feat(headers): adds re-parsing ability when getting typed headers

BREAKING CHANGE: added requirement that all HeaderFormat implementations
  must also be fmt::Debug. This likely as easy as slapping
  #[derive(Debug)] on to any custom headers.

Cargo.toml

@@ -19,5 +19,4 @@ openssl = "*"
 rustc-serialize = "*"
 time = "*"
 unicase = "*"
-unsafe-any = "*"
 url = "*"

benches/client.rs

@@ -50,7 +50,7 @@ impl Write for MockStream {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 struct Foo;
 
 impl hyper::header::Header for Foo {

src/header/cell.rs

@@ -1,41 +0,0 @@
-use std::cell::UnsafeCell;
-use std::ops::Deref;
-
-pub struct OptCell<T>(UnsafeCell<Option<T>>);
-
-impl<T> OptCell<T> {
-    #[inline]
-    pub fn new(val: Option<T>) -> OptCell<T> {
-        OptCell(UnsafeCell::new(val))
-    }
-
-    #[inline]
-    pub fn set(&self, val: T) {
-        unsafe {
-            let opt = self.0.get();
-            debug_assert!((*opt).is_none());
-            *opt = Some(val)
-        }
-    }
-
-    #[inline]
-    pub unsafe fn get_mut(&mut self) -> &mut T {
-        let opt = &mut *self.0.get();
-        opt.as_mut().unwrap()
-    }
-}
-
-impl<T> Deref for OptCell<T> {
-    type Target = Option<T>;
-    #[inline]
-    fn deref<'a>(&'a self) -> &'a Option<T> {
-        unsafe { &*self.0.get() }
-    }
-}
-
-impl<T: Clone> Clone for OptCell<T> {
-    #[inline]
-    fn clone(&self) -> OptCell<T> {
-        OptCell::new((**self).clone())
-    }
-}

src/header/common/authorization.rs

@@ -54,7 +54,7 @@ impl<S: Scheme + 'static> HeaderFormat for Authorization<S> where <S as FromStr>
 }
 
 /// An Authorization scheme to be used in the header.
-pub trait Scheme: FromStr + Clone + Send + Sync {
+pub trait Scheme: FromStr + fmt::Debug + Clone + Send + Sync {
     /// An optional Scheme name.
     ///
     /// For example, `Basic asdf` has the name `Basic`. The Option<Self> is

src/header/internals/cell.rs

@@ -0,0 +1,131 @@
+use std::any::{Any, TypeId};
+use std::cell::UnsafeCell;
+use std::collections::HashMap;
+use std::fmt;
+use std::mem;
+use std::ops::Deref;
+
+pub struct OptCell<T>(UnsafeCell<Option<T>>);
+
+impl<T> OptCell<T> {
+    #[inline]
+    pub fn new(val: Option<T>) -> OptCell<T> {
+        OptCell(UnsafeCell::new(val))
+    }
+
+    #[inline]
+    pub fn set(&self, val: T) {
+        unsafe {
+            let opt = self.0.get();
+            debug_assert!((*opt).is_none());
+            *opt = Some(val)
+        }
+    }
+
+    #[inline]
+    pub unsafe fn get_mut(&mut self) -> &mut T {
+        let opt = &mut *self.0.get();
+        opt.as_mut().unwrap()
+    }
+}
+
+impl<T> Deref for OptCell<T> {
+    type Target = Option<T>;
+    #[inline]
+    fn deref<'a>(&'a self) -> &'a Option<T> {
+        unsafe { &*self.0.get() }
+    }
+}
+
+impl<T: Clone> Clone for OptCell<T> {
+    #[inline]
+    fn clone(&self) -> OptCell<T> {
+        OptCell::new((**self).clone())
+    }
+}
+
+pub struct PtrMapCell<V: ?Sized>(UnsafeCell<PtrMap<Box<V>>>);
+
+#[derive(Clone, Debug)]
+enum PtrMap<T> {
+    Empty,
+    One(TypeId, T),
+    Many(HashMap<TypeId, T>)
+}
+
+impl<V: ?Sized + fmt::Debug + Any + 'static> PtrMapCell<V> {
+    #[inline]
+    pub fn new() -> PtrMapCell<V> {
+        PtrMapCell(UnsafeCell::new(PtrMap::Empty))
+    }
+
+    #[inline]
+    pub fn get(&self, key: TypeId) -> Option<&V> {
+        let map = unsafe { &*self.0.get() };
+        match *map {
+            PtrMap::Empty => None,
+            PtrMap::One(id, ref v) => if id == key {
+                Some(v)
+            } else {
+                None
+            },
+            PtrMap::Many(ref hm) => hm.get(&key)
+        }.map(|val| &**val)
+    }
+
+    #[inline]
+    pub fn get_mut(&mut self, key: TypeId) -> Option<&mut V> {
+        let mut map = unsafe { &mut *self.0.get() };
+        match *map {
+            PtrMap::Empty => None,
+            PtrMap::One(id, ref mut v) => if id == key {
+                Some(v)
+            } else {
+                None
+            },
+            PtrMap::Many(ref mut hm) => hm.get_mut(&key)
+        }.map(|val| &mut **val)
+    }
+
+    #[inline]
+    pub unsafe fn insert(&self, key: TypeId, val: Box<V>) {
+        let mut map = &mut *self.0.get();
+        match *map {
+            PtrMap::Empty => *map = PtrMap::One(key, val),
+            PtrMap::One(..) => {
+                let one = mem::replace(map, PtrMap::Empty);
+                match one {
+                    PtrMap::One(id, one) => {
+                        debug_assert!(id != key);
+                        let mut hm = HashMap::with_capacity(2);
+                        hm.insert(id, one);
+                        hm.insert(key, val);
+                        mem::replace(map, PtrMap::Many(hm));
+                    },
+                    _ => unreachable!()
+                }
+            },
+            PtrMap::Many(ref mut hm) => { hm.insert(key, val); }
+        }
+    }
+
+    #[inline]
+    pub unsafe fn one(&self) -> &V {
+        let map = &*self.0.get();
+        match *map {
+            PtrMap::One(_, ref one) => one,
+            _ => panic!("not PtrMap::One value, {:?}", *map)
+        }
+    }
+}
+
+impl<V: ?Sized + fmt::Debug + Any + 'static> Clone for PtrMapCell<V> where Box<V>: Clone {
+    #[inline]
+    fn clone(&self) -> PtrMapCell<V> {
+        let cell = PtrMapCell::new();
+        unsafe {
+            *cell.0.get() = (&*self.0.get()).clone()
+        }
+        cell
+    }
+}

