Add v8 crate + initialize v8 (#2939)

Author: Centril

Cargo.lock

@@ -285,6 +285,7 @@ unicode-normalization = "0.1.23"
 url = "2.3.1"
 urlencoding = "2.1.2"
 uuid = { version = "1.2.1", features = ["v4"] }
+v8 = "137.2"
 walkdir = "2.2.5"
 wasmbin = "0.6"
 webbrowser = "1.0.2"

Cargo.toml

@@ -112,6 +112,7 @@ tracing.workspace = true
 url.workspace = true
 urlencoding.workspace = true
 uuid.workspace = true
+v8.workspace = true
 wasmtime.workspace = true
 jwks.workspace = true
 async_cache = "0.3.1"

crates/core/Cargo.toml

@@ -24,17 +24,22 @@ impl ModuleRuntime for V8Runtime {
     }
 }
 
-static V8_RUNTIME_GLOBAL: LazyLock<V8RuntimeInner> = LazyLock::new(V8RuntimeInner::new);
+static V8_RUNTIME_GLOBAL: LazyLock<V8RuntimeInner> = LazyLock::new(V8RuntimeInner::init);
 
 /// The actual V8 runtime, with initialization of V8.
 struct V8RuntimeInner {
     _priv: (),
 }
 
 impl V8RuntimeInner {
-    #[allow(clippy::new_without_default)]
-    const fn new() -> Self {
-        // TODO: actually setup V8.
+    fn init() -> Self {
+        // Our current configuration:
+        // - will pick a number of worker threads for background jobs based on the num CPUs.
+        // - does not allow idle tasks
+        let platform = v8::new_default_platform(0, false).make_shared();
+        // Initialize V8. Internally, this uses a global lock so it's safe that we don't.
+        v8::V8::initialize_platform(platform);
+        v8::V8::initialize();
 
         Self { _priv: () }
     }