simplify Handler trait

guide/src/qs_3.md

@@ -71,7 +71,7 @@ fn main() {
 
 ## Handler
 
-A request handler can have several different forms. 
+A request handler can have different forms. 
 
 * Simple function that accepts `HttpRequest` and returns `HttpResponse` or any 
    type that can be converted into `HttpResponse`. 

src/application.rs

@@ -34,6 +34,7 @@ impl<S: 'static> Application<S> {
         } else {
             for (prefix, handler) in &self.handlers {
                 if req.path().starts_with(prefix) {
+                    req.set_prefix(prefix.len());
                     handler.handle(req, task);
                     return
                 }
@@ -232,7 +233,6 @@ impl<S> ApplicationBuilder<S> where S: 'static {
 
         for (path, mut handler) in parts.handlers {
             let path = prefix.clone() + path.trim_left_matches('/');
-            handler.set_prefix(path.clone());
             handlers.insert(path, handler);
         }
         Application {

src/httprequest.rs

@@ -19,6 +19,7 @@ struct HttpMessage {
     version: Version,
     method: Method,
     path: String,
+    prefix: usize,
     query: String,
     headers: HeaderMap,
     extensions: Extensions,
@@ -35,6 +36,7 @@ impl Default for HttpMessage {
         HttpMessage {
             method: Method::GET,
             path: String::new(),
+            prefix: 0,
             query: String::new(),
             version: Version::HTTP_11,
             headers: HeaderMap::new(),
@@ -61,6 +63,7 @@ impl HttpRequest<()> {
             Rc::new(HttpMessage {
                 method: method,
                 path: path,
+                prefix: 0,
                 query: query,
                 version: version,
                 headers: headers,
@@ -123,6 +126,15 @@ impl<S> HttpRequest<S> {
         &self.0.path
     }
 
+    pub(crate) fn set_prefix(&mut self, idx: usize) {
+        self.as_mut().prefix = idx;
+    }
+
+    #[doc(hidden)]
+    pub fn prefix_len(&self) -> usize {
+        self.0.prefix
+    }
+
     /// Remote IP of client initiated HTTP request.
     ///
     /// The IP is resolved through the following headers, in this order:

src/route.rs

@@ -30,13 +30,12 @@ impl Frame {
 /// Trait defines object that could be regestered as route handler
 #[allow(unused_variables)]
 pub trait Handler<S>: 'static {
+
+    /// The type of value that handler will return.
     type Result: Into<Reply>;
 
     /// Handle request
     fn handle(&self, req: HttpRequest<S>) -> Self::Result;
-
-    /// Set route prefix
-    fn set_prefix(&mut self, prefix: String) {}
 }
 
 /// Handler<S> for Fn()
@@ -124,9 +123,6 @@ impl<A: Actor<Context=HttpContext<A, S>>, S: 'static> From<HttpContext<A, S>> fo
 pub(crate) trait RouteHandler<S>: 'static {
     /// Handle request
     fn handle(&self, req: HttpRequest<S>, task: &mut Task);
-
-    /// Set route prefix
-    fn set_prefix(&mut self, _prefix: String) {}
 }
 
 /// Route handler wrapper for Handler
@@ -158,10 +154,6 @@ impl<S, H, R> RouteHandler<S> for WrapHandler<S, H, R>
     fn handle(&self, req: HttpRequest<S>, task: &mut Task) {
         self.h.handle(req).into().into(task)
     }
-
-    fn set_prefix(&mut self, prefix: String) {
-        self.h.set_prefix(prefix)
-    }
 }
 
 /// Async route handler

src/staticfiles.rs

@@ -33,7 +33,6 @@ pub struct StaticFiles {
     _show_index: bool,
     _chunk_size: usize,
     _follow_symlinks: bool,
-    prefix: String,
 }
 
 impl StaticFiles {
@@ -65,12 +64,11 @@ impl StaticFiles {
             _show_index: index,
             _chunk_size: 0,
             _follow_symlinks: false,
-            prefix: String::new(),
         }
     }
 
-    fn index(&self, relpath: &str, filename: &PathBuf) -> Result<HttpResponse, io::Error> {
+    fn index(&self, prefix: &str, relpath: &str, filename: &PathBuf) -> Result<HttpResponse, io::Error> {
-        let index_of = format!("Index of {}/{}", self.prefix, relpath);
+        let index_of = format!("Index of {}{}", prefix, relpath);
         let mut body = String::new();
 
         for entry in filename.read_dir()? {
@@ -78,7 +76,7 @@ impl StaticFiles {
                 let entry = entry.unwrap();
                 // show file url as relative to static path
                 let file_url = format!(
-                    "{}/{}", self.prefix,
+                    "{}{}", prefix,
                     entry.path().strip_prefix(&self.directory).unwrap().to_string_lossy());
 
                 // if file is a directory, add '/' to the end of the name
@@ -130,18 +128,12 @@ impl StaticFiles {
 impl<S> Handler<S> for StaticFiles {
     type Result = Result<HttpResponse, io::Error>;
 
-    fn set_prefix(&mut self, prefix: String) {
-        if prefix != "/" {
-            self.prefix += &prefix;
-        }
-    }
-
     fn handle(&self, req: HttpRequest<S>) -> Self::Result {
         if !self.accessible {
             Ok(HTTPNotFound.into())
         } else {
             let mut hidden = false;
-            let filepath = req.path()[self.prefix.len()..]
+            let filepath = req.path()[req.prefix_len()..]
                 .split('/').filter(|s| {
                     if s.starts_with('.') {
                         hidden = true;
@@ -167,7 +159,9 @@ impl<S> Handler<S> for StaticFiles {
             };
 
             if filename.is_dir() {
-                match self.index(&filepath[idx..], &filename) {
+                match self.index(
+                    &req.path()[..req.prefix_len()], &filepath[idx..], &filename)
+                {
                     Ok(resp) => Ok(resp),
                     Err(err) => match err.kind() {
                         io::ErrorKind::NotFound => Ok(HTTPNotFound.into()),