src/header/internals/item.rs

@@ -0,0 +1,107 @@
+use std::any::TypeId;
+use std::fmt;
+use std::str::from_utf8;
+
+use super::cell::{OptCell, PtrMapCell};
+use header::{Header, HeaderFormat};
+
+
+#[derive(Clone)]
+pub struct Item {
+    raw: OptCell<Vec<Vec<u8>>>,
+    typed: PtrMapCell<HeaderFormat + Send + Sync>
+}
+
+impl Item {
+    #[inline]
+    pub fn new_raw(data: Vec<Vec<u8>>) -> Item {
+        Item {
+            raw: OptCell::new(Some(data)),
+            typed: PtrMapCell::new(),
+        }
+    }
+
+    #[inline]
+    pub fn new_typed(ty: Box<HeaderFormat + Send + Sync>) -> Item {
+        let map = PtrMapCell::new();
+        unsafe { map.insert((&*ty).get_type_id(), ty); }
+        Item {
+            raw: OptCell::new(None),
+            typed: map,
+        }
+    }
+
+    #[inline]
+    pub fn mut_raw(&mut self) -> &mut Vec<Vec<u8>> {
+        self.typed = PtrMapCell::new();
+        unsafe {
+            self.raw.get_mut()
+        }
+    }
+
+    pub fn raw(&self) -> &[Vec<u8>] {
+        if let Some(ref raw) = *self.raw {
+            return &raw[..];
+        }
+
+        let raw = vec![unsafe { self.typed.one() }.to_string().into_bytes()];
+        self.raw.set(raw);
+
+        let raw = self.raw.as_ref().unwrap();
+        &raw[..]
+    }
+
+    pub fn typed<H: Header + HeaderFormat>(&self) -> Option<&H> {
+        let tid = TypeId::of::<H>();
+        match self.typed.get(tid) {
+            Some(val) => Some(val),
+            None => {
+                match parse::<H>(self.raw.as_ref().expect("item.raw must exist")) {
+                    Some(typed) => {
+                        unsafe { self.typed.insert(tid, typed); }
+                        self.typed.get(tid)
+                    },
+                    None => None
+                }
+            }
+        }.map(|typed| unsafe { typed.downcast_ref_unchecked() })
+    }
+
+    pub fn typed_mut<H: Header + HeaderFormat>(&mut self) -> Option<&mut H> {
+        let tid = TypeId::of::<H>();
+        if self.typed.get_mut(tid).is_none() {
+            match parse::<H>(self.raw.as_ref().expect("item.raw must exist")) {
+                Some(typed) => {
+                    unsafe { self.typed.insert(tid, typed); }
+                },
+                None => ()
+            }
+        }
+        self.typed.get_mut(tid).map(|typed| unsafe { typed.downcast_mut_unchecked() })
+    }
+}
+
+#[inline]
+fn parse<H: Header + HeaderFormat>(raw: &Vec<Vec<u8>>) -> Option<Box<HeaderFormat + Send + Sync>> {
+    Header::parse_header(&raw[..]).map(|h: H| box h as Box<HeaderFormat + Send + Sync>)
+}
+
+impl fmt::Display for Item {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match *self.raw {
+            Some(ref raw) => {
+                for part in raw.iter() {
+                    match from_utf8(&part[..]) {
+                        Ok(s) => try!(fmt.write_str(s)),
+                        Err(e) => {
+                            error!("raw header value is not utf8. header={:?}, error={:?}", part, e);
+                            return Err(fmt::Error);
+                        }
+                    }
+                }
+                Ok(())
+            },
+            None => fmt::Display::fmt(&unsafe { self.typed.one() }, fmt)
+        }
+    }
+}

