- /*
- * Copyright (C) 2016, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.internal.ketch;
-
- import static org.eclipse.jgit.internal.ketch.KetchReplica.CommitMethod.ALL_REFS;
- import static org.eclipse.jgit.lib.Ref.Storage.NETWORK;
- import static org.eclipse.jgit.transport.ReceiveCommand.Result.LOCK_FAILURE;
- 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_NODELETE;
- import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTFORWARD;
- import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_REASON;
-
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.LinkedHashMap;
- import java.util.List;
- import java.util.Map;
-
- import org.eclipse.jgit.annotations.Nullable;
- import org.eclipse.jgit.errors.NotSupportedException;
- import org.eclipse.jgit.errors.TransportException;
- import org.eclipse.jgit.lib.AnyObjectId;
- import org.eclipse.jgit.lib.NullProgressMonitor;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ObjectIdRef;
- import org.eclipse.jgit.lib.Ref;
- import org.eclipse.jgit.lib.Repository;
- import org.eclipse.jgit.transport.FetchConnection;
- import org.eclipse.jgit.transport.PushConnection;
- import org.eclipse.jgit.transport.ReceiveCommand;
- import org.eclipse.jgit.transport.RemoteConfig;
- import org.eclipse.jgit.transport.RemoteRefUpdate;
- import org.eclipse.jgit.transport.Transport;
- import org.eclipse.jgit.transport.URIish;
-
- /**
- * Representation of a Git repository on a remote replica system.
- * <p>
- * {@link org.eclipse.jgit.internal.ketch.KetchLeader} will contact the replica
- * using the Git wire protocol.
- * <p>
- * The remote replica may be fully Ketch-aware, or a standard Git server.
- */
- public class RemoteGitReplica extends KetchReplica {
- private final URIish uri;
- private final RemoteConfig remoteConfig;
-
- /**
- * Configure a new remote.
- *
- * @param leader
- * instance this replica follows.
- * @param name
- * unique-ish name identifying this remote for debugging.
- * @param uri
- * URI to connect to the follower's repository.
- * @param cfg
- * how Ketch should treat the remote system.
- * @param rc
- * optional remote configuration describing how to contact the
- * peer repository.
- */
- public RemoteGitReplica(KetchLeader leader, String name, URIish uri,
- ReplicaConfig cfg, @Nullable RemoteConfig rc) {
- super(leader, name, cfg);
- this.uri = uri;
- this.remoteConfig = rc;
- }
-
- /**
- * Get URI to contact the remote peer repository.
- *
- * @return URI to contact the remote peer repository.
- */
- public URIish getURI() {
- return uri;
- }
-
- /**
- * Get optional configuration describing how to contact the peer.
- *
- * @return optional configuration describing how to contact the peer.
- */
- @Nullable
- protected RemoteConfig getRemoteConfig() {
- return remoteConfig;
- }
-
- /** {@inheritDoc} */
- @Override
- protected String describeForLog() {
- return String.format("%s @ %s", getName(), getURI()); //$NON-NLS-1$
- }
-
- /** {@inheritDoc} */
- @Override
- protected void startPush(ReplicaPushRequest req) {
- getSystem().getExecutor().execute(() -> {
- try (Repository git = getLeader().openRepository()) {
- try {
- push(git, req);
- req.done(git);
- } catch (Throwable err) {
- req.setException(git, err);
- }
- } catch (IOException err) {
- req.setException(null, err);
- }
- });
- }
-
- private void push(Repository repo, ReplicaPushRequest req)
- throws NotSupportedException, TransportException, IOException {
- Map<String, Ref> adv;
- List<RemoteCommand> cmds = asUpdateList(req.getCommands());
- try (Transport transport = Transport.open(repo, uri)) {
- RemoteConfig rc = getRemoteConfig();
- if (rc != null) {
- transport.applyConfig(rc);
- }
- transport.setPushAtomic(true);
- adv = push(repo, transport, cmds);
- }
- for (RemoteCommand c : cmds) {
- c.copyStatusToResult();
- }
- req.setRefs(adv);
- }
-
- private Map<String, Ref> push(Repository git, Transport transport,
- List<RemoteCommand> cmds) throws IOException {
- Map<String, RemoteRefUpdate> updates = asUpdateMap(cmds);
