/*
* Copyright 2008 Google Inc.
*
* 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.google.jstestdriver;
import static com.google.jstestdriver.runner.RunnerType.BROWSER;
import static com.google.jstestdriver.runner.RunnerType.CLIENT;
import static com.google.jstestdriver.runner.RunnerType.STANDALONE;
import static com.google.jstestdriver.server.handlers.CaptureHandler.RUNNER_TYPE;
import static java.lang.String.format;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import org.joda.time.Instant;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Objects;
import com.google.jstestdriver.Response.ResponseType;
import com.google.jstestdriver.commands.NoopCommand;
import com.google.jstestdriver.model.HandlerPathPrefix;
import com.google.jstestdriver.runner.RunnerType;
import com.google.jstestdriver.server.handlers.pages.PageType;
import com.google.jstestdriver.server.handlers.pages.SlavePageRequest;
/**
* Represents a captured browser, and brokers the interaction between the client
* and browser.
*
* @author jeremiele@google.com (Jeremie Lenfant-Engelmann)
*/
public class SlaveBrowser {
public static enum BrowserState {
CAPTURED, READY, HEARTBEAT, DEAD
}
private static final String CLIENT_CONSOLE_RUNNER = "/slave/id/%s/page/CONSOLE/mode/%s/"
+ SlavePageRequest.TIMEOUT + "/%s/"
+ SlavePageRequest.UPLOAD_SIZE + "/%s/"
+ RUNNER_TYPE + "/" + CLIENT;
private static final String STANDALONE_CONSOLE_RUNNER = "/runner/id/%s/page/RUNNER/mode/%s/"
+ SlavePageRequest.TIMEOUT + "/%s/"
+ SlavePageRequest.UPLOAD_SIZE + "/%s/"
+ RUNNER_TYPE + "/" + STANDALONE;
private static final String BROWSER_CONTROLLED_RUNNER = "/bcr/id/%s/page/" + PageType.VISUAL_STANDALONE_RUNNER + "/mode/%s/"
+ SlavePageRequest.TIMEOUT + "/%s/"
+ SlavePageRequest.UPLOAD_SIZE + "/%s/"
+ RUNNER_TYPE + "/" + BROWSER;
private static final Logger LOGGER = LoggerFactory.getLogger(SlaveBrowser.class);
public static final long TIMEOUT = 30000; // 30 seconds
public static final long SESSION_TIMEOUT = 2000;
private static final int POLL_RESPONSE_TIMEOUT = 2;
private final Time time;
private final String id;
private final BrowserInfo browserInfo;
private final BlockingQueue<Command> commandsToRun = new LinkedBlockingQueue<Command>();
private long dequeueTimeout = 10;
private TimeUnit timeUnit = TimeUnit.SECONDS;
private AtomicReference<Instant> lastHeartbeat;
private Set<FileInfo> fileSet = new LinkedHashSet<FileInfo>();
private final BlockingQueue<StreamMessage> responses = new LinkedBlockingQueue<StreamMessage>();
private AtomicReference<Command> commandRunning = new AtomicReference<Command>(null);
private AtomicReference<Command> lastCommandDequeued = new AtomicReference<Command>(null);
private final long timeout;
private final Lock lock = new Lock();
private final HandlerPathPrefix prefix;
private final String mode;
private final RunnerType type;
private AtomicReference<BrowserState> state;
private ConcurrentMap<FileResult, Boolean> fileResults = new ConcurrentHashMap<FileResult, Boolean>();
public SlaveBrowser(Time time, String id, BrowserInfo browserInfo, long timeout,
HandlerPathPrefix prefix, String mode, RunnerType type, BrowserState state, Instant lastHeartbeat) {
this.time = time;
this.timeout = timeout;
this.id = id;
this.browserInfo = browserInfo;
this.prefix = prefix;
this.mode = mode;
this.type = type;
this.state = new AtomicReference<BrowserState>(state);
this.lastHeartbeat = new AtomicReference<Instant>(lastHeartbeat);
}
public String getId() {
return id;
}
public boolean tryLock(String sessionId) {
boolean success = lock.tryLock(sessionId);
if (success) {
heartBeatLock(sessionId);
}
return success;
}
public void unlock(String sessionId) {
lock.unlock(sessionId);
}
public void forceUnlock() {
lock.forceUnlock();
}
public boolean isLocked() {
return lock.isLocked();
}
public void heartBeatLock(String sessionId) {
if (Objects.equal(lock.getSessionId(), sessionId)) {
lock.setLastHeartBeat(time.now().getMillis());
} else {
LOGGER.error("Session heartbeat {} without a session on {}", sessionId, browserInfo);
}
}
public void createCommand(String data) {
try {
commandsToRun.put(new Command(data));
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
public Command dequeueCommand() {
try {
Command command = commandsToRun.poll(dequeueTimeout, timeUnit);
LOGGER.trace("dequeue {}", command);
synchronized (this) {
if (command != null) {
commandRunning.set(command);
lastCommandDequeued.set(command);
return command;
}
}
} catch (InterruptedException e) {
// The server was killed
}
return new NoopCommand();
}
public Command getLastDequeuedCommand() {
return lastCommandDequeued.get();
}
public BrowserInfo getBrowserInfo() {
return browserInfo;
}
public void setDequeueTimeout(long dequeueTimeout, TimeUnit timeUnit) {
this.dequeueTimeout = dequeueTimeout;
this.timeUnit = timeUnit;
}
public synchronized void heartBeat() {
lastHeartbeat.set(time.now());
state.set(BrowserState.HEARTBEAT);
browserInfo.setServerReceivedHeartbeat(true);
}
public Instant getLastHeartbeat() {
return lastHeartbeat.get();
}
/** @return true if at least one heartbeat was received from the browser. */
public boolean receivedHeartbeat() {
return !BrowserState.CAPTURED.equals(state.get());
}
/** Changes the BrowserState to ready */
public synchronized void ready() {
state.set(BrowserState.READY);
browserInfo.setReady(true);
}
/**
* @return the number of seconds since the last heartbeat, or -1 if no
* heartbeat has been received.
