sapling/tests/test-fb-hgext-remotefilelog-datapack.py

#!/usr/bin/env python
from __future__ import absolute_import, print_function

import hashlib
import os
import random
import shutil
import stat
import struct
import tempfile
import time
import unittest

import edenscm.mercurial.ui as uimod
import silenttestrunner
from hgext.extlib.pyrevisionstore import datapack as rustdatapack
from hgext.remotefilelog import constants
from hgext.remotefilelog.basepack import (
    LARGEFANOUTPREFIX,
    SMALLFANOUTCUTOFF,
    SMALLFANOUTPREFIX,
)
from hgext.remotefilelog.datapack import (
    datapack,
    datapackstore,
    fastdatapack,
    mutabledatapack,
)
from mercurial.node import nullid


try:
    xrange(0)
except NameError:
    xrange = range


class datapacktestsbase(object):
    def __init__(self, datapackreader, paramsavailable, iscdatapack):
        self.datapackreader = datapackreader
        self.iscdatapack = iscdatapack
        self.paramsavailable = paramsavailable

    def setUp(self):
        self.tempdirs = []

    def tearDown(self):
        for d in self.tempdirs:
            shutil.rmtree(d)

    def makeTempDir(self):
        tempdir = tempfile.mkdtemp()
        self.tempdirs.append(tempdir)
        return tempdir

    def getHash(self, content):
        return hashlib.sha1(content).digest()

    def getFakeHash(self):
        return "".join(chr(random.randint(0, 255)) for _ in range(20))

    def createPack(self, revisions=None, packdir=None, version=0):
        if revisions is None:
            revisions = [("filename", self.getFakeHash(), nullid, "content")]

        if packdir is None:
            packdir = self.makeTempDir()

        packer = mutabledatapack(uimod.ui(), packdir, version=version)

        for args in revisions:
            filename, node, base, content = args[0:4]
            # meta is optional
            meta = None
            if len(args) > 4:
                meta = args[4]
            packer.add(filename, node, base, content, metadata=meta)

        path = packer.close()
        return self.datapackreader(path)

    def _testAddSingle(self, content):
        """Test putting a simple blob into a pack and reading it out.
        """
        filename = "foo"
        node = self.getHash(content)

        revisions = [(filename, node, nullid, content)]
        pack = self.createPack(revisions)
        if self.paramsavailable:
            self.assertEquals(pack.params.fanoutprefix, SMALLFANOUTPREFIX)

        chain = pack.getdeltachain(filename, node)
        self.assertEquals(content, chain[0][4])

    def testAddSingle(self):
        self._testAddSingle("")

    def testAddSingleEmpty(self):
        self._testAddSingle("abcdef")

    def testAddMultiple(self):
        """Test putting multiple unrelated blobs into a pack and reading them
        out.
        """
        revisions = []
        for i in range(10):
            filename = "foo%s" % i
            content = "abcdef%s" % i
            node = self.getHash(content)
            revisions.append((filename, node, self.getFakeHash(), content))

        pack = self.createPack(revisions)

        for filename, node, base, content in revisions:
            entry = pack.getdelta(filename, node)
            self.assertEquals((content, filename, base, {}), entry)

            chain = pack.getdeltachain(filename, node)
            self.assertEquals(content, chain[0][4])

    def testAddDeltas(self):
        """Test putting multiple delta blobs into a pack and read the chain.
        """
        revisions = []
        filename = "foo"
        lastnode = nullid
        for i in range(10):
            content = "abcdef%s" % i
            node = self.getHash(content)
            revisions.append((filename, node, lastnode, content))
            lastnode = node

        pack = self.createPack(revisions)

        entry = pack.getdelta(filename, revisions[0][1])
        realvalue = (revisions[0][3], filename, revisions[0][2], {})
        self.assertEquals(entry, realvalue)

