2 * Copyright (c) 2016 Red Hat, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.mdsal.trace.impl;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.collect.ClassToInstanceMap;
13 import com.google.common.collect.MutableClassToInstanceMap;
14 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
15 import java.io.PrintStream;
16 import java.util.ArrayList;
17 import java.util.List;
19 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
20 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
21 import org.opendaylight.mdsal.dom.api.ClusteredDOMDataTreeChangeListener;
22 import org.opendaylight.mdsal.dom.api.DOMDataBroker;
23 import org.opendaylight.mdsal.dom.api.DOMDataBrokerExtension;
24 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
25 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeService;
26 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
27 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadTransaction;
28 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadWriteTransaction;
29 import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteTransaction;
30 import org.opendaylight.mdsal.dom.api.DOMTransactionChain;
31 import org.opendaylight.mdsal.dom.api.DOMTransactionChainListener;
32 import org.opendaylight.mdsal.trace.api.TracingDOMDataBroker;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.mdsaltrace.rev160908.Config;
34 import org.opendaylight.yangtools.concepts.ListenerRegistration;
35 import org.opendaylight.yangtools.yang.binding.DataObject;
36 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
41 @SuppressWarnings("checkstyle:JavadocStyle")
42 //...because otherwise it whines about the elements in the @code block even though it's completely valid Javadoc
45 * TracingBroker logs "write" operations and listener registrations to the md-sal. It logs the instance identifier path,
46 * the objects themselves, as well as the stack trace of the call invoking the registration or write operation.
47 * It works by operating as a "bump on the stack" between the application and actual DataBroker, intercepting write
48 * and registration calls and writing to the log.
50 * <p>In addition, it (optionally) can also keep track of the stack trace of all new transaction allocations
51 * (including TransactionChains, and transactions created in turn from them), in order to detect and report leaks
52 * from transactions which were not closed.
55 * TracingBroker is designed to be easy to use. In fact, for bundles using Blueprint to inject their DataBroker
56 * TracingBroker can be used without modifying your code at all in two simple steps:
59 * Simply add the dependency "mdsaltrace-features" to
64 * <groupId>org.opendaylight.controller</groupId>
65 * <artifactId>features-mdsal-trace</artifactId>
66 * <version>1.7.0-SNAPSHOT</version>
67 * <classifier>features</classifier>
69 * <scope>runtime</scope>
75 * Then just "feature:install odl-mdsal-trace" before you install your "real" feature(s) and you're done.
76 * Beware that with Karaf 4 due to <a href="https://bugs.opendaylight.org/show_bug.cgi?id=9068">Bug 9068</a>
77 * you'll probably have to use feature:install's --no-auto-refresh flag when installing your "real" feature.
80 * This works because the mdsaltrace-impl bundle registers its service implementing DOMDataBroker with a higher
81 * rank than sal-binding-broker. As such, any OSGi service lookup for DataBroker will receive the TracingBroker.
83 * <h1>Avoiding log bloat:</h1>
84 * TracingBroker can be configured to only print registrations or write ops pertaining to certain subtrees of the
85 * md-sal. This can be done in the code via the methods of this class or via a config file. TracingBroker uses a more
86 * convenient but non-standard representation of the instance identifiers. Each instance identifier segment's
87 * class.getSimpleName() is used separated by a '/'.
89 * <h1>Known issues</h1>
92 * Filtering by paths. For some registrations the codec that converts back from the DOM to binding paths is
93 * busted. As such, an aproximated path is used in the output. For now it is recommended not to use
94 * watchRegistrations and allow all registrations to be logged.
