wasm-dbms-api 0.8.0

Runtime-agnostic API types and traits for the wasm-dbms DBMS engine.
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
153
154
155
156
157
158
159
160
161
162
163

use crate::prelude::{DbmsError, Validate, Value};

/// A validator that checks if the length of a string does not exceed a maximum length.
///
/// # Example
///
/// ```rust
/// use wasm_dbms_api::prelude::{MaxStrlenValidator, Validate, Value, Text};
/// let validator = MaxStrlenValidator(10);
/// let value = Value::Text(Text("Hello".to_string()));
/// assert!(validator.validate(&value).is_ok());
/// let long_value = Value::Text(Text("Hello, World!".to_string()));
/// assert!(validator.validate(&long_value).is_err());
/// ```
pub struct MaxStrlenValidator(pub usize);

impl Validate for MaxStrlenValidator {
    fn validate(&self, value: &Value) -> crate::prelude::DbmsResult<()> {
        let Value::Text(text) = value else {
            return Err(DbmsError::Validation("Value is not a `Text`".to_string()));
        };

        let s = &text.0;

        if s.len() <= self.0 {
            Ok(())
        } else {
            Err(DbmsError::Validation(format!(
                "String length {} exceeds maximum allowed length of {}",
                s.len(),
                self.0
            )))
        }
    }
}

/// A validator that checks if the length of a string is at least a minimum length.
///
/// # Example
/// ```rust
/// use wasm_dbms_api::prelude::{MinStrlenValidator, Validate, Value, Text};
/// let validator = MinStrlenValidator(5);
/// let value = Value::Text(Text("Hello".to_string()));
/// assert!(validator.validate(&value).is_ok());
/// let short_value = Value::Text(Text("Hi".to_string()));
/// assert!(validator.validate(&short_value).is_err());
/// ```
pub struct MinStrlenValidator(pub usize);

impl Validate for MinStrlenValidator {
    fn validate(&self, value: &Value) -> crate::prelude::DbmsResult<()> {
        let Value::Text(text) = value else {
            return Err(DbmsError::Validation("Value is not a `Text`".to_string()));
        };

        let s = &text.0;

        if s.len() >= self.0 {
            Ok(())
        } else {
            Err(DbmsError::Validation(format!(
                "String length {} is less than minimum required length of {}",
                s.len(),
                self.0
            )))
        }
    }
}

/// A validator that checks if the length of a string is within a specified range.
///
/// # Example
///
/// ```rust
/// use wasm_dbms_api::prelude::{RangeStrlenValidator, Validate, Value, Text};
/// let validator = RangeStrlenValidator(3, 10);
/// let value = Value::Text(Text("Hello".to_string()));
/// assert!(validator.validate(&value).is_ok());
/// let short_value = Value::Text(Text("Hi".to_string()));
/// assert!(validator.validate(&short_value).is_err());
/// let long_value = Value::Text(Text("Hello, World!".to_string()));
/// assert!(validator.validate(&long_value).is_err());
/// ```
pub struct RangeStrlenValidator(pub usize, pub usize);

impl Validate for RangeStrlenValidator {
    fn validate(&self, value: &Value) -> crate::prelude::DbmsResult<()> {
        let Value::Text(text) = value else {
            return Err(DbmsError::Validation("Value is not a `Text`".to_string()));
        };

        let s = &text.0;
        let len = s.len();

        if len >= self.0 && len <= self.1 {
            Ok(())
        } else {
            Err(DbmsError::Validation(format!(
                "String length {} is not within the allowed range of {} to {}",
                len, self.0, self.1
            )))
        }
    }
}

#[cfg(test)]
mod tests {

    use super::*;
    use crate::prelude::Text;

    #[test]
    fn test_max_strlen_validator() {
        let validator = MaxStrlenValidator(5);

        let valid_value = Value::Text(Text("Hello".to_string()));
        let invalid_value = Value::Text(Text("Hello, World!".to_string()));

        assert!(validator.validate(&valid_value).is_ok());
        assert!(validator.validate(&invalid_value).is_err());
    }

    #[test]
    fn test_max_strlen_validator_non_text() {
        let validator = MaxStrlenValidator(5);
        let non_text_value = Value::Uint32(crate::prelude::Uint32(42));
        assert!(validator.validate(&non_text_value).is_err());
    }

    #[test]
    fn test_min_strlen_validator() {
        let validator = MinStrlenValidator(5);
        let valid_value = Value::Text(Text("Hello".to_string()));
        let invalid_value = Value::Text(Text("Hi".to_string()));
        assert!(validator.validate(&valid_value).is_ok());
        assert!(validator.validate(&invalid_value).is_err());
    }

    #[test]
    fn test_min_strlen_validator_non_text() {
        let validator = MinStrlenValidator(5);
        let non_text_value = Value::Uint32(crate::prelude::Uint32(42));
        assert!(validator.validate(&non_text_value).is_err());
    }

    #[test]
    fn test_range_strlen_validator() {
        let validator = RangeStrlenValidator(3, 10);
        let valid_value = Value::Text(Text("Hello".to_string()));
        let too_short_value = Value::Text(Text("Hi".to_string()));
        let too_long_value = Value::Text(Text("Hello, World!".to_string()));
        assert!(validator.validate(&valid_value).is_ok());
        assert!(validator.validate(&too_short_value).is_err());
        assert!(validator.validate(&too_long_value).is_err());
    }

    #[test]
    fn test_range_strlen_validator_non_text() {
        let validator = RangeStrlenValidator(3, 10);
        let non_text_value = Value::Uint32(crate::prelude::Uint32(42));
        assert!(validator.validate(&non_text_value).is_err());
    }
}