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/*
* Copyright 2006 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.gwt.dev.shell;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.TreeLogger.HelpInfo;
import com.google.gwt.dev.About;
import com.google.gwt.dev.GwtVersion;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.prefs.Preferences;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
/**
* Orchestrates a best-effort attempt to find out if a new version of GWT is
* available.
*/
public final class CheckForUpdates {
/**
* Returns the result of an update check.
*/
public interface UpdateResult {
/**
* @return the new version of GWT available.
*/
GwtVersion getNewVersion();
/**
* @return the URL for details about the new version.
*/
URL getURL();
}
public static final long ONE_DAY = 24 * 60 * 60 * 1000;
public static final long ONE_MINUTE = 60 * 1000;
// System properties used by CheckForUpdates
protected static final String PROPERTY_DEBUG_HTTP_GET = "gwt.debugLowLevelHttpGet";
protected static final String PROPERTY_PREFS_NAME = "gwt.prefsPathName";
protected static final String PROPERTY_QUERY_URL = "gwt.forceVersionCheckURL";
// Log levels -- in general we want the logging of the update process
// to not be visible to normal users.
private static final TreeLogger.Type CHECK_ERROR = TreeLogger.DEBUG;
private static final TreeLogger.Type CHECK_INFO = TreeLogger.SPAM;
private static final TreeLogger.Type CHECK_SPAM = TreeLogger.SPAM;
private static final TreeLogger.Type CHECK_WARN = TreeLogger.SPAM;
// Preferences keys
private static final String FIRST_LAUNCH = "firstLaunch";
private static final String HIGHEST_RUN_VERSION = "highestRunVersion";
private static final String LAST_PING = "lastPing";
private static final String NEXT_PING = "nextPing";
// Uncomment one of constants below to try different variations of failure to
// make sure we never interfere with the app running.
// Check against a fake server to see failure to contact server.
// protected static final String QUERY_URL =
// "http://nonexistenthost:1111/gwt/currentversion.xml";
// Check 404 on a real location that doesn't have the file.
// protected static final String QUERY_URL =
// "http://www.google.com/gwt/currentversion.xml";
// A test URL for seeing it actually work in a sandbox.
// protected static final String QUERY_URL =
// "http://localhost/gwt/currentversion.xml";
// The real URL that should be used.
private static final String QUERY_URL = "http://tools.google.com/webtoolkit/currentversion.xml";
public static FutureTask checkForUpdatesInBackgroundThread(
final TreeLogger logger, final long minCheckMillis) {
final String entryPoint = computeEntryPoint();
FutureTask task = new FutureTask(
new Callable() {
@Override
public UpdateResult call() throws Exception {
final CheckForUpdates updateChecker = createUpdateChecker(logger,
entryPoint);
return updateChecker == null ? null
: updateChecker.check(minCheckMillis);
}
});
Thread checkerThread = new Thread(task, "GWT Update Checker");
checkerThread.setDaemon(true);
checkerThread.start();
return task;
}
/**
* Find the first method named "main" on the call stack and use its class as
* the entry point.
*/
public static String computeEntryPoint() {
Throwable t = new Throwable();
for (StackTraceElement stackTrace : t.getStackTrace()) {
if (stackTrace.getMethodName().equals("main")) {
// Strip package name from main's class
String className = stackTrace.getClassName();
int i = className.lastIndexOf('.');
if (i >= 0) {
return className.substring(i + 1);
}
return className;
}
}
return null;
}
public static CheckForUpdates createUpdateChecker(TreeLogger logger) {
return createUpdateChecker(logger, computeEntryPoint());
}
public static CheckForUpdates createUpdateChecker(TreeLogger logger,
String entryPoint) {
return new CheckForUpdates(logger, entryPoint);
}
public static void logUpdateAvailable(TreeLogger logger,
FutureTask updater) {
if (updater != null && updater.isDone()) {
UpdateResult result = null;
try {
result = updater.get(0, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
// Silently ignore exception
} catch (ExecutionException e) {
// Silently ignore exception
} catch (TimeoutException e) {
// Silently ignore exception
}
logUpdateAvailable(logger, result);
}
}
public static void logUpdateAvailable(TreeLogger logger,
UpdateResult result) {
if (result != null) {
final URL url = result.getURL();
logger.log(TreeLogger.WARN, "A new version of GWT ("
+ result.getNewVersion() + ") is available", null, new HelpInfo() {
@Override
public String getAnchorText() {
return "Release Notes";
}
@Override
public URL getURL() {
return url;
}
});
}
}
private static String getTextOfLastElementHavingTag(Document doc,
String tagName) {
NodeList nodeList = doc.getElementsByTagName(tagName);
int n = nodeList.getLength();
if (n > 0) {
Element elem = (Element) nodeList.item(n - 1);
// Assume the first child is the value.
