HTTP API for Functions

So far, just Function create/read/update/delete/list.  FunctionApi
glues HTTP request/response to functionStore.

controller/api.go

@@ -0,0 +1,102 @@
+/*
+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 (
+	"fmt"
+	"net/http"
+	"os"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/gorilla/handlers"
+	"github.com/gorilla/mux"
+
+	"github.com/platform9/fission"
+)
+
+type API struct {
+	FunctionStore
+	HTTPTriggerStore
+	EnvironmentStore
+}
+
+func (api *API) respondWithSuccess(w http.ResponseWriter, resp []byte) {
+	_, err := w.Write(resp)
+	if err != nil {
+		// this will probably fail too, but try anyway
+		api.respondWithError(w, err)
+	}
+}
+
+func (api *API) respondWithError(w http.ResponseWriter, err error) {
+	var code int
+	var msg string
+
+	fe, ok := err.(fission.Error)
+	if ok {
+		msg = fe.Message
+		switch fe.Code {
+		case fission.ErrorNotFound:
+			code = 404
+		case fission.ErrorInvalidArgument:
+			code = 400
+		case fission.ErrorNoSpace:
+			code = 500
+		case fission.ErrorNotAuthorized:
+			code = 403
+		default:
+			code = 500
+		}
+	} else {
+		code = 500
+		msg = err.Error()
+	}
+	log.Printf("Error: %v: %v", code, msg)
+	http.Error(w, msg, code)
+}
+
+func (api *API) HomeHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "Fission API")
+}
+
+func (api *API) serve(port int) {
+	r := mux.NewRouter()
+	r.HandleFunc("/", api.HomeHandler)
+
+	r.HandleFunc("/functions", api.FunctionApiList).Methods("GET")
+	r.HandleFunc("/functions", api.FunctionApiCreate).Methods("POST")
+	r.HandleFunc("/functions/{function}", api.FunctionApiGet).Methods("GET")
+	r.HandleFunc("/functions/{function}", api.FunctionApiUpdate).Methods("PUT")
+	r.HandleFunc("/functions/{function}", api.FunctionApiDelete).Methods("DELETE")
+
+	// r.HandleFunc("/triggers/http", api.HTTPTriggerApiList).Methods("GET")
+	// r.HandleFunc("/triggers/http", api.HTTPTriggerApiCreate).Methods("POST")
+	// r.HandleFunc("/triggers/http/{httpTrigger}", api.HTTPTriggerApiGet).Methods("GET")
+	// r.HandleFunc("/triggers/http/{httpTrigger}", api.HTTPTriggerApiUpdate).Methods("PUT")
+	// r.HandleFunc("/triggers/http/{httpTrigger}", api.HTTPTriggerApiDelete).Methods("DELETE")
+
+	// r.HandleFunc("/environments", api.EnvironmentApiList).Methods("GET")
+	// r.HandleFunc("/environments", api.EnvironmentApiCreate).Methods("POST")
+	// r.HandleFunc("/environments/{environment}", api.EnvironmentApiGet).Methods("GET")
+	// r.HandleFunc("/environments/{environment}", api.EnvironmentApiUpdate).Methods("PUT")
+	// r.HandleFunc("/environments/{environment}", api.EnvironmentApiDelete).Methods("DELETE")
+
+	address := fmt.Sprintf(":%v", port)
+
+	log.WithFields(log.Fields{"port": port}).Info("Server started")
+	log.Fatal(http.ListenAndServe(address, handlers.LoggingHandler(os.Stdout, r)))
+}

controller/functionApi.go

@@ -0,0 +1,151 @@
+/*
+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 (
+	"io/ioutil"
+	"net/http"
+
+	"encoding/json"
+	log "github.com/Sirupsen/logrus"
+	"github.com/gorilla/mux"
+
+	"github.com/platform9/fission"
+)
+
+func (api *API) FunctionApiList(w http.ResponseWriter, r *http.Request) {
+	funcs, err := api.FunctionStore.List()
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	resp, err := json.Marshal(funcs)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	api.respondWithSuccess(w, resp)
+}
+
+func (api *API) FunctionApiCreate(w http.ResponseWriter, r *http.Request) {
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		api.respondWithError(w, err)
+	}
+
+	var f fission.Function
+	err = json.Unmarshal(body, &f)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	uid, err := api.FunctionStore.Create(&f)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	m := &fission.Metadata{Name: f.Name, Uid: uid}
+	resp, err := json.Marshal(m)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	api.respondWithSuccess(w, resp)
+}
+
+func (api *API) FunctionApiGet(w http.ResponseWriter, r *http.Request) {
+	var m fission.Metadata
+
+	vars := mux.Vars(r)
+	m.Name = vars["function"]
+	m.Uid = r.FormValue("uid") // empty if uid is absent
+
+	f, err := api.FunctionStore.Get(&m)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	resp, err := json.Marshal(f)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	api.respondWithSuccess(w, resp)
+}
+
+func (api *API) FunctionApiUpdate(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	funcName := vars["function"]
+
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		api.respondWithError(w, err)
+	}
+
+	var f fission.Function
+	err = json.Unmarshal(body, &f)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	if funcName != f.Metadata.Name {
+		err = fission.MakeError(fission.ErrorInvalidArgument, "Function name doesn't match URL")
+		api.respondWithError(w, err)
+		return
+	}
+
+	uid, err := api.FunctionStore.Update(&f)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	m := &fission.Metadata{Name: f.Name, Uid: uid}
+	resp, err := json.Marshal(m)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+	api.respondWithSuccess(w, resp)
+}
+
+func (api *API) FunctionApiDelete(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	var m fission.Metadata
+	m.Name = vars["function"]
+
+	m.Uid = r.FormValue("uid") // empty if uid is absent
+	if len(m.Uid) == 0 {
+		log.WithFields(log.Fields{"function": m.Name}).Info("Deleting all versions")
+	}
+
+	err := api.FunctionStore.Delete(m)
+	if err != nil {
+		api.respondWithError(w, err)
+		return
+	}
+
+	api.respondWithSuccess(w, []byte(""))
+}