| // Copyright (C) 2010 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.gerrit.server.git; |
| |
| import static org.eclipse.jgit.lib.RefDatabase.ALL; |
| |
| import com.google.common.collect.Maps; |
| import com.google.common.collect.Sets; |
| import com.google.gerrit.reviewdb.client.Change; |
| import com.google.gerrit.reviewdb.client.PatchSet; |
| import com.google.gerrit.reviewdb.client.Project; |
| import com.google.gerrit.reviewdb.client.RefNames; |
| import com.google.gerrit.reviewdb.server.ReviewDb; |
| import com.google.gerrit.server.util.MagicBranch; |
| import com.google.gwtorm.server.OrmException; |
| |
| import org.eclipse.jgit.lib.Constants; |
| import org.eclipse.jgit.lib.ObjectId; |
| import org.eclipse.jgit.lib.Ref; |
| import org.eclipse.jgit.revwalk.RevCommit; |
| import org.eclipse.jgit.revwalk.RevWalk; |
| import org.eclipse.jgit.transport.AdvertiseRefsHook; |
| import org.eclipse.jgit.transport.BaseReceivePack; |
| import org.eclipse.jgit.transport.ServiceMayNotContinueException; |
| import org.eclipse.jgit.transport.UploadPack; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** Exposes only the non refs/changes/ reference names. */ |
| public class ReceiveCommitsAdvertiseRefsHook implements AdvertiseRefsHook { |
| private static final Logger log = LoggerFactory |
| .getLogger(ReceiveCommitsAdvertiseRefsHook.class); |
| |
| private final ReviewDb db; |
| private final Project.NameKey projectName; |
| |
| public ReceiveCommitsAdvertiseRefsHook(ReviewDb db, |
| Project.NameKey projectName) { |
| this.db = db; |
| this.projectName = projectName; |
| } |
| |
| @Override |
| public void advertiseRefs(UploadPack us) { |
| throw new UnsupportedOperationException( |
| "ReceiveCommitsAdvertiseRefsHook cannot be used for UploadPack"); |
| } |
| |
| @Override |
| public void advertiseRefs(BaseReceivePack rp) |
| throws ServiceMayNotContinueException { |
| Map<String, Ref> oldRefs = rp.getAdvertisedRefs(); |
| if (oldRefs == null) { |
| try { |
| oldRefs = rp.getRepository().getRefDatabase().getRefs(ALL); |
| } catch (ServiceMayNotContinueException e) { |
| throw e; |
| } catch (IOException e) { |
| ServiceMayNotContinueException ex = new ServiceMayNotContinueException(); |
| ex.initCause(e); |
| throw ex; |
| } |
| } |
| Map<String, Ref> r = Maps.newHashMapWithExpectedSize(oldRefs.size()); |
| for (Map.Entry<String, Ref> e : oldRefs.entrySet()) { |
| String name = e.getKey(); |
| if (!skip(name)) { |
| r.put(name, e.getValue()); |
| } |
| } |
| rp.setAdvertisedRefs(r, advertiseHistory(r.values(), rp)); |
| } |
| |
| private Set<ObjectId> advertiseHistory( |
| Iterable<Ref> sending, |
| BaseReceivePack rp) { |
| Set<ObjectId> toInclude = Sets.newHashSet(); |
| |
| // Advertise some recent open changes, in case a commit is based one. |
| try { |
| Set<PatchSet.Id> toGet = Sets.newHashSetWithExpectedSize(32); |
| for (Change c : db.changes().byProjectOpenNext(projectName, "z", 32)) { |
| PatchSet.Id id = c.currentPatchSetId(); |
| if (id != null) { |
| toGet.add(id); |
| } |
| } |
| for (PatchSet ps : db.patchSets().get(toGet)) { |
| if (ps.getRevision() != null && ps.getRevision().get() != null) { |
| toInclude.add(ObjectId.fromString(ps.getRevision().get())); |
| } |
| } |
| } catch (OrmException err) { |
| log.error("Cannot list open changes of " + projectName, err); |
| } |
| |
| // Size of an additional ".have" line. |
| final int haveLineLen = 4 + Constants.OBJECT_ID_STRING_LENGTH + 1 + 5 + 1; |
| |
| // Maximum number of bytes to "waste" in the advertisement with |
| // a peek at this repository's current reachable history. |
| final int maxExtraSize = 8192; |
| |
| // Number of recent commits to advertise immediately, hoping to |
| // show a client a nearby merge base. |
| final int base = 64; |
| |
| // Number of commits to skip once base has already been shown. |
| final int step = 16; |
| |
| // Total number of commits to extract from the history. |
| final int max = maxExtraSize / haveLineLen; |
| |
| // Scan history until the advertisement is full. |
| Set<ObjectId> alreadySending = Sets.newHashSet(); |
| RevWalk rw = rp.getRevWalk(); |
| for (Ref ref : sending) { |
| try { |
| if (ref.getObjectId() != null) { |
| alreadySending.add(ref.getObjectId()); |
| rw.markStart(rw.parseCommit(ref.getObjectId())); |
| } |
| } catch (IOException badCommit) { |
| continue; |
| } |
| } |
| |
| int stepCnt = 0; |
| RevCommit c; |
| try { |
| while ((c = rw.next()) != null && toInclude.size() < max) { |
| if (alreadySending.contains(c)) { |
| } else if (toInclude.contains(c)) { |
| } else if (c.getParentCount() > 1) { |
| } else if (toInclude.size() < base) { |
| toInclude.add(c); |
| } else { |
| stepCnt = ++stepCnt % step; |
| if (stepCnt == 0) { |
| toInclude.add(c); |
| } |
| } |
| } |
| } catch (IOException err) { |
| log.error("Error trying to advertise history on " + projectName, err); |
| } |
| rw.reset(); |
| return toInclude; |
| } |
| |
| private static boolean skip(String name) { |
| return name.startsWith(RefNames.REFS_CHANGES) |
| || name.startsWith(RefNames.REFS_CACHE_AUTOMERGE) |
| || MagicBranch.isMagicBranch(name); |
| } |
| } |