mirror of
https://github.com/denoland/deno.git
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86 lines
2.4 KiB
Rust
86 lines
2.4 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use crate::permissions::Permissions;
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use deno_core::error::AnyError;
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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::Resource;
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use deno_core::ResourceId;
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use dlopen::symbor::Library;
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use log::debug;
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use std::borrow::Cow;
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use std::mem;
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use std::path::PathBuf;
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use std::rc::Rc;
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/// A default `init` function for plugins which mimics the way the internal
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/// extensions are initalized. Plugins currently do not support all extension
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/// features and are most likely not going to in the future. Currently only
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/// `init_state` and `init_ops` are supported while `init_middleware` and `init_js`
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/// are not. Currently the `PluginResource` does not support being closed due to
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/// certain risks in unloading the dynamic library without unloading dependent
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/// functions and resources.
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pub type InitFn = fn() -> Extension;
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pub fn init() -> Extension {
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Extension::builder()
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.ops(vec![("op_open_plugin", op_sync(op_open_plugin))])
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.build()
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}
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pub fn op_open_plugin(
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state: &mut OpState,
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filename: String,
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_: (),
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) -> Result<ResourceId, AnyError> {
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let filename = PathBuf::from(&filename);
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super::check_unstable(state, "Deno.openPlugin");
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let permissions = state.borrow_mut::<Permissions>();
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permissions.plugin.check()?;
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debug!("Loading Plugin: {:#?}", filename);
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let plugin_lib = Library::open(filename).map(Rc::new)?;
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let plugin_resource = PluginResource::new(&plugin_lib);
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// Forgets the plugin_lib value to prevent segfaults when the process exits
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mem::forget(plugin_lib);
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let init = *unsafe { plugin_resource.0.symbol::<InitFn>("init") }?;
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let rid = state.resource_table.add(plugin_resource);
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let mut extension = init();
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if !extension.init_js().is_empty() {
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panic!("Plugins do not support loading js");
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}
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if extension.init_middleware().is_some() {
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panic!("Plugins do not support middleware");
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}
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extension.init_state(state)?;
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let ops = extension.init_ops().unwrap_or_default();
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for (name, opfn) in ops {
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state.op_table.register_op(name, opfn);
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}
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Ok(rid)
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}
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struct PluginResource(Rc<Library>);
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impl Resource for PluginResource {
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fn name(&self) -> Cow<str> {
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"plugin".into()
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}
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fn close(self: Rc<Self>) {
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unimplemented!();
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}
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}
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impl PluginResource {
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fn new(lib: &Rc<Library>) -> Self {
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Self(lib.clone())
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}
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}
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