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redirect and error reform

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- `Error` has been made an opaque struct.
- `RedirectPolicy` now makes use of `RedirectAttempt` and `RedirectAction`.
This commit is contained in:
Sean McArthur
2017-05-05 09:59:12 -07:00
parent b0ef498f77
commit d514d4e6e8
6 changed files with 284 additions and 103 deletions
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28
src/client.rs
View File

@@ -16,7 +16,7 @@ use serde_json;
use serde_urlencoded;
use ::body::{self, Body};
use ::redirect::{RedirectPolicy, check_redirect};
use ::redirect::{self, RedirectPolicy, check_redirect};
use ::response::Response;
static DEFAULT_USER_AGENT: &'static str = concat!(env!("CARGO_PKG_NAME"), "/", env!("CARGO_PKG_VERSION"));
@@ -36,7 +36,7 @@ pub struct Client {
impl Client {
/// Constructs a new `Client`.
pub fn new() -> ::Result<Client> {
let mut client = try!(new_hyper_client());
let mut client = try_!(new_hyper_client());
client.set_redirect_policy(::hyper::client::RedirectPolicy::FollowNone);
Ok(Client {
inner: Arc::new(ClientRef {
@@ -133,7 +133,7 @@ fn new_hyper_client() -> ::Result<::hyper::Client> {
::hyper::client::Pool::with_connector(
Default::default(),
::hyper::net::HttpsConnector::new(
try!(NativeTlsClient::new()
try_!(NativeTlsClient::new()
.map_err(|e| ::hyper::Error::Ssl(Box::new(e)))))
)
))
@@ -198,7 +198,7 @@ impl RequestBuilder {
/// .send();
/// ```
pub fn form<T: Serialize>(mut self, form: &T) -> RequestBuilder {
let body = serde_urlencoded::to_string(form).map_err(::Error::from);
let body = serde_urlencoded::to_string(form).map_err(::error::from);
self.headers.set(ContentType::form_url_encoded());
self.body = Some(body.map(|b| b.into()));
self
@@ -242,10 +242,10 @@ impl RequestBuilder {
}
let client = self.client;
let mut method = self.method;
let mut url = try!(self.url);
let mut url = try_!(self.url);
let mut headers = self.headers;
let mut body = match self.body {
Some(b) => Some(try!(b)),
Some(b) => Some(try_!(b)),
None => None,
};
@@ -263,7 +263,7 @@ impl RequestBuilder {
req = req.body(body);
}
try!(req.send())
try_!(req.send(), &url)
};
let should_redirect = match res.status {
@@ -304,12 +304,20 @@ impl RequestBuilder {
Ok(loc) => {
headers.set(Referer(url.to_string()));
urls.push(url);
if check_redirect(&client.redirect_policy.lock().unwrap(), &loc, &urls)? {
loc
} else {
let action = check_redirect(&client.redirect_policy.lock().unwrap(), &loc, &urls);
match action {
redirect::Action::Follow => loc,
redirect::Action::Stop => {
debug!("redirect_policy disallowed redirection to '{}'", loc);
return Ok(::response::new(res, client.auto_ungzip.load(Ordering::Relaxed)));
},
redirect::Action::LoopDetected => {
return Err(::error::loop_detected(res.url.clone()));
},
redirect::Action::TooManyRedirects => {
return Err(::error::too_many_redirects(res.url.clone()));
}
}
},
Err(e) => {

