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// Copyright (C) 2019 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.googlesource.gerrit.plugins.analytics.common
import com.google.common.cache.CacheLoader
import com.google.gerrit.extensions.api.projects.CommentLinkInfo
import com.google.gerrit.reviewdb.client.Project
import com.google.gerrit.server.git.GitRepositoryManager
import com.google.gerrit.server.project.ProjectCache
import com.google.inject.Inject
import com.googlesource.gerrit.plugins.analytics.{CommitInfo, IssueInfo}
import com.googlesource.gerrit.plugins.analytics.common.ManagedResource.use
import org.eclipse.jgit.diff.{DiffFormatter, RawTextComparator}
import org.eclipse.jgit.revwalk.RevWalk
import org.eclipse.jgit.treewalk.{CanonicalTreeParser, EmptyTreeIterator}
import org.eclipse.jgit.util.io.DisabledOutputStream
import scala.collection.JavaConverters._
import scala.util.matching.Regex
class CommitsStatisticsLoader @Inject() (gitRepositoryManager: GitRepositoryManager, projectCache: ProjectCache, botLikeExtractor: BotLikeExtractor) extends CacheLoader[CommitsStatisticsCacheKey, CommitsStatistics] {
override def load(cacheKey: CommitsStatisticsCacheKey): CommitsStatistics = {
import RevisionBrowsingSupport._
val objectId = cacheKey.commitId
val nameKey = new Project.NameKey(cacheKey.projectName)
val commentInfoList: Seq[CommentLinkInfo] = projectCache.get(nameKey).getCommentLinks.asScala
val replacers = commentInfoList.map(info =>
Replacer(
info.`match`.r,
Option(info.link).getOrElse(info.html)))
use(gitRepositoryManager.openRepository(nameKey)) { repo =>
// I can imagine this kind of statistics is already being available in Gerrit but couldn't understand how to access it
// which Injection can be useful for this task?
use(new RevWalk(repo)) { rw =>
val reader = repo.newObjectReader()
val commit = rw.parseCommit(objectId)
val commitMessage = commit.getFullMessage
val oldTree = {
// protects against initial commit
if (commit.getParentCount == 0)
new EmptyTreeIterator
else
new CanonicalTreeParser(null, reader, rw.parseCommit(commit.getParent(0).getId).getTree)
}
val newTree = new CanonicalTreeParser(null, reader, commit.getTree)
val df = new DiffFormatter(DisabledOutputStream.INSTANCE)
df.setRepository(repo)
df.setDiffComparator(RawTextComparator.DEFAULT)
df.setDetectRenames(true)
val diffs = df.scan(oldTree, newTree).asScala
val lines = (for {
diff <- diffs
edit <- df.toFileHeader(diff).toEditList.asScala
} yield Lines(edit.getEndA - edit.getBeginA, edit.getEndB - edit.getBeginB)).fold(Lines(0, 0))(_ + _)
val files: Set[String] = diffs.map(df.toFileHeader(_).getNewPath).toSet
val commitInfo = CommitInfo(objectId.getName, commit.getAuthorIdent.getWhen.getTime, commit.isMerge, botLikeExtractor.isBotLike(files), files)
val commitsStats = CommitsStatistics(lines.added, lines.deleted, commitInfo.merge, commitInfo.botLike, List(commitInfo), extractIssues(commitMessage, replacers).toList)
commitsStats
}
}
}
private def extractIssues(commitMessage: String, replacers: Seq[Replacer]): Seq[IssueInfo] =
replacers.flatMap {
case Replacer(pattern, replaced) =>
pattern.findAllIn(commitMessage)
.map(code => {
val transformed = pattern.replaceAllIn(code, replaced)
IssueInfo(code, transformed)
})
}
final private case class Replacer(pattern: Regex, replaced: String)
final private case class Lines(deleted: Int, added: Int) {
def +(other: Lines) = Lines(deleted + other.deleted, added + other.added)
}
}