# This file is part of Buildbot.  Buildbot 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, version 2.
#
# 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., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright Buildbot Team Members

from __future__ import absolute_import
from __future__ import print_function

import io
import os
import shutil
import sys
import tarfile

from twisted.internet import defer
from twisted.internet import reactor
from twisted.python import failure
from twisted.python import runtime
from twisted.trial import unittest

from buildbot_worker.commands import transfer
from buildbot_worker.test.fake.remote import FakeRemote
from buildbot_worker.test.util.command import CommandTestMixin


class FakeMasterMethods(object):
    # a fake to represent any of:
    # - FileWriter
    # - FileDirectoryWriter
    # - FileReader

    def __init__(self, add_update):
        self.add_update = add_update

        self.delay_write = False
        self.count_writes = False
        self.keep_data = False
        self.write_out_of_space_at = None

        self.delay_read = False
        self.count_reads = False

        self.unpack_fail = False

        self.written = False
        self.read = False
        self.data = b''

    def remote_write(self, data):
        if self.write_out_of_space_at is not None:
            self.write_out_of_space_at -= len(data)
            if self.write_out_of_space_at <= 0:
                f = failure.Failure(RuntimeError("out of space"))
                return defer.fail(f)
        if self.count_writes:
            self.add_update('write {0}'.format(len(data)))
        elif not self.written:
            self.add_update('write(s)')
            self.written = True

        if self.keep_data:
            self.data += data

        if self.delay_write:
            d = defer.Deferred()
            reactor.callLater(0.01, d.callback, None)
            return d
        return None

    def remote_read(self, length):
        if self.count_reads:
            self.add_update('read {0}'.format(length))
        elif not self.read:
            self.add_update('read(s)')
            self.read = True

        if not self.data:
            return ''

        _slice, self.data = self.data[:length], self.data[length:]
        if self.delay_read:
            d = defer.Deferred()
            reactor.callLater(0.01, d.callback, _slice)
            return d
        return _slice

    def remote_unpack(self):
        self.add_update('unpack')
        if self.unpack_fail:
            return defer.fail(failure.Failure(RuntimeError("out of space")))
        return None

    def remote_utime(self, accessed_modified):
        self.add_update('utime - {0}'.format(accessed_modified[0]))

    def remote_close(self):
        self.add_update('close')


class TestUploadFile(CommandTestMixin, unittest.TestCase):

    def setUp(self):
        self.setUpCommand()

        self.fakemaster = FakeMasterMethods(self.add_update)

        # write 180 bytes of data to upload
        self.datadir = os.path.join(self.basedir, 'workdir')
        if os.path.exists(self.datadir):
            shutil.rmtree(self.datadir)
        os.makedirs(self.datadir)

        self.datafile = os.path.join(self.datadir, 'data')
        # note: use of 'wb' here ensures newlines aren't translated on the
        # upload
        with open(self.datafile, mode="wb") as f:
            f.write(b"this is some data\n" * 10)

    def tearDown(self):
        self.tearDownCommand()

        if os.path.exists(self.datadir):
            shutil.rmtree(self.datadir)

    @defer.inlineCallbacks
    def test_simple(self):
        self.fakemaster.count_writes = True    # get actual byte counts

        self.make_command(transfer.WorkerFileUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=1000,
            blocksize=64,
            keepstamp=False,
        ))

        yield self.run_command()

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datafile)},
            'write 64', 'write 64', 'write 52', 'close',
            {'rc': 0}
        ])

    @defer.inlineCallbacks
    def test_truncated(self):
        self.fakemaster.count_writes = True    # get actual byte counts

        self.make_command(transfer.WorkerFileUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=100,
            blocksize=64,
            keepstamp=False,
        ))

        yield self.run_command()

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datafile)},
            'write 64', 'write 36', 'close',
            {'rc': 1,
             'stderr': "Maximum filesize reached, truncating file '{0}'".format(self.datafile)}
        ])

    @defer.inlineCallbacks
    def test_missing(self):
        self.make_command(transfer.WorkerFileUploadCommand, dict(
            workdir='workdir',
            workersrc='data-nosuch',
            writer=FakeRemote(self.fakemaster),
            maxsize=100,
            blocksize=64,
            keepstamp=False,
        ))

        yield self.run_command()

        df = self.datafile + "-nosuch"
        self.assertUpdates([
            {'header': 'sending {0}\n'.format(df)},
            'close',
            {'rc': 1,
             'stderr': "Cannot open file '{0}' for upload".format(df)}
        ])

