Examples with ResultValue edu.umass.cs.gnsserver.utils.ResultValue used on opensource projects

Example 6 with ResultValue

use of edu.umass.cs.gnsserver.utils.ResultValue in project GNS by MobilityFirst.

the class Select method handledAllServersResponded.

// If all the servers have sent us a response we're done.
private static void handledAllServersResponded(InternalRequestHeader header, SelectResponsePacket packet, NSSelectInfo info, GNSApplicationInterface<String> replica) throws JSONException, ClientException, IOException, InternalRequestException {
    // must be done before the notify below
    // we're done processing this select query
    QUERIES_IN_PROGRESS.remove(packet.getNsQueryId());
    Set<JSONObject> allRecords = info.getResponsesAsSet();
    // Todo - clean up this use of guids further below in the group code
    Set<String> guids = extractGuidsFromRecords(allRecords);
    LOGGER.log(Level.FINE, "NS{0} guids:{1}", new Object[] { replica.getNodeID(), guids });
    SelectResponsePacket response;
    // If projection is null we return guids (old-style).
    if (info.getProjection() == null) {
        response = SelectResponsePacket.makeSuccessPacketForGuidsOnly(packet.getId(), null, -1, null, new JSONArray(guids));
    // Otherwise we return a list of records.
    } else {
        List<JSONObject> records = filterAndMassageRecords(allRecords);
        LOGGER.log(Level.FINE, "NS{0} record:{1}", new Object[] { replica.getNodeID(), records });
        response = SelectResponsePacket.makeSuccessPacketForFullRecords(packet.getId(), null, -1, -1, null, new JSONArray(records));
    }
    // Put the result where the coordinator can see it.
    QUERY_RESULT.put(packet.getNsQueryId(), response);
    // and let the coordinator know the value is there
    if (GNSApp.DELEGATE_CLIENT_MESSAGING) {
        synchronized (QUERIES_IN_PROGRESS) {
            QUERIES_IN_PROGRESS.notify();
        }
    }
    // Now we update any group guid stuff
    if (info.getGroupBehavior().equals(SelectGroupBehavior.GROUP_SETUP)) {
        LOGGER.log(Level.FINE, "NS{0} storing query string and other info", replica.getNodeID());
        // for setup we need to squirrel away the query for later lookups
        NSGroupAccess.updateQueryString(header, info.getGuid(), info.getQuery(), info.getProjection(), replica.getRequestHandler());
        NSGroupAccess.updateMinRefresh(header, info.getGuid(), info.getMinRefreshInterval(), replica.getRequestHandler());
    }
    if (info.getGroupBehavior().equals(SelectGroupBehavior.GROUP_SETUP) || info.getGroupBehavior().equals(SelectGroupBehavior.GROUP_LOOKUP)) {
        String guid = info.getGuid();
        LOGGER.log(Level.FINE, "NS{0} updating group members", replica.getNodeID());
        GroupAccess.addToGroup(header, guid, new ResultValue(guids), null, null, null, null, replica.getRequestHandler());
        //NSGroupAccess.updateMembers(header, guid, guids, replica.getRequestHandler());
        //NSGroupAccess.updateRecords(guid, processResponsesIntoJSONArray(info.getResponsesAsMap()), replica); 
        NSGroupAccess.updateLastUpdate(header, guid, new Date(), replica.getRequestHandler());
    }
}

Example 7 with ResultValue

use of edu.umass.cs.gnsserver.utils.ResultValue in project GNS by MobilityFirst.

the class Select method handleSelectRequestFromClient.

