2 * Copyright (c) 2015 Cisco Systems, 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.netconf.sal.connect.netconf.sal;
10 import static org.opendaylight.netconf.sal.connect.netconf.util.NetconfBaseOps.getSourceNode;
11 import static org.opendaylight.netconf.sal.connect.netconf.util.NetconfMessageTransformUtil.NETCONF_GET_CONFIG_NODEID;
12 import static org.opendaylight.netconf.sal.connect.netconf.util.NetconfMessageTransformUtil.NETCONF_GET_CONFIG_PATH;
13 import static org.opendaylight.netconf.sal.connect.netconf.util.NetconfMessageTransformUtil.NETCONF_RUNNING_QNAME;
15 import com.google.common.base.Preconditions;
16 import com.google.common.util.concurrent.FluentFuture;
17 import com.google.common.util.concurrent.FutureCallback;
18 import com.google.common.util.concurrent.Futures;
19 import com.google.common.util.concurrent.MoreExecutors;
20 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
21 import java.util.concurrent.ScheduledExecutorService;
22 import java.util.concurrent.ScheduledFuture;
23 import java.util.concurrent.TimeUnit;
24 import java.util.concurrent.atomic.AtomicBoolean;
25 import javax.annotation.Nonnull;
26 import javax.annotation.Nullable;
27 import org.eclipse.jdt.annotation.NonNull;
28 import org.opendaylight.mdsal.dom.api.DOMActionService;
29 import org.opendaylight.mdsal.dom.api.DOMNotification;
30 import org.opendaylight.mdsal.dom.api.DOMRpcAvailabilityListener;
31 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
32 import org.opendaylight.mdsal.dom.api.DOMRpcService;
33 import org.opendaylight.netconf.sal.connect.api.RemoteDeviceHandler;
34 import org.opendaylight.netconf.sal.connect.netconf.listener.NetconfDeviceCommunicator;
35 import org.opendaylight.netconf.sal.connect.netconf.listener.NetconfSessionPreferences;
36 import org.opendaylight.netconf.sal.connect.netconf.util.NetconfMessageTransformUtil;
37 import org.opendaylight.netconf.sal.connect.util.RemoteDeviceId;
38 import org.opendaylight.yangtools.concepts.ListenerRegistration;
39 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
40 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
41 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
42 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
43 import org.slf4j.Logger;
44 import org.slf4j.LoggerFactory;
47 * SalFacade proxy that invokes keepalive RPCs to prevent session shutdown from remote device
48 * and to detect incorrect session drops (netconf session is inactive, but TCP/SSH connection is still present).
49 * The keepalive RPC is a get-config with empty filter.
51 public final class KeepaliveSalFacade implements RemoteDeviceHandler<NetconfSessionPreferences> {
53 private static final Logger LOG = LoggerFactory.getLogger(KeepaliveSalFacade.class);
55 // 2 minutes keepalive delay by default
56 private static final long DEFAULT_DELAY = TimeUnit.MINUTES.toSeconds(2);
58 // 1 minute transaction timeout by default
59 private static final long DEFAULT_TRANSACTION_TIMEOUT_MILLI = TimeUnit.MILLISECONDS.toMillis(60000);
61 private final RemoteDeviceId id;
62 private final RemoteDeviceHandler<NetconfSessionPreferences> salFacade;
63 private final ScheduledExecutorService executor;
64 private final long keepaliveDelaySeconds;
65 private final ResetKeepalive resetKeepaliveTask;
66 private final long defaultRequestTimeoutMillis;
68 private volatile NetconfDeviceCommunicator listener;
69 private volatile ScheduledFuture<?> currentKeepalive;
70 private volatile DOMRpcService currentDeviceRpc;
71 private final AtomicBoolean lastKeepAliveSucceeded = new AtomicBoolean(false);
73 public KeepaliveSalFacade(final RemoteDeviceId id, final RemoteDeviceHandler<NetconfSessionPreferences> salFacade,
74 final ScheduledExecutorService executor, final long keepaliveDelaySeconds,
75 final long defaultRequestTimeoutMillis) {
77 this.salFacade = salFacade;
78 this.executor = executor;
79 this.keepaliveDelaySeconds = keepaliveDelaySeconds;
80 this.defaultRequestTimeoutMillis = defaultRequestTimeoutMillis;
81 this.resetKeepaliveTask = new ResetKeepalive();
84 public KeepaliveSalFacade(final RemoteDeviceId id, final RemoteDeviceHandler<NetconfSessionPreferences> salFacade,
85 final ScheduledExecutorService executor) {
86 this(id, salFacade, executor, DEFAULT_DELAY, DEFAULT_TRANSACTION_TIMEOUT_MILLI);
90 * Set the netconf session listener whenever ready.
92 * @param listener netconf session listener
94 public void setListener(final NetconfDeviceCommunicator listener) {
95 this.listener = listener;
99 * Just cancel current keepalive task.
100 * If its already started, let it finish ... not such a big deal.
103 * Then schedule next keepalive.
