Set process.title for router and render workers (#52779)

- Adds `next-router-worker` as the process title for the routing worker.
- Adds `next-render-worker-app` as the process title for the rendering
worker for `app`
- Adds `next-render-worker-pages` as the process title for the rendering
worker for `pages`

Currently it's hard to find these processes in e.g. activity monitor,
this helps explain what they are used for when someone is looking at the
running processes.

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packages/next/src/server/lib/render-server.ts

@@ -61,6 +61,16 @@ export async function initialize(opts: {
   if (result) {
     return result
   }
+
+  const isRouterWorker = opts.workerType === 'router'
+  const isRenderWorker = opts.workerType === 'render'
+  if (isRouterWorker) {
+    process.title = 'next-router-worker'
+  } else if (isRenderWorker) {
+    const type = process.env.__NEXT_PRIVATE_RENDER_WORKER!
+    process.title = 'next-render-worker-' + type
+  }
+
   let requestHandler: RequestHandler
 
   const server = http.createServer((req, res) => {
@@ -126,8 +136,8 @@ export async function initialize(opts: {
         }
         const app = next({
           ...opts,
-          _routerWorker: opts.workerType === 'router',
-          _renderWorker: opts.workerType === 'render',
+          _routerWorker: isRouterWorker,
+          _renderWorker: isRenderWorker,
           hostname,
           customServer: false,
           httpServer: server,

test/development/basic/node-builtins.test.ts

@@ -86,7 +86,7 @@ createNextDescribe(
       expect(parsedData.https).toBe(true)
       expect(parsedData.os).toBe('\n')
       expect(parsedData.path).toBe('/hello/world/test.txt')
-      expect(parsedData.process).toInclude('node')
+      expect(parsedData.process).toInclude('next-render-worker-pages')
       expect(parsedData.querystring).toBe('a=b')
       expect(parsedData.stringDecoder).toBe(true)
       expect(parsedData.sys).toBe(true)
@@ -112,7 +112,7 @@ createNextDescribe(
       expect(parsedData.https).toBe(true)
       expect(parsedData.os).toBe('\n')
       expect(parsedData.path).toBe('/hello/world/test.txt')
-      expect(parsedData.process).toInclude('node')
+      expect(parsedData.process).toInclude('next-render-worker-pages')
       expect(parsedData.querystring).toBe('a=b')
       expect(parsedData.stringDecoder).toBe(true)
       expect(parsedData.sys).toBe(true)
@@ -138,7 +138,7 @@ createNextDescribe(
       expect(parsedData.https).toBe(true)
       expect(parsedData.os).toBe('\n')
       expect(parsedData.path).toBe('/hello/world/test.txt')
-      expect(parsedData.process).toInclude('node')
+      expect(parsedData.process).toInclude('next-render-worker-app')
       expect(parsedData.querystring).toBe('a=b')
       expect(parsedData.stringDecoder).toBe(true)
       expect(parsedData.sys).toBe(true)
@@ -164,7 +164,7 @@ createNextDescribe(
       expect(parsedData.https).toBe(true)
       expect(parsedData.os).toBe('\n')
       expect(parsedData.path).toBe('/hello/world/test.txt')
-      expect(parsedData.process).toInclude('node')
+      expect(parsedData.process).toInclude('next-render-worker-app')
       expect(parsedData.querystring).toBe('a=b')
       expect(parsedData.stringDecoder).toBe(true)
       expect(parsedData.sys).toBe(true)