Learning ASP.NET Core Best Practices With An Opensource Project

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SINTRA DIGITAL BUSINESS Learning ASP.NET Core Best Practices With An Opensource Project 1

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SINTRA DIGITAL BUSINESS 2 HELLO EVERYONE Until Covid-19 do us apart!

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SINTRA DIGITAL BUSINESS MYSELF IN THREE PICTURES A picture is worth a thousand words There is a world outside the internet! TREKKING The better sandbox for learning! OPENSOURCE The place where I do my best WORK 3

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SINTRA DIGITAL BUSINESS MYSELF IN SOCIAL NETWORKS Building better tomorrow. Trekker inside. CTO interested in #CloudComputing, #AgileDevelopment and #Opensource 4 https://www.linkedin.com/in/daniele-fontani/ https://medium.com/@daniele.fontani https://twitter.com/zeppaman https://github.com/zeppaman [email protected]

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SINTRA DIGITAL BUSINESS Why opensource is the best env for developing new skills From opensource to open mind All the bricks needed for an enterprise asp.net application Best practices What was my test case The gym 5 AGENDA

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SINTRA DIGITAL BUSINESS 6 FROM OPENSOURCE TO OPEN MIND

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SINTRA DIGITAL BUSINESS You give you software for free, without patents Unsuccessful business model It’s just a loose of time Opensource is for losers Opensource? is simply Linux Ignorance 7 IN 2006

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SINTRA DIGITAL BUSINESS Learn new things, compare yourself with others CHALLENGING I give to the community for what I take ETHICAL Give me a lot, not money, but friends and knowledge REWARDING 8 THEN MY FIRST EXPERIENCE

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SINTRA DIGITAL BUSINESS I've never stopped. 9 AND THEN... I've never stopped

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SINTRA DIGITAL BUSINESS 10 THE GYM

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SINTRA DIGITAL BUSINESS DEMO http://rawcms-demo.herokuapp.com/ PROJECT PAGE https://github.com/arduosoft/RawCMS RAWCMS 11 11

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SINTRA DIGITAL BUSINESS 12 BEST PRACTICES

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SINTRA DIGITAL BUSINESS Divide et impera MICROSERVICES One app, many customer MULTITENANCY One login many app IDENTITY World is Async BACKGROUND JOBS Get best from all MULTIPLE DATABASES Make things happens by design AOP BEST PRACTICES ROADMAP 13 For extension PLUGINs

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SINTRA DIGITAL BUSINESS PLUGINS Extend you application adding a deployable artifact. 14

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SINTRA DIGITAL BUSINESS 15 WHAT WE NEED

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SINTRA DIGITAL BUSINESS 16 WHY PLUGIN IN THE MICROSERVICES ERA? There are some cases when microservices are hard to implement: ● Old codebase ● Background jobs ● Completely coupled business logic ● Very small application domains ● On-Prem Products WE ARE HERE

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SINTRA DIGITAL BUSINESS 17 THE BASICS

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SINTRA DIGITAL BUSINESS AOP In computing, aspect-oriented programming (AOP) is a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It does so by adding additional behavior to existing code (an advice) without modifying the code itself […] This allows behaviors that are not central to the business logic (such as logging) to be added to a program without cluttering the code, core to the functionality. https://en.wikipedia.org/wiki/Aspect-oriented_programming 19

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SINTRA DIGITAL BUSINESS 20 IN SIMPLE WORDS Make things happen without writing code.

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SINTRA DIGITAL BUSINESS 21 THE LOGGING EXAMPLE BEFORE AOP AFTER AOP

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SINTRA DIGITAL BUSINESS 22 THE DATA EXAMPLE BEFORE AOP AFTER AOP

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SINTRA DIGITAL BUSINESS 23 HOW IT IS POSSIBLE ProxyDispatcher

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SINTRA DIGITAL BUSINESS 24 IN 34 LINES OF CODE FULL EXAMPLE ON https://github.com/zeppaman/csharp-aop

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SINTRA DIGITAL BUSINESS 25 I CAN'T BELIEVE IT 1 MINUTE DEMO

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SINTRA DIGITAL BUSINESS 26 MY THOUGHT ABOUT AOP IN C# ● Its' ok for logging and measuring (but with a good control on what is logged or not). Pay attention to the C# limit: only virtual method or interface implementation can be intercepted. ● For the other application you cannot do yourself. You need a framework like Spring in Java, but we are on the other side.

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SINTRA DIGITAL BUSINESS BACKGROUND JOBS 28 Web can’t wait for you

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SINTRA DIGITAL BUSINESS 29 SYNC IS DEAD LONG LIVE TO ASYNC! In 2020 most scenario need to be async, we have to live with it. This means every web application is also a background worker. Note:We may have a microservice application where you invoke by api the job on other server(container), but the application that host background job... is still a web application because have to be invoked by API!

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SINTRA DIGITAL BUSINESS 30 WHY PUT IT INSIDE A WEB APPLICATION?

