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minio/cmd/storage-rest-client.go

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12 KiB

/*
* MinIO Cloud Storage, (C) 2018 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 cmd
import (
"bytes"
"crypto/tls"
"io"
"io/ioutil"
"net"
"net/url"
"path"
"strconv"
"encoding/gob"
"encoding/hex"
"fmt"
"strings"
"github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/rest"
xnet "github.com/minio/minio/pkg/net"
)
func isNetworkError(err error) bool {
if err == nil {
return false
}
if err.Error() == errConnectionStale.Error() {
return true
}
if uerr, isURLError := err.(*url.Error); isURLError {
if uerr.Timeout() {
return true
}
err = uerr.Err
}
_, isNetOpError := err.(*net.OpError)
return isNetOpError
}
// 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 {
if err == nil {
return nil
}
if isNetworkError(err) {
return errDiskNotFound
}
switch err.Error() {
case io.EOF.Error():
return io.EOF
case io.ErrUnexpectedEOF.Error():
return io.ErrUnexpectedEOF
case errUnexpected.Error():
return errUnexpected
case errDiskFull.Error():
return errDiskFull
case errVolumeNotFound.Error():
return errVolumeNotFound
case errVolumeExists.Error():
return errVolumeExists
case errFileNotFound.Error():
return errFileNotFound
case errFileNameTooLong.Error():
return errFileNameTooLong
case errFileAccessDenied.Error():
return errFileAccessDenied
case errIsNotRegular.Error():
return errIsNotRegular
case errVolumeNotEmpty.Error():
return errVolumeNotEmpty
case errVolumeAccessDenied.Error():
return errVolumeAccessDenied
case errCorruptedFormat.Error():
return errCorruptedFormat
case errUnformattedDisk.Error():
return errUnformattedDisk
case errInvalidAccessKeyID.Error():
return errInvalidAccessKeyID
case errAuthentication.Error():
return errAuthentication
case errRPCAPIVersionUnsupported.Error():
return errRPCAPIVersionUnsupported
case errServerTimeMismatch.Error():
return errServerTimeMismatch
}
if strings.Contains(err.Error(), "Bitrot verification mismatch") {
var expected string
var received string
fmt.Sscanf(err.Error(), "Bitrot verification mismatch - expected %s received %s", &expected, &received)
// Go's Sscanf %s scans "," that comes after the expected hash, hence remove it. Providing "," in the format string does not help.
expected = strings.TrimSuffix(expected, ",")
bitrotErr := hashMismatchError{expected, received}
return bitrotErr
}
return err
}
// Abstracts a remote disk.
type storageRESTClient struct {
endpoint Endpoint
restClient *rest.Client
connected bool
lastError error
instanceID string // REST server's instanceID which is sent with every request for validation.
}
// Wrapper to restClient.Call to handle network errors, in case of network error the connection is makred disconnected
// permanently. The only way to restore the storage connection is at the xl-sets layer by xlsets.monitorAndConnectEndpoints()
// after verifying format.json
func (client *storageRESTClient) call(method string, values url.Values, body io.Reader, length int64) (respBody io.ReadCloser, err error) {
if !client.connected {
return nil, errDiskNotFound
}
if values == nil {
values = make(url.Values)
}
values.Set(storageRESTInstanceID, client.instanceID)
respBody, err = client.restClient.Call(method, values, body, length)
if err == nil {
return respBody, nil
}
client.lastError = err
if isNetworkError(err) {
client.connected = false
}
return nil, toStorageErr(err)
}
// Stringer provides a canonicalized representation of network device.
func (client *storageRESTClient) String() string {
return client.endpoint.String()
}
// IsOnline - returns whether RPC client failed to connect or not.
func (client *storageRESTClient) IsOnline() bool {
return client.connected
}
// LastError - returns the network error if any.
func (client *storageRESTClient) LastError() error {
return client.lastError
}
// DiskInfo - fetch disk information for a remote disk.
func (client *storageRESTClient) DiskInfo() (info DiskInfo, err error) {
respBody, err := client.call(storageRESTMethodDiskInfo, nil, nil, -1)
if err != nil {
return
}
defer http.DrainBody(respBody)
err = gob.NewDecoder(respBody).Decode(&info)
return info, err
}
// MakeVol - create a volume on a remote disk.
func (client *storageRESTClient) MakeVol(volume string) (err error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
respBody, err := client.call(storageRESTMethodMakeVol, values, nil, -1)
defer http.DrainBody(respBody)
return err
}
// ListVols - List all volumes on a remote disk.
func (client *storageRESTClient) ListVols() (volinfo []VolInfo, err error) {
respBody, err := client.call(storageRESTMethodListVols, nil, nil, -1)
if err != nil {
return
}
defer http.DrainBody(respBody)
err = gob.NewDecoder(respBody).Decode(&volinfo)
return volinfo, err
}
// StatVol - get volume info over the network.
func (client *storageRESTClient) StatVol(volume string) (volInfo VolInfo, err error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
respBody, err := client.call(storageRESTMethodStatVol, values, nil, -1)
if err != nil {
return
}
defer http.DrainBody(respBody)
err = gob.NewDecoder(respBody).Decode(&volInfo)
return volInfo, err
}
// DeleteVol - Deletes a volume over the network.
func (client *storageRESTClient) DeleteVol(volume string) (err error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
respBody, err := client.call(storageRESTMethodDeleteVol, values, nil, -1)
defer http.DrainBody(respBody)
return err
}
// AppendFile - append to a file.
