print message when starting api server

example/bookstore/api/bookstore.go

@@ -1,10 +1,12 @@
 package main
 
 import (
+	"flag"
+	"fmt"
+
 	"bookstore/api/internal/config"
 	"bookstore/api/internal/handler"
 	"bookstore/api/internal/svc"
-	"flag"
 
 	"github.com/tal-tech/go-zero/core/conf"
 	"github.com/tal-tech/go-zero/rest"
@@ -23,5 +25,7 @@ func main() {
 	defer server.Stop()
 
 	handler.RegisterHandlers(server, ctx)
+
+	fmt.Printf("Starting server at %s:%d...\n", c.Host, c.Port)
 	server.Start()
 }

example/bookstore/rpc/add/add.go

@@ -4,15 +4,16 @@
 package main
 
 import (
+	"flag"
+	"fmt"
+
 	"bookstore/rpc/add/internal/config"
 	"bookstore/rpc/add/internal/server"
 	"bookstore/rpc/add/internal/svc"
 	add "bookstore/rpc/add/pb"
-	"flag"
-	"fmt"
-	"log"
 
 	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/core/logx"
 	"github.com/tal-tech/go-zero/rpcx"
 	"google.golang.org/grpc"
 )
@@ -30,9 +31,7 @@ func main() {
 	s, err := rpcx.NewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
 		add.RegisterAdderServer(grpcServer, adderSrv)
 	})
-	if err != nil {
-		log.Fatal(err)
-	}
+	logx.Must(err)
 
 	fmt.Printf("Starting rpc server at %s...\n", c.ListenOn)
 	s.Start()

example/bookstore/rpc/check/check.go

@@ -4,15 +4,16 @@
 package main
 
 import (
+	"flag"
+	"fmt"
+
 	"bookstore/rpc/check/internal/config"
 	"bookstore/rpc/check/internal/server"
 	"bookstore/rpc/check/internal/svc"
 	check "bookstore/rpc/check/pb"
-	"flag"
-	"fmt"
-	"log"
 
 	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/core/logx"
 	"github.com/tal-tech/go-zero/rpcx"
 	"google.golang.org/grpc"
 )
@@ -30,9 +31,7 @@ func main() {
 	s, err := rpcx.NewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
 		check.RegisterCheckerServer(grpcServer, checkerSrv)
 	})
-	if err != nil {
-		log.Fatal(err)
-	}
+	logx.Must(err)
 
 	fmt.Printf("Starting rpc server at %s...\n", c.ListenOn)
 	s.Start()

example/syncx/sharedcalls/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/tal-tech/go-zero/core/stringx"
+	"github.com/tal-tech/go-zero/core/syncx"
+)
+
+func main() {
+	const round = 5
+	var wg sync.WaitGroup
+	barrier := syncx.NewSharedCalls()
+
+	wg.Add(round)
+	for i := 0; i < round; i++ {
+		go func() {
+			defer wg.Done()
+			val, err := barrier.Do("once", func() (interface{}, error) {
+				time.Sleep(time.Second)
+				return stringx.RandId(), nil
+			})
+			if err != nil {
+				fmt.Println(err)
+			} else {
+				fmt.Println(val)
+			}
+		}()
+	}
+
+	wg.Wait()
+}