| package net.floodlightcontroller.mastership; |
| |
| import java.io.IOException; |
| import java.net.UnknownHostException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import net.floodlightcontroller.core.module.FloodlightModuleContext; |
| import net.floodlightcontroller.core.module.FloodlightModuleException; |
| import net.floodlightcontroller.core.module.IFloodlightModule; |
| import net.floodlightcontroller.core.module.IFloodlightService; |
| |
| import org.apache.zookeeper.WatchedEvent; |
| import org.openflow.util.HexString; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.netflix.curator.RetryPolicy; |
| import com.netflix.curator.framework.CuratorFramework; |
| import com.netflix.curator.framework.CuratorFrameworkFactory; |
| import com.netflix.curator.framework.api.CuratorWatcher; |
| import com.netflix.curator.framework.recipes.leader.LeaderLatch; |
| import com.netflix.curator.framework.recipes.leader.Participant; |
| import com.netflix.curator.framework.state.ConnectionState; |
| import com.netflix.curator.framework.state.ConnectionStateListener; |
| import com.netflix.curator.retry.ExponentialBackoffRetry; |
| |
| public class MastershipManager implements IFloodlightModule, IMastershipService, |
| ConnectionStateListener { |
| protected static Logger log = LoggerFactory.getLogger(MastershipManager.class); |
| protected String mastershipId; |
| |
| //TODO read this from configuration |
| protected String connectionString = "localhost:2181"; |
| private final String namespace = "onos"; |
| private final String switchLatchesPath = "/switchmastership"; |
| |
| protected CuratorFramework client; |
| |
| protected Map<String, LeaderLatch> switchLatches; |
| protected Map<String, MastershipCallback> switchCallbacks; |
| |
| //protected final String singleLatchPath = switchLatchesPath + "/00:00:00:00:00:00:00:01"; |
| //protected LeaderLatch singleLatch; |
| |
| |
| protected class ParamaterizedCuratorWatcher implements CuratorWatcher { |
| private String dpid; |
| private String latchPath; |
| |
| public ParamaterizedCuratorWatcher(String dpid, String latchPath){ |
| this.dpid = dpid; |
| this.latchPath = latchPath; |
| } |
| |
| @Override |
| public void process(WatchedEvent event) throws Exception { |
| log.debug("Watch Event: {}", event); |
| |
| LeaderLatch latch = switchLatches.get(dpid); |
| |
| Participant leader = latch.getLeader(); |
| |
| log.debug("Leader for {} changed. Now {}", dpid, leader.getId()); |
| |
| if (leader.getId().equals(mastershipId)){ |
| switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), true); |
| } |
| |
| client.getChildren().usingWatcher(this).inBackground().forPath(latchPath); |
| //client.getChildren().usingWatcher(this).forPath(latchPath); |
| } |
| }; |
| |
| @Override |
| public void acquireMastership(long dpid, MastershipCallback cb) { |
| //TODO check if there's already a latch in the list |
| //TODO throw exception if unique ID not set |
| //TODO use unique ID |
| if (cb == null) { |
| //TODO throw exception? |
| } |
| |
| String dpidStr = HexString.toHexString(dpid); |
| String latchPath = switchLatchesPath + "/" + dpidStr; |
| |
| LeaderLatch latch = new LeaderLatch(client, latchPath, mastershipId); |
| switchLatches.put(dpidStr, latch); |
| //if (switchCallbacks.put(dpidStr, cb) != cb){ |
| //NOTE instance equality intended |
| // log.debug("Throwing out old callback for switch {}: {}", dpidStr, cb); |
| //} |
| switchCallbacks.put(dpidStr, cb); |
| |
| try { |
| //client.getChildren().usingWatcher(watcher).inBackground().forPath(singleLatchPath); |
| client.getChildren().usingWatcher( |
| new ParamaterizedCuratorWatcher(dpidStr, latchPath)) |
| .inBackground().forPath(latchPath); |
| latch.start(); |
| } catch (Exception e) { |
| log.debug("WATCHER ERROROROROR"); |
| e.printStackTrace(); |
| } |
| |
| } |
| |
| @Override |
| public void releaseMastership(long dpid) { |
| // TODO Auto-generated method stub |
| LeaderLatch latch = switchLatches.get(HexString.toHexString(dpid)); |
| if (latch == null) { |
| return; |
| } |
| |
| try { |
