/
common-methods.go
212 lines (193 loc) · 5.33 KB
/
common-methods.go
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/*
* Minio Client (C) 2015 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 (
"io"
"os"
"runtime"
"strings"
"sync"
"github.com/minio/mc/pkg/client"
"github.com/minio/mc/pkg/client/fs"
"github.com/minio/mc/pkg/client/s3v2"
"github.com/minio/mc/pkg/client/s3v4"
"github.com/minio/minio/pkg/probe"
)
// Check if the target URL represents folder. It may or may not exist yet.
func isTargetURLDir(targetURL string) bool {
targetURLParse := client.NewURL(targetURL)
_, targetContent, perr := url2Stat(targetURL)
if perr != nil {
if targetURLParse.Path == string(targetURLParse.Separator) && targetURLParse.Scheme != "" {
return false
}
if strings.HasSuffix(targetURLParse.Path, string(targetURLParse.Separator)) {
return true
}
return false
}
if !targetContent.Type.IsDir() { // Target is a dir.
return false
}
return true
}
// getSource gets a reader from URL
func getSource(sourceURL string) (reader io.ReadCloser, length int64, err *probe.Error) {
sourceClnt, err := url2Client(sourceURL)
if err != nil {
return nil, 0, err.Trace()
}
return sourceClnt.GetObject(0, 0)
}
// putTarget writes to URL from reader. If length=0, read until EOF.
func putTarget(targetURL string, length int64, reader io.Reader) *probe.Error {
targetClnt, err := url2Client(targetURL)
if err != nil {
return err.Trace(targetURL)
}
err = targetClnt.PutObject(length, reader)
if err != nil {
return err.Trace(targetURL)
}
return nil
}
// putTargets writes to URL from reader. If length=0, read until EOF.
func putTargets(targetURLs []string, length int64, reader io.Reader) *probe.Error {
var tgtReaders []*io.PipeReader
var tgtWriters []*io.PipeWriter
var tgtClients []client.Client
errCh := make(chan *probe.Error)
defer close(errCh)
for _, targetURL := range targetURLs {
tgtClient, err := url2Client(targetURL)
if err != nil {
return err.Trace(targetURL)
}
tgtClients = append(tgtClients, tgtClient)
tgtReader, tgtWriter := io.Pipe()
tgtReaders = append(tgtReaders, tgtReader)
tgtWriters = append(tgtWriters, tgtWriter)
}
go func() {
var writers []io.Writer
for _, tgtWriter := range tgtWriters {
writers = append(writers, io.Writer(tgtWriter))
}
multiTgtWriter := io.MultiWriter(writers...)
var e error
switch length {
case 0:
_, e = io.Copy(multiTgtWriter, reader)
default:
_, e = io.CopyN(multiTgtWriter, reader, length)
}
for _, tgtWriter := range tgtWriters {
if e != nil {
tgtWriter.CloseWithError(e)
}
tgtWriter.Close()
}
}()
var wg sync.WaitGroup
errorCh := make(chan *probe.Error, len(tgtClients))
func() { // Parallel putObject
defer close(errorCh) // Each routine gets to return one err status.
for i := range tgtClients {
wg.Add(1)
// make local copy for go routine
tgtClient := tgtClients[i]
tgtReader := tgtReaders[i]
go func(targetClient client.Client, reader io.ReadCloser, errorCh chan<- *probe.Error) {
defer wg.Done()
defer reader.Close()
err := targetClient.PutObject(length, reader)
if err != nil {
errorCh <- err.Trace()
return
}
}(tgtClient, tgtReader, errorCh)
}
wg.Wait()
}()
// Return on first error encounter.
err := <-errorCh
if err != nil {
return err.Trace()
}
return nil // success.
}
// getNewClient gives a new client interface
func getNewClient(urlStr string, auth hostConfig) (client.Client, *probe.Error) {
url := client.NewURL(urlStr)
switch url.Type {
case client.Object: // Minio and S3 compatible cloud storage
s3Config := new(client.Config)
s3Config.AccessKeyID = func() string {
if auth.AccessKeyID == globalAccessKeyID {
return ""
}
return auth.AccessKeyID
}()
s3Config.SecretAccessKey = func() string {
if auth.SecretAccessKey == globalSecretAccessKey {
return ""
}
return auth.SecretAccessKey
}()
s3Config.AppName = "Minio"
s3Config.AppVersion = globalMCVersion
s3Config.AppComments = []string{os.Args[0], runtime.GOOS, runtime.GOARCH}
s3Config.HostURL = urlStr
s3Config.Debug = globalDebugFlag
var s3Client client.Client
var err *probe.Error
if auth.API == "S3v2" {
s3Client, err = s3v2.New(s3Config)
} else {
s3Client, err = s3v4.New(s3Config)
}
if err != nil {
return nil, err.Trace()
}
return s3Client, nil
case client.Filesystem:
fsClient, err := fs.New(urlStr)
if err != nil {
return nil, err.Trace()
}
return fsClient, nil
}
return nil, errInitClient(urlStr).Trace()
}
func url2Client(url string) (client.Client, *probe.Error) {
urlconfig, err := getHostConfig(url)
if err != nil {
return nil, err.Trace(url)
}
client, err := getNewClient(url, urlconfig)
if err != nil {
return nil, err.Trace(url)
}
return client, nil
}
// bucketExists returns error
func bucketExists(URL string) *probe.Error {
_, _, err := url2Stat(URL)
if err != nil {
return err.Trace()
}
return nil
}