Motivation:
If the remote server returns a 4xx/5xx error in response to
a DATA command (or earlier command if using pipelining),
SmtpRequestEncoder can become stuck in an invalid state,
not allowing any requests to be sent.
This makes the channel unusable and the connection has to be closed,
or the encoder handler has to be replaced.
Modifications:
If a RSET command is written to the channel, the contentExpected
flag is set to false, and the RSET is written to the channel.
Result:
Sending a RSET command after a server 4xx/5xx error will make it
possible to use the current connection for new mail transactions.
Motivation:
The native epoll transport allows to wrap an existing filedescriptor, we should support the same in the native kqueue transport.
Modifications:
Add constructors that allow to wrap and existing filedescriptor.
Result:
Featureset of native transports more on par.
Motivation:
For our native libraries in netty we support shading, to have this work on runtime the user needs to set a system property. This code should shared.
Modifications:
Move logic to NativeLbiraryLoader and so share for all native libs.
Result:
Less code duplication and also will work for netty-tcnative out of the box once it support shading
Motivation
SslHandler should release any type of SSLEngine if it implements the ReferenceCounted interface
Modifications
Change condition to check for ReferenceCounted interface
Result
Better use of interfaces
Motivation:
`FormattingTuple.getArgArray()` is never used.
In the `MessageFormatter` it is possible to make
some improvements, e.g. replace `StringBuffer`
with `StringBuilder`, avoid redundant allocations, etc.
Modifications:
- Remove `argArray` field from the `FormattingTuple`.
- In `MessageFormatter`:
- replace `StringBuffer` with `StringBuilder`,
- replace `HashMap` with `HashSet` and make it lazy initialized.
- avoid redundant allocations (`substring()`, etc.)
- use appropriate StringBuilder's methods for the some `Number` values.
- Porting unit tests from `slf4j`.
Result:
Less GC load on logging with internal `MessageFormatter`.
Motivation:
IPv4/6 validation methods use allocations, which can be avoided.
IPv4 parse method use StringTokenizer.
Modifications:
Rewriting IPv4/6 validation methods to avoid allocations.
Rewriting IPv4 parse method without use StringTokenizer.
Result:
IPv4/6 validation and IPv4 parsing faster up to 2-10x.
Motivation:
UnixResolverDnsServerAddressStreamProvider allows the default name server address stream to be null, but there should always be a default stream to fall back to ([1] Search Strategy).
UnixResolverDnsServerAddressStreamProvider currently shuffles the names servers are multiple are present, but the defined behavior is to try them sequentially [2].
[1] Search Strategy Section - https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/resolver.5.html
[2] DESCRIPTION/nameserver Section - https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/resolver.5.html
Modifications:
- UnixResolverDnsServerAddressStreamProvider should always use the first file provided to derive the default domain server address stream. Currently if there are multiple domain names in the file identified by the first argument of the constructor then one will be selected at random.
- UnixResolverDnsServerAddressStreamProvider should return name servers sequentially.
- Reduce access level on some methods which don't have known use-cases externally.
Result:
Fixes https://github.com/netty/netty/issues/6736
Motivation:
MacOS will throw an error when attempting to set the IP_TOS socket option if IPv6 is available, and also when getting the value for IP_TOS.
Modifications:
- Socket#setTrafficClass and Socket#getTrafficClass should try to use IPv6 first, and check if the error code indicates the protocol is not supported before trying IPv4
Result:
Fixes https://github.com/netty/netty/issues/6741.
Motivation:
We not correctly handle LE buffers when try to read the packet length out of the buffer and just assume it always is a BE buffer.
Modifications:
Correctly account for the endianess of the buffer when reading the packet lenght.
Result:
Fixes [#6709].
Motivation:
We need to include the native modules on the bom to ensure there is no version missmatch.
Modifications:
Add native modules.
Result:
Fixes [#6738]
Motivation:
SslHandler#wrapNonAppData may be able to return early if it is called from a unwrap method and the status is NEED_UNWRAP. This has been observed to occur while using the OpenSslEngine and can avoid allocation of an extra ByteBuf of size 2048.
Modifications:
- Return early from SslHandler#wrapNonAppData if NEED_UNWRAP and we are called from an unwrap method
Result:
Less buffer allocations and early return from SslHandler#wrapNonAppData.
Motivation:
We should only try to load jdk.internal.misc.Unsafe if we run on Java9+ to eliminate noise in the log.
