commit 77fbfe0e667886945df0755d19edfca11712f840 Author: Serene Han keroserene+git@gmail.com Date: Fri Jan 22 12:22:09 2016 -0800

Snowflake proxy successfully reset and bootstrap a new client (#15) --- broker/snowflake-broker.go | 2 ++ proxy/broker.coffee | 1 - proxy/proxypair.coffee | 18 +++++++++++++++--- proxy/snowflake.coffee | 37 ++++++++++++++++--------------------- 4 files changed, 33 insertions(+), 25 deletions(-)

diff --git a/broker/snowflake-broker.go b/broker/snowflake-broker.go index 13b0586..a6daa87 100644 --- a/broker/snowflake-broker.go +++ b/broker/snowflake-broker.go @@ -171,7 +171,9 @@ func proxyHandler(w http.ResponseWriter, r *http.Request) { w.Write(offer)

case <-time.After(time.Second * 10): + // This snowflake is no longer available to serve clients. heap.Remove(snowflakes, snowflake.index) + delete(snowflakeMap, snowflake.id) w.WriteHeader(http.StatusGatewayTimeout) } } diff --git a/proxy/broker.coffee b/proxy/broker.coffee index 91a81d2..34b5a88 100644 --- a/proxy/broker.coffee +++ b/proxy/broker.coffee @@ -69,7 +69,6 @@ class Broker return xhr.onreadystatechange = -> return if xhr.DONE != xhr.readyState - log xhr switch xhr.status when STATUS_OK log 'Broker: Successfully replied with answer.' diff --git a/proxy/proxypair.coffee b/proxy/proxypair.coffee index f78e9f6..cd87208 100644 --- a/proxy/proxypair.coffee +++ b/proxy/proxypair.coffee @@ -19,7 +19,8 @@ class ProxyPair

constructor: (@clientAddr, @relayAddr, @rateLimit) ->

- connectClient: => + # Prepare a WebRTC PeerConnection and await for an SDP offer. + begin: -> @pc = new PeerConnection config, { optional: [ { DtlsSrtpKeyAgreement: true } @@ -44,6 +45,16 @@ class ProxyPair @prepareDataChannel channel @client = channel

+ receiveWebRTCOffer: (offer) -> + console.assert 'offer' == offer.type + try + err = @pc.setRemoteDescription offer + catch e + log 'Invalid SDP message.' + return false + log 'SDP ' + offer.type + ' successfully received.' + true + prepareDataChannel: (channel) => channel.onopen = => log 'Data channel opened!' @@ -56,8 +67,9 @@ class ProxyPair log 'Data channel closed.' snowflake.state = MODE.INIT $msglog.className = '' - channel.onerror = -> - log 'Data channel error!' + # Change this for multiplexing. + snowflake.reset() + channel.onerror = -> log 'Data channel error!' channel.onmessage = @onClientToRelayMessage

# Assumes WebRTC datachannel is connected. diff --git a/proxy/snowflake.coffee b/proxy/snowflake.coffee index cc34f81..edf5e56 100644 --- a/proxy/snowflake.coffee +++ b/proxy/snowflake.coffee @@ -87,21 +87,17 @@ class Snowflake return false @relayAddr = addr log 'Using ' + relayAddr + ' as Relay.' - @beginWebRTC() - log 'Input offer from the snowflake client:' + log 'Input offer from the snowflake client:' if COPY_PASTE_ENABLED return true

# Initialize WebRTC PeerConnection beginWebRTC: -> - log 'Starting up Snowflake...\n' @state = MODE.WEBRTC_CONNECTING for i in [1..CONNECTIONS_PER_CLIENT] @makeProxyPair @relayAddr @proxyPair = @proxyPairs[0] - - # Poll broker for clients. - findClients: -> - poll = => + # Poll broker for clients. + findClients = => recv = broker.getClientOffer() recv.then((desc) => offer = JSON.parse desc @@ -109,21 +105,15 @@ class Snowflake @receiveOffer offer , (err) -> log err - setTimeout(poll, 1000) + setTimeout(findClients, 1000) ) - poll() + findClients()

- # Receive an SDP offer from client plugin. + # Receive an SDP offer from some client assigned by the Broker. receiveOffer: (desc) => sdp = new RTCSessionDescription desc - try - err = @proxyPair.pc.setRemoteDescription sdp - catch e - log 'Invalid SDP message.' - return false - log 'SDP ' + sdp.type + ' successfully received.' - @sendAnswer() if 'offer' == sdp.type - true + if @proxyPair.receiveWebRTCOffer sdp + @sendAnswer() if 'offer' == sdp.type

sendAnswer: => next = (sdp) => @@ -132,7 +122,6 @@ class Snowflake promise = @proxyPair.pc.createAnswer next promise.then next if promise

- makeProxyPair: (relay) -> pair = new ProxyPair null, relay, @rateLimit @proxyPairs.push pair @@ -141,7 +130,7 @@ class Snowflake @proxyPairs.splice(@proxyPairs.indexOf(pair), 1) @badge.endProxy() if @badge try - pair.connectClient() + pair.begin() catch err log 'ERROR: ProxyPair exception while connecting.' log err @@ -162,6 +151,12 @@ class Snowflake @cease() @badge.die() if @badge

+ # Close all existing ProxyPairs and begin finding new clients from scratch. + reset: -> + @cease() + log '\nSnowflake resetting...' + @beginWebRTC() + snowflake = null broker = null

@@ -241,6 +236,6 @@ init = -> log 'Input desired relay address:' else snowflake.setRelayAddr DEFAULT_WEBSOCKET - snowflake.findClients() + snowflake.beginWebRTC()

window.onload = init if window