spark SaslMessage 源码
spark SaslMessage 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/sasl/SaslMessage.java
/*
* 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.spark.network.sasl;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.apache.spark.network.buffer.NettyManagedBuffer;
import org.apache.spark.network.protocol.Encoders;
import org.apache.spark.network.protocol.AbstractMessage;
import org.apache.spark.network.protocol.Message;
/**
* Encodes a Sasl-related message which is attempting to authenticate using some credentials tagged
* with the given appId. This appId allows a single SaslRpcHandler to multiplex different
* applications which may be using different sets of credentials.
*/
class SaslMessage extends AbstractMessage {
/** Serialization tag used to catch incorrect payloads. */
private static final byte TAG_BYTE = (byte) 0xEA;
public final String appId;
SaslMessage(String appId, byte[] message) {
this(appId, Unpooled.wrappedBuffer(message));
}
SaslMessage(String appId, ByteBuf message) {
super(new NettyManagedBuffer(message), true);
this.appId = appId;
}
@Override
public Message.Type type() { return Type.User; }
@Override
public int encodedLength() {
// The integer (a.k.a. the body size) is not really used, since that information is already
// encoded in the frame length. But this maintains backwards compatibility with versions of
// RpcRequest that use Encoders.ByteArrays.
return 1 + Encoders.Strings.encodedLength(appId) + 4;
}
@Override
public void encode(ByteBuf buf) {
buf.writeByte(TAG_BYTE);
Encoders.Strings.encode(buf, appId);
// See comment in encodedLength().
buf.writeInt((int) body().size());
}
public static SaslMessage decode(ByteBuf buf) {
if (buf.readByte() != TAG_BYTE) {
throw new IllegalStateException("Expected SaslMessage, received something else"
+ " (maybe your client does not have SASL enabled?)");
}
String appId = Encoders.Strings.decode(buf);
// See comment in encodedLength().
buf.readInt();
return new SaslMessage(appId, buf.retain());
}
}
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