add experimental submodule with grpc server

.github/workflows/test.yaml

@@ -27,3 +27,5 @@ jobs:
             ${{ runner.os }}-go-
       - name: Test
         run: go test ./...
+      - name: Test Experimental SubModule
+        run: cd ./component/x && go test ./... && cd ../..

component/doc.go

@@ -2,45 +2,34 @@
 Package component contains some commonly used implementations
 of long-running components like an HTTP server.
 
-	package component
+	package main
 
 	import (
 		"context"
-		"net"
+		"fmt"
+		"net/http"
+		"os"
+		"os/signal"
 
-		"github.com/gojekfarm/xrun"
-		"google.golang.org/grpc"
+		"github.com/gojekfarm/xrun/component"
 	)
 
-	// GRPCServerOptions holds options for GRPCServer
-	type GRPCServerOptions struct {
-		Server   *grpc.Server
-		Listener net.Listener
-	}
-
-	// GRPCServer is a helper which returns an xrun.ComponentFunc to run a grpc.Server
-	func GRPCServer(opts GRPCServerOptions) xrun.ComponentFunc {
-		srv := opts.Server
-		l := opts.Listener
-
-		return func(ctx context.Context) error {
-			errCh := make(chan error, 1)
-			go func() {
-				if err := srv.Serve(l); err != nil && err != grpc.ErrServerStopped {
-					errCh <- err
-				}
-			}()
-
-			select {
-			case <-ctx.Done():
-			case err := <-errCh:
-
-				return err
-			}
-
-			srv.GracefulStop()
-
-			return nil
+	func main() {
+		c := component.HTTPServer(component.HTTPServerOptions{
+			Server: &http.Server{},
+			PreStart: func() {
+				fmt.Println("starting server")
+			},
+			PreStop: func() {
+				fmt.Println("stopping server")
+			},
+		})
+
+		ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, os.Kill)
+		defer stop()
+
+		if err := c.Run(ctx); err != nil {
+			os.Exit(1)
 		}
 	}
 

component/x/go.mod

@@ -0,0 +1,10 @@
+module github.com/gojekfarm/xrun/component/x
+
+go 1.16
+
+require (
+	github.com/gojekfarm/xrun v0.2.0
+	github.com/stretchr/testify v1.7.0
+	golang.org/x/net v0.0.0-20210510120150-4163338589ed
+	google.golang.org/grpc v1.37.1
+)

component/x/go.sum

@@ -0,0 +1,100 @@
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component/x/grpc/server.go

@@ -0,0 +1,59 @@
+package grpc
+
+import (
+	"context"
+	"net"
+
+	"github.com/gojekfarm/xrun"
+	"google.golang.org/grpc"
+)
+
+// Options holds options for Server
+type Options struct {
+	Server   *grpc.Server
+	Listener net.Listener
+	PreStart func()
+	PreStop  func()
+	PostStop func()
+}
+
+// Server is a helper which returns a xrun.ComponentFunc to start a grpc.Server
+func Server(opts Options) xrun.ComponentFunc {
+	srv := opts.Server
+	l := opts.Listener
+	ps := opts.PreStart
+	pst := opts.PreStop
+	pstp := opts.PostStop
+
+	return func(ctx context.Context) error {
+		errCh := make(chan error, 1)
+
+		go func(errCh chan error) {
+			if ps != nil {
+				ps()
+			}
+
+			if err := srv.Serve(l); err != nil && err != grpc.ErrServerStopped {
+				errCh <- err
+			}
+		}(errCh)
+
+		select {
+		case <-ctx.Done():
+		case err := <-errCh:
+			return err
+		}
+
+		if pst != nil {
+			pst()
+		}
+
+		srv.GracefulStop()
+
+		if pstp != nil {
+			pstp()
+		}
+
+		return nil
+	}
+}

component/x/grpc/server_test.go

@@ -0,0 +1,121 @@
+package grpc
+
+import (
+	"context"
+	"errors"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/gojekfarm/xrun"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+	"golang.org/x/net/nettest"
+	"google.golang.org/grpc"
+)
+
+type ServerTestSuite struct {
+	suite.Suite
+}
+
+func TestServerSuite(t *testing.T) {
+	suite.Run(t, new(ServerTestSuite))
+}
+
+func (s *ServerTestSuite) TestServer() {
+	testcases := []struct {
+		name                string
+		wantErr             bool
+		wantBadListener     bool
+		wantShutdownTimeout bool
+	}{
+		{
+			name: "SuccessfulStart",
+		},
+		{
+			name:            "BadListener",
+			wantBadListener: true,
+			wantErr:         true,
+		},
+		{
+			name:                "GracefulShutdownError",
+			wantShutdownTimeout: true,
+			wantErr:             true,
+		},
+	}
+
+	for _, t := range testcases {
+		s.Run(t.name, func() {
+			var opts []xrun.Option
+			if t.wantShutdownTimeout {
+				opts = append(opts, xrun.WithGracefulShutdownTimeout(time.Nanosecond))
+			}
+			m := xrun.NewManager(opts...)
+			srv := grpc.NewServer()
+
+			var l net.Listener
+			if t.wantBadListener {
+				ml := &mockListener{}
+				ml.On("Accept").Return(nil, errors.New("unknown listen error"))
+				ml.On("Close").Return(nil)
+				l = ml
+				defer func() {
+					ml.AssertExpectations(s.T())
+				}()
+			} else {
+				var err error
+				l, err = nettest.NewLocalListener("tcp")
+				s.NoError(err)
+			}
+
+			s.NoError(m.Add(Server(Options{
+				Server:   srv,
+				Listener: l,
+				PreStart: func() {
+					s.T().Log("PreStart called")
+				},
+				PreStop: func() {
+					s.T().Log("PreStop called")
+				},
+				PostStop: func() {
+					s.T().Log("PostStop called")
+				},
+			})))
+
+			errCh := make(chan error, 1)
+			ctx, cancel := context.WithCancel(context.Background())
+			go func() {
+				errCh <- m.Run(ctx)
+			}()
+
+			time.Sleep(50 * time.Millisecond)
+
+			cancel()
+			if t.wantErr {
+				s.Error(<-errCh)
+			} else {
+				s.NoError(<-errCh)
+			}
+		})
+	}
+}
+
+type mockListener struct {
+	mock.Mock
+}
+
+func (m *mockListener) Accept() (net.Conn, error) {
+	args := m.Called()
+	if err := args.Error(1); err != nil {
+		return nil, err
+	}
+	return args.Get(0).(net.Conn), nil
+}
+
+func (m *mockListener) Close() error {
+	return m.Called().Error(0)
+}
+
+func (m *mockListener) Addr() net.Addr {
+	return m.Called().Get(0).(net.Addr)
+}