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// Storehouse: HTTP object store server
//
// Licensed under CC0 1.0 Universal:
// https://creativecommons.org/publicdomain/zero/1.0/legalcode
package main
import (
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"github.com/labstack/echo/v4"
"github.com/pablombg/storehouse/objectstore"
)
type storehouse struct {
objects objectstore.ObjectStore
}
func InitStorehouse(memory bool, dataDir string) *storehouse {
var objects objectstore.ObjectStore
if memory {
objects = objectstore.NewMemBackend()
} else {
objects = objectstore.NewFileBackend(dataDir)
}
return &storehouse{objects: objects}
}
func (s *storehouse) putObject(c echo.Context) error {
bucketId := c.Param("bucketId")
objectId := c.Param("objectId")
// Get request body
bodyBytes, err := ioutil.ReadAll(c.Request().Body)
if err != nil {
log.Printf("Error reading body: %v", err)
m := &errorJSON{Error: "Error reading body"}
return c.JSON(http.StatusInternalServerError, m)
}
err = s.objects.CreateObject(bucketId, objectId, bodyBytes)
// Check errors creating the object
if err != nil {
log.Printf("Error creating the object: %v", err)
switch err.(type) {
case *objectstore.DuplicateError:
// Return "409 Conflict" if there
// is a duplicate of the object
m := &errorJSON{Error: err.Error()}
return c.JSON(http.StatusConflict, m)
default:
m := &errorJSON{Error: "Internal error"}
return c.JSON(http.StatusInternalServerError, m)
}
}
// Return success
m := &objectIdJSON{Id: objectId}
return c.JSON(http.StatusCreated, m)
}
func (s *storehouse) getObject(c echo.Context) error {
bucketId := c.Param("bucketId")
objectId := c.Param("objectId")
object, err := s.objects.GetObject(bucketId, objectId)
if errors.Is(err, os.ErrNotExist) {
msg := "Object not found"
log.Println(msg)
m := &errorJSON{Error: msg}
return c.JSON(http.StatusNotFound, m)
} else if err != nil {
log.Println(err)
m := &errorJSON{Error: "Internal error"}
return c.JSON(http.StatusInternalServerError, m)
}
return c.String(http.StatusOK, object)
}
func (s *storehouse) deleteObject(c echo.Context) error {
bucketId := c.Param("bucketId")
objectId := c.Param("objectId")
err := s.objects.DeleteObject(bucketId, objectId)
if errors.Is(err, os.ErrNotExist) {
msg := "Object not found"
log.Println(msg)
m := &errorJSON{Error: msg}
return c.JSON(http.StatusNotFound, m)
} else if err != nil {
log.Println(err)
m := &errorJSON{Error: "Internal error"}
return c.JSON(http.StatusInternalServerError, m)
}
m := &infoJSON{Info: "Object deleted"}
return c.JSON(http.StatusOK, m)
}
func main() {
// Command-line options
memHelp := "Memory backend with de-duplication (default: file backend w/o de-dup)"
memory := flag.Bool("memory", false, memHelp)
dataDirHelp := "The directory where the objects are stored with the file backend"
dataDir := flag.String("datadir", "data", dataDirHelp)
portHelp := "The port on which the server will listen for connections"
port := flag.Int("port", 8080, portHelp)
flag.Parse()
// Initialization
s := InitStorehouse(*memory, *dataDir)
e := echo.New()
// Routes
e.GET("/objects/:bucketId/:objectId", s.getObject)
e.PUT("/objects/:bucketId/:objectId", s.putObject)
e.DELETE("/objects/:bucketId/:objectId", s.deleteObject)
// Start server
listenConf := fmt.Sprintf(":%v", *port)
e.Start(listenConf)
}
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