- try (PushConnection connection = transport.openPush()) {
- Map<String, Ref> adv = connection.getRefsMap();
- RemoteRefUpdate accepted = updates.get(getSystem().getTxnAccepted());
- if (accepted != null && !isExpectedValue(adv, accepted)) {
- abort(cmds);
- return adv;
- }
-
- RemoteRefUpdate committed = updates.get(getSystem().getTxnCommitted());
- if (committed != null && !isExpectedValue(adv, committed)) {
- abort(cmds);
- return adv;
- }
- if (committed != null && getCommitMethod() == ALL_REFS) {
- prepareCommit(git, cmds, updates, adv,
- committed.getNewObjectId());
- }
-
- connection.push(NullProgressMonitor.INSTANCE, updates);
- return adv;
- }
- }
-
- private static boolean isExpectedValue(Map<String, Ref> adv,
- RemoteRefUpdate u) {
- Ref r = adv.get(u.getRemoteName());
- if (!AnyObjectId.isEqual(getId(r), u.getExpectedOldObjectId())) {
- ((RemoteCommand) u).cmd.setResult(LOCK_FAILURE);
- return false;
- }
- return true;
- }
-
- private void prepareCommit(Repository git, List<RemoteCommand> cmds,
- Map<String, RemoteRefUpdate> updates, Map<String, Ref> adv,
- ObjectId committed) throws IOException {
- for (ReceiveCommand cmd : prepareCommit(git, adv, committed)) {
- RemoteCommand c = new RemoteCommand(cmd);
- cmds.add(c);
- updates.put(c.getRemoteName(), c);
- }
- }
-
- private static List<RemoteCommand> asUpdateList(
- Collection<ReceiveCommand> cmds) {
- try {
- List<RemoteCommand> toPush = new ArrayList<>(cmds.size());
- for (ReceiveCommand cmd : cmds) {
- toPush.add(new RemoteCommand(cmd));
- }
- return toPush;
- } catch (IOException e) {
- // Cannot occur as no IO was required to build the command.
- throw new IllegalStateException(e);
- }
- }
-
- private static Map<String, RemoteRefUpdate> asUpdateMap(
- List<RemoteCommand> cmds) {
- Map<String, RemoteRefUpdate> m = new LinkedHashMap<>();
- for (RemoteCommand cmd : cmds) {
- m.put(cmd.getRemoteName(), cmd);
- }
- return m;
- }
-
- private static void abort(List<RemoteCommand> cmds) {
- List<ReceiveCommand> tmp = new ArrayList<>(cmds.size());
- for (RemoteCommand cmd : cmds) {
- tmp.add(cmd.cmd);
- }
- ReceiveCommand.abort(tmp);
- }
-
- /** {@inheritDoc} */
- @Override
- protected void blockingFetch(Repository repo, ReplicaFetchRequest req)
- throws NotSupportedException, TransportException {
- try (Transport transport = Transport.open(repo, uri)) {
- RemoteConfig rc = getRemoteConfig();
- if (rc != null) {
- transport.applyConfig(rc);
- }
- fetch(transport, req);
- }
- }
-
- private void fetch(Transport transport, ReplicaFetchRequest req)
- throws NotSupportedException, TransportException {
- try (FetchConnection conn = transport.openFetch()) {
- Map<String, Ref> remoteRefs = conn.getRefsMap();
- req.setRefs(remoteRefs);
-
- List<Ref> want = new ArrayList<>();
- for (String name : req.getWantRefs()) {
- Ref ref = remoteRefs.get(name);
- if (ref != null && ref.getObjectId() != null) {
- want.add(ref);
- }
- }
- for (ObjectId id : req.getWantObjects()) {
- want.add(new ObjectIdRef.Unpeeled(NETWORK, id.name(), id));
- }
-
- conn.fetch(NullProgressMonitor.INSTANCE, want,
- Collections.<ObjectId> emptySet());
- }
- }
-
- static class RemoteCommand extends RemoteRefUpdate {
- final ReceiveCommand cmd;
-
- RemoteCommand(ReceiveCommand cmd) throws IOException {
- super(null, null,
- cmd.getNewId(), cmd.getRefName(),
- true /* force update */,
- null /* no local tracking ref */,
- cmd.getOldId());
- this.cmd = cmd;
- }
-
- void copyStatusToResult() {
- if (cmd.getResult() == NOT_ATTEMPTED) {
- switch (getStatus()) {
- case OK:
- case UP_TO_DATE:
- case NON_EXISTING:
- cmd.setResult(OK);
- break;
-
- case REJECTED_NODELETE:
- cmd.setResult(REJECTED_NODELETE);
- break;
-
- case REJECTED_NONFASTFORWARD:
- cmd.setResult(REJECTED_NONFASTFORWARD);
- break;
-
- case REJECTED_OTHER_REASON:
- cmd.setResult(REJECTED_OTHER_REASON, getMessage());
- break;
-
- default:
- cmd.setResult(REJECTED_OTHER_REASON, getStatus().name());
- break;
- }
- }
- }
- }
- }
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