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/*
* Copyright (C) 2008, Robin Rosenberg
* Copyright (C) 2008, Shawn O. Pearce
* 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.transport;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.NOT_ATTEMPTED;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.OK;
import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTFORWARD;
import static org.eclipse.jgit.transport.ReceiveCommand.Type.UPDATE_NONFASTFORWARD;
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.NotSupportedException;
import org.eclipse.jgit.errors.TransportException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.BatchRefUpdate;
import org.eclipse.jgit.lib.BatchingProgressMonitor;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ProgressMonitor;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.revwalk.ObjectWalk;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.storage.file.LockFile;
import org.eclipse.jgit.storage.file.PackLock;
class FetchProcess {
/** Transport we will fetch over. */
private final Transport transport;
/** List of things we want to fetch from the remote repository. */
private final Collection toFetch;
/** Set of refs we will actually wind up asking to obtain. */
private final HashMap askFor = new HashMap();
/** Objects we know we have locally. */
private final HashSet have = new HashSet();
/** Updates to local tracking branches (if any). */
private final ArrayList localUpdates = new ArrayList();
/** Records to be recorded into FETCH_HEAD. */
private final ArrayList fetchHeadUpdates = new ArrayList();
private final ArrayList packLocks = new ArrayList();
private FetchConnection conn;
private Map localRefs;
FetchProcess(final Transport t, final Collection f) {
transport = t;
toFetch = f;
}
void execute(final ProgressMonitor monitor, final FetchResult result)
throws NotSupportedException, TransportException {
askFor.clear();
localUpdates.clear();
fetchHeadUpdates.clear();
packLocks.clear();
localRefs = null;
try {
executeImp(monitor, result);
} finally {
try {
for (final PackLock lock : packLocks)
lock.unlock();
} catch (IOException e) {
throw new TransportException(e.getMessage(), e);
}
}
}
private void executeImp(final ProgressMonitor monitor,
final FetchResult result) throws NotSupportedException,
TransportException {
conn = transport.openFetch();
try {
result.setAdvertisedRefs(transport.getURI(), conn.getRefsMap());
final Set matched = new HashSet();
for (final RefSpec spec : toFetch) {
if (spec.getSource() == null)
throw new TransportException(MessageFormat.format(
JGitText.get().sourceRefNotSpecifiedForRefspec, spec));
if (spec.isWildcard())
expandWildcard(spec, matched);
else
expandSingle(spec, matched);
}
Collection additionalTags = Collections. emptyList();
final TagOpt tagopt = transport.getTagOpt();
if (tagopt == TagOpt.AUTO_FOLLOW)
additionalTags = expandAutoFollowTags();
else if (tagopt == TagOpt.FETCH_TAGS)
expandFetchTags();
final boolean includedTags;
if (!askFor.isEmpty() && !askForIsComplete()) {
fetchObjects(monitor);
includedTags = conn.didFetchIncludeTags();
// Connection was used for object transfer. If we
// do another fetch we must open a new connection.
//
closeConnection(result);
} else {
includedTags = false;
}
if (tagopt == TagOpt.AUTO_FOLLOW && !additionalTags.isEmpty()) {
// There are more tags that we want to follow, but
// not all were asked for on the initial request.
