minio/cmd/storage-rpc-server.go
2017-04-11 15:44:27 -07:00

239 lines
6.4 KiB
Go

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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 cmd
import (
"io"
"net/rpc"
"path"
"time"
router "github.com/gorilla/mux"
"github.com/minio/minio/pkg/disk"
)
// Storage server implements rpc primitives to facilitate exporting a
// disk over a network.
type storageServer struct {
AuthRPCServer
storage StorageAPI
path string
timestamp time.Time
}
/// Storage operations handlers.
// DiskInfoHandler - disk info handler is rpc wrapper for DiskInfo operation.
func (s *storageServer) DiskInfoHandler(args *AuthRPCArgs, reply *disk.Info) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
info, err := s.storage.DiskInfo()
*reply = info
return err
}
/// Volume operations handlers.
// MakeVolHandler - make vol handler is rpc wrapper for MakeVol operation.
func (s *storageServer) MakeVolHandler(args *GenericVolArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
return s.storage.MakeVol(args.Vol)
}
// ListVolsHandler - list vols handler is rpc wrapper for ListVols operation.
func (s *storageServer) ListVolsHandler(args *AuthRPCArgs, reply *ListVolsReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
vols, err := s.storage.ListVols()
if err != nil {
return err
}
reply.Vols = vols
return nil
}
// StatVolHandler - stat vol handler is a rpc wrapper for StatVol operation.
func (s *storageServer) StatVolHandler(args *GenericVolArgs, reply *VolInfo) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
volInfo, err := s.storage.StatVol(args.Vol)
if err != nil {
return err
}
*reply = volInfo
return nil
}
// DeleteVolHandler - delete vol handler is a rpc wrapper for
// DeleteVol operation.
func (s *storageServer) DeleteVolHandler(args *GenericVolArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
return s.storage.DeleteVol(args.Vol)
}
/// File operations
// StatFileHandler - stat file handler is rpc wrapper to stat file.
func (s *storageServer) StatFileHandler(args *StatFileArgs, reply *FileInfo) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
fileInfo, err := s.storage.StatFile(args.Vol, args.Path)
if err != nil {
return err
}
*reply = fileInfo
return nil
}
// ListDirHandler - list directory handler is rpc wrapper to list dir.
func (s *storageServer) ListDirHandler(args *ListDirArgs, reply *[]string) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
entries, err := s.storage.ListDir(args.Vol, args.Path)
if err != nil {
return err
}
*reply = entries
return nil
}
// ReadAllHandler - read all handler is rpc wrapper to read all storage API.
func (s *storageServer) ReadAllHandler(args *ReadFileArgs, reply *[]byte) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
buf, err := s.storage.ReadAll(args.Vol, args.Path)
if err != nil {
return err
}
*reply = buf
return nil
}
// ReadFileHandler - read file handler is rpc wrapper to read file.
func (s *storageServer) ReadFileHandler(args *ReadFileArgs, reply *[]byte) (err error) {
if err = args.IsAuthenticated(); err != nil {
return err
}
var n int64
n, err = s.storage.ReadFile(args.Vol, args.Path, args.Offset, args.Buffer)
// Sending an error over the rpc layer, would cause unmarshalling to fail. In situations
// when we have short read i.e `io.ErrUnexpectedEOF` treat it as good condition and copy
// the buffer properly.
if err == io.ErrUnexpectedEOF {
// Reset to nil as good condition.
err = nil
}
*reply = args.Buffer[0:n]
return err
}
// PrepareFileHandler - prepare file handler is rpc wrapper to prepare file.
func (s *storageServer) PrepareFileHandler(args *PrepareFileArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
return s.storage.PrepareFile(args.Vol, args.Path, args.Size)
}
// AppendFileHandler - append file handler is rpc wrapper to append file.
func (s *storageServer) AppendFileHandler(args *AppendFileArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
return s.storage.AppendFile(args.Vol, args.Path, args.Buffer)
}
// DeleteFileHandler - delete file handler is rpc wrapper to delete file.
func (s *storageServer) DeleteFileHandler(args *DeleteFileArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
return s.storage.DeleteFile(args.Vol, args.Path)
}
// RenameFileHandler - rename file handler is rpc wrapper to rename file.
func (s *storageServer) RenameFileHandler(args *RenameFileArgs, reply *AuthRPCReply) error {
if err := args.IsAuthenticated(); err != nil {
return err
}
return s.storage.RenameFile(args.SrcVol, args.SrcPath, args.DstVol, args.DstPath)
}
// Initialize new storage rpc.
func newRPCServer(endpoints EndpointList) (servers []*storageServer, err error) {
for _, endpoint := range endpoints {
if endpoint.IsLocal {
storage, err := newPosix(endpoint.Path)
if err != nil && err != errDiskNotFound {
return nil, err
}
servers = append(servers, &storageServer{
storage: storage,
path: endpoint.Path,
})
}
}
return servers, nil
}
// registerStorageRPCRouter - register storage rpc router.
func registerStorageRPCRouters(mux *router.Router, endpoints EndpointList) error {
// Initialize storage rpc servers for every disk that is hosted on this node.
storageRPCs, err := newRPCServer(endpoints)
if err != nil {
return traceError(err)
}
// Create a unique route for each disk exported from this node.
for _, stServer := range storageRPCs {
storageRPCServer := rpc.NewServer()
err = storageRPCServer.RegisterName("Storage", stServer)
if err != nil {
return traceError(err)
}
// Add minio storage routes.
storageRouter := mux.PathPrefix(minioReservedBucketPath).Subrouter()
storageRouter.Path(path.Join(storageRPCPath, stServer.path)).Handler(storageRPCServer)
}
return nil
}