core: introduce extensions (#9800)

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.

1 files changed, 28 insertions, 21 deletions

diff --git a/runtime/worker.rs b/runtime/worker.rs
index 6dbf8e7ec..fddaf1f01 100644
--- a/runtime/worker.rs
+++ b/runtime/worker.rs
@@ -4,7 +4,7 @@ use crate::inspector::DenoInspector;
 use crate::inspector::InspectorServer;
 use crate::inspector::InspectorSession;
 use crate::js;
-use crate::metrics::RuntimeMetrics;
+use crate::metrics;
 use crate::ops;
 use crate::permissions::Permissions;
 use deno_core::error::AnyError;
@@ -15,6 +15,7 @@ use deno_core::futures::stream::StreamExt;
 use deno_core::serde_json;
 use deno_core::serde_json::json;
 use deno_core::url::Url;
+use deno_core::Extension;
 use deno_core::GetErrorClassFn;
 use deno_core::JsErrorCreateFn;
 use deno_core::JsRuntime;
@@ -77,11 +78,35 @@ impl MainWorker {
     permissions: Permissions,
     options: &WorkerOptions,
   ) -> Self {
+    // Internal modules
+    let extensions: Vec<Extension> = vec![
+      // Web APIs
+      deno_webidl::init(),
+      deno_console::init(),
+      deno_url::init(),
+      deno_web::init(),
+      deno_file::init(options.blob_url_store.clone(), options.location.clone()),
+      deno_fetch::init::<Permissions>(
+        options.user_agent.clone(),
+        options.ca_data.clone(),
+      ),
+      deno_websocket::init::<Permissions>(
+        options.user_agent.clone(),
+        options.ca_data.clone(),
+      ),
+      deno_crypto::init(options.seed),
+      deno_webgpu::init(options.unstable),
+      deno_timers::init::<Permissions>(),
+      // Metrics
+      metrics::init(),
+    ];
+
     let mut js_runtime = JsRuntime::new(RuntimeOptions {
       module_loader: Some(options.module_loader.clone()),
       startup_snapshot: Some(js::deno_isolate_init()),
       js_error_create_fn: options.js_error_create_fn.clone(),
       get_error_class_fn: options.get_error_class_fn,
+      extensions,
       ..Default::default()
     });
 
@@ -109,34 +134,22 @@ impl MainWorker {
       {
         let op_state = js_runtime.op_state();
         let mut op_state = op_state.borrow_mut();
-        op_state.put(RuntimeMetrics::default());
         op_state.put::<Permissions>(permissions);
         op_state.put(ops::UnstableChecker {
           unstable: options.unstable,
         });
       }
 
+      js_runtime.init_extension_ops().unwrap();
+
       ops::runtime::init(js_runtime, main_module);
-      ops::fetch::init(
-        js_runtime,
-        options.user_agent.clone(),
-        options.ca_data.clone(),
-      );
-      ops::timers::init(js_runtime);
       ops::worker_host::init(
         js_runtime,
         None,
         options.create_web_worker_cb.clone(),
       );
-      ops::crypto::init(js_runtime, options.seed);
       ops::reg_sync(js_runtime, "op_close", deno_core::op_close);
       ops::reg_sync(js_runtime, "op_resources", deno_core::op_resources);
-      ops::url::init(js_runtime);
-      ops::file::init(
-        js_runtime,
-        options.blob_url_store.clone(),
-        options.location.clone(),
-      );
       ops::fs_events::init(js_runtime);
       ops::fs::init(js_runtime);
       ops::http::init(js_runtime);
@@ -149,12 +162,6 @@ impl MainWorker {
       ops::signal::init(js_runtime);
       ops::tls::init(js_runtime);
       ops::tty::init(js_runtime);
-      ops::webgpu::init(js_runtime);
-      ops::websocket::init(
-        js_runtime,
-        options.user_agent.clone(),
-        options.ca_data.clone(),
-      );
     }
     {
       let op_state = js_runtime.op_state();