Because the old case didn't account for the Scheduler got dropped but Participant keept around.
Shutdown behavior is quite easy now: bParticipant sends a oneshot, when that hits we stop. also when Participant gets droped we still stop as there woul dbe no sense in continue running the report_mgr ...
This will ask the bparticipant for a list of all channels and their respective connection arguments.
With that one could prob reach the remote side.
The data is gathered by scheduler (or channel for the listener code).
It requeres some read logs so we shouldn't abuse that function call.
in bparticipant we have a new manager that also properly shuts down as the Participant holds the sender to the respective receiver.
The sender is always dropped. inside the Mutex via disconnect and outside via Drop (we need 2 Options as otherwise we would create a runtime inside async context implicitly o.O )
(also i didn't liked the alternative by just overwriting the sender with a fake one, i want a propper Option that can be taken)
The code might also come handy in the future when we implement a auto-reconnect feature in the bparticipant.
The security model has been updated to reflect this change (for example,
moderators cannot revert a ban by an administrator). Ban history is
also now recorded in the ban file, and much more information about the
ban is stored (whitelists and administrators also have extra
information).
To support the new information without losing important information,
this commit also introduces a new migration path for editable settings
(both from legacy to the new format, and between versions). Examples
of how to do this correctly, and migrate to new versions of a settings
file, are in the settings/ subdirectory.
As part of this effort, editable settings have been revamped to
guarantee atomic saves (due to the increased amount of information in
each file), some latent bugs in networking were fixed, and server-cli
has been updated to go through StructOpt for both calls through TUI
and argv, greatly simplifying parsing logic.
- locally we open a stream, our local Drain is sending OpenStream
- remote Sink will know this and notify remote Drain
- remote side sends a message
- local sink does not know about the Stream. as there is (and CANT) be a wat to notify local Sink from local Drain (it could introduce race conditions).
One of the possible solutions was, that the remote drain will copy the OpenStream Msg ON the Quic::stream before first data is send. This would work but is complicated.
Instead we now just mark such streams as "potentially open" and we listen for the first DataHeader to get it's SID.
add support for unreliable messages in quic protocol, benchmarks
Its available to `api` and `metrics` and can be used to slow down msg send in veloren.
It uses a tokio::watch for now, as i plan to have a watch job in the scheduler that recalculates prio on change.
Also cleaning up participant metrics after a disconnect
When a stream is opened we are searching for the best (currently) available channel.
The stream will then be keept on that channel.
Adjusted the rest of the algorithms that they now respect this rule.
improved a HashMap for Pids to be based on a Vec. Also using this for Sid -> Cid relation which is more performance critical
WARN: our current send()? error handling allows it for some close_stream messages to get lost.
- now last digit version is compatible 0.6.0 will connect to 0.6.1
- the TCP DATA Frames no longer contain START field, as it's not needed
- the TCP OPENSTREAM Frames will now contain the BANDWIDTH field
- MID is not Protocol internal
Update network
- update API with Bandwidth
Update veloren
- introduce better runtime and `async` things that are IO bound.
- Remove `uvth` and instead use `tokio::runtime::Runtime::spawn_blocking`
- remove futures_execute from client and server use tokio::runtime::Runtime instead
- give threads a Name
- a channel was stale and wasn't shut down propertly AS WELL AS
- the msg ingoing pipe was bounded, so it could fill up
To mitigate this we
a) unbounded the pipe
b) stoped spam the log in no channel case
c) instead of ever reaching "no channel" state we actually shutdown participant
d) when send_mgr is closed it will no longer be able to SEND on streams
- completly switch to Bytes, even in api. speed up TCP by fak 2
- improve benchmarks
- speed up mpsc metrics
- gracefully handle shutdown by interpreting Ok(0) as tokio::tcpstream closed now.
- fix hotloop in participants by adding `Some(n)` to fix endless handing.
- fix closing bug by closing streams after `recv_mgr` is shutdown even if now shutdown is triggered locally.
- fix prometheus
- no longer throw when a `Stream` is dropped while participant still receives a msg for it.
- fix the bandwith handling, TCP network send speed is up to 1.5GiB/s while recv is 150MiB/s
- add documentation
- tmp require rt-multi-threaded in client for tokio, to not fail cargo check
this is prob stable, i tested over 1 hour.
after that some optimisations in priomgr.
and impl. propper bandwith.
Speed is up to 2GB/s write and 150MB/s recv on a single core
sync add documentation
- better logging in network
- we now notify the send of what happened in recv in participant.
- works with veloren master servers
- works in singleplayer, using a actual mid.
- add `mpsc` in whole stack incl tests
- speed up internal read/write with `Bytes` crate
- use `prometheus-hyper` for metrics
- use a metrics cache
- Implementing a async non-io protocol crate
a) no tokio / no channels
b) I/O is based on abstraction Sink/Drain
c) different Protocols can have a different Drain Type
This allow MPSC to send its content without splitting up messages at all!
It allows UDP to have internal extra frames to care for security
It allows better abstraction for tests
Allows benchmarks on the mpsc variant
Custom Handshakes to allow sth like Quic protocol easily
- reduce the participant managers to 4: channel creations, send, recv and shutdown.
keeping the `mut data` in one manager removes the need for all RwLocks.
reducing complexity and parallel access problems
- more strategic participant shutdown. first send. then wait for remote side to notice recv stop, then remote side will stop send, then local side can stop recv.
- metrics are internally abstracted to fit protocol and network layer
- in this commit network/protocol tests work and network tests work someway, veloren compiles but does not work
- handshake compatible to async_std
switch to `tokio` and `async_channel` crate.
