Examples with ExistsRequest org.apache.zookeeper.proto.ExistsRequest used on opensource projects

Example 1 with ExistsRequest

use of org.apache.zookeeper.proto.ExistsRequest in project zookeeper by apache.

the class ZooKeeper method exists.

/**
     * The asynchronous version of exists.
     *
     * @see #exists(String, Watcher)
     */
public void exists(final String path, Watcher watcher, StatCallback cb, Object ctx) {
    final String clientPath = path;
    PathUtils.validatePath(clientPath);
    // the watch contains the un-chroot path
    WatchRegistration wcb = null;
    if (watcher != null) {
        wcb = new ExistsWatchRegistration(watcher, clientPath);
    }
    final String serverPath = prependChroot(clientPath);
    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.exists);
    ExistsRequest request = new ExistsRequest();
    request.setPath(serverPath);
    request.setWatch(watcher != null);
    SetDataResponse response = new SetDataResponse();
    cnxn.queuePacket(h, new ReplyHeader(), request, response, cb, clientPath, serverPath, ctx, wcb);
}

Example 2 with ExistsRequest

use of org.apache.zookeeper.proto.ExistsRequest in project zookeeper by apache.

the class ClientTest method testNonExistingOpCode.

/**
     * We create a perfectly valid 'exists' request, except that the opcode is wrong.
     * @return
     * @throws Exception
     */
@Test
public void testNonExistingOpCode() throws Exception {
    TestableZooKeeper zk = createClient();
    final String path = "/m1";
    RequestHeader h = new RequestHeader();
    // This code does not exists
    h.setType(888);
    ExistsRequest request = new ExistsRequest();
    request.setPath(path);
    request.setWatch(false);
    ExistsResponse response = new ExistsResponse();
    ReplyHeader r = zk.submitRequest(h, request, response, null);
    Assert.assertEquals(r.getErr(), Code.UNIMPLEMENTED.intValue());
    zk.testableWaitForShutdown(CONNECTION_TIMEOUT);
}

Example 3 with ExistsRequest

use of org.apache.zookeeper.proto.ExistsRequest in project zookeeper by apache.

the class FinalRequestProcessor method processRequest.

