Motivation:
[DNS-over-TLS (DoT)](https://tools.ietf.org/html/rfc7858.html) encrypts DNS queries and sends it over TLS connection to make sure queries are secure in transit.
[TCP DNS](https://tools.ietf.org/html/rfc7766) sends DNS queries over TCP connection (unencrypted).
Modification:
Add DNS-over-TLS (DoT) Client Example which uses TLSv1.2 and TLSv1.3.
Add TCP DNS Client Example
Result:
DNS-over-TLS (DoT) Client Example
TCP DNS Client Example
Motivation
- Recycler stack and delayed queue drop ratio can only be configured with
the same value. The overall drop ratio is ratio^2.
- #10251 shows that enable drop in `WeakOrderQueue` may introduce
performance degradation. Though the final reason is not clear now,
it would be better to add option to configure delayed queue drop ratio separately.
Modification
- "io.netty.recycler.delayedQueue.ratio" as the drop ratio of delayed queue
- default "delayedQueue.ratio" is same as "ratio"
Results
Able to configure recycler delayed queue drop ratio separately
Motivation
1. It's inable to collect all object because RATIO is always >=1 after
`safeFindNextPositivePowerOfTwo`
2. Enable drop object in `WeakOrderQueue`(commit:
71860e5b94) enlarge the drop ratio. We
can subtly control the overall drop ratio by using `io.netty.recycler.ratio` directly,
Modification
- Remove `safeFindNextPositivePowerOfTwo` before set the ratio
Results
Able to disable drop when recycle object
Motivation:
We cant reuse the ChannelPromise as it will cause an error when trying to ful-fill it multiple times.
Modifications:
- Use a new promise and chain it with the old one
- Add unit test
Result:
Fixes https://github.com/netty/netty/issues/10240
Motivation:
`io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_PRIORITY_WEIGHT` is never used in DefaultHttp2ConnectionEncoder.java.
Modification:
Just remove this unused import.
Result:
Make the DefaultHttp2ConnectionEncoder.java's imports clean.
Motivation
An NPE was reported in #10245, caused by a regression introduced in
#8939. This in particular affects ByteToMessageDecoders that use the
COMPOSITE_CUMULATOR.
Modification
- Unwrap WrappedCompositeByteBufs passed to
CompositeByteBuf#addFlattenedComponents(...) method before accessing
internal components field
- Extend unit test to cover this case and ensure more of the
CompositeByteBuf tests are also run on the wrapped variant
Results
Fixes#10245
Motivation:
EC is better than RSA because of the small key size, efficient and secure which makes it perfect for testing purposes.
Modification:
Added support to specify an algorithm (EC or RSA) in constructors for key pair generation. The default key size is 256-bits as promulgated by NSA Suite B.
Result:
Able to generate a self-signed certificate of EC or RSA.
Motivation:
We should not use Unpooled to allocate buffers if possible to ensure we can make use of pooling etc.
Modifications:
- Only allocate a buffer if really needed
- Use the ByteBufAllocator of the offered ByteBuf
- Ensure we not use buffer.copy() but explicitly allocate a buffer and then copy into it to not hit the limit of maxCapacity()
Result:
Improve allocations
Motivation:
We need to release all ByteBufs that we allocate to prevent leaks. We missed to release the ByteBufs that are used to aggregate in two cases
Modifications:
Add release() calls
Result:
No more memory leak in HttpPostMultipartRequestDecoder
Motivation:
We should only log with warn level if something really critical happens as otherwise we may spam logs and confuse the user.
Modifications:
- Change log level to debug for most cases
Result:
Less noisy logging
Motivation:
We need to detect CNAME loops during lookup the DnsCnameCache as otherwise we may try to follow cnames forever.
Modifications:
- Correctly detect CNAME loops in the cache
- Add unit test
Result:
Fixes https://github.com/netty/netty/issues/10220
Motivation:
We are far behind with the version of Conscrypt we are using during testing. We should ensure we use the latest.
