signalling.h File Reference

Out-of-band signalling used to negotiate WebRTC peer connections. More...

#include <functional>
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include <absl/status/status.h>
#include <absl/status/statusor.h>
#include "a11/concurrency/future.h"

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Classes
struct	a11::net::SignallingMessage
	One signalling payload: an SDP description, an ICE candidate, or an error. More...
class	a11::net::SignallingTransport
	Abstract identity-bound channel over which signalling flows. More...
class	a11::net::SignallingEndpoint
	An identity-bound endpoint into an in-process SignallingService. More...
class	a11::net::SignallingService
	An in-process broker that routes signalling messages by identity. More...

Namespaces
namespace	a11
namespace	a11::net

Typedefs
using	a11::net::OnSignallingMessage = std::function< a11::Task(SignallingMessage message)>
	Async callback invoked for each inbound SignallingMessage.

Enumerations
enum class	a11::net::SignallingMessageType { a11::net::kDescription , a11::net::kCandidate , a11::net::kError }
	The kind of payload a SignallingMessage carries. More...

Detailed Description

Out-of-band signalling used to negotiate WebRTC peer connections.

Signalling is the handshake that lets two peers find each other and agree on how to connect before a data transport exists – chiefly to exchange the SDP offers/answers and ICE candidates a WebRtcWireStream needs. A SignallingService routes SignallingMessage values between identity-bound SignallingEndpoints in one process; SignallingTransport is the abstract channel a WebRTC stream negotiates over, with a WebSocket-backed implementation in websocket_signalling.h for peers on different machines. This is not itself a WireStream transport – it carries control messages, not A11 WireMessage traffic.