mirror of
https://github.com/minio/minio
synced 2024-11-05 17:34:01 +00:00
312 lines
8.5 KiB
Go
312 lines
8.5 KiB
Go
/*
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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 cmd
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import (
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"bytes"
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"io"
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"net"
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"net/rpc"
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"net/url"
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"path"
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"strings"
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"github.com/minio/minio/pkg/disk"
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)
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type networkStorage struct {
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networkIOErrCount int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
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rpcClient *AuthRPCClient
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}
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const (
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storageRPCPath = reservedBucket + "/storage"
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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.(type) {
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case *net.OpError:
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return errDiskNotFound
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}
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if err == rpc.ErrShutdown {
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return errDiskNotFound
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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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case errInvalidAccessKeyID.Error():
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return errInvalidAccessKeyID
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case errAuthentication.Error():
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return errAuthentication
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case errServerVersionMismatch.Error():
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return errServerVersionMismatch
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case errServerTimeMismatch.Error():
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return errServerTimeMismatch
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}
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return err
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}
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// Initialize new storage rpc client.
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func newStorageRPC(ep *url.URL) (StorageAPI, error) {
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if ep == nil {
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return nil, errInvalidArgument
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}
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// Dial minio rpc storage http path.
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rpcPath := path.Join(storageRPCPath, getPath(ep))
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rpcAddr := ep.Host
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serverCred := serverConfig.GetCredential()
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accessKey := serverCred.AccessKey
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secretKey := serverCred.SecretKey
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if ep.User != nil {
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accessKey = ep.User.Username()
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if password, ok := ep.User.Password(); ok {
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secretKey = password
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}
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}
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storageAPI := &networkStorage{
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rpcClient: newAuthRPCClient(authConfig{
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accessKey: accessKey,
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secretKey: secretKey,
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serverAddr: rpcAddr,
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serviceEndpoint: rpcPath,
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secureConn: globalIsSSL,
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serviceName: "Storage",
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disableReconnect: true,
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}),
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}
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// Returns successfully here.
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return storageAPI, nil
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}
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// Stringer interface compatible representation of network device.
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func (n *networkStorage) String() string {
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// Remove the storage RPC path prefix, internal paths are meaningless.
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serviceEndpoint := strings.TrimPrefix(n.rpcClient.ServiceEndpoint(), storageRPCPath)
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return n.rpcClient.ServerAddr() + ":" + serviceEndpoint
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}
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// Init - attempts a login to reconnect.
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func (n *networkStorage) Init() error {
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return toStorageErr(n.rpcClient.Login())
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}
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// Closes the underlying RPC connection.
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func (n *networkStorage) Close() error {
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// Close the underlying connection.
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return toStorageErr(n.rpcClient.Close())
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}
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// DiskInfo - fetch disk information for a remote disk.
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func (n *networkStorage) DiskInfo() (info disk.Info, err error) {
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args := AuthRPCArgs{}
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if err = n.rpcClient.Call("Storage.DiskInfoHandler", &args, &info); err != nil {
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return disk.Info{}, toStorageErr(err)
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}
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return info, nil
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}
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// MakeVol - create a volume on a remote disk.
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func (n *networkStorage) MakeVol(volume string) (err error) {
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reply := AuthRPCReply{}
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args := GenericVolArgs{Vol: 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 on a remote disk.
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func (n *networkStorage) ListVols() (vols []VolInfo, err error) {
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ListVols := ListVolsReply{}
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err = n.rpcClient.Call("Storage.ListVolsHandler", &AuthRPCArgs{}, &ListVols)
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if err != nil {
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return nil, toStorageErr(err)
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}
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return ListVols.Vols, nil
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}
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// StatVol - get volume info over the network.
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func (n *networkStorage) StatVol(volume string) (volInfo VolInfo, err error) {
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args := GenericVolArgs{Vol: 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 - Deletes a volume over the network.
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func (n *networkStorage) DeleteVol(volume string) (err error) {
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reply := AuthRPCReply{}
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args := GenericVolArgs{Vol: 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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func (n *networkStorage) PrepareFile(volume, path string, length int64) (err error) {
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reply := AuthRPCReply{}
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if err = n.rpcClient.Call("Storage.PrepareFileHandler", &PrepareFileArgs{
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Vol: volume,
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Path: path,
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Size: length,
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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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// AppendFile - append file writes buffer to a remote network path.
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func (n *networkStorage) AppendFile(volume, path string, buffer []byte) (err error) {
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reply := AuthRPCReply{}
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if err = n.rpcClient.Call("Storage.AppendFileHandler", &AppendFileArgs{
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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 err = n.rpcClient.Call("Storage.StatFileHandler", &StatFileArgs{
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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 err = n.rpcClient.Call("Storage.ReadAllHandler", &ReadAllArgs{
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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 at remote path and fills the buffer.
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func (n *networkStorage) ReadFile(volume string, path string, offset int64, buffer []byte) (m int64, err error) {
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defer func() {
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if r := recover(); r != nil {
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// Recover any panic from allocation, and return error.
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err = bytes.ErrTooLarge
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}
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}() // Do not crash the server.
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var result []byte
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err = n.rpcClient.Call("Storage.ReadFileHandler", &ReadFileArgs{
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Vol: volume,
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Path: path,
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Offset: offset,
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Buffer: 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 err = n.rpcClient.Call("Storage.ListDirHandler", &ListDirArgs{
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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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reply := AuthRPCReply{}
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if err = n.rpcClient.Call("Storage.DeleteFileHandler", &DeleteFileArgs{
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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 a remote file from source to destination.
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func (n *networkStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
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reply := AuthRPCReply{}
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if err = n.rpcClient.Call("Storage.RenameFileHandler", &RenameFileArgs{
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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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