Start a changelog for Arti 0.2.0
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CHANGELOG.md
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CHANGELOG.md
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### Notes
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This file describes changes in Arti through the current release. Once Arti
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is more mature, and we start to version crates independently, we will
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probably switch to using a separate changelog for each crate.
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is more mature, and we start to version crates independently, we may
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switch to using a separate changelog for each crate.
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# Arti 0.2.0 — XXXX Apr 2022
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BLURB
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(entries below are taken through 482b2e3256cc0c738dc1deb3029173b8619920dd)
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### Breaking changes
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Here are the main breaking changes visible from the arti-client crate.
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Numerous other lower-level crates have breaking changes not noted here.
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- Significant refactoring to our configuration handling logic and APIs.
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The goals here are:
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- To have the current `ConfigBuilder` types
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become the only user-visible configuration objects, and to have the
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current `Config` objects become implementation details.
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- To remove `arti-config` entirely, and fold its contents into
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`arti` or `arti-client` as appropriate.
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- To remove unnecessary ad-hoc accessor functions until they prove to be
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needed.
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This change
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is not done in this release; we expect to have more breakage
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in this area in our next release as well. ([#314], [#371], [#372],
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[#374], [#396], [#418],
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[!391], [!401], [!417], [!421], [!423], [!425], [!427])
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- The [`Runtime`] trait now includes (and requires) UDP support. (Part
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of [!390]'s support for DNS.)
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- Stream isolation support is completely revised; see notes on isolation
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below.
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### New features
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- Experimental feature to allow the [`DirMgr`] to be replaced by
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a user-provided [`DirProvider`]. ([#267], [!318], [!347])
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- Arti now tolerates IPv6-only environments, by using a basic form of
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the [RFC 8305] "happy eyeballs" algorithm to try connections to
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relays' IPv4 and IPv6 addresses in parallel. ([!382])
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- New experimental APIs for modifying consensus objects ([!318], [!402])
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- The `arti` crate now exists as a library, to better expose features
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like its top-level configuration logic. ([!403])
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- Arti now supports a `dns_port` to relay A, AAAA, and PTR requests over
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the Tor network, like the C tor implementation's DnsPort. ([!390],
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[!408], [!409])
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- Arti has a new full-featured [stream isolation API] that supports more
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complicated isolation rules, including user-supplied rules. ([#150],
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[#414], [!377], [!418], [!420], [!429], [!434])
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- Channel and Circuit objects now remember the peers that they used
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when they were constructed, and allow queries of this information as
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part of their API. ([#415])
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- The logic for retrying failed guards has been revised to use
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the same decorrelated-jitter algorithm as directory requests, per
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[proposal 336]. ([cb103e04cf4d9853], part of [#407], [!426])
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- When all our guards have failed, we no longer retry them all
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agressively, but rather assume that our net connection is down and
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wait a while. ([eed1f06662366511], part of [#407], [!426])
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- When running as a directory client, we now remember more information
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about the source of each request, so we can avoid caches that have
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failed. ([87a3f6b58a5e75f7])
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- Experimental feature to install a "filter" for modifying incoming
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directory objects. Used for testing, to observe client behavior when
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the directory is in an inconsistent or non-working state. ([#397], [!431])
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- Arti now has initial support for a "Dormant Mode" where periodic events are
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suspended. Later, even more background tasks will be shut
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down. ([#90], [!429])
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### Major bugfixes
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### Infrastructure
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- We have a new [`arti-testing`] crate (not published on crates.io) to
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perform various kinds of stress-testing on our implementation. It can
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simulate several kinds of failure and overload conditions; we've been
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using it to improve Arti's behavior when the network is broken or
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misbehaving. ([!378], [!392]; see also [#329])
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- The [`arti-bench`] tool now constructs streams in parallel and
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supports isolated circuits, so we can
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stress-test the performance of a simulated busy client. ([#380], [!384])
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- Reproducible build scripts now use Rust 1.59 and Alpine 3.15. ([#376],
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[!380])
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- Improved messages from reproducible build script. ([#378], [!383])
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- Scripts to launch chutney are now refactored and de-duplicated ([!396])
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### Documentation and Examples
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- Better documentation for default configuration paths. ([!386])
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- Instructions for using Tor Browser with Arti on Windows. ([!388])
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- Better instructions for building Arti on Windows. ([!389], [!393])
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- Improved documentation for stress-testing Arti. ([!407])
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### Cleanups, minor features, and minor bugfixes
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- Use [`derive_more`] and [`educe`] (and simple built-in `derive`) in
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many places to simplify our code. ([!374], [!375])
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- Use a [forked version of `shellexpand`] to provide correct behavior on
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Windows. ([!274], [!373])
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- Avoid unnecessary `Arc::clone()`s in `arti-client` experimental
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APIs. ([#369], [!379])
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- New [`tor-basic-utils`] crates for small pieces of low-level
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functionality.
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- Small performance improvements to parsing and allocating directory objects,
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to improve start-up and download times. ([#377], [!381])
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- Use significantly less memory (on the order of a few megabytes less per
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running client) to store directory objects. ([#384], [#385], [#386], [#387],
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[#388], [!389], [!398], [!415])
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- Avoid allocating a backtrace object for each channel-creation
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attempt. ([#383], [!394])
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- Always send an "If-Modified-Since" header on consensus requests, since
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we wouldn't want a consensus that was far too old. ([#403], [!412])
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- Actually acknowledge preemptive circuits configuration. Previously,
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we missed a place where we needed to copy it. (Part of [!417])
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- Backend support for collecting clock skew information; not yet
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used. ([#405], [!410])
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- Major refactoring for periodic events, to support an intial version of
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"dormant mode." ([!429])
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### Acknowledgments
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XXXXXXXXXXXXXXXXXXXXXXX
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# Arti 0.1.0 — 1 Mar 2022
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