index : static-web-server.git

use std::net::{IpAddr, SocketAddr};
use structopt::StructOpt;
use warp::Filter;

use crate::config::{Config, CONFIG};
use crate::{cache, cors, filters, helpers, logger, rejection, signals, Result};

/// Define a multi-thread HTTP/HTTPS web server.
pub struct Server {
    threads: usize,
}

impl Server {
    /// Create new multi-thread server instance.
    pub fn new() -> Self {
        // Initialize global config
        CONFIG.set(Config::from_args()).unwrap();
        let opts = Config::global();

        let threads = match opts.threads_multiplier {
            0 | 1 => 1,
            _ => num_cpus::get() * opts.threads_multiplier,
        };
        Self { threads }
    }

    /// Build and run the `Server` forever on the current thread.
    pub fn run(self) -> Result {
        tokio::runtime::Builder::new_multi_thread()
            .enable_all()
            .thread_name("static-web-server")
            .worker_threads(self.threads)
            .build()?
            .block_on(async {
                let r = self.start_server().await;
                if r.is_err() {
                    panic!("Server error during start up: {:?}", r.unwrap_err())
                }
            });

        Ok(())
    }

    /// Run the inner `Warp` server forever on the current thread.
    async fn start_server(self) -> Result {
        let opts = Config::global();

        logger::init(&opts.log_level)?;

        tracing::info!("runtime worker threads {}", self.threads);
        tracing::info!("runtime max blocking threads {}", self.threads);

        let ip = opts.host.parse::<IpAddr>()?;
        let addr = SocketAddr::from((ip, opts.port));

        // Check for a valid root directory
        let root_dir = helpers::get_valid_dirpath(&opts.root)?;

        // Custom error pages content
        rejection::PAGE_404
            .set(helpers::read_file_content(opts.page404.as_ref()))
            .expect("page 404 is not initialized");
        rejection::PAGE_50X
            .set(helpers::read_file_content(opts.page50x.as_ref()))
            .expect("page 50x is not initialized");

        // CORS support
        let (cors_filter_opt, cors_allowed_origins) =
            cors::get_opt_cors_filter(opts.cors_allow_origins.as_ref());

        // Base fs directory filter
        let base_fs_dir_filter = warp::fs::dir(root_dir.clone())
            .map(cache::control_headers)
            .with(warp::trace::request())
            .recover(rejection::handle_rejection);

        // Public HEAD endpoint
        let public_head = warp::head().and(base_fs_dir_filter.clone());

        // Public GET endpoint (default)
        let public_get_default = warp::get().and(base_fs_dir_filter);

        // HTTP/2 + TLS
        let http2 = opts.http2;
        let http2_tls_cert_path = &opts.http2_tls_cert;
        let http2_tls_key_path = &opts.http2_tls_key;

        // Public GET/HEAD endpoints with compression (gzip, brotli or none)
        match opts.compression.as_ref() {
            "brotli" => tokio::task::spawn(async move {
                let fs_dir_filter = warp::fs::dir(root_dir)
                    .map(cache::control_headers)
                    .with(warp::compression::brotli(true))
                    .with(warp::trace::request())
                    .recover(rejection::handle_rejection);

                match cors_filter_opt {
                    Some(cors_filter) => {
                        tracing::info!(
                            cors_enabled = ?true,
                            allowed_origins = ?cors_allowed_origins
                        );

                        let public_head = public_head.with(cors_filter.clone());
                        let public_get_default = public_get_default.with(cors_filter.clone());

                        let public_get = warp::get()
                            .and(filters::has_accept_encoding("br"))
                            .and(fs_dir_filter)
                            .with(cors_filter.clone());

                        let server = warp::serve(public_head.or(public_get).or(public_get_default));

                        if http2 {
                            server
                                .tls()
                                .cert_path(http2_tls_cert_path)
                                .key_path(http2_tls_key_path)
                                .run(addr)
                                .await;
                        } else {
                            server.run(addr).await
                        }
                    }
                    None => {
                        let public_get = warp::get()
                            .and(filters::has_accept_encoding("br"))
                            .and(fs_dir_filter);

                        let server = warp::serve(public_head.or(public_get).or(public_get_default));

                        if http2 {
                            server
                                .tls()
                                .cert_path(http2_tls_cert_path)
                                .key_path(http2_tls_key_path)
                                .run(addr)
                                .await;
                        } else {
                            server.run(addr).await
                        }
                    }
                }
            }),
            "gzip" => tokio::task::spawn(async move {
                let fs_dir_filter = warp::fs::dir(root_dir)
                    .map(cache::control_headers)
                    .with(warp::compression::gzip(true))
                    .with(warp::trace::request())
                    .recover(rejection::handle_rejection);

                match cors_filter_opt {
                    Some(cors_filter) => {
                        tracing::info!(
                            cors_enabled = ?true,
                            allowed_origins = ?cors_allowed_origins
                        );

                        let public_head = public_head.with(cors_filter.clone());
                        let public_get_default = public_get_default.with(cors_filter.clone());

                        let public_get = warp::get()
                            .and(filters::has_accept_encoding("gzip"))
                            .and(fs_dir_filter)
                            .with(cors_filter.clone());

                        let server = warp::serve(public_head.or(public_get).or(public_get_default));

                        if http2 {
                            server
                                .tls()
                                .cert_path(http2_tls_cert_path)
                                .key_path(http2_tls_key_path)
                                .run(addr)
                                .await;
                        } else {
                            server.run(addr).await
                        }
                    }
                    None => {
                        let public_get = warp::get()
                            .and(filters::has_accept_encoding("gzip"))
                            .and(fs_dir_filter);

                        let server = warp::serve(public_head.or(public_get).or(public_get_default));

                        if http2 {
                            server
                                .tls()
                                .cert_path(http2_tls_cert_path)
                                .key_path(http2_tls_key_path)
                                .run(addr)
                                .await;
                        } else {
                            server.run(addr).await
                        }
                    }
                }
            }),
            _ => tokio::task::spawn(async move {
                match cors_filter_opt {
                    Some(cors_filter) => {
                        tracing::info!(
                            cors_enabled = ?true,
                            allowed_origins = ?cors_allowed_origins
                        );

                        let public_get = public_get_default.with(cors_filter.clone());

                        let server = warp::serve(public_head.or(public_get));

                        if http2 {
                            server
                                .tls()
                                .cert_path(http2_tls_cert_path)
                                .key_path(http2_tls_key_path)
                                .run(addr)
                                .await;
                        } else {
                            server.run(addr).await
                        }
                    }
                    None => {
                        let server = warp::serve(public_head.or(public_get_default));

                        if http2 {
                            server
                                .tls()
                                .cert_path(http2_tls_cert_path)
                                .key_path(http2_tls_key_path)
                                .run(addr)
                                .await;
                        } else {
                            server.run(addr).await
                        }
                    }
                }
            }),
        };

        signals::wait(|sig: signals::Signal| {
            let code = signals::as_int(sig);
            tracing::warn!("Signal {} caught. Server execution exited.", code);
            std::process::exit(code)
        });

        Ok(())
    }
}

impl Default for Server {
    fn default() -> Self {
        Self::new()
    }
}