204
src/error.rs
View File

@@ -1,87 +1,191 @@
use std::error::Error as StdError;
use std::fmt;
use ::Url;
/// The Errors that may occur when processing a `Request`.
#[derive(Debug)]
pub enum Error {
/// An HTTP error from the `hyper` crate.
Http(::hyper::Error),
/// An error trying to serialize a value.
///
/// This may be serializing a value that is illegal in JSON or
/// form-url-encoded bodies.
Serialize(Box<StdError + Send + Sync>),
/// A request tried to redirect too many times.
TooManyRedirects,
/// An infinite redirect loop was detected.
RedirectLoop,
#[doc(hidden)]
__DontMatchMe,
pub struct Error {
kind: Kind,
url: Option<Url>,
}
/// A `Result` alias where the `Err` case is `reqwest::Error`.
pub type Result<T> = ::std::result::Result<T, Error>;
impl Error {
/// Returns a possible URL related to this error.
#[inline]
pub fn url(&self) -> Option<&Url> {
self.url.as_ref()
}
/// Returns true if the error is related to HTTP.
#[inline]
pub fn is_http(&self) -> bool {
match self.kind {
Kind::Http(_) => true,
_ => false,
}
}
/// Returns true if the error is serialization related.
#[inline]
pub fn is_serialization(&self) -> bool {
match self.kind {
Kind::Json(_) |
Kind::UrlEncoded(_) => true,
_ => false,
}
}
/// Returns true if the error is from a `RedirectPolicy`.
#[inline]
pub fn is_redirect(&self) -> bool {
match self.kind {
Kind::TooManyRedirects |
Kind::RedirectLoop => true,
_ => false,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::Http(ref e) => fmt::Display::fmt(e, f),
Error::Serialize(ref e) => fmt::Display::fmt(e, f),
Error::TooManyRedirects => f.pad("Too many redirects"),
Error::RedirectLoop => f.pad("Infinite redirect loop"),
Error::__DontMatchMe => unreachable!()
if let Some(ref url) = self.url {
try!(fmt::Display::fmt(url, f));
try!(f.write_str(": "));
}
match self.kind {
Kind::Http(ref e) => fmt::Display::fmt(e, f),
Kind::UrlEncoded(ref e) => fmt::Display::fmt(e, f),
Kind::Json(ref e) => fmt::Display::fmt(e, f),
Kind::TooManyRedirects => f.write_str("Too many redirects"),
Kind::RedirectLoop => f.write_str("Infinite redirect loop"),
}
}
}
impl StdError for Error {
fn description(&self) -> &str {
match *self {
Error::Http(ref e) => e.description(),
Error::Serialize(ref e) => e.description(),
Error::TooManyRedirects => "Too many redirects",
Error::RedirectLoop => "Infinite redirect loop",
Error::__DontMatchMe => unreachable!()
match self.kind {
Kind::Http(ref e) => e.description(),
Kind::UrlEncoded(ref e) => e.description(),
Kind::Json(ref e) => e.description(),
Kind::TooManyRedirects => "Too many redirects",
Kind::RedirectLoop => "Infinite redirect loop",
}
}
fn cause(&self) -> Option<&StdError> {
match *self {
Error::Http(ref e) => Some(e),
Error::Serialize(ref e) => Some(&**e),
Error::TooManyRedirects |
Error::RedirectLoop => None,
Error::__DontMatchMe => unreachable!()
match self.kind {
Kind::Http(ref e) => Some(e),
Kind::UrlEncoded(ref e) => Some(e),
Kind::Json(ref e) => Some(e),
Kind::TooManyRedirects |
Kind::RedirectLoop => None,
}
}
}
fn _assert_types() {
fn _assert_send<T: Send>() {
}
_assert_send::<Error>();
// pub(crate)
#[derive(Debug)]
pub enum Kind {
Http(::hyper::Error),
UrlEncoded(::serde_urlencoded::ser::Error),
Json(::serde_json::Error),
TooManyRedirects,
RedirectLoop,
}
impl From<::hyper::Error> for Error {
fn from(err: ::hyper::Error) -> Error {
Error::Http(err)
impl From<::hyper::Error> for Kind {
#[inline]
fn from(err: ::hyper::Error) -> Kind {
Kind::Http(err)
}
}
impl From<::url::ParseError> for Error {
fn from(err: ::url::ParseError) -> Error {
Error::Http(::hyper::Error::Uri(err))
impl From<::url::ParseError> for Kind {
#[inline]
fn from(err: ::url::ParseError) -> Kind {
Kind::Http(::hyper::Error::Uri(err))
}
}
impl From<::serde_urlencoded::ser::Error> for Error {
fn from(err: ::serde_urlencoded::ser::Error) -> Error {
Error::Serialize(Box::new(err))
impl From<::serde_urlencoded::ser::Error> for Kind {
#[inline]
fn from(err: ::serde_urlencoded::ser::Error) -> Kind {
Kind::UrlEncoded(err)
}
}
impl From<::serde_json::Error> for Error {
fn from(err: ::serde_json::Error) -> Error {
Error::Serialize(Box::new(err))
impl From<::serde_json::Error> for Kind {
#[inline]
fn from(err: ::serde_json::Error) -> Kind {
Kind::Json(err)
}
}
/// A `Result` alias where the `Err` case is `reqwest::Error`.
pub type Result<T> = ::std::result::Result<T, Error>;
pub struct InternalFrom<T>(pub T, pub Option<Url>);
impl From<InternalFrom<Error>> for Error {
#[inline]
fn from(other: InternalFrom<Error>) -> Error {
other.0
}
}
impl<T> From<InternalFrom<T>> for Error
where T: Into<Kind> {
#[inline]
fn from(other: InternalFrom<T>) -> Error {
Error {
kind: other.0.into(),
url: other.1,
}
}
}
#[inline]
pub fn from<T>(err: T) -> Error
where T: Into<Kind> {
InternalFrom(err, None).into()
}
#[inline]
pub fn loop_detected(url: Url) -> Error {
Error {
kind: Kind::RedirectLoop,
url: Some(url),
}
}
#[inline]
pub fn too_many_redirects(url: Url) -> Error {
Error {
kind: Kind::TooManyRedirects,
url: Some(url),
}
}
#[macro_export]
macro_rules! try_ {
($e:expr) => (
match $e {
Ok(v) => v,
Err(err) => {
return Err(::Error::from(::error::InternalFrom(err, None)));
}
}
);
($e:expr, $url:expr) => (
match $e {
Ok(v) => v,
Err(err) => {
return Err(::Error::from(::error::InternalFrom(err, Some($url.clone()))));
}
}
)
}