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SINTRA DIGITAL BUSINESS THE CHOICE Native, but just a process runner Based on service definition Native solution A complete scheduling solution Based on fluent code Hangfire 31

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SINTRA DIGITAL BUSINESS HANGFIRE 32 •Persistency •Balancing on multiple server •Dashboard •Authentication •Possibility to run processes manually What else?

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SINTRA DIGITAL BUSINESS 33 I CAN’T BELIEVE IT 1 MINUTE DEMO

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SINTRA DIGITAL BUSINESS IDENTITY Cyclops, you asked about my famous name. I’ll tell you. Then you can offer me a gift, as your guest. My name is Nobody. My father and mother, all my other friends— they call me Nobody. Odysseus and Polyphemus - Odyssey 35

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SINTRA DIGITAL BUSINESS 36 WHAT IS NOT ACCEPTABLE ON 2020 ● INSERT YOUR PASSWORD TWICE ● HAVE DIFFERENT ACCOUNT FOR DIFFERENT APPLICATION ● USE SERVICE ACCOUNTS THAT OPERATES ON BEHALF OF YOU ● IMPLEMENT IT BY YOURSELF

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SINTRA DIGITAL BUSINESS 37 SCENARIOS WITH IDS START EASY AND EVOLVE LATER

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SINTRA DIGITAL BUSINESS 38 SCENARIOS FEDERATION STANDALONE

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SINTRA DIGITAL BUSINESS MULTIPLE DATABASE Keeping same data in multiple places 40

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SINTRA DIGITAL BUSINESS 41 WHY ● Pick the best from each tool ● RDBMS may be not enough in 2020 If you are ﬁghting against tanks, you don’t need a swiss army. You need the army.

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SINTRA DIGITAL BUSINESS 42 HOW You can use event listener on Hibernate, the OnSave method on Entity framework, or in case you are not using a orm.. Well, in thi case you need to rewrite the app and the full text search Is the last of your problems AUTOMATIC

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SINTRA DIGITAL BUSINESS 43 IN CODE WORDS

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SINTRA DIGITAL BUSINESS MULTITENCANCY One application, multiple customers 45

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SINTRA DIGITAL BUSINESS 46 SCENARIOS Data isolation can be theoretically done at all levels (row, table, database, server) but only this make sense: ● Put all data in the same table, but separate ﬁltering basing on user (not GDPR compliant, not performant). ● Use different database (with the options to have multiple servers) Options

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SINTRA DIGITAL BUSINESS 47 WHY THE HELL I NEED MULTI TENANCY? It is not really needed in B2B application, but it is a common scenario when: ● You have multiple customer on same infrastructure (SaaS) ● Your are designing a product ● You may transform your custom application to a product or platform for many customer ● You hold sensitive data and GDPR ask you for security

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SINTRA DIGITAL BUSINESS 48 HOW TO IMPLEMENT IT Dependency Injection is your friend

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SINTRA DIGITAL BUSINESS 49 IN CODE WORDS CONFIGURATION USAGE

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SINTRA DIGITAL BUSINESS 50 OR DO NOT REINVENT THE WHEEL AUTOFAC TENANT NAME DETECTION POLICY MANAGE PER TENANT DIFFERENCES

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SINTRA DIGITAL BUSINESS MICROSERVICES Divide et impera 52

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SINTRA DIGITAL BUSINESS 53 WHAT IS MICROSERVICES? The Chimera of Arezzo, Etruscan artwork. Now conserved in Florence. The Chimera Everybody try to implement microservices, but how micro they have to be is not said. A myth or reality?

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SINTRA DIGITAL BUSINESS 54 WHY MICROSERVICES ARE A CHIMERA? ● The size of each microservices depends upon the business logic complexity and dependency. You microservice could be not so micro ● Reusing of common part is not easy on a distributed system. If the common layer changes quickly you ﬁnish for having a monolithic system splitted into a lot of part Problems ● A good analysis helps ● Use containers, always. ● Start with a good architecture (oauth2 with IDS, job server,...). Solutions

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SINTRA DIGITAL BUSINESS 56 WHAT TO TAKE HOME

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SINTRA DIGITAL BUSINESS 57 POINT OF INTEREST ● Opensource is not for losers, but a real allied for become a better programmer. ● Working on challenging projects make you a better programmer. ● Lot of optional stuff are now included, don’t reinvent the wheel

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SINTRA DIGITAL BUSINESS 58 REFERENCES ● SOURCE CODE https://github.com/zeppaman/aspnet-best-practices ● RAWCMS https://github.com/arduosoft/RawCMS ● AOP https://levelup.gitconnected.com/aop-dotnet-applications-67c6d94c08b0 ● THIS PRESENTATION https://speakerdeck.com/zeppaman/learning-asp-dot-net-core-best-practices-w ith-an-opensource-project

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SINTRA DIGITAL BUSINESS 59 THANK YOU