通过Kotlin协程发出异步API请求阻止？

Question

顾名思义，我目前正在使用具有异步回调方法的API。我希望能够在继续其余代码之前等待结果（如果可行的话，使现有的异步调用有些同步）。协程可能吗？这就是我的代码现在的样子，但是该请求仍被多次调用（我是协程新手）。

class TokenAuthenticator @Inject constructor(val prefs: AppPrefs) : Authenticator {
    override fun authenticate(route: Route?, response: Response): Request? {
        if (response.code() == ApiErrorCode.UNAUTHORIZED) {
            Timber.w("Unauthorized. Refreshing token...")

            val token: String? = runBlocking(Dispatchers.Main) { refreshToken() }

            token?.let {
                return response
                        .request()
                        .newBuilder()
                        .header("Authorization", "Bearer $token")
                        .build()
            }
        }

        when (response.code()) {
            ApiErrorCode.UNAUTHORIZED -> Timber.w("Tried to refresh token. Failed?")
            else -> Timber.d("NOT refreshing token, response code was: ${response.code()}")
        }

        return response.request()
    }

    private suspend fun refreshToken() = suspendCoroutine<String?> {
        SomeApi.getValidAccessToken(object : TokenCallback {
            override fun onSuccess(accessToken: String?) {
                Timber.d("Token successfully retrieved. Storing to prefs...")
                prefs.userAuthToken = accessToken
                it.resume(accessToken)
            }

            override fun onError(errorData: Any?) {
                Timber.e("Error retrieving token")
                it.resume(null)
            }
        })
    }
}