Use SIGINT stop signal in Docker Compose example

Cargo.toml

@@ -13,7 +13,7 @@ lto = true
 codegen-units = 1
 
 [dependencies]
-actix-web = "4.4.0"
+hyper = { version = "0.14.27", default-features = false, features = ["http1", "server", "runtime"] }
 linemux = "0.3.0"
 path-slash = "0.2.1"
 prometheus-client = "0.21.2"

docker/docker-compose.yml

@@ -46,6 +46,7 @@ services:
       HTTP_HOST: "0.0.0.0"
       ACCESS_LOG_FILE_PATTERN: "/logs/*.access.log"
       ERROR_LOG_FILE_PATTERN: "/logs/*.error.log"
+    stop_signal: SIGINT
     restart: "always"
 
 volumes: 

src/main.rs

@@ -1,5 +1,7 @@
 use std::env;
+use std::net::{IpAddr, SocketAddr};
 use std::process::ExitCode;
+use std::str::FromStr;
 use std::sync::Mutex;
 
 use tokio::signal;
@@ -8,7 +10,7 @@ use tokio::sync::mpsc;
 use crate::apache_metrics::ApacheMetrics;
 use crate::log_file_pattern::{LogFilePath, parse_log_file_pattern_from_env};
 use crate::log_watcher::watch_logs_task;
-use crate::web_server::{create_web_server, run_web_server};
+use crate::web_server::WebServer;
 
 mod apache_metrics;
 mod log_file_pattern;
@@ -51,6 +53,13 @@ fn find_log_files(environment_variable_name: &str, log_kind: &str) -> Option<Vec
 #[tokio::main(flavor = "current_thread")]
 async fn main() -> ExitCode {
 	let host = env::var("HTTP_HOST").unwrap_or(String::from("127.0.0.1"));
+	let bind_ip = match IpAddr::from_str(&host) {
+		Ok(addr) => addr,
+		Err(_) => {
+			println!("Invalid HTTP host: {}", host);
+			return ExitCode::FAILURE;
+		}
+	};
 	
 	println!("Initializing exporter...");
 	
@@ -64,11 +73,16 @@ async fn main() -> ExitCode {
 		None => return ExitCode::FAILURE,
 	};
 	
+	let server = match WebServer::try_bind(SocketAddr::new(bind_ip, 9240)) {
+		Some(server) => server,
+		None => return ExitCode::FAILURE
+	};
+	
 	let (metrics_registry, metrics) = ApacheMetrics::new();
 	let (shutdown_send, mut shutdown_recv) = mpsc::unbounded_channel();
 	
 	tokio::spawn(watch_logs_task(access_log_files, error_log_files, metrics.clone(), shutdown_send.clone()));
-	tokio::spawn(run_web_server(create_web_server(host.as_str(), 9240, Mutex::new(metrics_registry))));
+	tokio::spawn(server.serve(Mutex::new(metrics_registry)));
 	
 	drop(shutdown_send);
 	

src/web_server.rs

@@ -1,55 +1,81 @@
-use std::{fmt, str};
-use std::sync::Mutex;
+use std::fmt;
+use std::net::SocketAddr;
+use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
-use actix_web::{App, HttpResponse, HttpServer, Result, web};
-use actix_web::dev::Server;
+use hyper::{Body, Error, header, Method, Request, Response, Server, StatusCode};
+use hyper::http::Result;
+use hyper::server::Builder;
+use hyper::server::conn::AddrIncoming;
+use hyper::service::{make_service_fn, service_fn};
 use prometheus_client::encoding::text::encode;
 use prometheus_client::registry::Registry;
 
-//noinspection HttpUrlsUsage
-pub fn create_web_server(host: &str, port: u16, metrics_registry: Mutex<Registry>) -> Server {
-	let metrics_registry = web::Data::new(metrics_registry);
+const MAX_BUFFER_SIZE: usize = 1024 * 32;
 
-	let server = HttpServer::new(move || {
-		App::new()
-			.app_data(metrics_registry.clone())
-			.service(web::resource("/metrics").route(web::get().to(metrics_handler)))
-	});
-	
-	let server = server.keep_alive(Duration::from_secs(60));
-	let server = server.shutdown_timeout(0);
-	let server = server.disable_signals();
-	let server = server.workers(1);
-	let server = server.bind((host, port));
-
-	println!("[WebServer] Starting web server on {0}:{1} with metrics endpoint: http://{0}:{1}/metrics", host, port);
-	server.unwrap().run()
+pub struct WebServer {
+	builder: Builder<AddrIncoming>,
 }
 
