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//! Client API protocol implementation for Medea media server. //! //! # Features //! //! - `jason`: Enables [`Deserialize`] implementation for [`Event`]s, and //! [`Serialize`] implementation for [`Command`]s. //! - `medea`: Enables [`Deserialize`] implementation for [`Command`]s, and //! [`Serialize`] implementation for [`Event`]s. //! - `extended-stats`: Enables unused RTC Stats DTOs. //! //! # Contribution guide //! //! Avoid using 64 bit types. [`medea-jason`] uses [wasm-bindgen] to interop //! with JS, and exposing 64 bit types to JS will make [wasm-bindgen] to use //! [BigInt64Array][2] / [BigUint64Array][3] in its JS glue, which are not //! implemented or were implemented too recently in some UAs. //! //! So its better to keep protocol 64-bit-types-clean to avoid things breaking //! by accident. //! //! [`medea-jason`]: https://docs.rs/medea-jason //! [wasm-bindgen]: https://github.com/rustwasm/wasm-bindgen //! [2]: https://tinyurl.com/y8bacb93 //! [3]: https://tinyurl.com/y4j3b4cs #![cfg_attr(docsrs, feature(doc_cfg))] #![deny(broken_intra_doc_links)] #![forbid(unsafe_code)] pub mod state; pub mod stats; use std::collections::HashMap; use derive_more::{Constructor, Display, From}; use medea_macro::dispatchable; use serde::{Deserialize, Serialize}; use self::stats::RtcStat; /// ID of `Room`. #[derive( Clone, Debug, Serialize, Deserialize, Eq, Hash, PartialEq, From, Display, )] #[from(forward)] pub struct RoomId(pub String); /// ID of `Member`. #[derive( Clone, Debug, Serialize, Deserialize, Eq, Hash, PartialEq, From, Display, )] #[from(forward)] pub struct MemberId(pub String); /// ID of `Peer`. #[cfg_attr( feature = "medea", derive(Deserialize, Debug, Hash, Eq, Default, PartialEq) )] #[cfg_attr(feature = "jason", derive(Serialize))] #[derive(Clone, Copy, Display)] pub struct PeerId(pub u32); /// ID of `MediaTrack`. #[cfg_attr( feature = "medea", derive(Deserialize, Debug, Hash, Eq, Default, PartialEq) )] #[cfg_attr(feature = "jason", derive(Serialize))] #[derive(Clone, Copy, Display)] pub struct TrackId(pub u32); /// Credential used for `Member` authentication. #[derive( Clone, Debug, Deserialize, Display, Eq, From, Hash, PartialEq, Serialize, )] #[from(forward)] pub struct Credential(pub String); /// Value that is able to be incremented by `1`. #[cfg(feature = "medea")] pub trait Incrementable { /// Returns current value + 1. #[must_use] fn incr(&self) -> Self; } /// Implements [`Incrementable`] trait for newtype with any numeric type. macro_rules! impl_incrementable { ($name:ty) => { impl Incrementable for $name { #[inline] fn incr(&self) -> Self { Self(self.0 + 1) } } }; } #[cfg(feature = "medea")] impl_incrementable!(PeerId); #[cfg(feature = "medea")] impl_incrementable!(TrackId); #[cfg_attr(feature = "medea", derive(Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Debug, Eq, PartialEq)] #[serde(tag = "msg", content = "data")] /// Message sent by `Media Server` to `Client`. pub enum ServerMsg { /// `ping` message that `Media Server` is expected to send to `Client` /// periodically for probing its aliveness. Ping(u32), /// `Media Server` notifies `Client` about happened facts and it reacts on /// them to reach the proper state. Event { /// ID of `Room` that this [`Event`] is associated with. room_id: RoomId, /// Actual [`Event`] sent to `Client`. event: Event, }, /// `Media Server` notifies `Client` about necessity to update its RPC /// settings. RpcSettings(RpcSettings), } #[cfg_attr(feature = "medea", derive(Deserialize))] #[cfg_attr(feature = "jason", derive(Serialize))] #[derive(Clone, Debug, PartialEq)] /// Message from 'Client' to 'Media Server'. pub enum ClientMsg { /// `pong` message that `Client` answers with to `Media Server` in response /// to received [`ServerMsg::Ping`]. Pong(u32), /// Request of `Client` to change the state on `Media Server`. Command { /// ID of `Room` that this [`Command`] is associated with. room_id: RoomId, /// Actual [`Command`] sent to `Media Server`. command: Command, }, } /// RPC settings of `Client` received from `Media Server`. #[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)] pub struct RpcSettings { /// Timeout of considering `Client` as lost by `Media Server` when it /// doesn't receive [`ClientMsg::Pong`]. /// /// Unit: millisecond. pub idle_timeout_ms: u32, /// Interval that `Media Server` sends [`ServerMsg::Ping`] with. /// /// Unit: millisecond. pub ping_interval_ms: u32, } /// WebSocket message from Web Client