-
Notifications
You must be signed in to change notification settings - Fork 1.4k
/
random.rs
57 lines (45 loc) · 2.02 KB
/
random.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
// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkVM library.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
// http://www.apache.org/licenses/LICENSE-2.0
// 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.
use super::*;
impl<E: Environment> Distribution<StringType<E>> for Standard {
#[inline]
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> StringType<E> {
// Sample a random number up to 1/4th of the maximum bytes.
let num_bytes = rng.gen_range(1..(E::MAX_STRING_BYTES / 4) as usize);
// Sample a random string.
StringType::new(&rng.sample_iter(&Alphanumeric).take(num_bytes).map(char::from).collect::<String>())
}
}
#[cfg(test)]
mod tests {
use super::*;
use snarkvm_console_network_environment::Console;
use std::collections::HashMap;
type CurrentEnvironment = Console;
const ITERATIONS: usize = 100;
#[test]
fn test_random() {
// Initialize a map[string]=>occurences to store all seen random elements.
let mut map = HashMap::with_capacity(ITERATIONS);
let mut rng = TestRng::default();
for _ in 0..ITERATIONS {
// Sample a random value.
let string: StringType<CurrentEnvironment> = Uniform::rand(&mut rng);
// Add the new random value to the set.
map.entry(string).and_modify(|count| *count += 1).or_insert(1);
}
for (string, count) in map {
let allowed_occurences = 1 + ITERATIONS / (string.len() * 10);
assert!(count <= allowed_occurences, "Encountered an element with a count of {}: {}", count, string);
}
}
}