5 Mon Sep 17 00:00:00 2001 From: Sarem Seitz Date: Fri, 12 Dec 2025 15:30:20 +0100 Subject: [PATCH 2/3] update --- crates/limiter/Cargo.lock | 33 +++++++++++++ crates/limiter/Cargo.toml | 5 ++ crates/limiter/src/lib.rs | 95 ++++++++++++++++++++++++++++++++---- crates/limiter/src/logger.rs | 27 ---------- 4 files changed, 124 insertions(+), 36 deletions(-) delete mode 100644 crates/limiter/src/logger.rs diff --git a/crates/limiter/Cargo.lock b/crates/limiter/Cargo.lock index e6d7e90..b028a23 100644 --- a/crates/limiter/Cargo.lock +++ b/crates/limiter/Cargo.lock @@ -108,6 +108,8 @@ dependencies = [ "async-trait", "cache", "throttle", + "tokio", + "tracing", ] [[package]] @@ -283,6 +285,37 @@ dependencies = [ "syn", ] +[[package]] +name = "tracing" +version = "0.1.43" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2d15d90a0b5c19378952d479dc858407149d7bb45a14de0142f6c534b16fc647" +dependencies = [ + "pin-project-lite", + "tracing-attributes", + "tracing-core", +] + +[[package]] +name = "tracing-attributes" +version = "0.1.31" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7490cfa5ec963746568740651ac6781f701c9c5ea257c58e057f3ba8cf69e8da" +dependencies = [ + "proc-macro2", + "quote", + "syn", +] + +[[package]] +name = "tracing-core" +version = "0.1.35" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7a04e24fab5c89c6a36eb8558c9656f30d81de51dfa4d3b45f26b21d61fa0a6c" +dependencies = [ + "once_cell", +] + [[package]] name = "unicode-ident" version = "1.0.22" diff --git a/crates/limiter/Cargo.toml b/crates/limiter/Cargo.toml index 5397b67..4aead2f 100644 --- a/crates/limiter/Cargo.toml +++ b/crates/limiter/Cargo.toml @@ -7,7 +7,12 @@ edition = "2024" dead_code = "allow" unused_imports = "allow" +[lints.clippy] +trim_split_whitespace = "allow" + [dependencies] async-trait = "0.1.89" cache = { path = "../cache" } throttle = { path = "../throttle" } +tokio = { version = "1.48.0", features = ["full"] } +tracing = "0.1.43" diff --git a/crates/limiter/src/lib.rs b/crates/limiter/src/lib.rs index 85046c6..894a477 100644 --- a/crates/limiter/src/lib.rs +++ b/crates/limiter/src/lib.rs @@ -1,25 +1,102 @@ +use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader}; +use tokio::net::{TcpListener, TcpStream}; +use tokio::time::Instant; use async_trait::async_trait; +use tracing::info; use cache::Cache; use cache::storage::{CacheStorage, InMemoryStorage, SimpleFileStorage}; use throttle::{InMemoryThrottler, Throttle}; -pub mod logger; - -use logger::{Logger, SimpleLogger}; - #[async_trait] -pub trait Limiter { +pub trait Limiter { async fn run(&self) {} } -pub struct Server { - logger: T, +pub struct Server +where + T: CacheStorage + Send + Sync, + U: Throttle + Send + Sync, +{ + ip: String, + port: u16, + cache: Cache, + throttler: U, +} + +impl Server { + pub fn new_in_memory( + ip: &str, + port: u16, + cache_size: &usize, + cache_ttl_seconds: &u64, + throttle_duration_ms: u64, + ) -> Self { + Server { + ip: ip.to_string(), + port, + cache: Cache::new(cache_size, cache_ttl_seconds), + throttler: InMemoryThrottler::new(throttle_duration_ms), + } + } +} + +impl Server { + async fn handle_connection(&self, client_stream: TcpStream) -> Result<(), Box> { + let mut client_stream_reader = BufReader::new(client_stream); + + let mut first_line = String::new(); + + if client_stream_reader.read_line(&mut first_line).await? == 0 { + return Err("Client closed connection prematurely".into()); + } + + let parts: Vec<&str> = first_line.trim().split_whitespace().collect(); + if parts.len() < 3 { + return Err("Invalid HTTP request line".into()); + } + + let method = parts[0]; + let host = parts[1]; + + match method { + "CONNECT" => { + info!("Handling CONNECT request to: {}", host); + return self.handle_connect_method(host, client_stream_reader).await; + } + _ => { + Err(format!