        # Test that the chain for the final entry has all the others
        chain = pack.getdeltachain(filename, node)
        for i in range(10):
            content = "abcdef%s" % i
            self.assertEquals(content, chain[-i - 1][4])

    def testPackMany(self):
        """Pack many related and unrelated objects.
        """
        # Build a random pack file
        revisions = []
        blobs = {}
        random.seed(0)
        for i in range(100):
            filename = "filename-%s" % i
            filerevs = []
            for j in range(random.randint(1, 100)):
                content = "content-%s-%s" % (i, j)
                node = self.getHash(content)
                lastnode = nullid
                if len(filerevs) > 0:
                    lastnode = filerevs[random.randint(0, len(filerevs) - 1)]
                filerevs.append(node)
                blobs[(filename, node, lastnode)] = content
                revisions.append((filename, node, lastnode, content))

        pack = self.createPack(revisions)

        # Verify the pack contents
        for (filename, node, lastnode), content in sorted(blobs.iteritems()):
            chain = pack.getdeltachain(filename, node)
            for entry in chain:
                expectedcontent = blobs[(entry[0], entry[1], entry[3])]
                self.assertEquals(entry[4], expectedcontent)

    def testPackMetadata(self):
        revisions = []
        for i in range(100):
            filename = "%s.txt" % i
            content = "put-something-here \n" * i
            node = self.getHash(content)
            meta = {constants.METAKEYFLAG: i ** 4, constants.METAKEYSIZE: len(content)}
            revisions.append((filename, node, nullid, content, meta))
        pack = self.createPack(revisions, version=1)
        for name, node, x, content, origmeta in revisions:
            parsedmeta = pack.getmeta(name, node)
            # flag == 0 should be optimized out
            if origmeta[constants.METAKEYFLAG] == 0:
                del origmeta[constants.METAKEYFLAG]
            self.assertEquals(parsedmeta, origmeta)

    def testPackMetadataThrows(self):
        filename = "1"
        content = "2"
        node = self.getHash(content)
        meta = {constants.METAKEYFLAG: 3}
        revisions = [(filename, node, nullid, content, meta)]
        try:
            self.createPack(revisions, version=0)
            self.assertTrue(False, "should throw if metadata is not supported")
        except RuntimeError:
            pass

    def testGetMissing(self):
        """Test the getmissing() api.
        """
        revisions = []
        filename = "foo"
        lastnode = nullid
        for i in range(10):
            content = "abcdef%s" % i
            node = self.getHash(content)
            revisions.append((filename, node, lastnode, content))
            lastnode = node

        pack = self.createPack(revisions)

        missing = pack.getmissing([("foo", revisions[0][1])])
        self.assertFalse(missing)

        missing = pack.getmissing([("foo", revisions[0][1]), ("foo", revisions[1][1])])
        self.assertFalse(missing)

        fakenode = self.getFakeHash()
        missing = pack.getmissing([("foo", revisions[0][1]), ("foo", fakenode)])
        self.assertEquals(missing, [("foo", fakenode)])

    def testAddThrows(self):
        pack = self.createPack()

        try:
            pack.add("filename", nullid, "contents")
            self.assertTrue(False, "datapack.add should throw")
        except (AttributeError, RuntimeError):
            pass

    def testBadVersionThrows(self):
        pack = self.createPack()
        path = pack.path() + ".datapack"
        with open(path) as f:
            raw = f.read()
        raw = struct.pack("!B", 255) + raw[1:]
        os.chmod(path, os.stat(path).st_mode | stat.S_IWRITE)
        with open(path, "w+") as f:
            f.write(raw)

        try:
            pack = self.datapackreader(pack.path())
            self.assertTrue(False, "bad version number should have thrown")
        except RuntimeError:
            pass

    def testMissingDeltabase(self):
        fakenode = self.getFakeHash()
        revisions = [("filename", fakenode, self.getFakeHash(), "content")]
        pack = self.createPack(revisions)
        chain = pack.getdeltachain("filename", fakenode)
        self.assertEquals(len(chain), 1)

    def testLargePack(self):
        """Test creating and reading from a large pack with over X entries.
        This causes it to use a 2^16 fanout table instead."""
        revisions = []
        blobs = {}
        total = SMALLFANOUTCUTOFF + 1
        for i in xrange(total):
            filename = "filename-%s" % i
            content = filename
            node = self.getHash(content)
            blobs[(filename, node)] = content
            revisions.append((filename, node, nullid, content))

