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

Example 1 with AddWatchRequest

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

the class ZooKeeper method addWatch.

/**
 * Add a watch to the given znode using the given mode. Note: not all
 * watch types can be set with this method. Only the modes available
 * in {@link AddWatchMode} can be set with this method.
 *
 * @param basePath the path that the watcher applies to
 * @param watcher the watcher
 * @param mode type of watcher to add
 * @throws InterruptedException If the server transaction is interrupted.
 * @throws KeeperException If the server signals an error with a non-zero
 *  error code.
 * @since 3.6.0
 */
public void addWatch(String basePath, Watcher watcher, AddWatchMode mode) throws KeeperException, InterruptedException {
    PathUtils.validatePath(basePath);
    validateWatcher(watcher);
    String serverPath = prependChroot(basePath);
    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.addWatch);
    AddWatchRequest request = new AddWatchRequest(serverPath, mode.getMode());
    ReplyHeader r = cnxn.submitRequest(h, request, new ErrorResponse(), new AddWatchRegistration(watcher, basePath, mode));
    if (r.getErr() != 0) {
        throw KeeperException.create(KeeperException.Code.get(r.getErr()), basePath);
    }
}

Example 2 with AddWatchRequest

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

the class ZooKeeper method addWatch.

/**
 * Async version of {@link #addWatch(String, Watcher, AddWatchMode)} (see it for details)
 *
 * @param basePath the path that the watcher applies to
 * @param watcher the watcher
 * @param mode type of watcher to add
 * @param cb a handler for the callback
 * @param ctx context to be provided to the callback
 * @throws IllegalArgumentException if an invalid path is specified
 * @since 3.6.0
 */
public void addWatch(String basePath, Watcher watcher, AddWatchMode mode, VoidCallback cb, Object ctx) {
    PathUtils.validatePath(basePath);
    validateWatcher(watcher);
    String serverPath = prependChroot(basePath);
    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.addWatch);
    AddWatchRequest request = new AddWatchRequest(serverPath, mode.getMode());
    cnxn.queuePacket(h, new ReplyHeader(), request, new ErrorResponse(), cb, basePath, serverPath, ctx, new AddWatchRegistration(watcher, basePath, mode));
}

Example 3 with AddWatchRequest

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

the class FinalRequestProcessor method processRequest.