105 void resetKeepalive() {
106 LOG.trace("{}: Resetting netconf keepalive timer", id);
107 if (currentKeepalive != null) {
108 currentKeepalive.cancel(false);
110 scheduleKeepalives();
114 * Cancel current keepalive and also reset current deviceRpc.
116 private void stopKeepalives() {
117 if (currentKeepalive != null) {
118 currentKeepalive.cancel(false);
120 currentDeviceRpc = null;
124 Preconditions.checkState(listener != null, "%s: Unable to reconnect, session listener is missing", id);
126 LOG.info("{}: Reconnecting inactive netconf session", id);
127 listener.disconnect();
131 public void onDeviceConnected(final SchemaContext remoteSchemaContext,
132 final NetconfSessionPreferences netconfSessionPreferences, final DOMRpcService deviceRpc) {
133 onDeviceConnected(remoteSchemaContext, netconfSessionPreferences, deviceRpc, null);
137 public void onDeviceConnected(final SchemaContext remoteSchemaContext,
138 final NetconfSessionPreferences netconfSessionPreferences, final DOMRpcService deviceRpc,
139 final DOMActionService deviceAction) {
140 this.currentDeviceRpc = deviceRpc;
141 final DOMRpcService deviceRpc1 =
142 new KeepaliveDOMRpcService(deviceRpc, resetKeepaliveTask, defaultRequestTimeoutMillis, executor,
143 new ResponseWaitingScheduler());
145 salFacade.onDeviceConnected(remoteSchemaContext, netconfSessionPreferences, deviceRpc1, deviceAction);
147 LOG.debug("{}: Netconf session initiated, starting keepalives", id);
148 scheduleKeepalives();
151 private void scheduleKeepalives() {
152 lastKeepAliveSucceeded.set(true);
153 Preconditions.checkState(currentDeviceRpc != null);
154 LOG.trace("{}: Scheduling keepalives every {} {}", id, keepaliveDelaySeconds, TimeUnit.SECONDS);
155 currentKeepalive = executor.scheduleWithFixedDelay(new Keepalive(),
156 keepaliveDelaySeconds, keepaliveDelaySeconds, TimeUnit.SECONDS);
160 public void onDeviceDisconnected() {
162 salFacade.onDeviceDisconnected();
166 public void onDeviceFailed(final Throwable throwable) {
168 salFacade.onDeviceFailed(throwable);
172 public void onNotification(final DOMNotification domNotification) {
174 salFacade.onNotification(domNotification);
178 public void close() {
183 // Keepalive RPC static resources
184 private static final ContainerNode KEEPALIVE_PAYLOAD = NetconfMessageTransformUtil.wrap(NETCONF_GET_CONFIG_NODEID,
185 getSourceNode(NETCONF_RUNNING_QNAME), NetconfMessageTransformUtil.EMPTY_FILTER);
188 * Invoke keepalive RPC and check the response. In case of any received response the keepalive
189 * is considered successful and schedules next keepalive with a fixed delay. If the response is unsuccessful (no
190 * response received, or the rcp could not even be sent) immediate reconnect is triggered as netconf session
191 * is considered inactive/failed.
193 private class Keepalive implements Runnable, FutureCallback<DOMRpcResult> {
197 LOG.trace("{}: Invoking keepalive RPC", id);
200 final boolean lastJobSucceeded = lastKeepAliveSucceeded.getAndSet(false);
201 if (!lastJobSucceeded) {
202 onFailure(new IllegalStateException("Previous keepalive timed out"));
204 Futures.addCallback(currentDeviceRpc.invokeRpc(NETCONF_GET_CONFIG_PATH, KEEPALIVE_PAYLOAD), this,
205 MoreExecutors.directExecutor());
207 } catch (final NullPointerException e) {
208 LOG.debug("{}: Skipping keepalive while reconnecting", id);
209 // Empty catch block intentional
210 // Do nothing. The currentDeviceRpc was null and it means we hit the reconnect window and
211 // attempted to send keepalive while we were reconnecting. Next keepalive will be scheduled
212 // after reconnect so no action necessary here.
216 @SuppressFBWarnings(value = "RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE",
217 justification = "Unrecognised NullableDecl")
219 public void onSuccess(final DOMRpcResult result) {
220 // No matter what response we got, rpc-reply or rpc-error,
221 // we got it from device so the netconf session is OK
222 if (result != null && result.getResult() != null) {
223 lastKeepAliveSucceeded.set(true);
224 } else if (result != null && result.getErrors() != null) {
225 LOG.warn("{}: Keepalive RPC failed with error: {}", id, result.getErrors());
226 lastKeepAliveSucceeded.set(true);
228 LOG.warn("{} Keepalive RPC returned null with response. Reconnecting netconf session", id);
234 public void onFailure(@Nonnull final Throwable throwable) {
235 LOG.warn("{}: Keepalive RPC failed. Reconnecting netconf session.", id, throwable);
241 * Reset keepalive after each RPC response received.
243 private class ResetKeepalive implements FutureCallback<DOMRpcResult> {
245 public void onSuccess(@Nullable final DOMRpcResult result) {
246 // No matter what response we got,
247 // rpc-reply or rpc-error, we got it from device so the netconf session is OK.
