2.7

Changes since v2.6:

• Logging in JSON format was implemented. See static option format at components::Logging.

• utils::regex now uses Re2 under the hood, leading to at least x2 faster regular expression matching and guaranteed absence of backtracking. Updating is highly recommended.

• Mongo connection state checking algorithms was adjusted to work well on small RPS.

• Conan packages now support all the userver features. Conan package build now reuses the CMake install targets and CMake config files.

• Full feature support for MacOS, including testing and Conan package build and usage on that platform.

• Added support for TLS certificate chains. See tls.cert static option at components::Server. Many thanks to aklyuchev for the PR!

• Chaotic exceptions now do not depend on JSON. Thanks to Artyom for the PR!

• gRPC

  • Out-the-box cache dump support for Protobuf messages. See Implementing serialization (Write / Read) for more info.
  • Removed deprecated *Sync methods.

• Optimizations

  • Speed up configuration reads on creating new PostgreSQL connections.
  • utils::PeriodicTask now calls RCU Read two times less on each iteration.
  • Reduced memory allocations count on each Redis request.

• Build

  • New Mongo+gRPC service template. Many thanks to Alexander Kuvaev for the PR!
  • Fixed build with USERVER_FEATURE_JEMALLOC=ON. Many thanks to Aleksey Ignatiev
    for the PR!
  • Service templates service_template, pg_service_template, pg_grpc_service_template, mongo_grpc_service_template now use "cmake presets" and "devcontainers" for out-of-the-box support of VSCode and Clion IDEs.
  • Started the work on Ubuntu 24.04 images.
  • Added ubuntu-22.04-userver-pg-dev image with all the tools for development. Planning to switch to Ubuntu-24.04 and leave only 2 containers: with build dependencies to build userver, and with prebuild userver.
  • Added missing fmt11 headers. Thanks to Pavel Sidorovich for the PR!
  • Added USERVER_USE_STATIC_LIBS to link third-party libraries statically.
  • Support pacman epoch in CMake version detection. Many thanks to Konstantin Goncharik for the PR.

• Documentation

  • Significant update of the Configure, Build and Install
  • More docs for tracing::Span::SetLogLevel() and tracing::Span::SetLocalLogLevel()
  • Fixed secdist example at components::Mongo. Thank to Nikita Puteev for the PR!
  • Highlight the functionality of formats::common::Items in each supported format.
  • Add info about full static linkage. Thanks to Nikita for the PR!
  • Better runtests documentation at Functional service tests (testsuite)
  • Documentation and samples for storages::postgres::io::Codegen{}.