//
have.addAll(askFor.keySet());
askFor.clear();
for (final Ref r : additionalTags) {
ObjectId id = r.getPeeledObjectId();
if (id == null)
id = r.getObjectId();
if (transport.local.hasObject(id))
wantTag(r);
}
if (!askFor.isEmpty() && (!includedTags || !askForIsComplete())) {
reopenConnection();
if (!askFor.isEmpty())
fetchObjects(monitor);
}
}
} finally {
closeConnection(result);
}
BatchRefUpdate batch = transport.local.getRefDatabase()
.newBatchUpdate()
.setAllowNonFastForwards(true)
.setRefLogMessage("fetch", true); //$NON-NLS-1$
final RevWalk walk = new RevWalk(transport.local);
try {
if (monitor instanceof BatchingProgressMonitor) {
((BatchingProgressMonitor) monitor).setDelayStart(
250, TimeUnit.MILLISECONDS);
}
if (transport.isRemoveDeletedRefs())
deleteStaleTrackingRefs(result, batch);
for (TrackingRefUpdate u : localUpdates) {
result.add(u);
batch.addCommand(u.asReceiveCommand());
}
for (ReceiveCommand cmd : batch.getCommands()) {
cmd.updateType(walk);
if (cmd.getType() == UPDATE_NONFASTFORWARD
&& cmd instanceof TrackingRefUpdate.Command
&& !((TrackingRefUpdate.Command) cmd).canForceUpdate())
cmd.setResult(REJECTED_NONFASTFORWARD);
}
if (transport.isDryRun()) {
for (ReceiveCommand cmd : batch.getCommands()) {
if (cmd.getResult() == NOT_ATTEMPTED)
cmd.setResult(OK);
}
} else
batch.execute(walk, monitor);
} catch (IOException err) {
throw new TransportException(MessageFormat.format(
JGitText.get().failureUpdatingTrackingRef,
getFirstFailedRefName(batch), err.getMessage()), err);
} finally {
walk.release();
}
if (!fetchHeadUpdates.isEmpty()) {
try {
updateFETCH_HEAD(result);
} catch (IOException err) {
throw new TransportException(MessageFormat.format(
JGitText.get().failureUpdatingFETCH_HEAD, err.getMessage()), err);
}
}
}
private void fetchObjects(final ProgressMonitor monitor)
throws TransportException {
try {
conn.setPackLockMessage("jgit fetch " + transport.uri); //$NON-NLS-1$
conn.fetch(monitor, askFor.values(), have);
} finally {
packLocks.addAll(conn.getPackLocks());
}
if (transport.isCheckFetchedObjects()
&& !conn.didFetchTestConnectivity() && !askForIsComplete())
throw new TransportException(transport.getURI(),
JGitText.get().peerDidNotSupplyACompleteObjectGraph);
}
private void closeConnection(final FetchResult result) {
if (conn != null) {
conn.close();
result.addMessages(conn.getMessages());
conn = null;
}
}
private void reopenConnection() throws NotSupportedException,
TransportException {
if (conn != null)
return;
conn = transport.openFetch();
// Since we opened a new connection we cannot be certain
// that the system we connected to has the same exact set
// of objects available (think round-robin DNS and mirrors
// that aren't updated at the same time).
//
// We rebuild our askFor list using only the refs that the
// new connection has offered to us.
//
final HashMap avail = new HashMap();
for (final Ref r : conn.getRefs())
avail.put(r.getObjectId(), r);
final Collection wants = new ArrayList(askFor.values());
askFor.clear();
for (final Ref want : wants) {
final Ref newRef = avail.get(want.getObjectId());
if (newRef != null) {
askFor.put(newRef.getObjectId(), newRef);
} else {
removeFetchHeadRecord(want.getObjectId());
removeTrackingRefUpdate(want.getObjectId());
}
}
}
private void removeTrackingRefUpdate(final ObjectId want) {
final Iterator i = localUpdates.iterator();
while (i.hasNext()) {
final TrackingRefUpdate u = i.next();
if (u.getNewObjectId().equals(want))
i.remove();
}
}
private void removeFetchHeadRecord(final ObjectId want) {
final Iterator i = fetchHeadUpdates.iterator();
while (i.hasNext()) {
final FetchHeadRecord fh = i.next();
if (fh.newValue.equals(want))
i.remove();
}
}
private void updateFETCH_HEAD(final FetchResult result) throws IOException {
File meta = transport.local.getDirectory();
if (meta == null)
return;
final LockFile lock = new LockFile(new File(meta, "FETCH_HEAD"), //$NON-NLS-1$
transport.local.getFS());
try {
if (lock.lock()) {
final Writer w = new OutputStreamWriter(lock.getOutputStream());
try {
for (final FetchHeadRecord h : fetchHeadUpdates) {
h.write(w);
result.add(h);
}
} finally {
w.close();
}
lock.commit();
}
} finally {
lock.unlock();
}
}
private boolean askForIsComplete() throws TransportException {
try {
final ObjectWalk ow = new ObjectWalk(transport.local);
try {
for (final ObjectId want : askFor.keySet())
ow.markStart(ow.parseAny(want));
