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Initial moq-transport-01 support (#115) 

Co-authored-by: Mike English <mike.english@gmail.com>
This commit is contained in:
kixelated 2023-11-03 13:19:41 +09:00 committed by GitHub
parent d55c4a80d1
commit ddfe7963e6
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40 changed files with 1005 additions and 306 deletions
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1
Cargo.lock generated
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@ -1107,6 +1107,7 @@ dependencies = [
name = "moq-transport"
version = "0.2.0"
dependencies = [
"async-trait",
"bytes",
"indexmap 2.0.0",
"log",

50
moq-pub/src/media.rs
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@ -1,6 +1,6 @@
use crate::cli::Config;
use anyhow::{self, Context};
use moq_transport::cache::{broadcast, segment, track};
use moq_transport::cache::{broadcast, fragment, segment, track};
use moq_transport::VarInt;
use mp4::{self, ReadBox};
use serde_json::json;
@ -44,11 +44,17 @@ impl Media {
let mut init_track = broadcast.create_track("0.mp4")?;
let mut init_segment = init_track.create_segment(segment::Info {
sequence: VarInt::ZERO,
priority: i32::MAX,
priority: 0,
expires: None,
})?;
init_segment.write_chunk(init.into())?;
// Create a single fragment, optionally setting the size
let mut init_fragment = init_segment.create_fragment(fragment::Info {
sequence: VarInt::ZERO,
size: None, // size is only needed when we have multiple fragments.
})?;
init_fragment.write_chunk(init.into())?;
let mut tracks = HashMap::new();
@ -128,7 +134,7 @@ impl Media {
) -> Result<(), anyhow::Error> {
let mut segment = track.create_segment(segment::Info {
sequence: VarInt::ZERO,
priority: i32::MAX,
priority: 0,
expires: None,
})?;
@ -211,8 +217,14 @@ impl Media {
let catalog_str = serde_json::to_string_pretty(&catalog)?;
log::info!("catalog: {}", catalog_str);
// Create a single fragment for the segment.
let mut fragment = segment.create_fragment(fragment::Info {
sequence: VarInt::ZERO,
size: None, // Size is only needed when we have multiple fragments.
})?;
// Add the segment and add the fragment.
segment.write_chunk(catalog_str.into())?;
fragment.write_chunk(catalog_str.into())?;
Ok(())
}
@ -260,7 +272,7 @@ struct Track {
track: track::Publisher,
// The current segment
segment: Option<segment::Publisher>,
current: Option<fragment::Publisher>,
// The number of units per second.
timescale: u64,
@ -274,16 +286,16 @@ impl Track {
Self {
track,
sequence: 0,
segment: None,
current: None,
timescale,
}
}
pub fn header(&mut self, raw: Vec<u8>, fragment: Fragment) -> anyhow::Result<()> {
if let Some(segment) = self.segment.as_mut() {
if let Some(current) = self.current.as_mut() {
if !fragment.keyframe {
// Use the existing segment
segment.write_chunk(raw.into())?;
current.write_chunk(raw.into())?;
return Ok(());
}
}
@ -292,7 +304,7 @@ impl Track {
// Compute the timestamp in milliseconds.
// Overflows after 583 million years, so we're fine.
let timestamp: i32 = fragment
let timestamp: u32 = fragment
.timestamp(self.timescale)
.as_millis()
.try_into()
@ -301,26 +313,34 @@ impl Track {
// Create a new segment.
let mut segment = self.track.create_segment(segment::Info {
sequence: VarInt::try_from(self.sequence).context("sequence too large")?,
priority: timestamp, // newer segments are higher priority
// Newer segments are higher priority
priority: u32::MAX.checked_sub(timestamp).context("priority too large")?,
// Delete segments after 10s.
expires: Some(time::Duration::from_secs(10)),
})?;
// Create a single fragment for the segment that we will keep appending.
let mut fragment = segment.create_fragment(fragment::Info {
sequence: VarInt::ZERO,
size: None,
})?;
self.sequence += 1;
// Insert the raw atom into the segment.
segment.write_chunk(raw.into())?;
fragment.write_chunk(raw.into())?;
// Save for the next iteration
self.segment = Some(segment);
self.current = Some(fragment);
Ok(())
}
pub fn data(&mut self, raw: Vec<u8>) -> anyhow::Result<()> {
let segment = self.segment.as_mut().context("missing segment")?;
segment.write_chunk(raw.into())?;
let fragment = self.current.as_mut().context("missing current fragment")?;
fragment.write_chunk(raw.into())?;
Ok(())
}

16
moq-relay/src/error.rs
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@ -37,15 +37,15 @@ impl moq_transport::MoqError for RelayError {
}
}
fn reason(&self) -> &str {
fn reason(&self) -> String {
match self {
Self::Transport(err) => err.reason(),
Self::Cache(err) => err.reason(),
Self::MoqApi(_err) => "api error",
Self::Url(_) => "url error",
Self::MissingNode => "missing node",
Self::WebTransportServer(_) => "server error",
Self::WebTransportClient(_) => "upstream error",
Self::Transport(err) => format!("transport error: {}", err.reason()),
Self::Cache(err) => format!("cache error: {}", err.reason()),
Self::MoqApi(err) => format!("api error: {}", err),
Self::Url(err) => format!("url error: {}", err),
Self::MissingNode => "missing node".to_owned(),
Self::WebTransportServer(err) => format!("upstream server error: {}", err),
Self::WebTransportClient(err) => format!("upstream client error: {}", err),
}
}
}

2
moq-transport/Cargo.toml
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@ -24,3 +24,5 @@ indexmap = "2"
quinn = "0.10"
webtransport-quinn = "0.6"
#webtransport-quinn = { path = "../../webtransport-rs/webtransport-quinn" }
async-trait = "0.1"

4
moq-transport/src/cache/broadcast.rs vendored
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@ -136,12 +136,12 @@ impl Publisher {
}
/// Block until the next track requested by a subscriber.
pub async fn next_track(&mut self) -> Result<Option<track::Publisher>, CacheError> {
pub async fn next_track(&mut self) -> Result<track::Publisher, CacheError> {
loop {
let notify = {
let state = self.state.lock();
if state.has_next()? {
return Ok(Some(state.into_mut().next()));
return Ok(state.into_mut().next());
}
state.changed()

12
moq-transport/src/cache/error.rs vendored
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@ -39,13 +39,13 @@ impl MoqError for CacheError {
}
/// A reason that is sent over the wire.
fn reason(&self) -> &str {
fn reason(&self) -> String {
match self {
Self::Closed => "closed",
Self::Reset(_) => "reset",
Self::Stop => "stop",
Self::NotFound => "not found",
Self::Duplicate => "duplicate",
Self::Closed => "closed".to_owned(),
Self::Reset(code) => format!("reset code: {}", code),
Self::Stop => "stop".to_owned(),
Self::NotFound => "not found".to_owned(),
Self::Duplicate => "duplicate".to_owned(),
}
}
}