src/header/internals/mod.rs

@@ -0,0 +1,4 @@
+pub use self::item::Item;
+
+mod cell;
+mod item;

src/header/mod.rs

@@ -4,29 +4,27 @@
 //! why we're using Rust in the first place. To set or get any header, an object
 //! must implement the `Header` trait from this module. Several common headers
 //! are already provided, such as `Host`, `ContentType`, `UserAgent`, and others.
-use std::any::{Any, TypeId};
+use std::any::Any;
 use std::borrow::Cow::{Borrowed, Owned};
 use std::fmt;
 use std::io::Read;
 use std::raw::TraitObject;
-use std::str::from_utf8;
 use std::collections::HashMap;
 use std::collections::hash_map::{Iter, Entry};
 use std::iter::{FromIterator, IntoIterator};
 use std::borrow::{Cow, IntoCow};
 use std::{mem, raw};
 
-use uany::{UnsafeAnyExt};
 use unicase::UniCase;
 
-use self::cell::OptCell;
+use self::internals::Item;
 use {http, HttpResult, HttpError};
 
 pub use self::shared::{Encoding, EntityTag, Quality, QualityItem, qitem};
 pub use self::common::*;
 
-mod cell;
 mod common;
+mod internals;
 mod shared;
 pub mod parsing;
 
@@ -55,7 +53,7 @@ pub trait Header: Clone + Any + Send + Sync {
 /// A trait for any object that will represent a header field and value.
 ///
 /// This trait represents the formatting of a Header for output to a TcpStream.
-pub trait HeaderFormat: HeaderClone + Any + Send + Sync {
+pub trait HeaderFormat: fmt::Debug + HeaderClone + Any + Send + Sync {
     /// Format a header to be output into a TcpStream.
     ///
     /// This method is not allowed to introduce an Err not produced
@@ -77,13 +75,6 @@ impl<T: HeaderFormat + Send + Sync + Clone> HeaderClone for T {
 }
 
 impl HeaderFormat {
-    #[inline]
-    fn is<T: 'static>(&self) -> bool {
-        self.get_type_id() == TypeId::of::<T>()
-    }
-}
-
-impl UnsafeAnyExt for HeaderFormat {
     #[inline]
     unsafe fn downcast_ref_unchecked<T: 'static>(&self) -> &T {
         mem::transmute(mem::transmute::<&HeaderFormat, raw::TraitObject>(self).data)
@@ -93,11 +84,6 @@ impl UnsafeAnyExt for HeaderFormat {
     unsafe fn downcast_mut_unchecked<T: 'static>(&mut self) -> &mut T {
         mem::transmute(mem::transmute::<&mut HeaderFormat, raw::TraitObject>(self).data)
     }
-
-    #[inline]
-    unsafe fn downcast_unchecked<T: 'static>(self: Box<HeaderFormat>) -> Box<T> {
-        mem::transmute(mem::transmute::<Box<HeaderFormat>, raw::TraitObject>(self).data)
-    }
 }
 
 impl Clone for Box<HeaderFormat + Send + Sync> {
@@ -179,19 +165,8 @@ impl Headers {
     /// ```
     pub fn get_raw(&self, name: &str) -> Option<&[Vec<u8>]> {
         self.data
-            // FIXME(reem): Find a better way to do this lookup without find_equiv.
             .get(&UniCase(Borrowed(unsafe { mem::transmute::<&str, &str>(name) })))
-            .and_then(|item| {
+            .map(Item::raw)
-                if let Some(ref raw) = *item.raw {
-                    return Some(&raw[..]);
-                }
-
-                let raw = vec![item.typed.as_ref().unwrap().to_string().into_bytes()];
-                item.raw.set(raw);
-
-                let raw = item.raw.as_ref().unwrap();
-                Some(&raw[..])
-            })
     }
 
