Modularise a Laravel Monolith Application

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MUHAMMAD ZESHAN KHATTAK https://pinkary.com/@zeshan77

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Modularising the Monolith LaravelLive Pakistan 2024

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SHIP THE PRODUCT TO THE MARKET

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BENEFITS OF MONOLITH • Single repository • Single CI/CD pipeline • Single set of infrastructure • Easy to handle DB transactions

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BIG BALL OF MUD • Tight coupling between functionalities • No domain boundaries • All code is globally accessible • Need to understand the entire codebase

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MICROSERVICES User Interface Microservice Microservice Microservice HTTP HTTP

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BENEFITS OF MICROSERVICES • Clear boundaries between services • Deployed independently • Can be scaled independently • Freedom of tech stack

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CHALLENGES OF MICROSERVICES • Multiple repositories • Multiple CI/CD pipelines • Network overhead • Complex cross-service transactions

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TECHNICAL DECISIONS ARE ALWAYS TRADE-OFF

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OUR GOALS • Maximise teams’ productivity • Scalable architecture

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OUR APPROACH • Modularise the monolith • De f ine domain boundaries

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MODULAR MONOLITH Contracts Implementation Tests Contracts Implementation Tests Contracts Implementation Tests Inventory module Order module Payment module

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INCREMENTAL MIGRATION MICROSERVICES Contracts Implementation Tests Contracts Implementation Tests Contracts Implementation Tests Inventory service Order module Payment module

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MICROSERVICES ARE EXPENSIVE TO CHANGE User Interface Microservice Microservice Microservice HTTP HTTP

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MODULAR MONOLITH IS EASIER TO CHANGE Contracts Implementation Tests Contracts Implementation Tests Contracts Implementation Tests Inventory module Order module Payment module

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MODULES & TEAM STRUCTURE Inventory Module Order Module Payment Module Shipping Module Auth Module

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DEFAULT STRUCTURE

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MODULAR STRUCTURE

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COMMUNICATION BETWEEN MODULE

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COMMUNICATION THROUGH CONTRACT Module A Module B Downstream Upstream Contract Implementation

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CROSS-MODULE FOREIGN KEY LEADS TO A TIGHT COUPLING Order module Inventory module Products Cart Items product_id id

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HOW CAN WE ENFORCE DOMAIN BOUNDARIES?

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STATIC ANALYSIS • Deptrac • De f ine layers based on PHP classes • De f ine rulesets on layers access • Detect violation of the rulesets • Visualize dependency graph

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THANK YOU https://pinkary.com/@zeshan77