Add GRPC service

README.md

@@ -95,4 +95,14 @@ lt.Start(service)
 
 #### GRPC Server
 
-Coming soon...
+```
+// Create and register GRPC server.
+var server *grpc.Server
+// Register GRPC server implementation...
+
+// Create GRPC service, giving it the GRPC server and a listen address.
+service := lifetime.NewGRPCService(server, ":9000")
+
+// Start the service.
+lt.Start(service)
+```

go.mod

@@ -1,3 +1,13 @@
 module github.com/tomwright/lifetime
 
 go 1.13
+
+require (
+	github.com/golang/protobuf v1.4.2 // indirect
+	golang.org/x/net v0.0.0-20200822124328-c89045814202 // indirect
+	golang.org/x/sys v0.0.0-20200824131525-c12d262b63d8 // indirect
+	golang.org/x/text v0.3.3 // indirect
+	google.golang.org/genproto v0.0.0-20200815001618-f69a88009b70 // indirect
+	google.golang.org/grpc v1.31.0 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
+)

go.sum

@@ -0,0 +1,92 @@
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service_grpc.go

@@ -0,0 +1,49 @@
+package lifetime
+
+import (
+	"fmt"
+	"google.golang.org/grpc"
+	"net"
+)
+
+// NewGRPCService returns a service that will run listen and serve the given
+// GRPC server.
+func NewGRPCService(server *grpc.Server, listenAddress string) Service {
+	return &grpcService{
+		server:        server,
+		listenAddress: listenAddress,
+	}
+}
+
+// grpcService is an implementation of Service that will listen and serve the given
+// HTTP server.
+type grpcService struct {
+	server        *grpc.Server
+	listenAddress string
+}
+
+// Start will start the service.
+// This is a blocking call and should block for the lifetime of the service.
+// Returns an error which is treated as fatal.
+func (service *grpcService) Start() error {
+	lis, err := net.Listen("tcp", service.listenAddress)
+	if err != nil {
+		return fmt.Errorf("could not listen on tcp address: %w", err)
+	}
+	err = service.server.Serve(lis)
+	if err == nil {
+		return nil
+	}
+	// ErrServerStopped is returned when we call server.Close() from Service.Stop
+	// so we shouldn't treat it as a breaking error.
+	if err == grpc.ErrServerStopped {
+		return nil
+	}
+	return err
+}
+
+// Stop will stop the service.
+// Stop is not called if Start returned an error.
+func (service *grpcService) Stop() {
+	service.server.GracefulStop()
+}

service_http.go

@@ -1,6 +1,8 @@
 package lifetime
 
-import "net/http"
+import (
+	"net/http"
+)
 
 // NewHTTPService returns a service that will run listen and serve the given
 // HTTP server.