Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 1 | package net.floodlightcontroller.mastership; |
| 2 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 3 | import java.io.IOException; |
| 4 | import java.net.UnknownHostException; |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 5 | import java.util.ArrayList; |
| 6 | import java.util.Collection; |
| 7 | import java.util.HashMap; |
| 8 | import java.util.Map; |
| 9 | |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 10 | import net.floodlightcontroller.core.module.FloodlightModuleContext; |
| 11 | import net.floodlightcontroller.core.module.FloodlightModuleException; |
| 12 | import net.floodlightcontroller.core.module.IFloodlightModule; |
| 13 | import net.floodlightcontroller.core.module.IFloodlightService; |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 14 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 15 | import org.apache.zookeeper.WatchedEvent; |
| 16 | import org.openflow.util.HexString; |
| 17 | import org.slf4j.Logger; |
| 18 | import org.slf4j.LoggerFactory; |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 19 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 20 | import com.netflix.curator.RetryPolicy; |
| 21 | import com.netflix.curator.framework.CuratorFramework; |
| 22 | import com.netflix.curator.framework.CuratorFrameworkFactory; |
| 23 | import com.netflix.curator.framework.api.CuratorWatcher; |
| 24 | import com.netflix.curator.framework.recipes.leader.LeaderLatch; |
| 25 | import com.netflix.curator.framework.recipes.leader.Participant; |
| 26 | import com.netflix.curator.framework.state.ConnectionState; |
| 27 | import com.netflix.curator.framework.state.ConnectionStateListener; |
| 28 | import com.netflix.curator.retry.ExponentialBackoffRetry; |
| 29 | |
| 30 | public class MastershipManager implements IFloodlightModule, IMastershipService, |
| 31 | ConnectionStateListener { |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 32 | protected static Logger log = LoggerFactory.getLogger(MastershipManager.class); |
| 33 | protected String mastershipId; |
| 34 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 35 | //TODO read this from configuration |
| 36 | protected String connectionString = "localhost:2181"; |
| 37 | private final String namespace = "onos"; |
| 38 | private final String switchLatchesPath = "/switchmastership"; |
| 39 | |
| 40 | protected CuratorFramework client; |
| 41 | |
| 42 | protected Map<String, LeaderLatch> switchLatches; |
| 43 | protected Map<String, MastershipCallback> switchCallbacks; |
| 44 | |
| 45 | //protected final String singleLatchPath = switchLatchesPath + "/00:00:00:00:00:00:00:01"; |
| 46 | //protected LeaderLatch singleLatch; |
| 47 | |
| 48 | |
| 49 | protected class ParamaterizedCuratorWatcher implements CuratorWatcher { |
| 50 | private String dpid; |
| 51 | private String latchPath; |
| 52 | |
| 53 | public ParamaterizedCuratorWatcher(String dpid, String latchPath){ |
| 54 | this.dpid = dpid; |
| 55 | this.latchPath = latchPath; |
| 56 | } |
| 57 | |
| 58 | @Override |
| 59 | public void process(WatchedEvent event) throws Exception { |
| 60 | log.debug("Watch Event: {}", event); |
| 61 | |
| 62 | LeaderLatch latch = switchLatches.get(dpid); |
| 63 | |
| 64 | Participant leader = latch.getLeader(); |
| 65 | |
| 66 | log.debug("Leader for {} changed. Now {}", dpid, leader.getId()); |
| 67 | |
| 68 | if (leader.getId().equals(mastershipId)){ |
| 69 | switchCallbacks.get(dpid).changeCallback(HexString.toLong(dpid), true); |
| 70 | } |
| 71 | |
| 72 | client.getChildren().usingWatcher(this).inBackground().forPath(latchPath); |
| 73 | //client.getChildren().usingWatcher(this).forPath(latchPath); |
