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