public void processRequest(Request request) {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Processing request:: " + request);
    }
    // request.addRQRec(">final");
    long traceMask = ZooTrace.CLIENT_REQUEST_TRACE_MASK;
    if (request.type == OpCode.ping) {
        traceMask = ZooTrace.SERVER_PING_TRACE_MASK;
    }
    if (LOG.isTraceEnabled()) {
        ZooTrace.logRequest(LOG, traceMask, 'E', request, "");
    }
    ProcessTxnResult rc = null;
    synchronized (zks.outstandingChanges) {
        // Need to process local session requests
        rc = zks.processTxn(request);
        // that add to outstandingChanges.
        if (request.getHdr() != null) {
            TxnHeader hdr = request.getHdr();
            Record txn = request.getTxn();
            long zxid = hdr.getZxid();
            while (!zks.outstandingChanges.isEmpty() && zks.outstandingChanges.get(0).zxid <= zxid) {
                ChangeRecord cr = zks.outstandingChanges.remove(0);
                if (cr.zxid < zxid) {
                    LOG.warn("Zxid outstanding " + cr.zxid + " is less than current " + zxid);
                }
                if (zks.outstandingChangesForPath.get(cr.path) == cr) {
                    zks.outstandingChangesForPath.remove(cr.path);
                }
            }
        }
        // do not add non quorum packets to the queue.
        if (request.isQuorum()) {
            zks.getZKDatabase().addCommittedProposal(request);
        }
    }
    // Calling closeSession() after losing the cnxn, results in the client close session response being dropped.
    if (request.type == OpCode.closeSession && connClosedByClient(request)) {
        // we are just playing diffs from the leader.
        if (closeSession(zks.serverCnxnFactory, request.sessionId) || closeSession(zks.secureServerCnxnFactory, request.sessionId)) {
            return;
        }
    }
    if (request.cnxn == null) {
        return;
    }
    ServerCnxn cnxn = request.cnxn;
    String lastOp = "NA";
    zks.decInProcess();
    Code err = Code.OK;
    Record rsp = null;
    try {
        if (request.getHdr() != null && request.getHdr().getType() == OpCode.error) {
            /*
                 * When local session upgrading is disabled, leader will
                 * reject the ephemeral node creation due to session expire.
                 * However, if this is the follower that issue the request,
                 * it will have the correct error code, so we should use that
                 * and report to user
                 */
            if (request.getException() != null) {
                throw request.getException();
            } else {
                throw KeeperException.create(KeeperException.Code.get(((ErrorTxn) request.getTxn()).getErr()));
            }
        }
        KeeperException ke = request.getException();
        if (ke != null && request.type != OpCode.multi) {
            throw ke;
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("{}", request);
        }
        switch(request.type) {
            case OpCode.ping:
                {
                    zks.serverStats().updateLatency(request.createTime);
                    lastOp = "PING";
                    cnxn.updateStatsForResponse(request.cxid, request.zxid, lastOp, request.createTime, Time.currentElapsedTime());
                    cnxn.sendResponse(new ReplyHeader(-2, zks.getZKDatabase().getDataTreeLastProcessedZxid(), 0), null, "response");
                    return;
                }
            case OpCode.createSession:
                {
                    zks.serverStats().updateLatency(request.createTime);
                    lastOp = "SESS";
                    cnxn.updateStatsForResponse(request.cxid, request.zxid, lastOp, request.createTime, Time.currentElapsedTime());
                    zks.finishSessionInit(request.cnxn, true);
                    return;
                }
            case OpCode.multi:
                {
                    lastOp = "MULT";
                    rsp = new MultiResponse();
                    for (ProcessTxnResult subTxnResult : rc.multiResult) {
                        OpResult subResult;
                        switch(subTxnResult.type) {
                            case OpCode.check:
                                subResult = new CheckResult();
                                break;
                            case OpCode.create:
                                subResult = new CreateResult(subTxnResult.path);
                                break;
                            case OpCode.create2:
                            case OpCode.createTTL:
                            case OpCode.createContainer:
                                subResult = new CreateResult(subTxnResult.path, subTxnResult.stat);
                                break;
                            case OpCode.delete:
                            case OpCode.deleteContainer:
                                subResult = new DeleteResult();
                                break;
                            case OpCode.setData:
                                subResult = new SetDataResult(subTxnResult.stat);
                                break;
                            case OpCode.error:
                                subResult = new ErrorResult(subTxnResult.err);
                                break;
                            default:
                                throw new IOException("Invalid type of op");
                        }
                        ((MultiResponse) rsp).add(subResult);
                    }
                    break;
                }
            case OpCode.create:
                {
                    lastOp = "CREA";
                    rsp = new CreateResponse(rc.path);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.create2:
            case OpCode.createTTL:
            case OpCode.createContainer:
                {
                    lastOp = "CREA";
                    rsp = new Create2Response(rc.path, rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.delete:
            case OpCode.deleteContainer:
                {
                    lastOp = "DELE";
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.setData:
                {
                    lastOp = "SETD";
                    rsp = new SetDataResponse(rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.reconfig:
                {
                    lastOp = "RECO";
                    rsp = new GetDataResponse(((QuorumZooKeeperServer) zks).self.getQuorumVerifier().toString().getBytes(), rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.setACL:
                {
                    lastOp = "SETA";
                    rsp = new SetACLResponse(rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.closeSession:
                {
                    lastOp = "CLOS";
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.sync:
                {
                    lastOp = "SYNC";
                    SyncRequest syncRequest = new SyncRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, syncRequest);
                    rsp = new SyncResponse(syncRequest.getPath());
                    break;
                }
            case OpCode.check:
                {
                    lastOp = "CHEC";
                    rsp = new SetDataResponse(rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.exists:
                {
                    lastOp = "EXIS";
