Adding a rate limiter, and a blank query catcher.

- Fixes #66
- Fixes #67

new_torrents_fetcher/Cargo.lock

@@ -1,5 +1,3 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
 [[package]]
 name = "adler32"
 version = "1.0.3"

server/service/.rustfmt.toml

@@ -0,0 +1 @@
+tab_spaces = 2

server/service/Cargo.toml

@@ -4,11 +4,13 @@ version = "0.1.0"
 authors = ["Dessalines <happydooby@gmail.com>"]
 
 [dependencies]
-actix-web = "*"
+actix-web = "1.0"
+actix-files = "0.1.7"
 serde = "*"
 serde_json = "*"
 serde_derive = "*"
 time = "*"
+failure = "*"
 
 [dependencies.rusqlite]
 version = "0.15.0"

server/service/src/main.rs

@@ -1,3 +1,4 @@
+extern crate actix_files;
 extern crate actix_web;
 extern crate serde;
 extern crate serde_json;
@@ -5,31 +6,55 @@ extern crate serde_json;
 extern crate serde_derive;
 extern crate rusqlite;
 extern crate time;
+#[macro_use]
+extern crate failure;
 
-use actix_web::{fs, fs::NamedFile, http, server, App, HttpRequest, HttpResponse, Query};
+use actix_files as fs;
+use actix_files::NamedFile;
+use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer};
+use failure::Error;
+use std::collections::HashMap;
 use std::env;
 use std::ops::Deref;
+use std::sync::Mutex;
+use std::time::SystemTime;
 
-use rusqlite::{Connection};
+use rusqlite::Connection;
+
+const RATE_LIMIT: i32 = 10;
+const RATE_LIMIT_PER_SECOND: i32 = 60;
+
+pub struct State {
+  rate_limits: Mutex<HashMap<String, RateLimitBucket>>,
+}
+
+#[derive(Debug)]
+pub struct RateLimitBucket {
+  last_checked: SystemTime,
+  allowance: f64,
+}
 
 fn main() {
   println!("Access me at {}", endpoint());
-  server::new(|| {
+
+  let shared_data = web::Data::new(State {
+    rate_limits: Mutex::new(HashMap::new()),
+  });
+
+  HttpServer::new(move || {
     App::new()
-      .route("/service/search", http::Method::GET, search)
-      .resource("/", |r| r.f(index))
-      .handler(
-        "/static",
-        fs::StaticFiles::new(front_end_dir())
+      .route("/", web::get().to(index))
+      .service(fs::Files::new("/static", front_end_dir()))
+      .register_data(shared_data.clone())
+      .route("/service/search", web::get().to(search))
+  })
+  .bind(endpoint())
   .unwrap()
-      )
-      .finish()
-  }).bind(endpoint())
+  .run()
   .unwrap()
-    .run();
 }
 
-fn index(_req: &HttpRequest) -> Result<NamedFile, actix_web::error::Error> {
+fn index() -> Result<NamedFile, actix_web::error::Error> {
   Ok(NamedFile::open(front_end_dir() + "/index.html")?)
 }
 
@@ -44,28 +69,58 @@ fn torrents_db_file() -> String {
 fn endpoint() -> String {
   env::var("TORRENTS_CSV_ENDPOINT").unwrap_or("0.0.0.0:8080".to_string())
 }
+
 #[derive(Deserialize)]
 struct SearchQuery {
   q: String,
   page: Option<usize>,
   size: Option<usize>,
-  type_: Option<String>
+  type_: Option<String>,
 }
 
-fn search(query: Query<SearchQuery>) -> HttpResponse {
-  HttpResponse::Ok()
+fn search(
+  req: HttpRequest,
+  data: web::Data<State>,
+  query: web::Query<SearchQuery>,
+) -> HttpResponse {
+  let ip = req
+    .connection_info()
+    .remote()
+    .unwrap_or("127.0.0.1:12345")
+    .split(":")
+    .next()
+    .unwrap_or("127.0.0.1")
+    .to_string();
+
+  if query.q.is_empty() {
+    return HttpResponse::BadRequest()
       .header("Access-Control-Allow-Origin", "*")
       .content_type("application/json")
-    .body(search_query(query))
+      .body(format!("{{\"error\": \"{}\"}}", "Empty query".to_string()));
+  }
+
+  match check_rate_limit_full(data, &ip, RATE_LIMIT, RATE_LIMIT_PER_SECOND) {
+    Ok(_) => HttpResponse::Ok()
+      .header("Access-Control-Allow-Origin", "*")
+      .content_type("application/json")
+      .body(search_query(query)),
+    Err(e) => HttpResponse::BadRequest()
+      .header("Access-Control-Allow-Origin", "*")
+      .content_type("application/json")
+      .body(format!("{{\"error\": \"{}\"}}", e.to_string())),
+  }
 }
 