216
moq-transport/src/cache/fragment.rs vendored Normal file
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@ -0,0 +1,216 @@
//! A fragment is a stream of bytes with a header, split into a [Publisher] and [Subscriber] handle.
//!
//! A [Publisher] writes an ordered stream of bytes in chunks.
//! There's no framing, so these chunks can be of any size or position, and won't be maintained over the network.
//!
//! A [Subscriber] reads an ordered stream of bytes in chunks.
//! These chunks are returned directly from the QUIC connection, so they may be of any size or position.
//! You can clone the [Subscriber] and each will read a copy of of all future chunks. (fanout)
//!
//! The fragment is closed with [CacheError::Closed] when all publishers or subscribers are dropped.
use core::fmt;
use std::{ops::Deref, sync::Arc};
use crate::VarInt;
use bytes::Bytes;
use super::{CacheError, Watch};
/// Create a new segment with the given info.
pub fn new(info: Info) -> (Publisher, Subscriber) {
let state = Watch::new(State::default());
let info = Arc::new(info);
let publisher = Publisher::new(state.clone(), info.clone());
let subscriber = Subscriber::new(state, info);
(publisher, subscriber)
}
/// Static information about the segment.
#[derive(Debug)]
pub struct Info {
// The sequence number of the fragment within the segment.
// NOTE: These may be received out of order or with gaps.
pub sequence: VarInt,
// The size of the fragment, optionally None if this is the last fragment in a segment.
// TODO enforce this size.
pub size: Option<VarInt>,
}
struct State {
// The data that has been received thus far.
chunks: Vec<Bytes>,
// Set when the publisher is dropped.
closed: Result<(), CacheError>,
}
impl State {
pub fn close(&mut self, err: CacheError) -> Result<(), CacheError> {
self.closed.clone()?;
self.closed = Err(err);
Ok(())
}
pub fn bytes(&self) -> usize {
self.chunks.iter().map(|f| f.len()).sum::<usize>()
}
}
impl Default for State {
fn default() -> Self {
Self {
chunks: Vec::new(),
closed: Ok(()),
}
}
}
impl fmt::Debug for State {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// We don't want to print out the contents, so summarize.
f.debug_struct("State")
.field("chunks", &self.chunks.len().to_string())
.field("bytes", &self.bytes().to_string())
.field("closed", &self.closed)
.finish()
}
}
/// Used to write data to a segment and notify subscribers.
pub struct Publisher {
// Mutable segment state.
state: Watch<State>,
// Immutable segment state.
info: Arc<Info>,
// Closes the segment when all Publishers are dropped.
_dropped: Arc<Dropped>,
}
impl Publisher {
fn new(state: Watch<State>, info: Arc<Info>) -> Self {
let _dropped = Arc::new(Dropped::new(state.clone()));
Self { state, info, _dropped }
}
/// Write a new chunk of bytes.
pub fn write_chunk(&mut self, chunk: Bytes) -> Result<(), CacheError> {
let mut state = self.state.lock_mut();
state.closed.clone()?;
state.chunks.push(chunk);
Ok(())
}
/// Close the segment with an error.
pub fn close(self, err: CacheError) -> Result<(), CacheError> {
self.state.lock_mut().close(err)
}
}
impl Deref for Publisher {
type Target = Info;
fn deref(&self) -> &Self::Target {
&self.info
}
}
impl fmt::Debug for Publisher {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Publisher")
.field("state", &self.state)
.field("info", &self.info)
.finish()
}
}
/// Notified when a segment has new data available.
#[derive(Clone)]
pub struct Subscriber {
// Modify the segment state.
state: Watch<State>,
// Immutable segment state.
info: Arc<Info>,
// The number of chunks that we've read.
// NOTE: Cloned subscribers inherit this index, but then run in parallel.
index: usize,
// Dropped when all Subscribers are dropped.
_dropped: Arc<Dropped>,
}
impl Subscriber {
fn new(state: Watch<State>, info: Arc<Info>) -> Self {
let _dropped = Arc::new(Dropped::new(state.clone()));
Self {
state,
info,
index: 0,
_dropped,
}
}
/// Block until the next chunk of bytes is available.
pub async fn read_chunk(&mut self) -> Result<Option<Bytes>, CacheError> {
loop {
let notify = {
let state = self.state.lock();
if self.index < state.chunks.len() {
let chunk = state.chunks[self.index].clone();
self.index += 1;
return Ok(Some(chunk));
}
match &state.closed {
Err(CacheError::Closed) => return Ok(None),
Err(err) => return Err(err.clone()),
Ok(()) => state.changed(),
}
};
notify.await; // Try again when the state changes
}
}
}
impl Deref for Subscriber {
type Target = Info;
fn deref(&self) -> &Self::Target {
&self.info
}
}
impl fmt::Debug for Subscriber {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Subscriber")
.field("state", &self.state)
.field("info", &self.info)
.field("index", &self.index)
.finish()
}
}
struct Dropped {
// Modify the segment state.
state: Watch<State>,
}
impl Dropped {
fn new(state: Watch<State>) -> Self {
Self { state }
}
}
impl Drop for Dropped {
fn drop(&mut self) {
self.state.lock_mut().close(CacheError::Closed).ok();
}
}

11
moq-transport/src/cache/mod.rs vendored
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@ -1,10 +1,17 @@
//! Allows a publisher to push updates, automatically caching and fanning it out to any subscribers.
//!
//! The naming scheme doesn't match the spec because it's vague and confusing.
//! The hierarchy is: [broadcast] -> [track] -> [segment] -> [Bytes](bytes::Bytes)
//! The hierarchy is: [broadcast] -> [track] -> [segment] -> [fragment] -> [Bytes](bytes::Bytes)
//!
//! The naming scheme doesn't match the spec because it's more strict, and bikeshedding of course:
//!
//! - [broadcast] is kinda like "track namespace"
//! - [track] is "track"
//! - [segment] is "group" but MUST use a single stream.
//! - [fragment] is "object" but MUST have the same properties as the segment.
pub mod broadcast;
mod error;
pub mod fragment;
pub mod segment;
pub mod track;

47
moq-transport/src/cache/segment.rs vendored
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@ -1,20 +1,18 @@
//! A segment is a stream of bytes with a header, split into a [Publisher] and [Subscriber] handle.
//! A segment is a stream of fragments with a header, split into a [Publisher] and [Subscriber] handle.
//!
//! A [Publisher] writes an ordered stream of bytes in chunks.
//! There's no framing, so these chunks can be of any size or position, and won't be maintained over the network.
//! A [Publisher] writes an ordered stream of fragments.
//! Each fragment can have a sequence number, allowing the subscriber to detect gaps fragments.
//!
//! A [Subscriber] reads an ordered stream of bytes in chunks.
//! These chunks are returned directly from the QUIC connection, so they may be of any size or position.
//! A closed [Subscriber] will receive a copy of all future chunks. (fanout)
//! A [Subscriber] reads an ordered stream of fragments.
//! The subscriber can be cloned, in which case each subscriber receives a copy of each fragment. (fanout)
//!
//! The segment is closed with [CacheError::Closed] when all publishers or subscribers are dropped.
use core::fmt;
use std::{ops::Deref, sync::Arc, time};
use crate::VarInt;
use bytes::Bytes;
use super::{CacheError, Watch};
use super::{fragment, CacheError, Watch};
/// Create a new segment with the given info.
pub fn new(info: Info) -> (Publisher, Subscriber) {
@ -31,10 +29,11 @@ pub fn new(info: Info) -> (Publisher, Subscriber) {
#[derive(Debug)]
pub struct Info {
// The sequence number of the segment within the track.
// NOTE: These may be received out of order or with gaps.
pub sequence: VarInt,
// The priority of the segment within the BROADCAST.
pub priority: i32,
pub priority: u32,
// Cache the segment for at most this long.
pub expires: Option<time::Duration>,
@ -42,7 +41,7 @@ pub struct Info {
struct State {
// The data that has been received thus far.
data: Vec<Bytes>,
fragments: Vec<fragment::Subscriber>,
// Set when the publisher is dropped.
closed: Result<(), CacheError>,
@ -59,7 +58,7 @@ impl State {
impl Default for State {
fn default() -> Self {
Self {
data: Vec::new(),
fragments: Vec::new(),
closed: Ok(()),
}
}
@ -67,12 +66,8 @@ impl Default for State {
impl fmt::Debug for State {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// We don't want to print out the contents, so summarize.
let size = self.data.iter().map(|chunk| chunk.len()).sum::<usize>();
let data = format!("size={} chunks={}", size, self.data.len());
f.debug_struct("State")
.field("data", &data)
.field("fragments", &self.fragments)
.field("closed", &self.closed)
.finish()
}
@ -96,14 +91,20 @@ impl Publisher {
Self { state, info, _dropped }
}
/// Write a new chunk of bytes.
pub fn write_chunk(&mut self, data: Bytes) -> Result<(), CacheError> {
/// Write a fragment
pub fn push_fragment(&mut self, fragment: fragment::Subscriber) -> Result<(), CacheError> {
let mut state = self.state.lock_mut();
state.closed.clone()?;
state.data.push(data);
state.fragments.push(fragment);
Ok(())
}
pub fn create_fragment(&mut self, fragment: fragment::Info) -> Result<fragment::Publisher, CacheError> {
let (publisher, subscriber) = fragment::new(fragment);
self.push_fragment(subscriber)?;
Ok(publisher)
}
/// Close the segment with an error.
pub fn close(self, err: CacheError) -> Result<(), CacheError> {
self.state.lock_mut().close(err)
@ -157,14 +158,14 @@ impl Subscriber {
}
/// Block until the next chunk of bytes is available.
pub async fn read_chunk(&mut self) -> Result<Option<Bytes>, CacheError> {
pub async fn next_fragment(&mut self) -> Result<Option<fragment::Subscriber>, CacheError> {
loop {
let notify = {
let state = self.state.lock();
if self.index < state.data.len() {
let chunk = state.data[self.index].clone();
if self.index < state.fragments.len() {
let fragment = state.fragments[self.index].clone();
self.index += 1;
return Ok(Some(chunk));
return Ok(Some(fragment));
}
match &state.closed {

