## Tests for datacenter
##
## XXX: Most tests for datacenter are still in doctest datacenter.txt
##
import os
import shutil
import tempfile
import unittest
from zope.component import getUtility, getGlobalSiteManager
from zope.interface.verify import verifyObject, verifyClass
from waeup.kofa.datacenter import DataCenter
from waeup.kofa.interfaces import IDataCenter, IDataCenterConfig


class DataCenterTests(unittest.TestCase):

    def setUp(self):
        # create a temporary place to store files
        self.workdir = tempfile.mkdtemp()
        self.storage = os.path.join(self.workdir, 'storage')
        os.mkdir(self.storage)
        self.logpath = os.path.join(self.storage, 'logs', 'myapp.log')
        # register a datacenter config that provides the set up location
        self.config = {'path': self.storage,}
        self.gsm = getGlobalSiteManager()
        self.gsm.registerUtility(self.config, IDataCenterConfig)
        pass

    def tearDown(self):
        self.gsm.unregisterUtility(self.config, IDataCenterConfig)
        shutil.rmtree(self.workdir)
        return

    def fill_logfile(self, num=1):
        # write 100 messages into logfile, with 50 containing 'Msg'
        path = self.logpath
        for m in range(num):
            fp = open(path, 'wb')
            for n in range(50*m, 50*m+50):
                fp.write('Msg %d\n' % (n + 1))
                fp.write('Other Line %d\n' % (n + 1))
            fp.close()
            path = self.logpath + '.%d' % (m + 1)
        return

    def test_util_available(self):
        # a self-test
        config = getUtility(IDataCenterConfig)
        self.assertTrue(config is not None)
        return

    def test_iface(self):
        # we comply with interfaces
        obj = DataCenter()
        verifyClass(IDataCenter, DataCenter)
        verifyObject(IDataCenter, obj)
        return

    def test_query_logfiles(self):
        # We can find entries in logfiles
        datacenter = DataCenter()
        open(self.logpath, 'wb').write('Message 1\n')
        result = list(datacenter.queryLogfiles('myapp.log', 'Message'))
        self.assertEqual(result, ['Message 1\n'])
        return

    def test_query_logfiles_multi_logs(self):
        # We can find entries in multiple logfiles (backups)
        datacenter = DataCenter()
        open(self.logpath, 'wb').write('Msg 1\n')
        open(self.logpath + '.2', 'wb').write('Msg 2\n')
        open(self.logpath + '.10', 'wb').write('Msg 3\n')
        result = list(datacenter.queryLogfiles('myapp.log', 'Msg'))
        # entry of logfile .10 comes after entry of logfile .2
        self.assertEqual(result, ['Msg 1\n', 'Msg 2\n', 'Msg 3\n'])
        return

    def test_query_logfiles_ignores_other_logs(self):
        # We look only for the basename specified
        datacenter = DataCenter()
        open(self.logpath, 'wb').write('Msg 1\n')
        open(self.logpath + '-not-a-real-log', 'wb').write('Msg 2\n')
        result = list(datacenter.queryLogfiles('myapp.log', 'Msg'))
        # Msg 2 won't show up in results.
        self.assertEqual(result, ['Msg 1\n'])
        return

    def test_query_logfiles_not_existant(self):
        # We make sure only existing logs are searched
        datacenter = DataCenter()
        open(self.logpath + '.1', 'wb').write('Msg 1\n')
        result = list(datacenter.queryLogfiles('myapp.log', 'Msg'))
        # works, although there is no myapp.log, only myapp.log.1
        self.assertEqual(result, ['Msg 1\n'])
        return

    def test_query_logfiles_invalid_regexp(self):
        # Invalid regular expressions give a ValueError
        datacenter = DataCenter()
        open(self.logpath, 'wb').write('Msg 1\n')
        result = datacenter.queryLogfiles('myapp.log', '(a')
        self.assertRaises(ValueError, list, result)
        return

    def test_query_logfiles_batching_limit(self):
        # we can use `limit` for batching
        datacenter = DataCenter()
        self.fill_logfile()
        result = list(datacenter.queryLogfiles(
            'myapp.log', 'Msg', limit=10))
        self.assertEqual(len(result), 10)
        self.assertEqual(result[-1], 'Msg 10\n')
        return

    def test_query_logfiles_batching_start(self):
        # `start` is respected when batching
        datacenter = DataCenter()
        self.fill_logfile()
        result = list(datacenter.queryLogfiles(
            'myapp.log', 'Msg', start=25))
        self.assertEqual(len(result), 25)
        self.assertEqual(result[0], 'Msg 26\n')
        return

    def test_query_logfiles_batching_limit_and_start(self):
        # we can use `start` and `limit` simultanously
        datacenter = DataCenter()
        self.fill_logfile()
        result = list(datacenter.queryLogfiles(
            'myapp.log', 'Msg', start=25, limit=10))
        self.assertEqual(len(result), 10)
        self.assertEqual(result[0], 'Msg 26\n')
        self.assertEqual(result[-1], 'Msg 35\n')
        return

    def test_query_logfiles_batching_edge_cases(self):
        # we can find last matches if found num < limit.
        datacenter = DataCenter()
        self.fill_logfile()
        result = list(datacenter.queryLogfiles(
            'myapp.log', 'Msg', start=45, limit=10))
        self.assertEqual(len(result), 5)
        self.assertEqual(result[0], 'Msg 46\n')
        self.assertEqual(result[-1], 'Msg 50\n')
        return

    def test_query_logfiles_batching_multiple_files(self):
        # batching works also with multiple log files
        datacenter = DataCenter()
        self.fill_logfile(num=2)
        result = list(datacenter.queryLogfiles(
            'myapp.log', 'Msg', start=45, limit=10))
        self.assertEqual(len(result), 10)
        self.assertEqual(result[0], 'Msg 46\n')
        self.assertEqual(result[-1], 'Msg 55\n')
        return

    def test_query_logfiles_regex_match_inner(self):
        # we also find lines that match at some inner part
        datacenter = DataCenter()
        self.fill_logfile()
        result = list(datacenter.queryLogfiles('myapp.log', 'sg 1\n'))
        self.assertEqual(len(result), 1)
        self.assertEqual(result[0], 'Msg 1\n')
        return