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webrtchttp: Factor out the common bits for WHIP and WHEP

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/949>
This commit is contained in:
Sanchayan Maity 2022-10-27 17:51:09 +05:30
parent 6be5796888
commit b427cb6a3d
4 changed files with 208 additions and 280 deletions
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1
net/webrtchttp/src/lib.rs
View file

@ -15,6 +15,7 @@
* Since: plugins-rs-0.9.0
*/
use gst::glib;
mod utils;
mod whepsrc;
mod whipsink;

192
net/webrtchttp/src/utils.rs Normal file
View file

@ -0,0 +1,192 @@
use futures::future;
use futures::prelude::*;
use gst::{prelude::*, ErrorMessage};
use once_cell::sync::Lazy;
use parse_link_header;
use reqwest::header::HeaderMap;
use reqwest::redirect::Policy;
use std::fmt::Display;
use std::sync::Mutex;
use tokio::runtime;
pub static RUNTIME: Lazy<runtime::Runtime> = Lazy::new(|| {
runtime::Builder::new_multi_thread()
.enable_all()
.worker_threads(1)
.thread_name("webrtc-http-runtime")
.build()
.unwrap()
});
pub fn wait<F, T, E>(
canceller: &Mutex<Option<future::AbortHandle>>,
future: F,
) -> Result<T, ErrorMessage>
where
F: Send + Future<Output = Result<T, E>>,
T: Send + 'static,
E: Send + Display,
{
let mut canceller_guard = canceller.lock().unwrap();
let (abort_handle, abort_registration) = future::AbortHandle::new_pair();
if canceller_guard.is_some() {
return Err(gst::error_msg!(
gst::ResourceError::Failed,
["Old Canceller should not exist"]
));
}
canceller_guard.replace(abort_handle);
drop(canceller_guard);
let future = async {
match future::Abortable::new(future, abort_registration).await {
Ok(Ok(res)) => Ok(res),
Ok(Err(err)) => Err(gst::error_msg!(
gst::ResourceError::Failed,
["Future resolved with an error {}", err.to_string()]
)),
Err(future::Aborted) => Err(gst::error_msg!(
gst::ResourceError::Failed,
["Canceller called before future resolved"]
)),
}
};
let res = {
let _enter = RUNTIME.enter();
futures::executor::block_on(future)
};
canceller_guard = canceller.lock().unwrap();
*canceller_guard = None;
res
}
pub fn parse_redirect_location(
headermap: &HeaderMap,
old_url: &reqwest::Url,
) -> Result<reqwest::Url, ErrorMessage> {
let location = match headermap.get(reqwest::header::LOCATION) {
Some(location) => location,
None => {
return Err(gst::error_msg!(
gst::ResourceError::Failed,
["Location header field should be present for WHIP/WHEP resource URL"]
));
}
};
let location = match location.to_str() {
Ok(loc) => loc,
Err(e) => {
return Err(gst::error_msg!(
gst::ResourceError::Failed,
["Failed to convert location to string {}", e]
));
}
};
match reqwest::Url::parse(location) {
Ok(url) => Ok(url), // Location URL is an absolute path
Err(_) => {
// Location URL is a relative path
let new_url = old_url.clone().join(location).map_err(|err| {
gst::error_msg!(
gst::ResourceError::Failed,
["URL join operation failed: {:?}", err]
)
})?;
Ok(new_url)
}
}
}
pub fn build_reqwest_client(pol: Policy) -> reqwest::Client {
let client_builder = reqwest::Client::builder();
client_builder.redirect(pol).build().unwrap()
}
pub fn set_ice_servers(
webrtcbin: &gst::Element,
headermap: &HeaderMap,
) -> Result<(), ErrorMessage> {
for link in headermap.get_all("link").iter() {
let link = link.to_str().map_err(|err| {
gst::error_msg!(
gst::ResourceError::Failed,
[
"Header value should contain only visible ASCII strings: {}",
err
]
)
})?;
let item_map = match parse_link_header::parse_with_rel(link) {
Ok(map) => map,
Err(_) => continue,
};
let link = match item_map.contains_key("ice-server") {
true => item_map.get("ice-server").unwrap(),
false => continue, // Not a link header we care about
};
// Note: webrtcbin needs ice servers to be in the below format
// <scheme>://<user:pass>@<url>
// and the ice-servers (link headers) received from the whip server might be
// in the format <scheme>:<host> with username and password as separate params.
// Constructing these with 'url' crate also require a format/parse
// for changing <scheme>:<host> to <scheme>://<user>:<password>@<host>.
// So preferred to use the String rather
let mut ice_server_url;
// check if uri has ://
if link.uri.has_authority() {
// use raw_uri as is
// username and password in the link.uri.params ignored
ice_server_url = link.raw_uri.as_str().to_string();
} else {
// No builder pattern is provided by reqwest::Url. Use string operation.
// construct url as '<scheme>://<user:pass>@<url>'
ice_server_url = format!("{}://", link.uri.scheme());
if let Some(user) = link.params.get("username") {
ice_server_url += user.as_str();
if let Some(pass) = link.params.get("credential") {
ice_server_url = ice_server_url + ":" + pass.as_str();
}
ice_server_url += "@";
}
// the raw_uri contains the ice-server in the form <scheme>:<url>
// so strip the scheme and the ':' from the beginning of raw_uri and use
// the rest of raw_uri to append it the url which will be in the form
// <scheme>://<user:pass>@<url> as expected
ice_server_url += link
.raw_uri
.strip_prefix((link.uri.scheme().to_owned() + ":").as_str())
.expect("strip 'scheme:' from raw uri");
}
// It's nicer to not collapse the `else if` and its inner `if`
#[allow(clippy::collapsible_if)]
if link.uri.scheme() == "stun" {
webrtcbin.set_property_from_str("stun-server", ice_server_url.as_str());
} else if link.uri.scheme().starts_with("turn") {
if !webrtcbin.emit_by_name::<bool>("add-turn-server", &[&ice_server_url.as_str()]) {
return Err(gst::error_msg!(
gst::ResourceError::Failed,
["Failed to set turn server {}", ice_server_url]
));
}
}
}
Ok(())
}

