ResourceMap: rework internals

src/app_service.rs

@@ -79,7 +79,7 @@ where
             .into_iter()
             .for_each(|mut srv| srv.register(&mut config));
 
-        let mut rmap = ResourceMap::new(ResourceDef::new(""));
+        let mut rmap = ResourceMap::new(ResourceDef::prefix(""));
 
         let (config, services) = config.into_services();
 
@@ -104,7 +104,7 @@ where
 
         // complete ResourceMap tree creation
         let rmap = Rc::new(rmap);
-        rmap.finish(rmap.clone());
+        ResourceMap::finish(&rmap);
 
         // construct all async data factory futures
         let factory_futs = join_all(self.async_data_factories.iter().map(|f| f()));

src/request.rs

@@ -511,7 +511,7 @@ mod tests {
         let mut res = ResourceDef::new("/user/{name}.{ext}");
         res.set_name("index");
 
-        let mut rmap = ResourceMap::new(ResourceDef::new(""));
+        let mut rmap = ResourceMap::new(ResourceDef::prefix(""));
         rmap.add(&mut res, None);
         assert!(rmap.has_resource("/user/test.html"));
         assert!(!rmap.has_resource("/test/unknown"));
@@ -541,7 +541,7 @@ mod tests {
         let mut rdef = ResourceDef::new("/index.html");
         rdef.set_name("index");
 
-        let mut rmap = ResourceMap::new(ResourceDef::new(""));
+        let mut rmap = ResourceMap::new(ResourceDef::prefix(""));
         rmap.add(&mut rdef, None);
 
         assert!(rmap.has_resource("/index.html"));
@@ -562,7 +562,7 @@ mod tests {
         let mut rdef = ResourceDef::new("/index.html");
         rdef.set_name("index");
 
-        let mut rmap = ResourceMap::new(ResourceDef::new(""));
+        let mut rmap = ResourceMap::new(ResourceDef::prefix(""));
         rmap.add(&mut rdef, None);
 
         assert!(rmap.has_resource("/index.html"));
@@ -581,9 +581,8 @@ mod tests {
 
         rdef.set_name("youtube");
 
-        let mut rmap = ResourceMap::new(ResourceDef::new(""));
+        let mut rmap = ResourceMap::new(ResourceDef::prefix(""));
         rmap.add(&mut rdef, None);
-        assert!(rmap.has_resource("https://youtube.com/watch/unknown"));
 
         let req = TestRequest::default().rmap(rmap).to_http_request();
         let url = req.url_for("youtube", &["oHg5SJYRHA0"]);

src/rmap.rs

@@ -10,36 +10,69 @@ use crate::request::HttpRequest;
 
 #[derive(Clone, Debug)]
 pub struct ResourceMap {
-    root: ResourceDef,
+    pattern: ResourceDef,
+
+    /// Named resources within the tree or, for external resources,
+    /// it points to isolated nodes outside the tree.
+    named: AHashMap<String, Rc<ResourceMap>>,
+
     parent: RefCell<Weak<ResourceMap>>,
-    named: AHashMap<String, ResourceDef>,
+
-    patterns: Vec<(ResourceDef, Option<Rc<ResourceMap>>)>,
+    /// Must be `None` for "edge" nodes.
+    nodes: Option<Vec<Rc<ResourceMap>>>,
 }
 
 impl ResourceMap {
+    /// Creates a _container_ node in the `ResourceMap` tree.
     pub fn new(root: ResourceDef) -> Self {
         ResourceMap {
-            root,
+            pattern: root,
-            parent: RefCell::new(Weak::new()),
             named: AHashMap::default(),
-            patterns: Vec::new(),
+            parent: RefCell::new(Weak::new()),
+            nodes: Some(Vec::new()),
         }
     }
 
+    /// Adds a (possibly nested) resource.
+    ///
+    /// To add a non-prefix pattern, `nested` must be `None`.
+    /// To add external resource, supply a pattern without a leading `/`.
+    /// The root pattern of `nested`, if present, should match `pattern`.
     pub fn add(&mut self, pattern: &mut ResourceDef, nested: Option<Rc<ResourceMap>>) {
-        pattern.set_id(self.patterns.len() as u16);
+        pattern.set_id(self.nodes.as_ref().unwrap().len() as u16);
-        self.patterns.push((pattern.clone(), nested));
+
+        if let Some(new_node) = nested {
+            assert_eq!(&new_node.pattern, pattern, "`patern` and `nested` mismatch");
+            self.named.extend(new_node.named.clone().into_iter());
+            self.nodes.as_mut().unwrap().push(new_node);
+        } else {
+            let new_node = Rc::new(ResourceMap {
+                pattern: pattern.clone(),
+                named: AHashMap::default(),
+                parent: RefCell::new(Weak::new()),
+                nodes: None,
+            });
+
             if let Some(name) = pattern.name() {
-            self.named.insert(name.to_owned(), pattern.clone());
+                self.named.insert(name.to_owned(), Rc::clone(&new_node));
+            }
+
+            let is_external = match pattern.pattern() {
+                Some(p) => !p.is_empty() && !p.starts_with('/'),
+                None => false,
+            };
+
+            // Don't add external resources to the tree
+            if !is_external {
+                self.nodes.as_mut().unwrap().push(new_node);
+            }
         }
     }
 
