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178 lines
4.8 KiB
178 lines
4.8 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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"net"
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"net/http"
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"net/rpc"
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"time"
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)
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type networkStorage struct {
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address string
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connection *rpc.Client
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httpClient *http.Client
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}
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const (
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connected = "200 Connected to Go RPC"
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dialTimeoutSecs = 30 // 30 seconds.
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)
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// Initialize new network storage.
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func newNetworkStorage(address string) (StorageAPI, error) {
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// Dial to the address with timeout of 30secs, this includes DNS resolution.
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conn, err := net.DialTimeout("tcp", address, dialTimeoutSecs*time.Second)
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if err != nil {
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return nil, err
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}
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// Initialize rpc client with dialed connection.
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rpcClient := rpc.NewClient(conn)
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// Initialize http client.
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httpClient := &http.Client{
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// Setting a sensible time out of 2minutes to wait for
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// response headers. Request is pro-actively cancelled
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// after 2minutes if no response was received from server.
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Timeout: 2 * time.Minute,
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Transport: http.DefaultTransport,
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}
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// Initialize network storage.
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ndisk := &networkStorage{
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address: address,
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connection: rpcClient,
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httpClient: httpClient,
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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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reply := GenericReply{}
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return n.connection.Call("Storage.MakeVolHandler", volume, &reply)
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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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ListVols := ListVolsReply{}
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err = n.connection.Call("Storage.ListVolsHandler", "", &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 err = n.connection.Call("Storage.StatVolHandler", volume, &volInfo); err != nil {
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return VolInfo{}, 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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reply := GenericReply{}
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return n.connection.Call("Storage.DeleteVolHandler", volume, &reply)
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}
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// File operations.
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// CreateFile - create file.
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func (n networkStorage) CreateFile(volume, path string) (writeCloser io.WriteCloser, err error) {
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createFileReply := CreateFileReply{}
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if err = n.connection.Call("Storage.CreateFileHandler", CreateFileArgs{
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Vol: volume,
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Path: path,
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}, &createFileReply); err != nil {
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return nil, err
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}
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contentType := "application/octet-stream"
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readCloser, writeCloser := io.Pipe()
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defer readCloser.Close()
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go n.httpClient.Post(createFileReply.URL, contentType, readCloser)
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return writeCloser, 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.connection.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{}, err
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}
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return fileInfo, 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) (reader io.ReadCloser, err error) {
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readFileReply := ReadFileReply{}
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if err = n.connection.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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}, &readFileReply); err != nil {
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return nil, err
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}
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resp, err := n.httpClient.Get(readFileReply.URL)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusOK {
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return nil, errors.New("Invalid response")
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}
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return resp.Body, nil
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}
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// ListFiles - List all files in a volume.
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func (n networkStorage) ListFiles(volume, prefix, marker string, recursive bool, count int) (files []FileInfo, eof bool, err error) {
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listFilesReply := ListFilesReply{}
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if err = n.connection.Call("Storage.ListFilesHandler", ListFilesArgs{
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Vol: volume,
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Prefix: prefix,
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Marker: marker,
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Recursive: recursive,
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Count: count,
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}, &listFilesReply); err != nil {
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return nil, true, err
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}
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// List of files.
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files = listFilesReply.Files
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// EOF.
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eof = listFilesReply.EOF
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return files, eof, 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 := GenericReply{}
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if err = n.connection.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 err
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}
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return nil
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}
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