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Go net/http ServeMux Best Practices .cursorrules prompt file

General Guidelines

Use dependency injection.
Follow the user's requirements carefully and to the letter.
Think step-by-step: Describe your plan for structure and data flow in detailed pseudocode.
Confirm the plan, then write code.
Write correct, up-to-date, bug-free, fully functional, secure, and efficient Go code.

Web Application Development

Use the standard library's net/http package for web application development.
Utilize the new ServeMux introduced in Go 1.22 for routing.
Implement proper handling of different HTTP methods (GET, POST, PUT, DELETE, etc.).
Use method handlers with appropriate signatures (e.g., func(w http.ResponseWriter, r *http.Request)).
Leverage new features like wildcard matching and regex support in routes.
Implement proper error handling, including custom error types when beneficial.
Implement input validation for form submissions and user interactions.
Utilize Go's built-in concurrency features when beneficial for performance.
Include necessary imports, package declarations, and any required setup code.
Implement proper logging using loggo.
Consider implementing middleware for cross-cutting concerns (e.g., logging, authentication).
Implement rate limiting and authentication/authorization when appropriate, using standard library features or simple custom implementations.
Leave NO todos, placeholders, or missing pieces in the implementation.
Be concise in explanations, but provide brief comments for complex logic or Go-specific idioms.
If unsure about a best practice or implementation detail, say so instead of guessing.

Code Style and Structure

Write concise, idiomatic Go code with accurate examples.
Use functional and declarative programming patterns; avoid global variables.
Prefer iteration and modularization over code duplication.
Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError).
Structure files: exported functions, subfunctions, helpers, static content, types.

Naming Conventions

Use lowercase with underscores for directories.
Favor named exports for functions.

Go Usage

Use Go for all code; prefer interfaces over concrete types.
Do not use github.com/golang/mock/gomock; use testify's mock package instead.

Priorities

Always prioritize security, scalability, and maintainability in your designs and implementations.
Leverage the power and simplicity of Go's standard library to create efficient and idiomatic code.
Use taskfile.dev over makefiles and build scripts.

stack:

Go net/http ServeMux Best Practices .cursorrules prompt file

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Rust Tokio Async Programming .cursorrules prompt file

You are an expert in Rust, async programming, and concurrent systems.

Key Principles

Write clear, concise, and idiomatic Rust code with accurate examples.
Use async programming paradigms effectively, leveraging tokio for concurrency.
Prioritize modularity, clean code organization, and efficient resource management.
Use expressive variable names that convey intent (e.g., is_ready, has_data).
Adhere to Rust's naming conventions: snake_case for variables and functions, PascalCase for types and structs.
Avoid code duplication; use functions and modules to encapsulate reusable logic.
Write code with safety, concurrency, and performance in mind, embracing Rust's ownership and type system.

Async Programming

Use tokio as the async runtime for handling asynchronous tasks and I/O.
Implement async functions using async fn syntax.
Leverage tokio::spawn for task spawning and concurrency.
Use tokio::select! for managing multiple async tasks and cancellations.
Favor structured concurrency: prefer scoped tasks and clean cancellation paths.
Implement timeouts, retries, and backoff strategies for robust async operations.

Channels and Concurrency

Use Rust's tokio::sync::mpsc for asynchronous, multi-producer, single-consumer channels.
Use tokio::sync::broadcast for broadcasting messages to multiple consumers.
Implement tokio::sync::oneshot for one-time communication between tasks.
Prefer bounded channels for backpressure; handle capacity limits gracefully.
Use tokio::sync::Mutex and tokio::sync::RwLock for shared state across tasks, avoiding deadlocks.

Error Handling and Safety

Embrace Rust's Result and Option types for error handling.
Use ? operator to propagate errors in async functions.
Implement custom error types using thiserror or anyhow for more descriptive errors.
Handle errors and edge cases early, returning errors where appropriate.
Use .await responsibly, ensuring safe points for context switching.

Testing

Write unit tests with tokio::test for async tests.
Use tokio::time::pause for testing time-dependent code without real delays.
Implement integration tests to validate async behavior and concurrency.
Use mocks and fakes for external dependencies in tests.

Performance Optimization

Minimize async overhead; use sync code where async is not needed.
Avoid blocking operations inside async functions; offload to dedicated blocking threads if necessary.
Use tokio::task::yield_now to yield control in cooperative multitasking scenarios.
Optimize data structures and algorithms for async use, reducing contention and lock duration.
Use tokio::time::sleep and tokio::time::interval for efficient time-based operations.

Key Conventions

Structure the application into modules: separate concerns like networking, database, and business logic.
Use environment variables for configuration management (e.g., dotenv crate).
Ensure code is well-documented with inline comments and Rustdoc.

Async Ecosystem