193
net/webrtchttp/src/whepsrc/imp.rs
View file

@ -7,24 +7,16 @@
//
// SPDX-License-Identifier: MPL-2.0
use crate::utils::{build_reqwest_client, parse_redirect_location, set_ice_servers, wait};
use crate::GstRsWebRTCICETransportPolicy;
use bytes::Bytes;
use futures::future;
use futures::prelude::*;
use tokio::runtime;
use gst::{element_imp_error, glib, prelude::*, subclass::prelude::*, ErrorMessage};
use gst_sdp::*;
use gst_webrtc::*;
use bytes::Bytes;
use once_cell::sync::Lazy;
use parse_link_header;
use reqwest::header::{HeaderMap, HeaderValue};
use reqwest::redirect::Policy;
use reqwest::StatusCode;
use std::fmt::Display;
use std::sync::Mutex;
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
@ -35,14 +27,6 @@ static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
)
});
static RUNTIME: Lazy<runtime::Runtime> = Lazy::new(|| {
runtime::Builder::new_multi_thread()
.enable_all()
.worker_threads(1)
.build()
.unwrap()
});
const DEFAULT_ICE_TRANSPORT_POLICY: GstRsWebRTCICETransportPolicy =
GstRsWebRTCICETransportPolicy::All;
const MAX_REDIRECTS: u8 = 10;
@ -618,7 +602,7 @@ impl WhepSrc {
.lock()
.expect("Failed to acquire settings lock");
if settings.use_link_headers {
self.set_ice_servers(resp.headers());
set_ice_servers(&self.webrtcbin, resp.headers())?;
}
drop(settings);
@ -660,10 +644,7 @@ impl WhepSrc {
};
drop(state);
let ans_bytes = match self.wait(resp.bytes()) {
Ok(ans) => ans,
Err(e) => return Err(e),
};
let ans_bytes = wait(&self.canceller, resp.bytes())?;
self.sdp_message_parse(ans_bytes)
}
@ -717,7 +698,7 @@ impl WhepSrc {
[
"Unexpected response: {} - {}",
s.as_str(),
self.wait(resp.bytes())
wait(&self.canceller, resp.bytes())
.map(|x| x.escape_ascii().to_string())
.unwrap_or_else(|_| "(no further details)".to_string())
]
@ -874,96 +855,6 @@ impl WhepSrc {
}
}
// Taken from WHIP sink
fn set_ice_servers(&self, headermap: &HeaderMap) {
for link in headermap.get_all("link").iter() {
let link = link
.to_str()
.expect("Header value should contain only visible ASCII strings");
let item_map = match parse_link_header::parse_with_rel(link) {
Ok(map) => map,
Err(e) => {
gst::warning!(
CAT,
imp: self,
"Failed to set ICE server {} due to {:?}",
link,
e
);
continue;
}
};
let link = match item_map.contains_key("ice-server") {
true => item_map.get("ice-server").unwrap(),
false => continue, // Not a link header we care about
};
// Note: webrtcbin needs ice servers to be in the below format
// <scheme>://<user:pass>@<url>
// and the ice-servers (link headers) received from the whip server might be
// in the format <scheme>:<host> with username and password as separate params.
// Constructing these with 'url' crate also require a format/parse
// for changing <scheme>:<host> to <scheme>://<user>:<password>@<host>.
// So preferred to use the String rather
let mut ice_server_url;
// check if uri has ://
if link.uri.has_authority() {
// use raw_uri as is
// username and password in the link.uri.params ignored
ice_server_url = link.raw_uri.as_str().to_string();
} else {
// construct url as '<scheme>://<user:pass>@<url>'
ice_server_url = format!("{}://", link.uri.scheme());
if let Some(user) = link.params.get("username") {
ice_server_url += user.as_str();
if let Some(pass) = link.params.get("credential") {
ice_server_url = ice_server_url + ":" + pass.as_str();
}
ice_server_url += "@";
}
