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janus.go
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janus.go
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// Package janus is a Golang implementation of the Janus API, used to interact
// with the Janus WebRTC Gateway.
package janus
import (
"bytes"
"encoding/json"
"fmt"
"log"
"os"
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/gorilla/websocket"
)
var debug = false
func unexpected(request string) error {
return fmt.Errorf("Unexpected response received to '%s' request", request)
}
func newRequest(method string) (map[string]interface{}, chan interface{}) {
req := make(map[string]interface{}, 8)
req["janus"] = method
return req, make(chan interface{})
}
// Gateway represents a connection to an instance of the Janus Gateway.
type Gateway struct {
// Sessions is a map of the currently active sessions to the gateway.
Sessions map[uint64]*Session
// Access to the Sessions map should be synchronized with the Gateway.Lock()
// and Gateway.Unlock() methods provided by the embeded sync.Mutex.
sync.Mutex
conn *websocket.Conn
nextTransaction uint64
transactions map[uint64]chan interface{}
transactionsUsed map[uint64]bool
errors chan error
sendChan chan []byte
writeMu sync.Mutex
}
// Connect initiates a webscoket connection with the Janus Gateway
func Connect(wsURL string) (*Gateway, error) {
websocket.DefaultDialer.Subprotocols = []string{"janus-protocol"}
conn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
if err != nil {
return nil, err
}
gateway := new(Gateway)
gateway.conn = conn
gateway.transactions = make(map[uint64]chan interface{})
gateway.transactionsUsed = make(map[uint64]bool)
gateway.Sessions = make(map[uint64]*Session)
gateway.sendChan = make(chan []byte, 100)
gateway.errors = make(chan error)
go gateway.ping()
go gateway.recv()
return gateway, nil
}
// Close closes the underlying connection to the Gateway.
func (gateway *Gateway) Close() error {
return gateway.conn.Close()
}
// GetErrChan returns a channels through which the caller can check and react to connectivity errors
func (gateway *Gateway) GetErrChan() chan error {
return gateway.errors
}
func (gateway *Gateway) send(msg map[string]interface{}, transaction chan interface{}) {
id := atomic.AddUint64(&gateway.nextTransaction, 1)
msg["transaction"] = strconv.FormatUint(id, 10)
gateway.Lock()
gateway.transactions[id] = transaction
gateway.transactionsUsed[id] = false
gateway.Unlock()
data, err := json.Marshal(msg)
if err != nil {
fmt.Printf("json.Marshal: %s\n", err)
return
}
if debug {
// log message being sent
var log bytes.Buffer
json.Indent(&log, data, ">", " ")
log.Write([]byte("\n"))
log.WriteTo(os.Stdout)
}
gateway.writeMu.Lock()
err = gateway.conn.WriteMessage(websocket.TextMessage, data)
gateway.writeMu.Unlock()
if err != nil {
select {
case gateway.errors <- err:
default:
fmt.Printf("conn.Write: %s\n", err)
}
return
}
}
func passMsg(ch chan interface{}, msg interface{}) {
ch <- msg
}
func (gateway *Gateway) ping() {
ticker := time.NewTicker(time.Second * 30)
defer ticker.Stop()
for {
select {
case <-ticker.C:
err := gateway.conn.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(20*time.Second))
if err != nil {
select {
case gateway.errors <- err:
default:
log.Println("ping:", err)
}
return
}
}
}
}
func (gateway *Gateway) sendloop() {
}
func (gateway *Gateway) recv() {
for {
// Read message from Gateway
// Decode to Msg struct
var base BaseMsg
_, data, err := gateway.conn.ReadMessage()
if err != nil {
select {
case gateway.errors <- err:
default:
fmt.Printf("conn.Read: %s\n", err)
}
return
}
if err := json.Unmarshal(data, &base); err != nil {
fmt.Printf("json.Unmarshal: %s\n", err)
continue
}
if debug {
// log message being sent
var log bytes.Buffer
json.Indent(&log, data, "<", " ")
log.Write([]byte("\n"))
log.WriteTo(os.Stdout)
}
typeFunc, ok := msgtypes[base.Type]
if !ok {
fmt.Printf("Unknown message type received!\n")
continue
}
msg := typeFunc()
if err := json.Unmarshal(data, &msg); err != nil {
fmt.Printf("json.Unmarshal: %s\n", err)
continue // Decode error
}
var transactionUsed bool
if base.ID != "" {
id, _ := strconv.ParseUint(base.ID, 10, 64)
gateway.Lock()
transactionUsed = gateway.transactionsUsed[id]
gateway.Unlock()
}
// Pass message on from here
if base.ID == "" || transactionUsed {
// Is this a Handle event?
