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- /*
- * Copyright (C) 2011, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.internal.storage.dfs;
-
- import static org.eclipse.jgit.internal.storage.pack.PackExt.PACK;
-
- import java.io.EOFException;
- import java.io.IOException;
- import java.io.InputStream;
- import java.nio.ByteBuffer;
- import java.security.MessageDigest;
- import java.util.Collections;
- import java.util.List;
- import java.util.zip.CRC32;
- import java.util.zip.Deflater;
-
- import org.eclipse.jgit.internal.storage.file.PackIndex;
- import org.eclipse.jgit.internal.storage.file.PackLock;
- import org.eclipse.jgit.lib.AnyObjectId;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.ProgressMonitor;
- import org.eclipse.jgit.transport.PackParser;
- import org.eclipse.jgit.transport.PackedObjectInfo;
-
- /**
- * Parses a pack stream into the DFS, by creating a new pack and index.
- */
- public class DfsPackParser extends PackParser {
- private final DfsObjDatabase objdb;
-
- private final DfsInserter objins;
-
- /** CRC-32 computation for objects that are appended onto the pack. */
- private final CRC32 crc;
-
- /** Running SHA-1 of the entire pack stream. */
- private final MessageDigest packDigest;
-
- /** Block size to use when caching data for read back. */
- private int blockSize;
-
- /** Current end of the pack file. */
- private long packEnd;
-
- /** Checksum of the entire pack file. */
- private byte[] packHash;
-
- /** Compresses delta bases when completing a thin pack. */
- private Deflater def;
-
- /** True if the pack is an empty pack. */
- private boolean isEmptyPack;
-
- /** Name of the pack file, computed in {@link #onPackHeader(long)}. */
- private DfsPackDescription packDsc;
-
- /** Key used during delta resolution reading delta chains. */
- private DfsStreamKey packKey;
-
- /** If the index was small enough, the entire index after writing. */
- private PackIndex packIndex;
-
- /** Stream to the DFS storage, opened during {@link #onPackHeader(long)}. */
- private DfsOutputStream out;
-
- /** Data being written that has not yet been cached. */
- private byte[] currBuf;
- private long currPos; // Position of currBuf in the file.
- private int currEnd; // Position inside of currBuf to append to next.
-
- /** Cache the chunks were stored into or get read back from. */
- private DfsBlockCache blockCache;
-
- /** Cached block that is being read. */
- private long readPos;
- private DfsBlock readBlock;
-
- /**
- * Initialize a new pack parser.
- *
- * @param db
- * database the objects will be imported into.
- * @param ins
- * inserter the parser will use to help it inject the objects.
- * @param in
- * the stream to parse.
- */
- protected DfsPackParser(DfsObjDatabase db, DfsInserter ins, InputStream in) {
- super(db, in);
- this.objdb = db;
- this.objins = ins;
- this.crc = new CRC32();
- this.packDigest = Constants.newMessageDigest();
- }
-
- /** {@inheritDoc} */
- @Override
- public PackLock parse(ProgressMonitor receiving, ProgressMonitor resolving)
- throws IOException {
- boolean rollback = true;
- try {
- blockCache = DfsBlockCache.getInstance();
- super.parse(receiving, resolving);
- if (isEmptyPack)
- return null;
- buffer(packHash, 0, packHash.length);
- if (currEnd != 0)
- flushBlock();
- out.close();
- out = null;
- currBuf = null;
- readBlock = null;
- packDsc.addFileExt(PACK);
- packDsc.setFileSize(PACK, packEnd);
- packDsc.setBlockSize(PACK, blockSize);
-
- writePackIndex();
- objdb.commitPack(Collections.singletonList(packDsc), null);
- rollback = false;
-
- DfsPackFile p = new DfsPackFile(blockCache, packDsc);
- p.setBlockSize(blockSize);
- if (packIndex != null)
- p.setPackIndex(packIndex);
-
- objdb.addPack(p);
-
- return null;
- } finally {
- blockCache = null;
- currBuf = null;
- readBlock = null;
-
- if (def != null) {
- def.end();
- def = null;
- }
-
- if (out != null) {
- try {
- out.close();
- } catch (IOException err) {
- // Ignore a close error, rollbackPack is also important.
