/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.cql3.statements;
import java.nio.ByteBuffer;
import java.util.*;
import org.github.jamm.MemoryMeter;
import org.apache.cassandra.auth.Permission;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.cql3.*;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.composites.CBuilder;
import org.apache.cassandra.db.composites.Composite;
import org.apache.cassandra.db.filter.ColumnSlice;
import org.apache.cassandra.db.filter.IDiskAtomFilter;
import org.apache.cassandra.db.filter.SliceQueryFilter;
import org.apache.cassandra.db.marshal.ListType;
import org.apache.cassandra.db.marshal.BooleanType;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.service.CASConditions;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.service.StorageProxy;
import org.apache.cassandra.thrift.ThriftValidation;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.utils.Pair;
/*
* Abstract parent class of individual modifications, i.e. INSERT, UPDATE and DELETE.
*/
public abstract class ModificationStatement implements CQLStatement, MeasurableForPreparedCache
{
private static final ColumnIdentifier CAS_RESULT_COLUMN = new ColumnIdentifier("[applied]", false);
private final int boundTerms;
public final CFMetaData cfm;
public final Attributes attrs;
private final Map<ColumnIdentifier, Restriction> processedKeys = new HashMap<ColumnIdentifier, Restriction>();
private final List<Operation> columnOperations = new ArrayList<Operation>();
private List<Operation> columnConditions;
private boolean ifNotExists;
public ModificationStatement(int boundTerms, CFMetaData cfm, Attributes attrs)
{
this.boundTerms = boundTerms;
this.cfm = cfm;
this.attrs = attrs;
}
public long measureForPreparedCache(MemoryMeter meter)
{
return meter.measure(this)
+ meter.measureDeep(attrs)
+ meter.measureDeep(processedKeys)
+ meter.measureDeep(columnOperations)
+ (columnConditions == null ? 0 : meter.measureDeep(columnConditions));
}
public abstract boolean requireFullClusteringKey();
public abstract ColumnFamily updateForKey(ByteBuffer key, Composite prefix, UpdateParameters params) throws InvalidRequestException;
public int getBoundTerms()
{
return boundTerms;
}
public String keyspace()
{
return cfm.ksName;
}
public String columnFamily()
{
return cfm.cfName;
}
public boolean isCounter()
{
return cfm.isCounter();
}
public long getTimestamp(long now, List<ByteBuffer> variables) throws InvalidRequestException
{
return attrs.getTimestamp(now, variables);
}
public boolean isTimestampSet()
{
return attrs.isTimestampSet();
}
public int getTimeToLive(List<ByteBuffer> variables) throws InvalidRequestException
{
return attrs.getTimeToLive(variables);
}
public void checkAccess(ClientState state) throws InvalidRequestException, UnauthorizedException
{
state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.MODIFY);
// CAS updates can be used to simulate a SELECT query, so should require Permission.SELECT as well.
if (hasConditions())
state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.SELECT);
}
public void validate(ClientState state) throws InvalidRequestException
{
if (hasConditions() && attrs.isTimestampSet())
throw new InvalidRequestException("Cannot provide custom timestamp for conditional updates");
if (isCounter() && attrs.isTimestampSet())
throw new InvalidRequestException("Cannot provide custom timestamp for counter updates");
if (isCounter() && attrs.isTimeToLiveSet())
throw new InvalidRequestException("Cannot provide custom TTL for counter updates");
}
public void addOperation(Operation op)
{
columnOperations.add(op);
}
public List<Operation> getOperations()
{
return columnOperations;
}
public void addCondition(Operation op)
{
if (columnConditions == null)
columnConditions = new ArrayList<Operation>();
columnConditions.add(op);
}
public void setIfNotExistCondition()
{
ifNotExists = true;
}
private void addKeyValues(ColumnIdentifier name, Restriction values) throws InvalidRequestException
{
if (processedKeys.put(name, values) != null)
throw new InvalidRequestException(String.format("Multiple definitions found for PRIMARY KEY part %s", name));
