2.5

Changes since v2.4:

• Added S3 API client s3api::Client. Many thanks to v-for-vandal for the work!

• Added gRPC reflection library. Many thanks to v-for-vandal for the work!

• Added Kill Switch functionality. Many thanks to Aksenov Anton for the work!

• Congestion Control turned on by default.

• Initial work towards embedding GDB pretty-printers to userver binaries.

• Mongo now has the full functionality for diagnostics out-of-the box, without mongo-c library patches.

• Simplified contributing by removing the annoying bot that checks for explicit agreement to CLA. Creating an issue or sending a PR already means agreement with CLA. Added notes to PR and Issue creation to highlight that.

• Basic support for HTTP/2 body streaming.

• Kafka support in testsuite implemented. See Functional tests section at Kafka service tutorial.

• gRPC:

  • Safe new interface for gRPC server handlers. Old interface will be removed in next release.
  • Added support for TLS in gRPC.
  • Added ugrpc::server::middlewares::field_mask::Component for masking and trimming messages. Many thanks to TTPO100AJIEX for the work!
  • gRPC clients now allow configuring channels count for particular methods via dedicated-channel-counts static config option.

• Optimizations:

  • concurrent::MpscQueue was optimized, leading to x2-x3 better performance.
  • rcu::Variable deleter now can be chosen at compile time, leading to smaller size of rcu::Variable if no asynchronous deletion required.
  • Multiple optimizations for gRPC logging and message visitations via ugrpc::VisitFieldsRecursive(). Many thanks to TTPO100AJIEX for the work!

• Build:

  • Added userver_module() CMake function to simplify configuration of new drivers that are being added to userver.
  • Added missing fmt/ranges.h includes. Thanks to Vasilii Kuziakin and to SidorovichPavel for the PRs!
  • Proper use of PROTOBUF_PROTOC in CMake. Thanks to Nikita for the PR!
  • Added support for builds in paths that contain whitespaces and other special symbols.
  • Added CI build tests for Ubuntu 24.04 and MacOS.
  • Switched to Conan v2. Many thanks to Anton for the PR! Also use modern versions of third party libraries in Conan.

• Documentation and diagnostics:

  • A whole new build dedicated section was added to the docs instead of the old "Configure, Build and Install" page.
  • Improved schemes validation messages, including config validation messages because no schema is written.
  • Disambiguated diagnostic messages for component system.
  • Better log messages for the dist locks.
  • Better docs for gRPC middlewares and gRPC logs at gRPC.
  • Added topology and heartbeats logs and metrics for Mongo.
  • Clarified docs on PostgreSQL data types with timezones. See uPg: Supported data types.
  • Added Kafka service tutorial.
  • Logging at runtime, Congestion Control documentation rewrite.