Large functions: API proxy for storage svc, upload support in the CLI (#304)

This change contains CLI support for uploading large functions to the storage service.

It also adds a reverse proxy into the storage service to the fission API.

The helm chart is not yet updated to actually run the storage service -- that will come in the next change.

controller/storagesvc.go

@@ -0,0 +1,38 @@
+/*
+Copyright 2017 The Fission Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+)
+
+func (api *API) StorageServiceProxy(w http.ResponseWriter, r *http.Request) {
+	u := api.storageServiceUrl + "/v1/archive"
+	ssUrl, err := url.Parse(u)
+	if err != nil {
+		msg := fmt.Sprintf("Error parsing url %v: %v", u, err)
+		log.Println(msg)
+		http.Error(w, msg, 500)
+		return
+	}
+	proxy := httputil.NewSingleHostReverseProxy(ssUrl)
+	proxy.ServeHTTP(w, r)
+}