Add an gRPC server example

examples/go.mod

@@ -0,0 +1,18 @@
+module github.com/cloudflare/tableflip/examples
+
+go 1.19
+
+require (
+	github.com/cloudflare/tableflip v1.2.3
+	google.golang.org/grpc v1.55.0
+	google.golang.org/grpc/examples v0.0.0-20230505230727-c44f77e12db9
+)
+
+require (
+	github.com/golang/protobuf v1.5.3 // indirect
+	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+)

examples/go.sum

@@ -0,0 +1,25 @@
+github.com/cloudflare/tableflip v1.2.3 h1:8I+B99QnnEWPHOY3fWipwVKxS70LGgUsslG7CSfmHMw=
+github.com/cloudflare/tableflip v1.2.3/go.mod h1:P4gRehmV6Z2bY5ao5ml9Pd8u6kuEnlB37pUFMmv7j2E=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
+golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
+golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
+google.golang.org/grpc v1.55.0 h1:3Oj82/tFSCeUrRTg/5E/7d/W5A1tj6Ky1ABAuZuv5ag=
+google.golang.org/grpc v1.55.0/go.mod h1:iYEXKGkEBhg1PjZQvoYEVPTDkHo1/bjTnfwTeGONTY8=
+google.golang.org/grpc/examples v0.0.0-20230505230727-c44f77e12db9 h1:dLigjJQz/+CEgbkMtxVb9L3h1cI6I0ziei0huUyOuIE=
+google.golang.org/grpc/examples v0.0.0-20230505230727-c44f77e12db9/go.mod h1:irORyHPQXotoshbRTZVFvPDcfTfFHL23efQeop+H45M=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=

examples/grpc_example_test.go

@@ -0,0 +1,94 @@
+package examples_test
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/cloudflare/tableflip"
+	"google.golang.org/grpc"
+	pb "google.golang.org/grpc/examples/helloworld/helloworld"
+)
+
+// This shows how to use the upgrader
+// with the graceful shutdown facilities of grpc server.
+func Example_GrpcServerShutdown() {
+	var (
+		listenAddr = flag.String("listen", "localhost:8080", "`Address` to listen on")
+		pidFile    = flag.String("pid-file", "", "`Path` to pid file")
+	)
+
+	flag.Parse()
+	log.SetPrefix(fmt.Sprintf("%d ", os.Getpid()))
+
+	upg, err := tableflip.New(tableflip.Options{
+		PIDFile: *pidFile,
+	})
+	if err != nil {
+		panic(err)
+	}
+	defer upg.Stop()
+
+	// Do an upgrade on SIGHUP
+	go func() {
+		sig := make(chan os.Signal, 1)
+		signal.Notify(sig, syscall.SIGHUP)
+		for range sig {
+			err := upg.Upgrade()
+			if err != nil {
+				log.Println("Upgrade failed:", err)
+			}
+		}
+	}()
+
+	// Listen must be called before Ready
+	ln, err := upg.Fds.Listen("tcp", *listenAddr)
+	if err != nil {
+		log.Fatalln("Can't listen:", err)
+	}
+
+	// set rpc server
+	s := grpc.NewServer()                  // create rpc server
+	pb.RegisterGreeterServer(s, &server{}) // register service
+	go func() {
+		err := s.Serve(ln)
+		log.Printf("server listening at %v", ln.Addr())
+		if err != http.ErrServerClosed {
+			log.Printf("failed to serve: %v", err)
+		}
+	}()
+
+	log.Printf("ready")
+	if err := upg.Ready(); err != nil {
+		panic(err)
+	}
+	<-upg.Exit()
+
+	// Make sure to set a deadline on exiting the process
+	// after upg.Exit() is closed. No new upgrades can be
+	// performed if the parent doesn't exit.
+	time.AfterFunc(30*time.Second, func() {
+		log.Println("Graceful shutdown timed out")
+		os.Exit(1)
+	})
+
+	// Wait for the server gracefully stops
+	s.GracefulStop()
+}
+
+// server is used to implement helloworld.GreeterServer.
+type server struct {
+	pb.UnimplementedGreeterServer
+}
+
+// SayHello implements helloworld.GreeterServer
+func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
+	log.Printf("Received: %v", in.GetName())
+	return &pb.HelloReply{Message: fmt.Sprintf("Hello %s", in.GetName())}, nil
+}

http_example_test.go → examples/http_example_test.go

@@ -1,4 +1,4 @@
-package tableflip_test
+package examples_test
 
 import (
 	"context"

tcp_example_test.go → examples/tcp_example_test.go

@@ -1,4 +1,4 @@
-package tableflip_test
+package examples_test
 
 import (
 	"flag"

go.sum

@@ -1,2 +1,131 @@
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