mirror of https://github.com/rwf2/Rocket.git
Cleaned up routing code. It's nearing completion!
* Should be able to write a simple O(n) router using the collision functions. * Still need to split things up into multiple files.
This commit is contained in:
Sergio Benitez
parent
40559736fc
commit
3764afbf1e
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@ -1,3 +1,5 @@
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#![feature(str_char)]
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extern crate hyper;
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pub mod method;
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@ -59,7 +61,8 @@ impl Rocket {
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}
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}
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pub fn mount(&mut self, base: &str, routes: &[&Route<'static>]) -> &mut Self {
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pub fn mount(&mut self, base: &'static str, routes: &[&Route<'static>])
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-> &mut Self {
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println!("🛰 Mounting '{}':", base);
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for route in routes {
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if self.handler.is_none() {
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@ -74,7 +77,8 @@ impl Rocket {
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self
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}
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pub fn mount_and_launch(mut self, base: &str, routes: &[&Route<'static>]) {
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pub fn mount_and_launch(mut self, base: &'static str,
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routes: &[&Route<'static>]) {
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self.mount(base, routes);
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self.launch();
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}
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@ -1,51 +1,85 @@
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use method::Method;
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use std::path::{Path, PathBuf, Component};
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use std::path::{PathBuf, Component};
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use std::collections::hash_map::HashMap;
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// FIXME: Split this up into multiple files: Collider, Route, Router, etc.
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// FIXME: Implement the following:
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// Collider<Route> for &str;
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trait Collider<T = Self> {
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fn collides_with(&self, other: &T) -> bool;
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}
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macro_rules! comp_to_str {
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($component:expr) => (
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match $component {
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&Component::Normal(ref comp) => {
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if let Some(string) = comp.to_str() { string }
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else { return true }
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},
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_ => return true
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};
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)
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}
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fn check_match_until(c: char, a: &str, b: &str, dir: bool) -> bool {
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let (a_len, b_len) = (a.len() as isize, b.len() as isize);
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let (mut i, mut j, delta) = if dir {
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(0, 0, 1)
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} else {
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(a_len - 1, b_len - 1, -1)
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};
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while i >= 0 && j >= 0 && i < a_len && j < b_len {
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let (c1, c2) = (a.char_at(i as usize), b.char_at(j as usize));
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if c1 == c || c2 == c {
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break;
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} else if c1 != c2 {
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return false;
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} else {
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i += delta;
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j += delta;
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}
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}
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return true;
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}
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impl<'a> Collider for Component<'a> {
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fn collides_with(&self, other: &Component<'a>) -> bool {
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let (a, b) = (comp_to_str!(self), comp_to_str!(other));
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check_match_until('<', a, b, true) && check_match_until('>', a, b, false)
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}
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}
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#[derive(Debug)]
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struct Route {
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method: Method,
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mount: &'static str,
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route: &'static str,
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n_components: usize,
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path: PathBuf
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}
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pub struct Router {
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paths: Vec<PathBuf> // for now, to check for collisions
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routes: Vec<Route> // for now, to check for collisions
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}
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fn is_variadic(c: &Component) -> bool {
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match c {
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&Component::Normal(ref comp) => comp.to_str().unwrap().starts_with("<"),
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_ => false
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}
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}
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impl Route {
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fn new(m: Method, mount: &'static str, route: &'static str) -> Route {
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let deduped_path = Route::dedup(mount, route);
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let path = PathBuf::from(deduped_path);
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#[inline]
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fn routes_collide(n: usize, a: &Path, b: &Path) -> bool {
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let mut matches = 0;
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let mut a_components = a.components();
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let mut b_components = b.components();
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while let Some(ref c1) = a_components.next() {
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if let Some(ref c2) = b_components.next() {
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if c1 == c2 {
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matches += 1;
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} else if is_variadic(c1) || is_variadic(c2) {
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matches += 1;
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}
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}
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}
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// println!("Checked {:?} against {:?}: {}/{}", a, b, matches, n);
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matches == n
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}
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// TODO: Are /hello and /hello/ the same? Or not? Currently, they're treated as
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// such by Path, which is passed on to the collisions stuff.
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impl Router {
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pub fn new() -> Router {
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Router {
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paths: Vec::new()
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Route {
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method: m,
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mount: mount,
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route: route,
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n_components: path.components().count(),
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path: path
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}
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}
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// TODO: Use `method` argument
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pub fn add_route(&mut self, _method: Method, base: &str, route: &str) {
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// Allocate enough space for the worst case.
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fn dedup(base: &'static str, route: &'static str) -> String {
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let mut deduped = String::with_capacity(base.len() + route.len() + 1);
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let mut last = '\0';
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@ -57,18 +91,54 @@ impl Router {
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last = c;
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}
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let path = PathBuf::from(deduped);
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println!("Mounted: {:?}", path);
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self.paths.push(path);
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deduped
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}
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}
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impl Collider for Route {
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fn collides_with(&self, b: &Route) -> bool {
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if self.n_components != b.n_components || self.method != b.method {
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return false;
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}
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let mut matches = 0;
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let mut a_components = self.path.components();
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let mut b_components = b.path.components();
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while let Some(ref c1) = a_components.next() {
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if let Some(ref c2) = b_components.next() {
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if c1.collides_with(c2) {
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matches += 1;
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}
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}
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}
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// println!("Checked {:?} against {:?}: {}/{}", a, b, matches, n);
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matches == self.n_components
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}
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}
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// TODO: Are /hello and /hello/ the same? Or not? Currently, they're treated as
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// such by Path, which is passed on to the collisions stuff.
