[FAB-4352] Add version cmd to configtxlator

Adds a version cmd to configtxlator.
Modified configxtxlator to use kingpin
as the CLI library as that's what is
used in cryptogen as well.

Version info is added to the binary
using both
make configtxlator
make release[-all]

(Note: this fixes the issue with
make cryptogen not adding the version
as well)

Change-Id: I6bc52f12a09b4ea60dcab2693205cf151fb1b681
Signed-off-by: Gari Singh <[email protected]>

Author: mastersingh24

Makefile

@@ -129,10 +129,13 @@ orderer-docker: build/image/orderer/$(DUMMY)
 
 .PHONY: configtxgen
 configtxgen: GO_TAGS+= nopkcs11
+configtxgen: GO_LDFLAGS=-X $(pkgmap.$(@F))/metadata.Version=$(PROJECT_VERSION)
 configtxgen: build/bin/configtxgen
 
+configtxlator: GO_LDFLAGS=-X $(pkgmap.$(@F))/metadata.Version=$(PROJECT_VERSION)
 configtxlator: build/bin/configtxlator
 
+cryptogen: GO_LDFLAGS=-X $(pkgmap.$(@F))/metadata.Version=$(PROJECT_VERSION)
 cryptogen: build/bin/cryptogen
 
 tools-docker: build/image/tools/$(DUMMY)

common/tools/configtxlator/main.go

@@ -17,25 +17,50 @@ limitations under the License.
 package main
 
 import (
-	"flag"
 	"fmt"
 	"net/http"
+	"os"
 
+	"github.com/hyperledger/fabric/common/tools/configtxlator/metadata"
 	"github.com/hyperledger/fabric/common/tools/configtxlator/rest"
-
 	"github.com/op/go-logging"
+	"gopkg.in/alecthomas/kingpin.v2"
 )
 
 var logger = logging.MustGetLogger("configtxlator")
 
+// command line flags
+var (
+	app = kingpin.New("configtxlator", "Utility for generating Hyperledger Fabric channel configurations")
+
+	start    = app.Command("start", "Start the configtxlator REST server")
+	hostname = start.Flag("hostname", "The hostname or IP on which the REST server will listen").Default("0.0.0.0").String()
+	port     = start.Flag("port", "The port on which the REST server will listen").Default("7059").Int()
+
+	version = app.Command("version", "Show version information")
+)
+
 func main() {
-	var serverPort int
+	kingpin.Version("0.0.1")
+	switch kingpin.MustParse(app.Parse(os.Args[1:])) {
+	// "start" command
+	case start.FullCommand():
+		startServer(fmt.Sprintf("%s:%d", *hostname, *port))
 
-	flag.IntVar(&serverPort, "serverPort", 7059, "Specify the port for the REST server to listen on.")
-	flag.Parse()
+	// "version" command
+	case version.FullCommand():
+		printVersion()
+	}
 
-	logger.Infof("Serving HTTP requests on port: %d", serverPort)
-	err := http.ListenAndServe(fmt.Sprintf(":%d", serverPort), rest.NewRouter())
+}
+
+func startServer(address string) {
+	logger.Infof("Serving HTTP requests on %s", address)
+	err := http.ListenAndServe(address, rest.NewRouter())
+
+	app.Fatalf("Error starting server:[%s]\n", err)
+}
 
-	logger.Fatal("Error runing http server:", err)
+func printVersion() {
+	fmt.Println(metadata.GetVersionInfo())
 }

common/tools/configtxlator/metadata/metadata.go

@@ -0,0 +1,32 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package metadata
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// package-scoped variables
+
+// Package version
+var Version string
+
+// package-scoped constants
+
+// Program name
+const ProgramName = "configtxlator"
+
+func GetVersionInfo() string {
+	if Version == "" {
+		Version = "development build"
+	}
+
+	return fmt.Sprintf("%s:\n Version: %s\n Go version: %s\n OS/Arch: %s",
+		ProgramName, Version, runtime.Version(),
+		fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH))
+}

common/tools/configtxlator/metadata/metadata_test.go

@@ -0,0 +1,26 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package metadata_test
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+
+	"github.com/hyperledger/fabric/common/tools/cryptogen/metadata"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetVersionInfo(t *testing.T) {
+	testVersion := "TestVersion"
+	metadata.Version = testVersion
+
+	expected := fmt.Sprintf("%s:\n Version: %s\n Go version: %s\n OS/Arch: %s",
+		metadata.ProgramName, testVersion, runtime.Version(),
+		fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH))
+	assert.Equal(t, expected, metadata.GetVersionInfo())
+}