     /// Set the raw value of a header, bypassing any typed headers.
@@ -214,26 +189,12 @@ impl Headers {
 
     /// Get a reference to the header field's value, if it exists.
     pub fn get<H: Header + HeaderFormat>(&self) -> Option<&H> {
-        self.get_or_parse::<H>().map(|item| {
+        self.data.get(&UniCase(Borrowed(header_name::<H>()))).and_then(Item::typed::<H>)
-            unsafe {
-                downcast(&*item)
-            }
-        })
     }
 
     /// Get a mutable reference to the header field's value, if it exists.
     pub fn get_mut<H: Header + HeaderFormat>(&mut self) -> Option<&mut H> {
-        self.get_or_parse_mut::<H>().map(|item| {
+        self.data.get_mut(&UniCase(Borrowed(header_name::<H>()))).and_then(Item::typed_mut::<H>)
-            unsafe { downcast_mut(item) }
-        })
-    }
-
-    fn get_or_parse<H: Header + HeaderFormat>(&self) -> Option<&Item> {
-        self.data.get(&UniCase(Borrowed(header_name::<H>()))).and_then(get_or_parse::<H>)
-    }
-
-    fn get_or_parse_mut<H: Header + HeaderFormat>(&mut self) -> Option<&mut Item> {
-        self.data.get_mut(&UniCase(Borrowed(header_name::<H>()))).and_then(get_or_parse_mut::<H>)
     }
 
     /// Returns a boolean of whether a certain header is in the map.
@@ -329,11 +290,7 @@ impl<'a> HeaderView<'a> {
     /// Cast the value to a certain Header type.
     #[inline]
     pub fn value<H: Header + HeaderFormat>(&self) -> Option<&'a H> {
-        get_or_parse::<H>(self.1).map(|item| {
+        self.1.typed::<H>()
-            unsafe {
-                downcast(&*item)
-            }
-        })
     }
 
     /// Get just the header value as a String.
@@ -371,141 +328,7 @@ impl<'a> FromIterator<HeaderView<'a>> for Headers {
     }
 }
 
-#[derive(Clone)]
+impl<'a> fmt::Display for &'a (HeaderFormat + Send + Sync) {
-struct Item {
-    raw: OptCell<Vec<Vec<u8>>>,
-    typed: OptCell<Box<HeaderFormat + Send + Sync>>
-}
-
-impl Item {
-    #[inline]
-    fn new_raw(data: Vec<Vec<u8>>) -> Item {
-        Item {
-            raw: OptCell::new(Some(data)),
-            typed: OptCell::new(None),
-        }
-    }
-
-    #[inline]
-    fn new_typed(ty: Box<HeaderFormat + Send + Sync>) -> Item {
-        Item {
-            raw: OptCell::new(None),
-            typed: OptCell::new(Some(ty)),
-        }
-    }
-
-    #[inline]
-    fn mut_raw(&mut self) -> &mut Vec<Vec<u8>> {
-        self.typed = OptCell::new(None);
-        unsafe {
-            self.raw.get_mut()
-        }
-    }
-
-    #[inline]
-    fn mut_typed(&mut self) -> &mut Box<HeaderFormat + Send + Sync> {
-        self.raw = OptCell::new(None);
-        unsafe {
-            self.typed.get_mut()
-        }
-    }
-}
-
-
-fn get_or_parse<H: Header + HeaderFormat>(item: &Item) -> Option<&Item> {
-    match *item.typed {
-        Some(ref typed) if typed.is::<H>() => return Some(item),
-        Some(ref typed) => {
-            warn!("attempted to access {:?} as wrong type", typed);
-            return None;
-        }
-        _ => ()
-    }
-
-    parse::<H>(item);
-    if item.typed.is_some() {
-        Some(item)
-    } else {
-        None
-    }
-}
-
-fn get_or_parse_mut<H: Header + HeaderFormat>(item: &mut Item) -> Option<&mut Item> {
-    let is_correct_type = match *item.typed {
-        Some(ref typed) if typed.is::<H>() => Some(true),
-        Some(ref typed) => {
-            warn!("attempted to access {:?} as wrong type", typed);
-            Some(false)
-        }
-        _ => None
-    };
-
-    match is_correct_type {
-        Some(true) => return Some(item),
-        Some(false) => return None,
-        None => ()
-    }
-
-    parse::<H>(&item);
-    if item.typed.is_some() {
-        Some(item)
-    } else {
-        None
-    }
-}
-
-fn parse<H: Header + HeaderFormat>(item: &Item) {
-    match *item.raw {
-        Some(ref raw) => match Header::parse_header(&raw[..]) {
-            Some::<H>(h) => item.typed.set(box h as Box<HeaderFormat + Send + Sync>),
-            None => ()
-        },
-        None => unreachable!()
-    }
-}
-
-#[inline]
-unsafe fn downcast<H: Header + HeaderFormat>(item: &Item) -> &H {
-    item.typed.as_ref().expect("item.typed must be set").downcast_ref_unchecked()
-}
-
-#[inline]
-unsafe fn downcast_mut<H: Header + HeaderFormat>(item: &mut Item) -> &mut H {
-    item.mut_typed().downcast_mut_unchecked()
-}
-
-impl fmt::Display for Item {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        match *self.typed {
-            Some(ref h) => h.fmt_header(fmt),
-            None => match *self.raw {
-                Some(ref raw) => {
-                    for part in raw.iter() {
-                        match from_utf8(&part[..]) {
-                            Ok(s) => try!(fmt.write_str(s)),
-                            Err(e) => {
-                                error!("raw header value is not utf8. header={:?}, error={:?}", part, e);
-                                return Err(fmt::Error);
-                            }
-                        }
-                    }
-                    Ok(())
-                },
-                None => unreachable!()
-            }
-        }
-    }
-}
-
-
-impl fmt::Debug for Box<HeaderFormat + Send + Sync> {
-    #[inline]
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        (**self).fmt_header(fmt)
-    }
-}
-
-impl fmt::Display for Box<HeaderFormat + Send + Sync> {
     #[inline]
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         (**self).fmt_header(fmt)
@@ -568,7 +391,7 @@ mod tests {
         assert_eq!(accept, Some(Accept(vec![application_vendor, text_plain])));
     }
 
