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resource_handler.go
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/
resource_handler.go
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// Copyright 2018 Tharanga Nilupul Thennakoon
//
// 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 httphandler
import (
"encoding/json"
"fmt"
"net/http"
"quebic-faas/common"
"quebic-faas/quebic-faas-mgr/dao"
"quebic-faas/types"
"sort"
"strings"
bolt "github.com/coreos/bbolt"
"github.com/gorilla/mux"
)
//ResourceHandler handler
func (httphandler *Httphandler) ResourceHandler(router *mux.Router) {
db := httphandler.db
appConfig := httphandler.config
deployment := httphandler.deployment
router.HandleFunc("/routes", func(w http.ResponseWriter, r *http.Request) {
qID := r.FormValue("id")
if qID == "" {
getAllResources(w, r, db, &types.Resource{})
return
}
resource := &types.Resource{}
resource.ID = qID
getByID(w, r, db, resource)
}).Methods("GET")
router.HandleFunc("/routes/{name}", func(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
routeName := params["name"]
found := false
var route *types.Resource
_ = dao.GetAll(db, &types.Resource{}, func(k, v []byte) error {
route = &types.Resource{}
json.Unmarshal(v, route)
if routeName == route.Name {
found = true
return fmt.Errorf("break loop")
}
return nil
})
if !found {
makeErrorResponse(w, http.StatusNotFound, fmt.Errorf("resource not found"))
return
}
writeResponse(w, route, 200)
}).Methods("GET")
router.HandleFunc("/routes", func(w http.ResponseWriter, r *http.Request) {
resource := &types.Resource{}
err := processRequest(r, resource)
if err != nil {
makeErrorResponse(w, http.StatusBadRequest, err)
return
}
trimStringFieldsResource(resource)
err = preProcessResource(resource)
if err != nil {
makeErrorResponse(w, http.StatusInternalServerError, err)
return
}
errors := validationRoute(db, resource, false, true)
if errors != nil {
status := http.StatusBadRequest
writeResponse(w, types.ErrorResponse{Cause: common.ErrorValidationFailed, Message: errors, Status: status}, status)
return
}
add(w, r, db, resource)
restartAPIGateway(appConfig, deployment)
}).Methods("POST")
router.HandleFunc("/routes", func(w http.ResponseWriter, r *http.Request) {
resource := &types.Resource{}
err := processRequest(r, resource)
if err != nil {
makeErrorResponse(w, http.StatusBadRequest, err)
return
}
trimStringFieldsResource(resource)
err = preProcessResource(resource)
if err != nil {
makeErrorResponse(w, http.StatusInternalServerError, err)
return
}
errors := validationRoute(db, resource, false, false)
if errors != nil {
status := http.StatusBadRequest
writeResponse(w, types.ErrorResponse{Cause: common.ErrorValidationFailed, Message: errors, Status: status}, status)
return
}
update(w, r, db, resource)
restartAPIGateway(appConfig, deployment)
}).Methods("PUT")
}
func getAllResources(w http.ResponseWriter, r *http.Request, db *bolt.DB, entity types.Entity) {
var resources []types.Resource
err := dao.GetAll(db, entity, func(k, v []byte) error {
resource := types.Resource{}
json.Unmarshal(v, &resource)
resources = append(resources, resource)
return nil
})
if err != nil {
makeErrorResponse(w, http.StatusInternalServerError, err)
return
}
if resources == nil {
var emptyStr [0]string
writeResponse(w, emptyStr, http.StatusOK)
} else {
doSort(r, resources)
writeResponse(w, resources, http.StatusOK)
}
}
func trimStringFieldsResource(resource *types.Resource) {
resource.Name = Trim(resource.Name)
resource.URL = Trim(resource.URL)
resource.RequestMethod = Trim(resource.RequestMethod)
}
func validationRoute(db *bolt.DB, resource *types.Resource, isFounctionInvokeRoute bool, isCreate bool) []string {
var errors []string
if resource.Name == "" {
errors = append(errors, "name field should not be empty")
}
if strings.Contains(resource.Name, " ") {
errors = append(errors, "name field not allow to contain spaces")
}
if resource.URL == "" {
errors = append(errors, "url field should not be empty")
}
if strings.Contains(resource.URL, " ") {
errors = append(errors, "url field not allow to contain spaces")
}
if resource.RequestMethod == "" {
errors = append(errors, "requestMethod field should not be empty")
}
if resource.RequestMethod != "" {
if !(resource.RequestMethod == common.ResourceRequestMethodGET ||
resource.RequestMethod == common.ResourceRequestMethodPOST ||
resource.RequestMethod == common.ResourceRequestMethodPUT ||
resource.RequestMethod == common.ResourceRequestMethodDELETE) {
errors = append(errors, "requestMethod is not match to any of thses methods ( GET , POST , PUT , DELETE )")
}
}
if resource.Event == "" {
errors = append(errors, "event field should not be empty")
}
if resource.Event != "" {
//event is saved only for user defined route. function invokers no need to save
if !isFounctionInvokeRoute {
event, eventErrors := createEventFromEventID(db, resource.Event)
if eventErrors != nil {
errors = append(errors, eventErrors...)