}
public void addKeyValue(ColumnIdentifier name, Term value) throws InvalidRequestException
{
addKeyValues(name, new Restriction.EQ(value, false));
}
public void processWhereClause(List<Relation> whereClause, VariableSpecifications names) throws InvalidRequestException
{
for (Relation rel : whereClause)
{
ColumnDefinition def = cfm.getColumnDefinition(rel.getEntity());
if (def == null)
throw new InvalidRequestException(String.format("Unknown key identifier %s", rel.getEntity()));
switch (def.kind)
{
case PARTITION_KEY:
case CLUSTERING_COLUMN:
Restriction restriction;
if (rel.operator() == Relation.Type.EQ)
{
Term t = rel.getValue().prepare(keyspace(), def);
t.collectMarkerSpecification(names);
restriction = new Restriction.EQ(t, false);
}
else if (def.kind == ColumnDefinition.Kind.PARTITION_KEY && rel.operator() == Relation.Type.IN)
{
if (rel.getValue() != null)
{
Term t = rel.getValue().prepare(keyspace(), def);
t.collectMarkerSpecification(names);
restriction = Restriction.IN.create(t);
}
else
{
List<Term> values = new ArrayList<Term>(rel.getInValues().size());
for (Term.Raw raw : rel.getInValues())
{
Term t = raw.prepare(keyspace(), def);
t.collectMarkerSpecification(names);
values.add(t);
}
restriction = Restriction.IN.create(values);
}
}
else
{
throw new InvalidRequestException(String.format("Invalid operator %s for PRIMARY KEY part %s", rel.operator(), def.name));
}
addKeyValues(def.name, restriction);
break;
case COMPACT_VALUE:
case REGULAR:
throw new InvalidRequestException(String.format("Non PRIMARY KEY %s found in where clause", def.name));
}
}
}
public List<ByteBuffer> buildPartitionKeyNames(List<ByteBuffer> variables)
throws InvalidRequestException
{
CBuilder keyBuilder = cfm.getKeyValidatorAsCType().builder();
List<ByteBuffer> keys = new ArrayList<ByteBuffer>();
for (ColumnDefinition def : cfm.partitionKeyColumns())
{
Restriction r = processedKeys.get(def.name);
if (r == null)
throw new InvalidRequestException(String.format("Missing mandatory PRIMARY KEY part %s", def.name));
List<ByteBuffer> values = r.values(variables);
if (keyBuilder.remainingCount() == 1)
{
for (ByteBuffer val : values)
{
if (val == null)
throw new InvalidRequestException(String.format("Invalid null value for partition key part %s", def.name));
keys.add(keyBuilder.buildWith(val).toByteBuffer());
}
}
else
{
if (values.size() != 1)
throw new InvalidRequestException("IN is only supported on the last column of the partition key");
ByteBuffer val = values.get(0);
if (val == null)
throw new InvalidRequestException(String.format("Invalid null value for partition key part %s", def.name));
keyBuilder.add(val);
}
}
return keys;
}
public Composite createClusteringPrefix(List<ByteBuffer> variables)
throws InvalidRequestException
{
CBuilder builder = cfm.comparator.prefixBuilder();
ColumnDefinition firstEmptyKey = null;
for (ColumnDefinition def : cfm.clusteringColumns())
{
Restriction r = processedKeys.get(def.name);
if (r == null)
{
firstEmptyKey = def;
if (requireFullClusteringKey() && !cfm.comparator.isDense() && cfm.comparator.isCompound())
throw new InvalidRequestException(String.format("Missing mandatory PRIMARY KEY part %s", def.name));
}
else if (firstEmptyKey != null)
{
throw new InvalidRequestException(String.format("Missing PRIMARY KEY part %s since %s is set", firstEmptyKey.name, def.name));
}
else
{
List<ByteBuffer> values = r.values(variables);
assert values.size() == 1; // We only allow IN for row keys so far
ByteBuffer val = values.get(0);
if (val == null)
throw new InvalidRequestException(String.format("Invalid null value for clustering key part %s", def.name));
builder.add(val);
}
}
return builder.build();
}
protected ColumnDefinition getFirstEmptyKey()
{
for (ColumnDefinition def : cfm.clusteringColumns())
{
if (processedKeys.get(def.name) == null)
return def;
}
return null;
}
protected Map<ByteBuffer, CQL3Row> readRequiredRows(List<ByteBuffer> partitionKeys, Composite clusteringPrefix, boolean local, ConsistencyLevel cl)
throws RequestExecutionException, RequestValidationException
{
// Lists SET operation incurs a read.
