/**
* Copyright 2015-2017 The OpenZipkin Authors
*
* Licensed 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 zipkin.storage.cassandra;
import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.PreparedStatement;
import com.google.common.base.Function;
import com.google.common.collect.Sets;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetEncoder;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import zipkin.Annotation;
import zipkin.BinaryAnnotation;
import zipkin.Constants;
import zipkin.Span;
import zipkin.storage.QueryRequest;
import static zipkin.internal.Util.UTF_8;
import static zipkin.internal.Util.checkArgument;
import static zipkin.internal.Util.sortedList;
final class CassandraUtil {
/**
* Zipkin's {@link QueryRequest#binaryAnnotations} are equals match. Not all binary annotations
* are lookup keys. For example, sql query isn't something that is likely to be looked up by value
* and indexing that could add a potentially kilobyte partition key on {@link
* Tables#ANNOTATIONS_INDEX}
*/
static final int LONGEST_VALUE_TO_INDEX = 256;
private static final ThreadLocal<CharsetEncoder> UTF8_ENCODER =
new ThreadLocal<CharsetEncoder>() {
@Override protected CharsetEncoder initialValue() {
return UTF_8.newEncoder();
}
};
static ByteBuffer toByteBuffer(String string) throws CharacterCodingException {
return UTF8_ENCODER.get().encode(CharBuffer.wrap(string));
}
/**
* Returns keys that concatenate the serviceName associated with an annotation or a binary
* annotation.
*
* <p>Note: in the case of binary annotations, only string types are returned, as that's the only
* queryable type, per {@link QueryRequest#binaryAnnotations}.
*
* @see QueryRequest#annotations
* @see QueryRequest#binaryAnnotations
*/
static Set<String> annotationKeys(Span span) {
Set<String> annotationKeys = new LinkedHashSet<>();
for (Annotation a : span.annotations) {
// don't index core annotations as they aren't queryable
if (Constants.CORE_ANNOTATIONS.contains(a.value)) continue;
if (a.endpoint != null && !a.endpoint.serviceName.isEmpty()) {
annotationKeys.add(a.endpoint.serviceName + ":" + a.value);
}
}
for (BinaryAnnotation b : span.binaryAnnotations) {
if (b.type == BinaryAnnotation.Type.STRING
&& b.endpoint != null
&& !b.endpoint.serviceName.isEmpty()
&& b.value.length <= LONGEST_VALUE_TO_INDEX * 4) { // UTF_8 is up to 4bytes/char
String value = new String(b.value, UTF_8);
if (value.length() > LONGEST_VALUE_TO_INDEX) continue;
annotationKeys.add(b.endpoint.serviceName + ":" + b.key);
annotationKeys.add(b.endpoint.serviceName + ":" + b.key + ":" + new String(b.value, UTF_8));
}
}
return annotationKeys;
}
static List<String> annotationKeys(QueryRequest request) {
if (request.annotations.isEmpty() && request.binaryAnnotations.isEmpty()) {
return Collections.emptyList();
}
checkArgument(request.serviceName != null, "serviceName needed with annotation query");
Set<String> annotationKeys = new LinkedHashSet<>();
for (String a : request.annotations) { // doesn't include CORE_ANNOTATIONS
annotationKeys.add(request.serviceName + ":" + a);
}
for (Map.Entry<String, String> b : request.binaryAnnotations.entrySet()) {
annotationKeys.add(request.serviceName + ":" + b.getKey() + ":" + b.getValue());
}
return sortedList(annotationKeys);
}
static Function<Map<Long, Long>, Set<Long>> keyset() {
return (Function) KeySet.INSTANCE;
}
static BoundStatement bindWithName(PreparedStatement prepared, String name) {
return new NamedBoundStatement(prepared, name);
}
enum KeySet implements Function<Map<Object, ?>, Set<Object>> {
INSTANCE;
@Override public Set<Object> apply(Map<Object, ?> input) {
return input.keySet();
}
}
static Function<List<Map<Long, Long>>, Set<Long>> intersectKeySets() {
return (Function) IntersectKeySets.INSTANCE;
}
enum IntersectKeySets implements Function<List<Map<Object, ?>>, Set<Object>> {
INSTANCE;
@Override public Set<Object> apply(List<Map<Object, ?>> input) {
Set<Object> traceIds = Sets.newLinkedHashSet(input.get(0).keySet());
for (int i = 1; i < input.size(); i++) {
traceIds.retainAll(input.get(i).keySet());
}
return traceIds;
}
}
}