webrtc

package module
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 Go to latest Published: Mar 12, 2020 License: BSD-3-Clause Imports: 11 Imported by: 13

README

go-webrtc

Build Status

WebRTC for Golang.

Current Status:

As of October 2019, this repository is not actively maintained. The project for which it was developed is now using pion/webrtc instead.

Usage

To immediately see some action, try the chat demo from two machines (or one...)

  • git clone https://github.com/keroserene/go-webrtc
  • cd go-webrtc
  • go run demo/chat/chat.go

Type "start" in one of the Peers, and copy the session descriptions. (This is the "copy-paste" signalling channel). If ICE negotiation succeeds, a really janky chat session should begin.

To write Go code which requires WebRTC functionality:

import "github.com/keroserene/go-webrtc/"

And then you can do things like webrtc.NewPeerConnection(...).

If you've never used WebRTC before, there is already plenty of information online along with javascript examples, but for the Go code here, take a look within demo/* for real usage examples which show how to prepare a PeerConnection and set up the necessary callbacks and signaling.

Also, here are the GoDocs.

Dependencies:
  • GCC 5+
  • TODO:
Package naming

The package name is webrtc, even though the repo name is go-webrtc. (This may be slightly contrary to Go convention, unless we consider the suffix to really begin at the last dash. Reasons:

  • Dashes aren't allowed in package names
  • Including the word "go" in a Go package name seems redundant
  • Just calling this repo webrtc wouldn't make sense either.
  • Also you can rename imported packages to whatever you like.

(e.g. import "foo" "github.com/keroserene/go-webrtc")

Building

Latest tested native webrtc archive: 88f5d9180eae78a6162cccd78850ff416eb82483

There are currently two ways to build gowebrtc: the easy way, and the hard way.

The hard way is to build from scratch, which involves Google's depot_tools and chromium stuff, gclient syncing, which takes a couple hours, and possibly many more if you run into problems... along with writing a custom ninja file and concatenating archives correctly and such.

See webrtc.org native-code dev.

The easy way is to use the pre-built archive I've provided in lib/.

Once the archive is ready, cgo takes care of everything, and building is as easy as go build or go install.

TODO(keroserene): More information / provide a real build script to automate the hard way so it becomes the easy way. (See Issue #23)

Documentation

Overview

Package webrtc/data contains the go wrapper for the Peer-to-Peer Data API portion of WebRTC spec.

See: https://w3c.github.io/webrtc-pc/#idl-def-RTCDataChannel

Package webrtc is a golang wrapper on native code WebRTC.

For consistency with the browser-based WebRTCs, the interface here is based loosely on: w3c.github.io/webrtc-pc

The main goal of this project is to present a golang WebRTC package in the most idiomatic and simple-to-use way.

However, to provide a better experience for users of this package, there are differences inherent in the interface written here and the original native code WebRTC - from the golang requirement of Capitalized identifiers for public interfaces, to the replacement of certain callbacks with goroutines.

Note that building the necessary libwebrtc static library is excessively complicated, which is why the necessary platform-specific archives will be provided in lib/. This also mitigates the possibility that future commits on native libwebrtc will break go-webrtc, because the interface with the native code, through the intermediate CGO layer, is relatively fragile.

Due to other external goals of the developers, this package will only be focused on DataChannels. However, extending this package to allow video/audio media streams and related functionality, to be a "complete" WebRTC suite, is entirely possible and will likely happen in the long term. (Issue #7) This will however have implications for the archives that need to be built and linked.

Please share any improvements or concerns as issues or pull requests on github.

Index

Constants

This section is empty.

Variables

View Source 
var (
	INFO  *log.Logger
	WARN  *log.Logger
	ERROR *log.Logger
	TRACE *log.Logger
)
View Source 
var DCMap = NewCGOMap()
View Source 
var PCMap = NewCGOMap()
View Source 
var SdpTypes = []string{"offer", "pranswer", "answer", "rollback"}

TODO: Turn into Enum.

