mirror of
https://github.com/denoland/deno.git
synced 2024-11-14 16:33:45 -05:00
128 lines
3.4 KiB
Rust
128 lines
3.4 KiB
Rust
use crate::error::AnyError;
|
|
use crate::{OpFn, OpState};
|
|
|
|
pub type SourcePair = (&'static str, &'static str);
|
|
pub type OpPair = (&'static str, Box<OpFn>);
|
|
pub type OpMiddlewareFn = dyn Fn(&'static str, Box<OpFn>) -> Box<OpFn>;
|
|
pub type OpStateFn = dyn Fn(&mut OpState) -> Result<(), AnyError>;
|
|
|
|
#[derive(Default)]
|
|
pub struct Extension {
|
|
js_files: Option<Vec<SourcePair>>,
|
|
ops: Option<Vec<OpPair>>,
|
|
opstate_fn: Option<Box<OpStateFn>>,
|
|
middleware_fn: Option<Box<OpMiddlewareFn>>,
|
|
initialized: bool,
|
|
}
|
|
|
|
// Note: this used to be a trait, but we "downgraded" it to a single concrete type
|
|
// for the initial iteration, it will likely become a trait in the future
|
|
impl Extension {
|
|
pub fn builder() -> ExtensionBuilder {
|
|
Default::default()
|
|
}
|
|
|
|
/// returns JS source code to be loaded into the isolate (either at snapshotting,
|
|
/// or at startup). as a vector of a tuple of the file name, and the source code.
|
|
pub(crate) fn init_js(&self) -> Vec<SourcePair> {
|
|
match &self.js_files {
|
|
Some(files) => files.clone(),
|
|
None => vec![],
|
|
}
|
|
}
|
|
|
|
/// Called at JsRuntime startup to initialize ops in the isolate.
|
|
pub(crate) fn init_ops(&mut self) -> Option<Vec<OpPair>> {
|
|
// TODO(@AaronO): maybe make op registration idempotent
|
|
if self.initialized {
|
|
panic!("init_ops called twice: not idempotent or correct");
|
|
}
|
|
self.initialized = true;
|
|
|
|
self.ops.take()
|
|
}
|
|
|
|
/// Allows setting up the initial op-state of an isolate at startup.
|
|
pub(crate) fn init_state(&self, state: &mut OpState) -> Result<(), AnyError> {
|
|
match &self.opstate_fn {
|
|
Some(ofn) => ofn(state),
|
|
None => Ok(()),
|
|
}
|
|
}
|
|
|
|
/// init_middleware lets us middleware op registrations, it's called before init_ops
|
|
pub(crate) fn init_middleware(&mut self) -> Option<Box<OpMiddlewareFn>> {
|
|
self.middleware_fn.take()
|
|
}
|
|
}
|
|
|
|
// Provides a convenient builder pattern to declare Extensions
|
|
#[derive(Default)]
|
|
pub struct ExtensionBuilder {
|
|
js: Vec<SourcePair>,
|
|
ops: Vec<OpPair>,
|
|
state: Option<Box<OpStateFn>>,
|
|
middleware: Option<Box<OpMiddlewareFn>>,
|
|
}
|
|
|
|
impl ExtensionBuilder {
|
|
pub fn js(&mut self, js_files: Vec<SourcePair>) -> &mut Self {
|
|
self.js.extend(js_files);
|
|
self
|
|
}
|
|
|
|
pub fn ops(&mut self, ops: Vec<OpPair>) -> &mut Self {
|
|
self.ops.extend(ops);
|
|
self
|
|
}
|
|
|
|
pub fn state<F>(&mut self, opstate_fn: F) -> &mut Self
|
|
where
|
|
F: Fn(&mut OpState) -> Result<(), AnyError> + 'static,
|
|
{
|
|
self.state = Some(Box::new(opstate_fn));
|
|
self
|
|
}
|
|
|
|
pub fn middleware<F>(&mut self, middleware_fn: F) -> &mut Self
|
|
where
|
|
F: Fn(&'static str, Box<OpFn>) -> Box<OpFn> + 'static,
|
|
{
|
|
self.middleware = Some(Box::new(middleware_fn));
|
|
self
|
|
}
|
|
|
|
pub fn build(&mut self) -> Extension {
|
|
let js_files = Some(std::mem::take(&mut self.js));
|
|
let ops = Some(std::mem::take(&mut self.ops));
|
|
Extension {
|
|
js_files,
|
|
ops,
|
|
opstate_fn: self.state.take(),
|
|
middleware_fn: self.middleware.take(),
|
|
initialized: false,
|
|
}
|
|
}
|
|
}
|
|
/// Helps embed JS files in an extension. Returns Vec<(&'static str, &'static str)>
|
|
/// representing the filename and source code.
|
|
///
|
|
/// Example:
|
|
/// ```ignore
|
|
/// include_js_files!(
|
|
/// prefix "deno:extensions/hello",
|
|
/// "01_hello.js",
|
|
/// "02_goodbye.js",
|
|
/// )
|
|
/// ```
|
|
#[macro_export]
|
|
macro_rules! include_js_files {
|
|
(prefix $prefix:literal, $($file:literal,)+) => {
|
|
vec![
|
|
$((
|
|
concat!($prefix, "/", $file),
|
|
include_str!($file),
|
|
),)+
|
|
]
|
|
};
|
|
}
|