verification.py 17.7 KB
Newer Older
Aurel's avatar
Aurel committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
#
# Copyright (C) 2006-2009  Nexedi SA
# 
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

18 19
import logging

20
from neo.protocol import MASTER_NODE_TYPE, STORAGE_NODE_TYPE, CLIENT_NODE_TYPE, \
21 22
        RUNNING_STATE, BROKEN_STATE, TEMPORARILY_DOWN_STATE, DOWN_STATE
from neo.master.handler import MasterEventHandler
23
from neo.exception import VerificationFailure, ElectionFailure
24 25
from neo.protocol import Packet, INVALID_UUID
from neo.util import dump
26
from neo.node import ClientNode, StorageNode, MasterNode
27 28 29 30 31 32 33 34 35 36 37 38

class VerificationEventHandler(MasterEventHandler):
    """This class deals with events for a verification phase."""

    def connectionClosed(self, conn):
        uuid = conn.getUUID()
        if uuid is not None:
            app = self.app
            node = app.nm.getNodeByUUID(uuid)
            if node.getState() == RUNNING_STATE:
                node.setState(TEMPORARILY_DOWN_STATE)
                app.broadcastNodeInformation(node)
39
                if node.getNodeType() == CLIENT_NODE_TYPE:
40 41
                    # If this node is a client, just forget it.
                    app.nm.remove(node)
42
                elif node.getNodeType() == STORAGE_NODE_TYPE:
43 44 45 46 47 48 49 50 51 52 53 54 55
                    if not app.pt.operational():
                        # Catastrophic.
                        raise VerificationFailure, 'cannot continue verification'
        MasterEventHandler.connectionClosed(self, conn)

    def timeoutExpired(self, conn):
        uuid = conn.getUUID()
        if uuid is not None:
            app = self.app
            node = app.nm.getNodeByUUID(uuid)
            if node.getState() == RUNNING_STATE:
                node.setState(TEMPORARILY_DOWN_STATE)
                app.broadcastNodeInformation(node)
56
                if node.getNodeType() == CLIENT_NODE_TYPE:
57 58
                    # If this node is a client, just forget it.
                    app.nm.remove(node)
59
                elif node.getNodeType() == STORAGE_NODE_TYPE:
60 61 62 63 64 65 66 67 68 69 70 71 72
                    if not app.pt.operational():
                        # Catastrophic.
                        raise VerificationFailure, 'cannot continue verification'
        MasterEventHandler.timeoutExpired(self, conn)

    def peerBroken(self, conn):
        uuid = conn.getUUID()
        if uuid is not None:
            app = self.app
            node = app.nm.getNodeByUUID(uuid)
            if node.getState() != BROKEN_STATE:
                node.setState(BROKEN_STATE)
                app.broadcastNodeInformation(node)
73
                if node.getNodeType() == CLIENT_NODE_TYPE:
74 75
                    # If this node is a client, just forget it.
                    app.nm.remove(node)
76
                elif node.getNodeType() == STORAGE_NODE_TYPE:
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109
                    cell_list = app.pt.dropNode(node)
                    ptid = app.getNextPartitionTableID()
                    app.broadcastPartitionChanges(ptid, cell_list)
                    if not app.pt.operational():
                        # Catastrophic.
                        raise VerificationFailure, 'cannot continue verification'
        MasterEventHandler.peerBroken(self, conn)

    def packetReceived(self, conn, packet):
        MasterEventHandler.packetReceived(self, conn, packet)

    def handleRequestNodeIdentification(self, conn, packet, node_type,
                                        uuid, ip_address, port, name):
        app = self.app
        if node_type not in (MASTER_NODE_TYPE, STORAGE_NODE_TYPE):
            logging.info('reject a connection from a client')
            conn.addPacket(Packet().notReady(packet.getId(), 'retry later'))
            conn.abort()
            return
        if name != app.name:
            logging.error('reject an alien cluster')
            conn.addPacket(Packet().protocolError(packet.getId(),
                                                  'invalid cluster name'))
            conn.abort()
            return

