wchevreuil commented on code in PR #4869:
URL: https://github.com/apache/hbase/pull/4869#discussion_r1018031436
##########
hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/X509Util.java:
##########
@@ -395,4 +411,57 @@ private static String[] getCipherSuites(Configuration
config) {
return cipherSuitesInput.split(",");
}
}
+
+ private static FileChangeWatcher newFileChangeWatcher(String fileLocation,
Runnable resetContext)
+ throws IOException {
+ if (fileLocation == null || fileLocation.isEmpty() || resetContext ==
null) {
+ return null;
+ }
+ final Path filePath = Paths.get(fileLocation).toAbsolutePath();
+ Path parentPath = filePath.getParent();
+ if (parentPath == null) {
+ throw new IOException("Key/trust store path does not have a parent: " +
filePath);
+ }
+ FileChangeWatcher fileChangeWatcher = new FileChangeWatcher(parentPath,
watchEvent -> {
+ handleWatchEvent(filePath, watchEvent, resetContext);
+ });
+ fileChangeWatcher.start();
+ return fileChangeWatcher;
+ }
+
+ /**
+ * Handler for watch events that let us know a file we may care about has
changed on disk.
+ * @param filePath the path to the file we are watching for changes.
+ * @param event the WatchEvent.
+ */
+ private static void handleWatchEvent(Path filePath, WatchEvent<?> event,
Runnable resetContext) {
+ boolean shouldResetContext = false;
+ Path dirPath = filePath.getParent();
+ if (event.kind().equals(StandardWatchEventKinds.OVERFLOW)) {
+ // If we get notified about possibly missed events, reload the key store
/ trust store just to
+ // be sure.
+ shouldResetContext = true;
+ } else if (
+ event.kind().equals(StandardWatchEventKinds.ENTRY_MODIFY)
+ || event.kind().equals(StandardWatchEventKinds.ENTRY_CREATE)
+ ) {
+ Path eventFilePath = dirPath.resolve((Path) event.context());
+ if (filePath.equals(eventFilePath)) {
+ shouldResetContext = true;
+ }
+ }
+ // Note: we don't care about delete events
+ if (shouldResetContext) {
+ if (LOG.isDebugEnabled()) {
Review Comment:
nit: Maybe worth info logging? My thought here is that this wouldn't be a
frequent event, yet a important one to get logged at higher level than
debugging.
##########
hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/X509Util.java:
##########
@@ -395,4 +411,57 @@ private static String[] getCipherSuites(Configuration
config) {
return cipherSuitesInput.split(",");
}
}
+
+ private static FileChangeWatcher newFileChangeWatcher(String fileLocation,
Runnable resetContext)
+ throws IOException {
+ if (fileLocation == null || fileLocation.isEmpty() || resetContext ==
null) {
+ return null;
+ }
+ final Path filePath = Paths.get(fileLocation).toAbsolutePath();
+ Path parentPath = filePath.getParent();
+ if (parentPath == null) {
+ throw new IOException("Key/trust store path does not have a parent: " +
filePath);
+ }
+ FileChangeWatcher fileChangeWatcher = new FileChangeWatcher(parentPath,
watchEvent -> {
+ handleWatchEvent(filePath, watchEvent, resetContext);
+ });
+ fileChangeWatcher.start();
+ return fileChangeWatcher;
+ }
+
+ /**
+ * Handler for watch events that let us know a file we may care about has
changed on disk.
+ * @param filePath the path to the file we are watching for changes.
+ * @param event the WatchEvent.
+ */
+ private static void handleWatchEvent(Path filePath, WatchEvent<?> event,
Runnable resetContext) {
+ boolean shouldResetContext = false;
+ Path dirPath = filePath.getParent();
+ if (event.kind().equals(StandardWatchEventKinds.OVERFLOW)) {
+ // If we get notified about possibly missed events, reload the key store
/ trust store just to
+ // be sure.
+ shouldResetContext = true;
+ } else if (
+ event.kind().equals(StandardWatchEventKinds.ENTRY_MODIFY)
+ || event.kind().equals(StandardWatchEventKinds.ENTRY_CREATE)
+ ) {
+ Path eventFilePath = dirPath.resolve((Path) event.context());
+ if (filePath.equals(eventFilePath)) {
+ shouldResetContext = true;
+ }
+ }
+ // Note: we don't care about delete events
+ if (shouldResetContext) {
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Attempting to reset default SSL context after receiving
watch event: "
+ + event.kind() + " with context: " + event.context());
+ }
+ resetContext.run();
+ } else {
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Ignoring watch event and keeping previous default SSL
context. Event kind: "
Review Comment:
nit: parameterized logging?
##########
hbase-common/src/main/java/org/apache/hadoop/hbase/io/FileChangeWatcher.java:
##########
@@ -0,0 +1,251 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.hadoop.hbase.io;
+
+import java.io.IOException;
+import java.nio.file.ClosedWatchServiceException;
+import java.nio.file.FileSystem;
+import java.nio.file.Path;
+import java.nio.file.StandardWatchEventKinds;
+import java.nio.file.WatchEvent;
+import java.nio.file.WatchKey;
+import java.nio.file.WatchService;
+import java.util.function.Consumer;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.zookeeper.server.ZooKeeperThread;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Instances of this class can be used to watch a directory for file changes.
When a file is added
+ * to, deleted from, or is modified in the given directory, the callback
provided by the user will
+ * be called from a background thread. Some things to keep in mind:
+ * <ul>
+ * <li>The callback should be thread-safe.</li>
+ * <li>Changes that happen around the time the thread is started may be
missed.</li>
+ * <li>There is a delay between a file changing and the callback firing.</li>
+ * <li>The watch is not recursive - changes to subdirectories will not trigger
a callback.</li>
+ * </ul>
+ * <p/>
+ * This file has been copied from the Apache ZooKeeper project.
+ * @see <a href=
+ *
"https://github.com/apache/zookeeper/blob/8148f966947d3ecf3db0b756d93c9ffa88174af9/zookeeper-server/src/main/java/org/apache/zookeeper/common/FileChangeWatcher.java";>Base
+ * revision</a>
+ */
+@InterfaceAudience.Private
+public final class FileChangeWatcher {
Review Comment:
Is this a straight copy from Zookeeper? Couldn't we just reuse the ZK impl
directly, as we already have ZK as a dependency?
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