} else {
resource.Event = event.GetID()
}
}
}
prepareResourceID(resource)
if !isFounctionInvokeRoute {
if isCreate {
if checkRouteISAlreadyExists(db, resource) {
errors = append(errors, "route is already exists")
}
} else {
if !checkRouteISAlreadyExists(db, resource) {
errors = append(errors, "route is not found")
}
}
}
return errors
}
func checkRouteISAlreadyExists(db *bolt.DB, resource *types.Resource) bool {
found := false
_ = dao.GetByID(db, resource, func(savedObj []byte) error {
if savedObj != nil {
found = true
}
return nil
})
return found
}
func preProcessResource(resource *types.Resource) error {
if !strings.HasPrefix(resource.URL, "/") {
resource.URL = "/" + resource.URL
}
if strings.HasSuffix(resource.URL, "/") {
slashLastIndex := strings.LastIndex(resource.URL, "/")
resource.URL = resource.URL[0:slashLastIndex]
}
return nil
}
func prepareResourceID(resource *types.Resource) {
resource.ID = resource.URL + common.ResourceJOIN + resource.RequestMethod
}
// By is the type of a "less" function that defines the ordering of its Planet arguments.
type By func(r1, r2 *types.Resource) bool
type routesSorter struct {
routes []types.Resource
by func(r1, r2 *types.Resource) bool // Closure used in the Less method.
}
// Len is part of sort.Interface.
func (s *routesSorter) Len() int {
return len(s.routes)
}
// Swap is part of sort.Interface.
func (s *routesSorter) Swap(i, j int) {
s.routes[i], s.routes[j] = s.routes[j], s.routes[i]
}
// Less is part of sort.Interface. It is implemented by calling the "by" closure in the sorter.
func (s *routesSorter) Less(i, j int) bool {
return s.by(&s.routes[i], &s.routes[j])
}
// Sort is a method on the function type, By, that sorts the argument slice according to the function.
func (by By) Sort(routes []types.Resource) {
rs := &routesSorter{
routes: routes,
by: by, // The Sort method's receiver is the function (closure) that defines the sort order.
}
sort.Sort(rs)
}
func doSort(r *http.Request, resources []types.Resource) {
const fieldID = "id"
const fieldModifiedDate = "modifiedDate"
const fieldURL = "url"
sortField := r.FormValue("sortBy")
var sort func(r1, r2 *types.Resource) bool
if sortField == fieldModifiedDate {
sort = func(r1, r2 *types.Resource) bool {
return r1.ModifiedAt < r2.ModifiedAt
}
} else if sortField == fieldURL {
sort = func(r1, r2 *types.Resource) bool {
return r1.URL < r2.URL
}
} else {
sort = func(r1, r2 *types.Resource) bool {
return r1.ID < r2.ID
}
}
By(sort).Sort(resources)
}