I wanted to do tokio first, but it doesnt feature Sender::close(), thus i included async_channel
Got rid of `futures` and only need `futures_core` and `futures_util`.
Tokio does not support `Stream` and `StreamExt` so for now i need to use `tokio-stream`, i think this will go in `std` in the future
Created `b2b_close_stream_opened_sender_r` as the shutdown procedure does not need a copy of a Sender, it just need to stop it.
Various adjustments, e.g. for `select!` which now requieres a `&mut` for oneshots.
Future things to do:
- Use some better signalling than oneshot<()> in some cases.
- Use a Watch for the Prio propergation (impl. it ofc)
- Use Bounded Channels in order to improve performance
- adjust tests coding
bring tests to work
But i have the feeling that maybe something with the channel is wrong which leads to this behavior (or maybe did i made a copy somewhere, though i dobt this).
Again, not sure if this is a fix, but i think it doesn't hurt
There is a rare bug that recently got triggered more often with the release of xMAC94x/netfixA
if the bug triggeres, a Participant never gets cleaned up gracefully.
Reason:
When `participant_shutdown_mgr` was called it stopped all managers at once.
Especially stream_close_mgr and send_mgr.
The problem with stream_close_mgr is, it's responsible for gracefully flushing streams when the Participant is dropped locally.
So when it was interupted self.streams where no longer flushed gracefully.
The next problem was with send_mgr.
It is triggering the PrioManager, and the PrioManager is responsible for notifying once a stream is completly flushed.
This lead to the problem, that a stream flush could be requested, but was actually never executed (as send_mgr was already down).
Solution:
1. when stream_close_mgr is stopped it MUST flush all remaining streams
2. wait for stream_close_mgr to finish before shutting down the send_mgr
3. no longer delete streams when closing the API (this also wasn't tracked in metrics so far)
Additionally i added a dependency, so that the network/examples compile again, fixed some spelling.
I created a `delete_stream` fn that basically just moved the code over.
- first remove participant AND channel in same metric. this caused a matrix full of 0 values which bloated alot.
- then did the cid cache to be lazy loading to no longer generate that much 0 values
- possible would also be no longer keeping metrics for INIT, HANDSHAKE and PARTICIPANTID
- When Participant A was closed by remote side. Then a `disconnect` on `A`
shall return Ok() (instead of ParticipantDisconected) IF:
A was already flushed and no data needs to be sended any more.
so a `disconnect` doesnt differ if the other side initiated the disconnect before or not. it tries to clean things up and returns Ok(()) if both sides agree
- It was possible for a end_receiver to be triggered in the moment while a frame was started by not finished.
This removed bytes from the stream with them getting lost. this almost ever was followed by a RAW frame as the TCP stream was now invalid.
The TCP stream was then detected by participant or caused one or multiple failures
- introduces some simplifications, removed a macro, reuse code
- replace RwLock by Mutex if it's only accessed for insert/delete
- use RwLock<HashMap<Mutex>> pattern otherwise in order to allow concurrent `.read()`
- fixed a deadlock O.o
Till now, we just dropped the TCP connection and registered this as a clean shutdown.
The prodocol reader intereted this and send a Frame::Shutdown frame to it's local processor.
This is ofc wrong.
So now the protocol reader will detect a Frame::Shutdown frame and send it over. if the Tcp connection gets closed it will return an Error up.
The processor will then pick up this error and request a unclear shutdown and notifies the user.
Also when doing a clean shutdown we are sending a Frame::Shutdown now to the remote side to trigger this behavior.
Before we wrongly added the feature of only using a `select` in channel. This is WRONG,
as it could mean that the write maybe fails, but the read still had some Frames buffered which then get dropped.
Its fixed now by the clean shutdown mechanims defined before.
Also when a channel is closed now inside a participant we are closing the whole participant as a protection.
However, we must not close the recv channel as the `handle_frames_mgr` might still be working on them, so we only stop writing/sending.
Debugging this also let me introduce some smaller fixes:
- PID in tests are now 0 and 1+1*64+1*64*64+... this makes the traces appear as AAAAAA and BBBBBB instead of ABAAAA and ACAAAA
- veloren client now better seperates between clean shutdown and unclear shutdown.
- added a new type: C2pFrame for `(cid, Result<Frame, ()>)`
- wrong frames inside the handshare are not counted in metrics
-
added a span for disconnecting on the gameserver side. also added more debug! tracing there
Just keeping a trace! all 10000ms active to have a keep alive feeling.
Participant will now handle a close in the `create_channel_mgr` rather then the `send` fn. Its the better place, which makes a HashMap better for delete lookup
Since tcp_read now broke but tcp_write didn't and the Participant wasnt updated till both were broke, we changed CHANNEL tcp_read and tcp_write in protocols to be a `select` rather than a `join`
However only do this in the CHANNEL, but in the HANDSHAKE. it fails if you try to. Also the handshake will take care of any failed read or write manually and will handle a clear teardown in this case.
increase the slowlorris timeout. for some reason it seems to trigger alot more often since commit: `75c1d440` but i have no idea why.
My guess would be that the initial sync now sends way more data which slows down TCP to be > 10ms and trigger. Note: the fix might cause small lags when slow people try to connect to the server
The remote site should see it connect, be open for 1 single stream and read the message before it's notified that the participant is closed actually.
This caused the faulure in one of our API tests (in lib, with client and server). Where it was possible that all messages were send and one side was dropped before the other side asked for the opened stream
Also introduce better error detection in participant(and scheduler) by removing the std_async::Result and intruduce `Result<(),ParticipantError>` instead