Modifications:
- Move javaVersion() and related methods to PlatformDependent0 to be able to use these in the static initializer without creating a cycle.
- Only try to load jdk.internal.misc.Unsafe when running in Java9+
Result:
Less noise in the log when running pre java9.
Motivation:
As we now include native code for multiple platforms we need to generate an uber all jar before release it from the staging repository. For this the uber-staging profile can be used. To create a snapshot uber jar the uber-snapshot profile can be used.
Modifications:
- Add uber-staging and uber-snapshot profile
- Correct comment in pom.xml file to show usage.
Result:
Easier to create snapshot and release uber jars.
Motivation:
A previous change allocated a new thread local string builder if it
was getting too large. This is a good change, these string builders
can accidentally get too large and then never shrunk and that is sort
of a memory leak. However, the change allocates an entirely new string
builder which is more allocations than necessary. Instead, we can trim
the string builder if its too large, this only allocates an extra
backing array instead of a whole new object.
Modifications:
If the string builder is above a threshold, we trim the string builder
and then ensure its capacity is reasonable to we do not allocate too
much as we start using the string builder.
Result:
The thread local string builder do not serve as a memory yet we do not
allocate too many new objects.
Motivation:
`NetUtil`'s methods `isValidIpV6Address` and `getIPv6ByName` incorrectly validate some IPv6 addresses.
Modifications:
- `getIPv6ByName`: add checks for single colon at the start or end.
- `isValidIpV6Address`: fix checks for the count of colons and use `endOffset` instead of `ipAddress.length()` for the cases with the brackets or '%'.
Result:
More correct implementation of `NetUtil#isValidIpV6Address` and `NetUtil#getIPv6ByName`.
Motivation:
To ensure the release plugin works correctly we need to ensure all modules are included during build.
Modification:
- Include all modules
- Skip compilation and tests for native code when not supported but still include the module and build the jar
Result:
Build and release works again
__Motivation__
`HttpClientCodec` skips HTTP decoding on the connection after a successful HTTP CONNECT response is received.
This behavior follows the spec for a client but pragmatically, if one creates a client to use a proxy transparently, the codec becomes useless after HTTP CONNECT.
Ideally, one should be able to configure whether HTTP CONNECT should result in pass-through or not. This will enable client writers to continue using HTTP decoding even after HTTP CONNECT.
__Modification__
Added overloaded constructors to accept `parseHttpPostConnect`. If this parameter is `true` then the codec continues decoding even after a successful HTTP CONNECT.
Also fixed a bug in the codec that was incrementing request count post HTTP CONNECT but not decrementing it on response. Now, the request count is only incremented if the codec is not `done`.
__Result__
Easier usage by HTTP client writers who wants to connect to a proxy but still decode HTTP for their users for subsequent requests.
Motivation:
ByteToMessageDecoder#handlerRemoved will immediately release the cumulation buffer, but it is possible that a child class may still be using this buffer, and therefore use a dereferenced buffer.
Modifications:
- ByteToMessageDecoder#handlerRemoved and ByteToMessageDecoder#decode should coordinate to avoid the case where a child class is using the cumulation buffer but ByteToMessageDecoder releases that buffer.
Result:
Child classes of ByteToMessageDecoder are less likely to reference a released buffer.
Motivation:
We only used the openssl version to detect if Ocsp is supported or not which is not good enough as even the version is correct it may be compiled without support for OCSP (like for example on ubuntu).
Modifications:
Try to enable OCSP while static init OpenSsl and based on if this works return true or false when calling OpenSsl.isOcspSupported().
Result:
Correctly detect if OSCP is supported.
Motivation:
Some JUnit assert calls can be replaced by simpler.
Modifications:
Replacement with a more suitable methods.
Result:
More informative JUnit reports.
Motivation:
In OpenSsl init code we create a SelfSignedCertificate which we not explicitly delete. This can lead to have the deletion delayed.
Modifications:
Delete the SelfSignedCertificate once done with it.
Result:
Fixes [#6716]
Motivation:
The javadocs for ByteBuf#ensureWritable(int, boolean) indicate that it should not throw, and instead the return code should indicate the result of the operation. Due to a bug in AbstractByteBuf it is possible for a resize to be attempted on a buffer that may exceed maxCapacity() and therefore throw.
Modifications:
- If there is not enough space in the buffer, and force is false, then a resize should not be attempted
Result:
AbstractByteBuf#ensureWritable(int, boolean) enforces the javadoc constraints and does not throw.
