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minio/rpc-client.go

221 lines
5.8 KiB

/*
* 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 main
import (
"net/http"
"net/rpc"
"strings"
"time"
)
type networkStorage struct {
netScheme string
netAddr string
netPath string
rpcClient *rpc.Client
httpClient *http.Client
}
const (
storageRPCPath = reservedBucket + "/storage"
)
// splits network path into its components Address and Path.
func splitNetPath(networkPath string) (netAddr, netPath string) {
index := strings.LastIndex(networkPath, ":")
netAddr = networkPath[:index]
netPath = networkPath[index+1:]
return netAddr, netPath
}
// Converts rpc.ServerError to underlying error. This function is
// written so that the storageAPI errors are consistent across network
// disks as well.
func toStorageErr(err error) error {
switch err.Error() {
case errDiskFull.Error():
return errDiskFull
case errVolumeNotFound.Error():
return errVolumeNotFound
case errVolumeExists.Error():
return errVolumeExists
case errFileNotFound.Error():
return errFileNotFound
case errIsNotRegular.Error():
return errIsNotRegular
case errVolumeNotEmpty.Error():
return errVolumeNotEmpty
case errFileAccessDenied.Error():
return errFileAccessDenied
case errVolumeAccessDenied.Error():
return errVolumeAccessDenied
}
return err
}
// Initialize new rpc client.
func newRPCClient(networkPath string) (StorageAPI, error) {
// Input validation.
if networkPath == "" || strings.LastIndex(networkPath, ":") == -1 {
return nil, errInvalidArgument
}
// TODO validate netAddr and netPath.
netAddr, netPath := splitNetPath(networkPath)
// Dial minio rpc storage http path.
rpcClient, err := rpc.DialHTTPPath("tcp", netAddr, storageRPCPath)
if err != nil {
return nil, err
}
// Initialize http client.
httpClient := &http.Client{
// Setting a sensible time out of 6minutes to wait for
// response headers. Request is pro-actively cancelled
// after 6minutes if no response was received from server.
Timeout: 6 * time.Minute,
Transport: http.DefaultTransport,
}
// Initialize network storage.
ndisk := &networkStorage{
netScheme: "http", // TODO: fix for ssl rpc support.
netAddr: netAddr,
netPath: netPath,
rpcClient: rpcClient,
httpClient: httpClient,
}
// Returns successfully here.
return ndisk, nil
}
// MakeVol - make a volume.
func (n networkStorage) MakeVol(volume string) error {
reply := GenericReply{}
if err := n.rpcClient.Call("Storage.MakeVolHandler", volume, &reply); err != nil {
return toStorageErr(err)
}
return nil
}
// ListVols - List all volumes.
func (n networkStorage) ListVols() (vols []VolInfo, err error) {
ListVols := ListVolsReply{}
err = n.rpcClient.Call("Storage.ListVolsHandler", "", &ListVols)
if err != nil {
return nil, err
}
return ListVols.Vols, nil
}
// StatVol - get current Stat volume info.
func (n networkStorage) StatVol(volume string) (volInfo VolInfo, err error) {
if err = n.rpcClient.Call("Storage.StatVolHandler", volume, &volInfo); err != nil {
return VolInfo{}, toStorageErr(err)
}
return volInfo, nil
}
// DeleteVol - Delete a volume.
func (n networkStorage) DeleteVol(volume string) error {
reply := GenericReply{}
if err := n.rpcClient.Call("Storage.DeleteVolHandler", volume, &reply); err != nil {
return toStorageErr(err)
}
return nil
}
// File operations.
// CreateFile - create file.
func (n networkStorage) AppendFile(volume, path string, buffer []byte) (err error) {
reply := GenericReply{}
if err = n.rpcClient.Call("Storage.AppendFileHandler", AppendFileArgs{
Vol: volume,
Path: path,
Buffer: buffer,
}, &reply); err != nil {
return toStorageErr(err)
}
return nil
}
// StatFile - get latest Stat information for a file at path.
func (n networkStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
if err = n.rpcClient.Call("Storage.StatFileHandler", StatFileArgs{
Vol: volume,
Path: path,
}, &fileInfo); err != nil {
return FileInfo{}, toStorageErr(err)
}
return fileInfo, nil
}
// ReadFile - reads a file.
func (n networkStorage) ReadFile(volume string, path string, offset int64, buffer []byte) (m int64, err error) {
if err = n.rpcClient.Call("Storage.ReadFileHandler", ReadFileArgs{
Vol: volume,
Path: path,
Offset: offset,
Buffer: buffer,
}, &m); err != nil {
return 0, toStorageErr(err)
}
return m, nil
}
// ListDir - list all entries at prefix.
func (n networkStorage) ListDir(volume, path string) (entries []string, err error) {
if err = n.rpcClient.Call("Storage.ListDirHandler", ListDirArgs{
Vol: volume,
Path: path,
}, &entries); err != nil {
return nil, toStorageErr(err)
}
// Return successfully unmarshalled results.
return entries, nil
}
// DeleteFile - Delete a file at path.
func (n networkStorage) DeleteFile(volume, path string) (err error) {
reply := GenericReply{}
if err = n.rpcClient.Call("Storage.DeleteFileHandler", DeleteFileArgs{
Vol: volume,
Path: path,
}, &reply); err != nil {
return toStorageErr(err)
}
return nil
}
// RenameFile - Rename file.
func (n networkStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
reply := GenericReply{}
if err = n.rpcClient.Call("Storage.RenameFileHandler", RenameFileArgs{
SrcVol: srcVolume,
SrcPath: srcPath,
DstVol: dstVolume,
DstPath: dstPath,
}, &reply); err != nil {
return toStorageErr(err)
}
return nil
}