public void processRequest(Request request) {
    LOG.debug("Processing request:: {}", request);
    if (LOG.isTraceEnabled()) {
        long traceMask = ZooTrace.CLIENT_REQUEST_TRACE_MASK;
        if (request.type == OpCode.ping) {
            traceMask = ZooTrace.SERVER_PING_TRACE_MASK;
        }
        ZooTrace.logRequest(LOG, traceMask, 'E', request, "");
    }
    ProcessTxnResult rc = null;
    if (!request.isThrottled()) {
        rc = applyRequest(request);
    }
    if (request.cnxn == null) {
        return;
    }
    ServerCnxn cnxn = request.cnxn;
    long lastZxid = zks.getZKDatabase().getDataTreeLastProcessedZxid();
    String lastOp = "NA";
    // Notify ZooKeeperServer that the request has finished so that it can
    // update any request accounting/throttling limits
    zks.decInProcess();
    zks.requestFinished(request);
    Code err = Code.OK;
    Record rsp = null;
    String path = null;
    int responseSize = 0;
    try {
        if (request.getHdr() != null && request.getHdr().getType() == OpCode.error) {
            AuditHelper.addAuditLog(request, rc, true);
            /*
                 * 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 instanceof SessionMovedException) {
            throw ke;
        }
        if (ke != null && request.type != OpCode.multi) {
            throw ke;
        }
        LOG.debug("{}", request);
        if (request.isStale()) {
            ServerMetrics.getMetrics().STALE_REPLIES.add(1);
        }
        if (request.isThrottled()) {
            throw KeeperException.create(Code.THROTTLEDOP);
        }
        AuditHelper.addAuditLog(request, rc);
        switch(request.type) {
            case OpCode.ping:
                {
                    lastOp = "PING";
                    updateStats(request, lastOp, lastZxid);
                    responseSize = cnxn.sendResponse(new ReplyHeader(ClientCnxn.PING_XID, lastZxid, 0), null, "response");
                    return;
                }
            case OpCode.createSession:
                {
                    lastOp = "SESS";
                    updateStats(request, lastOp, lastZxid);
                    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);
                                if (subTxnResult.err == Code.SESSIONMOVED.intValue()) {
                                    throw new SessionMovedException();
                                }
                                break;
                            default:
                                throw new IOException("Invalid type of op");
                        }
                        ((MultiResponse) rsp).add(subResult);
                    }
                    break;
                }
            case OpCode.multiRead:
                {
                    lastOp = "MLTR";
                    MultiOperationRecord multiReadRecord = new MultiOperationRecord();
                    ByteBufferInputStream.byteBuffer2Record(request.request, multiReadRecord);
                    rsp = new MultiResponse();
                    OpResult subResult;
                    for (Op readOp : multiReadRecord) {
                        try {
                            Record rec;
                            switch(readOp.getType()) {
                                case OpCode.getChildren:
                                    rec = handleGetChildrenRequest(readOp.toRequestRecord(), cnxn, request.authInfo);
                                    subResult = new GetChildrenResult(((GetChildrenResponse) rec).getChildren());
                                    break;
                                case OpCode.getData:
                                    rec = handleGetDataRequest(readOp.toRequestRecord(), cnxn, request.authInfo);
                                    GetDataResponse gdr = (GetDataResponse) rec;
                                    subResult = new GetDataResult(gdr.getData(), gdr.getStat());
                                    break;
                                default:
                                    throw new IOException("Invalid type of readOp");
                            }
                        } catch (KeeperException e) {
                            subResult = new ErrorResult(e.code().intValue());
                        }
                        ((MultiResponse) rsp).add(subResult);
                    }
                    break;
                }
            case OpCode.create:
                {
                    lastOp = "CREA";
                    rsp = new CreateResponse(rc.path);
                    err = Code.get(rc.err);
                    requestPathMetricsCollector.registerRequest(request.type, rc.path);
                    break;
                }
            case OpCode.create2:
            case OpCode.createTTL:
            case OpCode.createContainer:
                {
                    lastOp = "CREA";
                    rsp = new Create2Response(rc.path, rc.stat);
                    err = Code.get(rc.err);
                    requestPathMetricsCollector.registerRequest(request.type, rc.path);
                    break;
                }
            case OpCode.delete:
            case OpCode.deleteContainer:
                {
                    lastOp = "DELE";
                    err = Code.get(rc.err);
                    requestPathMetricsCollector.registerRequest(request.type, rc.path);
                    break;
                }
            case OpCode.setData:
                {
                    lastOp = "SETD";
                    rsp = new SetDataResponse(rc.stat);
                    err = Code.get(rc.err);
                    requestPathMetricsCollector.registerRequest(request.type, rc.path);
