rust-system-event-driven

Development

Rust event-driven system programming best practices for async runtimes, channels, sockets, terminals, and concurrency. This skill should be used when writing, reviewing, or refactoring Rust applications with async I/O, multi-threading, terminal interfaces, or network communication. Triggers on tasks involving tokio, async/await, channels, sockets, TTY handling, signals, and streaming I/O.

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Rust System Event-Driven Best Practices

Comprehensive best practices guide for event-driven system programming in Rust. Contains 42 rules across 8 categories, prioritized by impact to guide async runtime usage, channel communication, threading, networking, and terminal handling.

When to Apply

Reference these guidelines when:

Building async applications with Tokio or async-std
Implementing network servers or clients
Writing terminal user interfaces (TUIs)
Managing concurrent tasks and shared state
Handling Unix signals and graceful shutdown

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Async Runtime Patterns	CRITICAL	`async-`
2	Channel Communication	CRITICAL	`chan-`
3	Threading & Synchronization	HIGH	`sync-`
4	Socket & Network I/O	HIGH	`net-`
5	Terminal & TTY Handling	MEDIUM-HIGH	`term-`
6	Signal & Process Control	MEDIUM	`sig-`
7	File I/O Streaming	MEDIUM	`io-`
8	Event Loop Architecture	LOW-MEDIUM	`loop-`

Quick Reference

1. Async Runtime Patterns (CRITICAL)

async-spawn-blocking - Use spawn_blocking for CPU-bound work
async-select-biased - Use biased select for priority handling
async-no-std-block - Avoid std blocking calls in async context
async-cancellation-safe - Design cancellation-safe async operations
async-task-local - Use task-local storage for request context
async-structured-concurrency - Use JoinSet for structured concurrency

2. Channel Communication (CRITICAL)

chan-bounded-backpressure - Use bounded channels for backpressure
chan-oneshot-response - Use oneshot channels for request-response
chan-broadcast-fanout - Use broadcast channels for fan-out
chan-watch-state - Use watch channels for shared state
chan-graceful-shutdown - Use channel closure for graceful shutdown

3. Threading & Synchronization (HIGH)

sync-arc-mutex-shared - Use Arc for shared mutable state
sync-rwlock-read-heavy - Use RwLock for read-heavy workloads
sync-atomic-counters - Use atomics for simple counters and flags
sync-avoid-lock-await - Avoid holding std Mutex across await
sync-semaphore-limit - Use Semaphore to limit concurrency
sync-parking-lot - Use parking_lot for high-contention locks

4. Socket & Network I/O (HIGH)

net-split-reader-writer - Split sockets into reader and writer halves
net-framing-codec - Use framing for message-based protocols
net-connection-pool - Use connection pools for repeated connections
net-timeout-all-io - Add timeouts to all network operations
net-tcp-nodelay - Set TCP_NODELAY for low-latency protocols
net-graceful-disconnect - Implement graceful connection shutdown

5. Terminal & TTY Handling (MEDIUM-HIGH)

term-raw-mode-restore - Always restore terminal state on exit
term-alternate-screen - Use alternate screen for full-screen apps
term-async-event-stream - Use async event stream for terminal input
term-buffered-output - Buffer terminal output for performance
term-handle-resize - Handle terminal resize events

6. Signal & Process Control (MEDIUM)

sig-ctrl-c-graceful - Handle Ctrl-C for graceful shutdown
sig-unix-signals - Handle Unix signals asynchronously
sig-child-reap - Reap child processes to avoid zombies
sig-timeout-shutdown - Set shutdown timeout to force exit

7. File I/O Streaming (MEDIUM)

io-async-file-ops - Use async file operations in async context
io-stream-large-files - Stream large files instead of loading entirely
io-copy-bidirectional - Use copy_bidirectional for proxying
io-pipe-communication - Use pipes for process communication
io-flush-before-read - Flush writes before expecting responses

8. Event Loop Architecture (LOW-MEDIUM)

loop-actor-model - Use actor pattern for stateful components
loop-event-types - Use typed events over dynamic dispatch
loop-state-machine - Model protocol state as type-safe state machine
loop-layered-architecture - Separate I/O from business logic
loop-cancellation-token - Use CancellationToken for coordinated shutdown

How to Use

Read individual reference files for detailed explanations and code examples:

Section definitions - Category structure and impact levels
Rule template - Template for adding new rules

Reference Files

File	Description
references/_sections.md	Category definitions and ordering
assets/templates/_template.md	Template for new rules
metadata.json	Version and reference information