for (final Ref ref : localRefs().values())
ow.markUninteresting(ow.parseAny(ref.getObjectId()));
ow.checkConnectivity();
} finally {
ow.release();
}
return true;
} catch (MissingObjectException e) {
return false;
} catch (IOException e) {
throw new TransportException(JGitText.get().unableToCheckConnectivity, e);
}
}
private void expandWildcard(final RefSpec spec, final Set matched)
throws TransportException {
for (final Ref src : conn.getRefs()) {
if (spec.matchSource(src) && matched.add(src))
want(src, spec.expandFromSource(src));
}
}
private void expandSingle(final RefSpec spec, final Set matched)
throws TransportException {
final Ref src = conn.getRef(spec.getSource());
if (src == null) {
throw new TransportException(MessageFormat.format(JGitText.get().remoteDoesNotHaveSpec, spec.getSource()));
}
if (matched.add(src))
want(src, spec);
}
private Collection expandAutoFollowTags() throws TransportException {
final Collection additionalTags = new ArrayList();
final Map haveRefs = localRefs();
for (final Ref r : conn.getRefs()) {
if (!isTag(r))
continue;
Ref local = haveRefs.get(r.getName());
ObjectId obj = r.getObjectId();
if (r.getPeeledObjectId() == null) {
if (local != null && obj.equals(local.getObjectId()))
continue;
if (askFor.containsKey(obj) || transport.local.hasObject(obj))
wantTag(r);
else
additionalTags.add(r);
continue;
}
if (local != null) {
if (!obj.equals(local.getObjectId()))
wantTag(r);
} else if (askFor.containsKey(r.getPeeledObjectId())
|| transport.local.hasObject(r.getPeeledObjectId()))
wantTag(r);
else
additionalTags.add(r);
}
return additionalTags;
}
private void expandFetchTags() throws TransportException {
final Map haveRefs = localRefs();
for (final Ref r : conn.getRefs()) {
if (!isTag(r))
continue;
final Ref local = haveRefs.get(r.getName());
if (local == null || !r.getObjectId().equals(local.getObjectId()))
wantTag(r);
}
}
private void wantTag(final Ref r) throws TransportException {
want(r, new RefSpec().setSource(r.getName())
.setDestination(r.getName()));
}
private void want(final Ref src, final RefSpec spec)
throws TransportException {
final ObjectId newId = src.getObjectId();
if (spec.getDestination() != null) {
final TrackingRefUpdate tru = createUpdate(spec, newId);
if (newId.equals(tru.getOldObjectId()))
return;
localUpdates.add(tru);
}
askFor.put(newId, src);
final FetchHeadRecord fhr = new FetchHeadRecord();
fhr.newValue = newId;
fhr.notForMerge = spec.getDestination() != null;
fhr.sourceName = src.getName();
fhr.sourceURI = transport.getURI();
fetchHeadUpdates.add(fhr);
}
private TrackingRefUpdate createUpdate(RefSpec spec, ObjectId newId)
throws TransportException {
Ref ref = localRefs().get(spec.getDestination());
ObjectId oldId = ref != null && ref.getObjectId() != null
? ref.getObjectId()
: ObjectId.zeroId();
return new TrackingRefUpdate(
spec.isForceUpdate(),
spec.getSource(),
spec.getDestination(),
oldId,
newId);
}
private Map localRefs() throws TransportException {
if (localRefs == null) {
try {
localRefs = transport.local.getRefDatabase()
.getRefs(RefDatabase.ALL);
} catch (IOException err) {
throw new TransportException(JGitText.get().cannotListRefs, err);
}
}
return localRefs;
}
private void deleteStaleTrackingRefs(FetchResult result,
BatchRefUpdate batch) throws IOException {
for (final Ref ref : localRefs().values()) {
final String refname = ref.getName();
for (final RefSpec spec : toFetch) {
if (spec.matchDestination(refname)) {
final RefSpec s = spec.expandFromDestination(refname);
if (result.getAdvertisedRef(s.getSource()) == null) {
deleteTrackingRef(result, batch, s, ref);
}
}
}
}
}
private void deleteTrackingRef(final FetchResult result,
final BatchRefUpdate batch, final RefSpec spec, final Ref localRef) {
if (localRef.getObjectId() == null)
return;
TrackingRefUpdate update = new TrackingRefUpdate(
true,
spec.getSource(),
localRef.getName(),
localRef.getObjectId(),
ObjectId.zeroId());
result.add(update);
batch.addCommand(update.asReceiveCommand());
}
private static boolean isTag(final Ref r) {
return isTag(r.getName());
}
private static boolean isTag(final String name) {
return name.startsWith(Constants.R_TAGS);
}
private static String getFirstFailedRefName(BatchRefUpdate batch) {
for (ReceiveCommand cmd : batch.getCommands()) {
if (cmd.getResult() != ReceiveCommand.Result.OK)
return cmd.getRefName();
}
return ""; //$NON-NLS-1$
}
}
