nsq-async-rs

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nsq-async-rs is a high-performance, reliable NSQ client library written in Rust. The project is inspired by the official go-nsq implementation and provides similar functionality and interfaces in the Rust ecosystem.

Features

• ✨ Async I/O support (based on tokio)
• 🚀 High-performance message processing
• 🔄 Automatic reconnection and error retry
• 🔍 Support for nsqlookupd service discovery
• 🛡️ Graceful shutdown support
• 📊 Built-in message statistics
• ⚡ Support for delayed publishing
• 📦 Support for batch publishing
• 🔀 Support for concurrent message processing
• 💫 Feature parity with official go-nsq

Installation

Add the following to your Cargo.toml:

[dependencies]
nsq-async-rs = "0.1.5"

Quick Start

Basic Consumer Example

use nsq_async_rs::consumer::{Consumer, ConsumerConfig, Handler};
use nsq_async_rs::error::Result;
use nsq_async_rs::protocol::Message;

#[derive(Default)]
struct MessageHandler;

#[async_trait::async_trait]
impl Handler for MessageHandler {
    async fn handle_message(&self, message: Message) -> Result<()> {
        println!("Received message: {:?}", String::from_utf8_lossy(&message.body));
        Ok(())
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let config = ConsumerConfig::default();
    let consumer = Consumer::new(
        "test_topic".to_string(),
        "test_channel".to_string(),
        config,
        MessageHandler::default(),
    )?;

    consumer.connect_to_nsqlookupd("http://127.0.0.1:4161".to_string()).await?;
    consumer.start().await?;

    tokio::signal::ctrl_c().await?;
    consumer.stop().await?;
    Ok(())
}

Concurrent Consumer Example

use async_trait::async_trait;
use log::{error, info};
use nsq_async_rs::consumer::{Consumer, ConsumerConfig, Handler};
use nsq_async_rs::error::Result;
use nsq_async_rs::protocol::Message;
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::{mpsc, Mutex};

/// Concurrent message handler
struct ConcurrentMessageHandler {
    worker_count: usize,
    sender: Arc<Mutex<mpsc::Sender<Message>>>,
}

impl ConcurrentMessageHandler {
    pub fn new(worker_count: usize) -> Self {
        // Create message channel with buffer size 10x worker count
        let (tx, rx) = mpsc::channel(worker_count * 10);
        let sender = Arc::new(Mutex::new(tx));
        let receiver = Arc::new(Mutex::new(rx));

        let handler = Self {
            worker_count,
            sender,
        };

        // Start worker threads
        handler.start_workers(receiver);

        handler
    }

    fn start_workers(&self, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) {
        for i in 0..self.worker_count {
            let worker_id = i + 1;
            let rx = receiver.clone();

            tokio::spawn(async move {
                info!("Worker {} started", worker_id);

                loop {
                    // Get message from channel
                    let msg = {
                        let mut rx_guard = rx.lock().await;
                        match rx_guard.recv().await {
                            Some(msg) => msg,
                            None => break,
                        }
                    };

                    // Process message
                    let msg_id = String::from_utf8_lossy(&msg.id).to_string();
                    info!("Worker {} processing message: {}", worker_id, msg_id);
                    
                    // Add your message processing logic here
                    
                    info!("Worker {} finished processing message: {}", worker_id, msg_id);
                }
            });
        }
    }
}

#[async_trait]
impl Handler for ConcurrentMessageHandler {
    async fn handle_message(&self, message: Message) -> Result<()> {
        let msg_id = String::from_utf8_lossy(&message.id).to_string();
        let sender = self.sender.lock().await;

        // Try non-blocking send first
        let send_result = sender.try_send(message.clone());
        match send_result {
            Ok(_) => {
                info!("Message sent to worker channel: ID={}", msg_id);
            }
            Err(mpsc::error::TrySendError::Full(msg)) => {
                // Channel full, use blocking send
                if let Err(e) = sender.send(msg).await {
                    error!("Failed to send message to worker channel: {}", e);
                    return Err(nsq_async_rs::error::Error::Other(e.to_string()));
                }
            }
            Err(mpsc::error::TrySendError::Closed(_)) => {
                error!("Worker channel closed: ID={}", msg_id);
                return Err(nsq_async_rs::error::Error::Other("Worker channel closed".into()));
            }
        }