// the raw_uri contains the ice-server in the form <scheme>:<url>
// so strip the scheme and the ':' from the beginning of raw_uri and use
// the rest of raw_uri to append it the url which will be in the form
// <scheme>://<user:pass>@<url> as expected
ice_server_url += link
.raw_uri
.strip_prefix((link.uri.scheme().to_owned() + ":").as_str())
.expect("strip 'scheme:' from raw uri");
}
gst::info!(
CAT,
imp: self,
"Setting STUN/TURN server {}",
ice_server_url
);
// It's nicer to not collapse the `else if` and its inner `if`
#[allow(clippy::collapsible_if)]
if link.uri.scheme() == "stun" {
self.webrtcbin
.set_property_from_str("stun-server", ice_server_url.as_str());
} else if link.uri.scheme().starts_with("turn") {
if !self
.webrtcbin
.emit_by_name::<bool>("add-turn-server", &[&ice_server_url.as_str()])
{
gst::error!(
CAT,
imp: self,
"Failed to set turn server {}",
ice_server_url
);
}
}
}
}
fn send_sdp(&self, sdp: SDPMessage) -> Result<(), gst::ErrorMessage> {
let sess_desc = WebRTCSessionDescription::new(WebRTCSDPType::Offer, sdp);
let settings = self.settings.lock().unwrap();
@ -1025,7 +916,7 @@ impl WhepSrc {
.body(body)
.send();
let resp = self.wait(future)?;
let resp = wait(&self.canceller, future)?;
self.parse_endpoint_response(endpoint, 0, resp)
}
@ -1068,7 +959,7 @@ impl WhepSrc {
let client = build_reqwest_client(reqwest::redirect::Policy::default());
let future = client.delete(resource_url).headers(headermap).send();
let res = self.wait(future);
let res = wait(&self.canceller, future);
match res {
Ok(r) => {
gst::debug!(CAT, imp: self, "Response to DELETE : {}", r.status());
@ -1078,74 +969,4 @@ impl WhepSrc {
}
};
}
fn wait<F, T, E>(&self, future: F) -> Result<T, ErrorMessage>
where
F: Send + Future<Output = Result<T, E>>,
T: Send + 'static,
E: Send + Display,
{
let mut canceller = self.canceller.lock().unwrap();
let (abort_handle, abort_registration) = future::AbortHandle::new_pair();
canceller.replace(abort_handle);
drop(canceller);
let future = async {
match future::Abortable::new(future, abort_registration).await {
Ok(Ok(res)) => Ok(res),
Ok(Err(err)) => Err(gst::error_msg!(
gst::ResourceError::Failed,
["Future resolved with an error {}", err.to_string()]
)),
Err(future::Aborted) => Err(gst::error_msg!(
gst::ResourceError::Failed,
["Canceller called before future resolved"]
)),
}
};
let res = {
let _enter = RUNTIME.enter();
futures::executor::block_on(future)
};
let _ = self.canceller.lock().unwrap().take();
res
}
}
fn parse_redirect_location(
headermap: &HeaderMap,
old_url: &reqwest::Url,
) -> Result<reqwest::Url, ErrorMessage> {
let location = headermap.get(reqwest::header::LOCATION).unwrap();
if let Err(e) = location.to_str() {
return Err(gst::error_msg!(
gst::ResourceError::Failed,
[
"Failed to convert the redirect location to string {}",
e.to_string()
]
));
}
let location = location.to_str().unwrap();
if location.to_ascii_lowercase().starts_with("http") {
// Location URL is an absolute path
reqwest::Url::parse(location)
.map_err(|e| gst::error_msg!(gst::ResourceError::Failed, ["{}", e.to_string()]))
} else {
// Location URL is a relative path
let mut new_url = old_url.clone();
new_url.set_path(location);
Ok(new_url)
}
}
fn build_reqwest_client(pol: Policy) -> reqwest::Client {
let client_builder = reqwest::Client::builder();
client_builder.redirect(pol).build().unwrap()
}

