/
mirror-main.go
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/
mirror-main.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 (
"bufio"
"encoding/json"
"fmt"
"io"
"math"
"os"
"runtime"
"sync"
"github.com/fatih/color"
"github.com/minio/cli"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio/pkg/probe"
)
// Mirror folders recursively from a single source to many destinations
var mirrorCmd = cli.Command{
Name: "mirror",
Usage: "Mirror folders recursively from a single source to many destinations.",
Action: mainMirror,
CustomHelpTemplate: `NAME:
mc {{.Name}} - {{.Usage}}
USAGE:
mc {{.Name}}{{if .Flags}} [ARGS...]{{end}} SOURCE TARGET [TARGET ...] {{if .Description}}
DESCRIPTION:
{{.Description}}{{end}}{{if .Flags}}
FLAGS:
{{range .Flags}}{{.}}
{{end}}{{ end }}
EXAMPLES:
1. Mirror a bucket recursively from Minio cloud storage to multiple buckets on Amazon S3 cloud storage.
$ mc {{.Name}} https://play.minio.io:9000/photos/2014... https://s3.amazonaws.com/backup-photos https://s3-west-1.amazonaws.com/local-photos
2. Mirror a local folder recursively to Minio cloud storage and Amazon S3 cloud storage.
$ mc {{.Name}} backup/... https://play.minio.io:9000/archive https://s3.amazonaws.com/archive
3. Mirror a bucket from aliased Amazon S3 cloud storage to multiple folders on Windows.
$ mc {{.Name}} s3:documents/2014/... C:\backup\2014 C:\shared\volume\backup\2014
4. Mirror a local folder of non english character recursively to Amazon s3 cloud storage and Minio cloud storage.
$ mc {{.Name}} 本語/... s3:mylocaldocuments play:backup
`,
}
// MirrorMessage container for file mirror messages
type MirrorMessage struct {
Source string `json:"source"`
Targets []string `json:"targets"`
}
// String string printer for mirror message
func (s MirrorMessage) String() string {
if !globalJSONFlag {
return console.Colorize("Mirror", fmt.Sprintf("‘%s’ -> ‘%s’", s.Source, s.Targets))
}
mirrorMessageBytes, e := json.Marshal(s)
fatalIf(probe.NewError(e), "Unable to marshal into JSON.")
return string(mirrorMessageBytes)
}
// doMirror - Mirror an object to multiple destination. mirrorURLs status contains a copy of sURLs and error if any.
func doMirror(sURLs mirrorURLs, bar *barSend, mirrorQueueCh <-chan bool, wg *sync.WaitGroup, statusCh chan<- mirrorURLs) {
defer wg.Done() // Notify that this copy routine is done.
defer func() {
<-mirrorQueueCh
}()
if sURLs.Error != nil { // Errorneous sURLs passed.
sURLs.Error = sURLs.Error.Trace()
statusCh <- sURLs
return
}
if !globalQuietFlag && !globalJSONFlag {
bar.SetCaption(sURLs.SourceContent.Name + ": ")
}
reader, length, err := getSource(sURLs.SourceContent.Name)
if err != nil {
if !globalQuietFlag && !globalJSONFlag {
bar.ErrorGet(int64(length))
}
sURLs.Error = err.Trace(sURLs.SourceContent.Name)
statusCh <- sURLs
return
}
var targetURLs []string
for _, targetContent := range sURLs.TargetContents {
targetURLs = append(targetURLs, targetContent.Name)
}
var newReader io.ReadCloser
if globalQuietFlag || globalJSONFlag {
console.Println(MirrorMessage{
Source: sURLs.SourceContent.Name,
Targets: targetURLs,
}.String())
newReader = reader
} else {
// set up progress
newReader = bar.NewProxyReader(reader)
}
defer newReader.Close()
err = putTargets(targetURLs, length, newReader)
if err != nil {
if !globalQuietFlag && !globalJSONFlag {
bar.ErrorPut(int64(length))
}
sURLs.Error = err.Trace(targetURLs...)
statusCh <- sURLs
return
}
sURLs.Error = nil // just for safety
statusCh <- sURLs
}
// doMirrorFake - Perform a fake mirror to update the progress bar appropriately.
func doMirrorFake(sURLs mirrorURLs, bar *barSend) {
if !globalDebugFlag || !globalJSONFlag {
bar.Progress(sURLs.SourceContent.Size)
}
}
// doPrepareMirrorURLs scans the source URL and prepares a list of objects for mirroring.
func doPrepareMirrorURLs(session *sessionV2, trapCh <-chan bool) {
sourceURL := session.Header.CommandArgs[0] // first one is source.
targetURLs := session.Header.CommandArgs[1:]
var totalBytes int64
var totalObjects int
// Create a session data file to store the processed URLs.
dataFP := session.NewDataWriter()
var scanBar scanBarFunc
if !globalQuietFlag && !globalJSONFlag { // set up progress bar
scanBar = scanBarFactory("")
}
URLsCh := prepareMirrorURLs(sourceURL, targetURLs)
done := false
for done == false {
select {
case sURLs, ok := <-URLsCh:
if !ok { // Done with URL prepration
done = true
break
}
if sURLs.Error != nil {
// Print in new line and adjust to top so that we don't print over the ongoing scan bar
if !globalQuietFlag && !globalJSONFlag {
console.Printf("%c[2K\n", 27)
console.Printf("%c[A", 27)
}
errorIf(sURLs.Error.Trace(), "Unable to prepare URLs for mirroring.")
break
}
if sURLs.isEmpty() {
break
}
jsonData, err := json.Marshal(sURLs)
if err != nil {
session.Close()
fatalIf(probe.NewError(err), "Unable to marshal URLs into JSON.")