        pack = self.createPack(revisions)
        if self.paramsavailable:
            self.assertEquals(pack.params.fanoutprefix, LARGEFANOUTPREFIX)

        for (filename, node), content in blobs.iteritems():
            actualcontent = pack.getdeltachain(filename, node)[0][4]
            self.assertEquals(actualcontent, content)

    def testPacksCache(self):
        """Test that we remember the most recent packs while fetching the delta
        chain."""

        packdir = self.makeTempDir()
        deltachains = []

        if self.iscdatapack:
            numpacks = 200
        else:
            numpacks = 10
        revisionsperpack = 100

        for i in range(numpacks):
            chain = []
            revision = (str(i), self.getFakeHash(), nullid, "content")

            for _ in range(revisionsperpack):
                chain.append(revision)
                revision = (str(i), self.getFakeHash(), revision[1], self.getFakeHash())

            self.createPack(chain, packdir)
            deltachains.append(chain)

        class testdatapackstore(datapackstore):
            # Ensures that we are not keeping everything in the cache.
            DEFAULTCACHESIZE = numpacks / 2

        store = testdatapackstore(uimod.ui(), packdir, self.iscdatapack)

        random.shuffle(deltachains)
        for randomchain in deltachains:
            revision = random.choice(randomchain)
            chain = store.getdeltachain(revision[0], revision[1])

            mostrecentpack = next(iter(store.packs), None)
            self.assertEquals(
                mostrecentpack.getdeltachain(revision[0], revision[1]), chain
            )

            self.assertEquals(randomchain.index(revision) + 1, len(chain))

    def testCorruptPackHandling(self):
        """Test that the pack store deletes corrupt packs."""
        # There's a bug in cdatapack right now that causes it to return bad data
        # even if the pack is corrupt. Since we're not getting an exception, we
        # can't detect the corruption and remediate. Let's wait for the rust
        # implementation to deprecate the C implementation then this will be
        # easier to fix.
        if self.iscdatapack:
            return

        packdir = self.makeTempDir()
        deltachains = []

        numpacks = 5
        revisionsperpack = 100

        firstpack = None
        secondindex = None
        for i in range(numpacks):
            chain = []
            revision = (str(i), self.getFakeHash(), nullid, "content")

            for _ in range(revisionsperpack):
                chain.append(revision)
                revision = (str(i), self.getFakeHash(), revision[1], self.getFakeHash())

            pack = self.createPack(chain, packdir)
            if firstpack is None:
                firstpack = pack.packpath()
            elif secondindex is None:
                secondindex = pack.indexpath()

            deltachains.append(chain)

        ui = uimod.ui()
        store = datapackstore(ui, packdir, self.iscdatapack, deletecorruptpacks=True)

        key = (deltachains[0][0][0], deltachains[0][0][1])
        # Count packs
        origpackcount = len(os.listdir(packdir))

        # Read key
        store.getdelta(*key)

        # Corrupt the pack
        os.chmod(firstpack, 0o644)
        f = open(firstpack, "w")
        f.truncate(1)
        f.close()

        # Re-create the store. Otherwise the behavior is kind of "undefined"
        # because the size of mmap-ed memory isn't truncated automatically,
        # and is filled by 0.
        store = datapackstore(ui, packdir, self.iscdatapack, deletecorruptpacks=True)

        # Look for key again
        try:
            ui.pushbuffer(error=True)
            delta = store.getdelta(*key)
            raise RuntimeError("getdelta on corrupt key should fail %s" % repr(delta))
        except KeyError:
            pass
        ui.popbuffer()

        # Count packs
        newpackcount = len(os.listdir(packdir))

        # Assert the corrupt pack was removed
        self.assertEquals(origpackcount - 2, newpackcount)

        # Corrupt the index
        os.chmod(secondindex, 0o644)
        f = open(secondindex, "w")
        f.truncate(1)
        f.close()

