nautilus_model/identifiers/
strategy_id.rs

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
// -------------------------------------------------------------------------------------------------
//  Copyright (C) 2015-2024 Nautech Systems Pty Ltd. All rights reserved.
//  https://nautechsystems.io
//
//  Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
//  You may not use this file except in compliance with the License.
//  You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
// -------------------------------------------------------------------------------------------------

//! Represents a valid strategy ID.

use std::fmt::{Debug, Display, Formatter};

use nautilus_core::correctness::{check_string_contains, check_valid_string, FAILED};
use ustr::Ustr;

/// The identifier for all 'external' strategy IDs (not local to this system instance).
const EXTERNAL_STRATEGY_ID: &str = "EXTERNAL";

/// Represents a valid strategy ID.
#[repr(C)]
#[derive(Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
#[cfg_attr(
    feature = "python",
    pyo3::pyclass(module = "nautilus_trader.core.nautilus_pyo3.model")
)]
pub struct StrategyId(Ustr);

impl StrategyId {
    /// Creates a new [`StrategyId`] instance.
    ///
    /// Must be correctly formatted with two valid strings either side of a hyphen.
    /// It is expected a strategy ID is the class name of the strategy,
    /// with an order ID tag number separated by a hyphen.
    ///
    /// Example: "EMACross-001".
    ///
    /// The reason for the numerical component of the ID is so that order and position IDs
    /// do not collide with those from another strategy within the node instance.
    ///
    /// # Panics
    ///
    /// This function panics:
    /// - If `value` is not a valid string, or does not contain a hyphen '-' separator.
    pub fn new_checked(value: &str) -> anyhow::Result<Self> {
        check_valid_string(value, stringify!(value))?;
        if value != EXTERNAL_STRATEGY_ID {
            check_string_contains(value, "-", stringify!(value))?;
        }
        Ok(Self(Ustr::from(value)))
    }

    /// Creates a new [`StrategyId`] instance.
    ///
    /// # Panics
    ///
    /// This function panics:
    /// - If `value` is not a valid string.
    pub fn new(value: &str) -> Self {
        Self::new_checked(value).expect(FAILED)
    }

    /// Sets the inner identifier value.
    pub(crate) fn set_inner(&mut self, value: &str) {
        self.0 = Ustr::from(value);
    }

    /// Returns the inner identifier value.
    #[must_use]
    pub fn inner(&self) -> Ustr {
        self.0
    }

    /// Returns the inner identifier value as a string slice.
    #[must_use]
    pub fn as_str(&self) -> &str {
        self.0.as_str()
    }

    #[must_use]
    pub fn external() -> Self {
        // SAFETY:: Constant value is safe
        Self::new(EXTERNAL_STRATEGY_ID)
    }

    #[must_use]
    pub fn is_external(&self) -> bool {
        self.0 == EXTERNAL_STRATEGY_ID
    }

    #[must_use]
    pub fn get_tag(&self) -> &str {
        // SAFETY: Unwrap safe as value previously validated
        self.0.split('-').last().unwrap()
    }
}

impl Debug for StrategyId {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{:?}", self.0)
    }
}

impl Display for StrategyId {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

////////////////////////////////////////////////////////////////////////////////
// Tests
////////////////////////////////////////////////////////////////////////////////
#[cfg(test)]
mod tests {
    use rstest::rstest;

    use super::StrategyId;
    use crate::identifiers::stubs::*;

    #[rstest]
    fn test_string_reprs(strategy_id_ema_cross: StrategyId) {
        assert_eq!(strategy_id_ema_cross.as_str(), "EMACross-001");
        assert_eq!(format!("{strategy_id_ema_cross}"), "EMACross-001");
    }

    #[rstest]
    fn test_get_external() {
        assert_eq!(StrategyId::external().as_str(), "EXTERNAL");
    }

    #[rstest]
    fn test_is_external() {
        assert!(StrategyId::external().is_external());
    }

    #[rstest]
    fn test_get_tag(strategy_id_ema_cross: StrategyId) {
        assert_eq!(strategy_id_ema_cross.get_tag(), "001");
    }
}