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require "em-websocket"
require "em-hiredis"
require "json"
EM.run do
@channels = Hash.new
@redis = EM::Hiredis.connect("unix://#{File.expand_path('..')}/redis/redis.socket")
pubsub = @redis.pubsub
pubsub.subscribe "todos"
pubsub.on(:message) do |redis_channel, message|
message = JSON.parse(message)
data = {
channel: redis_channel,
data: message
}
if redis_channel == "todos"
channel = @channels[message["user_id"].to_s]
channel[:channel].push data.to_json
end
end
EM::WebSocket.start(host: "0.0.0.0", port: "8080", debug: false) do |socket|
socket.onopen do |handshake|
channel = channel_for_socket(handshake)
sid = channel[:channel].subscribe do |msg|
socket.send msg
end
socket.onclose do
channel[:channel].unsubscribe(sid)
@channels.delete(path(handshake))
end
end
end
def path(handshake)
handshake.path.split("/").last
end
def channel_for_socket(handshake)
channel_path = path(handshake)
@channels[channel_path] ||= {
channel: EM::Channel.new,
user_id: channel_path,
subscribed: ['todos']
}
end
end
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