Motivation:
SSL_write requires a fixed amount of bytes for overhead related to the encryption process for each call. OpenSslEngine#wrap(..) will attempt to encrypt multiple input buffers until MAX_PLAINTEXT_LENGTH are consumed, but the size estimation provided by calculateOutNetBufSize may not leave enough room for each call to SSL_write. If SSL_write is not able to completely write results to the destination buffer it will keep state and attempt to write it later. Netty doesn't account for SSL_write keeping state and assumes all writes will complete synchronously (by attempting to allocate enough space to account for the overhead) and feeds the same data to SSL_write again later which results in corrupted data being generated.
Modifications:
- OpenSslEngine#wrap should only produce a single TLS packet according to the SSLEngine API specificaiton [1].
[1] https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/SSLEngine.html#wrap-java.nio.ByteBuffer:A-int-int-java.nio.ByteBuffer-
- OpenSslEngine#wrap should only consider a single buffer when determining if there is enough space to write, because only a single buffer will ever be consumed.
Result:
OpenSslEngine#wrap will no longer produce corrupted data due to incorrect accounting of space required in the destination buffers.
Motivation:
AtomicIntegerFieldUpdater#get is unnecessary, I think use simple volatile read is cleaner
Modifications:
Replace code STATE_UPDATER.get(this) to state in SingleThreadEventExecutor
Result:
Cleaner code
Motivation:
DefaultHttp2FrameWriter has constructors that it would be a hassle to
expose as configuration parameters on Http2Codec. We should instead
make a builder for Http2Codec.
Modifications:
Get rid of the public constructors on Http2Codec and instead make sure
you can always use the builder where you would have used the constructor
before.
Result:
Http2Codec can be configured more flexibly, and the SensitivityDetector
can be configured.
Motivation:
InternalThreadLocalMap#stringBuilder: ensure memory overhead
Modification:
If the capacity of StringBuilder is greater than 65536 then release it on the next time you get StringBuilder and re-create a StringBuilder.
Result:
Possible less memory usage.
Motivation:
IDN.toUnicode(...) removes trailing dots when used in Java7 while it not does on java8.
Modifications:
Check if we should test with the trailing dot removed or not.
Result:
Test pass on Java7 as well.
Motivation:
When adding SNIMatcher support we missed to use static delegating methods and so may try to load classes that not exists in Java7. Which will lead to errors.
Modifications:
- Correctly only try to load classes when running on java8+
- Ensure Java8+ related tests only run when using java8+
Result:
Fixes [#6700]
Motivation:
HttpServerKeepAliveHandler throws unexpected error when I do ctx.writeAndFlush(msg, ctx.voidPromise()); where msg is with header "Connection:close".
Modification:
HttpServerKeepAliveHandler does promise.unvoid() before adding close listener.
Result:
No error for VoidChannelPromise with HttpServerKeepAliveHandler. Fixes [#6698].
Motivation:
It would be more flexible to make getCharset and getMimeType code usable not only for HttpMessage entity but just for any CharSequence. This will improve usability in general purpose code and will help to avoid multiple fetching of ContentType header from a message. It could be done in an external code once and CharSequence method versions could be applied.
Modification:
Expose HttpUtil#getMimeType, HttpUtil#getCharsetAsString, HttpUtil#getCharset versions which works with CharSequence. New methods are reused in the old ones which work with HttpMessage entity.
Result:
More flexible methods set with a good code reusing.
Motivation:
If unsafe is unavailable, we can not use the cleaner anyway. If we try
to set it up, we get an annoying log message about unsafe being
unavailable (when debug logging is enabled). We know this will fail, so
we should not even bother and avoid the log message.
Modifications:
This commit adds a guard against setting up the cleaner if it is not
going to be available because unsafe is unavailable.
Result:
We do not try to set up the cleaner if unsafe is unavailable, and we do
not get an annoying log message.
Motivation:
Users should not see a scary log message when Netty is initialized if
Netty configuration explicitly disables unsafe. The log message that
produces this warning was previously guarded but the guard was
lost.
Modifications:
This commit brings back the guard against the scary log message if
unsafe is explicitly disabled.
Result:
No log message is produced when unsafe is unavailable because Netty was
told to not look for it.