("Unsupported HTTP method: {}", method).into()) + } + } + } + + async fn handle_connect_method(&self, host: &str, mut client_stream_reader: BufReader) -> Result<(), Box> { + self.throttler.throttle(host).await; + + loop { + let mut line = String::new(); + if client_stream_reader.read_line(&mut line).await? == 0 { break; } + if line.trim().is_empty() { break; } + } + + let mut target_stream = TcpStream::connect(host).await?; + + let response = "HTTP/1.1 200 Connection Established\r\n\r\n"; + client_stream_reader + .get_mut() + .write_all(response.as_bytes()) + .await?; + + let mut client_stream = client_stream_reader.into_inner(); + tokio::io::copy_bidirectional(&mut client_stream, &mut target_stream).await?; + + Ok(()) + } } #[async_trait] -impl Limiter for Server { +impl Limiter for Server { async fn run(&self) { - self.logger.log("Server is running").await; + info!("Starting the server..."); } } diff --git a/crates/limiter/src/logger.rs b/crates/limiter/src/logger.rs deleted file mode 100644 index 7b983e9..0000000 --- a/crates/limiter/src/logger.rs +++ /dev/null @@ -1,27 +0,0 @@ -use async_trait::async_trait; - -#[async_trait] -pub trait Logger { - async fn log(&self, message: &str); -} - -pub struct SimpleLogger; - -impl SimpleLogger { - pub fn new() -> Self { - SimpleLogger {} - } -} - -impl Default for SimpleLogger { - fn default() -> Self { - Self::new() - } -} - -#[async_trait] -impl Logger for SimpleLogger { - async fn log(&self, message: &str) { - println!("[LOG]: {}", message); - } -} From ef7e0b788a536e195d68da4fc2f3ead026bf5f86 Mon Sep 17 00:00:00 2001 From: Sarem Seitz Date: Fri, 12 Dec 2025 18:33:52 +0100 Subject: [PATCH 3/3] add server --- crates/limiter/Cargo.lock | 1635 +++++++++++++++++++++++++++++++++++-- crates/limiter/Cargo.toml | 4 + crates/limiter/src/lib.rs | 303 ++++++- 3 files changed, 1826 insertions(+), 116 deletions(-) diff --git a/crates/limiter/Cargo.lock b/crates/limiter/Cargo.lock index b028a23..d87b203 100644 --- a/crates/limiter/Cargo.lock +++ b/crates/limiter/Cargo.lock @@ -13,12 +13,33 @@ dependencies = [ "syn", ] +[[package]] +name = "atomic-waker" +version = "1.1.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0" + +[[package]] +name = "base64" +version = "0.22.1" +source = 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+use async_trait::async_trait; +use sha2::{Digest, Sha256}; +use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader}; use tokio::net::{TcpListener, TcpStream}; use tokio::time::Instant; -use async_trait::async_trait; use tracing::info; +use url::Url; use cache::Cache; use cache::storage::{CacheStorage, InMemoryStorage, SimpleFileStorage}; @@ -10,7 +14,7 @@ use throttle::{InMemoryThrottler, Throttle}; #[async_trait] pub trait Limiter { - async fn run(&self) {} + async fn run(self: Arc) {} } pub struct Server @@ -31,22 +35,24 @@ impl Server { cache_size: &usize, cache_ttl_seconds: &u64, throttle_duration_ms: u64, - ) -> Self { - Server { + ) -> Arc { + Arc::new(Server { ip: ip.to_string(), port, cache: Cache::new(cache_size, cache_ttl_seconds), throttler: InMemoryThrottler::new(throttle_duration_ms), - } + }) } } -impl Server { - async fn handle_connection(&self, client_stream: TcpStream) -> Result<(), Box> { +impl Server { + async fn handle_connection( + &self, + client_stream: TcpStream, + ) -> Result<(), Box> { let mut client_stream_reader = BufReader::new(client_stream); let mut first_line = String::new(); - if client_stream_reader.read_line(&mut first_line).await? == 0 { return Err("Client closed connection prematurely".into()); } @@ -56,47 +62,290 @@ impl Server { return Err("Invalid HTTP request line".into()); } - let method = parts[0]; - let host = parts[1]; + let method = parts[0].to_string(); + let host_or_url = parts[1].to_string(); + let version = parts[2].to_string(); - match method { + match method.as_str() { "CONNECT" => { - info!