Modifications:
- Update conscrypt dependency
- Ensure we use conscrypt provider in tests
- Add workarounds for conscrypt bugs in testsuite
Result:
Use latest Conscrypt release
Motivations
-----------
There is no need to copy the "offered" ByteBuf in HttpPostRequestDecoder
when the first HttpContent ByteBuf is also the last (LastHttpContent) as
the full content can immediately be decoded. No extra bookeeping needed.
Modifications
-------------
HttpPostMultipartRequestDecoder
- Retain the first ByteBuf when it is both the first HttpContent offered
to the decoder and is also LastHttpContent.
- Retain slices of the final buffers values
Results
-------
ByteBufs of FullHttpMessage decoded by HttpPostRequestDecoder are no longer
unnecessarily copied. Attributes are extracted as retained slices when
the content is multi-part. Non-multi-part content continues to return
Unpooled buffers.
Partially addresses issue #10200
Motivation:
`AbstractHttpData.checkSize` may throw an IOException if we set the max size limit via `AbstractHttpData.setMaxSize`. However, if this exception happens, the `AbstractDiskHttpData.file` and the `AbstractHttpData.size` are still be modified. In other words, it may break the failure atomicity here.
Modification:
Just move up the size check.
Result:
Keep the failure atomicity even if `AbstractHttpData.checkSize` fails.
Motivations
-----------
DnsNameResolverBuilder and DnsNameResolver do not auto-configure
themselves uing default options define in /etc/resolv.conf.
In particular, rotate, timeout and attempts options are ignored.
Modifications
-------------
- Modified UnixResolverDnsServerAddressStreamProvider to parse ndots,
attempts and timeout options all at once and use these defaults to
configure DnsNameResolver when values are not provided by the
DnsNameResolverBuilder.
- When rotate option is specified, the DnsServerAddresses returned by
UnixResolverDnsServerAddressStreamProvider is rotational.
- Amend resolv.conf options with the RES_OPTIONS environment variable
when present.
Result:
Fixes https://github.com/netty/netty/issues/10202
Motivation:
Currently calculateSize method in AbstractTrafficShapingHandler calculates size for object of type ByteBuf or ByteBufHolder. Adding a check for FileRegion, makes it possible to do traffic shaping for FileRegion objects as well
Modification:
Check if object to be sent is of type FileRegion, if yes calculate the size using its count() method.
Co-authored-by: Dinesh Joshi <dinesh.joshi@apple.com>
Motivation:
`io.netty.channel.ChannelHandler` is never used in JsonObjectDecoder.java.
Modification:
Just remove this unused import.
Result:
Make the JsonObjectDecoder.java's imports simple and clean.
Motivation:
An unexpected IOException may be thrown from `FileChannel.force`. If it happens, the `FileChannel.close` may not be invoked.
Modification:
Place the `FileChannel.close` in a finally block.
Result:
Avoid fd leak.
Motivation:
We need to make some slightly changes to be able to build on Java15 as some previous deprecated methods now throw UnsupportedOperationException
Modifications:
- Add code to handle UnsupportedOperationException
- Revert previous applied workaround for bug that was fixed in Java15
- Add maven profile
Result:
Be able to build with latest Java15 EA release
Motivation:
We can make use of our optimized implementations for UTF-8 and US-ASCII if the user request a copy of a sequence for these charsets
Modifications:
- Add fastpath implementation
- Add unit tests
Result:
Fixes https://github.com/netty/netty/issues/10205
Motivation:
`transport-native-epoll` doesn't have ARM release package.
Modification:
This PR added cross compile profile for epoll. Then we can easily build aarch64 package on X86 machine.
Result:
Fixes#8279
Motivation:
Http2ConnectionHandler may call ctx.close(...) with the same promise instance multiple times if the timeout for gracefulShutdown elapse and the listener itself is notified. This can cause problems as other handlers in the pipeline may queue these promises and try to notify these later via setSuccess() or setFailure(...) which will then throw an IllegalStateException if the promise was notified already
Modification:
- Add boolean flag to ensure doClose() will only try to call ctx.close(...) one time
Result:
Don't call ctx.close(...) with the same promise multiple times when gradefulShutdown timeout elapses.
Motivation:
We should provide more informations when ALPN is not supported and a user tries to use it.