| latch.close(); |
| } catch (IOException e) { |
| |
| } |
| } |
| |
| @Override |
| public boolean amMaster(long dpid) { |
| LeaderLatch latch = switchLatches.get(HexString.toHexString(dpid)); |
| |
| if (latch == null) { |
| log.warn("No leader latch for dpid {}", HexString.toHexString(dpid)); |
| return false; |
| } |
| |
| //return latch.hasLeadership(); |
| try { |
| return latch.getLeader().getId().equals(mastershipId); |
| } catch (Exception e) { |
| //TODO swallow exception? |
| return false; |
| } |
| } |
| |
| @Override |
| public void setMastershipId(String id) { |
| // TODO Synchronisation? |
| mastershipId = id; |
| } |
| |
| @Override |
| public String getMastershipId() { |
| // TODO Synchronisation? |
| return mastershipId; |
| } |
| |
| /* |
| * ConnectionStateListener |
| */ |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState state) { |
| // TODO Auto-generated method stub |
| log.debug("Connection state change: {}", state); |
| |
| switch (state){ |
| case SUSPENDED: |
| case LOST: |
| //If we're suspended or lost, we can no longer assume mastership |
| for (Map.Entry<String, MastershipCallback> entry : switchCallbacks.entrySet()){ |
| entry.getValue().changeCallback(HexString.toLong(entry.getKey()), false); |
| } |
| break; |
| default: |
| //CONNECTED or RECONNECTED |
| //LeaderLatches should automatically try and re-gain the leadership |
| break; |
| } |
| } |
| |
| /* |
| * IFloodlightModule |
| */ |
| |
| @Override |
| public Collection<Class<? extends IFloodlightService>> getModuleServices() { |
| Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); |
| l.add(IMastershipService.class); |
| return l; |
| } |
| |
| @Override |
| public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() { |
| Map<Class<? extends IFloodlightService>, IFloodlightService> m = |
| new HashMap<Class<? extends IFloodlightService>, IFloodlightService>(); |
| m.put(IMastershipService.class, this); |
| return m; |
| } |
| |
| @Override |
| public Collection<Class<? extends IFloodlightService>> getModuleDependencies() { |
| // no module dependencies |
| return null; |
| } |
| |
| //be ready to serve mastership requests by startup? |
| @Override |
| public void init (FloodlightModuleContext context) throws FloodlightModuleException { |
| //TODO |
| try { |
| String localHostname = java.net.InetAddress.getLocalHost().getHostName(); |
| mastershipId = localHostname; |
| log.debug("Setting mastership id to {}", mastershipId); |
| } catch (UnknownHostException e) { |
| // TODO Handle this exception |
| e.printStackTrace(); |
| } |
| |
| switchLatches = new HashMap<String, LeaderLatch>(); |
| switchCallbacks = new HashMap<String, MastershipCallback>(); |
| |
| RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3); |
| client = CuratorFrameworkFactory.newClient(connectionString, retryPolicy); |
| |
| client.start(); |
| |
| client = client.usingNamespace(namespace); |
| |
| return; |
| } |
| |
| @Override |
| public void startUp (FloodlightModuleContext context) { |
| //TODO |
| return; |
| } |
| |
| public static void main(String args[]){ |
| FloodlightModuleContext fmc = new FloodlightModuleContext(); |
| MastershipManager mm = new MastershipManager(); |
| |
| if (args.length < 1){ |
| log.error("Need to supply ID"); |
| System.exit(1); |
| } |
| String id = args[0]; |
| |
| try { |
| mm.init(fmc); |
| mm.startUp(fmc); |
| |
| mm.setMastershipId(id); |
| |
| mm.acquireMastership(1L, |
| new MastershipCallback(){ |
| @Override |
| public void changeCallback(long dpid, boolean isMaster) { |
| if (isMaster){ |
| log.debug("I'm master for {}", HexString.toHexString(dpid)); |
| } |
| else { |
| log.debug("NOT master for {}", HexString.toHexString(dpid)); |
| } |
| } |
| }); |
| |
| //"Server" loop |
| while (true) { |
| Thread.sleep(60000); |
| } |
| |
| } catch (FloodlightModuleException e) { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| } catch (InterruptedException e) { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| } |
| |
| log.debug("is master: {}", mm.amMaster(1L)); |
| } |
| } |