The C++ Asynchronous Framework

🐙 userver is the modern open source asynchronous framework with a rich set of abstractions for fast and comfortable creation of C++ microservices, services and utilities. The problem of efficient I/O interactions is solved transparently for the developers:

 std::size_t Ins(storages::postgres::Transaction& tr, std::string_view key) { 
  // Asynchronous execution of the SQL query in transaction. Current thread 
  // handles other requests while the response from the DB is being received: 
  auto res = tr.Execute("INSERT INTO keys VALUES ($1)", key); 
  return res.RowsAffected(); 
 } 

Micro-services based on userver served more than a billion requests while you were reading this sentence.

Technologies for debugging and memory profiling a running production service.

Write your first toy C++ service, evolve it into a production ready service.

Efficient asynchronous drivers for databases (MongoDB, PostgreSQL, MySQL/MariaDB (experimental), Redis, ClickHouse, ...) and data transfer protocols (HTTP, WEbSockets, gRPC, TCP, AMQP-0.9.1 (experimental), ...), tasks construction and cancellation.

Functionality to change the service configuration on-the-fly. Adjust options of the deadline propagation, timeouts, congestion-control without a restart.

Rich set of high-level components for caches, tasks, distributed locking, logging, tracing, statistics, metrics, JSON/YAML/BSON.

Comprehensive set of asynchronous low-level synchronization primitives and OS abstractions.

Speed of C++, simplicity of Python.

Dive into the documentation for more details.