-fn search_query(query: Query<SearchQuery>) -> String {
+fn search_query(query: web::Query<SearchQuery>) -> String {
   let page = query.page.unwrap_or(1);
   let size = query.size.unwrap_or(10);
   let type_ = query.type_.as_ref().map_or("torrent", String::deref);
   let offset = size * (page - 1);
 
-  println!("query = {}, type = {}, page = {}, size = {}", query.q, type_, page, size);
+  println!(
+    "query = {}, type = {}, page = {}, size = {}",
+    query.q, type_, page, size
+  );
 
   if type_ == "file" {
     let results = torrent_file_search(&query.q, size, offset);
@@ -93,11 +148,13 @@ fn torrent_search(query: &str, size: usize, offset: usize) -> Vec<Torrent> {
   let conn = Connection::open(torrents_db_file()).unwrap();
   let mut stmt = conn.prepare(&stmt_str).unwrap();
   let torrent_iter = stmt
-    .query_map(&[
+    .query_map(
+      &[
         query.replace(" ", "%"),
         size.to_string(),
         offset.to_string(),
-    ], |row| Torrent {
+      ],
+      |row| Torrent {
         infohash: row.get(0),
         name: row.get(1),
         size_bytes: row.get(2),
@@ -106,7 +163,9 @@ fn torrent_search(query: &str, size: usize, offset: usize) -> Vec<Torrent> {
         leechers: row.get(5),
         completed: row.get(6),
         scraped_date: row.get(7),
-    }).unwrap();
+      },
+    )
+    .unwrap();
 
   let mut torrents = Vec::new();
   for torrent in torrent_iter {
@@ -133,11 +192,13 @@ fn torrent_file_search(query: &str, size: usize, offset: usize) -> Vec<File> {
   let conn = Connection::open(torrents_db_file()).unwrap();
   let mut stmt = conn.prepare(&stmt_str).unwrap();
   let file_iter = stmt
-    .query_map(&[
+    .query_map(
+      &[
         query.replace(" ", "%"),
         size.to_string(),
         offset.to_string(),
-    ], |row| File {
+      ],
+      |row| File {
         infohash: row.get(0),
         index_: row.get(1),
         path: row.get(2),
@@ -147,7 +208,9 @@ fn torrent_file_search(query: &str, size: usize, offset: usize) -> Vec<File> {
         leechers: row.get(6),
         completed: row.get(7),
         scraped_date: row.get(8),
-    }).unwrap();
+      },
+    )
+    .unwrap();
 
   let mut files = Vec::new();
   for file in file_iter {
@@ -156,6 +219,56 @@ fn torrent_file_search(query: &str, size: usize, offset: usize) -> Vec<File> {
   files
 }
 
+fn check_rate_limit_full(
+  state: web::Data<State>,
+  ip: &str,
+  rate: i32,
+  per: i32,
+) -> Result<(), Error> {
+  let mut rate_limits = state.rate_limits.lock().unwrap();
+
+  if rate_limits.get_mut(ip).is_none() {
+    rate_limits.insert(
+      ip.to_string(),
+      RateLimitBucket {
+        last_checked: SystemTime::now(),
+        allowance: -2f64,
+      },
+    );
+  }
+  if let Some(rate_limit) = rate_limits.get_mut(ip) {
+    // The initial value
+    if rate_limit.allowance == -2f64 {
+      rate_limit.allowance = rate as f64;
+    };
+
+    let current = SystemTime::now();
+    let time_passed = current.duration_since(rate_limit.last_checked)?.as_secs() as f64;
+    rate_limit.last_checked = current;
+    rate_limit.allowance += time_passed * (rate as f64 / per as f64);
+    if rate_limit.allowance > rate as f64 {
+      rate_limit.allowance = rate as f64;
+    }
+
+    if rate_limit.allowance < 1.0 {
+      println!(
+        "Rate limited IP: {}, time_passed: {}, allowance: {}",
+        &ip, time_passed, rate_limit.allowance
+      );
+      Err(format_err!(
+        "Too many requests for IP: {}. {} per {} seconds",
+        &ip,
+        rate,
+        per
+      ))?
+    } else {
+      rate_limit.allowance -= 1.0;
+      Ok(())
+    }
+  } else {
+    Ok(())
+  }
+}
 
 #[cfg(test)]
 mod tests {
@@ -164,8 +277,7 @@ mod tests {
   #[test]
   fn test() {
     let start = PreciseTime::now();
-    let results =
-      super::torrent_search("sherlock", 10, 0);
+    let results = super::torrent_search("sherlock", 10, 0);
     assert!(results.len() > 2);
     let end = PreciseTime::now();
     println!("Query took {} seconds.", start.to(end));