-    #[derive(Clone, Debug)]
+    #[derive(Clone, PartialEq, Debug)]
     struct CrazyLength(Option<bool>, usize);
 
     impl Header for CrazyLength {
@@ -600,15 +423,14 @@ mod tests {
     #[test]
     fn test_different_structs_for_same_header() {
         let headers = Headers::from_raw(&mut b"Content-Length: 10\r\n\r\n").unwrap();
-        let ContentLength(_) = *headers.get::<ContentLength>().unwrap();
+        assert_eq!(headers.get::<ContentLength>(), Some(&ContentLength(10)));
-        assert!(headers.get::<CrazyLength>().is_none());
+        assert_eq!(headers.get::<CrazyLength>(), Some(&CrazyLength(Some(false), 10)));
     }
 
     #[test]
     fn test_trailing_whitespace() {
         let headers = Headers::from_raw(&mut b"Content-Length: 10   \r\n\r\n").unwrap();
-        let ContentLength(_) = *headers.get::<ContentLength>().unwrap();
+        assert_eq!(headers.get::<ContentLength>(), Some(&ContentLength(10)));
-        assert!(headers.get::<CrazyLength>().is_none());
     }
 
     #[test]

src/lib.rs

@@ -130,7 +130,6 @@ extern crate "rustc-serialize" as serialize;
 extern crate time;
 extern crate url;
 extern crate openssl;
-extern crate "unsafe-any" as uany;
 extern crate cookie;
 extern crate unicase;
 

src/net.rs

@@ -8,7 +8,6 @@ use std::path::Path;
 use std::raw::{self, TraitObject};
 use std::sync::Arc;
 
-use uany::UnsafeAnyExt;
 use openssl::ssl::{Ssl, SslStream, SslContext};
 use openssl::ssl::SslVerifyMode::SslVerifyNone;
 use openssl::ssl::SslMethod::Sslv23;
@@ -99,7 +98,7 @@ impl Clone for Box<NetworkStream + Send> {
     fn clone(&self) -> Box<NetworkStream + Send> { self.clone_box() }
 }
 
-impl UnsafeAnyExt for NetworkStream {
+impl NetworkStream {
     unsafe fn downcast_ref_unchecked<T: 'static>(&self) -> &T {
         mem::transmute(mem::transmute::<&NetworkStream,
                                         raw::TraitObject>(self).data)
@@ -351,8 +350,6 @@ fn lift_ssl_error(ssl: SslError) -> io::Error {
 
 #[cfg(test)]
 mod tests {
-    use uany::UnsafeAnyExt;
-
     use mock::MockStream;
     use super::NetworkStream;