Set<ColumnIdentifier> toRead = null;
for (Operation op : columnOperations)
{
if (op.requiresRead())
{
if (toRead == null)
toRead = new TreeSet<ColumnIdentifier>();
toRead.add(op.column.name);
}
}
return toRead == null ? null : readRows(partitionKeys, clusteringPrefix, toRead, cfm, local, cl);
}
protected Map<ByteBuffer, CQL3Row> readRows(List<ByteBuffer> partitionKeys, Composite rowPrefix, Set<ColumnIdentifier> toRead, CFMetaData cfm, boolean local, ConsistencyLevel cl)
throws RequestExecutionException, RequestValidationException
{
try
{
cl.validateForRead(keyspace());
}
catch (InvalidRequestException e)
{
throw new InvalidRequestException(String.format("Write operation require a read but consistency %s is not supported on reads", cl));
}
ColumnSlice[] slices = new ColumnSlice[toRead.size()];
int i = 0;
for (ColumnIdentifier name : toRead)
slices[i++] = cfm.comparator.create(rowPrefix, name).slice();
List<ReadCommand> commands = new ArrayList<ReadCommand>(partitionKeys.size());
long now = System.currentTimeMillis();
for (ByteBuffer key : partitionKeys)
commands.add(new SliceFromReadCommand(keyspace(),
key,
columnFamily(),
now,
new SliceQueryFilter(slices, false, Integer.MAX_VALUE)));
List<Row> rows = local
? SelectStatement.readLocally(keyspace(), commands)
: StorageProxy.read(commands, cl);
Map<ByteBuffer, CQL3Row> map = new HashMap<ByteBuffer, CQL3Row>();
for (Row row : rows)
{
if (row.cf == null || row.cf.isEmpty())
continue;
Iterator<CQL3Row> iter = cfm.comparator.CQL3RowBuilder(now).group(row.cf.getSortedColumns().iterator());
if (iter.hasNext())
{
map.put(row.key.key, iter.next());
// We can only update one CQ3Row per partition key at a time (we don't allow IN for clustering key)
assert !iter.hasNext();
}
}
return map;
}
public boolean hasConditions()
{
return ifNotExists || (columnConditions != null && !columnConditions.isEmpty());
}
public ResultMessage execute(QueryState queryState, QueryOptions options)
throws RequestExecutionException, RequestValidationException
{
if (options.getConsistency() == null)
throw new InvalidRequestException("Invalid empty consistency level");
if (hasConditions() && options.getProtocolVersion() == 1)
throw new InvalidRequestException("Conditional updates are not supported by the protocol version in use. You need to upgrade to a driver using the native protocol v2.");
return hasConditions()
? executeWithCondition(queryState, options)
: executeWithoutCondition(queryState, options);
}
private ResultMessage executeWithoutCondition(QueryState queryState, QueryOptions options)
throws RequestExecutionException, RequestValidationException
{
ConsistencyLevel cl = options.getConsistency();
if (isCounter())
cl.validateCounterForWrite(cfm);
else
cl.validateForWrite(cfm.ksName);
Collection<? extends IMutation> mutations = getMutations(options.getValues(), false, cl, queryState.getTimestamp(), false);
if (!mutations.isEmpty())
StorageProxy.mutateWithTriggers(mutations, cl, false);
return null;
}
public ResultMessage executeWithCondition(QueryState queryState, QueryOptions options)
throws RequestExecutionException, RequestValidationException
{
List<ByteBuffer> variables = options.getValues();
List<ByteBuffer> keys = buildPartitionKeyNames(variables);
// We don't support IN for CAS operation so far
if (keys.size() > 1)
throw new InvalidRequestException("IN on the partition key is not supported with conditional updates");
Composite clusteringPrefix = createClusteringPrefix(variables);
ByteBuffer key = keys.get(0);
ThriftValidation.validateKey(cfm, key);
UpdateParameters updParams = new UpdateParameters(cfm, variables, queryState.getTimestamp(), getTimeToLive(variables), null);
ColumnFamily updates = updateForKey(key, clusteringPrefix, updParams);
// It's cleaner to use the query timestamp below, but it's in seconds while the conditions expects microseconds, so just
// put it back in millis (we don't really lose precision because the ultimate consumer, Column.isLive, re-divide it).
