main.go: worker starts go through goWorker (V-575)

Seven copies of add one, go, defer done. The helper keeps the WaitGroup
registration next to the goroutine it counts, so a worker cannot be started
without shutdown waiting for it.

The UnlockFn goroutines keep the shape they had, wg and all.

cmd/mavend/main.go

@@ -578,71 +578,39 @@ func run(args []string) error {
 		}
 	}
 
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
+	goWorker(&wg, func() {
 		if err := srv.Serve(); err != nil && !errors.Is(err, net.ErrClosed) {
 			log.Printf("ipc serve: %v", err)
 		}
-	}()
+	})
 	log.Printf("mavend: ipc listening on %s", srv.Path())
 
 	if !locked && voiceW != nil {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
+		goWorker(&wg, func() {
 			if err := voiceW.server.Serve(); err != nil && !errors.Is(err, net.ErrClosed) {
 				log.Printf("voice serve: %v", err)
 			}
-		}()
+		})
 		log.Printf("mavend: voice listening on %s", voiceW.server.Addr())
 	}
 
 	if !locked {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			tl.run(ctx)
-		}()
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			factWorker.run(ctx)
-		}()
+		goWorker(&wg, func() { tl.run(ctx) })
+		goWorker(&wg, func() { factWorker.run(ctx) })
 		if evalWorker != nil {
-			wg.Add(1)
-			go func() {
-				defer wg.Done()
-				evalWorker.run(ctx)
-			}()
+			goWorker(&wg, func() { evalWorker.run(ctx) })
 		}
 		if feedWkr != nil {
-			wg.Add(1)
-			go func() {
-				defer wg.Done()
-				feedWkr.run(ctx)
-			}()
+			goWorker(&wg, func() { feedWkr.run(ctx) })
 		}
 		if crawlWkr != nil {
-			wg.Add(1)
-			go func() {
-				defer wg.Done()
-				crawlWkr.run(ctx)
-			}()
+			goWorker(&wg, func() { crawlWkr.run(ctx) })
 		}
 		if voiceW != nil && voiceW.mcp != nil {
-			wg.Add(1)
-			go func() {
-				defer wg.Done()
-				voiceW.mcp.run(ctx)
-			}()
+			goWorker(&wg, func() { voiceW.mcp.run(ctx) })
 		}
 		if voiceW != nil && voiceW.home != nil {
-			wg.Add(1)
-			go func() {
-				defer wg.Done()
-				voiceW.home.run(ctx)
-			}()
+			goWorker(&wg, func() { voiceW.home.run(ctx) })
 		}
 	}
 
@@ -839,6 +807,16 @@ func wireTickLoop(st *store.Store, gatherer *loop.Gatherer, dispatcher *delivery
 		cfg.PatternProposals)
 }
 
+// goWorker starts run on its own goroutine and registers it with wg, so
+// shutdown can wait for it inside workerGrace.
+func goWorker(wg *sync.WaitGroup, run func()) {
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		run()
+	}()
+}
+
 // wireRules builds the nudge rule set, minus anything config turned off. The
 // drop is logged because a rule vanishing silently is indistinguishable from a
 // rule that is broken, and the next person to wonder why she stopped nudging