commit ead579a6e9b426cb6182dea402343b26431e2eb3 Author: Cecylia Bocovich cohosh@torproject.org Date: Wed Jun 26 20:16:17 2019 -0400

Refactored poll loop

This enables breaking the loop from the outside and cleans up the countdown --- proxy/proxypair.coffee | 1 - proxy/snowflake.coffee | 54 ++++++++++++++++++++------------------------------ 2 files changed, 21 insertions(+), 34 deletions(-)

diff --git a/proxy/proxypair.coffee b/proxy/proxypair.coffee index f174a37..efcc8c7 100644 --- a/proxy/proxypair.coffee +++ b/proxy/proxypair.coffee @@ -60,7 +60,6 @@ class ProxyPair log 'Invalid SDP message.' return false dbg 'SDP ' + offer.type + ' successfully received.' - @active = true true

# Given a WebRTC DataChannel, prepare callbacks. diff --git a/proxy/snowflake.coffee b/proxy/snowflake.coffee index bb03cf0..b86e0b7 100644 --- a/proxy/snowflake.coffee +++ b/proxy/snowflake.coffee @@ -13,6 +13,7 @@ TODO: More documentation class Snowflake relayAddr: null rateLimit: null + pollInterval: null retries: 0

# Janky state machine @@ -54,43 +55,29 @@ class Snowflake @makeProxyPair @relayAddr log 'ProxyPair Slots: ' + @proxyPairs.length log 'Snowflake IDs: ' + (@proxyPairs.map (p) -> p.id).join ' | ' - @pollBroker() + @pollInterval = setInterval((=> @pollBroker()), config.defaultBrokerPollInterval) + log @pollInterval

# Regularly poll Broker for clients to serve until this snowflake is # serving at capacity, at which point stop polling. pollBroker: -> - # Temporary countdown. TODO: Simplify - countdown = (msg, sec, skip) => - if not skip then dbg msg - if sec > 0 - @ui.setStatus msg + ' (Polling in ' + sec + ' seconds...)' - sec-- - setTimeout((-> countdown(msg, sec, true)), 1000) - else - @ui.setStatus msg - findClients() # Poll broker for clients. - findClients = => - pair = @nextAvailableProxyPair() - if !pair - log 'At client capacity.' - # Do nothing until a new proxyPair is available. - return - msg = 'Polling for client ... ' - msg += '[retries: ' + @retries + ']' if @retries > 0 - @ui.setStatus msg - recv = @broker.getClientOffer pair.id - recv.then (desc) => - @receiveOffer pair, desc - countdown( - 'Serving 1 new client.', - @config.defaultBrokerPollInterval / 1000 - ) - , (err) => - countdown(err, @config.defaultBrokerPollInterval / 1000) - @retries++ - - findClients() + pair = @nextAvailableProxyPair() + if !pair + log 'At client capacity.' + # Do nothing until a new proxyPair is available. + return + pair.active = true + msg = 'Polling for client ... ' + msg += '[retries: ' + @retries + ']' if @retries > 0 + @ui.setStatus msg + recv = @broker.getClientOffer pair.id + recv.then (desc) => + @receiveOffer pair, desc + , (err) => + pair.active = false + @retries++ +

# Returns the first ProxyPair that's available to connect. nextAvailableProxyPair: -> @@ -99,7 +86,6 @@ class Snowflake # Receive an SDP offer from some client assigned by the Broker, # |pair| - an available ProxyPair. receiveOffer: (pair, desc) => - console.assert !pair.active try offer = JSON.parse desc dbg 'Received:\n\n' + offer.sdp + '\n' @@ -131,6 +117,8 @@ class Snowflake cease: -> while @proxyPairs.length > 0 @proxyPairs.pop().close() + log @pollInterval + clearInterval(@pollInterval)

disable: -> log 'Disabling Snowflake.'