progress

Author: yoshuawuyts

src/cache/cache_control.rs

@@ -0,0 +1,194 @@
+use crate::cache::CacheDirective;
+use crate::headers::{HeaderName, HeaderValue, Headers, ToHeaderValues, CACHE_CONTROL};
+
+use std::fmt::{self, Debug, Write};
+use std::iter::Iterator;
+use std::option;
+use std::slice;
+
+/// A Cache-Control header.
+pub struct CacheControl {
+    entries: Vec<CacheDirective>,
+}
+
+impl CacheControl {
+    /// Create a new instance of `ServerTiming`.
+    pub fn new() -> Self {
+        Self { entries: vec![] }
+    }
+
+    /// Create a new instance from headers.
+    pub fn from_headers(headers: impl AsRef<Headers>) -> crate::Result<Option<Self>> {
+        let mut entries = vec![];
+        let headers = match headers.as_ref().get(CACHE_CONTROL) {
+            Some(headers) => headers,
+            None => return Ok(None),
+        };
+
+        for value in headers {
+            for part in value.as_str().trim().split(',') {
+                // Try and parse a directive from a str. If the directive is
+                // unkown we skip it.
+                if let Some(entry) = CacheDirective::from_str(part.trim_start())? {
+                    entries.push(entry);
+                }
+            }
+        }
+        Ok(Some(Self { entries }))
+    }
+
+    /// Sets the `Server-Timing` header.
+    pub fn apply(&self, mut headers: impl AsMut<Headers>) {
+        headers.as_mut().insert(CACHE_CONTROL, self.value());
+    }
+
+    /// Get the `HeaderName`.
+    pub fn name(&self) -> HeaderName {
+        CACHE_CONTROL
+    }
+
+    /// Get the `HeaderValue`.
+    pub fn value(&self) -> HeaderValue {
+        let mut output = String::new();
+        for (n, timing) in self.entries.iter().enumerate() {
+            let timing: HeaderValue = timing.clone().into();
+            match n {
+                0 => write!(output, "{}", timing).unwrap(),
+                _ => write!(output, ", {}", timing).unwrap(),
+            };
+        }
+
+        // SAFETY: the internal string is validated to be ASCII.
+        unsafe { HeaderValue::from_bytes_unchecked(output.into()) }
+    }
+    /// Push a directive into the list of entries.
+    pub fn push(&mut self, directive: CacheDirective) {
+        self.entries.push(directive);
+    }
+
+    /// An iterator visiting all server entries.
+    pub fn into_iter(self) -> IntoIter {
+        IntoIter {
+            inner: self.entries.into_iter(),
+        }
+    }
+
+    /// An iterator visiting all server entries.
+    pub fn iter(&self) -> Iter<'_> {
+        Iter {
+            inner: self.entries.iter(),
+        }
+    }
+
+    /// An iterator visiting all server entries.
+    pub fn iter_mut(&mut self) -> IterMut<'_> {
+        IterMut {
+            inner: self.entries.iter_mut(),
+        }
+    }
+}
+
+impl IntoIterator for CacheControl {
+    type Item = CacheDirective;
+    type IntoIter = IntoIter;
+
+    #[inline]
+    fn into_iter(self) -> Self::IntoIter {
+        self.into_iter()
+    }
+}
+
+impl<'a> IntoIterator for &'a CacheControl {
+    type Item = &'a CacheDirective;
+    type IntoIter = Iter<'a>;
+
+    // #[inline]serv
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter()
+    }
+}
+
+impl<'a> IntoIterator for &'a mut CacheControl {
+    type Item = &'a mut CacheDirective;
+    type IntoIter = IterMut<'a>;
+
+    #[inline]
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter_mut()
+    }
+}
+
+/// A borrowing iterator over entries in `CacheControl`.
+#[derive(Debug)]
+pub struct IntoIter {
+    inner: std::vec::IntoIter<CacheDirective>,
+}
+
+impl Iterator for IntoIter {
+    type Item = CacheDirective;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+}
+
+/// A lending iterator over entries in `CacheControl`.
+#[derive(Debug)]
+pub struct Iter<'a> {
+    inner: slice::Iter<'a, CacheDirective>,
+}
+
+impl<'a> Iterator for Iter<'a> {
+    type Item = &'a CacheDirective;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+}
+
+/// A mutable iterator over entries in `CacheControl`.
+#[derive(Debug)]
+pub struct IterMut<'a> {
+    inner: slice::IterMut<'a, CacheDirective>,
+}
+
+impl<'a> Iterator for IterMut<'a> {
+    type Item = &'a mut CacheDirective;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+}
+
+impl ToHeaderValues for CacheControl {
+    type Iter = option::IntoIter<HeaderValue>;
+    fn to_header_values(&self) -> crate::Result<Self::Iter> {
+        // A HeaderValue will always convert into itself.
+        Ok(self.value().to_header_values().unwrap())
+    }
+}
+
+impl Debug for CacheControl {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut list = f.debug_list();
+        for directive in &self.entries {
+            list.entry(directive);
+        }
+        list.finish()
+    }
+}