-    pub(crate) fn finish(&self, current: Rc<ResourceMap>) {
+    pub(crate) fn finish(self: &Rc<Self>) {
-        for (_, nested) in &self.patterns {
+        for node in self.nodes.iter().flatten() {
-            if let Some(ref nested) = nested {
+            node.parent.replace(Rc::downgrade(self));
-                *nested.parent.borrow_mut() = Rc::downgrade(&current);
+            Self::finish(node);
-                nested.finish(nested.clone());
-            }
         }
     }
 
@@ -57,10 +90,24 @@ impl ResourceMap {
         U: IntoIterator<Item = I>,
         I: AsRef<str>,
     {
-        let mut path = String::new();
         let mut elements = elements.into_iter();
 
-        if self.patterns_for(name, &mut path, &mut elements)?.is_some() {
+        let path = self
+            .named
+            .get(name)
+            .ok_or(UrlGenerationError::ResourceNotFound)?
+            .fold_parents(String::new(), |mut acc, node| {
+                if node
+                    .pattern
+                    .resource_path_from_iter(&mut acc, &mut elements)
+                {
+                    Some(acc)
+                } else {
+                    None
+                }
+            })
+            .ok_or(UrlGenerationError::NotEnoughElements)?;
+
         if path.starts_with('/') {
             let conn = req.connection_info();
             Ok(Url::parse(&format!(
@@ -72,182 +119,69 @@ impl ResourceMap {
         } else {
             Ok(Url::parse(&path)?)
         }
-        } else {
-            Err(UrlGenerationError::ResourceNotFound)
-        }
     }
 
     pub fn has_resource(&self, path: &str) -> bool {
-        let path = if path.is_empty() { "/" } else { path };
+        self.find_matching_node(path).is_some()
-
-        for (pattern, rmap) in &self.patterns {
-            if let Some(ref rmap) = rmap {
-                if let Some(pat_len) = pattern.find_match(path) {
-                    return rmap.has_resource(&path[pat_len..]);
-                }
-            } else if pattern.is_match(path) || pattern.pattern() == Some("") && path == "/" {
-                return true;
-            }
-        }
-        false
     }
 
     /// Returns the name of the route that matches the given path or None if no full match
-    /// is possible.
+    /// is possible or the matching resource is not named.
     pub fn match_name(&self, path: &str) -> Option<&str> {
-        let path = if path.is_empty() { "/" } else { path };
+        self.find_matching_node(path)?.pattern.name()
-
-        for (pattern, rmap) in &self.patterns {
-            if let Some(ref rmap) = rmap {
-                if let Some(plen) = pattern.find_match(path) {
-                    return rmap.match_name(&path[plen..]);
-                }
-            } else if pattern.is_match(path) {
-                return pattern.name();
-            }
-        }
-
-        None
     }
 
     /// Returns the full resource pattern matched against a path or None if no full match
     /// is possible.
     pub fn match_pattern(&self, path: &str) -> Option<String> {
-        let path = if path.is_empty() { "/" } else { path };
+        self.find_matching_node(path)?
-
+            .fold_parents(String::new(), |mut acc, node| {
-        // ensure a full match exists
+                acc.push_str(node.pattern.pattern()?);
-        if !self.has_resource(path) {
+                Some(acc)
-            return None;
+            })
     }
 
-        Some(self.traverse_resource_pattern(path))
+    fn find_matching_node(&self, path: &str) -> Option<&ResourceMap> {
+        self._find_matching_node(path).flatten()
     }
 
-    /// Takes remaining path and tries to match it up against a resource definition within the
+    /// Returns `None` if root pattern doesn't match;
-    /// current resource map recursively, returning a concatenation of all resource prefixes and
+    /// `Some(None)` if root pattern matches but there is no matching child pattern.
-    /// patterns matched in the tree.
+    /// Don't search sideways when `Some(none)` is returned.
-    ///
+    fn _find_matching_node(&self, path: &str) -> Option<Option<&ResourceMap>> {
-    /// Should only be used after checking the resource exists in the map so that partial match
+        let matched_len = self.pattern.find_match(path)?;
-    /// patterns are not returned.
+        let path = &path[matched_len..];
-    fn traverse_resource_pattern(&self, remaining: &str) -> String {
-        for (pattern, rmap) in &self.patterns {
-            if let Some(ref rmap) = rmap {
-                if let Some(prefix_len) = pattern.find_match(remaining) {
-                    // TODO: think about unwrap_or
-                    let prefix = pattern.pattern().unwrap_or("").to_owned();
 
