/**
* Convert Iterable of {@link ZKOp} we got into the ZooKeeper.Op instances to actually pass to
* multi (need to do this in order to appendMetaData).
*/
private Iterable<Op> prepareZKMulti(Iterable<Op> ops) throws UnsupportedOperationException {
if (ops == null) return null;
List<Op> preparedOps = new LinkedList<Op>();
for (Op op : ops) {
if (op.getType() == ZooDefs.OpCode.create) {
CreateRequest create = (CreateRequest) op.toRequestRecord();
preparedOps.add(
Op.create(
create.getPath(),
appendMetaData(create.getData()),
create.getAcl(),
create.getFlags()));
} else if (op.getType() == ZooDefs.OpCode.delete) {
// no need to appendMetaData for delete
preparedOps.add(op);
} else if (op.getType() == ZooDefs.OpCode.setData) {
SetDataRequest setData = (SetDataRequest) op.toRequestRecord();
preparedOps.add(
Op.setData(setData.getPath(), appendMetaData(setData.getData()), setData.getVersion()));
} else {
throw new UnsupportedOperationException("Unexpected ZKOp type: " + op.getClass().getName());
}
}
return preparedOps;
}
/**
* This method will be called inside the ProcessRequestThread, which is a singleton, so there will
* be a single thread calling this code.
*
* @param request
*/
@SuppressWarnings("unchecked")
protected void pRequest(Request request) throws RequestProcessorException {
// LOG.info("Prep>>> cxid = " + request.cxid + " type = " +
// request.type + " id = 0x" + Long.toHexString(request.sessionId));
TxnHeader txnHeader = null;
Record txn = null;
try {
switch (request.type) {
case OpCode.create:
txnHeader =
new TxnHeader(
request.sessionId, request.cxid, zks.getNextZxid(), zks.getTime(), OpCode.create);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
CreateRequest createRequest = new CreateRequest();
ZooKeeperServer.byteBuffer2Record(request.request, createRequest);
String path = createRequest.getPath();
int lastSlash = path.lastIndexOf('/');
if (lastSlash == -1 || path.indexOf('\0') != -1 || failCreate) {
LOG.info(
"Invalid path " + path + " with session 0x" + Long.toHexString(request.sessionId));
throw new KeeperException.BadArgumentsException(path);
}
if (!fixupACL(request.authInfo, createRequest.getAcl())) {
throw new KeeperException.InvalidACLException(path);
}
String parentPath = path.substring(0, lastSlash);
ChangeRecord parentRecord = getRecordForPath(parentPath);
checkACL(zks, parentRecord.acl, ZooDefs.Perms.CREATE, request.authInfo);
int parentCVersion = parentRecord.stat.getCversion();
CreateMode createMode = CreateMode.fromFlag(createRequest.getFlags());
if (createMode.isSequential()) {
path = path + String.format(Locale.ENGLISH, "%010d", parentCVersion);
}
try {
PathUtils.validatePath(path);
} catch (IllegalArgumentException ie) {
LOG.info(
"Invalid path " + path + " with session 0x" + Long.toHexString(request.sessionId));
throw new KeeperException.BadArgumentsException(path);
}
try {
if (getRecordForPath(path) != null) {
throw new KeeperException.NodeExistsException(path);
}
} catch (KeeperException.NoNodeException e) {
// ignore this one
}
boolean ephemeralParent = parentRecord.stat.getEphemeralOwner() != 0;
if (ephemeralParent) {
throw new KeeperException.NoChildrenForEphemeralsException(path);
}
txn =
new CreateTxn(
path, createRequest.getData(), createRequest.getAcl(), createMode.isEphemeral());
StatPersisted s = new StatPersisted();
if (createMode.isEphemeral()) {
s.setEphemeralOwner(request.sessionId);
}
parentRecord = parentRecord.duplicate(txnHeader.getZxid());
parentRecord.childCount++;
parentRecord.stat.setCversion(parentRecord.stat.getCversion() + 1);
addChangeRecord(parentRecord);
addChangeRecord(
new ChangeRecord(txnHeader.getZxid(), path, s, 0, createRequest.getAcl()));
break;
case OpCode.delete:
txnHeader =
new TxnHeader(
request.sessionId, request.cxid, zks.getNextZxid(), zks.getTime(), OpCode.delete);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
DeleteRequest deleteRequest = new DeleteRequest();
ZooKeeperServer.byteBuffer2Record(request.request, deleteRequest);
path = deleteRequest.getPath();
lastSlash = path.lastIndexOf('/');
if (lastSlash == -1
|| path.indexOf('\0') != -1
|| zks.getZKDatabase().isSpecialPath(path)) {
throw new KeeperException.BadArgumentsException(path);
}
parentPath = path.substring(0, lastSlash);
parentRecord = getRecordForPath(parentPath);
ChangeRecord nodeRecord = getRecordForPath(path);
checkACL(zks, parentRecord.acl, ZooDefs.Perms.DELETE, request.authInfo);
int version = deleteRequest.getVersion();
if (version != -1 && nodeRecord.stat.getVersion() != version) {
throw new KeeperException.BadVersionException(path);
}