/**
   * Handle a select request from a client.
   * This node is the broadcaster and selector.
   *
   * @param header
   * @param packet
   * @param app
   * @return a select response packet
   * @throws JSONException
   * @throws UnknownHostException
   * @throws FailedDBOperationException
   * @throws InternalRequestException
   */
@SuppressWarnings("unchecked")
public static SelectResponsePacket handleSelectRequestFromClient(InternalRequestHeader header, SelectRequestPacket packet, GNSApplicationInterface<String> app) throws JSONException, UnknownHostException, FailedDBOperationException, InternalRequestException {
    // If sufficient time hasn't passed we just send the current value back
    if (packet.getGroupBehavior().equals(SelectGroupBehavior.GROUP_LOOKUP)) {
        // grab the timing parameters that we squirreled away from the SETUP
        Date lastUpdate = NSGroupAccess.getLastUpdate(header, packet.getGuid(), app.getRequestHandler());
        int minRefreshInterval = NSGroupAccess.getMinRefresh(header, packet.getGuid(), app.getRequestHandler());
        if (lastUpdate != null) {
            LOGGER.log(Level.FINE, "GROUP_LOOKUP Request: {0} - {1} <= {2}", new Object[] { new Date().getTime(), lastUpdate.getTime(), minRefreshInterval });
            // if not enough time has passed we just return the current value of the group
            if (new Date().getTime() - lastUpdate.getTime() <= minRefreshInterval) {
                LOGGER.log(Level.FINE, "GROUP_LOOKUP Request: Time has not elapsed. Returning current group value for {0}", packet.getGuid());
                ResultValue result = NSGroupAccess.lookupMembers(header, packet.getGuid(), true, app.getRequestHandler());
                return SelectResponsePacket.makeSuccessPacketForGuidsOnly(packet.getId(), null, -1, null, new JSONArray(result.toStringSet()));
            }
        } else {
            LOGGER.fine("GROUP_LOOKUP Request: No Last Update Info ");
        }
    }
    // the code below executes for regular selects and also for GROUP SETUP and GROUP LOOKUP but for lookup
    // only if enough time has elapsed since last lookup (see above)
    // OR in the anamolous situation where the update info could not be found
    LOGGER.fine(packet.getSelectOperation().toString() + " Request: Forwarding request for " + packet.getGuid() != null ? packet.getGuid() : "non-guid select");
    // If it's not a group lookup or is but enough time has passed we do the usual thing
    // and send the request out to all the servers. We'll receive a response sent on the flipside.
    Set<InetSocketAddress> serverAddresses = new HashSet<>(PaxosConfig.getActives().values());
    //Set<String> serverIds = app.getGNSNodeConfig().getActiveReplicas();
    // store the info for later
    int queryId = addQueryInfo(serverAddresses, packet.getSelectOperation(), packet.getGroupBehavior(), packet.getQuery(), packet.getProjection(), packet.getMinRefreshInterval(), packet.getGuid());
    if (packet.getGroupBehavior().equals(SelectGroupBehavior.GROUP_LOOKUP)) {
        // the query string is supplied with a lookup so we stuff in it there. It was saved from the SETUP operation.
        packet.setQuery(NSGroupAccess.getQueryString(header, packet.getGuid(), app.getRequestHandler()));
        packet.setProjection(NSGroupAccess.getProjection(header, packet.getGuid(), app.getRequestHandler()));
    }
    InetSocketAddress returnAddress = new InetSocketAddress(app.getNodeAddress().getAddress(), ReconfigurationConfig.getClientFacingPort(app.getNodeAddress().getPort()));
    packet.setNSReturnAddress(returnAddress);
    //packet.setNameServerID(app.getNodeID());
    // Note: this also tells handleSelectRequest that it should go to NS now
    packet.setNsQueryId(queryId);
    JSONObject outgoingJSON = packet.toJSONObject();
    try {
        LOGGER.log(Level.FINER, "addresses: {0} node address: {1}", new Object[] { serverAddresses, app.getNodeAddress() });
        // Forward to all but self because...
        for (InetSocketAddress address : serverAddresses) {
            if (!address.equals(app.getNodeAddress())) {
                InetSocketAddress offsetAddress = new InetSocketAddress(address.getAddress(), ReconfigurationConfig.getClientFacingPort(address.getPort()));
                LOGGER.log(Level.INFO, "NS {0} sending select {1} to {2} ({3})", new Object[] { app.getNodeID(), outgoingJSON, offsetAddress, address });
                app.sendToAddress(offsetAddress, outgoingJSON);
            }
        }
        // we handle our self by locally getting self-select records
        handleSelectResponse(getMySelectedRecords(packet, app), app);
        // Wait for responses, otherwise you are violating Replicable.execute(.)'s semantics.
        synchronized (QUERIES_IN_PROGRESS) {
            while (QUERIES_IN_PROGRESS.containsKey(queryId)) {
                try {
                    QUERIES_IN_PROGRESS.wait(SELECT_REQUEST_TIMEOUT);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        if (QUERY_RESULT.containsKey(queryId)) {
            return QUERY_RESULT.remove(queryId);
        }
    } catch (IOException | ClientException e) {
        LOGGER.log(Level.SEVERE, "Exception while sending select request: {0}", e);
    }
    return null;
}

Example 8 with ResultValue

use of edu.umass.cs.gnsserver.utils.ResultValue in project GNS by MobilityFirst.

the class RemoveMembersFromGroup method execute.