- }
- out = null;
- }
-
- if (rollback && packDsc != null) {
- try {
- objdb.rollbackPack(Collections.singletonList(packDsc));
- } finally {
- packDsc = null;
- }
- }
- }
- }
-
- /**
- * Get description of the imported pack, if one was made.
- *
- * @return description of the imported pack, if one was made.
- */
- public DfsPackDescription getPackDescription() {
- return packDsc;
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onPackHeader(long objectCount) throws IOException {
- if (objectCount == 0) {
- isEmptyPack = true;
- currBuf = new byte[256];
- return;
- }
-
- packDsc = objdb.newPack(DfsObjDatabase.PackSource.RECEIVE);
- out = objdb.writeFile(packDsc, PACK);
- packKey = packDsc.getStreamKey(PACK);
-
- int size = out.blockSize();
- if (size <= 0)
- size = blockCache.getBlockSize();
- else if (size < blockCache.getBlockSize())
- size = (blockCache.getBlockSize() / size) * size;
- blockSize = size;
- currBuf = new byte[blockSize];
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onBeginWholeObject(long streamPosition, int type,
- long inflatedSize) throws IOException {
- crc.reset();
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onEndWholeObject(PackedObjectInfo info) throws IOException {
- info.setCRC((int) crc.getValue());
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onBeginOfsDelta(long streamPosition,
- long baseStreamPosition, long inflatedSize) throws IOException {
- crc.reset();
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onBeginRefDelta(long streamPosition, AnyObjectId baseId,
- long inflatedSize) throws IOException {
- crc.reset();
- }
-
- /** {@inheritDoc} */
- @Override
- protected UnresolvedDelta onEndDelta() throws IOException {
- UnresolvedDelta delta = new UnresolvedDelta();
- delta.setCRC((int) crc.getValue());
- return delta;
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onInflatedObjectData(PackedObjectInfo obj, int typeCode,
- byte[] data) throws IOException {
- // DfsPackParser ignores this event.
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onObjectHeader(Source src, byte[] raw, int pos, int len)
- throws IOException {
- crc.update(raw, pos, len);
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onObjectData(Source src, byte[] raw, int pos, int len)
- throws IOException {
- crc.update(raw, pos, len);
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onStoreStream(byte[] raw, int pos, int len)
- throws IOException {
- buffer(raw, pos, len);
- packDigest.update(raw, pos, len);
- }
-
- private void buffer(byte[] raw, int pos, int len) throws IOException {
- while (0 < len) {
- int n = Math.min(len, currBuf.length - currEnd);
- if (n == 0) {
- DfsBlock v = flushBlock();
- currBuf = new byte[blockSize];
- currEnd = 0;
- currPos += v.size();
- continue;
- }
-
- System.arraycopy(raw, pos, currBuf, currEnd, n);
- pos += n;
- len -= n;
- currEnd += n;
- packEnd += n;
- }
- }
-
- private DfsBlock flushBlock() throws IOException {
- if (isEmptyPack)
- throw new IOException(DfsText.get().willNotStoreEmptyPack);
-
- out.write(currBuf, 0, currEnd);
-
- byte[] buf;
- if (currEnd == currBuf.length) {
- buf = currBuf;
- } else {
- buf = new byte[currEnd];
- System.arraycopy(currBuf, 0, buf, 0, currEnd);
- }
-
- DfsBlock v = new DfsBlock(packKey, currPos, buf);
- readBlock = v;
- blockCache.put(v);
- return v;
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onPackFooter(byte[] hash) throws IOException {
- // The base class will validate the original hash matches
- // what the stream has stored at the end. We are called
- // only if the hash was good. Save it in case there are no
- // missing bases to append.