if base.Handle == 0 {
// Error()
} else {
// Lookup Session
gateway.Lock()
session := gateway.Sessions[base.Session]
gateway.Unlock()
if session == nil {
fmt.Printf("Unable to deliver message. Session gone?\n")
continue
}
// Lookup Handle
session.Lock()
handle := session.Handles[base.Handle]
session.Unlock()
if handle == nil {
fmt.Printf("Unable to deliver message. Handle gone?\n")
continue
}
// Pass msg
go passMsg(handle.Events, msg)
}
} else {
id, _ := strconv.ParseUint(base.ID, 10, 64)
// Lookup Transaction
gateway.Lock()
transaction := gateway.transactions[id]
switch msg.(type) {
case *EventMsg:
gateway.transactionsUsed[id] = true
}
gateway.Unlock()
if transaction == nil {
// Error()
}
// Pass msg
go passMsg(transaction, msg)
}
}
}
// Info sends an info request to the Gateway.
// On success, an InfoMsg will be returned and error will be nil.
func (gateway *Gateway) Info() (*InfoMsg, error) {
req, ch := newRequest("info")
gateway.send(req, ch)
msg := <-ch
switch msg := msg.(type) {
case *InfoMsg:
return msg, nil
case *ErrorMsg:
return nil, msg
}
return nil, unexpected("info")
}
// Create sends a create request to the Gateway.
// On success, a new Session will be returned and error will be nil.
func (gateway *Gateway) Create() (*Session, error) {
req, ch := newRequest("create")
gateway.send(req, ch)
msg := <-ch
var success *SuccessMsg
switch msg := msg.(type) {
case *SuccessMsg:
success = msg
case *ErrorMsg:
return nil, msg
}
// Create new session
session := new(Session)
session.gateway = gateway
session.ID = success.Data.ID
session.Handles = make(map[uint64]*Handle)
session.Events = make(chan interface{}, 2)
// Store this session
gateway.Lock()
gateway.Sessions[session.ID] = session
gateway.Unlock()
return session, nil
}
// Session represents a session instance on the Janus Gateway.
type Session struct {
// ID is the session_id of this session
ID uint64
// Handles is a map of plugin handles within this session
Handles map[uint64]*Handle
Events chan interface{}
// Access to the Handles map should be synchronized with the Session.Lock()
// and Session.Unlock() methods provided by the embeded sync.Mutex.
sync.Mutex
gateway *Gateway
}
func (session *Session) send(msg map[string]interface{}, transaction chan interface{}) {
msg["session_id"] = session.ID
session.gateway.send(msg, transaction)
}
// Attach sends an attach request to the Gateway within this session.
// plugin should be the unique string of the plugin to attach to.
// On success, a new Handle will be returned and error will be nil.
func (session *Session) Attach(plugin string) (*Handle, error) {
req, ch := newRequest("attach")
req["plugin"] = plugin
session.send(req, ch)
var success *SuccessMsg
msg := <-ch
switch msg := msg.(type) {
case *SuccessMsg:
success = msg
case *ErrorMsg:
return nil, msg
}
handle := new(Handle)
handle.session = session
handle.ID = success.Data.ID
handle.Events = make(chan interface{}, 8)
session.Lock()
session.Handles[handle.ID] = handle
session.Unlock()
return handle, nil
}
// KeepAlive sends a keep-alive request to the Gateway.
// On success, an AckMsg will be returned and error will be nil.
func (session *Session) KeepAlive() (*AckMsg, error) {
req, ch := newRequest("keepalive")
session.send(req, ch)
msg := <-ch
switch msg := msg.(type) {
case *AckMsg:
return msg, nil
case *ErrorMsg:
return nil, msg
}
return nil, unexpected("keepalive")
}
// Destroy sends a destroy request to the Gateway to tear down this session.