Functions

func CgoSdpToGoString 

func CgoSdpToGoString(sdp C.CGO_sdp) string

func EnumToStringSafe 

func EnumToStringSafe(value int, valueStrings []string) string

Return a string value for an integer enum from a mapping array or the integer string if the integer it outside the expected range.

func MaxPacketLifeTime 

func MaxPacketLifeTime(maxPacketLifeTime int) func(*DataChannelInit)

MaxPacketLifeTime configures a DataChannels 'maxRetransmitTime' option.

func MaxRetransmits 

func MaxRetransmits(maxRetransmits int) func(*DataChannelInit)

MaxRetransmits configures a DataChannels 'maxRetransmits' option.

func Negotiated 

func Negotiated(negotiated bool) func(*DataChannelInit)

Negotiated configures a DataChannels 'negotiated' option.

func Ordered 

func Ordered(ordered bool) func(*DataChannelInit)

Ordered configures a DataChannels 'ordered' option.

func SetLoggingVerbosity 

func SetLoggingVerbosity(level int)

Logging verbosity level, from 0 (nothing) upwards.

Types

type BundlePolicy 

type BundlePolicy int
const (
	BundlePolicyBalanced BundlePolicy = iota
	BundlePolicyMaxBundle
	BundlePolicyMaxCompat
)

These "Enum" consts must match order in: peerconnectioninterface.h There doesn't seem to be a way to have a named container for enums in go, and the idiomatic way seems to be just prefixes.

func (BundlePolicy) String 

func (p BundlePolicy) String() string

type CGOMap 

type CGOMap struct {
	// contains filtered or unexported fields
}

func NewCGOMap 

func NewCGOMap() CGOMap

func (*CGOMap) Delete 

func (m *CGOMap) Delete(index int)

func (*CGOMap) Get 

func (m *CGOMap) Get(index int) interface{}

func (*CGOMap) Set 

func (m *CGOMap) Set(p interface{}) int

type Configuration 

type Configuration struct {
	IceServers []IceServer
	IceTransportPolicy
	BundlePolicy
	// [ED] RtcpMuxPolicy        RtcpMuxPolicy
	PeerIdentity string // Target peer identity

}

func NewConfiguration 

func NewConfiguration(options ...ConfigurationOption) *Configuration

Create a new Configuration with default values according to spec. Accepts any number of |IceServer|s. Returns nil if there's an error.

func (*Configuration) AddIceServer 

func (config *Configuration) AddIceServer(params ...string) error

type ConfigurationOption 

type ConfigurationOption func(c *Configuration) error

Used in Configuration's variadic functional constructor

func OptionBundlePolicy 

func OptionBundlePolicy(policy BundlePolicy) ConfigurationOption

func OptionIceServer 

func OptionIceServer(params ...string) ConfigurationOption

func OptionIceTransportPolicy 

func OptionIceTransportPolicy(policy IceTransportPolicy) ConfigurationOption

type DataChannel 

type DataChannel struct {
	BufferedAmountLowThreshold int
	BinaryType                 string

	// Event Handlers
	OnOpen              func()
	OnClose             func()
	OnMessage           func([]byte) // byte slice.
	OnBufferedAmountLow func()
	// contains filtered or unexported fields
}
DataChannel

OnError - is not implemented because the underlying Send always returns true as specified for SCTP, there is no reasonable exposure of other specific errors from the native code, and OnClose already covers the bases.

func NewDataChannel 

func NewDataChannel(o unsafe.Pointer) *DataChannel

Create a Go Channel struct, and prepare internal CGO references / observers. The most reasonable place for this to be created is from PeerConnection, which is not available in the subpackage.

func (*DataChannel) BufferedAmount 

func (c *DataChannel) BufferedAmount() int

func (*DataChannel) Close 

func (c *DataChannel) Close() error

func (*DataChannel) ID 

func (c *DataChannel) ID() int

func (*DataChannel) Label 

func (c *DataChannel) Label() string

func (*DataChannel) MaxPacketLifeTime 

func (c *DataChannel) MaxPacketLifeTime() uint

func (*DataChannel) MaxRetransmits 

func (c *DataChannel) MaxRetransmits() uint

func (*DataChannel) Negotiated 

func (c *DataChannel) Negotiated() bool

func (*DataChannel) Ordered 

func (c *DataChannel) Ordered() bool

func (*DataChannel) Protocol 

func (c *DataChannel) Protocol() string

func (*DataChannel) ReadyState 

func (c *DataChannel) ReadyState() DataState

func (*DataChannel) Send 

func (c *DataChannel) Send(data []byte)

Send a message over a DataChannel in binary mode.

func (*DataChannel) SendText 

func (c *DataChannel) SendText(text string)

SendText sends a message over the DataChannel in text mode.