Motivation:
WebSocket decoding throws exceptions on failure that should cause the
pipline to close. These are currently ignored in the
`WebSocketProtocolHandler` and `WebSocketServerProtocolHandler`. In
particular, this means that messages exceding the max message size will
cause the channel to close with no reported failure.
Modifications:
Re-fire the event just before closing the socket to allow it to be
handled appropriately.
Result:
Closes [#3063].
Motivation:
If Content-Encoding: IDENTITY is used we should not try to compress the http message but just let it pass-through.
Modifications:
Remove "!"
Result:
Fixes [#6689]
Motivation:
We currently don't have a native transport which supports kqueue https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2. This can be useful for BSD systems such as MacOS to take advantage of native features, and provide feature parity with the Linux native transport.
Modifications:
- Make a new transport-native-unix-common module with all the java classes and JNI code for generic unix items. This module will build a static library for each unix platform, and included in the dynamic libraries used for JNI (e.g. transport-native-epoll, and eventually kqueue).
- Make a new transport-native-unix-common-tests module where the tests for the transport-native-unix-common module will live. This is so each unix platform can inherit from these test and ensure they pass.
- Add a new transport-native-kqueue module which uses JNI to directly interact with kqueue
Result:
JNI support for kqueue.
Fixes https://github.com/netty/netty/issues/2448
Fixes https://github.com/netty/netty/issues/4231
This fixes#6652.
Rationale
The invocation of initChannel of ChannelInitializer has been moved to as
early as during handlerAdded is invoked in 26aa34853, whereas it was
only invoked during channelRegistered is invoked before that. So the
comment does not describe how handlers are added in normal circumstances
anymore.
However, the code is kept as-is since there might be unusual cases, and
adding ServerBootstrapAcceptor via the event loop is always safe to
enforce the correct order.
Motivation:
Fixes#6681.
Modification:
For the sake of better timer observability, expose the number of pending timeouts through the new HashedWheelTimer.pendingTimeouts method .
Result:
It's now ridiculously easy to observe Netty timer's very basic and yet important metric, the number of pending tasks/timeouts.
Motivation:
Conscrypt is not needed when using the handler module, so it should be marked as optional
Modifications:
Mark conscrypt as optional
Result:
Be able to use handler module without conscrypt
Motivation:
Uptime example is lack of server.
UptimeClient's code style is a little bit different from others, which make reader feel confused.
We don't need to create a new Bootstrap instance each time client reconnect to server.
Modification:
Add UptimeServer and UptimeServerHandler which simply accept all connection and discard all message.
Change UptimeClient's code style.
Share a single Bootstrap instance.
Result:
Uptime server support.
Consistent code style.
Single Bootstrap for all reconnection.
Motivation:
NetUtil#isValidIpV6Address and NetUtil#getIPv6ByName allowed an invalid form of mapped IPv4 addresses which lead to accepting invalid IPv6 addresses as valid.
Modifications:
- NetUtil#isValidIpV6Address and NetUtil#getIPv6ByName should only allow 7 colons for an IPv4 address if they are the first 2 characters.
Result:
More correct implementation of NetUtil#isValidIpV6Address and NetUtil#getIPv6ByName
It is generally useful to have origin http servers respond to
"expect: continue-100" as soon as possible but applications without a
HttpObjectAggregator in their pipelines must use boiler plate to do so.
Modifications:
Introduce the HttpServerExpectContinueHandler handler to make it easier.
Result:
Less boiler plate for http application authors.
Motivation:
DiskFileUpload creates temporary files for storing user uploads containing the user provided file name as part of the temporary file name. While most security problems are prevented by using "new File(userFileName).getName()" a small risk for bugs or security issues remains.
Modifications:
Use a constant string as file name and rely on the callers use of File.createTemp to ensure unique disk file names.
Result:
A slight security improvement at the cost of a little more obfuscated temp file names.
Motivation:
A single DNS query may follow many different paths through resolver-dns. The query may fail for various reasons related to the DNS protocol, general IO errors, it may be cancelled due to the query count being exceeded, or other reasons. A query may also result in other queries as we follow the DNS protocol (e.g. redirects, CNAME, etc...). It is currently impossible to collect information about the life cycle of an individual query though resolver-dns. This information may be valuable when considering which DNS servers are preferred over others.
Modifications:
- Introduce an interface which can provide visibility into all the potential outcomes of an individual DNS query
Result:
resolver-dns provides visibility into individual DNS queries which can be used to avoid poorly performing DNS servers.
