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Refactor SslHandler internals to always use heap buffers for JDK SSLE… (#9696)

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Motivation:

We should aim to always use heap buffers when using the JDK SSLEngine for now as it wants to operate on byte[] and so will do internal memory copies if a non heap buffer is used. Beside this it will always return BUFFER_OVERFLOW when a smaller buffer then 16kb is used when calling wrap(...) (even if a very small amount of bytes should be encrypted). This can lead to excercive direct memory usage and pressure for no good reason.

Modifications:

Refactor internals of SslHandler to ensure we use heap buffers for the JDK SSLEngine impelementation

Result:

Less direct memory usage when JDK SSLEngine implementation is used
This commit is contained in:
Norman Maurer 2019-10-23 05:28:42 -07:00
parent 67e3ddb568
commit 7150b42a56
1 changed files with 23 additions and 20 deletions
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43
handler/src/main/java/io/netty/handler/ssl/SslHandler.java
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@ -210,14 +210,10 @@ public class SslHandler extends ByteToMessageDecoder {
}
@Override
int getPacketBufferSize(SslHandler handler) {
return ((ReferenceCountedOpenSslEngine) handler.engine).maxEncryptedPacketLength0();
}
@Override
int calculateWrapBufferCapacity(SslHandler handler, int pendingBytes, int numComponents) {
return ((ReferenceCountedOpenSslEngine) handler.engine).calculateMaxLengthForWrap(pendingBytes,
numComponents);
ByteBuf allocateWrapBuffer(SslHandler handler, ByteBufAllocator allocator,
int pendingBytes, int numComponents) {
return allocator.directBuffer(((ReferenceCountedOpenSslEngine) handler.engine)
.calculateMaxLengthForWrap(pendingBytes, numComponents));
}
@Override
@ -259,8 +255,10 @@ public class SslHandler extends ByteToMessageDecoder {
}
@Override
int calculateWrapBufferCapacity(SslHandler handler, int pendingBytes, int numComponents) {
return ((ConscryptAlpnSslEngine) handler.engine).calculateOutNetBufSize(pendingBytes, numComponents);
ByteBuf allocateWrapBuffer(SslHandler handler, ByteBufAllocator allocator,
int pendingBytes, int numComponents) {
return allocator.directBuffer(
((ConscryptAlpnSslEngine) handler.engine).calculateOutNetBufSize(pendingBytes, numComponents));
}
@Override
@ -302,8 +300,15 @@ public class SslHandler extends ByteToMessageDecoder {
}
@Override
int calculateWrapBufferCapacity(SslHandler handler, int pendingBytes, int numComponents) {
return handler.engine.getSession().getPacketBufferSize();
ByteBuf allocateWrapBuffer(SslHandler handler, ByteBufAllocator allocator,
int pendingBytes, int numComponents) {
// As for the JDK SSLEngine we always need to allocate buffers of the size required by the SSLEngine
// (normally ~16KB). This is required even if the amount of data to encrypt is very small. Use heap
// buffers to reduce the native memory usage.
//
// Beside this the JDK SSLEngine also (as of today) will do an extra heap to direct buffer copy
// if a direct buffer is used as its internals operate on byte[].
return allocator.heapBuffer(handler.engine.getSession().getPacketBufferSize());
}
@Override
@ -327,23 +332,21 @@ public class SslHandler extends ByteToMessageDecoder {
this.cumulator = cumulator;
}
int getPacketBufferSize(SslHandler handler) {
return handler.engine.getSession().getPacketBufferSize();
}
abstract SSLEngineResult unwrap(SslHandler handler, ByteBuf in, int readerIndex, int len, ByteBuf out)
throws SSLException;
abstract int calculateWrapBufferCapacity(SslHandler handler, int pendingBytes, int numComponents);
abstract int calculatePendingData(SslHandler handler, int guess);
abstract boolean jdkCompatibilityMode(SSLEngine engine);
abstract ByteBuf allocateWrapBuffer(SslHandler handler, ByteBufAllocator allocator,
int pendingBytes, int numComponents);
// BEGIN Platform-dependent flags
/**
* {@code true} if and only if {@link SSLEngine} expects a direct buffer.
* {@code true} if and only if {@link SSLEngine} expects a direct buffer and so if a heap buffer
* is given will make an extra memory copy.
*/
final boolean wantsDirectBuffer;
@ -2103,7 +2106,7 @@ public class SslHandler extends ByteToMessageDecoder {
* the specified amount of pending bytes.
*/
private ByteBuf allocateOutNetBuf(ChannelHandlerContext ctx, int pendingBytes, int numComponents) {
return allocate(ctx, engineType.calculateWrapBufferCapacity(this, pendingBytes, numComponents));
return engineType.allocateWrapBuffer(this, ctx.alloc(), pendingBytes, numComponents);
}
/**