Implement Turbopack trace server bindings (vercel#65410)

## What?

Implements support for running the Turbopack trace server, which is the
websocket server that powers https://turbo-trace-viewer.vercel.app/ when
using `NEXT_TURBOPACK_TRACING=1 NEXT_TURBOPACK_TRACE_SERVER=1`.

Currently you have to manually run the server through the Turbo
repository which in practice means that only people working on Turbopack
are able to run it.

With the bindings implemented anyone should be able to run the trace
server.

Note that the traces that come out of Turbopack are very low level,
they're meant for optimizing Turbopack like finding slowdowns / large
memory usage / optimizing performance.

However, it's useful for people that want to peek into why their
application is slow to compile. I.e. we've used
https://turbo-trace-viewer.vercel.app to investigate reports in vercel#48748.

This PR adds support for `trace.log` by default, so if you add
`NEXT_TURBOPACK_TRACING=1 NEXT_TURBOPACK_TRACE_SERVER=1` it will
automatically select the `trace.log` for the current instance of
Next.js. You can only have one trace server running at the same time.

### `next internal` 

In order to support running the trace server standalone, which is useful
for investigating trace files other people have shared, I've added a new
subcommand `internal` that is not covered by semver / use at your own
risk. It's meant for internal tools that are useful to be bound to the
version of Next.js, the turbo-trace-server is a great example of that as
it has an internal binary format for storing data that needs to match
the trace.log file.

If you want to take a look at `.next/trace` instead the new `next
internal` subcommand can be used for that:

```sh
# Replace [path] with a path to a file.
next internal turbo-trace-server [path]
```

For example:

```sh
next internal turbo-trace-server ~/Downloads/trace
```

Currently the trace server does not support loading multiple files, just
hasn't been implemented yet. Once we can load two or more files we can
load both `.next/trace` and `trace.log` when
`NEXT_TURBOPACK_TRACE_SERVER=1` and support multiple paths passed to
`next internal turbo-trace-server`.


### Turbopack upgrade


PR includes a Turbopack upgrade:

* vercel/turborepo#8073 <!-- OJ Kwon -
feat(webpack-loaders): support dummy span interface -->
* vercel/turborepo#8083 <!-- OJ Kwon - fix(webpack):
print resource, project path when relative calc fails -->
* vercel/turborepo#8094 <!-- Tim Neutkens -
Implement bindings for Turbopack trace server -->


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Closes NEXT-3328

Cargo.toml

@@ -37,11 +37,11 @@ swc_core = { version = "0.90.33", features = [
 testing = { version = "0.35.22" }
 
 # Turbo crates
-turbopack-binding = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240503.1" }
+turbopack-binding = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240506.2" }
 # [TODO]: need to refactor embed_directory! macro usages, as well as resolving turbo_tasks::function, macros..
-turbo-tasks = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240503.1" }
+turbo-tasks = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240506.2" }
 # [TODO]: need to refactor embed_directory! macro usage in next-core
-turbo-tasks-fs = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240503.1" }
+turbo-tasks-fs = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240506.2" }
 
 # General Deps
 

packages/next-swc/crates/napi/src/lib.rs

@@ -58,6 +58,8 @@ pub mod next_api;
 pub mod parse;
 pub mod transform;
 #[cfg(not(target_arch = "wasm32"))]
+pub mod turbo_trace_server;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod turbopack;
 #[cfg(not(target_arch = "wasm32"))]
 pub mod turbotrace;

packages/next-swc/crates/napi/src/next_api/project.rs

@@ -1,4 +1,4 @@
-use std::{path::PathBuf, sync::Arc, time::Duration};
+use std::{path::PathBuf, sync::Arc, thread, time::Duration};
 
 use anyhow::{anyhow, bail, Context, Result};
 use napi::{
@@ -249,12 +249,22 @@ pub async fn project_new(
             .context("Unable to create .next directory")
             .unwrap();
         let trace_file = internal_dir.join("trace.log");
-        let trace_writer = std::fs::File::create(trace_file).unwrap();
+        let trace_writer = std::fs::File::create(trace_file.clone()).unwrap();
         let (trace_writer, guard) = TraceWriter::new(trace_writer);
         let subscriber = subscriber.with(RawTraceLayer::new(trace_writer));
 
         let guard = ExitGuard::new(guard).unwrap();
 
+        let trace_server = std::env::var("NEXT_TURBOPACK_TRACE_SERVER").ok();
+        if trace_server.is_some() {
+            thread::spawn(move || {
+                turbopack_binding::turbopack::trace_server::start_turbopack_trace_server(
+                    trace_file,
+                );
+            });
+            println!("Turbopack trace server started. View trace at https://turbo-trace-viewer.vercel.app/");
+        }
+
         subscriber.init();
 