    @defer.inlineCallbacks
    def test_out_of_space(self):
        self.fakemaster.write_out_of_space_at = 70
        self.fakemaster.count_writes = True    # get actual byte counts

        self.make_command(transfer.WorkerFileUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=1000,
            blocksize=64,
            keepstamp=False,
        ))

        yield self.assertFailure(self.run_command(), RuntimeError)

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datafile)},
            'write 64', 'close',
            {'rc': 1}
        ])

    @defer.inlineCallbacks
    def test_interrupted(self):
        self.fakemaster.delay_write = True  # write very slowly

        self.make_command(transfer.WorkerFileUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=100,
            blocksize=2,
            keepstamp=False,
        ))

        d = self.run_command()

        # wait a jiffy..
        interrupt_d = defer.Deferred()
        reactor.callLater(0.01, interrupt_d.callback, None)

        # and then interrupt the step
        def do_interrupt(_):
            return self.cmd.interrupt()
        interrupt_d.addCallback(do_interrupt)

        yield defer.DeferredList([d, interrupt_d])

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datafile)},
            'write(s)', 'close', {'rc': 1}
        ])

    @defer.inlineCallbacks
    def test_timestamp(self):
        self.fakemaster.count_writes = True    # get actual byte counts
        timestamp = (os.path.getatime(self.datafile),
                     os.path.getmtime(self.datafile))

        self.make_command(transfer.WorkerFileUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=1000,
            blocksize=64,
            keepstamp=True,
        ))

        yield self.run_command()

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datafile)},
            'write 64', 'write 64', 'write 52',
            'close', 'utime - {0}'.format(timestamp[0]),
            {'rc': 0}
        ])


class TestWorkerDirectoryUpload(CommandTestMixin, unittest.TestCase):

    def setUp(self):
        self.setUpCommand()

        self.fakemaster = FakeMasterMethods(self.add_update)

        # write a directory to upload
        self.datadir = os.path.join(self.basedir, 'workdir', 'data')
        if os.path.exists(self.datadir):
            shutil.rmtree(self.datadir)
        os.makedirs(self.datadir)
        with open(os.path.join(self.datadir, "aa"), mode="wb") as f:
            f.write(b"lots of a" * 100)
        with open(os.path.join(self.datadir, "bb"), mode="wb") as f:
            f.write(b"and a little b" * 17)

    def tearDown(self):
        self.tearDownCommand()

        if os.path.exists(self.datadir):
            shutil.rmtree(self.datadir)

    @defer.inlineCallbacks
    def test_simple(self, compress=None):
        self.fakemaster.keep_data = True

        self.make_command(transfer.WorkerDirectoryUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=None,
            blocksize=512,
            compress=compress,
        ))

        yield self.run_command()

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datadir)},
            'write(s)', 'unpack',  # note no 'close"
            {'rc': 0}
        ])

        f = io.BytesIO(self.fakemaster.data)
        a = tarfile.open(fileobj=f, name='check.tar', mode="r")
        exp_names = ['.', 'aa', 'bb']
        got_names = [n.rstrip('/') for n in a.getnames()]
        # py27 uses '' instead of '.'
        got_names = sorted([n or '.' for n in got_names])
        self.assertEqual(got_names, exp_names, "expected archive contents")
        a.close()
        f.close()

    # try it again with bz2 and gzip
    def test_simple_bz2(self):
        return self.test_simple('bz2')

    def test_simple_gz(self):
        return self.test_simple('gz')

    # except bz2 can't operate in stream mode on py24
    if sys.version_info[:2] <= (2, 4):
        test_simple_bz2.skip = "bz2 stream decompression not supported on Python-2.4"

    @defer.inlineCallbacks
    def test_out_of_space_unpack(self):
        self.fakemaster.keep_data = True
        self.fakemaster.unpack_fail = True

        self.make_command(transfer.WorkerDirectoryUploadCommand, dict(
            workdir='workdir',
            workersrc='data',
            writer=FakeRemote(self.fakemaster),
            maxsize=None,
            blocksize=512,
            compress=None
        ))

        yield self.assertFailure(self.run_command(), RuntimeError)

        self.assertUpdates([
            {'header': 'sending {0}\n'.format(self.datadir)},
            'write(s)', 'unpack',
            {'rc': 1}
        ])


class TestDownloadFile(CommandTestMixin, unittest.TestCase):

    def setUp(self):
        self.setUpCommand()

        self.fakemaster = FakeMasterMethods(self.add_update)

