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implementing working demonstration of calling Fetch asynchronously
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parent
872ee19534
commit
3f79667050
5 changed files with 264 additions and 169 deletions
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@ -4,10 +4,10 @@
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//! The [Response](https://fetch.spec.whatwg.org/#responses) object
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//! resulting from a [fetch operation](https://fetch.spec.whatwg.org/#concept-fetch)
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use hyper::header::Headers;
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use hyper::header::{AccessControlExposeHeaders, Headers};
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use hyper::status::StatusCode;
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use std::cell::RefCell;
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use std::rc::Rc;
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use std::ascii::AsciiExt;
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use std::cell::{Cell, RefCell};
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use url::Url;
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/// [Response type](https://fetch.spec.whatwg.org/#concept-response-type)
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@ -38,6 +38,16 @@ pub enum ResponseBody {
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Done(Vec<u8>),
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}
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impl ResponseBody {
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pub fn is_done(&self) -> bool {
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match *self {
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ResponseBody::Done(..) => true,
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ResponseBody::Empty | ResponseBody::Receiving(..) => false
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}
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}
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}
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/// [Cache state](https://fetch.spec.whatwg.org/#concept-response-cache-state)
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#[derive(Clone, Debug)]
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pub enum CacheState {
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@ -76,7 +86,9 @@ pub struct Response {
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pub https_state: HttpsState,
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/// [Internal response](https://fetch.spec.whatwg.org/#concept-internal-response), only used if the Response
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/// is a filtered response
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pub internal_response: Option<Rc<Response>>,
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pub internal_response: Option<Box<Response>>,
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/// whether or not to try to return the internal_response when asked for actual_response
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pub return_internal: Cell<bool>,
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}
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impl Response {
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@ -91,7 +103,8 @@ impl Response {
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body: RefCell::new(ResponseBody::Empty),
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cache_state: CacheState::None,
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https_state: HttpsState::None,
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internal_response: None
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internal_response: None,
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return_internal: Cell::new(true)
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}
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}
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@ -101,4 +114,92 @@ impl Response {
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_ => false
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}
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}
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pub fn get_actual_response(&self) -> &Response {
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if self.return_internal.get() && self.internal_response.is_some() {
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&**self.internal_response.as_ref().unwrap()
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} else {
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self
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}
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}
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pub fn to_actual(self) -> Response {
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if self.return_internal.get() && self.internal_response.is_some() {
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*self.internal_response.unwrap()
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} else {
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self
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}
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}
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/// Convert to a filtered response, of type `filter_type`.
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/// Do not use with type Error or Default
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pub fn to_filtered(self, filter_type: ResponseType) -> Response {
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assert!(filter_type != ResponseType::Error);
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assert!(filter_type != ResponseType::Default);
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let old_response = self.to_actual();
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if Response::is_network_error(&old_response) {
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return Response::network_error();
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}
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let old_headers = old_response.headers.clone();
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let mut response = old_response.clone();
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response.internal_response = Some(Box::new(old_response));
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response.response_type = filter_type;
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match filter_type {
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ResponseType::Default | ResponseType::Error => unreachable!(),
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ResponseType::Basic => {
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let headers = old_headers.iter().filter(|header| {
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match &*header.name().to_ascii_lowercase() {
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"set-cookie" | "set-cookie2" => false,
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_ => true
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}
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}).collect();
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response.headers = headers;
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},
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ResponseType::CORS => {
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let access = old_headers.get::<AccessControlExposeHeaders>();
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let allowed_headers = access.as_ref().map(|v| &v[..]).unwrap_or(&[]);
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let headers = old_headers.iter().filter(|header| {
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match &*header.name().to_ascii_lowercase() {
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"cache-control" | "content-language" | "content-type" |
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"expires" | "last-modified" | "pragma" => true,
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"set-cookie" | "set-cookie2" => false,
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header => {
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let result =
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allowed_headers.iter().find(|h| *header == *h.to_ascii_lowercase());
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result.is_some()
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}
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}
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}).collect();
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response.headers = headers;
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},
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ResponseType::Opaque => {
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response.url_list = RefCell::new(vec![]);
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response.url = None;
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response.headers = Headers::new();
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response.status = None;
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response.body = RefCell::new(ResponseBody::Empty);
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response.cache_state = CacheState::None;
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},
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ResponseType::OpaqueRedirect => {
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response.headers = Headers::new();
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response.status = None;
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response.body = RefCell::new(ResponseBody::Empty);
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response.cache_state = CacheState::None;
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}
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}
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response
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}
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}
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