252 public void onFailure(@Nonnull final Throwable throwable) {
253 // User/Application RPC failed (The RPC did not reach the remote device or ..
254 // TODO what other reasons could cause this ?)
255 // There is no point in keeping this session. Reconnect.
256 LOG.warn("{}: Rpc failure detected. Reconnecting netconf session", id, throwable);
261 private final class ResponseWaitingScheduler {
263 private ScheduledFuture<?> schedule;
265 public void initScheduler(final Runnable runnable) {
266 if (currentKeepalive != null) {
267 currentKeepalive.cancel(true);
269 LOG.trace("Keepalive does not exist.");
271 scheduleKeepalives();
272 //Listening on the result should be done before the keepalive rpc will be send
273 final long delay = (keepaliveDelaySeconds * 1000) - 500;
274 schedule = executor.schedule(runnable, delay, TimeUnit.MILLISECONDS);
277 public void stopScheduler() {
278 if (schedule != null) {
279 schedule.cancel(true);
281 LOG.trace("Scheduler does not exist.");
286 private static final class ResponseWaiting implements Runnable {
288 private final FluentFuture<DOMRpcResult> rpcResultFuture;
289 private final ResponseWaitingScheduler responseWaitingScheduler;
291 ResponseWaiting(final ResponseWaitingScheduler responseWaitingScheduler,
292 final FluentFuture<DOMRpcResult> rpcResultFuture) {
293 this.responseWaitingScheduler = responseWaitingScheduler;
294 this.rpcResultFuture = rpcResultFuture;
297 public void start() {
298 LOG.trace("Start to waiting for result.");
299 responseWaitingScheduler.initScheduler(this);
303 LOG.info("Stop to waiting for result.");
304 responseWaitingScheduler.stopScheduler();
309 if (!rpcResultFuture.isCancelled() && !rpcResultFuture.isDone()) {
310 LOG.trace("Waiting for result");
311 responseWaitingScheduler.initScheduler(this);
313 LOG.trace("Result has been cancelled or done.");
319 * Request timeout task is called once the defaultRequestTimeoutMillis is
320 * reached. At this moment, if the request is not yet finished, we cancel
323 private static final class RequestTimeoutTask implements Runnable {
325 private final FluentFuture<DOMRpcResult> rpcResultFuture;
326 private final ResponseWaiting responseWaiting;
328 RequestTimeoutTask(final FluentFuture<DOMRpcResult> rpcResultFuture, final ResponseWaiting responseWaiting) {
329 this.rpcResultFuture = rpcResultFuture;
330 this.responseWaiting = responseWaiting;
335 if (!rpcResultFuture.isDone()) {
336 rpcResultFuture.cancel(true);
338 if (responseWaiting != null) {
339 responseWaiting.stop();
345 * DOMRpcService proxy that attaches reset-keepalive-task and schedule
346 * request-timeout-task to each RPC invocation.
348 public static final class KeepaliveDOMRpcService implements DOMRpcService {
350 private final DOMRpcService deviceRpc;
351 private final ResetKeepalive resetKeepaliveTask;
352 private final long defaultRequestTimeoutMillis;
353 private final ScheduledExecutorService executor;
354 private final ResponseWaitingScheduler responseWaitingScheduler;
356 KeepaliveDOMRpcService(final DOMRpcService deviceRpc, final ResetKeepalive resetKeepaliveTask,
357 final long defaultRequestTimeoutMillis, final ScheduledExecutorService executor,
358 final ResponseWaitingScheduler responseWaitingScheduler) {
359 this.deviceRpc = deviceRpc;
360 this.resetKeepaliveTask = resetKeepaliveTask;
361 this.defaultRequestTimeoutMillis = defaultRequestTimeoutMillis;
362 this.executor = executor;
363 this.responseWaitingScheduler = responseWaitingScheduler;
366 public DOMRpcService getDeviceRpc() {
372 public @NonNull FluentFuture<DOMRpcResult> invokeRpc(@Nonnull final SchemaPath type,
373 final NormalizedNode<?, ?> input) {
374 final FluentFuture<DOMRpcResult> rpcResultFuture = deviceRpc.invokeRpc(type, input);
375 final ResponseWaiting responseWaiting = new ResponseWaiting(responseWaitingScheduler, rpcResultFuture);
376 responseWaiting.start();
377 rpcResultFuture.addCallback(resetKeepaliveTask, MoreExecutors.directExecutor());
379 final RequestTimeoutTask timeoutTask = new RequestTimeoutTask(rpcResultFuture, responseWaiting);
380 executor.schedule(timeoutTask, defaultRequestTimeoutMillis, TimeUnit.MILLISECONDS);
382 return rpcResultFuture;
386 public <T extends DOMRpcAvailabilityListener> ListenerRegistration<T> registerRpcListener(
387 @Nonnull final T listener) {
388 // There is no real communication with the device (yet), no reset here
389 return deviceRpc.registerRpcListener(listener);