func (client *storageRESTClient) AppendFile(volume, path string, buffer []byte) error {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
reader := bytes.NewBuffer(buffer)
respBody, err := client.call(storageRESTMethodAppendFile, values, reader, -1)
defer http.DrainBody(respBody)
return err
}
func (client *storageRESTClient) CreateFile(volume, path string, length int64, r io.Reader) error {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
values.Set(storageRESTLength, strconv.Itoa(int(length)))
respBody, err := client.call(storageRESTMethodCreateFile, values, r, length)
defer http.DrainBody(respBody)
return err
}
// WriteAll - write all data to a file.
func (client *storageRESTClient) WriteAll(volume, path string, buffer []byte) error {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
reader := bytes.NewBuffer(buffer)
respBody, err := client.call(storageRESTMethodWriteAll, values, reader, -1)
defer http.DrainBody(respBody)
return err
}
// StatFile - stat a file.
func (client *storageRESTClient) StatFile(volume, path string) (info FileInfo, err error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
respBody, err := client.call(storageRESTMethodStatFile, values, nil, -1)
if err != nil {
return info, err
}
defer http.DrainBody(respBody)
err = gob.NewDecoder(respBody).Decode(&info)
return info, err
}
// ReadAll - reads all contents of a file.
func (client *storageRESTClient) ReadAll(volume, path string) ([]byte, error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
respBody, err := client.call(storageRESTMethodReadAll, values, nil, -1)
if err != nil {
return nil, err
}
defer http.DrainBody(respBody)
return ioutil.ReadAll(respBody)
}
// ReadFileStream - returns a reader for the requested file.
func (client *storageRESTClient) ReadFileStream(volume, path string, offset, length int64) (io.ReadCloser, error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
values.Set(storageRESTOffset, strconv.Itoa(int(offset)))
values.Set(storageRESTLength, strconv.Itoa(int(length)))
respBody, err := client.call(storageRESTMethodReadFileStream, values, nil, -1)
if err != nil {
return nil, err
}
return respBody, nil
}
// ReadFile - reads section of a file.
func (client *storageRESTClient) ReadFile(volume, path string, offset int64, buffer []byte, verifier *BitrotVerifier) (int64, error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
values.Set(storageRESTOffset, strconv.Itoa(int(offset)))
values.Set(storageRESTLength, strconv.Itoa(len(buffer)))
if verifier != nil {
values.Set(storageRESTBitrotAlgo, verifier.algorithm.String())
values.Set(storageRESTBitrotHash, hex.EncodeToString(verifier.sum))
} else {
values.Set(storageRESTBitrotAlgo, "")
values.Set(storageRESTBitrotHash, "")
}
respBody, err := client.call(storageRESTMethodReadFile, values, nil, -1)
if err != nil {
return 0, err
}
defer http.DrainBody(respBody)
n, err := io.ReadFull(respBody, buffer)
return int64(n), err
}
// ListDir - lists a directory.
func (client *storageRESTClient) ListDir(volume, dirPath string, count int, leafFile string) (entries []string, err error) {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTDirPath, dirPath)
values.Set(storageRESTCount, strconv.Itoa(count))
values.Set(storageRESTLeafFile, leafFile)
respBody, err := client.call(storageRESTMethodListDir, values, nil, -1)
if err != nil {
return nil, err
}
defer http.DrainBody(respBody)
err = gob.NewDecoder(respBody).Decode(&entries)
return entries, err
}
// DeleteFile - deletes a file.
func (client *storageRESTClient) DeleteFile(volume, path string) error {
values := make(url.Values)
values.Set(storageRESTVolume, volume)
values.Set(storageRESTFilePath, path)
respBody, err := client.call(storageRESTMethodDeleteFile, values, nil, -1)
defer http.DrainBody(respBody)
return err
}
// RenameFile - renames a file.
func (client *storageRESTClient) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
values := make(url.Values)
values.Set(storageRESTSrcVolume, srcVolume)
values.Set(storageRESTSrcPath, srcPath)
values.Set(storageRESTDstVolume, dstVolume)
values.Set(storageRESTDstPath, dstPath)
respBody, err := client.call(storageRESTMethodRenameFile, values, nil, -1)
defer http.DrainBody(respBody)
return err
}
// Gets peer storage server's instanceID - to be used with every REST call for validation.
func (client *storageRESTClient) getInstanceID() (err error) {
// getInstanceID() does not use storageRESTClient.call()
// function so we need to update lastError field here.
defer func() {
if err != nil {
client.lastError = err
}
}()
respBody, err := client.restClient.Call(storageRESTMethodGetInstanceID, nil, nil, -1)
if err != nil {
return err
}
defer http.DrainBody(respBody)
instanceIDBuf := make([]byte, 64)
n, err := io.ReadFull(respBody, instanceIDBuf)
if err != io.EOF && err != io.ErrUnexpectedEOF {
return err
}
client.instanceID = string(instanceIDBuf[:n])
return nil
}
// Close - marks the client as closed.
func (client *storageRESTClient) Close() error {
client.connected = false
client.restClient.Close()
return nil
}
// Returns a storage rest client.
func newStorageRESTClient(endpoint Endpoint) (*storageRESTClient, error) {
host, err := xnet.ParseHost(endpoint.Host)
if err != nil {
return nil, err
}
scheme := "http"
if globalIsSSL {
scheme = "https"
}
serverURL := &url.URL{
Scheme: scheme,
Host: endpoint.Host,
Path: path.Join(storageRESTPath, endpoint.Path),
}
var tlsConfig *tls.Config
if globalIsSSL {
tlsConfig = &tls.Config{
ServerName: host.Name,
RootCAs: globalRootCAs,
NextProtos: []string{"http/1.1"}, // Force http1.1
}
}
restClient, err := rest.NewClient(serverURL, tlsConfig, rest.DefaultRESTTimeout, newAuthToken)
if err != nil {
return nil, err
}
client := &storageRESTClient{endpoint: endpoint, restClient: restClient, connected: true}
client.connected = client.getInstanceID() == nil
return client, nil
}