2
moq-transport/src/cache/track.rs vendored
View File

@ -206,7 +206,7 @@ impl Subscriber {
}
}
/// Block until the next segment arrives, or return None if the track is [CacheError::Closed].
/// Block until the next segment arrives
pub async fn next_segment(&mut self) -> Result<Option<segment::Subscriber>, CacheError> {
loop {
let notify = {

33
moq-transport/src/coding/decode.rs
View File

@ -1,5 +1,5 @@
use super::{BoundsExceeded, VarInt};
use std::str;
use std::{io, str};
use thiserror::Error;
@ -7,6 +7,13 @@ use thiserror::Error;
// TODO Use trait aliases when they're stable, or add these bounds to every method.
pub trait AsyncRead: tokio::io::AsyncRead + Unpin + Send {}
impl AsyncRead for webtransport_quinn::RecvStream {}
impl<T> AsyncRead for tokio::io::Take<&mut T> where T: AsyncRead {}
impl<T: AsRef<[u8]> + Unpin + Send> AsyncRead for io::Cursor<T> {}
#[async_trait::async_trait]
pub trait Decode: Sized {
async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError>;
}
/// A decode error.
#[derive(Error, Debug)]
@ -17,12 +24,32 @@ pub enum DecodeError {
#[error("invalid string")]
InvalidString(#[from] str::Utf8Error),
#[error("invalid type: {0:?}")]
InvalidType(VarInt),
#[error("invalid message: {0:?}")]
InvalidMessage(VarInt),
#[error("invalid role: {0:?}")]
InvalidRole(VarInt),
#[error("invalid subscribe location")]
InvalidSubscribeLocation,
#[error("varint bounds exceeded")]
BoundsExceeded(#[from] BoundsExceeded),
// TODO move these to ParamError
#[error("duplicate parameter")]
DupliateParameter,
#[error("missing parameter")]
MissingParameter,
#[error("invalid parameter")]
InvalidParameter,
#[error("io error: {0}")]
IoError(#[from] std::io::Error),
// Used to signal that the stream has ended.
#[error("no more messages")]
Final,
}

6
moq-transport/src/coding/encode.rs
View File

@ -6,6 +6,12 @@ use thiserror::Error;
// TODO Use trait aliases when they're stable, or add these bounds to every method.
pub trait AsyncWrite: tokio::io::AsyncWrite + Unpin + Send {}
impl AsyncWrite for webtransport_quinn::SendStream {}
impl AsyncWrite for Vec<u8> {}
#[async_trait::async_trait]
pub trait Encode: Sized {
async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError>;
}
/// An encode error.
#[derive(Error, Debug)]

2
moq-transport/src/coding/mod.rs
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@ -1,9 +1,11 @@
mod decode;
mod encode;
mod params;
mod string;
mod varint;
pub use decode::*;
pub use encode::*;
pub use params::*;
pub use string::*;
pub use varint::*;

102
moq-transport/src/coding/params.rs
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@ -1,69 +1,85 @@
use std::cmp::min;
use std::io::Cursor;
use std::{cmp::max, collections::HashMap};
use crate::VarInt;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use super::{AsyncRead, AsyncWrite, DecodeError, EncodeError};
use tokio::io::AsyncReadExt;
use crate::coding::{AsyncRead, AsyncWrite, Decode, Encode};
// I hate this parameter encoding so much.
// i hate it i hate it i hate it
use crate::{
coding::{DecodeError, EncodeError},
VarInt,
};
// TODO Use #[async_trait] so we can do Param<VarInt> instead.
pub struct ParamInt(pub VarInt);
#[derive(Default, Debug, Clone)]
pub struct Params(pub HashMap<VarInt, Vec<u8>>);
#[async_trait::async_trait]
impl Decode for Params {
async fn decode<R: AsyncRead>(mut r: &mut R) -> Result<Self, DecodeError> {
let mut params = HashMap::new();
// I hate this shit so much; let me encode my role and get on with my life.
let count = VarInt::decode(r).await?;
for _ in 0..count.into_inner() {
let kind = VarInt::decode(r).await?;
if params.contains_key(&kind) {
return Err(DecodeError::DupliateParameter);
}
impl ParamInt {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
// Why do we have a redundant size in front of each VarInt?
let size = VarInt::decode(r).await?;
let mut take = r.take(size.into_inner());
let value = VarInt::decode(&mut take).await?;
// Like seriously why do I have to check if the VarInt length mismatches.
if take.limit() != 0 {
return Err(DecodeError::InvalidSize);
// Don't allocate the entire requested size to avoid a possible attack
// Instead, we allocate up to 1024 and keep appending as we read further.
let mut pr = r.take(size.into_inner());
let mut buf = Vec::with_capacity(max(1024, pr.limit() as usize));
pr.read_to_end(&mut buf).await?;
params.insert(kind, buf);
r = pr.into_inner();
}
Ok(Self(value))
Ok(Params(params))
}
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
// Seriously why do I have to compute the size.
let size = self.0.size();
VarInt::try_from(size)?.encode(w).await?;
#[async_trait::async_trait]
impl Encode for Params {
async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
VarInt::try_from(self.0.len())?.encode(w).await?;
self.0.encode(w).await?;
for (kind, value) in self.0.iter() {
kind.encode(w).await?;
VarInt::try_from(value.len())?.encode(w).await?;
w.write_all(value).await?;
}
Ok(())
}
}
pub struct ParamBytes(pub Vec<u8>);
impl ParamBytes {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let size = VarInt::decode(r).await?;
let mut take = r.take(size.into_inner());
let mut buf = Vec::with_capacity(min(take.limit() as usize, 1024));
take.read_to_end(&mut buf).await?;
Ok(Self(buf))
impl Params {
pub fn new() -> Self {
Self::default()
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
let size = VarInt::try_from(self.0.len())?;
size.encode(w).await?;
w.write_all(&self.0).await?;
pub async fn set<P: Encode>(&mut self, kind: VarInt, p: P) -> Result<(), EncodeError> {
let mut value = Vec::new();
p.encode(&mut value).await?;
self.0.insert(kind, value);
Ok(())
}
pub fn has(&self, kind: VarInt) -> bool {
self.0.contains_key(&kind)
}
pub struct ParamUnknown {}
impl ParamUnknown {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<(), DecodeError> {
// Really? Is there no way to advance without reading?
ParamBytes::decode(r).await?;
Ok(())
pub async fn get<P: Decode>(&mut self, kind: VarInt) -> Result<Option<P>, DecodeError> {
if let Some(value) = self.0.remove(&kind) {
let mut cursor = Cursor::new(value);
Ok(Some(P::decode(&mut cursor).await?))
} else {
Ok(None)
}
}
}

17
moq-transport/src/coding/string.rs
View File

@ -5,20 +5,25 @@ use tokio::io::{AsyncReadExt, AsyncWriteExt};
use crate::VarInt;
use super::{DecodeError, EncodeError};
use super::{Decode, DecodeError, Encode, EncodeError};
/// Encode a string with a varint length prefix.
pub async fn encode_string<W: AsyncWrite>(s: &str, w: &mut W) -> Result<(), EncodeError> {
let size = VarInt::try_from(s.len())?;
#[async_trait::async_trait]
impl Encode for String {
async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
let size = VarInt::try_from(self.len())?;
size.encode(w).await?;
w.write_all(s.as_ref()).await?;
w.write_all(self.as_ref()).await?;
Ok(())
}
}
#[async_trait::async_trait]
impl Decode for String {
/// Decode a string with a varint length prefix.
pub async fn decode_string<R: AsyncRead>(r: &mut R) -> Result<String, DecodeError> {
async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let size = VarInt::decode(r).await?.into_inner();
let mut str = String::with_capacity(min(1024, size) as usize);
r.take(size).read_to_string(&mut str).await?;
Ok(str)
}
}