if (nodeRecord.childCount > 0) {
throw new KeeperException.NotEmptyException(path);
}
txn = new DeleteTxn(path);
parentRecord = parentRecord.duplicate(txnHeader.getZxid());
parentRecord.childCount--;
parentRecord.stat.setCversion(parentRecord.stat.getCversion() + 1);
addChangeRecord(parentRecord);
addChangeRecord(new ChangeRecord(txnHeader.getZxid(), path, null, -1, null));
break;
case OpCode.setData:
txnHeader =
new TxnHeader(
request.sessionId,
request.cxid,
zks.getNextZxid(),
zks.getTime(),
OpCode.setData);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
SetDataRequest setDataRequest = new SetDataRequest();
ZooKeeperServer.byteBuffer2Record(request.request, setDataRequest);
path = setDataRequest.getPath();
nodeRecord = getRecordForPath(path);
checkACL(zks, nodeRecord.acl, ZooDefs.Perms.WRITE, request.authInfo);
version = setDataRequest.getVersion();
int currentVersion = nodeRecord.stat.getVersion();
if (version != -1 && version != currentVersion) {
throw new KeeperException.BadVersionException(path);
}
version = currentVersion + 1;
txn = new SetDataTxn(path, setDataRequest.getData(), version);
nodeRecord = nodeRecord.duplicate(txnHeader.getZxid());
nodeRecord.stat.setVersion(version);
addChangeRecord(nodeRecord);
break;
case OpCode.setACL:
txnHeader =
new TxnHeader(
request.sessionId, request.cxid, zks.getNextZxid(), zks.getTime(), OpCode.setACL);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
SetACLRequest setAclRequest = new SetACLRequest();
ZooKeeperServer.byteBuffer2Record(request.request, setAclRequest);
path = setAclRequest.getPath();
if (!fixupACL(request.authInfo, setAclRequest.getAcl())) {
throw new KeeperException.InvalidACLException(path);
}
nodeRecord = getRecordForPath(path);
checkACL(zks, nodeRecord.acl, ZooDefs.Perms.ADMIN, request.authInfo);
version = setAclRequest.getVersion();
currentVersion = nodeRecord.stat.getAversion();
if (version != -1 && version != currentVersion) {
throw new KeeperException.BadVersionException(path);
}
version = currentVersion + 1;
txn = new SetACLTxn(path, setAclRequest.getAcl(), version);
nodeRecord = nodeRecord.duplicate(txnHeader.getZxid());
nodeRecord.stat.setAversion(version);
addChangeRecord(nodeRecord);
break;
case OpCode.createSession:
txnHeader =
new TxnHeader(
request.sessionId,
request.cxid,
zks.getNextZxid(),
zks.getTime(),
OpCode.createSession);
request.request.rewind();
int to = request.request.getInt();
txn = new CreateSessionTxn(to);
request.request.rewind();
zks.sessionTracker.addSession(request.sessionId, to);
zks.setOwner(request.sessionId, request.getOwner());
break;
case OpCode.closeSession:
txnHeader =
new TxnHeader(
request.sessionId,
request.cxid,
zks.getNextZxid(),
zks.getTime(),
OpCode.closeSession);
// We don't want to do this check since the session expiration thread
// queues up this operation without being the session owner.
// this request is the last of the session so it should be ok
// zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
HashSet<String> es = zks.getZKDatabase().getEphemerals(request.sessionId);
synchronized (zks.outstandingChanges) {
for (ChangeRecord c : zks.outstandingChanges) {
if (c.stat == null) {
// Doing a delete
es.remove(c.path);
} else if (c.stat.getEphemeralOwner() == request.sessionId) {
es.add(c.path);
}
}
for (String path2Delete : es) {
addChangeRecord(new ChangeRecord(txnHeader.getZxid(), path2Delete, null, 0, null));
}
zks.sessionTracker.setSessionClosing(request.sessionId);
}
LOG.info(
"Processed session termination for sessionid: 0x"
+ Long.toHexString(request.sessionId));
break;
case OpCode.sync:
case OpCode.exists:
case OpCode.getData:
case OpCode.getACL:
case OpCode.getChildren:
case OpCode.getChildren2:
case OpCode.ping:
case OpCode.setWatches:
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
break;
}
} catch (KeeperException e) {
if (txnHeader != null) {
txnHeader.setType(OpCode.error);
txn = new ErrorTxn(e.code().intValue());
}
LOG.info(
"Got user-level KeeperException when processing "
+ request.toString()
+ " Error Path:"
+ e.getPath()
+ " Error:"
+ e.getMessage());
request.setException(e);
} 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;
if (bb != null) {
bb.rewind();
while (bb.hasRemaining()) {
sb.append(Integer.toHexString(bb.get() & 0xff));
}
} else {
sb.append("request buffer is null");
}
LOG.error("Dumping request buffer: 0x" + sb.toString());
if (txnHeader != null) {
txnHeader.setType(OpCode.error);
txn = new ErrorTxn(Code.MARSHALLINGERROR.intValue());
}
}
request.hdr = txnHeader;
request.txn = txn;
request.zxid = zks.getZxid();
nextProcessor.processRequest(request);
}