- packHash = hash;
- }
-
- /** {@inheritDoc} */
- @Override
- protected ObjectTypeAndSize seekDatabase(PackedObjectInfo obj,
- ObjectTypeAndSize info) throws IOException {
- readPos = obj.getOffset();
- crc.reset();
- return readObjectHeader(info);
- }
-
- /** {@inheritDoc} */
- @Override
- protected ObjectTypeAndSize seekDatabase(UnresolvedDelta delta,
- ObjectTypeAndSize info) throws IOException {
- readPos = delta.getOffset();
- crc.reset();
- return readObjectHeader(info);
- }
-
- /** {@inheritDoc} */
- @Override
- protected int readDatabase(byte[] dst, int pos, int cnt) throws IOException {
- if (cnt == 0)
- return 0;
-
- if (currPos <= readPos) {
- // Requested read is still buffered. Copy direct from buffer.
- int p = (int) (readPos - currPos);
- int n = Math.min(cnt, currEnd - p);
- if (n == 0)
- throw new EOFException();
- System.arraycopy(currBuf, p, dst, pos, n);
- readPos += n;
- return n;
- }
-
- if (readBlock == null || !readBlock.contains(packKey, readPos)) {
- long start = toBlockStart(readPos);
- readBlock = blockCache.get(packKey, start);
- if (readBlock == null) {
- int size = (int) Math.min(blockSize, packEnd - start);
- byte[] buf = new byte[size];
- if (read(start, buf, 0, size) != size)
- throw new EOFException();
- readBlock = new DfsBlock(packKey, start, buf);
- blockCache.put(readBlock);
- }
- }
-
- int n = readBlock.copy(readPos, dst, pos, cnt);
- readPos += n;
- return n;
- }
-
- private int read(long pos, byte[] dst, int off, int len) throws IOException {
- if (len == 0)
- return 0;
-
- int cnt = 0;
- while (0 < len) {
- int r = out.read(pos, ByteBuffer.wrap(dst, off, len));
- if (r <= 0)
- break;
- pos += r;
- off += r;
- len -= r;
- cnt += r;
- }
- return cnt != 0 ? cnt : -1;
- }
-
- private long toBlockStart(long pos) {
- return (pos / blockSize) * blockSize;
- }
-
- /** {@inheritDoc} */
- @Override
- protected boolean checkCRC(int oldCRC) {
- return oldCRC == (int) crc.getValue();
- }
-
- /** {@inheritDoc} */
- @Override
- protected boolean onAppendBase(final int typeCode, final byte[] data,
- final PackedObjectInfo info) throws IOException {
- info.setOffset(packEnd);
-
- final byte[] buf = buffer();
- int sz = data.length;
- int len = 0;
- buf[len++] = (byte) ((typeCode << 4) | (sz & 15));
- sz >>>= 4;
- while (sz > 0) {
- buf[len - 1] |= (byte) 0x80;
- buf[len++] = (byte) (sz & 0x7f);
- sz >>>= 7;
- }
-
- packDigest.update(buf, 0, len);
- crc.reset();
- crc.update(buf, 0, len);
- buffer(buf, 0, len);
-
- if (def == null)
- def = new Deflater(Deflater.DEFAULT_COMPRESSION, false);
- else
- def.reset();
- def.setInput(data);
- def.finish();
-
- while (!def.finished()) {
- len = def.deflate(buf);
- packDigest.update(buf, 0, len);
- crc.update(buf, 0, len);
- buffer(buf, 0, len);
- }
-
- info.setCRC((int) crc.getValue());
- return true;
- }
-
- /** {@inheritDoc} */
- @Override
- protected void onEndThinPack() throws IOException {
- // Normally when a thin pack is closed the pack header gets
- // updated to reflect the actual object count. This is not going
- // to be possible on most DFS backends, so instead we allow
- // the header to have an incorrect count, but we do change the
- // trailing digest to be correct.
- packHash = packDigest.digest();
- }
-
- private void writePackIndex() throws IOException {
- List<PackedObjectInfo> list = getSortedObjectList(null /* by ObjectId */);
- packIndex = objins.writePackIndex(packDsc, packHash, list);
- }
- }
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