Goliath内ではem-hiredisを非常にうまく使用しています。パブリッシングをコーディングした方法のサンプルを次に示します。
config / example_api.rb
# These give us direct access to the redis connection from within the API
config['redisUri'] = 'redis://localhost:6379/0'
config['redisPub'] ||= EM::Hiredis.connect('')
example_api.rb
class ExampleApi < Goliath::API
use Goliath::Rack::Params # parse & merge query and body parameters
use Goliath::Rack::Formatters::JSON # JSON output formatter
use Goliath::Rack::Render # auto-negotiate response format
def response(env)
env.logger.debug "\n\n\nENV: #{env['PATH_INFO']}"
env.logger.debug "REQUEST: Received"
env.logger.debug "POST Action received: #{env.params} "
#processing of requests from browser goes here
resp =
case env.params["action"]
when 'SOME_ACTION' then process_action(env)
when 'ANOTHER_ACTION' then process_another_action(env)
else
# skip
end
env.logger.debug "REQUEST: About to respond with: #{resp}"
[200, {'Content-Type' => 'application/json', 'Access-Control-Allow-Origin' => "*"}, resp]
end
# process an action
def process_action(env)
# extract message data
data = Hash.new
data["user_id"], data["object_id"] = env.params['user_id'], env.params['object_id']
publishData = { "action" => 'SOME_ACTION_RECEIVED',
"data" => data }
redisPub.publish("Channel_1", Yajl::Encoder.encode(publishData))
end
end
return data
end
# process anothr action
def process_another_action(env)
# extract message data
data = Hash.new
data["user_id"], data["widget_id"] = env.params['user_id'], env.params['widget_id']
publishData = { "action" => 'SOME_OTHER_ACTION_RECEIVED',
"data" => data }
redisPub.publish("Channel_1", Yajl::Encoder.encode(publishData))
end
end
return data
end
end
サブスクリプションの処理は、読者の演習として残されています。