//
Node firstChild = elem.getFirstChild();
if (firstChild != null) {
String text = firstChild.getNodeValue();
return text;
}
}
return null;
}
private String entryPoint;
private TreeLogger logger;
private GwtVersion myVersion;
/**
* Create an update checker which will poll a server URL and log a message
* about an update if available.
*
* @param logger TreeLogger to use
* @param entryPoint the name of the main entry point used for this execution
*/
public CheckForUpdates(TreeLogger logger, String entryPoint) {
this.logger = logger;
this.entryPoint = entryPoint;
myVersion = About.getGwtVersionObject();
}
/**
* Check for updates and log to the logger if they are available.
*
* @return an UpdateResult or null if there is no new update
*/
public UpdateResult check(long minCheckMillis) {
TreeLogger branch = logger.branch(CHECK_INFO, "Checking for updates");
try {
String prefsName = System.getProperty(PROPERTY_PREFS_NAME);
Preferences prefs;
if (prefsName != null) {
prefs = Preferences.userRoot().node(prefsName);
} else {
prefs = Preferences.userNodeForPackage(CheckForUpdates.class);
}
String queryURL = QUERY_URL;
String forceCheckURL = System.getProperty(PROPERTY_QUERY_URL);
if (forceCheckURL != null) {
branch.log(CHECK_INFO, "Explicit version check URL: " + forceCheckURL);
queryURL = forceCheckURL;
}
// Get our unique user id (based on absolute timestamp).
//
long currentTimeMillis = System.currentTimeMillis();
String firstLaunch = prefs.get(FIRST_LAUNCH, null);
if (firstLaunch == null) {
firstLaunch = Long.toHexString(currentTimeMillis);
prefs.put(FIRST_LAUNCH, firstLaunch);
branch.log(CHECK_SPAM, "Setting first launch to " + firstLaunch);
} else {
branch.log(CHECK_SPAM, "First launch was " + firstLaunch);
}
// See if enough time has passed.
//
String lastPing = prefs.get(LAST_PING, "0");
if (lastPing != null) {
try {
long lastPingTime = Long.parseLong(lastPing);
if (currentTimeMillis < lastPingTime + minCheckMillis) {
// it's not time yet
branch.log(CHECK_INFO, "Last ping was " + new Date(lastPingTime)
+ ", min wait is " + minCheckMillis + "ms");
return null;
}
} catch (NumberFormatException e) {
branch.log(CHECK_WARN, "Error parsing last ping time", e);
}
}
// See if it's time for our next ping yet.
//
String nextPing = prefs.get(NEXT_PING, "0");
if (nextPing != null) {
try {
long nextPingTime = Long.parseLong(nextPing);
if (currentTimeMillis < nextPingTime) {
// it's not time yet
branch.log(CHECK_INFO, "Next ping is not until "
+ new Date(nextPingTime));
return null;
}
} catch (NumberFormatException e) {
branch.log(CHECK_WARN, "Error parsing next ping time", e);
}
}
// See if new version is available.
//
String url = queryURL + "?v=" + myVersion.toString() + "&id="
+ firstLaunch + "&r=" + About.getGwtGitRev();
if (entryPoint != null) {
url += "&e=" + entryPoint;
}
branch.log(CHECK_INFO, "Checking for new version at " + url);
// Do the HTTP GET.
//
String fullUserAgent = makeUserAgent();
byte[] response = doHttpGet(branch, fullUserAgent, url);
if (response == null || response.length == 0) {
// Problem. Quietly fail.
//
branch.log(CHECK_ERROR,
"Failed to obtain current version info via HTTP");
return null;
}
// Parse and process the response.
// Bad responses will be silently ignored.
//
return parseResponse(branch, prefs, response);
} catch (Throwable e) {
// Always silently ignore any errors.
//
branch.log(CHECK_INFO, "Exception while processing version info", e);
}
return null;
}
private byte[] doHttpGet(TreeLogger branch, String userAgent, String url) {
Throwable caught;
InputStream is = null;
try {
URL urlToGet = new URL(url);
URLConnection conn = urlToGet.openConnection();
conn.setRequestProperty("User-Agent", userAgent);
is = conn.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = is.read(buffer)) != -1) {
baos.write(buffer, 0, bytesRead);
}
byte[] response = baos.toByteArray();
return response;
} catch (MalformedURLException e) {
caught = e;
} catch (IOException e) {
caught = e;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
if (System.getProperty(PROPERTY_DEBUG_HTTP_GET) != null) {
branch.log(CHECK_ERROR, "Exception in HTTP request", caught);
}
return null;
}
private void appendUserAgentProperty(StringBuffer sb, String propName) {
String propValue = System.getProperty(propName);
if (propValue != null) {
if (sb.length() > 0) {
sb.append("; ");
}
sb.append(propName);
sb.append("=");
sb.append(propValue);
}
}
/**
* Creates a user-agent string by combining standard Java properties.
