# Copyright (C) 2005 Robey Pointer <robey@lag.net>, Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import os
import socket
import threading
import time

import bzrlib.bzrdir as bzrdir
import bzrlib.errors as errors
from bzrlib.osutils import pathjoin, lexists, set_or_unset_env
from bzrlib.tests import TestCaseWithTransport, TestCase, TestSkipped
import bzrlib.transport
from bzrlib.transport import get_transport
import bzrlib.transport.http
from bzrlib.workingtree import WorkingTree

try:
    import paramiko
    paramiko_loaded = True
except ImportError:
    paramiko_loaded = False


def set_test_transport_to_sftp(testcase):
    """A helper to set transports on test case instances."""
    from bzrlib.transport.sftp import SFTPAbsoluteServer, SFTPHomeDirServer
    if getattr(testcase, '_get_remote_is_absolute', None) is None:
        testcase._get_remote_is_absolute = True
    if testcase._get_remote_is_absolute:
        testcase.transport_server = SFTPAbsoluteServer
    else:
        testcase.transport_server = SFTPHomeDirServer
    testcase.transport_readonly_server = bzrlib.transport.http.HttpServer


class TestCaseWithSFTPServer(TestCaseWithTransport):
    """A test case base class that provides a sftp server on localhost."""

    def setUp(self):
        super(TestCaseWithSFTPServer, self).setUp()
        if not paramiko_loaded:
            raise TestSkipped('you must have paramiko to run this test')
        set_test_transport_to_sftp(self) 

    def get_transport(self, path=None):
        """Return a transport relative to self._test_root."""
        return bzrlib.transport.get_transport(self.get_url(path))


class SFTPLockTests (TestCaseWithSFTPServer):

    def test_sftp_locks(self):
        from bzrlib.errors import LockError
        t = self.get_transport()

        l = t.lock_write('bogus')
        self.failUnlessExists('bogus.write-lock')

        # Don't wait for the lock, locking an already locked
        # file should raise an assert
        self.assertRaises(LockError, t.lock_write, 'bogus')

        l.unlock()
        self.failIf(lexists('bogus.write-lock'))

        open('something.write-lock', 'wb').write('fake lock\n')
        self.assertRaises(LockError, t.lock_write, 'something')
        os.remove('something.write-lock')

        l = t.lock_write('something')

        l2 = t.lock_write('bogus')

        l.unlock()
        l2.unlock()

    def test_multiple_connections(self):
        t = self.get_transport()
        self.assertTrue('sftpserver - new connection' in self.get_server().logs)
        self.get_server().logs = []
        # The second request should reuse the first connection
        # SingleListener only allows for a single connection,
        # So the next line fails unless the connection is reused
        t2 = self.get_transport()
        self.assertEquals(self.get_server().logs, [])


class SFTPTransportTestRelative(TestCaseWithSFTPServer):
    """Test the SFTP transport with homedir based relative paths."""

    def test__remote_path(self):
        t = self.get_transport()
        # try what is currently used:
        # remote path = self._abspath(relpath)
        self.assertEqual(self.test_dir + '/relative', t._remote_path('relative'))
        # we dont os.path.join because windows gives us the wrong path
        root_segments = self.test_dir.split('/')
        root_parent = '/'.join(root_segments[:-1])
        # .. should be honoured
        self.assertEqual(root_parent + '/sibling', t._remote_path('../sibling'))
        # /  should be illegal ?
        ### FIXME decide and then test for all transports. RBC20051208


class SFTPTransportTestRelativeRoot(TestCaseWithSFTPServer):
    """Test the SFTP transport with homedir based relative paths."""

    def setUp(self):
        self._get_remote_is_absolute = False
        super(SFTPTransportTestRelativeRoot, self).setUp()

    def test__remote_path_relative_root(self):
        # relative paths are preserved
        t = self.get_transport('')
        # the remote path should be ''
        self.assertEqual('', t._path)
        self.assertEqual('a', t._remote_path('a'))


class FakeSFTPTransport (object):
    _sftp = object()
fake = FakeSFTPTransport()


class SFTPNonServerTest(TestCase):
    def setUp(self):
        TestCase.setUp(self)
        if not paramiko_loaded:
            raise TestSkipped('you must have paramiko to run this test')