Modifications:
- Use UnsupportedOperationException
Result:
Easier to debug ALPN problems
Motivation:
ALPN support was backported to java 8 lately. Ensure we support it if the user uses the latest java 8 release
Modifications:
- Update logic to be able to detect if ALPN is supported out of the box when using Java8
- Update jetty alpn version
Result:
Be able to use ALPN out of the box when using java 8u251
Motivation:
We need to ensure we not overflow when adding buffers to a CompositeByteBuf
Modifications:
- Correctly validate overflow before adding to the internal storage
- Add testcase
Result:
Fixes https://github.com/netty/netty/issues/10194
Motivation:
`RandomAccessFile.setLength` may throw an IOException. We must deal with this in case of the occurrence of `I/O` error.
Modification:
Place the `RandomAccessFile.setLength` method call in the `try-finally` block.
Result:
Avoid fd leak.
Motivation:
Add support for HAProxyMessageEncoder.
This should help java based HAProxy server implementations propagate proxy information.
Modification:
Add public constructors for `HAProxyMessage`, `HAProxyTLV`, `HAProxySSLTLV`.
Add additional argument checks for `HAProxyMessage` and modify exceptions thrown when creating via public constructors directly.
Introduce a `@Sharable` `HAProxyMessageEncoder` which encodes a `HAProxyMessage` into a byte array.
Add an example `HAProxyServer` and `HAProxyClient` to `io.netty.example`
Result:
Fixes#10164
Motivation:
In AbstractChannelHandlerContext we had some code where we tried to guard against endless loops caused by exceptions thrown by exceptionCaught(...) that would trigger exceptionCaught again. This code was proplematic for two reasons:
- It is quite expensive as we need to compare all the stacks
- We may end up not notify another handlers exceptionCaught(...) if in our exeuction stack we triggered actions that will cause an exceptionCaught somewhere else in the pipeline
Modifications:
- Just remove the detection code as we already handle everything correctly when we invoke exceptionCaught(...)
- Add unit tests
Result:
Ensure we always notify correctly and also fixes performance issue reported as https://github.com/netty/netty/issues/10165
Motivation:
netty_epoll_linuxsocket_JNI_OnLoad(...) may produce a deadlock with another thread that will load IOUtil in a static block. This seems to be a JDK bug which is not yet fixed. To workaround this we force IOUtil to be loaded from without java code before init the JNI code
Modifications:
Use Selector.open() as a workaround to load IOUtil
Result:
Fixes https://github.com/netty/netty/issues/10187
Motivation:
We have found out that ByteBufUtil.indexOf can be inefficient for substring search on
ByteBuf, both in terms of algorithm complexity (worst case O(needle.readableBytes *
haystack.readableBytes)), and in constant factor (esp. on Composite buffers).
With implementation of more performant search algorithms we have seen improvements on
the order of magnitude.
Modifications:
This change introduces three search algorithms:
1. Knuth Morris Pratt - classical textbook algorithm, a good default choice.
2. Bit mask based algorithm - stable performance on any input, but limited to maximum
search substring (the needle) length of 64 bytes.
3. Aho–Corasick - worse performance and higher memory consumption than [1] and [2], but
it supports multiple substring (the needles) search simultaneously, by inspecting every
byte of the haystack only once.
Each algorithm processes every byte of underlying buffer only once, they are implemented
as ByteProcessor.
Result:
Efficient search algorithms with linear time complexity available in Netty (I will share
benchmark results in a comment on a PR).
Motivation:
`FileChannel.force` may throw an IOException. A fd leak may happen here.
Modification:
Close the fileChannel in a finally block.
Result:
Avoid fd leak.
Motivation:
To ensure we always recycle the CodecOutputList we should better do it in a finally block
Modifications:
Call CodecOutputList.recycle() in finally
Result:
Less chances of non-recycled lists. Related to https://github.com/netty/netty/issues/10183
Motivation:
The `AbstractTrafficShapingHandler` caches the `ReopenReadTimerTask` instance in the channel attribute. However, if this handler is removed from the channel pipeline, this `ReopenReadTimerTask` instance may not be released.
Modification:
Release the channel attribute `REOPEN_TASK` in `handlerRemoved` method.
Result:
Avoid a channel attribute leak.