102
net/webrtchttp/src/whipsink/imp.rs
View file

@ -7,8 +7,8 @@
//
// SPDX-License-Identifier: MPL-2.0
use crate::utils::{build_reqwest_client, parse_redirect_location, wait};
use futures::future;
use futures::prelude::*;
use gst::glib;
use gst::prelude::*;
use gst::subclass::prelude::*;
@ -19,24 +19,13 @@ use once_cell::sync::Lazy;
use parse_link_header;
use reqwest::header::HeaderMap;
use reqwest::header::HeaderValue;
use reqwest::redirect::Policy;
use reqwest::StatusCode;
use std::fmt::Display;
use std::sync::Mutex;
use tokio::runtime;
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new("whipsink", gst::DebugColorFlags::empty(), Some("WHIP Sink"))
});
static RUNTIME: Lazy<runtime::Runtime> = Lazy::new(|| {
runtime::Builder::new_multi_thread()
.enable_all()
.worker_threads(1)
.build()
.unwrap()
});
const MAX_REDIRECTS: u8 = 10;
#[derive(Debug, Clone)]
@ -400,7 +389,7 @@ impl WhipSink {
.headers(headermap)
.send();
let resp = match self.wait(future) {
let resp = match wait(&self.canceller, future) {
Ok(r) => r,
Err(e) => {
return Err(e);
@ -444,7 +433,7 @@ impl WhipSink {
[
"lookup_ice_servers - Unexpected response {} {:?}",
status,
self.wait(resp.bytes()).unwrap()
wait(&self.canceller, resp.bytes()).unwrap()
]
)),
}
@ -624,7 +613,7 @@ impl WhipSink {
.body(body)
.send();
let resp = match self.wait(future) {
let resp = match wait(&self.canceller, future) {
Ok(r) => r,
Err(e) => {
return Err(e);
@ -654,7 +643,7 @@ impl WhipSink {
};
drop(state);
let ans_bytes = match self.wait(resp.bytes()) {
let ans_bytes = match wait(&self.canceller, resp.bytes()) {
Ok(ans) => ans.to_vec(),
Err(e) => return Err(e),
};
@ -709,7 +698,7 @@ impl WhipSink {
[
"Server returned error: {} - {}",
s.as_str(),
self.wait(resp.bytes())
wait(&self.canceller, resp.bytes())
.map(|x| x.escape_ascii().to_string())
.unwrap_or_else(|_| "(no further details)".to_string())
]
@ -721,7 +710,7 @@ impl WhipSink {
[
"Unexpected response {:?} {:?}",
s,
self.wait(resp.bytes()).unwrap()
wait(&self.canceller, resp.bytes()).unwrap()
]
)),
};
@ -757,7 +746,7 @@ impl WhipSink {
let client = build_reqwest_client(reqwest::redirect::Policy::default());
let future = client.delete(resource_url).headers(headermap).send();
let res = self.wait(future);
let res = wait(&self.canceller, future);
match res {
Ok(r) => {
gst::debug!(CAT, imp: self, "Response to DELETE : {}", r.status());
@ -767,79 +756,4 @@ impl WhipSink {
}
};
}
fn wait<F, T, E>(&self, future: F) -> Result<T, ErrorMessage>
where
F: Send + Future<Output = Result<T, E>>,
T: Send + 'static,
E: Send + Display,
{
let mut canceller = self.canceller.lock().unwrap();
let (abort_handle, abort_registration) = future::AbortHandle::new_pair();
canceller.replace(abort_handle);
drop(canceller);
// make abortable
let future = async {
match future::Abortable::new(future, abort_registration).await {
// Future resolved successfully
Ok(Ok(res)) => Ok(res),
// Future resolved with an error
Ok(Err(err)) => Err(gst::error_msg!(
gst::ResourceError::Failed,
["Future resolved with an error {}", err.to_string()]
)),
// Canceller called before future resolved
Err(future::Aborted) => Err(gst::error_msg!(
gst::ResourceError::Failed,
["Canceller called before future resolved"]
)),
}
};
let res = {
let _enter = RUNTIME.enter();
futures::executor::block_on(future)
};
/* Clear out the canceller */
let _ = self.canceller.lock().unwrap().take();
res
}
}
fn parse_redirect_location(
headermap: &HeaderMap,
old_url: &reqwest::Url,
) -> Result<reqwest::Url, ErrorMessage> {
let location = headermap.get(reqwest::header::LOCATION).unwrap();
if let Err(e) = location.to_str() {
return Err(gst::error_msg!(
gst::ResourceError::Failed,
[
"Failed to convert the redirect location to string {}",
e.to_string()
]
));
}
let location = location.to_str().unwrap();
if location.to_ascii_lowercase().starts_with("http") {
// location url is an absolute path
reqwest::Url::parse(location)
.map_err(|e| gst::error_msg!(gst::ResourceError::Failed, ["{}", e.to_string()]))
} else {
// location url is a relative path
let mut new_url = old_url.clone();
new_url.set_path(location);
Ok(new_url)
}
}
fn build_reqwest_client(pol: Policy) -> reqwest::Client {
let client_builder = reqwest::Client::builder();
client_builder.redirect(pol).build().unwrap()
}