*/
public double getSecondsSinceLastHeartbeat() {
return (time.now().getMillis() - lastHeartbeat.get().getMillis()) / 1000.0;
}
public synchronized void addFiles(Collection<FileInfo> fileSet, LoadedFiles loadedFiles) {
this.fileSet.removeAll(fileSet);
this.fileSet.addAll(fileSet);
}
public Set<FileInfo> getFileSet() {
return fileSet;
}
public void resetFileSet() {
LOGGER.debug("Resetting fileSet for {}", this);
synchronized (this) {
fileSet.clear();
fileResults.clear();
}
}
public StreamMessage getResponse() {
try {
StreamMessage message = responses.poll(POLL_RESPONSE_TIMEOUT, TimeUnit.SECONDS);
if (message == null) {
LOGGER.trace("responses size {}", responses.size());
message = new StreamMessage(false, new Response(ResponseType.UNKNOWN.name(), "{}", browserInfo, "", 0l));
} else {
LOGGER.trace("returning type {}", message.getResponse().getResponseType());
}
return message;
} catch (InterruptedException e) {
LOGGER.error("Exception during poll {}", e);
return new StreamMessage(false, new Response(ResponseType.UNKNOWN.name(), "{}", browserInfo, "", 0l));
}
}
public void addResponse(Response response, boolean isLast) {
if (isLast) {
commandRunning.set(null);
}
LOGGER.debug("adding response type {} done: {}", response.getResponseType(), isLast);
responses.offer(new StreamMessage(isLast, response));
}
public void clearResponseQueue() {
responses.clear();
}
public boolean isCommandRunning() {
return commandRunning.get() != null;
}
public Command getCommandRunning() {
return commandRunning.get();
}
public Command peekCommand() {
return commandsToRun.peek();
}
public void clearCommandRunning() {
if (commandRunning != null) {
commandRunning.set(null);
commandsToRun.clear();
responses.clear();
}
}
public boolean isAlive() {
boolean alive = (time.now().getMillis() - lastHeartbeat.get().getMillis() < timeout) || timeout == -1;
if (!alive) {
state.set(BrowserState.DEAD);
LOGGER.debug("Browser dead: {}", toString());
}
return alive;
}
public String getCaptureUrl() {
// TODO(corysmith): refactor the capture path building to a proper builder. Doing it to many places.
switch (type) {
case CLIENT:
return prefix.prefixPath(String.format(CLIENT_CONSOLE_RUNNER, id, mode, timeout, browserInfo.getUploadSize()));
case STANDALONE:
return prefix.prefixPath(String.format(STANDALONE_CONSOLE_RUNNER, id, mode, timeout, browserInfo.getUploadSize()));
case BROWSER:
return prefix.prefixPath(String.format(BROWSER_CONTROLLED_RUNNER, id, mode, timeout, browserInfo.getUploadSize()));
}
throw new UnsupportedOperationException("Unsupported Runner type: " + type);
}
@Override
public String toString() {
return format("SlaveBrowser(browserInfo=%s,\n\tid=%s,\n\tsinceLastCheck=%ss,\n\ttimeout=%s)",
browserInfo, id, getSecondsSinceLastHeartbeat(), timeout);
}
/**
* Indicates if the Browser is being used, or has been used recently.
*/
public boolean inUse() {
// Has it been too long since the last session?
if (time.now().getMillis() - lock.getLastHeartBeat() > SESSION_TIMEOUT) {
return false;
}
return true;
}
/**
* Clears all running commands and any queued commands.
*/
public synchronized void resetCommandQueue() {
LOGGER.debug("resetCommandQueue: queued[{}]\n running:[{}]", commandsToRun, commandRunning);
clearCommandRunning();
commandsToRun.clear();
}
/**
* @param allLoadedFiles
*/
public void addFileResults(Collection<FileResult> allLoadedFiles) {
for (FileResult fileResult : allLoadedFiles) {
FileSource fileSource = fileResult.getFileSource();
fileSet.add(fileSource.toFileInfo(null));
fileResults.put(fileResult, true);
}
}
/**
* Checks to see if any of the files loaded contain errors.
*/
public boolean hasFileLoadErrors() {
for (FileResult result : fileResults.keySet()) {
if (!result.isSuccess()) {
return true;
}
}
return false;
}
public RunnerType getRunnerType() {
return type;
}
public String viewResponses() {
return responses.toString();
}
}