("Handling CONNECT request to: {}", host); - return self.handle_connect_method(host, client_stream_reader).await; + self.handle_connect_method(&host_or_url, client_stream_reader, first_line) + .await } _ => { - Err(format!("Unsupported HTTP method: {}", method).into()) + self.handle_else_methods( + &method, + &host_or_url, + &version, + client_stream_reader, + first_line, + ) + .await } } } - async fn handle_connect_method(&self, host: &str, mut client_stream_reader: BufReader) -> Result<(), Box> { - self.throttler.throttle(host).await; - + async fn handle_connect_method( + &self, + host: &str, + mut client_stream_reader: BufReader, + first_line: String, + ) -> Result<(), Box> { + let mut request_buffer = first_line.clone(); loop { let mut line = String::new(); - if client_stream_reader.read_line(&mut line).await? == 0 { break; } - if line.trim().is_empty() { break; } + if client_stream_reader.read_line(&mut line).await? == 0 { + break; + } + request_buffer.push_str(&line); + if line.trim().is_empty() { + break; + } + } + + let mut hasher = Sha256::new(); + let cache_key_str = format!("{}{}", host, request_buffer); + hasher.update(cache_key_str.as_bytes()); + let cache_key = hex::encode(hasher.finalize()); + + if let Some(cached_response) = self.cache.get(&cache_key).await { + info!("Cache HIT for key: {}", cache_key); + + let stream = client_stream_reader.get_mut(); + stream.write_all(&cached_response).await?; + stream.flush().await?; + stream.shutdown().await?; + + return Ok(()); } - let mut target_stream = TcpStream::connect(host).await?; + self.throttler.throttle(host).await; + + let target_stream = TcpStream::connect(host).await?; + let (mut target_read, mut target_write) = tokio::io::split(target_stream); - let response = "HTTP/1.1 200 Connection Established\r\n\r\n"; + let connection_established = "HTTP/1.1 200 Connection Established\r\n\r\n"; client_stream_reader .get_mut() - .write_all(response.as_bytes()) + .write_all(connection_established.as_bytes()) .await?; - let mut client_stream = client_stream_reader.into_inner(); - tokio::io::copy_bidirectional(&mut client_stream, &mut target_stream).await?; + let (mut client_read, mut client_write) = tokio::io::split(client_stream_reader); + + let upstream_task = + tokio::spawn(async move { tokio::io::copy(&mut client_read, &mut target_write).await }); + + let mut cache_buffer = Vec::new(); + let mut buffer = [0u8; 8192]; + loop { + let n = target_read.read(&mut buffer).await?; + if n == 0 { + break; + } + client_write.write_all(&buffer[..n]).await?; + cache_buffer.extend_from_slice(&buffer[..n]); + } + + let _ = upstream_task.await; + + self.cache.put(&cache_key, &cache_buffer).await.ok(); + Ok(()) + } + + async fn handle_else_methods( + &self, + method: &str, + url_str: &str, + version: &str, + mut client_stream_reader: BufReader, + first_line: String, + ) -> Result<(), Box> { + let url = Url::parse(url_str)?; + let target_host = url.host_str().ok_or("Invalid host")?; + let target_port = url.port_or_known_default().unwrap_or(80); + let target_addr = format!("{}:{}", target_host, target_port); + + let mut headers_lines: Vec = Vec::new(); + let mut full_request_str = first_line.clone(); + + loop { + let mut line = String::new(); + if client_stream_reader.read_line(&mut line).await? == 0 { + break; + } + + full_request_str.push_str(&line); + headers_lines.push(line.clone()); + + if line.trim().is_empty() { + break; + } + } + + let mut hasher = Sha256::new(); + let cache_key_str = format!("{}{}", target_addr, full_request_str); + hasher.update(cache_key_str.as_bytes()); + let cache_key = hex::encode(hasher.finalize()); + + if let Some(cached_response) = self.cache.get(&cache_key).await { + info!("Cache HIT for key: {}", cache_key); + + let stream = client_stream_reader.get_mut(); + stream.write_all(&cached_response).await?; + stream.flush().await?; + stream.shutdown().await?; + + return Ok(()); + } + + self.throttler.throttle(&target_addr).await; + + let mut target_stream = TcpStream::connect(&target_addr).await?; + + let path = url.path(); + let path_and_query = match url.query() { + Some(q) => format!