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