long now = queryState.getTimestamp() * 1000;
CASConditions conditions = ifNotExists
? new NotExistCondition(clusteringPrefix, now)
: new ColumnsConditions(clusteringPrefix, cfm, key, columnConditions, variables, now);
ColumnFamily result = StorageProxy.cas(keyspace(),
columnFamily(),
key,
conditions,
updates,
options.getSerialConsistency(),
options.getConsistency());
return new ResultMessage.Rows(buildCasResultSet(key, result));
}
private ResultSet buildCasResultSet(ByteBuffer key, ColumnFamily cf) throws InvalidRequestException
{
boolean success = cf == null;
ColumnSpecification spec = new ColumnSpecification(keyspace(), columnFamily(), CAS_RESULT_COLUMN, BooleanType.instance);
ResultSet.Metadata metadata = new ResultSet.Metadata(Collections.singletonList(spec));
List<List<ByteBuffer>> rows = Collections.singletonList(Collections.singletonList(BooleanType.instance.decompose(success)));
ResultSet rs = new ResultSet(metadata, rows);
return success ? rs : merge(rs, buildCasFailureResultSet(key, cf));
}
private static ResultSet merge(ResultSet left, ResultSet right)
{
if (left.size() == 0)
return right;
else if (right.size() == 0)
return left;
assert left.size() == 1 && right.size() == 1;
int size = left.metadata.names.size() + right.metadata.names.size();
List<ColumnSpecification> specs = new ArrayList<ColumnSpecification>(size);
specs.addAll(left.metadata.names);
specs.addAll(right.metadata.names);
List<ByteBuffer> row = new ArrayList<ByteBuffer>(size);
row.addAll(left.rows.get(0));
row.addAll(right.rows.get(0));
return new ResultSet(new ResultSet.Metadata(specs), Collections.singletonList(row));
}
private ResultSet buildCasFailureResultSet(ByteBuffer key, ColumnFamily cf) throws InvalidRequestException
{
Selection selection;
if (ifNotExists)
{
selection = Selection.wildcard(cfm);
}
else
{
List<ColumnDefinition> defs = new ArrayList<>(columnConditions.size());
for (Operation condition : columnConditions)
defs.add(condition.column);
selection = Selection.forColumns(defs);
}
long now = System.currentTimeMillis();
Selection.ResultSetBuilder builder = selection.resultSetBuilder(now);
SelectStatement.forSelection(cfm, selection).processColumnFamily(key, cf, Collections.<ByteBuffer>emptyList(), now, builder);
return builder.build();
}
public ResultMessage executeInternal(QueryState queryState) throws RequestValidationException, RequestExecutionException
{
if (hasConditions())
throw new UnsupportedOperationException();
for (IMutation mutation : getMutations(Collections.<ByteBuffer>emptyList(), true, null, queryState.getTimestamp(), false))
{
// We don't use counters internally.
assert mutation instanceof Mutation;
((Mutation) mutation).apply();
}
return null;
}
/**
* Convert statement into a list of mutations to apply on the server
*
* @param variables value for prepared statement markers
* @param local if true, any requests (for collections) performed by getMutation should be done locally only.
* @param cl the consistency to use for the potential reads involved in generating the mutations (for lists set/delete operations)
* @param now the current timestamp in microseconds to use if no timestamp is user provided.
*
* @return list of the mutations
* @throws InvalidRequestException on invalid requests
*/
public Collection<? extends IMutation> getMutations(List<ByteBuffer> variables, boolean local, ConsistencyLevel cl, long now, boolean isBatch)
throws RequestExecutionException, RequestValidationException
{
List<ByteBuffer> keys = buildPartitionKeyNames(variables);
Composite clusteringPrefix = createClusteringPrefix(variables);
// Some lists operation requires reading
Map<ByteBuffer, CQL3Row> rows = readRequiredRows(keys, clusteringPrefix, local, cl);
UpdateParameters params = new UpdateParameters(cfm, variables, getTimestamp(now, variables), getTimeToLive(variables), rows);
Collection<IMutation> mutations = new ArrayList<IMutation>();
for (ByteBuffer key: keys)
{
ThriftValidation.validateKey(cfm, key);
ColumnFamily cf = updateForKey(key, clusteringPrefix, params);
mutations.add(makeMutation(key, cf, cl, isBatch));
}
return mutations;
}
private IMutation makeMutation(ByteBuffer key, ColumnFamily cf, ConsistencyLevel cl, boolean isBatch)
{
Mutation mutation;
if (isBatch)
{
// we might group other mutations together with this one later, so make it mutable
mutation = new Mutation(cfm.ksName, key);
mutation.add(cf);
}
else
{
mutation = new Mutation(cfm.ksName, key, cf);
}
return isCounter() ? new CounterMutation(mutation, cl) : mutation;
}
private static abstract class CQL3CasConditions implements CASConditions
{
protected final Composite rowPrefix;
protected final long now;
protected CQL3CasConditions(Composite rowPrefix, long now)
{
this.rowPrefix = rowPrefix;
this.now = now;
}
public IDiskAtomFilter readFilter()
{
// We always read the row entirely as on CAS failure we want to be able to distinguish between "row exists
// but all values on why there were conditions are null" and "row doesn't exists", and we can't rely on the
// row marker for that (see #6623)
return new SliceQueryFilter(rowPrefix.slice(), false, 1, rowPrefix.size());
}
}
private static class NotExistCondition extends CQL3CasConditions
{
private NotExistCondition(Composite rowPrefix, long now)
{
super(rowPrefix, now);
}
public boolean appliesTo(ColumnFamily current)
{
return current == null || current.hasOnlyTombstones(now);
}
}
private static class ColumnsConditions extends CQL3CasConditions
{
private final ColumnFamily expected;
private ColumnsConditions(Composite rowPrefix,
CFMetaData cfm,
ByteBuffer key,
Collection<Operation> conditions,
List<ByteBuffer> variables,
long now) throws InvalidRequestException
{
super(rowPrefix, now);
this.expected = ArrayBackedSortedColumns.factory.create(cfm);
// When building the conditions, we should not use a TTL. It's not useful, and if a very low ttl (1 seconds) is used, it's possible
// for it to expire before the actual build of the conditions which would break since we would then testing for the presence of tombstones.