                    // TODO we need to figure out the security requirement for this!
                    ExistsRequest existsRequest = new ExistsRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, existsRequest);
                    String path = existsRequest.getPath();
                    if (path.indexOf('\0') != -1) {
                        throw new KeeperException.BadArgumentsException();
                    }
                    Stat stat = zks.getZKDatabase().statNode(path, existsRequest.getWatch() ? cnxn : null);
                    rsp = new ExistsResponse(stat);
                    break;
                }
            case OpCode.getData:
                {
                    lastOp = "GETD";
                    GetDataRequest getDataRequest = new GetDataRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getDataRequest);
                    DataNode n = zks.getZKDatabase().getNode(getDataRequest.getPath());
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    PrepRequestProcessor.checkACL(zks, request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.READ, request.authInfo, getDataRequest.getPath(), null);
                    Stat stat = new Stat();
                    byte[] b = zks.getZKDatabase().getData(getDataRequest.getPath(), stat, getDataRequest.getWatch() ? cnxn : null);
                    rsp = new GetDataResponse(b, stat);
                    break;
                }
            case OpCode.setWatches:
                {
                    lastOp = "SETW";
                    SetWatches setWatches = new SetWatches();
                    // XXX We really should NOT need this!!!!
                    request.request.rewind();
                    ByteBufferInputStream.byteBuffer2Record(request.request, setWatches);
                    long relativeZxid = setWatches.getRelativeZxid();
                    zks.getZKDatabase().setWatches(relativeZxid, setWatches.getDataWatches(), setWatches.getExistWatches(), setWatches.getChildWatches(), cnxn);
                    break;
                }
            case OpCode.getACL:
                {
                    lastOp = "GETA";
                    GetACLRequest getACLRequest = new GetACLRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getACLRequest);
                    Stat stat = new Stat();
                    List<ACL> acl = zks.getZKDatabase().getACL(getACLRequest.getPath(), stat);
                    rsp = new GetACLResponse(acl, stat);
                    break;
                }
            case OpCode.getChildren:
                {
                    lastOp = "GETC";
                    GetChildrenRequest getChildrenRequest = new GetChildrenRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getChildrenRequest);
                    DataNode n = zks.getZKDatabase().getNode(getChildrenRequest.getPath());
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    PrepRequestProcessor.checkACL(zks, request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.READ, request.authInfo, getChildrenRequest.getPath(), null);
                    List<String> children = zks.getZKDatabase().getChildren(getChildrenRequest.getPath(), null, getChildrenRequest.getWatch() ? cnxn : null);
                    rsp = new GetChildrenResponse(children);
                    break;
                }
            case OpCode.getChildren2:
                {
                    lastOp = "GETC";
                    GetChildren2Request getChildren2Request = new GetChildren2Request();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getChildren2Request);
                    Stat stat = new Stat();
                    DataNode n = zks.getZKDatabase().getNode(getChildren2Request.getPath());
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    PrepRequestProcessor.checkACL(zks, request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.READ, request.authInfo, getChildren2Request.getPath(), null);
                    List<String> children = zks.getZKDatabase().getChildren(getChildren2Request.getPath(), stat, getChildren2Request.getWatch() ? cnxn : null);
                    rsp = new GetChildren2Response(children, stat);
                    break;
                }
            case OpCode.checkWatches:
                {
                    lastOp = "CHKW";
                    CheckWatchesRequest checkWatches = new CheckWatchesRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, checkWatches);
                    WatcherType type = WatcherType.fromInt(checkWatches.getType());
                    boolean containsWatcher = zks.getZKDatabase().containsWatcher(checkWatches.getPath(), type, cnxn);
                    if (!containsWatcher) {
                        String msg = String.format(Locale.ENGLISH, "%s (type: %s)", new Object[] { checkWatches.getPath(), type });
                        throw new KeeperException.NoWatcherException(msg);
                    }
                    break;
                }
            case OpCode.removeWatches:
                {
                    lastOp = "REMW";
                    RemoveWatchesRequest removeWatches = new RemoveWatchesRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, removeWatches);
                    WatcherType type = WatcherType.fromInt(removeWatches.getType());
                    boolean removed = zks.getZKDatabase().removeWatch(removeWatches.getPath(), type, cnxn);
                    if (!removed) {
                        String msg = String.format(Locale.ENGLISH, "%s (type: %s)", new Object[] { removeWatches.getPath(), type });
                        throw new KeeperException.NoWatcherException(msg);
                    }
                    break;
                }
        }
    } catch (SessionMovedException e) {
        // session moved is a connection level error, we need to tear
        // down the connection otw ZOOKEEPER-710 might happen
        // ie client on slow follower starts to renew session, fails
        // before this completes, then tries the fast follower (leader)
        // and is successful, however the initial renew is then
        // successfully fwd/processed by the leader and as a result
        // the client and leader disagree on where the client is most
        // recently attached (and therefore invalid SESSION MOVED generated)
        cnxn.sendCloseSession();
        return;
    } catch (KeeperException e) {
        err = e.code();
    } catch (Exception e) {
        // log at error level as we are returning a marshalling
        // error to the user
        LOG.error("Failed to process " + request, e);
        StringBuilder sb = new StringBuilder();
        ByteBuffer bb = request.request;
        bb.rewind();
        while (bb.hasRemaining()) {
            sb.append(Integer.toHexString(bb.get() & 0xff));
        }
        LOG.error("Dumping request buffer: 0x" + sb.toString());
        err = Code.MARSHALLINGERROR;
    }
    long lastZxid = zks.getZKDatabase().getDataTreeLastProcessedZxid();
    ReplyHeader hdr = new ReplyHeader(request.cxid, lastZxid, err.intValue());
    zks.serverStats().updateLatency(request.createTime);
    cnxn.updateStatsForResponse(request.cxid, lastZxid, lastOp, request.createTime, Time.currentElapsedTime());
    try {
        cnxn.sendResponse(hdr, rsp, "response");
        if (request.type == OpCode.closeSession) {
            cnxn.sendCloseSession();
        }
    } catch (IOException e) {
        LOG.error("FIXMSG", e);
    }
}