-pub async fn run_web_server(server: Server) {
-	if let Err(e) = server.await {
-		println!("[WebServer] Error running web server: {}", e);
+impl WebServer {
+	//noinspection HttpUrlsUsage
+	pub fn try_bind(addr: SocketAddr) -> Option<WebServer> {
+		println!("[WebServer] Starting web server on {0} with metrics endpoint: http://{0}/metrics", addr);
+		let builder = match Server::try_bind(&addr) {
+			Ok(builder) => builder,
+			Err(e) => {
+				println!("[WebServer] Could not bind to {}: {}", addr, e);
+				return None;
+			}
+		};
+		
+		let builder = builder.tcp_keepalive(Some(Duration::from_secs(60)));
+		let builder = builder.http1_only(true);
+		let builder = builder.http1_keepalive(true);
+		let builder = builder.http1_max_buf_size(MAX_BUFFER_SIZE);
+		let builder = builder.http1_header_read_timeout(Duration::from_secs(10));
+		
+		Some(WebServer { builder })
+	}
+	
+	pub async fn serve(self, metrics_registry: Mutex<Registry>) {
+		let metrics_registry = Arc::new(metrics_registry);
+		let service = make_service_fn(move |_| {
+			let metrics_registry = Arc::clone(&metrics_registry);
+			async move {
+				Ok::<_, Error>(service_fn(move |req| handle_request(req, Arc::clone(&metrics_registry))))
+			}
+		});
+		
+		if let Err(e) = self.builder.serve(service).await {
+			println!("[WebServer] Error starting web server: {}", e);
+		}
+	}
+}
+
+async fn handle_request(req: Request<Body>, metrics_registry: Arc<Mutex<Registry>>) -> Result<Response<Body>> {
+	if req.method() == Method::GET && req.uri().path() == "/metrics" {
+		metrics_handler(Arc::clone(&metrics_registry)).await
+	} else {
+		Response::builder().status(StatusCode::NOT_FOUND).body(Body::empty())
 	}
 }
 
 //noinspection SpellCheckingInspection
-async fn metrics_handler(metrics_registry: web::Data<Mutex<Registry>>) -> Result<HttpResponse> {
-	let response = match encode_metrics(metrics_registry) {
+async fn metrics_handler(metrics_registry: Arc<Mutex<Registry>>) -> Result<Response<Body>> {
+	match encode_metrics(metrics_registry) {
 		MetricsEncodeResult::Ok(buf) => {
-			HttpResponse::Ok().content_type("application/openmetrics-text; version=1.0.0; charset=utf-8").body(buf)
+			Response::builder().status(StatusCode::OK).header(header::CONTENT_TYPE, "application/openmetrics-text; version=1.0.0; charset=utf-8").body(Body::from(buf))
 		}
 		MetricsEncodeResult::FailedAcquiringRegistryLock => {
 			println!("[WebServer] Failed acquiring lock on registry.");
-			HttpResponse::InternalServerError().body("")
+			Response::builder().status(StatusCode::INTERNAL_SERVER_ERROR).body(Body::empty())
 		}
 		MetricsEncodeResult::FailedEncodingMetrics(e) => {
 			println!("[WebServer] Error encoding metrics: {}", e);
-			HttpResponse::InternalServerError().body("")
+			Response::builder().status(StatusCode::INTERNAL_SERVER_ERROR).body(Body::empty())
+		}
 	}
-	};
-	
-	Ok(response)
 }
 
 enum MetricsEncodeResult {
@@ -58,12 +84,12 @@ enum MetricsEncodeResult {
 	FailedEncodingMetrics(fmt::Error),
 }
 
-fn encode_metrics(metrics_registry: web::Data<Mutex<Registry>>) -> MetricsEncodeResult {
+fn encode_metrics(metrics_registry: Arc<Mutex<Registry>>) -> MetricsEncodeResult {
 	let mut buf = String::new();
 	
 	return if let Ok(metrics_registry) = metrics_registry.lock() {
 		encode(&mut buf, &metrics_registry).map_or_else(MetricsEncodeResult::FailedEncodingMetrics, |_| MetricsEncodeResult::Ok(buf))
 	} else {
 		MetricsEncodeResult::FailedAcquiringRegistryLock
-	}
+	};
 }