1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62

#[macro_use]
extern crate serde_derive;
#[macro_use]
extern crate thiserror;
#[macro_use]
extern crate anyhow;

#[doc(hidden)]
pub mod bus_message;

mod error;
mod id;
mod request;

pub use error::*;
pub use id::*;
pub use request::*;

use serde::de::DeserializeOwned;
use serde::Serialize;
use std::io::Cursor;

pub type Result<T> = anyhow::Result<T>;

/// 订阅消息
pub trait Topic: Serialize + DeserializeOwned + Send + Sync + 'static {
    fn name() -> &'static str;

    fn encode(&self) -> Result<Vec<u8>> {
        let data = rmp_serde::to_vec(self)?;
        Ok(data)
    }

    fn decode(data: &[u8]) -> Result<Self> {
        let msg = rmp_serde::from_read(Cursor::new(data))?;
        Ok(msg)
    }
}

/// 上下文
#[async_trait::async_trait]
pub trait Context {
    /// 调用服务
    async fn call<T, R>(&self, service_name: &str, request: Request<T>) -> Result<Response<R>>
    where
        T: Serialize + Send + 'static,
        R: DeserializeOwned + Send + 'static;

    /// 发送通知
    async fn notify<T: Serialize + Send + 'static>(&self, service_name: &str, request: Request<T>);

    /// 给指定服务发送通知
    async fn notify_to<T: Serialize + Send + 'static>(&self, to: ServiceId, request: Request<T>);

    /// 发布消息
    async fn publish_with_topic<T: Topic>(&self, topic: &str, msg: T);

    /// 发布消息
    async fn publish<T: Topic>(&self, msg: T) {
        self.publish_with_topic(T::name(), msg).await
    }
}