    def test_parse_url(self):
        from bzrlib.transport.sftp import SFTPTransport
        s = SFTPTransport('sftp://simple.example.com/home/source', clone_from=fake)
        self.assertEquals(s._host, 'simple.example.com')
        self.assertEquals(s._port, None)
        self.assertEquals(s._path, '/home/source')
        self.failUnless(s._password is None)

        self.assertEquals(s.base, 'sftp://simple.example.com/home/source/')

        s = SFTPTransport('sftp://ro%62ey:h%40t@example.com:2222/~/relative', clone_from=fake)
        self.assertEquals(s._host, 'example.com')
        self.assertEquals(s._port, 2222)
        self.assertEquals(s._username, 'robey')
        self.assertEquals(s._password, 'h@t')
        self.assertEquals(s._path, 'relative')

        # Base should not keep track of the password
        self.assertEquals(s.base, 'sftp://robey@example.com:2222/~/relative/')

    def test_relpath(self):
        from bzrlib.transport.sftp import SFTPTransport
        from bzrlib.errors import PathNotChild

        s = SFTPTransport('sftp://user@host.com/abs/path', clone_from=fake)
        self.assertEquals(s.relpath('sftp://user@host.com/abs/path/sub'), 'sub')
        # Can't test this one, because we actually get an AssertionError
        # TODO: Consider raising an exception rather than an assert
        #self.assertRaises(PathNotChild, s.relpath, 'http://user@host.com/abs/path/sub')
        self.assertRaises(PathNotChild, s.relpath, 'sftp://user2@host.com/abs/path/sub')
        self.assertRaises(PathNotChild, s.relpath, 'sftp://user@otherhost.com/abs/path/sub')
        self.assertRaises(PathNotChild, s.relpath, 'sftp://user@host.com:33/abs/path/sub')
        self.assertRaises(PathNotChild, s.relpath, 'sftp://user@host.com/~/rel/path/sub')

        # Make sure it works when we don't supply a username
        s = SFTPTransport('sftp://host.com/abs/path', clone_from=fake)
        self.assertEquals(s.relpath('sftp://host.com/abs/path/sub'), 'sub')

        # Make sure it works when parts of the path will be url encoded
        # TODO: These may be incorrect, we might need to urllib.urlencode() before
        # we pass the paths into the SFTPTransport constructor
        s = SFTPTransport('sftp://host.com/dev/,path', clone_from=fake)
        self.assertEquals(s.relpath('sftp://host.com/dev/,path/sub'), 'sub')
        s = SFTPTransport('sftp://host.com/dev/%path', clone_from=fake)
        self.assertEquals(s.relpath('sftp://host.com/dev/%path/sub'), 'sub')

    def test_parse_invalid_url(self):
        from bzrlib.transport.sftp import SFTPTransport, TransportError
        try:
            s = SFTPTransport('sftp://lilypond.org:~janneke/public_html/bzr/gub',
                              clone_from=fake)
            self.fail('expected exception not raised')
        except TransportError, e:
            self.assertEquals(str(e),
                    'Transport error: '
                    'invalid port number ~janneke in url:\n'
                    'sftp://lilypond.org:~janneke/public_html/bzr/gub ')

    def test_get_paramiko_vendor(self):
        """Test that if no 'ssh' is available we get builtin paramiko"""
        from bzrlib.transport import ssh
        # set '.' as the only location in the path, forcing no 'ssh' to exist
        orig_vendor = ssh._ssh_vendor
        orig_path = set_or_unset_env('PATH', '.')
        try:
            # No vendor defined yet, query for one
            ssh._ssh_vendor = None
            vendor = ssh._get_ssh_vendor()
            self.assertIsInstance(vendor, ssh.ParamikoVendor)
        finally:
            set_or_unset_env('PATH', orig_path)
            ssh._ssh_vendor = orig_vendor

    def test_abspath_root_sibling_server(self):
        from bzrlib.transport.sftp import SFTPSiblingAbsoluteServer
        server = SFTPSiblingAbsoluteServer()
        server.setUp()
        try:
            transport = get_transport(server.get_url())
            self.assertFalse(transport.abspath('/').endswith('/~/'))
            self.assertTrue(transport.abspath('/').endswith('/'))
            del transport
        finally:
            server.tearDown()


class SFTPBranchTest(TestCaseWithSFTPServer):
    """Test some stuff when accessing a bzr Branch over sftp"""

