shepherd-rs 0.2.0

Shepherd is a resilient, non-blocking orchestrator that persistently transforms and delivers data—built for remote, compute-heavy workloads.
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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

//! # Mock Transformations
//! 
//! This module provides mock implementations for transformation requests and attempts.
//! 
//! ## Overview
//! - **MockTransformRequest**: Represents a mock transformation request.
//! - **MockTransformAttempt**: Represents a mock transformation attempt.
//! 
//! ## Example
//! ```rust
//! let mock_request = MockTransformRequest::new(...);
//! let mock_attempt = MockTransformAttempt::new(...);
//! ```

use std::collections::HashMap;

use async_trait::async_trait;
use thiserror::Error;

use crate::transform::{TransformAttempt, TransformAttemptCreator, TransformRequest};

#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) struct MockTransformRequest {
    pub(crate) request_id: u64,
    pub(crate) input: String,
    pub(crate) output: String,
}

impl MockTransformRequest {
    pub(crate) fn new(request_id: u64, input: impl ToString, output: impl ToString) -> Self {
        Self {
            request_id,
            input: input.to_string(),
            output: output.to_string(),
        }
    }
}

impl TransformRequest for MockTransformRequest {
    type Identifier = u64;
    type Input = String;
    type Output = String;

    fn request_id(&self) -> Self::Identifier { self.request_id }

    fn input(&self) -> &Self::Input { &self.input }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) struct MockTransformAttempt {
    pub(crate) attempt_id: (u64, u64),
    pub(crate) send_ctx: String,
    pub(crate) send_val: String,
}

#[derive(Error, Debug)]
pub(crate) enum MockTransformError {
    #[error("Mock transform error occurred")]
    MockError,
}

impl TransformAttempt for MockTransformAttempt {
    type Identifier = (u64, u64);
    type ReturnCtx = String;
    type ReturnVal = String;
    type SendCtx = String;
    type SendVal = String;
    type TransformError = MockTransformError;

    fn new(attempt_id: Self::Identifier, send_ctx: Self::SendCtx, send_val: Self::SendVal) -> Self {
        Self {
            attempt_id,
            send_ctx,
            send_val,
        }
    }

    fn send_package(&self) -> Self::SendPackage {
        (
            self.attempt_id,
            self.send_ctx.clone(),
            self.send_val.clone(),
        )
    }
}

pub(crate) struct MockAttemptCreator<TR, TA, IN, OUT>
where
    TR: TransformRequest<Identifier = u64, Input = IN, Output = OUT>,
    TA: TransformAttempt<
            Identifier = (u64, u64),
            SendCtx = String,
            SendVal = IN,
            ReturnCtx = String,
            ReturnVal = OUT,
            TransformError = MockTransformError,
        >,
    IN: Clone + Send,
    OUT: Clone + Send,
{
    pub(crate) attempts_list: HashMap<TR::Identifier, Vec<TA>>,
}

#[async_trait]
impl<TR, TA, IN, OUT> TransformAttemptCreator for MockAttemptCreator<TR, TA, IN, OUT>
where
    TR: TransformRequest<Identifier = u64, Input = IN, Output = OUT>,
    TA: TransformAttempt<
            Identifier = (u64, u64),
            SendCtx = String,
            SendVal = IN,
            ReturnCtx = String,
            ReturnVal = OUT,
            TransformError = MockTransformError,
        >,
    IN: Clone + Send,
    OUT: Clone + Send,
{
    type Input = IN;
    type Output = OUT;
    type TransformAttempt = TA;
    type TransformRequest = TR;

    fn new(capacity: usize) -> Self {
        Self {
            attempts_list: HashMap::with_capacity(capacity),
        }
    }

    async fn create_new_attempt(
        &mut self,
        request: &Self::TransformRequest,
    ) -> Self::TransformAttempt {
        let attempt_id = self
            .attempts_list
            .get(&request.request_id())
            .map_or(0, |attempts| attempts.len() as u64);

        let attempt = Self::TransformAttempt::new(
            (request.request_id(), attempt_id),
            String::from("mock_call_config"),
            request.input().clone(),
        );

        self.attempts_list
            .entry(request.request_id())
            .or_default()
            .push(attempt.clone());

        attempt
    }
}