to Media Server. #[dispatchable] #[cfg_attr(feature = "medea", derive(Deserialize))] #[cfg_attr(feature = "jason", derive(Serialize))] #[serde(tag = "command", content = "data")] #[derive(Clone, Debug, PartialEq)] pub enum Command { /// Request of `Client` to join `Room`. JoinRoom { /// ID of `Member` with which [`Credential`] `Client` want to join. member_id: MemberId, /// [`Credential`] of `Client`'s `Member`. credential: Credential, }, /// Request of `Client` to leave `Room`. LeaveRoom { /// ID of leaving `Member`. member_id: MemberId, }, /// Web Client sends SDP Offer. MakeSdpOffer { /// ID of the `Peer` for which Web Client sends SDP Offer. peer_id: PeerId, /// SDP Offer of the `Peer`. sdp_offer: String, /// Associations between [`Track`] and transceiver's /// [media description][1]. /// /// `mid` is basically an ID of [`m=<media>` section][1] in SDP. /// /// [1]: https://tools.ietf.org/html/rfc4566#section-5.14 mids: HashMap<TrackId, String>, /// Statuses of `Peer` transceivers. transceivers_statuses: HashMap<TrackId, bool>, }, /// Web Client sends SDP Answer. MakeSdpAnswer { /// ID of the `Peer` for which Web Client sends SDP Answer. peer_id: PeerId, /// SDP Answer of the `Peer`. sdp_answer: String, /// Statuses of `Peer` transceivers. transceivers_statuses: HashMap<TrackId, bool>, }, /// Web Client sends Ice Candidate. SetIceCandidate { peer_id: PeerId, candidate: IceCandidate, }, /// Web Client sends Peer Connection metrics. AddPeerConnectionMetrics { peer_id: PeerId, metrics: PeerMetrics, }, /// Web Client asks permission to update [`Track`]s in specified Peer. /// Media Server gives permission by sending [`Event::PeerUpdated`]. UpdateTracks { peer_id: PeerId, tracks_patches: Vec<TrackPatchCommand>, }, /// Web Client asks Media Server to synchronize Client State with a Server /// State. SynchronizeMe { state: state::Room }, } /// Web Client's Peer Connection metrics. #[cfg_attr(feature = "medea", derive(Deserialize))] #[cfg_attr(feature = "jason", derive(Serialize))] #[derive(Clone, Debug, PartialEq)] pub enum PeerMetrics { /// Peer Connection's ICE connection state. IceConnectionState(IceConnectionState), /// Peer Connection's connection state. PeerConnectionState(PeerConnectionState), /// Peer Connection's RTC stats. RtcStats(Vec<RtcStat>), } /// Peer Connection's ICE connection state. #[cfg_attr(feature = "medea", derive(Deserialize))] #[cfg_attr(feature = "jason", derive(Serialize))] #[derive(Clone, Debug, PartialEq)] pub enum IceConnectionState { /// ICE agent is gathering addresses or is waiting to be given remote /// candidates. New, /// ICE agent has been given one or more remote candidates and is checking /// pairs of local and remote candidates against one another to try to find /// a compatible match, but hasn't yet found a pair which will allow the /// `PeerConnection` to be made. It's possible that gathering of candidates /// is also still underway. Checking, /// Usable pairing of local and remote candidates has been found for all /// components of the connection, and the connection has been established. /// It's possible that gathering is still underway, and it's also possible /// that the ICE agent is still checking candidates against one another /// looking for a better connection to use. Connected, /// ICE agent has finished gathering candidates, has checked all pairs /// against one another, and has found a connection for all components. Completed, /// ICE candidate has checked all candidates pairs against one another and /// has failed to find compatible matches for all components of the /// connection. It is, however, possible that the ICE agent did find /// compatible connections for some components. Failed, /// Checks to ensure that components are still connected failed for at /// least one component of the `PeerConnection`. This is a less stringent /// test than [`IceConnectionState::Failed`] and may trigger intermittently /// and resolve just as spontaneously on less reliable networks, or during /// temporary disconnections. When the problem resolves, the connection may /// return to the [`IceConnectionState::Connected`] state. Disconnected, /// ICE agent for this `PeerConnection` has shut down and is no longer /// handling requests. Closed, } /// Peer Connection's connection state. #[cfg_attr(feature = "medea", derive(Deserialize))] #[cfg_attr(feature = "jason", derive(Serialize))] #[derive(Clone, Copy, Debug, Eq, PartialEq)] pub enum PeerConnectionState { /// At least one of the connection's ICE