                    break;
                }
            case OpCode.reconfig:
                {
                    lastOp = "RECO";
                    rsp = new GetDataResponse(((QuorumZooKeeperServer) zks).self.getQuorumVerifier().toString().getBytes(UTF_8), rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.setACL:
                {
                    lastOp = "SETA";
                    rsp = new SetACLResponse(rc.stat);
                    err = Code.get(rc.err);
                    requestPathMetricsCollector.registerRequest(request.type, rc.path);
                    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());
                    requestPathMetricsCollector.registerRequest(request.type, 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);
                    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);
                    requestPathMetricsCollector.registerRequest(request.type, path);
                    break;
                }
            case OpCode.getData:
                {
                    lastOp = "GETD";
                    GetDataRequest getDataRequest = new GetDataRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getDataRequest);
                    path = getDataRequest.getPath();
                    rsp = handleGetDataRequest(getDataRequest, cnxn, request.authInfo);
                    requestPathMetricsCollector.registerRequest(request.type, path);
                    break;
                }
            case OpCode.setWatches:
                {
                    lastOp = "SETW";
                    SetWatches setWatches = new SetWatches();
                    // TODO 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(), Collections.emptyList(), Collections.emptyList(), cnxn);
                    break;
                }
            case OpCode.setWatches2:
                {
                    lastOp = "STW2";
                    SetWatches2 setWatches = new SetWatches2();
                    // TODO 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(), setWatches.getPersistentWatches(), setWatches.getPersistentRecursiveWatches(), cnxn);
                    break;
                }
            case OpCode.addWatch:
                {
                    lastOp = "ADDW";
                    AddWatchRequest addWatcherRequest = new AddWatchRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, addWatcherRequest);
                    zks.getZKDatabase().addWatch(addWatcherRequest.getPath(), cnxn, addWatcherRequest.getMode());
                    rsp = new ErrorResponse(0);
                    break;
                }
            case OpCode.getACL:
                {
                    lastOp = "GETA";
                    GetACLRequest getACLRequest = new GetACLRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getACLRequest);
                    path = getACLRequest.getPath();
                    DataNode n = zks.getZKDatabase().getNode(path);
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    zks.checkACL(request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.READ | ZooDefs.Perms.ADMIN, request.authInfo, path, null);
                    Stat stat = new Stat();
                    List<ACL> acl = zks.getZKDatabase().getACL(path, stat);
                    requestPathMetricsCollector.registerRequest(request.type, getACLRequest.getPath());
                    try {
                        zks.checkACL(request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.ADMIN, request.authInfo, path, null);
                        rsp = new GetACLResponse(acl, stat);
                    } catch (KeeperException.NoAuthException e) {
                        List<ACL> acl1 = new ArrayList<ACL>(acl.size());
                        for (ACL a : acl) {
                            if ("digest".equals(a.getId().getScheme())) {
                                Id id = a.getId();
                                Id id1 = new Id(id.getScheme(), id.getId().replaceAll(":.*", ":x"));
                                acl1.add(new ACL(a.getPerms(), id1));
                            } else {
                                acl1.add(a);
                            }
                        }
                        rsp = new GetACLResponse(acl1, stat);
                    }
                    break;
                }
            case OpCode.getChildren:
                {
                    lastOp = "GETC";
                    GetChildrenRequest getChildrenRequest = new GetChildrenRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getChildrenRequest);
                    path = getChildrenRequest.getPath();
                    rsp = handleGetChildrenRequest(getChildrenRequest, cnxn, request.authInfo);
                    requestPathMetricsCollector.registerRequest(request.type, path);
                    break;
                }
            case OpCode.getAllChildrenNumber:
                {
                    lastOp = "GETACN";
                    GetAllChildrenNumberRequest getAllChildrenNumberRequest = new GetAllChildrenNumberRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getAllChildrenNumberRequest);
                    path = getAllChildrenNumberRequest.getPath();
                    DataNode n = zks.getZKDatabase().getNode(path);
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    zks.checkACL(request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.READ, request.authInfo, path, null);
                    int number = zks.getZKDatabase().getAllChildrenNumber(path);
                    rsp = new GetAllChildrenNumberResponse(number);
                    break;
                }
