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// 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.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;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Singleton
public class EventsStorage {
private static final Logger log = LoggerFactory.getLogger(EventsStorage.class);
public static class ReplicateRefUpdate {
public String project;
public String 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) {
log.warn("Couldn't persist event {}", json);
}
return eventKey;
}
public void delete(String eventKey) {
if (eventKey != null) {
try {
Files.delete(refUpdates().resolve(eventKey));
} catch (IOException e) {
log.error("Error while deleting event {}", eventKey, e);
}
}
}
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) {
log.error("Error when firing pending events", e);
}
return result;
}
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);
}
}
}
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