| 74 | } |
| 75 | }; |
| 76 | |
| 77 | @Override |
| 78 | public void acquireMastership(long dpid, MastershipCallback cb) { |
| 79 | //TODO check if there's already a latch in the list |
| 80 | //TODO throw exception if unique ID not set |
| 81 | //TODO use unique ID |
| 82 | if (cb == null) { |
| 83 | //TODO throw exception? |
| 84 | } |
| 85 | |
| 86 | String dpidStr = HexString.toHexString(dpid); |
| 87 | String latchPath = switchLatchesPath + "/" + dpidStr; |
| 88 | |
| 89 | LeaderLatch latch = new LeaderLatch(client, latchPath, mastershipId); |
| 90 | switchLatches.put(dpidStr, latch); |
| 91 | //if (switchCallbacks.put(dpidStr, cb) != cb){ |
| 92 | //NOTE instance equality intended |
| 93 | // log.debug("Throwing out old callback for switch {}: {}", dpidStr, cb); |
| 94 | //} |
| 95 | switchCallbacks.put(dpidStr, cb); |
| 96 | |
| 97 | try { |
| 98 | //client.getChildren().usingWatcher(watcher).inBackground().forPath(singleLatchPath); |
| 99 | client.getChildren().usingWatcher( |
| 100 | new ParamaterizedCuratorWatcher(dpidStr, latchPath)) |
| 101 | .inBackground().forPath(latchPath); |
| 102 | latch.start(); |
| 103 | } catch (Exception e) { |
| 104 | log.debug("WATCHER ERROROROROR"); |
| 105 | e.printStackTrace(); |
| 106 | } |
| 107 | |
| 108 | } |
| 109 | |
| 110 | @Override |
| 111 | public void releaseMastership(long dpid) { |
| 112 | // TODO Auto-generated method stub |
| 113 | LeaderLatch latch = switchLatches.get(HexString.toHexString(dpid)); |
| 114 | if (latch == null) { |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | try { |
| 119 | latch.close(); |
| 120 | } catch (IOException e) { |
| 121 | |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | @Override |
| 126 | public boolean amMaster(long dpid) { |
| 127 | LeaderLatch latch = switchLatches.get(HexString.toHexString(dpid)); |
| 128 | |
| 129 | if (latch == null) { |
| 130 | log.warn("No leader latch for dpid {}", HexString.toHexString(dpid)); |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | //return latch.hasLeadership(); |
| 135 | try { |
| 136 | return latch.getLeader().getId().equals(mastershipId); |
| 137 | } catch (Exception e) { |
| 138 | //TODO swallow exception? |
| 139 | return false; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | @Override |
| 144 | public void setMastershipId(String id) { |
| 145 | // TODO Synchronisation? |
| 146 | mastershipId = id; |
| 147 | } |
| 148 | |
| 149 | @Override |
| 150 | public String getMastershipId() { |
| 151 | // TODO Synchronisation? |
| 152 | return mastershipId; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * ConnectionStateListener |
| 157 | */ |
| 158 | |
| 159 | @Override |
| 160 | public void stateChanged(CuratorFramework client, ConnectionState state) { |
| 161 | // TODO Auto-generated method stub |
| 162 | log.debug("Connection state change: {}", state); |
| 163 | |
| 164 | switch (state){ |
| 165 | case SUSPENDED: |
| 166 | case LOST: |
| 167 | //If we're suspended or lost, we can no longer assume mastership |
| 168 | for (Map.Entry<String, MastershipCallback> entry : switchCallbacks.entrySet()){ |
| 169 | entry.getValue().changeCallback(HexString.toLong(entry.getKey()), false); |
| 170 | } |
| 171 | break; |
| 172 | default: |
| 173 | //CONNECTED or RECONNECTED |
| 174 | //LeaderLatches should automatically try and re-gain the leadership |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * IFloodlightModule |
| 181 | */ |
| 182 | |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 183 | @Override |
| 184 | public Collection<Class<? extends IFloodlightService>> getModuleServices() { |
| 185 | Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); |