        Ok(())
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    // Create consumer config
    let config = ConsumerConfig {
        max_in_flight: 100, // Increase for higher throughput
        max_attempts: 5,
        // Other config options...
        ..Default::default()
    };

    // Create concurrent handler with 20 worker threads
    let handler = ConcurrentMessageHandler::new(20);

    // Create consumer
    let consumer = Consumer::new(
        "test_topic".to_string(),
        "test_channel".to_string(),
        config,
        handler,
    )?;

    consumer.connect_to_nsqlookupd("http://127.0.0.1:4161".to_string()).await?;
    consumer.start().await?;

    tokio::signal::ctrl_c().await?;
    consumer.stop().await?;
    Ok(())
}

Basic Producer Example

use nsq_async_rs::producer::Producer;
use nsq_async_rs::error::Result;

#[tokio::main]
async fn main() -> Result<()> {
    let producer = Producer::connect("127.0.0.1:4150").await?;
    
    producer.publish("test_topic", "Hello, NSQ!".as_bytes()).await?;
    Ok(())
}

Batch Publishing Example

use chrono::Local;
use nsq_async_rs::producer::{new_producer, ProducerConfig};
use std::error::Error;
use std::time::Instant;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Create producer config
    let mut config = ProducerConfig::default();
    config.nsqd_addresses = vec!["127.0.0.1:4150".to_string()];

    // Create NSQ producer
    let producer = new_producer(config);
    let topic = "test_topic";
    
    // Prepare multiple messages
    let mut messages = vec![];
    for i in 0..100 {
        messages.push(format!(
            "Message #{}, Time:{}",
            i + 1,
            Local::now().to_string()
        ));
    }

    // Measure batch publishing performance
    let start = Instant::now();
    producer.publish_multi(topic, messages).await?;
    let elapsed = start.elapsed();

    println!("Batch publishing 100 messages took: {:?}", elapsed);
    println!("Average time per message: {:?}", elapsed / 100);

    Ok(())
}

Configuration Options

Consumer Configuration

ConsumerConfig {
    max_in_flight: 100,                  // Maximum number of messages to process simultaneously
    max_attempts: 5,                     // Maximum number of retries
    dial_timeout: Duration::from_secs(1),  // Connection timeout
    read_timeout: Duration::from_secs(60), // Read timeout
    write_timeout: Duration::from_secs(1), // Write timeout
    lookup_poll_interval: Duration::from_secs(60), // nsqlookupd polling interval
    lookup_poll_jitter: 0.3,              // Polling jitter coefficient
    max_requeue_delay: Duration::from_secs(15 * 60), // Maximum requeue delay
    default_requeue_delay: Duration::from_secs(90),  // Default requeue delay
    shutdown_timeout: Duration::from_secs(30),       // Shutdown timeout
    backoff_strategy: true,                // Enable exponential backoff reconnection strategy
}

Advanced Features

Connection Health Check (Ping)

// Ping with default timeout (5 seconds)
let result = producer.ping(None, None).await;

// Ping with custom address and timeout
let result = producer.ping(
    Some("127.0.0.1:4150"),
    Some(Duration::from_millis(500))
).await;

// Check ping result before proceeding
if let Err(err) = result {
    println!("NSQ server connection error: {}", err);
    // Handle connection error...
}

Delayed Publishing

producer.publish_with_delay("test_topic", "Delayed message".as_bytes(), Duration::from_secs(60)).await?;

Batch Publishing

let messages = vec![
    "Message 1".as_bytes().to_vec(),
    "Message 2".as_bytes().to_vec(),
    "Message 3".as_bytes().to_vec(),
];
producer.publish_multiple("test_topic", messages).await?;

Contributing

Contributions are welcome! Please feel free to submit issues and pull requests.

License

MIT License