6
src/lib.rs
View File

@@ -124,9 +124,9 @@ pub use self::body::Body;
pub use self::redirect::RedirectPolicy;
pub use self::response::Response;
#[macro_use] mod error;
mod body;
mod client;
mod error;
mod redirect;
mod response;
@@ -161,4 +161,8 @@ fn _assert_impls() {
assert_send::<RequestBuilder>();
assert_send::<Response>();
assert_send::<Error>();
assert_sync::<Error>();
}

138
src/redirect.rs
View File

@@ -11,10 +11,22 @@ pub struct RedirectPolicy {
inner: Policy,
}
#[derive(Debug)]
pub struct RedirectAttempt<'a> {
next: &'a Url,
previous: &'a [Url],
}
/// An action to perform when a redirect status code is found.
#[derive(Debug)]
pub struct RedirectAction {
inner: Action,
}
impl RedirectPolicy {
/// Create a RedirectPolicy with a maximum number of redirects.
///
/// A `Error::TooManyRedirects` will be returned if the max is reached.
/// An `Error` will be returned if the max is reached.
pub fn limited(max: usize) -> RedirectPolicy {
RedirectPolicy {
inner: Policy::Limit(max),
@@ -36,45 +48,48 @@ impl RedirectPolicy {
/// chain, but the custom variant does not do that for you automatically.
/// The custom policy should have some way of handling those.
///
/// There are variants on `::Error` for both cases that can be used as
/// return values.
/// Information on the next request and previous requests can be found
/// on the `RedirectAttempt` argument passed to the closure.
///
/// Actions can be conveniently created from methods on the
/// `RedirectAttempt`.
///
/// # Example
///
/// ```no_run
/// # use reqwest::RedirectPolicy;
/// # let mut client = reqwest::Client::new().unwrap();
/// client.redirect(RedirectPolicy::custom(|next, previous| {
/// if previous.len() > 5 {
/// Err(reqwest::Error::TooManyRedirects)
/// } else if next.host_str() == Some("example.domain") {
/// client.redirect(RedirectPolicy::custom(|attempt| {
/// if attempt.previous().len() > 5 {
/// attempt.too_many_redirects()
/// } else if attempt.url().host_str() == Some("example.domain") {
/// // prevent redirects to 'example.domain'
/// Ok(false)
/// attempt.stop()
/// } else {
/// Ok(true)
/// attempt.follow()
/// }
/// }));
/// ```
pub fn custom<T>(policy: T) -> RedirectPolicy
where T: Fn(&Url, &[Url]) -> ::Result<bool> + Send + Sync + 'static {
where T: Fn(RedirectAttempt) -> RedirectAction + Send + Sync + 'static {
RedirectPolicy {
inner: Policy::Custom(Box::new(policy)),
}
}
fn redirect(&self, next: &Url, previous: &[Url]) -> ::Result<bool> {
fn redirect(&self, attempt: RedirectAttempt) -> RedirectAction {
match self.inner {
Policy::Custom(ref custom) => custom(next, previous),
Policy::Custom(ref custom) => custom(attempt),
Policy::Limit(max) => {
if previous.len() == max {
Err(::Error::TooManyRedirects)
} else if previous.contains(next) {
Err(::Error::RedirectLoop)
if attempt.previous.len() == max {
attempt.too_many_redirects()
} else if attempt.previous.contains(attempt.next) {
attempt.loop_detected()
} else {
Ok(true)
attempt.follow()
}
},
Policy::None => Ok(false),
Policy::None => attempt.stop(),
}
}
}
@@ -85,8 +100,53 @@ impl Default for RedirectPolicy {
}
}
impl<'a> RedirectAttempt<'a> {
/// Get the next URL to redirect to.
pub fn url(&self) -> &Url {
self.next
}
/// Get the list of previous URLs that have already been requested in this chain.
pub fn previous(&self) -> &[Url] {
