Split out the Package type into a first class Kubernetes resource (#295)

Split out the Package type into a first class Kubernetes resource. Before this change, packages were implicitly tied to functions.

This wasn't ideal because:
 * Functions will need to share packages
 * A package storage system may be more generally useful than just
   functions (for example, for storing static assets)

This change does the following:
* Updates the fission and tpr types to add a new Package and PackageSpec.  It also creates a PackageRef type, and a FunctionPackageRef type. The PackageRef simply references a package, but the FunctionPackageRef includes the name of a function within the package. This allows us to share packages between different functions.
* Updates fetcher and other components for first-class packages
* Allows customization of fetcher image pull policy in the helm charts

controller/packageApi.go

@@ -0,0 +1,170 @@
+/*
+Copyright 2016 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 (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"k8s.io/client-go/1.5/pkg/api"
+
+	"github.com/fission/fission"
+	"github.com/fission/fission/tpr"
+)
+
+func (a *API) PackageApiList(w http.ResponseWriter, r *http.Request) {
+	funcs, err := a.fissionClient.Packages(api.NamespaceAll).List(api.ListOptions{})
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	resp, err := json.Marshal(funcs.Items)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	a.respondWithSuccess(w, resp)
+}
+
+func (a *API) PackageApiCreate(w http.ResponseWriter, r *http.Request) {
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	var f tpr.Package
+	err = json.Unmarshal(body, &f)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	err = validateResourceName(f.Metadata.Name)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	// Ensure size limits
+	if len(f.Spec.Literal) > 256*1024 {
+		err := fission.MakeError(fission.ErrorInvalidArgument, "Package literal larger than 256K")
+		a.respondWithError(w, err)
+		return
+	}
+
+	fnew, err := a.fissionClient.Packages(f.Metadata.Namespace).Create(&f)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	resp, err := json.Marshal(fnew.Metadata)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	w.WriteHeader(http.StatusCreated)
+	a.respondWithSuccess(w, resp)
+}
+
+func (a *API) PackageApiGet(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	name := vars["package"]
+	ns := vars["namespace"]
+	if len(ns) == 0 {
+		ns = api.NamespaceDefault
+	}
+	raw := r.FormValue("raw") // just the deployment pkg
+
+	f, err := a.fissionClient.Packages(ns).Get(name)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	var resp []byte
+	if raw != "" {
+		resp = []byte(f.Spec.Literal)
+	} else {
+		resp, err = json.Marshal(f)
+		if err != nil {
+			a.respondWithError(w, err)
+			return
+		}
+	}
+	a.respondWithSuccess(w, resp)
+}
+
+func (a *API) PackageApiUpdate(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	name := vars["package"]
+
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	var f tpr.Package
+	err = json.Unmarshal(body, &f)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	if name != f.Metadata.Name {
+		err = fission.MakeError(fission.ErrorInvalidArgument, "Package name doesn't match URL")
+		a.respondWithError(w, err)
+		return
+	}
+
+	fnew, err := a.fissionClient.Packages(f.Metadata.Namespace).Update(&f)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	resp, err := json.Marshal(fnew.Metadata)
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+	a.respondWithSuccess(w, resp)
+}
+
+func (a *API) PackageApiDelete(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	name := vars["package"]
+	ns := vars["namespace"]
+	if len(ns) == 0 {
+		ns = api.NamespaceDefault
+	}
+
+	err := a.fissionClient.Packages(ns).Delete(name, &api.DeleteOptions{})
+	if err != nil {
+		a.respondWithError(w, err)
+		return
+	}
+
+	a.respondWithSuccess(w, []byte(""))
+}