28
moq-transport/src/coding/varint.rs
View File

@ -9,7 +9,7 @@ use crate::coding::{AsyncRead, AsyncWrite};
use thiserror::Error;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use super::{DecodeError, EncodeError};
use super::{Decode, DecodeError, Encode, EncodeError};
#[derive(Debug, Copy, Clone, Eq, PartialEq, Error)]
#[error("value out of range")]
@ -164,14 +164,23 @@ impl fmt::Display for VarInt {
}
}
impl VarInt {
#[async_trait::async_trait]
impl Decode for VarInt {
/// Decode a varint from the given reader.
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let mut buf = [0u8; 8];
r.read_exact(buf[0..1].as_mut()).await?;
async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let b = r.read_u8().await?;
Self::decode_byte(b, r).await
}
}
let tag = buf[0] >> 6;
buf[0] &= 0b0011_1111;
impl VarInt {
/// Decode a varint given the first byte, reading the rest as needed.
/// This is silly but useful for determining if the stream has ended.
pub async fn decode_byte<R: AsyncRead>(b: u8, r: &mut R) -> Result<Self, DecodeError> {
let tag = b >> 6;
let mut buf = [0u8; 8];
buf[0] = b & 0b0011_1111;
let x = match tag {
0b00 => u64::from(buf[0]),
@ -192,9 +201,12 @@ impl VarInt {
Ok(Self(x))
}
}
#[async_trait::async_trait]
impl Encode for VarInt {
/// Encode a varint to the given writer.
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
let x = self.0;
if x < 2u64.pow(6) {
w.write_u8(x as u8).await?;

4
moq-transport/src/error.rs
View File

@ -1,5 +1,7 @@
pub trait MoqError {
/// An integer code that is sent over the wire.
fn code(&self) -> u32;
fn reason(&self) -> &str;
/// An optional reason sometimes sent over the wire.
fn reason(&self) -> String;
}

4
moq-transport/src/lib.rs
View File

@ -5,8 +5,8 @@
//! The specification is a work in progress and will change.
//! See the [specification](https://datatracker.ietf.org/doc/draft-ietf-moq-transport/) and [github](https://github.com/moq-wg/moq-transport) for any updates.
//!
//! **FORKED**: This is implementation makes extensive changes to the protocol.
//! See [KIXEL_00](crate::setup::Version::KIXEL_00) for a list of differences.
//! **FORKED**: This implementation makes some changes to the protocol.
//! See [KIXEL_01](crate::setup::Version::KIXEL_01) for a list of differences.
//! Many of these will get merged into the specification, so don't panic.
mod coding;
mod error;

17
moq-transport/src/message/announce.rs
View File

@ -1,22 +1,29 @@
use crate::coding::{decode_string, encode_string, DecodeError, EncodeError};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, Params};
use crate::coding::{AsyncRead, AsyncWrite};
/// Sent by the publisher to announce the availability of a group of tracks.
#[derive(Clone, Debug)]
pub struct Announce {
// The track namespace
/// The track namespace
pub namespace: String,
/// Optional parameters
pub params: Params,
}
impl Announce {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let namespace = decode_string(r).await?;
Ok(Self { namespace })
let namespace = String::decode(r).await?;
let params = Params::decode(r).await?;
Ok(Self { namespace, params })
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
encode_string(&self.namespace, w).await?;
self.namespace.encode(w).await?;
self.params.encode(w).await?;
Ok(())
}
}

6
moq-transport/src/message/announce_ok.rs
View File

@ -1,4 +1,4 @@
use crate::coding::{decode_string, encode_string, AsyncRead, AsyncWrite, DecodeError, EncodeError};
use crate::coding::{AsyncRead, AsyncWrite, Decode, DecodeError, Encode, EncodeError};
/// Sent by the subscriber to accept an Announce.
#[derive(Clone, Debug)]
@ -10,11 +10,11 @@ pub struct AnnounceOk {
impl AnnounceOk {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let namespace = decode_string(r).await?;
let namespace = String::decode(r).await?;
Ok(Self { namespace })
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
encode_string(&self.namespace, w).await
self.namespace.encode(w).await
}
}

14
moq-transport/src/message/announce_reset.rs
View File

@ -1,10 +1,10 @@
use crate::coding::{decode_string, encode_string, DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
use crate::coding::{AsyncRead, AsyncWrite};
/// Sent by the subscriber to reject an Announce.
#[derive(Clone, Debug)]
pub struct AnnounceReset {
pub struct AnnounceError {
// Echo back the namespace that was reset
pub namespace: String,
@ -15,11 +15,11 @@ pub struct AnnounceReset {
pub reason: String,
}
impl AnnounceReset {
impl AnnounceError {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let namespace = decode_string(r).await?;
let namespace = String::decode(r).await?;
let code = VarInt::decode(r).await?.try_into()?;
let reason = decode_string(r).await?;
let reason = String::decode(r).await?;
Ok(Self {
namespace,
@ -29,9 +29,9 @@ impl AnnounceReset {
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
encode_string(&self.namespace, w).await?;
self.namespace.encode(w).await?;
VarInt::from_u32(self.code).encode(w).await?;
encode_string(&self.reason, w).await?;
self.reason.encode(w).await?;
Ok(())
}

6
moq-transport/src/message/go_away.rs
View File

@ -1,4 +1,4 @@
use crate::coding::{decode_string, encode_string, DecodeError, EncodeError};
use crate::coding::{Decode, DecodeError, Encode, EncodeError};
use crate::coding::{AsyncRead, AsyncWrite};
@ -10,11 +10,11 @@ pub struct GoAway {
impl GoAway {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let url = decode_string(r).await?;
let url = String::decode(r).await?;
Ok(Self { url })
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
encode_string(&self.url, w).await
self.url.encode(w).await
}
}

48
moq-transport/src/message/mod.rs
View File

@ -6,16 +6,17 @@
//!
//! Messages sent by the publisher:
//! - [Announce]
//! - [AnnounceReset]
//! - [Unannounce]
//! - [SubscribeOk]
//! - [SubscribeError]
//! - [SubscribeReset]
//! - [Object]
//!
//! Messages sent by the subscriber:
//! - [Subscribe]
//! - [SubscribeStop]
//! - [Unsubscribe]
//! - [AnnounceOk]
//! - [AnnounceStop]
//! - [AnnounceError]
//!
//! Example flow:
//! ```test
@ -32,26 +33,30 @@
mod announce;
mod announce_ok;
mod announce_reset;
mod announce_stop;
mod go_away;
mod object;
mod subscribe;
mod subscribe_error;
mod subscribe_fin;
mod subscribe_ok;
mod subscribe_reset;
mod subscribe_stop;
mod unannounce;
mod unsubscribe;
pub use announce::*;
pub use announce_ok::*;
pub use announce_reset::*;
pub use announce_stop::*;
pub use go_away::*;
pub use object::*;
pub use subscribe::*;
pub use subscribe_error::*;
pub use subscribe_fin::*;
pub use subscribe_ok::*;
pub use subscribe_reset::*;
pub use subscribe_stop::*;
pub use unannounce::*;
pub use unsubscribe::*;
use crate::coding::{DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
use std::fmt;
@ -76,7 +81,7 @@ macro_rules! message_types {
let msg = $name::decode(r).await?;
Ok(Self::$name(msg))
})*
_ => Err(DecodeError::InvalidType(t)),
_ => Err(DecodeError::InvalidMessage(t)),
}
}
@ -127,15 +132,28 @@ macro_rules! message_types {
message_types! {
// NOTE: Object and Setup are in other modules.
// Object = 0x0
// SetupClient = 0x1
// SetupServer = 0x2
// ObjectUnbounded = 0x2
// SetupClient = 0x40
// SetupServer = 0x41
// SUBSCRIBE family, sent by subscriber
Subscribe = 0x3,
Unsubscribe = 0xa,
// SUBSCRIBE family, sent by publisher
SubscribeOk = 0x4,
SubscribeReset = 0x5,
SubscribeStop = 0x15,
SubscribeError = 0x5,
SubscribeFin = 0xb,
SubscribeReset = 0xc,
// ANNOUNCE family, sent by publisher
Announce = 0x6,
Unannounce = 0x9,
// ANNOUNCE family, sent by subscriber
AnnounceOk = 0x7,
AnnounceReset = 0x8,
AnnounceStop = 0x18,
AnnounceError = 0x8,
// Misc
GoAway = 0x10,
}