        # Here are many situations. In principle, a node should be identified by
        # an UUID, since an UUID never change when moving a storage node to a different
        # server, and an UUID always changes for a master node and a client node whenever
        # it restarts, so more reliable than a server address.
        # 
        # However, master nodes can be known only as the server addresses. And, a node
        # may claim a server address used by another node.
110

111 112 113
        addr = (ip_address, port)
        # First, get the node by the UUID.
        node = app.nm.getNodeByUUID(uuid)
114 115 116
        if node is not None and node.getServer() != addr:
            # Here we have an UUID conflict, assume that's a new node
            node = None
117
        if node is None:
118 119 120
            # generate a new uuid for this node
            while not app.isValidUUID(uuid, addr):
                uuid = app.getNewUUID(node_type)
121 122 123 124 125 126 127 128
            # If nothing is present, try with the server address.
            node = app.nm.getNodeByServer(addr)
            if node is None:
                # Nothing is found. So this must be the first time that this node
                # connected to me.
                if node_type == MASTER_NODE_TYPE:
                    node = MasterNode(server = addr, uuid = uuid)
                else:
129
                    node = StorageNode(server = addr, uuid = uuid)
130 131 132 133 134 135 136
                app.nm.add(node)
                app.broadcastNodeInformation(node)
            else:
                # Otherwise, I know it only by the server address or the same server
                # address but with a different UUID.
                if node.getUUID() is None:
                    # This must be a master node.
137
                    if node.getNodeType() != MASTER_NODE_TYPE or node_type != MASTER_NODE_TYPE:
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200
                        # Error. This node uses the same server address as a master
                        # node.
                        conn.addPacket(Packet().protocolError(packet.getId(),
                                                              'invalid server address'))
                        conn.abort()
                        return

                    node.setUUID(uuid)
                    if node.getState() != RUNNING_STATE:
                        node.setState(RUNNING_STATE)
                    app.broadcastNodeInformation(node)
                else:
                    # This node has a different UUID.
                    if node.getState() == RUNNING_STATE:
                        # If it is still running, reject this node.
                        conn.addPacket(Packet().protocolError(packet.getId(),
                                                              'invalid server address'))
                        conn.abort()
                        return
                    else:
                        # Otherwise, forget the old one.
                        node.setState(BROKEN_STATE)
                        app.broadcastNodeInformation(node)
                        # And insert a new one.
                        node.setUUID(uuid)
                        node.setState(RUNNING_STATE)
                        app.broadcastNodeInformation(node)
        else:
            # I know this node by the UUID.
            if node.getServer() != addr:
                # This node has a different server address.
                if node.getState() == RUNNING_STATE:
                    # If it is still running, reject this node.
                    conn.addPacket(Packet().protocolError(packet.getId(),
                                                          'invalid server address'))
                    conn.abort()
                    return
                else:
                    # Otherwise, forget the old one.
                    node.setState(BROKEN_STATE)
                    app.broadcastNodeInformation(node)
                    # And insert a new one.
                    node.setServer(addr)
                    node.setState(RUNNING_STATE)
                    app.broadcastNodeInformation(node)
            else:
                # If this node is broken, reject it. Otherwise, assume that it is
                # working again.
                if node.getState() == BROKEN_STATE:
                    p = Packet()
                    p.brokenNodeDisallowedError(packet.getId(), 'go away')
                    conn.addPacket(p)
                    conn.abort()
                    return
                else:
                    node.setUUID(uuid)
                    node.setState(RUNNING_STATE)
                    app.broadcastNodeInformation(node)

        conn.setUUID(uuid)

        p = Packet()
        p.acceptNodeIdentification(packet.getId(), MASTER_NODE_TYPE,
Aurel's avatar
Aurel committed
201
                                   app.uuid, app.server[0], app.server[1],
202
                                   app.num_partitions, app.num_replicas, uuid)
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224
        conn.addPacket(p)
        # Next, the peer should ask a primary master node.
        conn.expectMessage()

    def handleAskPrimaryMaster(self, conn, packet):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        app = self.app