}
fmt.Fprintln(dataFP, string(jsonData))
if !globalQuietFlag && !globalJSONFlag {
scanBar(sURLs.SourceContent.Name)
}
totalBytes += sURLs.SourceContent.Size
totalObjects++
case <-trapCh:
// Print in new line and adjust to top so that we don't print over the ongoing scan bar
if !globalQuietFlag && !globalJSONFlag {
console.Printf("%c[2K\n", 27)
console.Printf("%c[A", 27)
}
session.Close() // If we are interrupted during the URL scanning, we drop the session.
session.Delete()
os.Exit(0)
}
}
session.Header.TotalBytes = totalBytes
session.Header.TotalObjects = totalObjects
session.Save()
}
func doMirrorCmdSession(session *sessionV2) {
trapCh := signalTrap(os.Interrupt, os.Kill)
if !session.HasData() {
doPrepareMirrorURLs(session, trapCh)
}
// Set up progress bar.
var bar barSend
if !globalQuietFlag && !globalJSONFlag {
bar = newCpBar()
bar.Extend(session.Header.TotalBytes)
}
// Prepare URL scanner from session data file.
scanner := bufio.NewScanner(session.NewDataReader())
// isCopied returns true if an object has been already copied
// or not. This is useful when we resume from a session.
isCopied := isCopiedFactory(session.Header.LastCopied)
wg := new(sync.WaitGroup)
// Limit numner of mirror routines based on available CPU resources.
mirrorQueue := make(chan bool, int(math.Max(float64(runtime.NumCPU())-1, 1)))
defer close(mirrorQueue)
// Status channel for receiveing mirror return status.
statusCh := make(chan mirrorURLs)
// Go routine to monitor doMirror status and signal traps.
wg.Add(1)
go func() {
defer wg.Done()
for {
select {
case sURLs, ok := <-statusCh: // Receive status.
if !ok { // We are done here. Top level function has returned.
if !globalQuietFlag && !globalJSONFlag {
bar.Finish()
}
return
}
if sURLs.Error == nil {
session.Header.LastCopied = sURLs.SourceContent.Name
} else {
// Print in new line and adjust to top so that we don't print over the ongoing progress bar
if !globalQuietFlag && !globalJSONFlag {
console.Printf("%c[2K\n", 27)
console.Printf("%c[A", 27)
}
errorIf(sURLs.Error.Trace(), "Failed to mirror.")
}
case <-trapCh: // Receive interrupt notification.
// Print in new line and adjust to top so that we don't print over the ongoing progress bar
if !globalQuietFlag && !globalJSONFlag {
console.Printf("%c[2K\n", 27)
console.Printf("%c[A", 27)
}
session.Close()
session.Info()
os.Exit(0)
}
}
}()
// Go routine to perform concurrently mirroring.
wg.Add(1)
go func() {
defer wg.Done()
mirrorWg := new(sync.WaitGroup)
defer close(statusCh)
for scanner.Scan() {
var sURLs mirrorURLs
json.Unmarshal([]byte(scanner.Text()), &sURLs)
if isCopied(sURLs.SourceContent.Name) {
doMirrorFake(sURLs, &bar)
} else {
// Wait for other mirror routines to
// complete. We only have limited CPU
// and network resources.
mirrorQueue <- true
// Account for each mirror routines we start.
mirrorWg.Add(1)
// Do mirroring in background concurrently.
go doMirror(sURLs, &bar, mirrorQueue, mirrorWg, statusCh)
}
}
mirrorWg.Wait()
}()
wg.Wait()
}
func mainMirror(ctx *cli.Context) {
checkMirrorSyntax(ctx)
console.SetCustomTheme(map[string]*color.Color{
"Mirror": color.New(color.FgGreen, color.Bold),
})
var e error
session := newSessionV2()
session.Header.CommandType = "mirror"
session.Header.RootPath, e = os.Getwd()
if e != nil {
session.Close()
session.Delete()
fatalIf(probe.NewError(e), "Unable to get current working folder.")
}
// extract URLs.
var err *probe.Error
session.Header.CommandArgs, err = args2URLs(ctx.Args())
if err != nil {
session.Close()
session.Delete()
fatalIf(err.Trace(ctx.Args()...), fmt.Sprintf("One or more unknown argument types found in ‘%s’.", ctx.Args()))
}
doMirrorCmdSession(session)
session.Close()
session.Delete()
}