60
moq-transport/src/message/object.rs
View File

@ -1,9 +1,9 @@
use std::time;
use std::{io, time};
use crate::coding::{DecodeError, EncodeError, VarInt};
use tokio::io::AsyncReadExt;
use crate::coding::{AsyncRead, AsyncWrite};
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
/// Sent by the publisher as the header of each data stream.
#[derive(Clone, Debug)]
@ -13,47 +13,75 @@ pub struct Object {
pub track: VarInt,
// The sequence number within the track.
pub group: VarInt,
// The sequence number within the group.
pub sequence: VarInt,
// The priority, where **larger** values are sent first.
// Proposal: int32 instead of a varint.
pub priority: i32,
// The priority, where **smaller** values are sent first.
pub priority: u32,
// Cache the object for at most this many seconds.
// Zero means never expire.
pub expires: Option<time::Duration>,
/// An optional size, allowing multiple OBJECTs on the same stream.
pub size: Option<VarInt>,
}
impl Object {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let typ = VarInt::decode(r).await?;
if typ.into_inner() != 0 {
return Err(DecodeError::InvalidType(typ));
}
// Try reading the first byte, returning a special error if the stream naturally ended.
let typ = match r.read_u8().await {
Ok(b) => VarInt::decode_byte(b, r).await?,
Err(e) if e.kind() == io::ErrorKind::UnexpectedEof => return Err(DecodeError::Final),
Err(e) => return Err(e.into()),
};
// NOTE: size has been omitted
let size_present = match typ.into_inner() {
0 => false,
2 => true,
_ => return Err(DecodeError::InvalidMessage(typ)),
};
let track = VarInt::decode(r).await?;
let group = VarInt::decode(r).await?;
let sequence = VarInt::decode(r).await?;
let priority = r.read_i32().await?; // big-endian
let priority = VarInt::decode(r).await?.try_into()?;
let expires = match VarInt::decode(r).await?.into_inner() {
0 => None,
secs => Some(time::Duration::from_secs(secs)),
};
// The presence of the size field depends on the type.
let size = match size_present {
true => Some(VarInt::decode(r).await?),
false => None,
};
Ok(Self {
track,
group,
sequence,
priority,
expires,
size,
})
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
VarInt::ZERO.encode(w).await?;
// The kind changes based on the presence of the size.
let kind = match self.size {
Some(_) => VarInt::from_u32(2),
None => VarInt::ZERO,
};
kind.encode(w).await?;
self.track.encode(w).await?;
self.group.encode(w).await?;
self.sequence.encode(w).await?;
w.write_i32(self.priority).await?;
VarInt::from_u32(self.priority).encode(w).await?;
// Round up if there's any decimal points.
let expires = match self.expires {
@ -65,6 +93,10 @@ impl Object {
VarInt::try_from(expires)?.encode(w).await?;
if let Some(size) = self.size {
size.encode(w).await?;
}
Ok(())
}
}

109
moq-transport/src/message/subscribe.rs
View File

@ -1,4 +1,4 @@
use crate::coding::{decode_string, encode_string, DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, Params, VarInt};
use crate::coding::{AsyncRead, AsyncWrite};
@ -7,32 +7,119 @@ use crate::coding::{AsyncRead, AsyncWrite};
/// Objects will use the provided ID instead of the full track name, to save bytes.
#[derive(Clone, Debug)]
pub struct Subscribe {
// An ID we choose so we can map to the track_name.
/// An ID we choose so we can map to the track_name.
// Proposal: https://github.com/moq-wg/moq-transport/issues/209
pub id: VarInt,
// The track namespace.
/// The track namespace.
pub namespace: String,
// The track name.
/// The track name.
pub name: String,
/// The start/end group/object.
pub start_group: SubscribeLocation,
pub start_object: SubscribeLocation,
pub end_group: SubscribeLocation,
pub end_object: SubscribeLocation,
/// Optional parameters
pub params: Params,
}
impl Subscribe {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let id = VarInt::decode(r).await?;
let namespace = decode_string(r).await?;
let name = decode_string(r).await?;
let namespace = String::decode(r).await?;
let name = String::decode(r).await?;
Ok(Self { id, namespace, name })
}
let start_group = SubscribeLocation::decode(r).await?;
let start_object = SubscribeLocation::decode(r).await?;
let end_group = SubscribeLocation::decode(r).await?;
let end_object = SubscribeLocation::decode(r).await?;
// You can't have a start object without a start group.
if start_group == SubscribeLocation::None && start_object != SubscribeLocation::None {
return Err(DecodeError::InvalidSubscribeLocation);
}
// You can't have an end object without an end group.
if end_group == SubscribeLocation::None && end_object != SubscribeLocation::None {
return Err(DecodeError::InvalidSubscribeLocation);
}
// NOTE: There's some more location restrictions in the draft, but they're enforced at a higher level.
let params = Params::decode(r).await?;
Ok(Self {
id,
namespace,
name,
start_group,
start_object,
end_group,
end_object,
params,
})
}
impl Subscribe {
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
self.id.encode(w).await?;
encode_string(&self.namespace, w).await?;
encode_string(&self.name, w).await?;
self.namespace.encode(w).await?;
self.name.encode(w).await?;
self.start_group.encode(w).await?;
self.start_object.encode(w).await?;
self.end_group.encode(w).await?;
self.end_object.encode(w).await?;
self.params.encode(w).await?;
Ok(())
}
}
/// Signal where the subscription should begin, relative to the current cache.
#[derive(Clone, Debug, PartialEq)]
pub enum SubscribeLocation {
None,
Absolute(VarInt),
Latest(VarInt),
Future(VarInt),
}
impl SubscribeLocation {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let kind = VarInt::decode(r).await?;
match kind.into_inner() {
0 => Ok(Self::None),
1 => Ok(Self::Absolute(VarInt::decode(r).await?)),
2 => Ok(Self::Latest(VarInt::decode(r).await?)),
3 => Ok(Self::Future(VarInt::decode(r).await?)),
_ => Err(DecodeError::InvalidSubscribeLocation),
}
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
match self {
Self::None => {
VarInt::from_u32(0).encode(w).await?;
}
Self::Absolute(val) => {
VarInt::from_u32(1).encode(w).await?;
val.encode(w).await?;
}
Self::Latest(val) => {
VarInt::from_u32(2).encode(w).await?;
val.encode(w).await?;
}
Self::Future(val) => {
VarInt::from_u32(3).encode(w).await?;
val.encode(w).await?;
}
}
Ok(())
}

35
moq-transport/src/message/subscribe_error.rs Normal file
View File

@ -0,0 +1,35 @@
use crate::coding::{AsyncRead, AsyncWrite};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
/// Sent by the publisher to reject a Subscribe.
#[derive(Clone, Debug)]
pub struct SubscribeError {
// NOTE: No full track name because of this proposal: https://github.com/moq-wg/moq-transport/issues/209
// The ID for this subscription.
pub id: VarInt,
// An error code.
pub code: u32,
// An optional, human-readable reason.
pub reason: String,
}
impl SubscribeError {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let id = VarInt::decode(r).await?;
let code = VarInt::decode(r).await?.try_into()?;
let reason = String::decode(r).await?;
Ok(Self { id, code, reason })
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
self.id.encode(w).await?;
VarInt::from_u32(self.code).encode(w).await?;
self.reason.encode(w).await?;
Ok(())
}
}

36
moq-transport/src/message/subscribe_fin.rs Normal file
View File

@ -0,0 +1,36 @@
use crate::coding::{AsyncRead, AsyncWrite};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
/// Sent by the publisher to cleanly terminate a Subscribe.
#[derive(Clone, Debug)]
pub struct SubscribeFin {
// NOTE: No full track name because of this proposal: https://github.com/moq-wg/moq-transport/issues/209
/// The ID for this subscription.
pub id: VarInt,
/// The final group/object sent on this subscription.
pub final_group: VarInt,
pub final_object: VarInt,
}
impl SubscribeFin {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let id = VarInt::decode(r).await?;
let final_group = VarInt::decode(r).await?;
let final_object = VarInt::decode(r).await?;
Ok(Self {
id,
final_group,
final_object,
})
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
self.id.encode(w).await?;
self.final_group.encode(w).await?;
self.final_object.encode(w).await?;
Ok(())
}
}

