PeterHarding: Created page with " * https://medium.com/@toyezyadav/i-replaced-my-spring-boot-microservice-with-rust-and-go-heres-the-system-design-that-saved-my-f3ccedd6e494

 // src/lib.rs (Rust Service) use std::time::Instant; use sha2::{Sha256, Digest};  // Simulating the same heavy, synchronous transformation/hashing operation pub fn calculate_user_partition_key(user_id: &str, complexity: u32) -> String {     let start = Instant::now();     let mut base = user_id.to_string();      for i in 0..c..."

2026-01-28T05:47:35Z

Created page with " * https://medium.com/@toyezyadav/i-replaced-my-spring-boot-microservice-with-rust-and-go-heres-the-system-design-that-saved-my-f3ccedd6e494 <pre> // src/lib.rs (Rust Service) use std::time::Instant; use sha2::{Sha256, Digest}; // Simulating the same heavy, synchronous transformation/hashing operation pub fn calculate_user_partition_key(user_id: &str, complexity: u32) -> String { let start = Instant::now(); let mut base = user_id.to_string(); for i in 0..c..."

New page

* https://medium.com/@toyezyadav/i-replaced-my-spring-boot-microservice-with-rust-and-go-heres-the-system-design-that-saved-my-f3ccedd6e494

<pre>
// src/lib.rs (Rust Service)
use std::time::Instant;
use sha2::{Sha256, Digest};

// Simulating the same heavy, synchronous transformation/hashing operation
pub fn calculate_user_partition_key(user_id: &str, complexity: u32) -> String {
let start = Instant::now();
let mut base = user_id.to_string();

for i in 0..complexity {
let mut hasher = Sha256::new();
// Rust's zero-cost abstractions and memory safety shine here
hasher.update(base.as_bytes());
hasher.update(i.to_string().as_bytes());
base = format!("{:x}", hasher.finalize());
}

let duration = start.elapsed();
// This is the "hot path" code. It's clean, safe, and ridiculously fast.
base[0..16].to_string()
}
</pre>

[[Category:Rust]]

Rust Examples - Revision history