| 186 | l.add(IMastershipService.class); |
| 187 | return l; |
| 188 | } |
| 189 | |
| 190 | @Override |
| 191 | public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() { |
| 192 | Map<Class<? extends IFloodlightService>, IFloodlightService> m = |
| 193 | new HashMap<Class<? extends IFloodlightService>, IFloodlightService>(); |
| 194 | m.put(IMastershipService.class, this); |
| 195 | return m; |
| 196 | } |
| 197 | |
| 198 | @Override |
| 199 | public Collection<Class<? extends IFloodlightService>> getModuleDependencies() { |
| 200 | // no module dependencies |
| 201 | return null; |
| 202 | } |
| 203 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 204 | //be ready to serve mastership requests by startup? |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 205 | @Override |
| 206 | public void init (FloodlightModuleContext context) throws FloodlightModuleException { |
| 207 | //TODO |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 208 | try { |
| 209 | String localHostname = java.net.InetAddress.getLocalHost().getHostName(); |
| 210 | mastershipId = localHostname; |
| 211 | log.debug("Setting mastership id to {}", mastershipId); |
| 212 | } catch (UnknownHostException e) { |
| 213 | // TODO Handle this exception |
| 214 | e.printStackTrace(); |
| 215 | } |
| 216 | |
| 217 | switchLatches = new HashMap<String, LeaderLatch>(); |
| 218 | switchCallbacks = new HashMap<String, MastershipCallback>(); |
| 219 | |
| 220 | RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3); |
| 221 | client = CuratorFrameworkFactory.newClient(connectionString, retryPolicy); |
| 222 | |
| 223 | client.start(); |
| 224 | |
| 225 | client = client.usingNamespace(namespace); |
| 226 | |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 227 | return; |
| 228 | } |
| 229 | |
| 230 | @Override |
| 231 | public void startUp (FloodlightModuleContext context) { |
| 232 | //TODO |
| 233 | return; |
| 234 | } |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 235 | |
| 236 | public static void main(String args[]){ |
| 237 | FloodlightModuleContext fmc = new FloodlightModuleContext(); |
| 238 | MastershipManager mm = new MastershipManager(); |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 239 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 240 | if (args.length < 1){ |
| 241 | log.error("Need to supply ID"); |
| 242 | System.exit(1); |
| 243 | } |
| 244 | String id = args[0]; |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 245 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 246 | try { |
| 247 | mm.init(fmc); |
| 248 | mm.startUp(fmc); |
| 249 | |
| 250 | mm.setMastershipId(id); |
| 251 | |
| 252 | mm.acquireMastership(1L, |
| 253 | new MastershipCallback(){ |
| 254 | @Override |
| 255 | public void changeCallback(long dpid, boolean isMaster) { |
| 256 | if (isMaster){ |
| 257 | log.debug("I'm master for {}", HexString.toHexString(dpid)); |
| 258 | } |
| 259 | else { |
| 260 | log.debug("NOT master for {}", HexString.toHexString(dpid)); |
| 261 | } |
| 262 | } |
| 263 | }); |
| 264 | |
| 265 | //"Server" loop |
| 266 | while (true) { |
| 267 | Thread.sleep(60000); |
| 268 | } |
| 269 | |
| 270 | } catch (FloodlightModuleException e) { |
| 271 | // TODO Auto-generated catch block |
| 272 | e.printStackTrace(); |
| 273 | } catch (InterruptedException e) { |
| 274 | // TODO Auto-generated catch block |
| 275 | e.printStackTrace(); |
| 276 | } |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 277 | |
Jonathan Hart | bd181b6 | 2013-02-17 16:05:38 -0800 | [diff] [blame^] | 278 | log.debug("is master: {}", mm.amMaster(1L)); |
Umesh Krishnaswamy | b56bb29 | 2013-02-12 20:28:27 -0800 | [diff] [blame] | 279 | } |
| 280 | } |