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impl Router {
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pub fn new() -> Router {
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Router {
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routes: Vec::new()
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}
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}
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// TODO: Use `method` argument
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pub fn add_route(&mut self, method: Method, base: &'static str,
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route: &'static str) {
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let route = Route::new(method, base, route);
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println!("Mounted: {:?}", route);
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self.routes.push(route);
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}
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pub fn has_collisions(&self) -> bool {
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let mut map: HashMap<usize, Vec<&Path>> = HashMap::new();
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for route in &self.paths {
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let num_components = route.components().count();
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println!("Found {} for {:?}", num_components, route);
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let mut map: HashMap<usize, Vec<&Route>> = HashMap::new();
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for route in &self.routes {
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let num_components = route.path.components().count();
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let mut list = if map.contains_key(&num_components) {
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map.get_mut(&num_components).unwrap()
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} else {
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@ -76,18 +146,17 @@ impl Router {
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map.get_mut(&num_components).unwrap()
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};
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list.push(route.as_path());
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list.push(&route);
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}
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let mut result = false;
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for (num_components, routes) in map.iter() {
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for (_, routes) in map {
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for i in 0..routes.len() {
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for j in 0..routes.len() {
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if i == j { continue }
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let a_route = &routes[i];
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let b_route = &routes[j];
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if routes_collide(*num_components, a_route, b_route) {
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let (a_route, b_route) = (&routes[i], &routes[j]);
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if a_route.collides_with(b_route) {
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result = true;
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println!("{:?} and {:?} collide!", a_route, b_route);
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}
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@ -98,3 +167,85 @@ impl Router {
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result
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}
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}
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#[cfg(test)]
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mod tests {
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use super::{Route, Collider};
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use Method;
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use Method::*;
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fn m_collide(a: (Method, &'static str), b: (Method, &'static str)) -> bool {
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let route_a = Route::new(a.0, "/", a.1);
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route_a.collides_with(&Route::new(b.0, "/", b.1))
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}
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fn collide(a: &'static str, b: &'static str) -> bool {
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let route_a = Route::new(Get, "/", a);
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route_a.collides_with(&Route::new(Get, "/", b))
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}
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#[test]
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fn simple_collisions() {
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assert!(collide("a", "a"));
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assert!(collide("/a", "/a"));
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assert!(collide("/hello", "/hello"));
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assert!(collide("/hello", "/hello/"));
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assert!(collide("/hello/there/how/ar", "/hello/there/how/ar"));
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assert!(collide("/hello/there", "/hello/there/"));
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}
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#[test]
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fn simple_param_collisions() {
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assert!(collide("/hello/<name>", "/hello/<person>"));
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assert!(collide("/hello/<name>/hi", "/hello/<person>/hi"));
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assert!(collide("/hello/<name>/hi/there", "/hello/<person>/hi/there"));
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assert!(collide("/<name>/hi/there", "/<person>/hi/there"));
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assert!(collide("/<name>/hi/there", "/dude/<name>/there"));
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assert!(collide("/<name>/<a>/<b>", "/<a>/<b>/<c>"));
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assert!(collide("/<name>/<a>/<b>/", "/<a>/<b>/<c>/"));
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}
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#[test]
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fn medium_param_collisions() {
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assert!(collide("/hello/<name>", "/hello/bob"));
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assert!(collide("/<name>", "//bob"));
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}
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#[test]
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fn hard_param_collisions() {
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assert!(collide("/<name>bob", "/<name>b"));
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assert!(collide("/a<b>c", "/abc"));
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assert!(collide("/a<b>c", "/azooc"));
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assert!(collide("/a<b>", "/a"));
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assert!(collide("/<b>", "/a"));
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assert!(collide("/<a>/<b>", "/a/b<c>"));
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assert!(collide("/<a>/bc<b>", "/a/b<c>"));
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assert!(collide("/<a>/bc<b>d", "/a/b<c>"));
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}
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#[test]
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fn non_collisions() {
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assert!(!collide("/a", "/b"));
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assert!(!collide("/a/b", "/a"));
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assert!(!collide("/a/b", "/a/c"));
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assert!(!collide("/a/hello", "/a/c"));
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assert!(!collide("/hello", "/a/c"));
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assert!(!collide("/hello/there", "/hello/there/guy"));
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assert!(!collide("/b<a>/there", "/hi/there"));
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assert!(!collide("/<a>/<b>c", "/hi/person"));
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assert!(!collide("/<a>/<b>cd", "/hi/<a>e"));
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assert!(!collide("/a<a>/<b>", "/b<b>/<a>"));
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assert!(!collide("/a/<b>", "/b/<b>"));
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assert!(!collide("/a<a>/<b>", "/b/<b>"));
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}
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#[test]
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fn method_dependent_non_collisions() {
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assert!(!m_collide((Get, "/"), (Post, "/")));
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assert!(!m_collide((Post, "/"), (Put, "/")));
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assert!(!m_collide((Put, "/a"), (Put, "/")));
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assert!(!m_collide((Post, "/a"), (Put, "/")));
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assert!(!m_collide((Get, "/a"), (Put, "/")));
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assert!(!m_collide((Get, "/hello"), (Put, "/hello")));
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}
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}
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