minio/network-fs.go
2016-04-16 17:57:14 -07:00

244 lines
6.5 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 main
import (
"errors"
"fmt"
"io"
"net/http"
"net/rpc"
"net/url"
urlpath "path"
"strconv"
"strings"
"time"
)
type networkFS struct {
netScheme string
netAddr string
netPath string
rpcClient *rpc.Client
httpClient *http.Client
}
const (
storageRPCPath = reservedBucket + "/rpc/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 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 network file system.
func newNetworkFS(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 := &networkFS{
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 networkFS) 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 networkFS) 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 networkFS) 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 networkFS) 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 networkFS) CreateFile(volume, path string) (writeCloser io.WriteCloser, err error) {
writeURL := new(url.URL)
writeURL.Scheme = n.netScheme
writeURL.Host = n.netAddr
writeURL.Path = fmt.Sprintf("%s/upload/%s", storageRPCPath, urlpath.Join(volume, path))
contentType := "application/octet-stream"
readCloser, writeCloser := io.Pipe()
go func() {
resp, err := n.httpClient.Post(writeURL.String(), contentType, readCloser)
if err != nil {
readCloser.CloseWithError(err)
return
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
if resp.StatusCode == http.StatusNotFound {
readCloser.CloseWithError(errFileNotFound)
return
}
readCloser.CloseWithError(errors.New("Invalid response."))
return
}
// Close the reader.
readCloser.Close()
}
}()
return writeCloser, nil
}
// StatFile - get latest Stat information for a file at path.
func (n networkFS) 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 networkFS) ReadFile(volume string, path string, offset int64) (reader io.ReadCloser, err error) {
readURL := new(url.URL)
readURL.Scheme = n.netScheme
readURL.Host = n.netAddr
readURL.Path = fmt.Sprintf("%s/download/%s", storageRPCPath, urlpath.Join(volume, path))
readQuery := make(url.Values)
readQuery.Set("offset", strconv.FormatInt(offset, 10))
readURL.RawQuery = readQuery.Encode()
resp, err := n.httpClient.Get(readURL.String())
if err != nil {
return nil, err
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
if resp.StatusCode == http.StatusNotFound {
return nil, errFileNotFound
}
return nil, errors.New("Invalid response")
}
}
return resp.Body, nil
}
// ListFiles - List all files in a volume.
func (n networkFS) ListFiles(volume, prefix, marker string, recursive bool, count int) (files []FileInfo, eof bool, err error) {
listFilesReply := ListFilesReply{}
if err = n.rpcClient.Call("Storage.ListFilesHandler", ListFilesArgs{
Vol: volume,
Prefix: prefix,
Marker: marker,
Recursive: recursive,
Count: count,
}, &listFilesReply); err != nil {
return nil, true, toStorageErr(err)
}
// Return successfully unmarshalled results.
return listFilesReply.Files, listFilesReply.EOF, nil
}
// DeleteFile - Delete a file at path.
func (n networkFS) 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
}