        # Load the packs
        origpackcount = len(os.listdir(packdir))
        ui.pushbuffer(error=True)
        store = datapackstore(ui, packdir, self.iscdatapack, deletecorruptpacks=True)
        ui.popbuffer()
        newpackcount = len(os.listdir(packdir))

        # Assert the corrupt pack was removed
        self.assertEquals(origpackcount - 2, newpackcount)

    def testReadingMutablePack(self):
        """Tests that the data written into a mutabledatapack can be read out
        before it has been finalized."""
        packdir = self.makeTempDir()
        packer = mutabledatapack(uimod.ui(), packdir, version=1)

        # Add some unused first revision for noise
        packer.add("qwert", self.getFakeHash(), self.getFakeHash(), "qwertcontent")

        filename = "filename1"
        node = self.getFakeHash()
        base = self.getFakeHash()
        content = "asdf"
        meta = {
            constants.METAKEYFLAG: 1,
            constants.METAKEYSIZE: len(content),
            "Z": "random_string",
            "_": "\0" * 40,
        }
        packer.add(filename, node, base, content, metadata=meta)

        # Add some unused third revision for noise
        packer.add("zxcv", self.getFakeHash(), self.getFakeHash(), "zcxvcontent")

        # Test getmissing
        missing = ("", self.getFakeHash())
        value = packer.getmissing([missing, (filename, node)])
        self.assertEquals(value, [missing])

        # Test getmeta
        value = packer.getmeta(filename, node)
        self.assertEquals(value, meta)

        # Test getdelta
        value = packer.getdelta(filename, node)
        self.assertEquals(value, (content, filename, base, meta))

        # Test getdeltachain
        value = packer.getdeltachain(filename, node)
        self.assertEquals(value, [(filename, node, filename, base, content)])

    # perf test off by default since it's slow
    def _testIndexPerf(self):
        random.seed(0)
        print("Multi-get perf test")
        packsizes = [100, 10000, 100000, 500000, 1000000, 3000000]
        lookupsizes = [10, 100, 1000, 10000, 100000, 1000000]
        for packsize in packsizes:
            revisions = []
            for i in xrange(packsize):
                filename = "filename-%s" % i
                content = "content-%s" % i
                node = self.getHash(content)
                revisions.append((filename, node, nullid, content))

            path = self.createPack(revisions).path()

            # Perf of large multi-get
            import gc

            gc.disable()
            pack = self.datapackreader(path)
            for lookupsize in lookupsizes:
                if lookupsize > packsize:
                    continue
                random.shuffle(revisions)
                findnodes = [(rev[0], rev[1]) for rev in revisions]

                start = time.time()
                pack.getmissing(findnodes[:lookupsize])
                elapsed = time.time() - start
                print(
                    "%s pack %s lookups = %0.04f"
                    % (
                        ("%s" % packsize).rjust(7),
                        ("%s" % lookupsize).rjust(7),
                        elapsed,
                    )
                )

            print("")
            gc.enable()

        # The perf test is meant to produce output, so we always fail the test
        # so the user sees the output.
        raise RuntimeError("perf test always fails")


class datapacktests(datapacktestsbase, unittest.TestCase):
    def __init__(self, *args, **kwargs):
        datapacktestsbase.__init__(self, datapack, True, False)
        unittest.TestCase.__init__(self, *args, **kwargs)


class fastdatapacktests(datapacktestsbase, unittest.TestCase):
    def __init__(self, *args, **kwargs):
        datapacktestsbase.__init__(self, fastdatapack, False, True)
        unittest.TestCase.__init__(self, *args, **kwargs)


class rustdatapacktests(datapacktestsbase, unittest.TestCase):
    def __init__(self, *args, **kwargs):
        datapacktestsbase.__init__(self, rustdatapack, False, True)
        unittest.TestCase.__init__(self, *args, **kwargs)


# TODO:
# datapack store:
# - getmissing
# - GC two packs into one

if __name__ == "__main__":
    silenttestrunner.main(__name__)