r - Retrieving cached oauth token with packages httr, twitteR, and streamR -

the way i've found myself authenticated twitter api following:

library(twitter)  setup_twitter_oauth(consumer_key = "a",                  consumer_secret = "b",                  access_token = "c",                  access_secret = "d") 

after running this, can use functions in twitter fine. however, use streamr package, needs token oauth object:

filterstream("tweets.json", track = c("obama", "biden"), timeout = 20, oauth=my_oauth) 

from gather, setup_twitter_oauth function above wrapper around httr functions authorization token. token cached in working directory file called ".httr-oauth". question is: how load file r, such oauth object can use streamr?

use readrds()

 readrds('.httr-oauth') $xxxx0x000xxxx00000x0xx0x000000xx    request:   https://api.twitter.com/oauth/request_token  authorize: https://api.twitter.com/oauth/authenticate  access:    https://api.twitter.com/oauth/access_token  twitter   key:    xxxxxxxxxx0xxxxxxxxxxxxxx   secret:   oauth_token, oauth_token_secret, user_id, screen_name 

access environment in list through $long-alphanumeric-hash , within access $credentials , $oauth_token/$oauth_token_secret