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https://github.com/userver-framework/userver

Production-ready C++ Asynchronous Framework with rich functionality
https://github.com/userver-framework/userver

async asynchronous coroutines cplusplus cplusplus-17 cpp17 database-access framework grpc high-availability http http-client http-server microservices mongo postgres postgresql redis server web

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Production-ready C++ Asynchronous Framework with rich functionality

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# userver [](https://userver.tech/)



| Service Templates | Develop / Green Trunk  | v1.0 |

|------------------------|-----|-----|

| Core: | [![CI](https://github.com/userver-framework/service_template/actions/workflows/ci.yml/badge.svg) ![Docker build](https://github.com/userver-framework/service_template/actions/workflows/docker.yaml/badge.svg)](https://github.com/userver-framework/service_template/) | [[âžš]](https://github.com/userver-framework/service_template/tree/v1.0.x) |

| PostgreSQL: | [![CI](https://github.com/userver-framework/pg_service_template/actions/workflows/ci.yml/badge.svg) ![Docker build](https://github.com/userver-framework/pg_service_template/actions/workflows/docker.yaml/badge.svg)](https://github.com/userver-framework/pg_service_template/) | [[âžš]](https://github.com/userver-framework/pg_service_template/tree/v1.0.x) |

| gRPC+PostgreSQL: | [![CI](https://github.com/userver-framework/pg_grpc_service_template/actions/workflows/ci.yml/badge.svg) ![Docker build](https://github.com/userver-framework/pg_grpc_service_template/actions/workflows/docker.yaml/badge.svg)](https://github.com/userver-framework/pg_grpc_service_template) | [[âžš]](https://github.com/userver-framework/pg_grpc_service_template/tree/v1.0.x) |



**userver** is an open source asynchronous framework with a rich set of abstractions

for fast and comfortable creation of C++ microservices, services and utilities.



The framework solves the problem of efficient I/O interactions transparently for

the developers. Operations that would typically suspend the thread of 

execution do not suspend it. Instead of that, the thread processes other

requests and tasks and returns to the handling of the operation only when it is

guaranteed to execute immediately: 



```cpp

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();

}

```



As a result, with the framework you get straightforward source code,

avoid CPU-consuming context switches from OS, efficiently

utilize the CPU with a small amount of execution threads.



You can learn more about history and key features of userver from our articles 

on [Medium](https://medium.com/p/d5d9c4204dc2) (English) 

or [Habr](https://habr.com/post/674902) (Russian).



## Other Features



* Efficient asynchronous drivers for databases (MongoDB, PostgreSQL, Redis,

  ClickHouse, MySQL/MariaDB (experimental) ...) and data transfer protocols

  (HTTP, gRPC, AMQP 0-9-1 (experimental), TCP, TLS, WebSocket ...), tasks

  construction and cancellation.

* Rich set of high-level components for caches, tasks, distributed locking,

  logging, tracing, statistics, metrics, JSON/YAML/BSON.

* Functionality to change the service configuration on-the-fly.

* On-the-fly configurable drivers, options of the deadline propagation,

  timeouts, congestion-control.

* Comprehensive set of asynchronous low-level synchronization primitives and

  OS abstractions. 



[See the docs for more info](https://userver.tech/de/d6a/md_en_2index.html).