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chat_backend.rb
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chat_backend.rb
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require 'faye/websocket'
require 'thread'
require 'redis'
require 'json'
require 'erb'
module ChatDemo
class ChatBackend
KEEPALIVE_TIME = 15 # in seconds
CHANNEL = "chat-demo"
def initialize(app)
@app = app
@clients = []
uri = URI.parse(ENV["REDISCLOUD_URL"])
@redis = Redis.new(host: uri.host, port: uri.port, password: uri.password)
Thread.new do
redis_sub = Redis.new(host: uri.host, port: uri.port, password: uri.password)
redis_sub.subscribe(CHANNEL) do |on|
on.message do |channel, msg|
@clients.each {|ws| ws.send(msg) }
end
end
end
end
def call(env)
if Faye::WebSocket.websocket?(env)
ws = Faye::WebSocket.new(env, nil, {ping: KEEPALIVE_TIME })
ws.on :open do |event|
p [:open, ws.object_id]
@clients << ws
end
ws.on :message do |event|
p [:message, event.data]
@redis.publish(CHANNEL, sanitize(event.data))
end
ws.on :close do |event|
p [:close, ws.object_id, event.code, event.reason]
@clients.delete(ws)
ws = nil
end
# Return async Rack response
ws.rack_response
else
@app.call(env)
end
end
private
def sanitize(message)
json = JSON.parse(message)
json.each {|key, value| json[key] = ERB::Util.html_escape(value) }
JSON.generate(json)
end
end
end