12
moq-transport/src/message/subscribe_ok.rs
View File

@ -1,4 +1,4 @@
use crate::coding::{DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
use crate::coding::{AsyncRead, AsyncWrite};
@ -6,21 +6,25 @@ use crate::coding::{AsyncRead, AsyncWrite};
#[derive(Clone, Debug)]
pub struct SubscribeOk {
// NOTE: No full track name because of this proposal: https://github.com/moq-wg/moq-transport/issues/209
// The ID for this track.
/// The ID for this track.
pub id: VarInt,
/// The subscription will expire in this many milliseconds.
pub expires: VarInt,
}
impl SubscribeOk {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let id = VarInt::decode(r).await?;
Ok(Self { id })
let expires = VarInt::decode(r).await?;
Ok(Self { id, expires })
}
}
impl SubscribeOk {
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
self.id.encode(w).await?;
self.expires.encode(w).await?;
Ok(())
}
}

33
moq-transport/src/message/subscribe_reset.rs
View File

@ -1,35 +1,48 @@
use crate::coding::{decode_string, encode_string, DecodeError, EncodeError, VarInt};
use crate::coding::{AsyncRead, AsyncWrite};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
/// Sent by the publisher to reject a Subscribe.
/// Sent by the publisher to terminate a Subscribe.
#[derive(Clone, Debug)]
pub struct SubscribeReset {
// NOTE: No full track name because of this proposal: https://github.com/moq-wg/moq-transport/issues/209
// The ID for this subscription.
/// The ID for this subscription.
pub id: VarInt,
// An error code.
/// An error code.
pub code: u32,
// An optional, human-readable reason.
/// An optional, human-readable reason.
pub reason: String,
/// The final group/object sent on this subscription.
pub final_group: VarInt,
pub final_object: VarInt,
}
impl SubscribeReset {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let id = VarInt::decode(r).await?;
let code = VarInt::decode(r).await?.try_into()?;
let reason = decode_string(r).await?;
let reason = String::decode(r).await?;
let final_group = VarInt::decode(r).await?;
let final_object = VarInt::decode(r).await?;
Ok(Self { id, code, reason })
Ok(Self {
id,
code,
reason,
final_group,
final_object,
})
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
self.id.encode(w).await?;
VarInt::from_u32(self.code).encode(w).await?;
encode_string(&self.reason, w).await?;
self.reason.encode(w).await?;
self.final_group.encode(w).await?;
self.final_object.encode(w).await?;
Ok(())
}

10
moq-transport/src/message/announce_stop.rs → moq-transport/src/message/unannounce.rs
View File

@ -1,23 +1,23 @@
use crate::coding::{decode_string, encode_string, DecodeError, EncodeError};
use crate::coding::{Decode, DecodeError, Encode, EncodeError};
use crate::coding::{AsyncRead, AsyncWrite};
/// Sent by the publisher to terminate an Announce.
#[derive(Clone, Debug)]
pub struct AnnounceStop {
pub struct Unannounce {
// Echo back the namespace that was reset
pub namespace: String,
}
impl AnnounceStop {
impl Unannounce {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let namespace = decode_string(r).await?;
let namespace = String::decode(r).await?;
Ok(Self { namespace })
}
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
encode_string(&self.namespace, w).await?;
self.namespace.encode(w).await?;
Ok(())
}

8
moq-transport/src/message/subscribe_stop.rs → moq-transport/src/message/unsubscribe.rs
View File

@ -1,24 +1,24 @@
use crate::coding::{DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
use crate::coding::{AsyncRead, AsyncWrite};
/// Sent by the subscriber to terminate a Subscribe.
#[derive(Clone, Debug)]
pub struct SubscribeStop {
pub struct Unsubscribe {
// NOTE: No full track name because of this proposal: https://github.com/moq-wg/moq-transport/issues/209
// The ID for this subscription.
pub id: VarInt,
}
impl SubscribeStop {
impl Unsubscribe {
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let id = VarInt::decode(r).await?;
Ok(Self { id })
}
}
impl SubscribeStop {
impl Unsubscribe {
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
self.id.encode(w).await?;
Ok(())

15
moq-transport/src/session/client.rs
View File

@ -34,20 +34,19 @@ impl Client {
let client = setup::Client {
role,
versions: vec![setup::Version::KIXEL_00].into(),
versions: vec![setup::Version::KIXEL_01].into(),
params: Default::default(),
};
client.encode(&mut control.0).await?;
let server = setup::Server::decode(&mut control.1).await?;
if server.version != setup::Version::KIXEL_00 {
return Err(SessionError::Version(Some(server.version)));
}
// Make sure the server replied with the
if !client.role.is_compatible(server.role) {
return Err(SessionError::RoleIncompatible(client.role, server.role));
if server.version != setup::Version::KIXEL_01 {
return Err(SessionError::Version(
vec![setup::Version::KIXEL_01].into(),
vec![server.version].into(),
));
}
Ok(control)

49
moq-transport/src/session/error.rs
View File

@ -14,8 +14,8 @@ pub enum SessionError {
#[error("decode error: {0}")]
Decode(#[from] coding::DecodeError),
#[error("unsupported version: {0:?}")]
Version(Option<setup::Version>),
#[error("unsupported versions: client={0:?} server={1:?}")]
Version(setup::Versions, setup::Versions),
#[error("incompatible roles: client={0:?} server={1:?}")]
RoleIncompatible(setup::Role, setup::Role),
@ -32,6 +32,18 @@ pub enum SessionError {
#[error("role violation: msg={0}")]
RoleViolation(VarInt),
/// Our enforced stream mapping was disrespected.
#[error("stream mapping conflict")]
StreamMapping,
/// The priority was invalid.
#[error("invalid priority: {0}")]
InvalidPriority(VarInt),
/// The size was invalid.
#[error("invalid size: {0}")]
InvalidSize(VarInt),
/// An unclassified error because I'm lazy. TODO classify these errors
#[error("unknown error: {0}")]
Unknown(String),
@ -44,29 +56,40 @@ impl MoqError for SessionError {
Self::Cache(err) => err.code(),
Self::RoleIncompatible(..) => 406,
Self::RoleViolation(..) => 405,
Self::StreamMapping => 409,
Self::Unknown(_) => 500,
Self::Write(_) => 501,
Self::Read(_) => 502,
Self::Session(_) => 503,
Self::Version(_) => 406,
Self::Version(..) => 406,
Self::Encode(_) => 500,
Self::Decode(_) => 500,
Self::InvalidPriority(_) => 400,
Self::InvalidSize(_) => 400,
}
}
/// A reason that is sent over the wire.
fn reason(&self) -> &str {
fn reason(&self) -> String {
match self {
Self::Cache(err) => err.reason(),
Self::RoleViolation(_) => "role violation",
Self::RoleIncompatible(..) => "role incompatible",
Self::Read(_) => "read error",
Self::Write(_) => "write error",
Self::Session(_) => "session error",
Self::Unknown(_) => "unknown",
Self::Version(_) => "unsupported version",
Self::Encode(_) => "encode error",
Self::Decode(_) => "decode error",
Self::RoleViolation(kind) => format!("role violation for message type {:?}", kind),
Self::RoleIncompatible(client, server) => {
format!(
"role incompatible: client wanted {:?} but server wanted {:?}",
client, server
)
}
Self::Read(err) => format!("read error: {}", err),
Self::Write(err) => format!("write error: {}", err),
Self::Session(err) => format!("session error: {}", err),
Self::Unknown(err) => format!("unknown error: {}", err),
Self::Version(client, server) => format!("unsupported versions: client={:?} server={:?}", client, server),
Self::Encode(err) => format!("encode error: {}", err),
Self::Decode(err) => format!("decode error: {}", err),
Self::StreamMapping => "streaming mapping conflict".to_owned(),
Self::InvalidPriority(priority) => format!("invalid priority: {}", priority),
Self::InvalidSize(size) => format!("invalid size: {}", size),
}
}
}

