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314 lines
8.3 KiB
314 lines
8.3 KiB
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"errors"
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"io"
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"path"
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"strconv"
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"strings"
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)
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type networkStorage struct {
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netScheme string
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netAddr string
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netPath string
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rpcClient *RPCClient
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rpcToken string
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}
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const (
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storageRPCPath = reservedBucket + "/storage"
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)
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// splits network path into its components Address and Path.
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func splitNetPath(networkPath string) (netAddr, netPath string) {
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index := strings.LastIndex(networkPath, ":")
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netAddr = networkPath[:index]
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netPath = networkPath[index+1:]
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return netAddr, netPath
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}
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// Converts rpc.ServerError to underlying error. This function is
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// written so that the storageAPI errors are consistent across network
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// disks as well.
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func toStorageErr(err error) error {
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if err == nil {
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return nil
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}
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switch err.Error() {
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case io.EOF.Error():
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return io.EOF
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case io.ErrUnexpectedEOF.Error():
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return io.ErrUnexpectedEOF
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case errUnexpected.Error():
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return errUnexpected
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case errDiskFull.Error():
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return errDiskFull
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case errVolumeNotFound.Error():
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return errVolumeNotFound
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case errVolumeExists.Error():
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return errVolumeExists
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case errFileNotFound.Error():
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return errFileNotFound
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case errFileNameTooLong.Error():
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return errFileNameTooLong
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case errFileAccessDenied.Error():
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return errFileAccessDenied
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case errIsNotRegular.Error():
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return errIsNotRegular
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case errVolumeNotEmpty.Error():
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return errVolumeNotEmpty
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case errVolumeAccessDenied.Error():
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return errVolumeAccessDenied
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case errCorruptedFormat.Error():
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return errCorruptedFormat
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case errUnformattedDisk.Error():
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return errUnformattedDisk
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}
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return err
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}
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// Login rpc client makes an authentication request to the rpc server.
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// Receives a session token which will be used for subsequent requests.
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// FIXME: Currently these tokens expire in 100yrs.
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func loginRPCClient(rpcClient *RPCClient) (tokenStr string, err error) {
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cred := serverConfig.GetCredential()
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reply := RPCLoginReply{}
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if err = rpcClient.Call("Storage.LoginHandler", RPCLoginArgs{
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Username: cred.AccessKeyID,
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Password: cred.SecretAccessKey,
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}, &reply); err != nil {
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return "", err
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}
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if reply.ServerVersion != minioVersion {
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return "", errors.New("Server version mismatch")
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}
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// Reply back server provided token.
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return reply.Token, nil
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}
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// Initialize new rpc client.
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func newRPCClient(networkPath string) (StorageAPI, error) {
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// Input validation.
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if networkPath == "" || strings.LastIndex(networkPath, ":") == -1 {
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return nil, errInvalidArgument
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}
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// TODO validate netAddr and netPath.
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netAddr, netPath := splitNetPath(networkPath)
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// Dial minio rpc storage http path.
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rpcPath := path.Join(storageRPCPath, netPath)
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port := getPort(srvConfig.serverAddr)
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rpcAddr := netAddr + ":" + strconv.Itoa(port)
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// Initialize rpc client with network address and rpc path.
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rpcClient := newClient(rpcAddr, rpcPath)
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token, err := loginRPCClient(rpcClient)
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if err != nil {
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// Close the corresponding network connection w/ server to
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// avoid leaking socket file descriptor.
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rpcClient.Close()
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return nil, err
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}
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// Initialize network storage.
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ndisk := &networkStorage{
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netScheme: "http", // TODO: fix for ssl rpc support.
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netAddr: netAddr,
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netPath: netPath,
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rpcClient: rpcClient,
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rpcToken: token,
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}
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// Returns successfully here.
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return ndisk, nil
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}
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// MakeVol - make a volume.
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func (n networkStorage) MakeVol(volume string) error {
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if n.rpcClient == nil {
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return errVolumeBusy
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}
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reply := GenericReply{}
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args := GenericVolArgs{n.rpcToken, volume}
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if err := n.rpcClient.Call("Storage.MakeVolHandler", args, &reply); err != nil {
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return toStorageErr(err)
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}
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return nil
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}
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// ListVols - List all volumes.
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func (n networkStorage) ListVols() (vols []VolInfo, err error) {
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if n.rpcClient == nil {
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return nil, errVolumeBusy
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}
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ListVols := ListVolsReply{}
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err = n.rpcClient.Call("Storage.ListVolsHandler", n.rpcToken, &ListVols)
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if err != nil {
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return nil, err
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}
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return ListVols.Vols, nil
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}
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// StatVol - get current Stat volume info.