@Override
public CommandResponse execute(InternalRequestHeader header, CommandPacket commandPacket, ClientRequestHandlerInterface handler) throws InvalidKeyException, InvalidKeySpecException, JSONException, NoSuchAlgorithmException, SignatureException, ParseException {
    JSONObject json = commandPacket.getCommand();
    String guid = json.getString(GNSProtocol.GUID.toString());
    String members = json.getString(GNSProtocol.MEMBERS.toString());
    // writer might be same as guid
    String writer = json.optString(GNSProtocol.WRITER.toString(), guid);
    // signature and message can be empty for unsigned cases
    String signature = json.optString(GNSProtocol.SIGNATURE.toString(), null);
    String message = json.optString(GNSProtocol.SIGNATUREFULLMESSAGE.toString(), null);
    Date timestamp = json.has(GNSProtocol.TIMESTAMP.toString()) ? Format.parseDateISO8601UTC(json.getString(GNSProtocol.TIMESTAMP.toString())) : // can be null on older client
    null;
    ResponseCode responseCode;
    try {
        if (!(responseCode = GroupAccess.removeFromGroup(header, commandPacket, guid, new ResultValue(members), writer, signature, message, timestamp, handler)).isExceptionOrError()) {
            return new CommandResponse(ResponseCode.NO_ERROR, GNSProtocol.OK_RESPONSE.toString());
        } else {
            return new CommandResponse(responseCode, GNSProtocol.BAD_RESPONSE.toString() + " " + responseCode.getProtocolCode());
        }
    } catch (ClientException | IOException | InternalRequestException e) {
        return new CommandResponse(ResponseCode.UNSPECIFIED_ERROR, GNSProtocol.BAD_RESPONSE.toString() + " " + GNSProtocol.UNSPECIFIED_ERROR.toString() + " " + e.getMessage());
    }
}

Example 9 with ResultValue

use of edu.umass.cs.gnsserver.utils.ResultValue in project GNS by MobilityFirst.

the class NSFieldAccess method lookupListFieldAnywhere.

/**
   * Looks up the value of an old-style list field in the guid.
   * If allowQueryToOtherNSs is true and guid doesn't exists on this Name Server,
   * sends a read query from this Name Server to a Local Name Server.
   * Returns the value of a field in a GNSProtocol.GUID.toString() as a ResultValue.
   *
   * @param guid
   * @param field
   * @param allowRemoteLookup
   * @param handler
   * @return ResultValue containing the value of the field or an empty ResultValue if field cannot be found
   * @throws edu.umass.cs.gnscommon.exceptions.server.FailedDBOperationException
   */
public static ResultValue lookupListFieldAnywhere(InternalRequestHeader header, String guid, String field, boolean allowRemoteLookup, ClientRequestHandlerInterface handler) throws FailedDBOperationException {
    ResultValue result = lookupListFieldLocallySafe(guid, field, handler.getApp().getDB());
    // and we're allowed then send a query to another server
    if (result.isEmpty() && !handler.getApp().getDB().containsName(guid) && allowRemoteLookup) {
        try {
            String stringResult = handler.getInternalClient().execute(GNSCommandInternal.fieldRead(guid, field, header)).getResultString();
            result = new ResultValue(stringResult);
        } catch (Exception e) {
            ClientSupportConfig.getLogger().log(Level.SEVERE, "Problem getting record from remote server: {0}", e);
        }
        if (!result.isEmpty()) {
            ClientSupportConfig.getLogger().log(Level.FINE, "@@@@@@ Field {0} in {1}" + " not found on this server but was found thru remote query. " + "Returning {2}", new Object[] { field, guid, result.toString() });
        }
    }
    return result;
}

Example 10 with ResultValue

use of edu.umass.cs.gnsserver.utils.ResultValue in project GNS by MobilityFirst.

the class AddMembersToGroup method execute.

@Override
public CommandResponse execute(InternalRequestHeader header, CommandPacket commandPacket, ClientRequestHandlerInterface handler) throws InvalidKeyException, InvalidKeySpecException, JSONException, NoSuchAlgorithmException, SignatureException, ParseException {
    JSONObject json = commandPacket.getCommand();
    String guid = json.getString(GNSProtocol.GUID.toString());
    String members = json.getString(GNSProtocol.MEMBERS.toString());
    // writer might be same as guid
    String writer = json.optString(GNSProtocol.WRITER.toString(), guid);
    // signature and message can be empty for unsigned cases
    String signature = json.optString(GNSProtocol.SIGNATURE.toString(), null);
    String message = json.optString(GNSProtocol.SIGNATUREFULLMESSAGE.toString(), null);
    Date timestamp = json.has(GNSProtocol.TIMESTAMP.toString()) ? Format.parseDateISO8601UTC(json.getString(GNSProtocol.TIMESTAMP.toString())) : // can be null on older client
    null;
    ResponseCode responseCode;
    try {
        if (!(responseCode = GroupAccess.addToGroup(header, guid, new ResultValue(members), writer, signature, message, timestamp, handler)).isExceptionOrError()) {
            return new CommandResponse(ResponseCode.NO_ERROR, GNSProtocol.OK_RESPONSE.toString());
        } else {
            return new CommandResponse(responseCode, GNSProtocol.BAD_RESPONSE.toString() + " " + responseCode.getProtocolCode());
        }
    } catch (ClientException | IOException | InternalRequestException e) {
        return new CommandResponse(ResponseCode.UNSPECIFIED_ERROR, GNSProtocol.BAD_RESPONSE.toString() + " " + GNSProtocol.UNSPECIFIED_ERROR.toString() + " " + e.getMessage());
    }
}