         Some(guard)

packages/next-swc/crates/napi/src/turbo_trace_server.rs

@@ -0,0 +1,7 @@
+use std::path::PathBuf;
+
+#[napi]
+pub fn start_turbopack_trace_server(path: String) {
+    let path_buf = PathBuf::from(path);
+    turbopack_binding::turbopack::trace_server::start_turbopack_trace_server(path_buf);
+}

packages/next-swc/crates/next-core/Cargo.toml

@@ -55,6 +55,7 @@ turbopack-binding = { workspace = true, features = [
   "__turbopack_image",
   "__turbopack_node",
   "__turbopack_trace_utils",
+  "__turbopack_trace_server",
 ] }
 
 turbo-tasks = { workspace = true }

packages/next/package.json

@@ -200,7 +200,7 @@
     "@types/ws": "8.2.0",
     "@vercel/ncc": "0.34.0",
     "@vercel/nft": "0.26.4",
-    "@vercel/turbopack-ecmascript-runtime": "https://gitpkg-fork.vercel.sh/vercel/turbo/crates/turbopack-ecmascript-runtime/js?turbopack-240503.1",
+    "@vercel/turbopack-ecmascript-runtime": "https://gitpkg-fork.vercel.sh/vercel/turbo/crates/turbopack-ecmascript-runtime/js?turbopack-240506.2",
     "acorn": "8.5.0",
     "amphtml-validator": "1.0.35",
     "anser": "1.4.9",

packages/next/src/bin/next.ts

@@ -383,4 +383,19 @@ program
   })
   .usage('[directory] [options]')
 
+const internal = program
+  .command('internal')
+  .description(
+    'Internal debugging commands. Use with caution. Not covered by semver.'
+  )
+
+internal
+  .command('turbo-trace-server')
+  .argument('[file]', 'Trace file to serve.')
+  .action((file) => {
+    return import('../cli/internal/turbo-trace-server.js').then((mod) =>
+      mod.startTurboTraceServerCli(file)
+    )
+  })
+
 program.parse(process.argv)

packages/next/src/build/swc/index.ts

@@ -137,7 +137,7 @@ let lastNativeBindingsLoadErrorCode:
   | 'unsupported_target'
   | string
   | undefined = undefined
-let nativeBindings: any
+let nativeBindings: Binding
 let wasmBindings: any
 let downloadWasmPromise: any
 let pendingBindings: any
@@ -157,21 +157,21 @@ export interface Binding {
       stream: any
       get: any
     }
-    mdx: {
-      compile: any
-      compileSync: any
-    }
     createProject: (
       options: ProjectOptions,
       turboEngineOptions?: TurboEngineOptions
     ) => Promise<Project>
+    startTurbopackTraceServer: (path: string) => void
+  }
+  mdx: {
+    compile: any
+    compileSync: any
   }
   minify: any
   minifySync: any
   transform: any
   transformSync: any
   parse: any
-  parseSync: any
 
   getTargetTriple(): string | undefined
 
@@ -752,7 +752,10 @@ function rustifyEnv(env: Record<string, string>): RustifiedEnv {
 }
 
 // TODO(sokra) Support wasm option.
-function bindingToApi(binding: any, _wasm: boolean) {
+function bindingToApi(
+  binding: any,
+  _wasm: boolean
+): Binding['turbo']['createProject'] {
   type NativeFunction<T> = (
     callback: (err: Error, value: T) => void
   ) => Promise<{ __napiType: 'RootTask' }>
@@ -1194,10 +1197,10 @@ function bindingToApi(binding: any, _wasm: boolean) {
     }
   }
 
-  async function createProject(
-    options: ProjectOptions,
-    turboEngineOptions: TurboEngineOptions
-  ) {
+  const createProject: Binding['turbo']['createProject'] = async (
+    options,
+    turboEngineOptions
+  ) => {
     return new ProjectImpl(
       await binding.projectNew(
         await rustifyProjectOptions(options),
@@ -1255,9 +1258,6 @@ async function loadWasm(importPath = '') {
             ? bindings.parse(src.toString(), options)
             : Promise.resolve(bindings.parseSync(src.toString(), options))
         },
-        parseSync(src: string, options: any) {
-          return bindings.parseSync(src.toString(), options)
-        },
         getTargetTriple() {
           return undefined
         },
@@ -1483,6 +1483,12 @@ function loadNative(importPath?: string) {
           },
         },
         createProject: bindingToApi(customBindings ?? bindings, false),
+        startTurbopackTraceServer: (traceFilePath) => {
+          Log.warn(
+            'Turbopack trace server started. View trace at https://turbo-trace-viewer.vercel.app/'
+          )
+          ;(customBindings ?? bindings).startTurbopackTraceServer(traceFilePath)
+        },
       },
       mdx: {
         compile: (src: string, options: any) =>

packages/next/src/cli/internal/turbo-trace-server.ts

@@ -0,0 +1,6 @@
+import { loadBindings } from '../../build/swc'
+
+export async function startTurboTraceServerCli(file: string) {
+  let bindings = await loadBindings()
+  bindings.turbo.startTurbopackTraceServer(file)
+}