    def test_lock_file(self):
        # old format branches use a special lock file on sftp.
        b = self.make_branch('', format=bzrdir.BzrDirFormat6())
        b = bzrlib.branch.Branch.open(self.get_url())
        self.failUnlessExists('.bzr/')
        self.failUnlessExists('.bzr/branch-format')
        self.failUnlessExists('.bzr/branch-lock')

        self.failIf(lexists('.bzr/branch-lock.write-lock'))
        b.lock_write()
        self.failUnlessExists('.bzr/branch-lock.write-lock')
        b.unlock()
        self.failIf(lexists('.bzr/branch-lock.write-lock'))

    def test_push_support(self):
        self.build_tree(['a/', 'a/foo'])
        t = bzrdir.BzrDir.create_standalone_workingtree('a')
        b = t.branch
        t.add('foo')
        t.commit('foo', rev_id='a1')

        b2 = bzrdir.BzrDir.create_branch_and_repo(self.get_url('/b'))
        b2.pull(b)

        self.assertEquals(b2.revision_history(), ['a1'])

        open('a/foo', 'wt').write('something new in foo\n')
        t.commit('new', rev_id='a2')
        b2.pull(b)

        self.assertEquals(b2.revision_history(), ['a1', 'a2'])


class SSHVendorConnection(TestCaseWithSFTPServer):
    """Test that the ssh vendors can all connect.

    Verify that a full-handshake (SSH over loopback TCP) sftp connection works.

    We have 3 sftp implementations in the test suite:
      'loopback': Doesn't use ssh, just uses a local socket. Most tests are
                  done this way to save the handshaking time, so it is not
                  tested again here
      'none':     This uses paramiko's built-in ssh client and server, and layers
                  sftp on top of it.
      None:       If 'ssh' exists on the machine, then it will be spawned as a
                  child process.
    """
    
    def setUp(self):
        super(SSHVendorConnection, self).setUp()
        from bzrlib.transport.sftp import SFTPFullAbsoluteServer

        def create_server():
            """Just a wrapper so that when created, it will set _vendor"""
            # SFTPFullAbsoluteServer can handle any vendor,
            # it just needs to be set between the time it is instantiated
            # and the time .setUp() is called
            server = SFTPFullAbsoluteServer()
            server._vendor = self._test_vendor
            return server
        self._test_vendor = 'loopback'
        self.transport_server = create_server
        f = open('a_file', 'wb')
        try:
            f.write('foobar\n')
        finally:
            f.close()

    def set_vendor(self, vendor):
        self._test_vendor = vendor

    def test_connection_paramiko(self):
        from bzrlib.transport import ssh
        self.set_vendor(ssh.ParamikoVendor())
        t = self.get_transport()
        self.assertEqual('foobar\n', t.get('a_file').read())

    def test_connection_vendor(self):
        raise TestSkipped("We don't test spawning real ssh,"
                          " because it prompts for a password."
                          " Enable this test if we figure out"
                          " how to prevent this.")
        self.set_vendor(None)
        t = self.get_transport()
        self.assertEqual('foobar\n', t.get('a_file').read())


class SSHVendorBadConnection(TestCaseWithTransport):
    """Test that the ssh vendors handle bad connection properly

    We don't subclass TestCaseWithSFTPServer, because we don't actually
    need an SFTP connection.
    """

    def setUp(self):
        if not paramiko_loaded:
            raise TestSkipped('you must have paramiko to run this test')
        super(SSHVendorBadConnection, self).setUp()
        import bzrlib.transport.ssh

        # open a random port, so we know nobody else is using it
        # but don't actually listen on the port.
        s = socket.socket()
        s.bind(('localhost', 0))
        self.bogus_url = 'sftp://%s:%s/' % s.getsockname()

        orig_vendor = bzrlib.transport.ssh._ssh_vendor
        def reset():
            bzrlib.transport.ssh._ssh_vendor = orig_vendor
            s.close()
        self.addCleanup(reset)

    def set_vendor(self, vendor):
        import bzrlib.transport.ssh
        bzrlib.transport.ssh._ssh_vendor = vendor

    def test_bad_connection_paramiko(self):
        """Test that a real connection attempt raises the right error"""
        from bzrlib.transport import ssh
        self.set_vendor(ssh.ParamikoVendor())
        self.assertRaises(errors.ConnectionError,
                          bzrlib.transport.get_transport, self.bogus_url)

