| // Copyright (C) 2018 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.replication; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import com.google.common.flogger.FluentLogger; |
| import com.google.common.hash.Hashing; |
| import com.google.gson.Gson; |
| import com.google.inject.Inject; |
| import com.google.inject.ProvisionException; |
| import com.google.inject.Singleton; |
| import java.io.IOException; |
| import java.nio.file.DirectoryStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.eclipse.jgit.lib.ObjectId; |
| |
| @Singleton |
| public class EventsStorage { |
| private static final FluentLogger logger = FluentLogger.forEnclosingClass(); |
| |
| public static class ReplicateRefUpdate { |
| public String project; |
| public String ref; |
| |
| @Override |
| public String toString() { |
| return "ref-update " + project + ":" + ref; |
| } |
| } |
| |
| private static Gson GSON = new Gson(); |
| |
| private final Path refUpdates; |
| |
| @Inject |
| EventsStorage(ReplicationConfig config) { |
| refUpdates = config.getEventsDirectory().resolve("ref-updates"); |
| } |
| |
| public String persist(String project, String ref) { |
| ReplicateRefUpdate r = new ReplicateRefUpdate(); |
| r.project = project; |
| r.ref = ref; |
| |
| String json = GSON.toJson(r) + "\n"; |
| String eventKey = sha1(json).name(); |
| Path file = refUpdates().resolve(eventKey); |
| |
| if (Files.exists(file)) { |
| return eventKey; |
| } |
| |
| try { |
| Files.write(file, json.getBytes(UTF_8)); |
| } catch (IOException e) { |
| logger.atWarning().log("Couldn't persist event %s", json); |
| } |
| return eventKey; |
| } |
| |
| public void delete(String eventKey) { |
| if (eventKey != null) { |
| try { |
| Files.delete(refUpdates().resolve(eventKey)); |
| } catch (IOException e) { |
| logger.atSevere().withCause(e).log("Error while deleting event %s", eventKey); |
| } |
| } |
| } |
| |
| public List<ReplicateRefUpdate> list() { |
| ArrayList<ReplicateRefUpdate> result = new ArrayList<>(); |
| try (DirectoryStream<Path> events = Files.newDirectoryStream(refUpdates())) { |
| for (Path e : events) { |
| if (Files.isRegularFile(e)) { |
| String json = new String(Files.readAllBytes(e), UTF_8); |
| result.add(GSON.fromJson(json, ReplicateRefUpdate.class)); |
| Files.delete(e); |
| } |
| } |
| } catch (IOException e) { |
| logger.atSevere().withCause(e).log("Error when firing pending events"); |
| } |
| return result; |
| } |
| |
| @SuppressWarnings("deprecation") |
| private ObjectId sha1(String s) { |
| return ObjectId.fromRaw(Hashing.sha1().hashString(s, UTF_8).asBytes()); |
| } |
| |
| private Path refUpdates() { |
| try { |
| return Files.createDirectories(refUpdates); |
| } catch (IOException e) { |
| throw new ProvisionException(String.format("Couldn't create %s", refUpdates), e); |
| } |
| } |
| } |