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func (n networkStorage) StatVol(volume string) (volInfo VolInfo, err error) {
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if n.rpcClient == nil {
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return VolInfo{}, errVolumeBusy
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}
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args := GenericVolArgs{n.rpcToken, volume}
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if err = n.rpcClient.Call("Storage.StatVolHandler", args, &volInfo); err != nil {
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return VolInfo{}, toStorageErr(err)
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}
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return volInfo, nil
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}
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// DeleteVol - Delete a volume.
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func (n networkStorage) DeleteVol(volume string) error {
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if n.rpcClient == nil {
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return errVolumeBusy
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}
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reply := GenericReply{}
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args := GenericVolArgs{n.rpcToken, volume}
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if err := n.rpcClient.Call("Storage.DeleteVolHandler", args, &reply); err != nil {
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return toStorageErr(err)
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}
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return nil
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}
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// File operations.
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// CreateFile - create file.
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func (n networkStorage) AppendFile(volume, path string, buffer []byte) (err error) {
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if n.rpcClient == nil {
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return errVolumeBusy
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}
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reply := GenericReply{}
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if err = n.rpcClient.Call("Storage.AppendFileHandler", AppendFileArgs{
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Token: n.rpcToken,
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Vol: volume,
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Path: path,
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Buffer: buffer,
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}, &reply); err != nil {
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return toStorageErr(err)
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}
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return nil
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}
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// StatFile - get latest Stat information for a file at path.
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func (n networkStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
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if n.rpcClient == nil {
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return FileInfo{}, errVolumeBusy
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}
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if err = n.rpcClient.Call("Storage.StatFileHandler", StatFileArgs{
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Token: n.rpcToken,
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Vol: volume,
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Path: path,
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}, &fileInfo); err != nil {
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return FileInfo{}, toStorageErr(err)
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}
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return fileInfo, nil
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}
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// ReadAll - reads entire contents of the file at path until EOF, returns the
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// contents in a byte slice. Returns buf == nil if err != nil.
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// This API is meant to be used on files which have small memory footprint, do
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// not use this on large files as it would cause server to crash.
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func (n networkStorage) ReadAll(volume, path string) (buf []byte, err error) {
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if n.rpcClient == nil {
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return nil, errVolumeBusy
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}
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if err = n.rpcClient.Call("Storage.ReadAllHandler", ReadAllArgs{
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Token: n.rpcToken,
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Vol: volume,
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Path: path,
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}, &buf); err != nil {
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return nil, toStorageErr(err)
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}
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return buf, nil
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}
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// ReadFile - reads a file.
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func (n networkStorage) ReadFile(volume string, path string, offset int64, buffer []byte) (m int64, err error) {
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if n.rpcClient == nil {
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return 0, errVolumeBusy
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}
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var result []byte
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err = n.rpcClient.Call("Storage.ReadFileHandler", ReadFileArgs{
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Token: n.rpcToken,
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Vol: volume,
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Path: path,
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Offset: offset,
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Size: len(buffer),
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}, &result)
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// Copy results to buffer.
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copy(buffer, result)
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// Return length of result, err if any.
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return int64(len(result)), toStorageErr(err)
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}
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// ListDir - list all entries at prefix.
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func (n networkStorage) ListDir(volume, path string) (entries []string, err error) {
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if n.rpcClient == nil {
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return nil, errVolumeBusy
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}
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if err = n.rpcClient.Call("Storage.ListDirHandler", ListDirArgs{
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Token: n.rpcToken,
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Vol: volume,
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Path: path,
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}, &entries); err != nil {
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return nil, toStorageErr(err)
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}
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// Return successfully unmarshalled results.
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return entries, nil
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}
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// DeleteFile - Delete a file at path.
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func (n networkStorage) DeleteFile(volume, path string) (err error) {
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if n.rpcClient == nil {
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return errVolumeBusy
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}
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reply := GenericReply{}
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if err = n.rpcClient.Call("Storage.DeleteFileHandler", DeleteFileArgs{
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Token: n.rpcToken,
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Vol: volume,
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Path: path,
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}, &reply); err != nil {
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return toStorageErr(err)
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}
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return nil
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}
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// RenameFile - Rename file.
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func (n networkStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
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if n.rpcClient == nil {
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return errVolumeBusy
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}
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reply := GenericReply{}
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if err = n.rpcClient.Call("Storage.RenameFileHandler", RenameFileArgs{
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Token: n.rpcToken,
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SrcVol: srcVolume,
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SrcPath: srcPath,
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DstVol: dstVolume,
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DstPath: dstPath,
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}, &reply); err != nil {
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return toStorageErr(err)
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}
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return nil
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}
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