Motivation:
Parameter maxCount needs the unit test.
Modifications:
1. Change the conditional statement to avoid the ineffective maxCount (enhance the robustness of the code merely).
2. Add the unit test for maxCount.
Result:
Enable this parameter to be tested.
Motivation:
We should update our optional bouncycastle dependency to ensure we use the latest which has all the security fixes
Modifications:
Update bouncycastle version
Result:
Fixes https://github.com/netty/netty/issues/10184
Motivation:
Only cipher suite is logged during handshake. Picked protocol is interesting too.
Modification:
Log protocol as well.
Result:
More interesting information when debugging TLS handshakes.
**Motivation:**
Following up on https://github.com/netty/netty/issues/10181
I was able to successfully setup a Netty server with TLS on Android, using Conscrypt, with the change proposed here. Conscrypt publishes an [Android specific version](https://github.com/google/conscrypt#android). But the current availability check prevents Netty from using it (the call `PlatformDependent.javaVersion()` returns `6` on Android).
**Modification:**
Check whether the java version is above 8, or if it's running on an Android device, to flag Conscrypt as available (besides the remaining checks).
**Result:**
Netty with TLS runs fine on Android 👍
Motivation:
Often people want to use `stomp-codec` with WebSocket transport or other but cannot figure out how can do this staff on Netty.
Modification:
Create example for demonstrating integration between STOMP and WebSocket.
Inspired by https://github.com/jmesnil/stomp-websocket
Result:
Fixes#9383
Motivation:
A user might want to cancel DNS resolution when it takes too long.
Currently, there's no way to cancel the internal DNS queries especially when there's a lot of search domains.
Modification:
- Stop sending a DNS query if the original `Promise`, which was passed calling `resolve()`, is canceled.
Result:
- You can now stop sending DNS queries by cancelling the `Promise`.
Motivation:
Related https://github.com/line/armeria/issues/2463
Here is an example that an NIC has only link local address for IPv6.
```
$ ipaddr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
3: eth0@if18692: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1460 qdisc noqueue
link/ether 1a:5e:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 10.xxx.xxx.xxx/24 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::xxxx:xxxx:xxxx:xxxx/64 scope link
valid_lft forever preferred_lft forever
```
If the NICs have only local or link local addresses, We should not send IPv6 DNS queris.
Modification:
- Ignore link-local IPv6 addresses which may exist even on a machine without IPv6 network.
Result:
- `DnsNameResolver` does not send DNS queries for AAAA when IPv6 is not available.
Motivation:
An `IOException` may be thrown from `FileChannel.write` or `FileChannel.force`, and cause the fd leak.
Modification:
Close the file in a finally block.
Result:
Avoid fd leak.
Motivation:
PoolChunk requires a link to a PoolThreadCache to init ByteBuf. Currently the link is retrieved from a thread local: arena.parent.threadCache().
It has some performance cost. At the beginning of the allocation call the PoolThreadCache is already retrieved from the thread local. The reference can be propagated through the calls and used.
Modifications:
Replace second lookup of PoolThreadCache during ByteBuf init by propagation of a reference to PoolThreadCache down in the allocation stack explicitly
Result:
Improve performance of ByteBuf allocation
--Before--
Benchmark (size) (tokens) (useThreadCache) Mode Cnt Score Error Units
SimpleByteBufPooledAllocatorBenchmark.getAndRelease 123 0 true avgt 20 57.112 ± 1.004 ns/op
SimpleByteBufPooledAllocatorBenchmark.getAndRelease 123 100 true avgt 20 222.827 ± 1.307 ns/op
--After--
Benchmark (size) (tokens) (useThreadCache) Mode Cnt Score Error Units
SimpleByteBufPooledAllocatorBenchmark.getAndRelease 123 0 true avgt 20 50.732 ± 1.321 ns/op
SimpleByteBufPooledAllocatorBenchmark.getAndRelease 123 100 true avgt 20 216.892 ± 3.806 ns/op
Motivation:
An exception may occur between ByteBuf's allocation and release. So I think it's a good idea to place the release operation in a finally block.
Modification:
Release the temporary ByteBuf in finally blocks.
Result:
Avoid ByteBuf leak.