transports are in the /// [`IceConnectionState::New`] state, and none of them are in one /// of the following states: [`IceConnectionState::Checking`], /// [`IceConnectionState::Failed`], or /// [`IceConnectionState::Disconnected`], or all of the connection's /// transports are in the [`IceConnectionState::Closed`] state. New, /// One or more of the ICE transports are currently in the process of /// establishing a connection; that is, their [`IceConnectionState`] is /// either [`IceConnectionState::Checking`] or /// [`IceConnectionState::Connected`], and no transports are in the /// [`IceConnectionState::Failed`] state. Connecting, /// Every ICE transport used by the connection is either in use (state /// [`IceConnectionState::Connected`] or [`IceConnectionState::Completed`]) /// or is closed ([`IceConnectionState::Closed`]); in addition, /// at least one transport is either [`IceConnectionState::Connected`] or /// [`IceConnectionState::Completed`]. Connected, /// At least one of the ICE transports for the connection is in the /// [`IceConnectionState::Disconnected`] state and none of the other /// transports are in the state [`IceConnectionState::Failed`] or /// [`IceConnectionState::Checking`]. Disconnected, /// One or more of the ICE transports on the connection is in the /// [`IceConnectionState::Failed`] state. Failed, /// The `PeerConnection` is closed. Closed, } impl From<IceConnectionState> for PeerConnectionState { fn from(ice_con_state: IceConnectionState) -> Self { use IceConnectionState as IceState; match ice_con_state { IceState::New => Self::New, IceState::Checking => Self::Connecting, IceState::Connected | IceState::Completed => Self::Connected, IceState::Failed => Self::Failed, IceState::Disconnected => Self::Disconnected, IceState::Closed => Self::Closed, } } } /// Reason of disconnecting Web Client from Media Server. #[derive( Copy, Clone, Debug, Deserialize, Display, Serialize, Eq, PartialEq, )] pub enum CloseReason { /// Client session was finished on a server side. Finished, /// Old connection was closed due to a client reconnection. Reconnected, /// Connection has been inactive for a while and thus considered idle /// by a server. Idle, /// Establishing of connection with a server was rejected on server side. /// /// Most likely because of incorrect Member credentials. Rejected, /// Server internal error has occurred while connecting. /// /// This close reason is similar to 500 HTTP status code. InternalError, /// Client was evicted on the server side. Evicted, } /// Description which is sent in [Close] WebSocket frame from Media Server /// to Web Client. /// /// [Close]: https://tools.ietf.org/html/rfc6455#section-5.5.1 #[derive(Constructor, Debug, Deserialize, Eq, PartialEq, Serialize)] pub struct CloseDescription { /// Reason of why WebSocket connection has been closed. pub reason: CloseReason, } /// WebSocket message from Medea to Jason. #[dispatchable(self: &Self, async_trait(?Send))] #[cfg_attr(feature = "medea", derive(Clone, Debug, Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[serde(tag = "event", content = "data")] pub enum Event { /// `Media Server` notifies `Client` that he joined `Room`. RoomJoined { /// ID of `Member` which joined `Room`. member_id: MemberId, }, /// `Media Server` notifies `Client` that he left `Room`. RoomLeft { /// [`CloseReason`] with which `Client` was left. close_reason: CloseReason, }, /// Media Server notifies Web Client about necessity of RTCPeerConnection /// creation. PeerCreated { peer_id: PeerId, negotiation_role: NegotiationRole, tracks: Vec<Track>, ice_servers: Vec<IceServer>, force_relay: bool, }, /// Media Server notifies Web Client about necessity to apply specified SDP /// Answer to Web Client's RTCPeerConnection. SdpAnswerMade { peer_id: PeerId, sdp_answer: String }, /// Media Server notifies Web Client that his SDP offer was applied. LocalDescriptionApplied { peer_id: PeerId, sdp_offer: String }, /// Media Server notifies Web Client about necessity to apply specified /// ICE Candidate. IceCandidateDiscovered { peer_id: PeerId, candidate: IceCandidate, }, /// Media Server notifies Web Client about necessity of RTCPeerConnection /// close. PeersRemoved { peer_ids: Vec<PeerId> }, /// Media Server notifies about necessity to update [`Track`]s in specified /// `Peer`. PeerUpdated { /// [`PeerId`] of `Peer` where [`Track`]s should be updated. peer_id: PeerId, /// List of [`PeerUpdate`]s which should be applied. updates: Vec<PeerUpdate>, /// Negotiation role basing