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378af4cb74
Added doc.go files for the three main layers of the Mattermost server architecture: - api4/doc.go: HTTP REST API layer documentation - Explains endpoint structure and authentication handlers - Details input validation, permission checks, and error formatting - Covers security features and audit logging - app/doc.go: Business logic layer documentation - Describes the core application logic components - Explains design patterns like request context and dependency injection - Details key responsibilities including data orchestration and event handling - store/doc.go: Data persistence layer documentation - Documents the multi-layered architecture with caching, search, and retry layers - Explains the store interface pattern and domain-specific stores - Covers performance considerations and migration system These documentation files provide comprehensive overviews of each layer's responsibilities, architecture patterns, and integration points, making the codebase more accessible to developers. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-authored-by: Claude <noreply@anthropic.com>
85 lines
3.8 KiB
Go
85 lines
3.8 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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/*
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Package app provides the business logic layer for Mattermost Channels.
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This package serves as the core business logic layer that sits between the API layer (api4)
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and the data access layer (store). It contains the primary application logic for all
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Mattermost functionality including user management, channel operations, post handling,
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notifications, authentication, authorization, and integrations.
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# Architecture
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The app package follows a layered architecture pattern:
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┌─────────────────────────────────────────────────────────────────┐
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│ API Layer (api4) │
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├─────────────────────────────────────────────────────────────────┤
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│ Business Logic (app) │
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├─────────────────────────────────────────────────────────────────┤
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│ Data Access (store) │
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└─────────────────────────────────────────────────────────────────┘
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# Core Components
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## App Structure
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The App struct is the main entry point for business logic operations. It is a pure
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functional component that does not hold state, constructed per request and provides
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access to business logic methods through its association with the Channels struct.
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## Server
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The Server struct manages the HTTP server, routing, middleware, and service lifecycle.
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It coordinates between platform services, manages enterprise features, handles
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clustering, and provides the runtime environment for the application.
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## Channels
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The Channels struct contains all channels-related state and enterprise interface
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implementations. It manages plugins, file storage, image processing, and coordinates
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various enterprise features like compliance, LDAP, and SAML.
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## Platform Service
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The platform service handles non-entity related functionalities required by the
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application including database access, configuration management, caching, licensing,
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metrics, and search engines.
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# Design Patterns
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## Request Context Pattern
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All business logic methods accept a request.CTX parameter for request-scoped
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logging, tracing, and cancellation.
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## Interface Segregation
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Enterprise features are accessed through interfaces in the einterfaces package,
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allowing for modular enterprise functionality.
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## Dependency Injection
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Services and dependencies are injected through the Server and Channels structs,
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enabling testability and modularity.
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## Event-Driven Architecture
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The application uses WebSocket events and plugin hooks for real-time updates
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and extensibility.
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# Key Responsibilities
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- Business logic: Core application rules and workflows
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- Data orchestration: Coordinate between multiple stores and services
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- External integrations: Third-party service calls and API interactions
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- Cache management: Handle cache invalidation and updates
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- Event handling: Trigger notifications, webhooks, and background jobs
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# Error Handling
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The package uses model.AppError for consistent error handling across the
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application. Errors include structured information for logging, user
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messages, and HTTP status codes.
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This package is central to the Mattermost server architecture and provides
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the foundation for all collaboration features in the platform.
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*/
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package app
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