private static void handleFilepath() {
final BufferedReader br;
try {
br = new BufferedReader(new FileReader(filePath));
} catch (FileNotFoundException e) {
throw new RuntimeException("File not found: " + filePath, e);
}
String line;
try {
while ((line = br.readLine()) != null) {
try {
cloudname.createCoordinate(Coordinate.parse(line));
System.out.println("Created " + line);
} catch (Exception e) {
System.err.println("Could not create: " + line + "Got error: " + e.getMessage());
}
}
} catch (IOException e) {
throw new RuntimeException("Failed to read coordinate from file. " + e.getMessage(), e);
} finally {
cloudname.close();
try {
br.close();
} catch (IOException e) {
System.err.println("Failed while trying to close file reader. " + e.getMessage());
}
}
}
/**
* Tests the behavior of Zookeeper upon a restart. ZK should clean up old coordinates.
*
* @throws Exception
*/
@Test
public void testZookeeperRestarts() throws Exception {
final CountDownLatch connectedLatch1 = new CountDownLatch(1);
final CountDownLatch connectedLatch2 = new CountDownLatch(3);
TestCoordinateListener listener = setUpListenerEnvironment(connectedLatch1, connectedLatch2);
assertTrue(connectedLatch1.await(20, TimeUnit.SECONDS));
log.info("Killing zookeeper");
forwarder.terminate();
ezk.shutdown();
ezk.del();
ezk.init();
Thread.sleep(2000);
forwarder = new PortForwarder(forwarderPort, "127.0.0.1", zkport);
int timeoutSecs = 30;
while (--timeoutSecs > 0) {
Thread.sleep(1000);
}
Coordinate c = Coordinate.parse("1.service.user.cell");
cn.createCoordinate(c);
Thread.sleep(9000);
assertEquals(
listener.events.get(listener.events.size() - 1), CoordinateListener.Event.COORDINATE_OK);
}
private static void handleResolverExpression() {
final Resolver resolver = cloudname.getResolver();
try {
System.out.println(
"Added a resolver listener for expression: "
+ resolverExpression
+ ". Will print out all events for the given expression.");
resolver.addResolverListener(
resolverExpression,
new ResolverListener() {
@Override
public void endpointEvent(Event event, Endpoint endpoint) {
System.out.println("Received event: " + event + " for endpoint: " + endpoint);
}
});
} catch (CloudnameException e) {
System.err.println("Problem with cloudname: " + e.getMessage());
}
final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
while (true) {
System.out.println("Press enter to exit");
String s = null;
try {
s = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
if (s.length() == 0) {
System.out.println("Exiting");
System.exit(0);
}
}
}
private TestCoordinateListener setUpListenerEnvironment(
CountDownLatch connectedLatch1, CountDownLatch connectedLatch2) throws Exception {
forwarderPort = Net.getFreePort();
forwarder = new PortForwarder(forwarderPort, "127.0.0.1", zkport);
final Coordinate c = Coordinate.parse("1.service.user.cell");
cn = makeLocalZkCloudname(forwarderPort);
try {
cn.createCoordinate(c);
} catch (CoordinateException e) {
fail(e.toString());
}
final TestCoordinateListener listener =
new TestCoordinateListener(connectedLatch1, connectedLatch2);
ServiceHandle serviceHandle = cn.claim(c);
serviceHandle.registerCoordinateListener(listener);
return listener;
}
public static void main(final String[] args) {
// Disable log system, we want full control over what is sent to console.
final ConsoleAppender consoleAppender = new ConsoleAppender();
consoleAppender.activateOptions();
consoleAppender.setLayout(new PatternLayout("%p %t %C:%M %m%n"));
consoleAppender.setThreshold(Level.OFF);
BasicConfigurator.configure(consoleAppender);
// Parse the flags.