99 public class TracingBroker implements TracingDOMDataBroker {
100 @SuppressFBWarnings("SLF4J_LOGGER_SHOULD_BE_PRIVATE")
101 static final Logger LOG = LoggerFactory.getLogger(TracingBroker.class);
103 private static final int STACK_TRACE_FIRST_RELEVANT_FRAME = 2;
105 private final BindingCodecTree codec;
106 private final DOMDataBroker delegate;
107 private final List<Watch> registrationWatches = new ArrayList<>();
108 private final List<Watch> writeWatches = new ArrayList<>();
110 private final boolean isDebugging;
111 private final CloseTrackedRegistry<TracingTransactionChain> transactionChainsRegistry;
112 private final CloseTrackedRegistry<TracingReadOnlyTransaction> readOnlyTransactionsRegistry;
113 private final CloseTrackedRegistry<TracingWriteTransaction> writeTransactionsRegistry;
114 private final CloseTrackedRegistry<TracingReadWriteTransaction> readWriteTransactionsRegistry;
116 private class Watch {
117 final String iidString;
118 final LogicalDatastoreType store;
120 Watch(final String iidString, final LogicalDatastoreType storeOrNull) {
121 this.store = storeOrNull;
122 this.iidString = iidString;
125 private String toIidCompString(final YangInstanceIdentifier iid) {
126 StringBuilder builder = new StringBuilder();
127 toPathString(iid, builder);
128 return builder.append('/').toString();
131 private boolean isParent(final String parent, final String child) {
132 int parentOffset = 0;
133 if (parent.length() > 0 && parent.charAt(0) == '<') {
134 parentOffset = parent.indexOf('>') + 1;
138 if (child.length() > 0 && child.charAt(0) == '<') {
139 childOffset = child.indexOf('>') + 1;
142 return child.startsWith(parent.substring(parentOffset), childOffset);
145 @SuppressWarnings({ "checkstyle:hiddenField", "hiding" })
146 public boolean subtreesOverlap(final YangInstanceIdentifier iid, final LogicalDatastoreType store) {
147 if (this.store != null && !this.store.equals(store)) {
151 String otherIidString = toIidCompString(iid);
152 return isParent(iidString, otherIidString) || isParent(otherIidString, iidString);
155 @SuppressWarnings({ "checkstyle:hiddenField", "hiding" })
156 public boolean eventIsOfInterest(final YangInstanceIdentifier iid, final LogicalDatastoreType store) {
157 if (this.store != null && !this.store.equals(store)) {
161 return isParent(iidString, toPathString(iid));
165 public TracingBroker(final DOMDataBroker delegate, final Config config, final BindingCodecTree codec) {
166 this.delegate = requireNonNull(delegate, "delegate");
167 this.codec = requireNonNull(codec, "codec");
170 this.isDebugging = Boolean.TRUE.equals(config.getTransactionDebugContextEnabled());
171 final String db = "DataBroker";
172 this.transactionChainsRegistry = new CloseTrackedRegistry<>(db, "createTransactionChain()", isDebugging);
173 this.readOnlyTransactionsRegistry = new CloseTrackedRegistry<>(db, "newReadOnlyTransaction()", isDebugging);
174 this.writeTransactionsRegistry = new CloseTrackedRegistry<>(db, "newWriteOnlyTransaction()", isDebugging);
175 this.readWriteTransactionsRegistry = new CloseTrackedRegistry<>(db, "newReadWriteTransaction()", isDebugging);
178 private void configure(final Config config) {
179 registrationWatches.clear();
180 Set<String> paths = config.getRegistrationWatches();
182 for (String path : paths) {
183 watchRegistrations(path, null);
187 writeWatches.clear();
188 paths = config.getWriteWatches();
190 for (String path : paths) {
191 watchWrites(path, null);
197 * Log registrations to this subtree of the md-sal.
198 * @param iidString the iid path of the root of the subtree
199 * @param store Which LogicalDataStore? or null for both
201 public void watchRegistrations(final String iidString, final LogicalDatastoreType store) {
202 LOG.info("Watching registrations to {} in {}", iidString, store);
203 registrationWatches.add(new Watch(iidString, store));
207 * Log writes to this subtree of the md-sal.