type DataChannelInit 

type DataChannelInit struct {
	Ordered           bool
	MaxPacketLifeTime int
	MaxRetransmits    int
	Protocol          string
	Negotiated        bool
	ID                int
}

type DataState 

type DataState int
const (
	DataStateConnecting DataState = iota
	DataStateOpen
	DataStateClosing
	DataStateClosed
)

func (DataState) String 

func (s DataState) String() string

type IceCandidate 

type IceCandidate struct {
	Candidate     string `json:"candidate"`
	SdpMid        string `json:"sdpMid"`
	SdpMLineIndex int    `json:"sdpMLineIndex"`
}

func DeserializeIceCandidate 

func DeserializeIceCandidate(msg string) *IceCandidate

Deserialize a received json string into an IceCandidate, if possible.

func (*IceCandidate) Serialize 

func (candidate *IceCandidate) Serialize() string

Serialize an IceCandidate into a JSON string.

type IceCandidateType 

type IceCandidateType int
const (
	IceCandidateTypeHost IceCandidateType = iota
	IceCandidateTypeSrflx
	IceCandidateTypePrflx
	IceCandidateTypeRelay
)

func (IceCandidateType) String 

func (t IceCandidateType) String() string

type IceConnectionState 

type IceConnectionState int
const (
	IceConnectionStateNew IceConnectionState = iota
	IceConnectionStateChecking
	IceConnectionStateConnected
	IceConnectionStateCompleted
	IceConnectionStateFailed
	IceConnectionStateDisconnected
	IceConnectionStateClosed
)

func (IceConnectionState) String 

func (s IceConnectionState) String() string

type IceCredentialType 

type IceCredentialType int

type IceGatheringState 

type IceGatheringState int
const (
	IceGatheringStateNew IceGatheringState = iota
	IceGatheringStateGathering
	IceGatheringStateComplete
)

func (IceGatheringState) String 

func (s IceGatheringState) String() string

type IceProtocol 

type IceProtocol int
const (
	IceProtocolUPD IceProtocol = iota
	IceProtocolTCP
)

func (IceProtocol) String 

func (p IceProtocol) String() string

type IceServer 

type IceServer struct {
	Urls       []string // The only "required" element.
	Username   string
	Credential string
}

func NewIceServer 

func NewIceServer(params ...string) (*IceServer, error)

Create a new IceServer object. Expects anywhere from one to three strings, in this order: - comma-separated list of urls. - username - credential TODO: For the ED version, may need to support CredentialType.

type IceTcpCandidateType 

type IceTcpCandidateType int
const (
	IceTcpCandidateTypeActive IceTcpCandidateType = iota
	IceTcpCandidateTypePassive
	IceTcpCandidateTypeSo
)

func (IceTcpCandidateType) String 

func (t IceTcpCandidateType) String() string

type IceTransportPolicy 

type IceTransportPolicy int
const (
	IceTransportPolicyNone IceTransportPolicy = iota
	IceTransportPolicyRelay

	IceTransportPolicyAll
)

func (IceTransportPolicy) String 

func (p IceTransportPolicy) String() string

type PeerConnection 

type PeerConnection struct {

	// Event handlers
	OnNegotiationNeeded        func()
	OnIceCandidate             func(IceCandidate)
	OnIceCandidateError        func()
	OnSignalingStateChange     func(SignalingState)
	OnIceConnectionStateChange func(IceConnectionState)
	OnIceGatheringStateChange  func(IceGatheringState)
	OnConnectionStateChange    func(PeerConnectionState)
	OnDataChannel              func(*DataChannel)
	// contains filtered or unexported fields
}
WebRTC PeerConnection

This is the main container of WebRTC functionality - from handling the ICE negotiation to setting up Data Channels.

See: https://w3c.github.io/webrtc-pc/#idl-def-RTCPeerConnection

func NewPeerConnection 

func NewPeerConnection(config *Configuration) (*PeerConnection, error)
Construct a WebRTC PeerConnection.

For a successful connection, provide at least one ICE server (stun or turn) in the |Configuration| struct.

func (*PeerConnection) AddIceCandidate 

func (pc *PeerConnection) AddIceCandidate(ic IceCandidate) error

func (*PeerConnection) Close 

func (pc *PeerConnection) Close() error

func (*PeerConnection) ConnectionState 

func (pc *PeerConnection) ConnectionState() PeerConnectionState

readonly connectionState

func (*PeerConnection) CreateAnswer 

func (pc *PeerConnection) CreateAnswer() (*SessionDescription, error)

CreateAnswer prepares an SDP "answer" message. This should only happen in response to an offer received and set as the remote description. Once generated, this answer should then be set as the local description and sent back over the signaling channel to the remote peer.