55
moq-transport/src/session/publisher.rs
View File

@ -85,9 +85,9 @@ impl Publisher {
async fn recv_message(&mut self, msg: &Message) -> Result<(), SessionError> {
match msg {
Message::AnnounceOk(msg) => self.recv_announce_ok(msg).await,
Message::AnnounceStop(msg) => self.recv_announce_stop(msg).await,
Message::AnnounceError(msg) => self.recv_announce_error(msg).await,
Message::Subscribe(msg) => self.recv_subscribe(msg).await,
Message::SubscribeStop(msg) => self.recv_subscribe_stop(msg).await,
Message::Unsubscribe(msg) => self.recv_unsubscribe(msg).await,
_ => Err(SessionError::RoleViolation(msg.id())),
}
}
@ -97,7 +97,7 @@ impl Publisher {
Err(CacheError::NotFound.into())
}
async fn recv_announce_stop(&mut self, _msg: &message::AnnounceStop) -> Result<(), SessionError> {
async fn recv_announce_error(&mut self, _msg: &message::AnnounceError) -> Result<(), SessionError> {
// We didn't send an announce.
Err(CacheError::NotFound.into())
}
@ -115,14 +115,24 @@ impl Publisher {
hash_map::Entry::Vacant(entry) => entry.insert(abort),
};
self.control.send(message::SubscribeOk { id: msg.id }).await
self.control
.send(message::SubscribeOk {
id: msg.id,
expires: VarInt::ZERO,
})
.await
}
async fn reset_subscribe<E: MoqError>(&mut self, id: VarInt, err: E) -> Result<(), SessionError> {
let msg = message::SubscribeReset {
id,
code: err.code(),
reason: err.reason().to_string(),
reason: err.reason(),
// TODO properly populate these
// But first: https://github.com/moq-wg/moq-transport/issues/313
final_group: VarInt::ZERO,
final_object: VarInt::ZERO,
};
self.control.send(msg).await
@ -176,31 +186,42 @@ impl Publisher {
}
async fn run_segment(&self, id: VarInt, segment: &mut segment::Subscriber) -> Result<(), SessionError> {
let object = message::Object {
track: id,
sequence: segment.sequence,
priority: segment.priority,
expires: segment.expires,
};
log::trace!("serving object: {:?}", object);
log::trace!("serving group: {:?}", segment);
let mut stream = self.webtransport.open_uni().await?;
stream.set_priority(object.priority).ok();
// Convert the u32 to a i32, since the Quinn set_priority is signed.
let priority = (segment.priority as i64 - i32::MAX as i64) as i32;
stream.set_priority(priority).ok();
while let Some(mut fragment) = segment.next_fragment().await? {
let object = message::Object {
track: id,
// Properties of the segment
group: segment.sequence,
priority: segment.priority,
expires: segment.expires,
// Properties of the fragment
sequence: fragment.sequence,
size: fragment.size,
};
object
.encode(&mut stream)
.await
.map_err(|e| SessionError::Unknown(e.to_string()))?;
while let Some(data) = segment.read_chunk().await? {
stream.write_chunk(data).await?;
while let Some(chunk) = fragment.read_chunk().await? {
stream.write_all(&chunk).await?;
}
}
Ok(())
}
async fn recv_subscribe_stop(&mut self, msg: &message::SubscribeStop) -> Result<(), SessionError> {
async fn recv_unsubscribe(&mut self, msg: &message::Unsubscribe) -> Result<(), SessionError> {
let abort = self
.subscribes
.lock()

7
moq-transport/src/session/server.rs
View File

@ -18,8 +18,8 @@ impl Server {
client
.versions
.iter()
.find(|version| **version == setup::Version::KIXEL_00)
.ok_or_else(|| SessionError::Version(client.versions.last().cloned()))?;
.find(|version| **version == setup::Version::KIXEL_01)
.ok_or_else(|| SessionError::Version(client.versions.clone(), vec![setup::Version::KIXEL_01].into()))?;
Ok(Request {
session,
@ -63,7 +63,8 @@ impl Request {
async fn send_setup(&mut self, role: setup::Role) -> Result<(), SessionError> {
let server = setup::Server {
role,
version: setup::Version::KIXEL_00,
version: setup::Version::KIXEL_01,
params: Default::default(),
};
// We need to sure we support the opposite of the client's role.

89
moq-transport/src/session/subscriber.rs
View File

@ -6,7 +6,8 @@ use std::{
};
use crate::{
cache::{broadcast, segment, track, CacheError},
cache::{broadcast, fragment, segment, track, CacheError},
coding::DecodeError,
message,
message::Message,
session::{Control, SessionError},
@ -64,28 +65,28 @@ impl Subscriber {
let msg = self.control.recv().await?;
log::info!("message received: {:?}", msg);
if let Err(err) = self.recv_message(&msg).await {
if let Err(err) = self.recv_message(&msg) {
log::warn!("message error: {:?} {:?}", err, msg);
}
}
}
async fn recv_message(&mut self, msg: &Message) -> Result<(), SessionError> {
fn recv_message(&mut self, msg: &Message) -> Result<(), SessionError> {
match msg {
Message::Announce(_) => Ok(()), // don't care
Message::AnnounceReset(_) => Ok(()), // also don't care
Message::SubscribeOk(_) => Ok(()), // guess what, don't care
Message::SubscribeReset(msg) => self.recv_subscribe_reset(msg).await,
Message::Unannounce(_) => Ok(()), // also don't care
Message::SubscribeOk(_msg) => Ok(()), // don't care
Message::SubscribeReset(msg) => self.recv_subscribe_error(msg.id, CacheError::Reset(msg.code)),
Message::SubscribeFin(msg) => self.recv_subscribe_error(msg.id, CacheError::Closed),
Message::SubscribeError(msg) => self.recv_subscribe_error(msg.id, CacheError::Reset(msg.code)),
Message::GoAway(_msg) => unimplemented!("GOAWAY"),
_ => Err(SessionError::RoleViolation(msg.id())),
}
}
async fn recv_subscribe_reset(&mut self, msg: &message::SubscribeReset) -> Result<(), SessionError> {
let err = CacheError::Reset(msg.code);
fn recv_subscribe_error(&mut self, id: VarInt, err: CacheError) -> Result<(), SessionError> {
let mut subscribes = self.subscribes.lock().unwrap();
let subscribe = subscribes.remove(&msg.id).ok_or(CacheError::NotFound)?;
let subscribe = subscribes.remove(&id).ok_or(CacheError::NotFound)?;
subscribe.close(err)?;
Ok(())
@ -107,36 +108,82 @@ impl Subscriber {
async fn run_stream(self, mut stream: RecvStream) -> Result<(), SessionError> {
// Decode the object on the data stream.
let object = message::Object::decode(&mut stream)
let mut object = message::Object::decode(&mut stream)
.await
.map_err(|e| SessionError::Unknown(e.to_string()))?;
log::trace!("received object: {:?}", object);
// A new scope is needed because the async compiler is dumb
let mut publisher = {
let mut segment = {
let mut subscribes = self.subscribes.lock().unwrap();
let track = subscribes.get_mut(&object.track).ok_or(CacheError::NotFound)?;
track.create_segment(segment::Info {
sequence: object.sequence,
sequence: object.group,
priority: object.priority,
expires: object.expires,
})?
};
while let Some(data) = stream.read_chunk(usize::MAX, true).await? {
// Create the first fragment
let mut fragment = segment.create_fragment(fragment::Info {
sequence: object.sequence,
size: object.size,
})?;
let mut remain = object.size.map(usize::from);
loop {
if let Some(0) = remain {
// Decode the next object from the stream.
let next = match message::Object::decode(&mut stream).await {
Ok(next) => next,
// No more objects
Err(DecodeError::Final) => break,
// Unknown error
Err(err) => return Err(err.into()),
};
// NOTE: This is a custom restriction; not part of the moq-transport draft.
// We require every OBJECT to contain the same priority since prioritization is done per-stream.
// We also require every OBJECT to contain the same group so we know when the group ends, and can detect gaps.
if next.priority != object.priority && next.group != object.group {
return Err(SessionError::StreamMapping);
}
// Create a new object.
fragment = segment.create_fragment(fragment::Info {
sequence: object.sequence,
size: object.size,
})?;
object = next;
remain = object.size.map(usize::from);
}
match stream.read_chunk(remain.unwrap_or(usize::MAX), true).await? {
// Unbounded object has ended
None if remain.is_none() => break,
// Bounded object ended early, oops.
None => return Err(DecodeError::UnexpectedEnd.into()),
// NOTE: This does not make a copy!
// Bytes are immutable and ref counted.
publisher.write_chunk(data.bytes)?;
Some(data) => fragment.write_chunk(data.bytes)?,
}
}
Ok(())
}
async fn run_source(mut self) -> Result<(), SessionError> {
loop {
// NOTE: This returns Closed when the source is closed.
while let Some(track) = self.source.next_track().await? {
let track = self.source.next_track().await?;
let name = track.name.clone();
let id = VarInt::from_u32(self.next.fetch_add(1, atomic::Ordering::SeqCst));
@ -146,11 +193,17 @@ impl Subscriber {
id,
namespace: "".to_string(),
name,
// TODO correctly support these
start_group: message::SubscribeLocation::Latest(VarInt::ZERO),
start_object: message::SubscribeLocation::Absolute(VarInt::ZERO),
end_group: message::SubscribeLocation::None,
end_object: message::SubscribeLocation::None,
params: Default::default(),
};
self.control.send(msg).await?;
}
Ok(())
}
}

