workflow

[简体中文版（推荐）](README_cn.md)

## Sogou C++ Workflow

[![License](https://img.shields.io/badge/License-Apache%202.0-green.svg)](https://github.com/sogou/workflow/blob/master/LICENSE)
[![Language](https://img.shields.io/badge/language-c++-red.svg)](https://en.cppreference.com/) 
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[![Build Status](https://img.shields.io/github/actions/workflow/status/sogou/workflow/ci.yml?branch=master)](https://github.com/sogou/workflow/actions?query=workflow%3A%22ci+build%22++)

As **Sogou\`s C++ server engine**, Sogou C++ Workflow supports almost all **back-end C++ online services** of Sogou, including all search services, cloud input method, online advertisements, etc., handling more than **10 billion** requests every day. This is an **enterprise-level programming engine** in light and elegant design which can satisfy most C++ back-end development requirements.

#### You can use it:

* To quickly build an **HTTP server**:

~~~cpp
#include <stdio.h>
#include "workflow/WFHttpServer.h"

int main()
{
    WFHttpServer server([](WFHttpTask *task) {
        task->get_resp()->append_output_body("<html>Hello World!</html>");
    });

    if (server.start(8888) == 0) { // start server on port 8888
        getchar(); // press "Enter" to end.
        server.stop();
    }

    return 0;
}
~~~

* As a **multifunctional asynchronous client**, it currently supports `HTTP`, `Redis`, `MySQL` and `Kafka` protocols.
  * ``MySQL`` protocol supports ``MariaDB``, ``TiDB`` as well.
* To implement **client/server on user-defined protocol** and build your own **RPC system**.
  * [srpc](https://github.com/sogou/srpc) is based on it and it is an independent open source project, which supports srpc, brpc, trpc and thrift protocols.
* To build **asynchronous workflow**; support common **series** and **parallel** structures, and also support any **DAG** structures.
* As a **parallel computing tool**. In addition to **networking tasks**, Sogou C++ Workflow also includes **the scheduling of computing tasks**. All types of tasks can be put into **the same** flow.
* As an **asynchronous file IO tool** in `Linux` system, with high performance exceeding any system call. Disk file IO is also a task.
* To realize any **high-performance** and **high-concurrency** back-end service with a very complex relationship between computing and networking.
* To build a **micro service** system.
  * This project has built-in **service governance** and **load balancing** features.
* Wiki link : [PaaS Architecture](https://github.com/sogou/workflow/wiki)

#### Compiling and Running Environment

* This project supports `Linux`, `macOS`, `Windows`, `Android` and other operating systems.
  * `Windows` version is currently released as an independent [branch](https://github.com/sogou/workflow/tree/windows), using `iocp` to implement asy