verify deploy function to Google Kubernetes Engine and update Doc (#435)

* verify deploy function to Google Kubernetes Engine and update Doc
* bump version

README.md

@@ -206,8 +206,26 @@ But we would suggest you run `kubectl config current-context` to check if the cu
 * Amazon Elastic Kubernetes Service (EKS)
   TODO
 
-* Google Kubernetes Engine (GKET)
-  TODO
+* Google Kubernetes Engine (GKE)
+
+First you should create a Kubernetes cluster in your GKE, then make sure your KUBECONFIG is ready in `~/.kube/config`, if not, you can run following commands,
+
+``` shell
+$ gcloud auth login
+$ gcloud container clusters get-credentials <your cluster> --zone <zone> --project <project>
+```
+
+Then make sure you current context is GKE cluster, you can check it with command,
+
+``` shell
+$ kubectl config current-context
+```
+
+Then you can deploy your function onto GKE cluster with,
+
+```shell
+$ KUBECONFIG=~/.kube/config fx up examples/functions/JavaScript/func.js --name hellojs
+```
 
 * Setup your own Kubernetes cluster
 

fx.go

@@ -14,9 +14,10 @@ import (
 	"github.com/metrue/fx/handlers"
 	"github.com/metrue/fx/middlewares"
 	"github.com/urfave/cli"
+	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
 )
 
-const version = "0.8.82"
+const version = "0.8.84"
 
 func init() {
 	go checkForUpdate()

go.mod

@@ -39,7 +39,7 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.6.1
 	github.com/stretchr/testify v1.4.0
-	github.com/ugorji/go/codec v1.1.7 // indirect
+	github.com/ugorji/go v1.1.7 // indirect
 	github.com/urfave/cli v1.22.2
 	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
 	golang.org/x/crypto v0.0.0-20191219195013-becbf705a915 // indirect

go.sum

@@ -1,5 +1,6 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0 h1:ROfEUZz+Gh5pa62DJWXSaonyu3StP6EA6lPEXPI6mCo=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=

packer/packer.go

@@ -70,7 +70,7 @@ func Pack(output string, input ...string) error {
 					return err
 				}
 
-				if isHandler(path) {
+				if isHandler(path, language) {
 					if err := copy.Copy(input[0], path); err != nil {
 						return err
 					}
@@ -84,7 +84,7 @@ func Pack(output string, input ...string) error {
 		return nil
 	}
 
-	if !hasFxHandleFile(input...) {
+	if !hasFxHandleFile(language, input...) {
 		msg := `it requires a fx handle file when input is not a single file function, e.g.
 fx.go for Golang
 Fx.java for Java

packer/rules.go

@@ -23,12 +23,18 @@ var ExtLangMapping = map[string]string{
 	".pl":   "perl",
 }
 
-func isHandler(name string) bool {
+func isHandler(name string, lang string) bool {
 	basename := filepath.Base(name)
 	nameWithoutExt := strings.TrimSuffix(basename, filepath.Ext(basename))
-	return nameWithoutExt == "fx" ||
-		nameWithoutExt == "Fx" || // Fx is for Java
-		nameWithoutExt == "mod" // mod.rs is for Rust
+	if ExtLangMapping[filepath.Ext(basename)] != lang {
+		return false
+	}
+
+	return (nameWithoutExt == "fx" ||
+		// Fx is for Java
+		nameWithoutExt == "Fx" ||
+		// mod.rs is for Rust)
+		nameWithoutExt == "mod")
 }
 
 func langFromFileName(fileName string) (string, error) {
@@ -44,10 +50,10 @@ func langFromFileName(fileName string) (string, error) {
 	return lang, nil
 }
 
-func hasFxHandleFile(input ...string) bool {
+func hasFxHandleFile(lang string, input ...string) bool {
 	var handleFile string
 	for _, file := range input {
-		if utils.IsRegularFile(file) && isHandler(file) {
+		if utils.IsRegularFile(file) && isHandler(file, lang) {
 			handleFile = file
 			break
 		} else if utils.IsDir(file) {
@@ -56,7 +62,7 @@ func hasFxHandleFile(input ...string) bool {
 					return err
 				}
 
-				if utils.IsRegularFile(path) && isHandler(info.Name()) {
+				if utils.IsRegularFile(path) && isHandler(info.Name(), lang) {
 					handleFile = path
 				}
 				return nil