Flags flags = new Flags().loadOpts(ZkTool.class).parse(args);
// Check if we wish to print out help text
if (flags.helpFlagged()) {
flags.printHelp(System.out);
System.out.println("Must specify one of the following options:");
System.out.println(actionSelectingFlagNames);
return;
}
checkArgumentCombinationValid(flags);
ZkCloudname.Builder builder = new ZkCloudname.Builder();
if (zooKeeperFlag == null) {
builder.setDefaultConnectString();
} else {
builder.setConnectString(zooKeeperFlag);
}
try {
cloudname = builder.build().connect();
} catch (CloudnameException e) {
System.err.println("Could not connect to zookeeper " + e.getMessage());
return;
}
try {
if (filePath != null) {
handleFilepath();
} else if (coordinateFlag != null) {
handleCoordinateOperation();
} else if (resolverExpression != null) {
handleResolverExpression();
} else if (listFlag) {
listCoordinates();
} else {
System.err.println("No action specified");
}
} catch (Exception e) {
System.err.println("An error occurred: " + e.getMessage());
e.printStackTrace();
} finally {
cloudname.close();
}
}
private static void listCoordinates() {
try {
final List<String> nodeList = new ArrayList<String>();
cloudname.listRecursively(nodeList);
for (final String node : nodeList) {
final Matcher m = instanceConfigPattern.matcher(node);
/*
* We only parse config paths, and we convert these to
* Cloudname coordinates to not confuse the user.
*/
if (m.matches()) {
System.out.printf("%s.%s.%s.%s\n", m.group(4), m.group(3), m.group(2), m.group(1));
}
}
} catch (final CloudnameException e) {
System.err.println("Got error: " + e.getMessage());
} catch (final InterruptedException e) {
System.err.println("Got error: " + e.getMessage());
}
}
private static void handleCoordinateOperation() {
final Resolver resolver = cloudname.getResolver();
final Coordinate coordinate = Coordinate.parse(coordinateFlag);
switch (operationFlag) {
case CREATE:
try {
cloudname.createCoordinate(coordinate);
} catch (CloudnameException e) {
System.err.println("Got error: " + e.getMessage());
break;
} catch (CoordinateExistsException e) {
e.printStackTrace();
break;
}
System.err.println("Created coordinate.");
break;
case DELETE:
try {
cloudname.destroyCoordinate(coordinate);
} catch (CoordinateDeletionException e) {
System.err.println("Got error: " + e.getMessage());
return;
} catch (CoordinateMissingException e) {
System.err.println("Got error: " + e.getMessage());
break;
} catch (CloudnameException e) {
System.err.println("Got error: " + e.getMessage());
break;
}
System.err.println("Deleted coordinate.");
break;
case STATUS:
{
ServiceStatus status;
try {
status = cloudname.getStatus(coordinate);
} catch (CloudnameException e) {
System.err.println(
"Problems loading status, is service running? Error:\n" + e.getMessage());
break;
}
System.err.println(
"Status:\n" + status.getState().toString() + " " + status.getMessage());
List<Endpoint> endpoints = null;
try {
endpoints =
resolver.resolve(
"all."
+ coordinate.getService()
+ "."
+ coordinate.getUser()
+ "."
+ coordinate.getCell());
} catch (CloudnameException e) {
System.err.println("Got error: " + e.getMessage());
break;
}
System.err.println("Endpoints:");
for (Endpoint endpoint : endpoints) {
if (endpoint.getCoordinate().getInstance() == coordinate.getInstance()) {
System.err.println(
endpoint.getName()
+ "-->"
+ endpoint.getHost()
+ ":"
+ endpoint.getPort()
+ " protocol:"
+ endpoint.getProtocol());
System.err.println("Endpoint data:\n" + endpoint.getEndpointData());
}
}
break;
}
case HOST:
{
List<Endpoint> endpoints = null;
try {
endpoints = resolver.resolve(coordinate.asString());
} catch (CloudnameException e) {
System.err.println(
"Could not resolve " + coordinate.asString() + " Error:\n" + e.getMessage());
break;
}
for (Endpoint endpoint : endpoints) {
System.out.println("Host: " + endpoint.getHost());
}
}
break;
case SET_CONFIG:
try {
cloudname.setConfig(coordinate, configFlag, null);
} catch (CloudnameException e) {
System.err.println("Got error: " + e.getMessage());
break;
} catch (CoordinateMissingException e) {
System.err.println("Non-existing coordinate.");
}
System.err.println("Config updated.");
break;
case READ_CONFIG:
try {
System.out.println("Config is:" + cloudname.getConfig(coordinate));
} catch (CoordinateMissingException e) {
System.err.println("Non-existing coordinate.");
} catch (CloudnameException e) {
System.err.println("Problem with cloudname: " + e.getMessage());
}
break;
default:
System.out.println("Unknown command " + operationFlag);
}
}
