caisin 0.1.57

caisin tools
Documentation 
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use std::collections::HashMap;

use anyhow::Result;
use tokio::runtime::Builder;

pub struct Subscriber<T> {
    id: String,
    topic: String,
    exec_fn: fn(msg: T) -> Result<()>,
}

impl<T> Subscriber<T> {
    pub fn get_id(&self) -> String {
        self.id.clone()
    }
}
pub struct Publisher<T> {
    rt: tokio::runtime::Runtime,
    subs: HashMap<String, Subscriber<T>>,
}

impl<T: Clone + Send + 'static> Publisher<T> {
    pub fn new(wt: usize) -> Self {
        let rt = Builder::new_multi_thread()
            .worker_threads(wt)
            .enable_all()
            .build()
            .unwrap();
        Self {
            rt,
            subs: HashMap::new(),
        }
    }
    pub async fn sub(&mut self, topic: &str, exec_fn: fn(msg: T) -> Result<()>) -> String {
        let sub_id = nanoid::nanoid!(10);
        self.subs.insert(
            sub_id.clone(),
            Subscriber {
                id: sub_id.clone(),
                topic: topic.to_string(),
                exec_fn,
            },
        );
        sub_id
    }

    pub async fn remove(&mut self, id: &str) {
        self.subs.remove(id).unwrap();
    }

    pub async fn publish_all(&self, msg: T) {
        self.publish("", msg).await;
    }

    pub async fn publish(&self, topic: &str, msg: T) {
        let mut hds = vec![];
        for (_, sub) in self.subs.iter() {
            if topic.eq("") || sub.topic.eq(topic) {
                let exec_fn = sub.exec_fn;
                let c_msg = msg.clone();
                let spawn = self.rt.spawn(async move {
                    match exec_fn(c_msg) {
                        Ok(_) => {}
                        Err(err) => {
                            println!("{err}")
                        }
                    }
                });
                hds.push(spawn);
            }
        }
        for ele in hds {
            ele.await.unwrap()
        }
    }

    pub fn shutdown(self) {
        self.rt.shutdown_background();
    }
}

#[tokio::test]
async fn test_pub_sub() {
    let mut ps: Publisher<String> = Publisher::new(10);
    ps.sub("hello", |msg| {
        println!("hello:{msg}");
        
        Ok(())
    })
    .await;
    ps.sub("hello", |msg| {
        println!("hello:{msg}");
        Ok(())
    })
    .await;
    ps.publish("hello", "hello niha".to_string()).await;
    // ps.publish_all("niha".to_string()).await;
    ps.shutdown();
    println!("haha")
}