Preface

today , We are pleased to announce CAP Release 6.1 Version official , In this version, we mainly focus on the several BUG Fixed and added some small features .

that , Next, let's take a specific look .

The overview

Maybe some of you don't know CAP What is it? , A brief introduction to the old ways .

CAP Is an open source project solution to solve the problem of distributed transactions in microservices or distributed systems （https://github.com/dotnetcore/CAP） It can also be used as EventBus Use , The project was born in 2016 year , Currently in Github There has been more than 5500+ Star and 70+ contributor , And in NuGet super 250 10000 Downloads , And it has been applied in the and projects of more and more companies .

If you want to be right CAP Learn more about , Please check our Official documents .

This time at CAP 6.1 In this version, we mainly bring the following new features ：

  • Optimized snowflake algorithm
  • Dashboard Support customization Authorization Policy
  • Azure Service Bus Add support for deferred messages
  • Support to configure the expiration and deletion time of failure messages
  • BUG Repair
    • Repair Dashbaord Enable Challenge Verification sequence problem
    • Repair RabbitMQ When the network jitters, the health check error occurs occasionally
    • Repair MySQL 8.0 When retrying query SQL Date format error
    • Repair Redis Streams Problems with idempotence checking when reading or creating streams

Optimized snowflake algorithm

In the past, we used the standard snowflake algorithm , There will be a clock sensitive problem .

because ID The generation is always bound to the timestamp of the current operating system （ It makes use of the monotonicity of time ））, So if the clock of the operating system goes back , Generated ID Will repeat , Generally, people will not manually dial back the clock , But the server will have occasional " Clock drift " The phenomenon . That is to say, in the case of multi node deployment , If the time of some servers is not accurate, duplicate keys will be generated and errors will be reported when writing messages to the database .

In this version , Unbind the time from the operating system timestamp , The generator only gets the current timestamp of the system at initialization , As the initial timestamp , But then it is no longer synchronized with the system timestamp . The increment after it , It is only driven by the increment of serial number . For example, the current value of the serial number is 4095, Next request to come in , Serial number +1 overflow 12 Bitspace , The serial number is reset to zero , The overflow carry is added to the timestamp , So that the timestamp +1.

After this version is updated , Generated Id There may be a large difference from the previous version , Just pay attention , It doesn't matter .

thank @Allen-dududu Submitted for PR！

Dashboard Support customization Authorization Policy

In this version , our Dashboard A new configuration item named AuthorizationPolicy Configuration item for , Used in scenarios where you want to use, for example, role-based authorization verification in the authorization process .

Usage is as follows , Mainly the annotated part .

services.AddAuthorization((options =>

{

   // only if you want to apply role filter to CAP Dashboard user

   options.AddPolicy("PolicyCap", policy => policy.RequireRole("admin.events"));

}))

.AddAuthentication(options =>

{

   options.DefaultScheme =  CookieAuthenticationDefaults.AuthenticationScheme;

   options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;

})

.AddCookie()

.AddOpenIdConnect(options =>

{

   options.Authority = "https://demo.identityserver.io/";

   options.ClientId = "interactive.confidential";

   options.ClientSecret = "secret";

   options.ResponseType = "code";

   options.UsePkce = true;

   options.Scope.Clear();

   options.Scope.Add("openid");

   options.Scope.Add("profile");

});

services.AddCap(cap =>

{

    cap.UseDashboard(d =>

    {

        d.UseChallengeOnAuth = true;

        d.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;

        d.UseAuth = true;

        // only if you want to apply policy authorization filter to CAP Dashboard user

        d.AuthorizationPolicy = "PolicyCap";

    });

    // ***

}

thank @albertopm19 Submitted for PR！

Azure Service Bus Add support for deferred messages

stay Azure Service Bus Zhongyuan provides support for delayed message sending , That is to use its ScheduledEnqueueTimeUtc Property settings . In this version, the CAP Specify the header message during sending to take advantage of this feature .

Examples are as follows ：

[HttpPost("publish")]

public async Task Publish()

{

    await _publisher.PublishAsync("demo-publish", string.Empty, new Dictionary<string, string?>

    {

        [AzureServiceBusHeaders.ScheduledEnqueueTimeUtc] = DateTimeOffset.UtcNow.AddSeconds(60).ToString(),

    });

}

thank @webinex Submitted for PR！

By the way , Some students also mentioned that RabbitMQ Support for deferred messages in , We do not support it , First, it needs to configure plug-ins to be non-native , Second, I hope you can use the scheduler （Quartz,Hangfire） Wait to do this , Professional things are left to professional components .

Support to configure the expiration and deletion time of failure messages

We have added a new configuration item FailedMessageExpiredAfter Used to configure the expiration time of failed messages , After the expiration time , The message will be deleted . The previous one is the value written dead 15 God , Now you can use this configuration item to configure .

thank @dima-zhemkov Submitted for PR！

BUG Repair

In this version , We have made some discoveries BUG Repair , Here are the repaired content items .

  • Repair Dashbaord Enable Challenge Verification sequence problem .
  • Repair RabbitMQ When the network jitters, the health check error occurs occasionally .
  • Repair MySQL 8.0 When retrying query SQL Date format error
  • Repair Redis Streams Problems with idempotence checking when reading or creating streams

summary

above , It is the support and changes we have made in this version , Thank you for your support , We're happy to be able to help . I hope you can give me positive feedback when you encounter problems in the process of using it , help CAP Get better and better .

If you like the project , You can click Star Give us support .

If you think this article is helpful to you , Thank you for 【 recommend 】.

This paper addresses ：http://www.cnblogs.com/savorboard/p/cap-6-1.html

The author blog ：Savorboard

The original authorization of this article is ： A signature - Noncommercial use - No derivatives , agreement Plain text | agreement Legal text

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