server: Move all the top level files into cmd folder. (#2490)

This change brings a change which was done for the 'mc'
package to allow for clean repo and have a cleaner
github drop in experience.

cmd/rpc-server.go

@@ -0,0 +1,132 @@
+package cmd
+
+import (
+	"net/rpc"
+
+	router "github.com/gorilla/mux"
+)
+
+// Storage server implements rpc primitives to facilitate exporting a
+// disk over a network.
+type storageServer struct {
+	storage StorageAPI
+}
+
+/// Volume operations handlers
+
+// MakeVolHandler - make vol handler is rpc wrapper for MakeVol operation.
+func (s *storageServer) MakeVolHandler(arg *string, reply *GenericReply) error {
+	err := s.storage.MakeVol(*arg)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// ListVolsHandler - list vols handler is rpc wrapper for ListVols operation.
+func (s *storageServer) ListVolsHandler(arg *string, reply *ListVolsReply) error {
+	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(arg *string, reply *VolInfo) error {
+	volInfo, err := s.storage.StatVol(*arg)
+	if err != nil {
+		return err
+	}
+	*reply = volInfo
+	return nil
+}
+
+// DeleteVolHandler - delete vol handler is a rpc wrapper for
+// DeleteVol operation.
+func (s *storageServer) DeleteVolHandler(arg *string, reply *GenericReply) error {
+	err := s.storage.DeleteVol(*arg)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+/// File operations
+
+// StatFileHandler - stat file handler is rpc wrapper to stat file.
+func (s *storageServer) StatFileHandler(arg *StatFileArgs, reply *FileInfo) error {
+	fileInfo, err := s.storage.StatFile(arg.Vol, arg.Path)
+	if err != nil {
+		return err
+	}
+	*reply = fileInfo
+	return nil
+}
+
+// ListDirHandler - list directory handler is rpc wrapper to list dir.
+func (s *storageServer) ListDirHandler(arg *ListDirArgs, reply *[]string) error {
+	entries, err := s.storage.ListDir(arg.Vol, arg.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(arg *ReadFileArgs, reply *[]byte) error {
+	buf, err := s.storage.ReadAll(arg.Vol, arg.Path)
+	if err != nil {
+		return err
+	}
+	reply = &buf
+	return nil
+}
+
+// ReadFileHandler - read file handler is rpc wrapper to read file.
+func (s *storageServer) ReadFileHandler(arg *ReadFileArgs, reply *int64) error {
+	n, err := s.storage.ReadFile(arg.Vol, arg.Path, arg.Offset, arg.Buffer)
+	if err != nil {
+		return err
+	}
+	reply = &n
+	return nil
+}
+
+// AppendFileHandler - append file handler is rpc wrapper to append file.
+func (s *storageServer) AppendFileHandler(arg *AppendFileArgs, reply *GenericReply) error {
+	return s.storage.AppendFile(arg.Vol, arg.Path, arg.Buffer)
+}
+
+// DeleteFileHandler - delete file handler is rpc wrapper to delete file.
+func (s *storageServer) DeleteFileHandler(arg *DeleteFileArgs, reply *GenericReply) error {
+	return s.storage.DeleteFile(arg.Vol, arg.Path)
+}
+
+// RenameFileHandler - rename file handler is rpc wrapper to rename file.
+func (s *storageServer) RenameFileHandler(arg *RenameFileArgs, reply *GenericReply) error {
+	return s.storage.RenameFile(arg.SrcVol, arg.SrcPath, arg.DstVol, arg.DstPath)
+}
+
+// Initialize new storage rpc.
+func newRPCServer(exportPath string) (*storageServer, error) {
+	// Initialize posix storage API.
+	storage, err := newPosix(exportPath)
+	if err != nil && err != errDiskNotFound {
+		return nil, err
+	}
+	return &storageServer{
+		storage: storage,
+	}, nil
+}
+
+// registerStorageRPCRouter - register storage rpc router.
+func registerStorageRPCRouter(mux *router.Router, stServer *storageServer) {
+	storageRPCServer := rpc.NewServer()
+	storageRPCServer.RegisterName("Storage", stServer)
+	storageRouter := mux.NewRoute().PathPrefix(reservedBucket).Subrouter()
+	// Add minio storage routes.
+	storageRouter.Path("/storage").Handler(storageRPCServer)
+}