    def test_bad_connection_ssh(self):
        """None => auto-detect vendor"""
        self.set_vendor(None)
        # This is how I would normally test the connection code
        # it makes it very clear what we are testing.
        # However, 'ssh' will create stipple on the output, so instead
        # I'm using run_bzr_subprocess, and parsing the output
        # try:
        #     t = bzrlib.transport.get_transport(self.bogus_url)
        # except errors.ConnectionError:
        #     # Correct error
        #     pass
        # except errors.NameError, e:
        #     if 'SSHException' in str(e):
        #         raise TestSkipped('Known NameError bug in paramiko 1.6.1')
        #     raise
        # else:
        #     self.fail('Excepted ConnectionError to be raised')

        out, err = self.run_bzr_subprocess('log', self.bogus_url, retcode=3)
        self.assertEqual('', out)
        if "NameError: global name 'SSHException'" in err:
            # We aren't fixing this bug, because it is a bug in
            # paramiko, but we know about it, so we don't have to
            # fail the test
            raise TestSkipped('Known NameError bug with paramiko-1.6.1')
        self.assertContainsRe(err, 'Connection error')


class SFTPLatencyKnob(TestCaseWithSFTPServer):
    """Test that the testing SFTPServer's latency knob works."""

    def test_latency_knob_slows_transport(self):
        # change the latency knob to 500ms. We take about 40ms for a 
        # loopback connection ordinarily.
        start_time = time.time()
        self.get_server().add_latency = 0.5
        transport = self.get_transport()
        with_latency_knob_time = time.time() - start_time
        self.assertTrue(with_latency_knob_time > 0.4)

    def test_default(self):
        # This test is potentially brittle: under extremely high machine load
        # it could fail, but that is quite unlikely
        start_time = time.time()
        transport = self.get_transport()
        regular_time = time.time() - start_time
        self.assertTrue(regular_time < 0.5)


class FakeSocket(object):
    """Fake socket object used to test the SocketDelay wrapper without
    using a real socket.
    """

    def __init__(self):
        self._data = ""

    def send(self, data, flags=0):
        self._data += data
        return len(data)

    def sendall(self, data, flags=0):
        self._data += data
        return len(data)

    def recv(self, size, flags=0):
        if size < len(self._data):
            result = self._data[:size]
            self._data = self._data[size:]
            return result
        else:
            result = self._data
            self._data = ""
            return result


class TestSocketDelay(TestCase):

    def setUp(self):
        TestCase.setUp(self)
        if not paramiko_loaded:
            raise TestSkipped('you must have paramiko to run this test')

    def test_delay(self):
        from bzrlib.transport.sftp import SocketDelay
        sending = FakeSocket()
        receiving = SocketDelay(sending, 0.1, bandwidth=1000000,
                                really_sleep=False)
        # check that simulated time is charged only per round-trip:
        t1 = SocketDelay.simulated_time
        receiving.send("connect1")
        self.assertEqual(sending.recv(1024), "connect1")
        t2 = SocketDelay.simulated_time
        self.assertAlmostEqual(t2 - t1, 0.1)
        receiving.send("connect2")
        self.assertEqual(sending.recv(1024), "connect2")
        sending.send("hello")
        self.assertEqual(receiving.recv(1024), "hello")
        t3 = SocketDelay.simulated_time
        self.assertAlmostEqual(t3 - t2, 0.1)
        sending.send("hello")
        self.assertEqual(receiving.recv(1024), "hello")
        sending.send("hello")
        self.assertEqual(receiving.recv(1024), "hello")
        sending.send("hello")
        self.assertEqual(receiving.recv(1024), "hello")
        t4 = SocketDelay.simulated_time
        self.assertAlmostEqual(t4, t3)

    def test_bandwidth(self):
        from bzrlib.transport.sftp import SocketDelay
        sending = FakeSocket()
        receiving = SocketDelay(sending, 0, bandwidth=8.0/(1024*1024),
                                really_sleep=False)
        # check that simulated time is charged only per round-trip:
        t1 = SocketDelay.simulated_time
        receiving.send("connect")
        self.assertEqual(sending.recv(1024), "connect")
        sending.send("a" * 100)
        self.assertEqual(receiving.recv(1024), "a" * 100)
        t2 = SocketDelay.simulated_time
        self.assertAlmostEqual(t2 - t1, 100 + 7)