-                    return [
+        Some(match &self.nodes {
-                        prefix,
+            Some(nodes) => nodes
-                        rmap.traverse_resource_pattern(&remaining[prefix_len..]),
+                .iter()
-                    ]
+                .filter_map(|node| node._find_matching_node(path))
-                    .concat();
+                .next()
-                }
+                .flatten(),
-            } else if pattern.is_match(remaining) {
+
-                // TODO: think about unwrap_or
+            // only terminate at edge nodes
-                return pattern.pattern().unwrap_or("").to_owned();
+            None => Some(self),
-            }
+        })
     }
 
-        String::new()
+    /// Folds the parents from the root of the tree to self.
-    }
+    fn fold_parents<F, B>(&self, init: B, mut f: F) -> Option<B>
-
-    fn patterns_for<U, I>(
-        &self,
-        name: &str,
-        path: &mut String,
-        elements: &mut U,
-    ) -> Result<Option<()>, UrlGenerationError>
     where
-        U: Iterator<Item = I>,
+        F: FnMut(B, &ResourceMap) -> Option<B>,
-        I: AsRef<str>,
     {
-        if self.pattern_for(name, path, elements)?.is_some() {
+        self._fold_parents(init, &mut f)
-            Ok(Some(()))
-        } else {
-            self.parent_pattern_for(name, path, elements)
-        }
     }
 
-    fn pattern_for<U, I>(
+    fn _fold_parents<F, B>(&self, init: B, f: &mut F) -> Option<B>
-        &self,
-        name: &str,
-        path: &mut String,
-        elements: &mut U,
-    ) -> Result<Option<()>, UrlGenerationError>
     where
-        U: Iterator<Item = I>,
+        F: FnMut(B, &ResourceMap) -> Option<B>,
-        I: AsRef<str>,
     {
-        if let Some(pattern) = self.named.get(name) {
+        let data = match self.parent.borrow().upgrade() {
-            if pattern
+            Some(ref parent) => parent._fold_parents(init, f)?,
-                .pattern()
+            None => init,
-                .map(|pat| pat.starts_with('/'))
+        };
-                .unwrap_or(false)
-            {
-                self.fill_root(path, elements)?;
-            }
 
-            if pattern.resource_path_from_iter(path, elements) {
+        f(data, self)
-                Ok(Some(()))
-            } else {
-                Err(UrlGenerationError::NotEnoughElements)
-            }
-        } else {
-            for (_, rmap) in &self.patterns {
-                if let Some(ref rmap) = rmap {
-                    if rmap.pattern_for(name, path, elements)?.is_some() {
-                        return Ok(Some(()));
-                    }
-                }
-            }
-            Ok(None)
-        }
-    }
-
-    fn fill_root<U, I>(
-        &self,
-        path: &mut String,
-        elements: &mut U,
-    ) -> Result<(), UrlGenerationError>
-    where
-        U: Iterator<Item = I>,
-        I: AsRef<str>,
-    {
-        if let Some(ref parent) = self.parent.borrow().upgrade() {
-            parent.fill_root(path, elements)?;
-        }
-
-        if self.root.resource_path_from_iter(path, elements) {
-            Ok(())
-        } else {
-            Err(UrlGenerationError::NotEnoughElements)
-        }
-    }
-
-    fn parent_pattern_for<U, I>(
-        &self,
-        name: &str,
-        path: &mut String,
-        elements: &mut U,
-    ) -> Result<Option<()>, UrlGenerationError>
-    where
-        U: Iterator<Item = I>,
-        I: AsRef<str>,
-    {
-        if let Some(ref parent) = self.parent.borrow().upgrade() {
-            if let Some(pattern) = parent.named.get(name) {
-                self.fill_root(path, elements)?;
-                if pattern.resource_path_from_iter(path, elements) {
-                    Ok(Some(()))
-                } else {
-                    Err(UrlGenerationError::NotEnoughElements)
-                }
-            } else {
-                parent.parent_pattern_for(name, path, elements)
-            }
-        } else {
-            Ok(None)
-        }
     }
 }
 
@@ -259,7 +193,7 @@ mod tests {
     fn extract_matched_pattern() {
         let mut root = ResourceMap::new(ResourceDef::root_prefix(""));
 