Example 4 with ExistsRequest

use of org.apache.zookeeper.proto.ExistsRequest in project zookeeper by apache.

the class ZooKeeper method exists.

/**
     * Return the stat of the node of the given path. Return null if no such a
     * node exists.
     * <p>
     * If the watch is non-null and the call is successful (no exception is thrown),
     * a watch will be left on the node with the given path. The watch will be
     * triggered by a successful operation that creates/delete the node or sets
     * the data on the node.
     *
     * @param path the node path
     * @param watcher explicit watcher
     * @return the stat of the node of the given path; return null if no such a
     *         node exists.
     * @throws KeeperException If the server signals an error
     * @throws InterruptedException If the server transaction is interrupted.
     * @throws IllegalArgumentException if an invalid path is specified
     */
public Stat exists(final String path, Watcher watcher) throws KeeperException, InterruptedException {
    final String clientPath = path;
    PathUtils.validatePath(clientPath);
    // the watch contains the un-chroot path
    WatchRegistration wcb = null;
    if (watcher != null) {
        wcb = new ExistsWatchRegistration(watcher, clientPath);
    }
    final String serverPath = prependChroot(clientPath);
    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.exists);
    ExistsRequest request = new ExistsRequest();
    request.setPath(serverPath);
    request.setWatch(watcher != null);
    SetDataResponse response = new SetDataResponse();
    ReplyHeader r = cnxn.submitRequest(h, request, response, wcb);
    if (r.getErr() != 0) {
        if (r.getErr() == KeeperException.Code.NONODE.intValue()) {
            return null;
        }
        throw KeeperException.create(KeeperException.Code.get(r.getErr()), clientPath);
    }
    return response.getStat().getCzxid() == -1 ? null : response.getStat();
}