self.previous
}
/// Returns an action meaning reqwest should follow the next URL.
pub fn follow(self) -> RedirectAction {
RedirectAction {
inner: Action::Follow,
}
}
/// Returns an action meaning reqwest should not follow the next URL.
///
/// The 30x response will be returned as the `Ok` result.
pub fn stop(self) -> RedirectAction {
RedirectAction {
inner: Action::Stop,
}
}
/// Returns an action meaning there was a loop of redirects found.
///
/// An `Error` will be returned for the result of the sent request.
pub fn loop_detected(self) -> RedirectAction {
RedirectAction {
inner: Action::LoopDetected,
}
}
/// Returns an action meaning there was a loop of redirects found.
///
/// An `Error` will be returned for the result of the sent request.
pub fn too_many_redirects(self) -> RedirectAction {
RedirectAction {
inner: Action::TooManyRedirects,
}
}
}
enum Policy {
Custom(Box<Fn(&Url, &[Url]) -> ::Result<bool> + Send + Sync + 'static>),
Custom(Box<Fn(RedirectAttempt) -> RedirectAction + Send + Sync + 'static>),
Limit(usize),
None,
}
@@ -101,8 +161,22 @@ impl fmt::Debug for Policy {
}
}
pub fn check_redirect(policy: &RedirectPolicy, next: &Url, previous: &[Url]) -> ::Result<bool> {
policy.redirect(next, previous)
// pub(crate)
#[derive(Debug, PartialEq)]
pub enum Action {
Follow,
Stop,
LoopDetected,
TooManyRedirects,
}
#[inline]
pub fn check_redirect(policy: &RedirectPolicy, next: &Url, previous: &[Url]) -> Action {
policy.redirect(RedirectAttempt {
next: next,
previous: previous,
}).inner
}
/*
@@ -132,32 +206,26 @@ fn test_redirect_policy_limit() {
.collect::<Vec<_>>();
match policy.redirect(&next, &previous) {
Ok(true) => {},
other => panic!("expected Ok(true), got: {:?}", other)
}
assert_eq!(check_redirect(&policy, &next, &previous), Action::Follow);
previous.push(Url::parse("http://a.b.d/e/33").unwrap());
match policy.redirect(&next, &previous) {
Err(::Error::TooManyRedirects) => {},
other => panic!("expected TooManyRedirects, got: {:?}", other)
}
assert_eq!(check_redirect(&policy, &next, &previous), Action::TooManyRedirects);
}
#[test]
fn test_redirect_policy_custom() {
let policy = RedirectPolicy::custom(|next, _previous| {
if next.host_str() == Some("foo") {
Ok(false)
let policy = RedirectPolicy::custom(|attempt| {
if attempt.url().host_str() == Some("foo") {
attempt.stop()
} else {
Ok(true)
attempt.follow()
}
});
let next = Url::parse("http://bar/baz").unwrap();
assert_eq!(policy.redirect(&next, &[]).unwrap(), true);
assert_eq!(check_redirect(&policy, &next, &[]), Action::Follow);
let next = Url::parse("http://foo/baz").unwrap();
assert_eq!(policy.redirect(&next, &[]).unwrap(), false);
assert_eq!(check_redirect(&policy, &next, &[]), Action::Stop);
}

2
src/response.rs
View File

@@ -89,7 +89,7 @@ impl Response {
/// Try and deserialize the response body as JSON.
#[inline]
pub fn json<T: Deserialize>(&mut self) -> ::Result<T> {
serde_json::from_reader(self).map_err(::Error::from)
serde_json::from_reader(self).map_err(::error::from)
}
}

5
tests/client.rs
View File

@@ -207,10 +207,7 @@ fn test_redirect_policy_can_return_errors() {
};
let err = reqwest::get(&format!("http://{}/loop", server.addr())).unwrap_err();
match err {
reqwest::Error::RedirectLoop => (),
e => panic!("wrong error received: {:?}", e),
}
assert!(err.is_redirect());
}
#[test]