208 * @param iidString the iid path of the root of the subtree
209 * @param store Which LogicalDataStore? or null for both
211 public void watchWrites(final String iidString, final LogicalDatastoreType store) {
212 LOG.info("Watching writes to {} in {}", iidString, store);
213 Watch watch = new Watch(iidString, store);
214 writeWatches.add(watch);
217 private boolean isRegistrationWatched(final YangInstanceIdentifier iid, final LogicalDatastoreType store) {
218 if (registrationWatches.isEmpty()) {
222 for (Watch regInterest : registrationWatches) {
223 if (regInterest.subtreesOverlap(iid, store)) {
231 boolean isWriteWatched(final YangInstanceIdentifier iid, final LogicalDatastoreType store) {
232 if (writeWatches.isEmpty()) {
236 for (Watch watch : writeWatches) {
237 if (watch.eventIsOfInterest(iid, store)) {
245 static void toPathString(final InstanceIdentifier<? extends DataObject> iid, final StringBuilder builder) {
246 for (InstanceIdentifier.PathArgument pathArg : iid.getPathArguments()) {
247 builder.append('/').append(pathArg.getType().getSimpleName());
251 String toPathString(final YangInstanceIdentifier yiid) {
252 StringBuilder sb = new StringBuilder();
253 toPathString(yiid, sb);
254 return sb.toString();
258 private void toPathString(final YangInstanceIdentifier yiid, final StringBuilder sb) {
259 InstanceIdentifier<?> iid = codec.getInstanceIdentifierCodec().toBinding(yiid);
261 reconstructIidPathString(yiid, sb);
263 toPathString(iid, sb);
267 private static void reconstructIidPathString(final YangInstanceIdentifier yiid, final StringBuilder sb) {
268 sb.append("<RECONSTRUCTED FROM: \"").append(yiid.toString()).append("\">");
269 for (YangInstanceIdentifier.PathArgument pathArg : yiid.getPathArguments()) {
270 if (pathArg instanceof YangInstanceIdentifier.AugmentationIdentifier) {
271 sb.append('/').append("AUGMENTATION");
274 sb.append('/').append(pathArg.getNodeType().getLocalName());
278 String getStackSummary() {
279 StackTraceElement[] stack = Thread.currentThread().getStackTrace();
281 StringBuilder sb = new StringBuilder();
282 for (int i = STACK_TRACE_FIRST_RELEVANT_FRAME; i < stack.length; i++) {
283 StackTraceElement frame = stack[i];
284 sb.append("\n\t(TracingBroker)\t").append(frame.getClassName()).append('.').append(frame.getMethodName());
287 return sb.toString();
291 public DOMDataTreeReadWriteTransaction newReadWriteTransaction() {
292 return new TracingReadWriteTransaction(delegate.newReadWriteTransaction(), this, readWriteTransactionsRegistry);
296 public DOMDataTreeWriteTransaction newWriteOnlyTransaction() {
297 return new TracingWriteTransaction(delegate.newWriteOnlyTransaction(), this, writeTransactionsRegistry);
301 public DOMTransactionChain createTransactionChain(final DOMTransactionChainListener transactionChainListener) {
302 return new TracingTransactionChain(delegate.createTransactionChain(transactionChainListener), this,
303 transactionChainsRegistry);
307 public DOMTransactionChain createMergingTransactionChain(
308 final DOMTransactionChainListener transactionChainListener) {
309 return new TracingTransactionChain(delegate.createMergingTransactionChain(transactionChainListener), this,
310 transactionChainsRegistry);
314 public DOMDataTreeReadTransaction newReadOnlyTransaction() {
315 return new TracingReadOnlyTransaction(delegate.newReadOnlyTransaction(), readOnlyTransactionsRegistry);
319 public ClassToInstanceMap<DOMDataBrokerExtension> getExtensions() {
320 final ClassToInstanceMap<DOMDataBrokerExtension> delegateExt = delegate.getExtensions();
321 final DOMDataTreeChangeService treeChangeSvc = delegateExt.getInstance(DOMDataTreeChangeService.class);
322 if (treeChangeSvc == null) {
326 final ClassToInstanceMap<DOMDataBrokerExtension> res = MutableClassToInstanceMap.create(delegateExt);
327 res.put(DOMDataTreeChangeService.class, new DOMDataTreeChangeService() {
329 public <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerDataTreeChangeListener(
330 final DOMDataTreeIdentifier domDataTreeIdentifier, final L listener) {
331 if (isRegistrationWatched(domDataTreeIdentifier.getRootIdentifier(),
332 domDataTreeIdentifier.getDatastoreType())) {
333 LOG.warn("{} registration (registerDataTreeChangeListener) for {} from {}.",
