Handling Environment Variables in a Rust Program
Learn how to properly handle environment variables in your Rust applications! This comprehensive tutorial takes you from basic command-line environment variables to implementing a robust configuration system using .env files and the powerful lazy_static pattern.
⏱️ Timeline:
00:00 Purpose of the video
04:43 Setting Environment Variables via Command Line
05:27 Accessing Environment Variables in Rust
07:54 Set Environment Variables Directly in Your Program
08:48 The Dotenvy Crate
11:34 Handling Errors
17:34 Grouping Environment Variables
21:04 The Lazy_Static Crate
27:51 Use Environment Variables from multiple sources
🔍 What you'll learn:
Command-line environment variable handling
Using the dotenvy crate for .env file management
Creating custom error types for better error handling
Implementing a global configuration system
Managing multiple environment configurations (local, dev, prod)
Thread-safe configuration access
Security best practices
💻 Prerequisites:
Basic Rust knowledge
Cargo package manager installed
📦 Crates used:
dotenvy
lazy_static
🔗 Resources:
Rust Documentation: https://doc.rust-lang.org/book/
Dotenvy Crate: https://crates.io/crates/dotenvy
Lazy_static Crate: https://crates.io/crates/lazy_static
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