Do not panic if something is already bound to 1111 in serve

CHANGELOG.md

@@ -33,6 +33,7 @@ sections up to the index to be used with the `get_section` Tera function
 - Add a `load_data` Tera function to load local CSV/TOML/JSON files
 - Add `relative_path` to pages and sections in templates
 - Do not have a trailing slash for the RSS permalinks
+- `serve` will now try to find other ports than 1111 rather than panicking
 
 ## 0.4.2 (2018-09-03)
 

components/site/src/lib.rs

@@ -146,8 +146,11 @@ impl Site {
         self.content_path.join("_index.md")
     }
 
-    pub fn enable_live_reload(&mut self) {
-        self.live_reload = get_available_port();
+    /// We avoid the port the server is going to use as it's not bound yet
+    /// when calling this function and we could end up having tried to bind
+    /// both http and websocket server to the same port
+    pub fn enable_live_reload(&mut self, port_to_avoid: u16) {
+        self.live_reload = get_available_port(port_to_avoid);
     }
 
     /// Get all the orphan (== without section) pages in the site

components/utils/src/net.rs

@@ -1,12 +1,12 @@
 use std::net::TcpListener;
 
 
-pub fn get_available_port() -> Option<u16> {
+pub fn get_available_port(avoid: u16) -> Option<u16> {
     (1000..9000)
-        .find(|port| port_is_available(*port))
+        .find(|port| *port != avoid && port_is_available(*port))
 }
 
-fn port_is_available(port: u16) -> bool {
+pub fn port_is_available(port: u16) -> bool {
     match TcpListener::bind(("127.0.0.1", port)) {
         Ok(_) => true,
         Err(_) => false,

src/cmd/serve.rs

@@ -108,7 +108,7 @@ fn rebuild_done_handling(broadcaster: &Sender, res: Result<()>, reload_path: &st
     }
 }
 
-fn create_new_site(interface: &str, port: &str, output_dir: &str, base_url: &str, config_file: &str) -> Result<(Site, String)> {
+fn create_new_site(interface: &str, port: u16, output_dir: &str, base_url: &str, config_file: &str) -> Result<(Site, String)> {
     let mut site = Site::new(env::current_dir().unwrap(), config_file)?;
 
     let base_address = format!("{}:{}", base_url, port);
@@ -122,7 +122,7 @@ fn create_new_site(interface: &str, port: &str, output_dir: &str, base_url: &str
     site.set_base_url(base_url);
     site.set_output_path(output_dir);
     site.load()?;
-    site.enable_live_reload();
+    site.enable_live_reload(port);
     console::notify_site_size(&site);
     console::warn_about_ignored_pages(&site);
     site.build()?;
@@ -147,7 +147,7 @@ fn handle_directory<'a, 'b>(dir: &'a fs::Directory, req: &'b HttpRequest) -> io:
     fs::NamedFile::open(path)?.respond_to(req)
 }
 
-pub fn serve(interface: &str, port: &str, output_dir: &str, base_url: &str, config_file: &str) -> Result<()> {
+pub fn serve(interface: &str, port: u16, output_dir: &str, base_url: &str, config_file: &str) -> Result<()> {
     let start = Instant::now();
     let (mut site, address) = create_new_site(interface, port, output_dir, base_url, config_file)?;
     console::report_elapsed_time(start);

src/main.rs

@@ -20,6 +20,8 @@ extern crate rebuild;
 
 use std::time::Instant;
 
+use utils::net::{get_available_port, port_is_available};
+
 mod cmd;
 mod console;
 mod cli;
@@ -55,7 +57,28 @@ fn main() {
         },
         ("serve", Some(matches)) => {
             let interface = matches.value_of("interface").unwrap_or("127.0.0.1");
-            let port = matches.value_of("port").unwrap_or("1111");
+            let mut port: u16 = match matches.value_of("port").unwrap().parse() {
+                Ok(x) => x,
+                Err(_) => {
+                    console::error("The request port needs to be an integer");
+                    ::std::process::exit(1);
+                }
+            };
+            // Default one
+            if port != 1111 && !port_is_available(port) {
+                console::error("The requested port is not available");
+                ::std::process::exit(1);
+            }
+
+            if !port_is_available(port) {
+                port = if let Some(p) = get_available_port(1111) {
+                    p
+                } else {
+                    console::error("No port available.");
+                    ::std::process::exit(1);
+                }
+            }
+
             let output_dir = matches.value_of("output_dir").unwrap();
             let base_url = matches.value_of("base_url").unwrap();
             console::info("Building site...");