334 listener instanceof ClusteredDOMDataTreeChangeListener ? "Clustered" : "Non-clustered",
335 toPathString(domDataTreeIdentifier.getRootIdentifier()), getStackSummary());
337 return treeChangeSvc.registerDataTreeChangeListener(domDataTreeIdentifier, listener);
345 public boolean printOpenTransactions(final PrintStream ps, final int minOpenTXs) {
346 if (transactionChainsRegistry.getAllUnique().isEmpty()
347 && readOnlyTransactionsRegistry.getAllUnique().isEmpty()
348 && writeTransactionsRegistry.getAllUnique().isEmpty()
349 && readWriteTransactionsRegistry.getAllUnique().isEmpty()) {
351 ps.println("No open transactions, great!");
355 ps.println(getClass().getSimpleName() + " found some not yet (or never..) closed transaction[chain]s!");
356 ps.println("[NB: If no stack traces are shown below, then "
357 + "enable transaction-debug-context-enabled in mdsaltrace_config.xml]");
359 // Flag to track if we really found any real leaks with more (or equal) to minOpenTXs
360 boolean hasFound = print(readOnlyTransactionsRegistry, ps, " ", minOpenTXs);
361 hasFound |= print(writeTransactionsRegistry, ps, " ", minOpenTXs);
362 hasFound |= print(readWriteTransactionsRegistry, ps, " ", minOpenTXs);
364 // Now print details for each non-closed TransactionChain
365 // incl. in turn each ones own read/Write[Only]TransactionsRegistry
366 Set<CloseTrackedRegistryReportEntry<TracingTransactionChain>>
367 entries = transactionChainsRegistry.getAllUnique();
368 if (!entries.isEmpty()) {
369 ps.println(" " + transactionChainsRegistry.getAnchor() + " : "
370 + transactionChainsRegistry.getCreateDescription());
372 for (CloseTrackedRegistryReportEntry<TracingTransactionChain> entry : entries) {
373 ps.println(" " + entry.getNumberAddedNotRemoved() + "x TransactionChains opened but not closed here:");
374 printStackTraceElements(ps, " ", entry.getStackTraceElements());
375 @SuppressWarnings("resource")
376 TracingTransactionChain txChain = (TracingTransactionChain) entry
377 .getExampleCloseTracked().getRealCloseTracked();
378 hasFound |= print(txChain.getReadOnlyTransactionsRegistry(), ps, " ", minOpenTXs);
379 hasFound |= print(txChain.getWriteTransactionsRegistry(), ps, " ", minOpenTXs);
380 hasFound |= print(txChain.getReadWriteTransactionsRegistry(), ps, " ", minOpenTXs);
387 private <T extends CloseTracked<T>> boolean print(final CloseTrackedRegistry<T> registry, final PrintStream ps,
388 final String indent, final int minOpenTransactions) {
389 Set<CloseTrackedRegistryReportEntry<T>> unsorted = registry.getAllUnique();
390 if (unsorted.size() < minOpenTransactions) {
394 List<CloseTrackedRegistryReportEntry<T>> entries = new ArrayList<>(unsorted);
395 entries.sort((o1, o2) -> Long.compare(o2.getNumberAddedNotRemoved(), o1.getNumberAddedNotRemoved()));
397 if (!entries.isEmpty()) {
398 ps.println(indent + registry.getAnchor() + " : " + registry.getCreateDescription());
400 entries.forEach(entry -> {
401 ps.println(indent + " " + entry.getNumberAddedNotRemoved()
402 + "x transactions opened here, which are not closed:");
403 printStackTraceElements(ps, indent + " ", entry.getStackTraceElements());
405 if (!entries.isEmpty()) {
411 private void printStackTraceElements(final PrintStream ps, final String indent,
412 final List<StackTraceElement> stackTraceElements) {
413 boolean ellipsis = false;
414 for (final StackTraceElement stackTraceElement : stackTraceElements) {
415 if (isStackTraceElementInteresting(stackTraceElement)) {
416 ps.println(indent + stackTraceElement);
418 } else if (!ellipsis) {
419 ps.println(indent + "(...)");
425 private boolean isStackTraceElementInteresting(final StackTraceElement element) {
426 final String className = element.getClassName();
427 return !className.startsWith(getClass().getPackage().getName())
428 && !className.startsWith(CloseTracked.class.getPackage().getName())
429 && !className.startsWith("Proxy")
430 && !className.startsWith("akka")
431 && !className.startsWith("scala")
432 && !className.startsWith("sun.reflect")
433 && !className.startsWith("java.lang.reflect")
434 && !className.startsWith("org.apache.aries.blueprint")
435 && !className.startsWith("org.osgi.util.tracker");