        # the command will write to the basedir, so make sure it exists
        if os.path.exists(self.basedir):
            shutil.rmtree(self.basedir)
        os.makedirs(self.basedir)

    def tearDown(self):
        self.tearDownCommand()

        if os.path.exists(self.basedir):
            shutil.rmtree(self.basedir)

    @defer.inlineCallbacks
    def test_simple(self):
        self.fakemaster.count_reads = True    # get actual byte counts
        self.fakemaster.data = test_data = b'1234' * 13
        assert(len(self.fakemaster.data) == 52)

        self.make_command(transfer.WorkerFileDownloadCommand, dict(
            workdir='.',
            workerdest='data',
            reader=FakeRemote(self.fakemaster),
            maxsize=None,
            blocksize=32,
            mode=0o777,
        ))

        yield self.run_command()

        self.assertUpdates([
            'read 32', 'read 32', 'read 32', 'close',
            {'rc': 0}
        ])
        datafile = os.path.join(self.basedir, 'data')
        self.assertTrue(os.path.exists(datafile))
        with open(datafile, mode="rb") as f:
            datafileContent = f.read()
        self.assertEqual(datafileContent, test_data)
        if runtime.platformType != 'win32':
            self.assertEqual(os.stat(datafile).st_mode & 0o777, 0o777)

    @defer.inlineCallbacks
    def test_mkdir(self):
        self.fakemaster.data = test_data = b'hi'

        self.make_command(transfer.WorkerFileDownloadCommand, dict(
            workdir='workdir',
            workerdest=os.path.join('subdir', 'data'),
            reader=FakeRemote(self.fakemaster),
            maxsize=None,
            blocksize=32,
            mode=0o777,
        ))

        yield self.run_command()

        self.assertUpdates([
            'read(s)', 'close',
            {'rc': 0}
        ])
        datafile = os.path.join(self.basedir, 'workdir', 'subdir', 'data')
        self.assertTrue(os.path.exists(datafile))
        with open(datafile, mode="rb") as f:
            datafileContent = f.read()
        self.assertEqual(datafileContent, test_data)

    @defer.inlineCallbacks
    def test_failure(self):
        self.fakemaster.data = 'hi'

        os.makedirs(os.path.join(self.basedir, 'dir'))
        self.make_command(transfer.WorkerFileDownloadCommand, dict(
            workdir='.',
            workerdest='dir',  # but that's a directory!
            reader=FakeRemote(self.fakemaster),
            maxsize=None,
            blocksize=32,
            mode=0o777,
        ))

        yield self.run_command()

        self.assertUpdates([
            'close',
            {'rc': 1,
             'stderr': "Cannot open file '{0}' for download".format(
             os.path.join(self.basedir, '.', 'dir'))}
        ])

    @defer.inlineCallbacks
    def test_truncated(self):
        self.fakemaster.data = test_data = b'tenchars--' * 10

        self.make_command(transfer.WorkerFileDownloadCommand, dict(
            workdir='.',
            workerdest='data',
            reader=FakeRemote(self.fakemaster),
            maxsize=50,
            blocksize=32,
            mode=0o777,
        ))

        yield self.run_command()

        self.assertUpdates([
            'read(s)', 'close',
            {'rc': 1,
             'stderr': "Maximum filesize reached, truncating file '{0}'".format(
             os.path.join(self.basedir, '.', 'data'))}
        ])
        datafile = os.path.join(self.basedir, 'data')
        self.assertTrue(os.path.exists(datafile))
        with open(datafile, mode="rb") as f:
            data = f.read()
        self.assertEqual(data, test_data[:50])

    @defer.inlineCallbacks
    def test_interrupted(self):
        self.fakemaster.data = b'tenchars--' * 100  # 1k
        self.fakemaster.delay_read = True  # read very slowly

        self.make_command(transfer.WorkerFileDownloadCommand, dict(
            workdir='.',
            workerdest='data',
            reader=FakeRemote(self.fakemaster),
            maxsize=100,
            blocksize=2,
            mode=0o777,
        ))

        d = self.run_command()

        # wait a jiffy..
        interrupt_d = defer.Deferred()
        reactor.callLater(0.01, interrupt_d.callback, None)

        # and then interrupt the step
        def do_interrupt(_):
            return self.cmd.interrupt()
        interrupt_d.addCallback(do_interrupt)

        yield defer.DeferredList([d, interrupt_d])

        self.assertUpdates([
            'read(s)', 'close', {'rc': 1}
        ])
