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denoland-deno/runtime/ops/plugin.rs

150 lines
3.9 KiB
Rust

// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
use crate::metrics::metrics_op;
use crate::permissions::Permissions;
use deno_core::error::AnyError;
use deno_core::futures::prelude::*;
use deno_core::plugin_api;
use deno_core::JsRuntime;
use deno_core::Op;
use deno_core::OpAsyncFuture;
use deno_core::OpFn;
use deno_core::OpId;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use dlopen::symbor::Library;
use log::debug;
use std::borrow::Cow;
use std::path::PathBuf;
use std::pin::Pin;
use std::rc::Rc;
use std::task::Context;
use std::task::Poll;
pub fn init(rt: &mut JsRuntime) {
super::reg_sync(rt, "op_open_plugin", op_open_plugin);
}
pub fn op_open_plugin(
state: &mut OpState,
filename: String,
_zero_copy: Option<ZeroCopyBuf>,
) -> Result<ResourceId, AnyError> {
let filename = PathBuf::from(&filename);
super::check_unstable(state, "Deno.openPlugin");
let permissions = state.borrow_mut::<Permissions>();
permissions.plugin.check()?;
debug!("Loading Plugin: {:#?}", filename);
let plugin_lib = Library::open(filename).map(Rc::new)?;
let plugin_resource = PluginResource::new(&plugin_lib);
let rid;
let deno_plugin_init;
{
rid = state.resource_table.add(plugin_resource);
deno_plugin_init = *unsafe {
state
.resource_table
.get::<PluginResource>(rid)
.unwrap()
.lib
.symbol::<plugin_api::InitFn>("deno_plugin_init")
.unwrap()
};
}
let mut interface = PluginInterface::new(state, &plugin_lib);
deno_plugin_init(&mut interface);
Ok(rid)
}
struct PluginResource {
lib: Rc<Library>,
}
impl Resource for PluginResource {
fn name(&self) -> Cow<str> {
"plugin".into()
}
}
impl PluginResource {
fn new(lib: &Rc<Library>) -> Self {
Self { lib: lib.clone() }
}
}
struct PluginInterface<'a> {
state: &'a mut OpState,
plugin_lib: &'a Rc<Library>,
}
impl<'a> PluginInterface<'a> {
fn new(state: &'a mut OpState, plugin_lib: &'a Rc<Library>) -> Self {
Self { state, plugin_lib }
}
}
impl<'a> plugin_api::Interface for PluginInterface<'a> {
/// Does the same as `core::Isolate::register_op()`, but additionally makes
/// the registered op dispatcher, as well as the op futures created by it,
/// keep reference to the plugin `Library` object, so that the plugin doesn't
/// get unloaded before all its op registrations and the futures created by
/// them are dropped.
fn register_op(
&mut self,
name: &str,
dispatch_op_fn: plugin_api::DispatchOpFn,
) -> OpId {
let plugin_lib = self.plugin_lib.clone();
let plugin_op_fn: Box<OpFn> = Box::new(move |state_rc, _payload, buf| {
let mut state = state_rc.borrow_mut();
let mut interface = PluginInterface::new(&mut state, &plugin_lib);
let op = dispatch_op_fn(&mut interface, buf);
match op {
sync_op @ Op::Sync(..) => sync_op,
Op::Async(fut) => Op::Async(PluginOpAsyncFuture::new(&plugin_lib, fut)),
Op::AsyncUnref(fut) => {
Op::AsyncUnref(PluginOpAsyncFuture::new(&plugin_lib, fut))
}
_ => unreachable!(),
}
});
self.state.op_table.register_op(
name,
metrics_op(Box::leak(Box::new(name.to_string())), plugin_op_fn),
)
}
}
struct PluginOpAsyncFuture {
fut: Option<OpAsyncFuture>,
_plugin_lib: Rc<Library>,
}
impl PluginOpAsyncFuture {
fn new(plugin_lib: &Rc<Library>, fut: OpAsyncFuture) -> Pin<Box<Self>> {
let wrapped_fut = Self {
fut: Some(fut),
_plugin_lib: plugin_lib.clone(),
};
Box::pin(wrapped_fut)
}
}
impl Future for PluginOpAsyncFuture {
type Output = <OpAsyncFuture as Future>::Output;
fn poll(mut self: Pin<&mut Self>, ctx: &mut Context) -> Poll<Self::Output> {
self.fut.as_mut().unwrap().poll_unpin(ctx)
}
}
impl Drop for PluginOpAsyncFuture {
fn drop(&mut self) {
self.fut.take();
}
}