("{}?{}", path, q), + None => path.to_string(), + }; + + let new_request_line = format!("{} {} {}\r\n", method, path_and_query, version); + target_stream.write_all(new_request_line.as_bytes()).await?; + + for line in headers_lines { + if !line.to_lowercase().starts_with("proxy-") { + target_stream.write_all(line.as_bytes()).await?; + } + } + + let (mut target_read, mut target_write) = tokio::io::split(target_stream); + let (mut client_read, mut client_write) = tokio::io::split(client_stream_reader); + + let upstream_task = + tokio::spawn(async move { tokio::io::copy(&mut client_read, &mut target_write).await }); + + let mut cache_buffer = Vec::new(); + let mut buffer = [0u8; 8192]; + loop { + let n = target_read.read(&mut buffer).await?; + if n == 0 { + break; + } + + client_write.write_all(&buffer[..n]).await?; + cache_buffer.extend_from_slice(&buffer[..n]); + } + + let _ = upstream_task.await; + self.cache.put(&cache_key, &cache_buffer).await.ok(); Ok(()) } } #[async_trait] -impl Limiter for Server { - async fn run(&self) { +impl Limiter + for Server +{ + async fn run(self: Arc) { info!("Starting the server..."); + let listener = TcpListener::bind(format!("{}:{}", self.ip, self.port)) + .await + .expect("Failed to bind to address"); + + loop { + let (client_stream, addr) = listener + .accept() + .await + .expect("Failed to accept connection"); + + let server_clone = self.clone(); + + tokio::spawn(async move { + if let Err(e) = server_clone.handle_connection(client_stream).await { + eprintln!("Error handling connection from {}: {}", addr, e); + } + }); + } + } +} + +#[cfg(test)] +mod tests { + use super::*; + use std::sync::atomic::{AtomicUsize, Ordering}; + use tokio::io::{AsyncReadExt, AsyncWriteExt}; + use tokio::net::TcpListener; + + #[tokio::test] + async fn test_proxy_server_caches_requests() { + let upstream_listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let upstream_addr = upstream_listener.local_addr().unwrap(); + + let hit_counter = Arc::new(AtomicUsize::new(0)); + let hit_counter_clone = hit_counter.clone(); + + tokio::spawn(async move { + loop { + if let Ok((mut socket, _)) = upstream_listener.accept().await { + let counter = hit_counter_clone.clone(); + tokio::spawn(async move { + counter.fetch_add(1, Ordering::SeqCst); + + let mut buf = [0u8; 1024]; + let _ = socket.read(&mut buf).await; + + let response = "HTTP/1.1 200 OK\r\nContent-Length: 12\r\nConnection: close\r\n\r\nHello World!"; + socket.write_all(response.as_bytes()).await.unwrap(); + socket.flush().await.unwrap(); + }); + } + } + }); + + let proxy_port = 9595; + let server = Server::new_in_memory("127.0.0.1", proxy_port, &1024, &60, 10); + + let server_handle = tokio::spawn(async move { + server.run().await; + }); + + tokio::time::sleep(tokio::time::Duration::from_millis(100)).await; + + let proxy_url = format!("http://127.0.0.1:{}", proxy_port); + let client = reqwest::Client::builder() + .proxy(reqwest::Proxy::http(&proxy_url).unwrap()) + .build() + .unwrap(); + + let target_url = format!("http://{}/resource", upstream_addr); + + let res1 = client + .get(&target_url) + .send() + .await + .expect("Request 1 failed"); + let body1 = res1.text().await.expect("Failed to read body 1"); + + assert_eq!(body1, "Hello World!"); + assert_eq!( + hit_counter.load(Ordering::SeqCst), + 1, + "Upstream should be hit once" + ); + + let res2 = client + .get(&target_url) + .send() + .await + .expect("Request 2 failed"); + let body2 = res2.text().await.expect("Failed to read body 2"); + + assert_eq!(body2, "Hello World!"); + assert_eq!( + hit_counter.load(Ordering::SeqCst), + 1, + "Upstream should NOT be hit again (Cache Hit)" + ); + + server_handle.abort(); } }