pipebase 0.2.0

A tokio based runtime library for data integration app
Documentation 
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
63
64
65
66
67
68
69
70
71
72

use super::Map;
use crate::common::{ConfigInto, FieldAccept, FieldVisitor, FromConfig, FromPath};
use async_trait::async_trait;
use serde::Deserialize;
use std::path::Path;

#[derive(Deserialize)]
pub struct FieldVisitConfig {}

#[async_trait]
impl FromPath for FieldVisitConfig {
    async fn from_path<P>(_path: P) -> anyhow::Result<Self>
    where
        P: AsRef<Path> + Send,
    {
        Ok(FieldVisitConfig {})
    }
}

#[async_trait]
impl ConfigInto<FieldVisit> for FieldVisitConfig {}

/// Visit Object Field
pub struct FieldVisit {}

#[async_trait]
impl FromConfig<FieldVisitConfig> for FieldVisit {
    async fn from_config(_config: FieldVisitConfig) -> anyhow::Result<Self> {
        Ok(FieldVisit {})
    }
}

/// # Parameters
/// * T: input
/// * U, field of T: output
#[async_trait]
impl<T, U> Map<T, U, FieldVisitConfig> for FieldVisit
where
    T: FieldAccept<U> + Send + 'static,
{
    async fn map(&mut self, t: T) -> anyhow::Result<U> {
        let mut visitor = FieldVisitor::new();
        t.accept(&mut visitor);
        Ok(visitor.get_value().expect("field is none"))
    }
}

#[cfg(test)]
mod tests {

    use crate::prelude::*;

    #[derive(FieldAccept)]
    struct Records {
        #[visit]
        records: [i32; 3],
    }

    #[tokio::test]
    async fn test_field_visit_procedure() {
        let (tx0, rx0) = channel!(Records, 1024);
        let (tx1, mut rx1) = channel!([i32; 3], 1024);
        let channels = pipe_channels!(rx0, [tx1]);
        let config = config!(FieldVisitConfig);
        let pipe = mapper!("field_visit");
        let f1 = populate_records(tx0, vec![Records { records: [1, 2, 3] }]);
        f1.await;
        join_pipes!([run_pipe!(pipe, config, channels)]);
        let received_records = rx1.recv().await.unwrap();
        assert_eq!([1, 2, 3], received_records)
    }
}