        # Merely tell the peer that I am the primary master node.
        # It is not necessary to send known master nodes, because
        # I must send all node information immediately.
        p = Packet()
        p.answerPrimaryMaster(packet.getId(), app.uuid, [])
        conn.addPacket(p)

        # Send the information.
        node_list = []
        for n in app.nm.getNodeList():
225 226 227 228
            try:
                ip_address, port = n.getServer()
            except TypeError:
                ip_address, port = '0.0.0.0', 0
229 230 231 232 233 234 235 236 237 238 239 240 241 242
            node_list.append((n.getNodeType(), ip_address, port, 
                              n.getUUID() or INVALID_UUID, n.getState()))
            if len(node_list) == 10000:
                # Ugly, but it is necessary to split a packet, if it is too big.
                p = Packet()
                p.notifyNodeInformation(conn.getNextId(), node_list)
                conn.addPacket(p)
                del node_list[:]
        p = Packet()
        p.notifyNodeInformation(conn.getNextId(), node_list)
        conn.addPacket(p)

        # If this is a storage node, send the partition table.
        node = app.nm.getNodeByUUID(uuid)
243
        if node.getNodeType() == STORAGE_NODE_TYPE:
244 245 246 247 248 249
            # Split the packet if too huge.
            p = Packet()
            row_list = []
            for offset in xrange(app.num_partitions):
                row_list.append((offset, app.pt.getRow(offset)))
                if len(row_list) == 1000:
Aurel's avatar
Aurel committed
250
                    p.sendPartitionTable(conn.getNextId(), app.lptid, row_list)
251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
                    conn.addPacket(p)
                    del row_list[:]
            if len(row_list) != 0:
                p.sendPartitionTable(conn.getNextId(), app.lptid, row_list)
                conn.addPacket(p)

    def handleAnnouncePrimaryMaster(self, conn, packet):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        # I am also the primary... So restart the election.
        raise ElectionFailure, 'another primary arises'

    def handleReelectPrimaryMaster(self, conn, packet):
        raise ElectionFailure, 'reelection requested'

    def handleNotifyNodeInformation(self, conn, packet, node_list):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        app = self.app
        for node_type, ip_address, port, uuid, state in node_list:
277
            if node_type == CLIENT_NODE_TYPE:
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331
                # No interest.
                continue
            
            if uuid == INVALID_UUID:
                # No interest.
                continue

            if app.uuid == uuid:
                # This looks like me...
                if state == RUNNING_STATE:
                    # Yes, I know it.
                    continue
                else:
                    # What?! What happened to me?
                    raise RuntimeError, 'I was told that I am bad'

            addr = (ip_address, port)
            node = app.nm.getNodeByUUID(uuid)
            if node is None:
                node = app.nm.getNodeByServer(addr)
                if node is None:
                    # I really don't know such a node. What is this?
                    continue
            else:
                if node.getServer() != addr:
                    # This is different from what I know.
                    continue

            if node.getState() == state:
                # No change. Don't care.
                continue

            if state == RUNNING_STATE:
                # No problem.
                continue

            # Something wrong happened possibly. Cut the connection to this node,
            # if any, and notify the information to others.
            # XXX this can be very slow.
            for c in app.em.getConnectionList():
                if c.getUUID() == uuid:
                    c.close()
            node.setState(state)
            app.broadcastNodeInformation(node)

    def handleAnswerLastIDs(self, conn, packet, loid, ltid, lptid):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        app = self.app

        node = app.nm.getNodeByUUID(uuid)
332
        if node.getNodeType() != STORAGE_NODE_TYPE:
333 334 335 336 337 338 339 340
            self.handleUnexpectedPacket(conn, packet)
            return

