1 Star 0 Fork 349

liumxqt / workflow

forked from 搜狗开源 / workflow 
Create your Gitee Account
Explore and code with more than 12 million developers,Free private repositories !:)
Sign up
Clone or Download
contribute
Sync branch
Cancel
Notice: Creating folder will generate an empty file .keep, because not support in Git
Loading...
README
Apache-2.0

中文版入口

Sogou C++ Workflow

License Language Platform Build Status

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:
#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.
  • To implement client/server on user-defined protocol and build your own RPC system.
    • 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.
    • The workflow-k8s plugin enables using name service with Kubernetes automated deployment.
  • Wiki link : PaaS Architecture

Compiling and running environment

  • This project supports Linux, macOS, Windows, Android and other operating systems.
    • Windows version is currently released as an independent branch, using iocp to implement asynchronous networking. All user interfaces are consistent with the Linux version.
  • Supports all CPU platforms, including 32 or 64-bit x86 processors, big-endian or little-endian arm processors, loongson processors.
  • Relies on OpenSSL; OpenSSL 1.1 and above is recommended. If you don't like SSL, you may checkout the nossl branch. But still need to link crypto for md5 and sha1.
  • Uses the C++11 standard and therefore, it should be compiled with a compiler which supports C++11. Does not rely on boost or asio.
  • No other dependencies. However, if you need Kafka protocol, some compression libraries should be installed, including lz4, zstd and snappy.

Get started (Linux, macOS):

git clone https://github.com/sogou/workflow
cd workflow
make
cd tutorial
make

Get started (Debian Linux):

Sogou C++ Workflow has been packaged for Debian. It is currently in Debian sid (unstable) but will eventually be placed into the stable repository.

In order to access the unstable repository, you will need to edit your /etc/apt/sources.list file.

Simply add the 'unstable' sub branch to your repo:

deb http://deb.debian.org/ main contrib non-free 
--> 
deb http://deb.debian.org/ unstable main contrib non-free

Once that is added, update your repo list and then you should be able to install it:

sudo apt-get update

To install the Workflow library for development purposes:

sudo apt-get install libworkflow-dev

To install the Workflow library for deployment:

sudo apt-get install libworkflow1

Tutorials

System design features

We believe that a typical back-end program=protocol+algorithm+workflow and should be developed completely independently.

  • Protocol
    • In most cases, users use built-in common network protocols, such as HTTP, Redis or various rpc.
    • Users can also easily customize user-defined network protocol. In the customization, they only need to provide serialization and deserialization functions to define their own client/server.
  • Algorithm
    • In our design, the algorithm is a concept symmetrical to the protocol.
      • If protocol call is rpc, then algorithm call is an apc (Async Procedure Call).
    • We have provided some general algorithms, such as sort, merge, psort, reduce, which can be used directly.
    • Compared with a user-defined protocol, a user-defined algorithm is much more common. Any complicated computation with clear boundaries should be packaged into an algorithm.
  • Workflow
    • Workflow is the actual business logic, which is to put the protocols and algorithms into the flow graph for use.
    • The typical workflow is a closed series-parallel graph. Complex business logic may be a non-closed DAG.
    • The workflow graph can be constructed directly or dynamically generated based on the results of each step. All tasks are executed asynchronously.

Basic task, task factory and complex task

  • Our system contains six basic tasks: networking, file IO, CPU, GPU, timer, and counter.
  • All tasks are generated by the task factory and automatically recycled after callback.
    • Server task is one kind of special networking task, generated by the framework which calls the task factory, and handed over to the user through the process function.
  • In most cases, the task generated by the user through the task factory is a complex task, which is transparent to the user.
    • For example, an HTTP request may include many asynchronous processes (DNS, redirection), but for user, it is just a networking task.
    • File sorting seems to be an algorithm, but it actually includes many complex interaction processes between file IO and CPU computation.
    • If you think of business logic as building circuits with well-designed electronic components, then each electronic component may be a complex circuit.

Asynchrony and encapsulation based on C++11 std::function

  • Not based on user mode coroutines. Users need to know that they are writing asynchronous programs.
  • All calls are executed asynchronously, and there is almost no operation that occupies a thread.
    • Although we also provide some facilities with semi-synchronous interfaces, they are not core features.
  • We try to avoid user's derivations, and encapsulate user behavior with std::function instead, including:
    • The callback of any task.
    • Any server's process. This conforms to the FaaS (Function as a Service) idea.
    • The realization of an algorithm is simply a std::function. But the algorithm can also be implemented by derivation.

Memory reclamation mechanism

  • Every task will be automatically reclaimed after the callback. If a task is created but a user does not want to run it, the user needs to release it through the dismiss method.
  • Any data in the task, such as the response of the network request, will also be recycled with the task. At this time, the user can use std::move() to move the required data.
  • SeriesWork and ParallelWork are two kinds of framework objects, which are also recycled after their callback.
    • When a series is a branch of a parallel, it will be recycled after the callback of the parallel that it belongs to.
  • This project doesn’t use std::shared_ptr to manage memory.

Any other questions?

You may check the FAQ and issues list first to see if you can find the answer.

You are very welcome to send the problems you encounter in use to issues, and we will answer them as soon as possible. At the same time, more issues will also help new users.

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. "Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution." "Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work. 2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form. 3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. 4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions: (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and (b) You must cause any modified files to carry prominent notices stating that You changed the files; and (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License. You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License. 5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file. 7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

About

C++并行计算与异步网络引擎 ⭐️⭐️⭐️ expand collapse
C++
Apache-2.0
Cancel

Releases

No release

Contributors

All

Activities

Load More
can not load any more
C++
1
https://gitee.com/liumxqt/workflow.git
git@gitee.com:liumxqt/workflow.git
liumxqt
workflow
workflow
master

Search