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use std::fs::File;
use std::fmt;
use std::io::{self, Cursor, Read};
use bytes::Bytes;
use futures::Future;
use hyper::{self};
use {async_impl};
/// The body of a `Request`.
///
/// In most cases, this is not needed directly, as the
/// [`RequestBuilder.body`][builder] method uses `Into<Body>`, which allows
/// passing many things (like a string or vector of bytes).
///
/// [builder]: ./struct.RequestBuilder.html#method.body
#[derive(Debug)]
pub struct Body {
kind: Kind,
}
impl Body {
/// Instantiate a `Body` from a reader.
///
/// # Note
///
/// While allowing for many types to be used, these bodies do not have
/// a way to reset to the beginning and be reused. This means that when
/// encountering a 307 or 308 status code, instead of repeating the
/// request at the new location, the `Response` will be returned with
/// the redirect status code set.
///
/// ```rust
/// # use std::fs::File;
/// # use reqwest::Body;
/// # fn run() -> Result<(), Box<std::error::Error>> {
/// let file = File::open("national_secrets.txt")?;
/// let body = Body::new(file);
/// # Ok(())
/// # }
/// ```
///
/// If you have a set of bytes, like `String` or `Vec<u8>`, using the
/// `From` implementations for `Body` will store the data in a manner
/// it can be reused.
///
/// ```rust
/// # use reqwest::Body;
/// # fn run() -> Result<(), Box<std::error::Error>> {
/// let s = "A stringy body";
/// let body = Body::from(s);
/// # Ok(())
/// # }
/// ```
pub fn new<R: Read + Send + 'static>(reader: R) -> Body {
Body {
kind: Kind::Reader(Box::from(reader), None),
}
}
/// Create a `Body` from a `Read` where the size is known in advance
/// but the data should not be fully loaded into memory. This will
/// set the `Content-Length` header and stream from the `Read`.
///
/// ```rust
/// # use std::fs::File;
/// # use reqwest::Body;
/// # fn run() -> Result<(), Box<std::error::Error>> {
/// let file = File::open("a_large_file.txt")?;
/// let file_size = file.metadata()?.len();
/// let body = Body::sized(file, file_size);
/// # Ok(())
/// # }
/// ```
pub fn sized<R: Read + Send + 'static>(reader: R, len: u64) -> Body {
Body {
kind: Kind::Reader(Box::from(reader), Some(len)),
}
}
pub(crate) fn len(&self) -> Option<u64> {
match self.kind {
Kind::Reader(_, len) => len,
Kind::Bytes(ref bytes) => Some(bytes.len() as u64),
}
}
pub(crate) fn into_reader(self) -> Reader {
match self.kind {
Kind::Reader(r, _) => Reader::Reader(r),
Kind::Bytes(b) => Reader::Bytes(Cursor::new(b)),
}
}
pub(crate) fn into_async(self) -> (Option<Sender>, async_impl::Body, Option<u64>) {
match self.kind {
Kind::Reader(read, len) => {
let (tx, rx) = hyper::Body::channel();
let tx = Sender {
body: (read, len),
tx: tx,
};
(Some(tx), async_impl::Body::wrap(rx), len)
},
Kind::Bytes(chunk) => {
let len = chunk.len() as u64;
(None, async_impl::Body::reusable(chunk), Some(len))
}
}
}
pub(crate) fn try_clone(&self) -> Option<Body> {
self.kind.try_clone()
.map(|kind| Body { kind })
}
}
enum Kind {
Reader(Box<Read + Send>, Option<u64>),
Bytes(Bytes),
}
impl Kind {
fn try_clone(&self) -> Option<Kind> {
match self {
Kind::Reader(..) => None,
Kind::Bytes(v) => Some(Kind::Bytes(v.clone())),
}
}
}
impl From<Vec<u8>> for Body {
#[inline]
fn from(v: Vec<u8>) -> Body {
Body {
kind: Kind::Bytes(v.into()),
}
}
}
impl From<String> for Body {
#[inline]
fn from(s: String) -> Body {
s.into_bytes().into()
}
}
impl From<&'static [u8]> for Body {
#[inline]
fn from(s: &'static [u8]) -> Body {
Body {
kind: Kind::Bytes(Bytes::from_static(s)),
}
}
}
impl From<&'static str> for Body {
#[inline]
fn from(s: &'static str) -> Body {
s.as_bytes().into()
}
}
impl From<File> for Body {
#[inline]
fn from(f: File) -> Body {
let len = f.metadata().map(|m| m.len()).ok();
Body {
kind: Kind::Reader(Box::new(f), len),
}
}
}
impl fmt::Debug for Kind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Kind::Reader(_, ref v) => f.debug_struct("Reader")
.field("length", &DebugLength(v))
.finish(),
Kind::Bytes(ref v) => fmt::Debug::fmt(v, f),
}
}
}
struct DebugLength<'a>(&'a Option<u64>);
impl<'a> fmt::Debug for DebugLength<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self.0 {
Some(ref len) => fmt::Debug::fmt(len, f),
None => f.write_str("Unknown"),
}
}
}
pub(crate) enum Reader {
Reader(Box<Read + Send>),
Bytes(Cursor<Bytes>),
}
impl Read for Reader {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
match *self {
Reader::Reader(ref mut rdr) => rdr.read(buf),
Reader::Bytes(ref mut rdr) => rdr.read(buf),
}
}
}
pub(crate) struct Sender {
body: (Box<Read + Send>, Option<u64>),
tx: hyper::body::Sender,
}
impl Sender {
// A `Future` that may do blocking read calls.
// As a `Future`, this integrates easily with `wait::timeout`.
pub(crate) fn send(self) -> impl Future<Item=(), Error=::Error> {
use std::cmp;
use bytes::{BufMut, BytesMut};
use futures::future;
let con_len = self.body.1;
let cap = cmp::min(self.body.1.unwrap_or(8192), 8192);
let mut written = 0;
let mut buf = BytesMut::with_capacity(cap as usize);
let mut body = self.body.0;
// Put in an option so that it can be consumed on error to call abort()
let mut tx = Some(self.tx);
future::poll_fn(move || loop {
if Some(written) == con_len {
// Written up to content-length, so stop.
return Ok(().into());
}
try_ready!(tx
.as_mut()
.expect("tx only taken on error")
.poll_ready()
.map_err(::error::from));
if buf.remaining_mut() == 0 {
buf.reserve(8192);
}
match body.read(unsafe { buf.bytes_mut() }) {
Ok(0) => {
return Ok(().into())
},
Ok(n) => {
unsafe { buf.advance_mut(n); }
written += n as u64;
let tx = tx.as_mut().expect("tx only taken on error");
if let Err(_) = tx.send_data(buf.take().freeze().into()) {
return Err(::error::timedout(None));
}
}
Err(e) => {
let ret = io::Error::new(e.kind(), e.to_string());
tx
.take()
.expect("tx only taken on error")
.abort();
return Err(::error::from(ret));
}
}
})
}
}
// useful for tests, but not publicly exposed
#[cfg(test)]
pub(crate) fn read_to_string(mut body: Body) -> io::Result<String> {
let mut s = String::new();
match body.kind {
Kind::Reader(ref mut reader, _) => reader.read_to_string(&mut s),
Kind::Bytes(ref mut bytes) => (&**bytes).read_to_string(&mut s),
}
.map(|_| s)
}