-        let mut user_map = ResourceMap::new(ResourceDef::root_prefix(""));
+        let mut user_map = ResourceMap::new(ResourceDef::root_prefix("/user/{id}"));
         user_map.add(&mut ResourceDef::new("/"), None);
         user_map.add(&mut ResourceDef::new("/profile"), None);
         user_map.add(&mut ResourceDef::new("/article/{id}"), None);
@@ -275,9 +209,10 @@ mod tests {
             &mut ResourceDef::root_prefix("/user/{id}"),
             Some(Rc::new(user_map)),
         );
+        root.add(&mut ResourceDef::new("/info"), None);
 
         let root = Rc::new(root);
-        root.finish(Rc::clone(&root));
+        ResourceMap::finish(&root);
 
         // sanity check resource map setup
 
@@ -288,7 +223,7 @@ mod tests {
         assert!(root.has_resource("/v2"));
         assert!(!root.has_resource("/v33"));
 
-        assert!(root.has_resource("/user/22"));
+        assert!(!root.has_resource("/user/22"));
         assert!(root.has_resource("/user/22/"));
         assert!(root.has_resource("/user/22/profile"));
 
@@ -336,7 +271,7 @@ mod tests {
         rdef.set_name("root_info");
         root.add(&mut rdef, None);
 
-        let mut user_map = ResourceMap::new(ResourceDef::root_prefix(""));
+        let mut user_map = ResourceMap::new(ResourceDef::root_prefix("/user/{id}"));
         let mut rdef = ResourceDef::new("/");
         user_map.add(&mut rdef, None);
 
@@ -350,14 +285,14 @@ mod tests {
         );
 
         let root = Rc::new(root);
-        root.finish(Rc::clone(&root));
+        ResourceMap::finish(&root);
 
         // sanity check resource map setup
 
         assert!(root.has_resource("/info"));
         assert!(!root.has_resource("/bar"));
 
-        assert!(root.has_resource("/user/22"));
+        assert!(!root.has_resource("/user/22"));
         assert!(root.has_resource("/user/22/"));
         assert!(root.has_resource("/user/22/post/55"));
 
@@ -377,7 +312,7 @@ mod tests {
         // ref: https://github.com/actix/actix-web/issues/1582
         let mut root = ResourceMap::new(ResourceDef::root_prefix(""));
 
-        let mut user_map = ResourceMap::new(ResourceDef::root_prefix(""));
+        let mut user_map = ResourceMap::new(ResourceDef::root_prefix("/user/{id}"));
         user_map.add(&mut ResourceDef::new("/"), None);
         user_map.add(&mut ResourceDef::new("/profile"), None);
         user_map.add(&mut ResourceDef::new("/article/{id}"), None);
@@ -393,20 +328,50 @@ mod tests {
         );
 
         let root = Rc::new(root);
-        root.finish(Rc::clone(&root));
+        ResourceMap::finish(&root);
 
         // check root has no parent
         assert!(root.parent.borrow().upgrade().is_none());
         // check child has parent reference
-        assert!(root.patterns[0].1.is_some());
+        assert!(root.nodes.as_ref().unwrap()[0]
+            .parent
+            .borrow()
+            .upgrade()
+            .is_some());
         // check child's parent root id matches root's root id
-        assert_eq!(
+        assert!(Rc::ptr_eq(
-            root.patterns[0].1.as_ref().unwrap().root.id(),
+            &root.nodes.as_ref().unwrap()[0]
-            root.root.id()
+                .parent
-        );
+                .borrow()
+                .upgrade()
+                .unwrap(),
+            &root
+        ));
 
         let output = format!("{:?}", root);
         assert!(output.starts_with("ResourceMap {"));
         assert!(output.ends_with(" }"));
     }
+
+    #[test]
+    fn short_circuit() {
+        let mut root = ResourceMap::new(ResourceDef::prefix(""));
+
+        let mut user_root = ResourceDef::prefix("/user");
+        let mut user_map = ResourceMap::new(user_root.clone());
+        user_map.add(&mut ResourceDef::new("/u1"), None);
+        user_map.add(&mut ResourceDef::new("/u2"), None);
+
+        root.add(&mut ResourceDef::new("/user/u3"), None);
+        root.add(&mut user_root, Some(Rc::new(user_map)));
+        root.add(&mut ResourceDef::new("/user/u4"), None);
+
+        let rmap = Rc::new(root);
+        ResourceMap::finish(&rmap);
+
+        assert!(rmap.has_resource("/user/u1"));
+        assert!(rmap.has_resource("/user/u2"));
+        assert!(rmap.has_resource("/user/u3"));
+        assert!(!rmap.has_resource("/user/u4"));
+    }
 }