Enable go module support for go environment (#1152)

examples/go/module-example/README.md

@@ -0,0 +1,35 @@
+# Go module usage
+
+1. Initialize your project
+
+```bash
+$ go mod init "<module>"
+```
+
+For example,
+
+```bash
+$ go mod init "github.com/fission/fission/examples/go/go-module-example"
+```
+
+2. Add dependencies
+
+ * See [here](https://github.com/golang/go/wiki/Modules#daily-workflow)
+
+3. Verify
+
+```bash
+$ go mod verify
+```
+
+4. Archive and create package as usual
+
+```bash
+$ zip -r go.zip .
+    adding: go.mod (deflated 26%)
+    adding: go.sum (deflated 1%)
+    adding: README.md (deflated 37%)
+    adding: main.go (deflated 30%)
+    
+$ fission pkg create --env go --src go.zip
+```

examples/go/module-example/go.mod

@@ -0,0 +1,3 @@
+module github.com/fission/fission/examples/go/go-module-example
+
+require github.com/golang/example v0.0.0-20170904185048-46695d81d1fa

examples/go/module-example/go.sum

@@ -0,0 +1 @@
+github.com/golang/example v0.0.0-20170904185048-46695d81d1fa/go.mod h1:tO/5UvQ/uKigUjQBPqzstj6uxd3fUIjddi19DxGJeWg=

examples/go/module-example/main.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/golang/example/stringutil"
+)
+
+// Handler is the entry point for this fission function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	msg := stringutil.Reverse(stringutil.Reverse("Vendor Example Test"))
+	w.Write([]byte(msg))
+}