This method is blocking, and should occur within a separate goroutine.

func (*PeerConnection) CreateDataChannel 

func (pc *PeerConnection) CreateDataChannel(label string, options ...func(*DataChannelInit)) (
	*DataChannel, error)

func (*PeerConnection) CreateOffer 

func (pc *PeerConnection) CreateOffer() (*SessionDescription, error)

CreateOffer prepares an SDP "offer" message, which should be set as the local description, then sent to the remote peer over a signalling channel. This should only be called by the peer initiating the connection.

This method is blocking, and should occur within a separate goroutine.

func (*PeerConnection) DeleteDataChannel 

func (pc *PeerConnection) DeleteDataChannel(dc *DataChannel)

func (*PeerConnection) Destroy 

func (pc *PeerConnection) Destroy() error

func (*PeerConnection) GetConfiguration 

func (pc *PeerConnection) GetConfiguration() Configuration

func (*PeerConnection) IceConnectionState 

func (pc *PeerConnection) IceConnectionState() IceConnectionState

readonly iceconnectionState

func (*PeerConnection) IceGatheringState 

func (pc *PeerConnection) IceGatheringState() IceGatheringState

readonly icegatheringstatee

func (*PeerConnection) LocalDescription 

func (pc *PeerConnection) LocalDescription() (sdp *SessionDescription)

readonly localDescription

func (*PeerConnection) RemoteDescription 

func (pc *PeerConnection) RemoteDescription() (sdp *SessionDescription)

readonly remoteDescription

func (*PeerConnection) SetConfiguration 

func (pc *PeerConnection) SetConfiguration(config Configuration) error

func (*PeerConnection) SetLocalDescription 

func (pc *PeerConnection) SetLocalDescription(sdp *SessionDescription) error

Set a |SessionDescription| as the local description. The description should be generated from the local peer's CreateOffer or CreateAnswer, and not be a description received over the signaling channel.

func (*PeerConnection) SetRemoteDescription 

func (pc *PeerConnection) SetRemoteDescription(sdp *SessionDescription) error

Set a |SessionDescription| as the remote description. This description should be one generated by the remote peer's CreateOffer or CreateAnswer, received over the signaling channel, and not a description created locally.

If the local peer is the answerer, this must be called before CreateAnswer.

func (*PeerConnection) SignalingState 

func (pc *PeerConnection) SignalingState() SignalingState

readonly signalingState

type PeerConnectionState 

type PeerConnectionState int
const (
	PeerConnectionStateNew PeerConnectionState = iota
	PeerConnectionStateConnecting
	PeerConnectionStateConnected
	PeerConnectionStateDisconnected
	PeerConnectionStateFailed
)

func (PeerConnectionState) String 

func (s PeerConnectionState) String() string

type RtcpMuxPolicy 

type RtcpMuxPolicy int

type SessionDescription 

type SessionDescription struct {
	Type string `json:"type"`
	Sdp  string `json:"sdp"`
}
WebRTC SessionDescription

See: https://w3c.github.io/webrtc-pc/#idl-def-RTCSessionDescription

func DeserializeSessionDescription 

func DeserializeSessionDescription(msg string) *SessionDescription

Deserialize a received json string into a SessionDescription, if possible.

func NewSessionDescription 

func NewSessionDescription(sdpType string, serializedSDP C.CGO_sdpString) *SessionDescription

Construct a SessionDescription object from a valid msg.

func (*SessionDescription) GoStringToCgoSdp 

func (desc *SessionDescription) GoStringToCgoSdp() C.CGO_sdp

func (*SessionDescription) Serialize 

func (desc *SessionDescription) Serialize() string

Serialize a SessionDescription into a JSON string.

type SignalingState 

type SignalingState int
const (
	SignalingStateStable SignalingState = iota
	SignalingStateHaveLocalOffer
	SignalingStateHaveLocalPrAnswer
	SignalingStateHaveRemoteOffer
	SignalingStateHaveRemotePrAnswer
	SignalingStateClosed
)

func (SignalingState) String 

func (s SignalingState) String() string

Source Files

View all Source files

Directories

Path Synopsis
* Basic webrtc demo, two local clients speaking over go, to show the most basic * usage of webrtc in Go.
 * Basic webrtc demo, two local clients speaking over go, to show the most basic * usage of webrtc in Go.
chat
* Webrtc chat demo.
 * Webrtc chat demo.

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