# Copyright (c) 2006-2010 Mitch Garnaat http://garnaat.org/
# Copyright (c) 2010, Eucalyptus Systems, Inc.
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"""
Unit tests for subscribing SQS queues to SNS topics.
"""

import hashlib
import time

from tests.unit import unittest

from boto.compat import json
from boto.sqs.connection import SQSConnection
from boto.sns.connection import SNSConnection

class SNSSubcribeSQSTest(unittest.TestCase):

    sqs = True
    sns = True

    def setUp(self):
        self.sqsc = SQSConnection()
        self.snsc = SNSConnection()

    def get_policy_statements(self, queue):
        attrs = queue.get_attributes('Policy')
        policy = json.loads(attrs.get('Policy', "{}"))
        return policy.get('Statement', {})

    def test_correct_sid(self):
        now = time.time()
        topic_name = queue_name = "test_correct_sid%d" % (now)

        timeout = 60
        queue = self.sqsc.create_queue(queue_name, timeout)
        self.addCleanup(self.sqsc.delete_queue, queue, True)
        queue_arn = queue.arn

        topic = self.snsc.create_topic(topic_name)
        topic_arn = topic['CreateTopicResponse']['CreateTopicResult']\
                ['TopicArn']
        self.addCleanup(self.snsc.delete_topic, topic_arn)

        expected_sid = hashlib.md5(topic_arn + queue_arn).hexdigest()
        resp = self.snsc.subscribe_sqs_queue(topic_arn, queue)

        found_expected_sid = False
        statements = self.get_policy_statements(queue)
        for statement in statements:
            if statement['Sid'] == expected_sid:
                found_expected_sid = True
                break
        self.assertTrue(found_expected_sid)

    def test_idempotent_subscribe(self):
        now = time.time()
        topic_name = queue_name = "test_idempotent_subscribe%d" % (now)

        timeout = 60
        queue = self.sqsc.create_queue(queue_name, timeout)
        self.addCleanup(self.sqsc.delete_queue, queue, True)
        initial_statements = self.get_policy_statements(queue)
        queue_arn = queue.arn

        topic = self.snsc.create_topic(topic_name)
        topic_arn = topic['CreateTopicResponse']['CreateTopicResult']\
                ['TopicArn']
        self.addCleanup(self.snsc.delete_topic, topic_arn)

        resp = self.snsc.subscribe_sqs_queue(topic_arn, queue)
        time.sleep(3)
        first_subscribe_statements = self.get_policy_statements(queue)
        self.assertEqual(len(first_subscribe_statements),
                len(initial_statements) + 1)

        resp2 = self.snsc.subscribe_sqs_queue(topic_arn, queue)
        time.sleep(3)
        second_subscribe_statements = self.get_policy_statements(queue)
        self.assertEqual(len(second_subscribe_statements),
                len(first_subscribe_statements))