// On success, the Session will be removed from the Gateway.Sessions map, an
// AckMsg will be returned and error will be nil.
func (session *Session) Destroy() (*AckMsg, error) {
req, ch := newRequest("destroy")
session.send(req, ch)
var ack *AckMsg
msg := <-ch
switch msg := msg.(type) {
case *AckMsg:
ack = msg
case *ErrorMsg:
return nil, msg
}
// Remove this session from the gateway
session.gateway.Lock()
delete(session.gateway.Sessions, session.ID)
session.gateway.Unlock()
return ack, nil
}
// Handle represents a handle to a plugin instance on the Gateway.
type Handle struct {
// ID is the handle_id of this plugin handle
ID uint64
// Type // pub or sub
Type string
//User // Userid
User string
// Events is a receive only channel that can be used to receive events
// related to this handle from the gateway.
Events chan interface{}
session *Session
}
func (handle *Handle) send(msg map[string]interface{}, transaction chan interface{}) {
msg["handle_id"] = handle.ID
handle.session.send(msg, transaction)
}
// Request sends a sync request
func (handle *Handle) Request(body interface{}) (*SuccessMsg, error) {
req, ch := newRequest("message")
if body != nil {
req["body"] = body
}
handle.send(req, ch)
msg := <-ch
switch msg := msg.(type) {
case *SuccessMsg:
return msg, nil
case *ErrorMsg:
return nil, msg
}
return nil, unexpected("message")
}
// Message sends a message request to a plugin handle on the Gateway.
// body should be the plugin data to be passed to the plugin, and jsep should
// contain an optional SDP offer/answer to establish a WebRTC PeerConnection.
// On success, an EventMsg will be returned and error will be nil.
func (handle *Handle) Message(body, jsep interface{}) (*EventMsg, error) {
req, ch := newRequest("message")
if body != nil {
req["body"] = body
}
if jsep != nil {
req["jsep"] = jsep
}
handle.send(req, ch)
GetMessage: // No tears..
msg := <-ch
switch msg := msg.(type) {
case *AckMsg:
goto GetMessage // ..only dreams.
case *EventMsg:
return msg, nil
case *ErrorMsg:
return nil, msg
}
return nil, unexpected("message")
}
// Trickle sends a trickle request to the Gateway as part of establishing
// a new PeerConnection with a plugin.
// candidate should be a single ICE candidate, or a completed object to
// signify that all candidates have been sent:
// {
// "completed": true
// }
// On success, an AckMsg will be returned and error will be nil.
func (handle *Handle) Trickle(candidate interface{}) (*AckMsg, error) {
req, ch := newRequest("trickle")
req["candidate"] = candidate
handle.send(req, ch)
msg := <-ch
switch msg := msg.(type) {
case *AckMsg:
return msg, nil
case *ErrorMsg:
return nil, msg
}
return nil, unexpected("trickle")
}
// TrickleMany sends a trickle request to the Gateway as part of establishing
// a new PeerConnection with a plugin.
// candidates should be an array of ICE candidates.
// On success, an AckMsg will be returned and error will be nil.
func (handle *Handle) TrickleMany(candidates interface{}) (*AckMsg, error) {
req, ch := newRequest("trickle")
req["candidates"] = candidates
handle.send(req, ch)
msg := <-ch
switch msg := msg.(type) {
case *AckMsg:
return msg, nil
case *ErrorMsg:
return nil, msg
}
return nil, unexpected("trickle")
}
// Detach sends a detach request to the Gateway to remove this handle.
// On success, an AckMsg will be returned and error will be nil.
func (handle *Handle) Detach() (*AckMsg, error) {
req, ch := newRequest("detach")
handle.send(req, ch)
var ack *AckMsg
msg := <-ch
switch msg := msg.(type) {
case *AckMsg:
ack = msg
case *ErrorMsg:
return nil, msg
}
// Remove this handle from the session
handle.session.Lock()
delete(handle.session.Handles, handle.ID)
handle.session.Unlock()
return ack, nil
}