            case OpCode.getChildren2:
                {
                    lastOp = "GETC";
                    GetChildren2Request getChildren2Request = new GetChildren2Request();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getChildren2Request);
                    Stat stat = new Stat();
                    path = getChildren2Request.getPath();
                    DataNode n = zks.getZKDatabase().getNode(path);
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    zks.checkACL(request.cnxn, zks.getZKDatabase().aclForNode(n), ZooDefs.Perms.READ, request.authInfo, path, null);
                    List<String> children = zks.getZKDatabase().getChildren(path, stat, getChildren2Request.getWatch() ? cnxn : null);
                    rsp = new GetChildren2Response(children, stat);
                    requestPathMetricsCollector.registerRequest(request.type, path);
                    break;
                }
            case OpCode.checkWatches:
                {
                    lastOp = "CHKW";
                    CheckWatchesRequest checkWatches = new CheckWatchesRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, checkWatches);
                    WatcherType type = WatcherType.fromInt(checkWatches.getType());
                    path = checkWatches.getPath();
                    boolean containsWatcher = zks.getZKDatabase().containsWatcher(path, type, cnxn);
                    if (!containsWatcher) {
                        String msg = String.format(Locale.ENGLISH, "%s (type: %s)", path, type);
                        throw new KeeperException.NoWatcherException(msg);
                    }
                    requestPathMetricsCollector.registerRequest(request.type, checkWatches.getPath());
                    break;
                }
            case OpCode.removeWatches:
                {
                    lastOp = "REMW";
                    RemoveWatchesRequest removeWatches = new RemoveWatchesRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, removeWatches);
                    WatcherType type = WatcherType.fromInt(removeWatches.getType());
                    path = removeWatches.getPath();
                    boolean removed = zks.getZKDatabase().removeWatch(path, type, cnxn);
                    if (!removed) {
                        String msg = String.format(Locale.ENGLISH, "%s (type: %s)", path, type);
                        throw new KeeperException.NoWatcherException(msg);
                    }
                    requestPathMetricsCollector.registerRequest(request.type, removeWatches.getPath());
                    break;
                }
            case OpCode.whoAmI:
                {
                    lastOp = "HOMI";
                    rsp = new WhoAmIResponse(AuthUtil.getClientInfos(request.authInfo));
                    break;
                }
            case OpCode.getEphemerals:
                {
                    lastOp = "GETE";
                    GetEphemeralsRequest getEphemerals = new GetEphemeralsRequest();
                    ByteBufferInputStream.byteBuffer2Record(request.request, getEphemerals);
                    String prefixPath = getEphemerals.getPrefixPath();
                    Set<String> allEphems = zks.getZKDatabase().getDataTree().getEphemerals(request.sessionId);
                    List<String> ephemerals = new ArrayList<>();
                    if (prefixPath == null || prefixPath.trim().isEmpty() || "/".equals(prefixPath.trim())) {
                        ephemerals.addAll(allEphems);
                    } else {
                        for (String p : allEphems) {
                            if (p.startsWith(prefixPath)) {
                                ephemerals.add(p);
                            }
                        }
                    }
                    rsp = new GetEphemeralsResponse(ephemerals);
                    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(String.format("%02x", (0xff & bb.get())));
        }
        LOG.error("Dumping request buffer for request type {}: 0x{}", Request.op2String(request.type), sb);
        err = Code.MARSHALLINGERROR;
    }
    ReplyHeader hdr = new ReplyHeader(request.cxid, lastZxid, err.intValue());
    updateStats(request, lastOp, lastZxid);
    try {
        if (path == null || rsp == null) {
            responseSize = cnxn.sendResponse(hdr, rsp, "response");
        } else {
            int opCode = request.type;
            Stat stat = null;
            // so these values are passed along with the response.
            switch(opCode) {
                case OpCode.getData:
                    {
                        GetDataResponse getDataResponse = (GetDataResponse) rsp;
                        stat = getDataResponse.getStat();
                        responseSize = cnxn.sendResponse(hdr, rsp, "response", path, stat, opCode);
                        break;
                    }
                case OpCode.getChildren2:
                    {
                        GetChildren2Response getChildren2Response = (GetChildren2Response) rsp;
                        stat = getChildren2Response.getStat();
                        responseSize = cnxn.sendResponse(hdr, rsp, "response", path, stat, opCode);
                        break;
                    }
                default:
                    responseSize = cnxn.sendResponse(hdr, rsp, "response");
            }
        }
        if (request.type == OpCode.closeSession) {
            cnxn.sendCloseSession();
        }
    } catch (IOException e) {
        LOG.error("FIXMSG", e);
    } finally {
        ServerMetrics.getMetrics().RESPONSE_BYTES.add(responseSize);
    }
}