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denoland-deno/cli/ops/random.rs
2020-09-28 12:14:11 +02:00

38 lines
1 KiB
Rust

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use deno_core::error::AnyError;
use deno_core::serde_json::json;
use deno_core::serde_json::Value;
use deno_core::OpState;
use deno_core::ZeroCopyBuf;
use rand::rngs::StdRng;
use rand::thread_rng;
use rand::Rng;
use rand::SeedableRng;
pub fn init(rt: &mut deno_core::JsRuntime, maybe_seed: Option<u64>) {
if let Some(seed) = maybe_seed {
let rng = StdRng::seed_from_u64(seed);
let op_state = rt.op_state();
let mut state = op_state.borrow_mut();
state.put::<StdRng>(rng);
}
super::reg_json_sync(rt, "op_get_random_values", op_get_random_values);
}
fn op_get_random_values(
state: &mut OpState,
_args: Value,
zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
assert_eq!(zero_copy.len(), 1);
let maybe_seeded_rng = state.try_borrow_mut::<StdRng>();
if let Some(seeded_rng) = maybe_seeded_rng {
seeded_rng.fill(&mut *zero_copy[0]);
} else {
let mut rng = thread_rng();
rng.fill(&mut *zero_copy[0]);
}
Ok(json!({}))
}