/
server.go
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/
server.go
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//
// DISCLAIMER
//
// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package service
import (
"context"
"encoding/json"
"io"
"net/http"
"github.com/julienschmidt/httprouter"
"github.com/arangodb/kube-arangodb/pkg/logging"
"github.com/arangodb/kube-arangodb/pkg/storage/provisioner"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
)
const (
contentTypeJSON = "application/json"
)
// runServer runs a HTTP server serving the given API
func runServer(ctx context.Context, log logging.Logger, addr string, api provisioner.API) error {
mux := httprouter.New()
mux.GET("/nodeinfo", getNodeInfoHandler(api))
mux.POST("/info", getInfoHandler(api))
mux.POST("/prepare", getPrepareHandler(api))
mux.POST("/remove", getRemoveHandler(api))
httpServer := &http.Server{
Addr: addr,
Handler: mux,
}
serverErrors := make(chan error)
go func() {
defer close(serverErrors)
log.Info("Listening on %s", addr)
if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
serverErrors <- errors.WithStack(err)
}
}()
select {
case err := <-serverErrors:
return errors.WithStack(err)
case <-ctx.Done():
// Close server
log.Debug("Closing server...")
httpServer.Close()
return nil
}
}
func getNodeInfoHandler(api provisioner.API) func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
ctx := r.Context()
result, err := api.GetNodeInfo(ctx)
if err != nil {
handleError(w, err)
} else {
sendJSON(w, result)
}
}
}
func getInfoHandler(api provisioner.API) func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
ctx := r.Context()
var input provisioner.Request
if err := parseBody(r, &input); err != nil {
handleError(w, err)
} else {
result, err := api.GetInfo(ctx, input.LocalPath)
if err != nil {
handleError(w, err)
} else {
sendJSON(w, result)
}
}
}
}
func getPrepareHandler(api provisioner.API) func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
ctx := r.Context()
var input provisioner.Request
if err := parseBody(r, &input); err != nil {
handleError(w, err)
} else {
if err := api.Prepare(ctx, input.LocalPath); err != nil {
handleError(w, err)
} else {
sendJSON(w, struct{}{})
}
}
}
}
func getRemoveHandler(api provisioner.API) func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
ctx := r.Context()
var input provisioner.Request
if err := parseBody(r, &input); err != nil {
handleError(w, err)
} else {
if err := api.Remove(ctx, input.LocalPath); err != nil {
handleError(w, err)
} else {
sendJSON(w, struct{}{})
}
}
}
}
// sendJSON encodes given body as JSON and sends it to the given writer with given HTTP status.
func sendJSON(w http.ResponseWriter, body interface{}) error {
w.Header().Set("Content-Type", contentTypeJSON)
w.WriteHeader(http.StatusOK)
if body == nil {
w.Write([]byte("{}"))
} else {
encoder := json.NewEncoder(w)
if err := encoder.Encode(body); err != nil {
return errors.WithStack(err)
}
}
return nil
}
func parseBody(r *http.Request, data interface{}) error {
defer r.Body.Close()
body, err := io.ReadAll(r.Body)
if err != nil {
return errors.WithStack(err)
}
if err := json.Unmarshal(body, data); err != nil {
return errors.Wrapf(provisioner.BadRequestError, "Cannot parse request body: %v", err.Error())
}
return nil
}
func handleError(w http.ResponseWriter, err error) {
if provisioner.IsBadRequest(err) {
writeError(w, http.StatusBadRequest, err.Error())
} else {
writeError(w, http.StatusInternalServerError, err.Error())
}
}
func writeError(w http.ResponseWriter, status int, message string) {
if message == "" {
message = "Unknown error"
}
resp := provisioner.ErrorResponse{Error: message}
b, _ := json.Marshal(resp)
w.Header().Set("Content-Type", contentTypeJSON)
w.WriteHeader(status)
w.Write(b)
}