Trait Entity 

pub trait Entity:
    'static
    + Send
    + Sync {
    type Error: 'static + Send + Sync;
    type Data: 'static + Send + Sync + Buf + From<Vec<u8>> + From<&'static [u8]>;

    // Required methods
    fn len(&self) -> u64;
    fn get_range(
        &self,
        range: Range<u64>,
    ) -> Box<dyn Stream<Item = Result<Self::Data, Self::Error>> + Send + Sync>;
    fn add_headers(&self, _: &mut HeaderMap);
    fn etag(&self) -> Option<HeaderValue>;
    fn last_modified(&self) -> Option<SystemTime>;

    // Provided method
    fn is_empty(&self) -> bool { ... }
}

A reusable, read-only, byte-rangeable HTTP entity for GET and HEAD serving. Must return exactly the same data on every call.

Required Associated Types

type Error: 'static + Send + Sync

type Data: 'static + Send + Sync + Buf + From<Vec<u8>> + From<&'static [u8]>

The type of a data chunk.

Commonly bytes::Bytes but may be something more exotic.

Required Methods

fn len(&self) -> u64

Returns the length of the entity’s body in bytes.

fn get_range( &self, range: Range<u64>, ) -> Box<dyn Stream<Item = Result<Self::Data, Self::Error>> + Send + Sync>

Gets the body bytes indicated by range.

fn add_headers(&self, _: &mut HeaderMap)

Adds entity headers such as Content-Type to the supplied Headers object. In particular, these headers are the “other representation header fields” described by RFC 7233 section 4.1; they should exclude Content-Range, Date, Cache-Control, ETag, Expires, Content-Location, and Vary.

This function will be called only when that section says that headers such as Content-Type should be included in the response.

fn etag(&self) -> Option<HeaderValue>

Returns an etag for this entity, if available. Implementations are encouraged to provide a strong etag. RFC 7232 section 2.1 notes that only strong etags are usable for sub-range retrieval.

fn last_modified(&self) -> Option<SystemTime>

Returns the last modified time of this entity, if available. Note that serve may serve an earlier Last-Modified: date than the one returned here if this time is in the future, as required by RFC 7232 section 2.2.1.

Provided Methods

fn is_empty(&self) -> bool

Returns true iff the entity’s body has length 0.

Implementors

impl<D, E> Entity for ChunkedReadFile<D, E>

where D: 'static + Send + Sync + Buf + From<Vec<u8>> + From<&'static [u8]>, E: 'static + Send + Sync + Into<Box<dyn StdError + Send + Sync>> + From<Box<dyn StdError + Send + Sync>>,

type Data = D

type Error = E