on which should be sent /// [`Command::MakeSdpOffer`] or [`Command::MakeSdpAnswer`]. /// /// If `None` then no (re)negotiation should be done. negotiation_role: Option<NegotiationRole>, }, /// Media Server notifies about connection quality score update. ConnectionQualityUpdated { /// Partner [`MemberId`] of the `Peer`. partner_member_id: MemberId, /// Estimated connection quality. quality_score: ConnectionQualityScore, }, /// Media Server synchronizes Web Client about State synchronization. StateSynchronized { state: state::Room }, } /// `Peer`'s negotiation role. /// /// Some [`Event`]s can trigger SDP negotiation. /// - If [`Event`] contains [`NegotiationRole::Offerer`], then `Peer` is /// expected to create SDP Offer and send it via [`Command::MakeSdpOffer`]. /// - If [`Event`] contains [`NegotiationRole::Answerer`], then `Peer` is /// expected to apply provided SDP Offer and provide its SDP Answer in a /// [`Command::MakeSdpAnswer`]. #[cfg_attr(feature = "medea", derive(Clone, Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Debug)] pub enum NegotiationRole { /// [`Command::MakeSdpOffer`] should be sent by client. Offerer, /// [`Command::MakeSdpAnswer`] should be sent by client. Answerer(String), } /// [`Track`] update which should be applied to the `Peer`. #[cfg_attr(feature = "medea", derive(Clone, Debug, Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] pub enum PeerUpdate { /// New [`Track`] should be added to the `Peer`. Added(Track), /// [`Track`] with the provided [`TrackId`] should be removed from the /// `Peer`. /// /// Can only refer [`Track`]s already known to the `Peer`. Removed(TrackId), /// [`Track`] should be updated by this [`TrackPatchEvent`] in the `Peer`. /// Can only refer tracks already known to the `Peer`. Updated(TrackPatchEvent), /// `Peer` should start ICE restart process on the next renegotiation. IceRestart, } /// Represents [RTCIceCandidateInit][1] object. /// /// [1]: https://www.w3.org/TR/webrtc/#dom-rtcicecandidateinit #[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)] pub struct IceCandidate { pub candidate: String, pub sdp_m_line_index: Option<u16>, pub sdp_mid: Option<String>, } /// [`Track`] with specified direction. #[cfg_attr(feature = "medea", derive(Clone, Debug, Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] pub struct Track { pub id: TrackId, pub direction: Direction, pub media_type: MediaType, } impl Track { /// Indicates whether this [`Track`] is required to call starting. #[must_use] pub fn required(&self) -> bool { self.media_type.required() } } /// Patch of the [`Track`] which Web Client can request with /// [`Command::UpdateTracks`]. #[cfg_attr(feature = "medea", derive(Clone, Debug, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Eq, PartialEq)] pub struct TrackPatchCommand { pub id: TrackId, pub enabled: Option<bool>, pub muted: Option<bool>, } /// Patch of the [`Track`] which Media Server can send with /// [`Event::PeerUpdated`]. #[cfg_attr(feature = "medea", derive(Clone, Debug, Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] pub struct TrackPatchEvent { /// ID of the [`Track`] which should be patched. pub id: TrackId, /// Media exchange state of the concrete `Member`. /// /// This state doesn't indicates that connection between two `Member`s are /// really disabled. This is intention of this `Member`. pub enabled_individual: Option<bool>, /// Media exchange state of the connection between `Member`s. /// /// This state indicates real media exchange state between `Member`s. But /// this state doesn't changes intention of this `Member`. /// /// So intention of this `Member` (`enabled_individual`) can be /// `false`, but real media exchange state can be `true`. pub enabled_general: Option<bool>, /// `Track` mute state. Muting and unmuting can be performed without adding /// / removing tracks from transceivers, hence renegotiation is not /// required. pub muted: Option<bool>, } impl From<TrackPatchCommand> for TrackPatchEvent { fn from(from: TrackPatchCommand) -> Self { Self { id: from.id, enabled_individual: from.enabled, enabled_general: None, muted: from.muted, } } } impl TrackPatchEvent { /// Returns new empty [`TrackPatchEvent`] with a provided [`TrackId`]. #[inline] #[must_use] pub fn new(id: TrackId) -> Self { Self { id, enabled_general: None, enabled_individual: None, muted: None, } } /// Merges this [`TrackPatchEvent`] with a provided [`TrackPatchEvent`]. /// /// Does nothing if [`TrackId`] of this [`TrackPatchEvent`] and the /// provided [`TrackPatchEvent`] are different. pub fn merge(&mut self, another: &Self) { if self.id != another.id { return; } if let Some(enabled_general) = another.enabled_general { self.enabled_general = Some(enabled_general); } if let Some(enabled_individual) = another.enabled_individual { self.enabled_individual = Some(enabled_individual); } if let Some(muted) = another.muted { self.muted = Some(muted); } } } /// Representation of [RTCIceServer][1] (item of `iceServers` field /// from [RTCConfiguration][2]). /// /// [1]: https://developer.mozilla.org/en-US/docs/Web/API/RTCIceServer /// [2]: https://developer.mozilla.org/en-US/docs/Web/API/RTCConfiguration #[derive(Clone, Debug)] #[cfg_attr(feature = "medea", derive(Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] pub struct IceServer { pub urls: Vec<String>, #[serde(skip_serializing_if = "Option::is_none")] pub username: Option<String>, #[serde(skip_serializing_if = "Option::is_none")] pub credential: Option<String>, } /// Direction of [`Track`]. #[cfg_attr(feature = "medea", derive(Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Debug)] // TODO: Use different struct without mids in PeerUpdated event. pub enum Direction { Send { receivers: Vec<MemberId>, mid: Option<String>, }, Recv { sender: MemberId, mid: Option<String>, }, } /// Type of [`Track`]. #[cfg_attr(feature = "medea", derive(Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Debug)] pub enum MediaType { Audio(AudioSettings), Video(VideoSettings), } impl MediaType { /// Returns `true` if this [`MediaType`] is required to call starting. #[must_use] pub fn required(&self) -> bool { match self { MediaType::Audio(audio) => audio.required, MediaType::Video(video) => video.required, } } } #[cfg_attr(feature = "medea", derive(Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Debug)] pub struct AudioSettings { /// Importance of the audio media type. /// /// If `false` then audio may be not published. pub required: bool, } #[cfg_attr(feature = "medea", derive(Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Debug)] pub struct VideoSettings { /// Importance of the video media type. /// /// If `false` then video may be not published. pub required: bool, /// Source kind of this [`VideoSettings`] media. pub source_kind: MediaSourceKind, } /// Media source kind. #[cfg_attr(feature = "medea", derive(Debug, Eq, PartialEq, Serialize))] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Copy)] pub enum MediaSourceKind { /// Media is sourced by some media device (webcam or microphone). Device, /// Media is obtained with screen-capture. Display, } /// Estimated connection quality. #[cfg_attr( feature = "medea", derive(Serialize, Display, Eq, Ord, PartialEq, PartialOrd) )] #[cfg_attr(feature = "jason", derive(Deserialize))] #[derive(Clone, Copy, Debug)] pub enum ConnectionQualityScore { /// Nearly all users dissatisfied. Poor = 1, /// Many users dissatisfied. Low = 2, /// Some users dissatisfied. Medium = 3, /// Satisfied. High = 4, } #[cfg(test)] mod test { use super::*; #[test] fn track_patch_merge() { for (track_patches, result) in vec![ ( vec![ TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, TrackPatchEvent { id: TrackId(1), enabled_general: Some(false), enabled_individual: Some(false), muted: None, }, TrackPatchEvent { id: TrackId(1), enabled_general: None, enabled_individual: None, muted: None, }, TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, ], TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, ), ( vec![ TrackPatchEvent { id: TrackId(1), enabled_general: None, enabled_individual: None, muted: None, }, TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, ], TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, ), ( vec![ TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, TrackPatchEvent { id: TrackId(1), enabled_general: None, enabled_individual: None, muted: None, }, ], TrackPatchEvent { id: TrackId(1), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, ), ( vec![ TrackPatchEvent { id: TrackId(1), enabled_general: None, enabled_individual: None, muted: None, }, TrackPatchEvent { id: TrackId(2), enabled_general: Some(true), enabled_individual: Some(true), muted: None, }, ], TrackPatchEvent { id: TrackId(1), enabled_general: None, enabled_individual: None, muted: None, }, ), ] { let mut merge_track_patch = TrackPatchEvent::new(TrackId(1)); for track_patch in &track_patches { merge_track_patch.merge(track_patch); } assert_eq!( result, merge_track_patch, "track patches: {:?}", track_patches ); } } }