UpdateParameters params = new UpdateParameters(cfm, variables, now, 0, null);
// Conditions
for (Operation condition : conditions)
condition.execute(key, expected, rowPrefix, params);
}
public boolean appliesTo(ColumnFamily current)
{
if (current == null)
return false;
for (Cell e : expected)
{
Cell c = current.getColumn(e.name());
if (e.isLive(now))
{
if (c == null || !c.isLive(now) || !c.value().equals(e.value()))
return false;
}
else
{
// If we have a tombstone in expected, it means the condition tests that the column is
// null, so check that we have no value
if (c != null && c.isLive(now))
return false;
}
}
return true;
}
@Override
public String toString()
{
return expected.toString();
}
}
public static abstract class Parsed extends CFStatement
{
protected final Attributes.Raw attrs;
private final List<Pair<ColumnIdentifier, Operation.RawUpdate>> conditions;
private final boolean ifNotExists;
protected Parsed(CFName name, Attributes.Raw attrs, List<Pair<ColumnIdentifier, Operation.RawUpdate>> conditions, boolean ifNotExists)
{
super(name);
this.attrs = attrs;
this.conditions = conditions == null ? Collections.<Pair<ColumnIdentifier, Operation.RawUpdate>>emptyList() : conditions;
this.ifNotExists = ifNotExists;
}
public ParsedStatement.Prepared prepare() throws InvalidRequestException
{
VariableSpecifications boundNames = getBoundVariables();
ModificationStatement statement = prepare(boundNames);
return new ParsedStatement.Prepared(statement, boundNames);
}
public ModificationStatement prepare(VariableSpecifications boundNames) throws InvalidRequestException
{
CFMetaData metadata = ThriftValidation.validateColumnFamily(keyspace(), columnFamily());
Attributes preparedAttributes = attrs.prepare(keyspace(), columnFamily());
preparedAttributes.collectMarkerSpecification(boundNames);
ModificationStatement stmt = prepareInternal(metadata, boundNames, preparedAttributes);
if (ifNotExists || !conditions.isEmpty())
{
if (stmt.isCounter())
throw new InvalidRequestException("Conditional updates are not supported on counter tables");
if (attrs.timestamp != null)
throw new InvalidRequestException("Cannot provide custom timestamp for conditional updates");
if (ifNotExists)
{
// To have both 'IF NOT EXISTS' and some other conditions doesn't make sense.
// So far this is enforced by the parser, but let's assert it for sanity if ever the parse changes.
assert conditions.isEmpty();
stmt.setIfNotExistCondition();
}
else
{
for (Pair<ColumnIdentifier, Operation.RawUpdate> entry : conditions)
{
ColumnDefinition def = metadata.getColumnDefinition(entry.left);
if (def == null)
throw new InvalidRequestException(String.format("Unknown identifier %s", entry.left));
/*
* Lists column names are based on a server-side generated timeuuid. So we can't allow lists
* operation or that would yield unexpected results (update that should apply wouldn't). So for
* now, we just refuse lists, which also save use from having to bother about the read that some
* list operation involve.
*/
if (def.type instanceof ListType)
throw new InvalidRequestException(String.format("List operation (%s) are not allowed in conditional updates", def.name));
Operation condition = entry.right.prepare(keyspace(), def);
assert !condition.requiresRead();
condition.collectMarkerSpecification(boundNames);
switch (def.kind)
{
case PARTITION_KEY:
case CLUSTERING_COLUMN:
throw new InvalidRequestException(String.format("PRIMARY KEY part %s found in SET part", entry.left));
case COMPACT_VALUE:
case REGULAR:
stmt.addCondition(condition);
break;
}
}
}
}
return stmt;
}
protected abstract ModificationStatement prepareInternal(CFMetaData cfm, VariableSpecifications boundNames, Attributes attrs) throws InvalidRequestException;
}
}