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denoland-deno/cli/ops/random.rs

33 lines
810 B
Rust

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use super::dispatch_json::{JsonOp, Value};
use crate::op_error::OpError;
use crate::state::State;
use deno_core::CoreIsolate;
use deno_core::ZeroCopyBuf;
use rand::thread_rng;
use rand::Rng;
use std::rc::Rc;
pub fn init(i: &mut CoreIsolate, s: &Rc<State>) {
i.register_op(
"op_get_random_values",
s.stateful_json_op(op_get_random_values),
);
}
fn op_get_random_values(
state: &Rc<State>,
_args: Value,
zero_copy: &mut [ZeroCopyBuf],
) -> Result<JsonOp, OpError> {
assert_eq!(zero_copy.len(), 1);
if let Some(seeded_rng) = &state.seeded_rng {
seeded_rng.borrow_mut().fill(&mut *zero_copy[0]);
} else {
let mut rng = thread_rng();
rng.fill(&mut *zero_copy[0]);
}
Ok(JsonOp::Sync(json!({})))
}