* @param request
*/
public void prepRequest(Request request, long txnId) {
// 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,
txnId, getTime(), OpCode.create);
CreateRequest createRequest = new CreateRequest();
ZooKeeperServer.byteBuffer2Record(request.request,
createRequest);
String path = createRequest.getPath();
int lastSlash = path.lastIndexOf('/');
if (lastSlash == -1 || path.indexOf('\0') != -1) {
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(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("%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,
txnId, getTime(), OpCode.delete);
DeleteRequest deleteRequest = new DeleteRequest();
ZooKeeperServer.byteBuffer2Record(request.request,
deleteRequest);
path = deleteRequest.getPath();
lastSlash = path.lastIndexOf('/');
if (lastSlash == -1 || path.indexOf('\0') != -1
|| getZKDatabase().isSpecialPath(path)) {
throw new KeeperException.BadArgumentsException(path);
}
parentPath = path.substring(0, lastSlash);
parentRecord = getRecordForPath(parentPath);
ChangeRecord nodeRecord = getRecordForPath(path);
checkACL(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,
txnId, getTime(), OpCode.setData);
SetDataRequest setDataRequest = new SetDataRequest();
ZooKeeperServer.byteBuffer2Record(request.request,
setDataRequest);
path = setDataRequest.getPath();
nodeRecord = getRecordForPath(path);
checkACL(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,
txnId, getTime(), OpCode.setACL);
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(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,
txnId, getTime(), OpCode.createSession);
request.request.rewind();
int to = request.request.getInt();
txn = new CreateSessionTxn((Long)request.getOwner());
request.request.rewind();
sessionTracker.addSession(request.sessionId,
(Long) request.getOwner());
break;
case OpCode.closeSession:
txnHeader = new TxnHeader(request.sessionId, request.cxid,
txnId, 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 = getZKDatabase().getEphemerals(
request.sessionId);
synchronized (outstandingChanges) {
for (ChangeRecord c : 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));
}
}
sessionTracker.removeSession(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:
default:
}
} catch (KeeperException e) {
if (txnHeader != null) {
txnHeader.setType(OpCode.error);
txn = new ErrorTxn(e.code().intValue());
}
LOG.debug("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;