Everything you need to level up your coding skills.
Safe Rust prevents memory corruption but not logic errors, panics, leaks, deadlocks or overflow. See exactly what is guaranteed, what is not and where unsafe code and dependencies reopen the gap.
Backpressure is how a slow consumer tells a fast producer to slow down. Without it, queues grow until memory runs out. Rust's bounded channels and semaphores make it explicit.
A service that stays up by doing less beats one that tries to do everything and falls over. Decide in advance what to drop and how to say no quickly.
In-process limiters count per instance, so ten replicas allow ten times the limit. A shared counter in Redis makes the limit global, at the cost of a network hop and a failure policy.
An actor is a task that owns its data and processes messages one at a time. Channels replace locks, and a handle type hides the plumbing.
An event bus lets parts of a program react to things without knowing about each other. Tokio's broadcast channel gives a small, typed one with built-in handling for slow subscribers.
A limiter is a function of time, so tests should control time. Assert the boundaries: the last allowed request, the first rejected one and the moment capacity returns.
Stress tests find concurrency bugs by luck. Loom explores every legal ordering of your threads and memory operations, so a missing Acquire fails deterministically.
Both are excellent, and the difference is architecture. SQLite is a library inside your process, and Postgres is a server your process talks to. Pick by how many writers and machines you need.
Higher isolation levels prevent anomalies by aborting transactions that conflict. Your code must expect those aborts and retry the whole transaction.
du walks a tree and adds up file sizes. The interesting decisions are hard links counted once, symlinks left alone and how to keep going when a directory is unreadable.
A fuzzy finder reads lines, filters them as you type and prints the one you pick. The pieces are raw mode input, a matching engine and a small redraw loop.
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