32
moq-transport/src/setup/client.rs
View File

@ -1,6 +1,6 @@
use super::{Role, Versions};
use crate::{
coding::{DecodeError, EncodeError},
coding::{Decode, DecodeError, Encode, EncodeError, Params},
VarInt,
};
@ -15,29 +15,45 @@ pub struct Client {
pub versions: Versions,
/// Indicate if the client is a publisher, a subscriber, or both.
// Proposal: moq-wg/moq-transport#151
pub role: Role,
/// Unknown parameters.
pub params: Params,
}
impl Client {
/// Decode a client setup message.
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let typ = VarInt::decode(r).await?;
if typ.into_inner() != 1 {
return Err(DecodeError::InvalidType(typ));
if typ.into_inner() != 0x40 {
return Err(DecodeError::InvalidMessage(typ));
}
let versions = Versions::decode(r).await?;
let role = Role::decode(r).await?;
let mut params = Params::decode(r).await?;
Ok(Self { versions, role })
let role = params
.get::<Role>(VarInt::from_u32(0))
.await?
.ok_or(DecodeError::MissingParameter)?;
// Make sure the PATH parameter isn't used
// TODO: This assumes WebTransport support only
if params.has(VarInt::from_u32(1)) {
return Err(DecodeError::InvalidParameter);
}
Ok(Self { versions, role, params })
}
/// Encode a server setup message.
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
VarInt::from_u32(1).encode(w).await?;
VarInt::from_u32(0x40).encode(w).await?;
self.versions.encode(w).await?;
self.role.encode(w).await?;
let mut params = self.params.clone();
params.set(VarInt::from_u32(0), self.role).await?;
params.encode(w).await?;
Ok(())
}

26
moq-transport/src/setup/role.rs
View File

@ -1,6 +1,6 @@
use crate::coding::{AsyncRead, AsyncWrite};
use crate::coding::{DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
/// Indicates the endpoint is a publisher, subscriber, or both.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
@ -36,9 +36,9 @@ impl Role {
impl From<Role> for VarInt {
fn from(r: Role) -> Self {
VarInt::from_u32(match r {
Role::Publisher => 0x0,
Role::Subscriber => 0x1,
Role::Both => 0x2,
Role::Publisher => 0x1,
Role::Subscriber => 0x2,
Role::Both => 0x3,
})
}
}
@ -48,23 +48,27 @@ impl TryFrom<VarInt> for Role {
fn try_from(v: VarInt) -> Result<Self, Self::Error> {
match v.into_inner() {
0x0 => Ok(Self::Publisher),
0x1 => Ok(Self::Subscriber),
0x2 => Ok(Self::Both),
_ => Err(DecodeError::InvalidType(v)),
0x1 => Ok(Self::Publisher),
0x2 => Ok(Self::Subscriber),
0x3 => Ok(Self::Both),
_ => Err(DecodeError::InvalidRole(v)),
}
}
}
impl Role {
#[async_trait::async_trait]
impl Decode for Role {
/// Decode the role.
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let v = VarInt::decode(r).await?;
v.try_into()
}
}
#[async_trait::async_trait]
impl Encode for Role {
/// Encode the role.
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
VarInt::from(*self).encode(w).await
}
}

30
moq-transport/src/setup/server.rs
View File

@ -1,6 +1,6 @@
use super::{Role, Version};
use crate::{
coding::{DecodeError, EncodeError},
coding::{Decode, DecodeError, Encode, EncodeError, Params},
VarInt,
};
@ -17,27 +17,43 @@ pub struct Server {
/// Indicate if the server is a publisher, a subscriber, or both.
// Proposal: moq-wg/moq-transport#151
pub role: Role,
/// Unknown parameters.
pub params: Params,
}
impl Server {
/// Decode the server setup.
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let typ = VarInt::decode(r).await?;
if typ.into_inner() != 2 {
return Err(DecodeError::InvalidType(typ));
if typ.into_inner() != 0x41 {
return Err(DecodeError::InvalidMessage(typ));
}
let version = Version::decode(r).await?;
let role = Role::decode(r).await?;
let mut params = Params::decode(r).await?;
Ok(Self { version, role })
let role = params
.get::<Role>(VarInt::from_u32(0))
.await?
.ok_or(DecodeError::MissingParameter)?;
// Make sure the PATH parameter isn't used
if params.has(VarInt::from_u32(1)) {
return Err(DecodeError::InvalidParameter);
}
Ok(Self { version, role, params })
}
/// Encode the server setup.
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
VarInt::from_u32(2).encode(w).await?;
VarInt::from_u32(0x41).encode(w).await?;
self.version.encode(w).await?;
self.role.encode(w).await?;
let mut params = self.params.clone();
params.set(VarInt::from_u32(0), self.role).await?;
params.encode(w).await?;
Ok(())
}

25
moq-transport/src/setup/version.rs
View File

@ -1,4 +1,4 @@
use crate::coding::{DecodeError, EncodeError, VarInt};
use crate::coding::{Decode, DecodeError, Encode, EncodeError, VarInt};
use crate::coding::{AsyncRead, AsyncWrite};
@ -56,6 +56,19 @@ impl Version {
/// # GROUP
/// - GROUP concept was removed, replaced with OBJECT as a QUIC stream.
pub const KIXEL_00: Version = Version(VarInt::from_u32(0xbad00));
/// Fork of draft-ietf-moq-transport-01.
///
/// Most of the KIXEL_00 changes made it into the draft, or were reverted.
/// Check out the referenced issue on: github.com/moq-wg/moq-transport
///
/// - SUBSCRIBE contains a separate track namespace and track name field (accidental revert). [#277](https://github.com/moq-wg/moq-transport/pull/277)
/// - SUBSCRIBE contains the `track_id` instead of SUBSCRIBE_OK. [#145](https://github.com/moq-wg/moq-transport/issues/145)
/// - SUBSCRIBE_* reference `track_id` the instead of the `track_full_name`. [#145](https://github.com/moq-wg/moq-transport/issues/145)
/// - OBJECT `priority` is still a VarInt, but the max value is a u32 (implementation reasons)
/// - OBJECT `expires` was added, a VarInt in seconds. [#249](https://github.com/moq-wg/moq-transport/issues/249)
/// - OBJECT messages within the same `group` MUST be on the same QUIC stream.
pub const KIXEL_01: Version = Version(VarInt::from_u32(0xbad01));
}
impl From<VarInt> for Version {
@ -88,9 +101,10 @@ impl Version {
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Versions(Vec<Version>);
impl Versions {
#[async_trait::async_trait]
impl Decode for Versions {
/// Decode the version list.
pub async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
async fn decode<R: AsyncRead>(r: &mut R) -> Result<Self, DecodeError> {
let count = VarInt::decode(r).await?.into_inner();
let mut vs = Vec::new();
@ -101,9 +115,12 @@ impl Versions {
Ok(Self(vs))
}
}
#[async_trait::async_trait]
impl Encode for Versions {
/// Encode the version list.
pub async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
async fn encode<W: AsyncWrite>(&self, w: &mut W) -> Result<(), EncodeError> {
let size: VarInt = self.0.len().try_into()?;
size.encode(w).await?;