        # If I get a bigger value here, it is dangerous.
        if app.loid < loid or app.ltid < ltid or app.lptid < lptid:
            logging.critical('got later information in verification')
            raise VerificationFailure

341
    def handleAnswerPartitionTable(self, conn, packet, ptid, cell_list):
342 343 344 345 346 347 348 349 350 351 352 353
        # Ignore this packet.
        pass

    def handleAnswerUnfinishedTransactions(self, conn, packet, tid_list):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        logging.info('got unfinished transactions %s from %s:%d', 
                tid_list, *(conn.getAddress()))
        app = self.app
354
        node = app.nm.getNodeByUUID(uuid)
355
        if node.getNodeType() != STORAGE_NODE_TYPE:
356 357 358
            self.handleUnexpectedPacket(conn, packet)
            return

359 360 361 362 363 364 365
        if app.asking_uuid_dict.get(uuid, True):
            # No interest.
            return

        app.unfinished_tid_set.update(tid_list)
        app.asking_uuid_dict[uuid] = True

366
    def handleAnswerTransactionInformation(self, conn, packet, tid,
367
                                           user, desc, ext, oid_list):
368 369 370 371 372 373 374 375
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        logging.info('got OIDs %s for %s from %s:%d', 
                oid_list, tid, *(conn.getAddress()))
        app = self.app
376
        node = app.nm.getNodeByUUID(uuid)
377
        if node.getNodeType() != STORAGE_NODE_TYPE:
378 379 380
            self.handleUnexpectedPacket(conn, packet)
            return

381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403
        if app.asking_uuid_dict.get(uuid, True):
            # No interest.
            return

        oid_set = set(oid_list)
        if app.unfinished_oid_set is None:
            # Someone does not agree.
            pass
        elif len(app.unfinished_oid_set) == 0:
            # This is the first answer.
            app.unfinished_oid_set.update(oid_set)
        elif app.unfinished_oid_set != oid_set:
            app.unfinished_oid_set = None
        app.asking_uuid_dict[uuid] = True

    def handleTidNotFound(self, conn, packet, message):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        logging.info('TID not found: %s', message)
        app = self.app
404
        node = app.nm.getNodeByUUID(uuid)
405
        if node.getNodeType() != STORAGE_NODE_TYPE:
406 407 408
            self.handleUnexpectedPacket(conn, packet)
            return

409 410 411 412 413 414 415 416 417 418 419 420 421 422 423
        if app.asking_uuid_dict.get(uuid, True):
            # No interest.
            return

        app.unfinished_oid_set = None
        app.asking_uuid_dict[uuid] = True

    def handleAnswerObjectPresent(self, conn, packet, oid, tid):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        logging.info('object %s:%s found', dump(oid), dump(tid))
        app = self.app
424
        node = app.nm.getNodeByUUID(uuid)
425
        if node.getNodeType() != STORAGE_NODE_TYPE:
426 427 428
            self.handleUnexpectedPacket(conn, packet)
            return

429 430 431 432 433 434 435 436 437 438 439 440 441 442
        if app.asking_uuid_dict.get(uuid, True):
            # No interest.
            return

        app.asking_uuid_dict[uuid] = True

    def handleOidNotFound(self, conn, packet, message):
        uuid = conn.getUUID()
        if uuid is None:
            self.handleUnexpectedPacket(conn, packet)
            return

        logging.info('OID not found: %s', message)
        app = self.app
443
        node = app.nm.getNodeByUUID(uuid)
444
        if node.getNodeType() != STORAGE_NODE_TYPE:
445 446 447
            self.handleUnexpectedPacket(conn, packet)
            return

448 449 450 451 452 453
        if app.asking_uuid_dict.get(uuid, True):
            # No interest.
            return

        app.object_present = False
        app.asking_uuid_dict[uuid] = True