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Extensions allow declarative extensions to "JsRuntime" (ops, state, JS or middleware). This allows for: - `op_crates` to be plug-and-play & self-contained, reducing complexity leaked to consumers - op middleware (like metrics_op) to be opt-in and for new middleware (unstable, tracing,...) - `MainWorker` and `WebWorker` to be composable, allowing users to extend workers with their ops whilst benefiting from the other infrastructure (inspector, etc...) In short extensions improve deno's modularity, reducing complexity and leaky abstractions for embedders and the internal codebase.
56 lines
1.3 KiB
Rust
56 lines
1.3 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::null_opbuf;
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use deno_core::error::AnyError;
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use deno_core::include_js_files;
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use deno_core::op_sync;
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use deno_core::Extension;
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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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use std::path::PathBuf;
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pub use rand; // Re-export rand
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pub fn init(maybe_seed: Option<u64>) -> Extension {
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Extension::with_ops(
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include_js_files!(
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prefix "deno:op_crates/crypto",
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"01_crypto.js",
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),
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vec![(
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"op_crypto_get_random_values",
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op_sync(op_crypto_get_random_values),
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)],
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Some(Box::new(move |state| {
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if let Some(seed) = maybe_seed {
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state.put(StdRng::seed_from_u64(seed));
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}
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Ok(())
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})),
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)
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}
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pub fn op_crypto_get_random_values(
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state: &mut OpState,
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_args: (),
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zero_copy: Option<ZeroCopyBuf>,
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) -> Result<(), AnyError> {
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let mut zero_copy = zero_copy.ok_or_else(null_opbuf)?;
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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);
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} else {
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let mut rng = thread_rng();
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rng.fill(&mut *zero_copy);
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}
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Ok(())
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}
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pub fn get_declaration() -> PathBuf {
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PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("lib.deno_crypto.d.ts")
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}
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