*/
private String makeUserAgent() {
String ua = "GWT Freshness Checker";
StringBuffer extra = new StringBuffer();
appendUserAgentProperty(extra, "java.vendor");
appendUserAgentProperty(extra, "java.version");
appendUserAgentProperty(extra, "os.arch");
appendUserAgentProperty(extra, "os.name");
appendUserAgentProperty(extra, "os.version");
if (extra.length() > 0) {
ua += " (" + extra.toString() + ")";
}
return ua;
}
private UpdateResult parseResponse(TreeLogger branch, Preferences prefs,
byte[] response) throws IOException, ParserConfigurationException,
SAXException {
branch.log(CHECK_SPAM, "Parsing response (length " + response.length + ")");
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
ByteArrayInputStream bais = new ByteArrayInputStream(response);
// Parse the XML.
//
builder.setErrorHandler(new ErrorHandler() {
@Override
public void error(SAXParseException exception) throws SAXException {
// fail quietly
}
@Override
public void fatalError(SAXParseException exception) throws SAXException {
// fail quietly
}
@Override
public void warning(SAXParseException exception) throws SAXException {
// fail quietly
}
});
Document doc = builder.parse(bais);
// The latest version number.
//
String versionString = getTextOfLastElementHavingTag(doc, "latest-version");
if (versionString == null) {
// Not valid; quietly fail.
//
branch.log(CHECK_ERROR, "Failed to find ");
return null;
}
GwtVersion currentReleasedVersion;
try {
currentReleasedVersion = new GwtVersion(versionString.trim());
} catch (NumberFormatException e) {
branch.log(CHECK_ERROR, "Bad version: " + versionString, e);
return null;
}
// Ping delay for server-controlled throttling.
//
String pingDelaySecsStr = getTextOfLastElementHavingTag(doc,
"min-wait-seconds");
int pingDelaySecs = 0;
if (pingDelaySecsStr == null) {
// Not valid; quietly fail.
//
branch.log(CHECK_ERROR, "Missing ");
return null;
}
try {
pingDelaySecs = Integer.parseInt(pingDelaySecsStr.trim());
} catch (NumberFormatException e) {
// Not a valid number; quietly fail.
//
branch.log(CHECK_ERROR, "Bad min-wait-seconds number: "
+ pingDelaySecsStr);
return null;
}
String url = getTextOfLastElementHavingTag(doc, "notification-url");
if (url == null) {
// no URL, so write the HTML locally and provide a URL from that
// Read the HTML.
//
String html = getTextOfLastElementHavingTag(doc, "notification");
if (html == null) {
// Not valid; quietly fail.
//
branch.log(CHECK_ERROR, "Missing ");
return null;
}
PrintWriter writer = null;
try {
String tempDir = System.getProperty("java.io.tmpdir");
File updateHtml = new File(tempDir, "gwt-update-"
+ currentReleasedVersion + ".html");
writer = new PrintWriter(new FileOutputStream(updateHtml));
writer.print(html);
url = "file://" + updateHtml.getAbsolutePath();
} finally {
if (writer != null) {
writer.close();
}
}
}
// Okay -- this is a valid response.
//
return processResponse(branch, prefs, currentReleasedVersion,
pingDelaySecs, url);
}
private UpdateResult processResponse(TreeLogger branch, Preferences prefs,
final GwtVersion serverVersion, int pingDelaySecs, final String notifyUrl) {
// Record a ping; don't ping again until the delay is up.
//
long currentTimeMillis = System.currentTimeMillis();
long nextPingTime = currentTimeMillis + pingDelaySecs * 1000;
prefs.put(NEXT_PING, String.valueOf(nextPingTime));
prefs.put(LAST_PING, String.valueOf(currentTimeMillis));
branch.log(CHECK_INFO, "Ping delay is " + pingDelaySecs + "; next ping at "
+ new Date(nextPingTime));
if (myVersion.isNoNagVersion()) {
// If the version number indicates no nagging about updates, exit here
// once we have recorded the next ping time. No-nag versions (ie,
// trunk builds) should also not update the highest version that has been
// run.
return null;
}
// Update the highest version of GWT that has been run if we are later.
GwtVersion highestRunVersion = new GwtVersion(prefs.get(
HIGHEST_RUN_VERSION, null));
if (myVersion.compareTo(highestRunVersion) > 0) {
highestRunVersion = myVersion;
prefs.put(HIGHEST_RUN_VERSION, highestRunVersion.toString());
}
// Are we up to date already?
//
if (highestRunVersion.compareTo(serverVersion) >= 0) {
// Yes, we are.
//
branch.log(CHECK_INFO, "Server version (" + serverVersion
+ ") is not newer than " + highestRunVersion);
return null;
}
// Commence nagging.
//
URL url = null;
try {
url = new URL(notifyUrl);
} catch (MalformedURLException e) {
logger.log(CHECK_ERROR, "Malformed notify URL: " + notifyUrl, e);
}
final URL finalUrl = url;
return new UpdateResult() {
@Override
public GwtVersion getNewVersion() {
return serverVersion;
}
@Override
public URL getURL() {
return finalUrl;
}
};
}
}
