/
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"
"path/filepath"
"runtime"
"sync"
"syscall"
"github.com/fatih/color"
"github.com/minio/cli"
"github.com/minio/mc/pkg/client"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio-xl/pkg/probe"
"github.com/minio/pb"
)
// mirror specific flags.
var (
mirrorFlags = []cli.Flag{
cli.BoolFlag{
Name: "help, h",
Usage: "Help of mirror.",
},
cli.BoolFlag{
Name: "force",
Usage: "Force overwrite of an existing target(s).",
},
}
)
// 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 single destination.",
Action: mainMirror,
Flags: append(mirrorFlags, globalFlags...),
CustomHelpTemplate: `NAME:
mc {{.Name}} - {{.Usage}}
USAGE:
mc {{.Name}} [FLAGS] SOURCE TARGET
FLAGS:
{{range .Flags}}{{.}}
{{end}}
EXAMPLES:
1. Mirror a bucket recursively from Minio cloud storage to a bucket on Amazon S3 cloud storage.
$ mc {{.Name}} play/photos/2014 s3/backup-photos
2. Mirror a local folder recursively to Amazon S3 cloud storage.
$ mc {{.Name}} backup/ s3/archive
3. Mirror a bucket from aliased Amazon S3 cloud storage to a folder on Windows.
$ mc {{.Name}} s3\documents\2014\ C:\backup\2014
`,
}
// mirrorMessage container for file mirror messages
type mirrorMessage struct {
Status string `json:"status"`
Source string `json:"source"`
Target string `json:"target"`
}
// String colorized mirror message
func (m mirrorMessage) String() string {
return console.Colorize("Mirror", fmt.Sprintf("‘%s’ -> ‘%s’", m.Source, m.Target))
}
// JSON jsonified mirror message
func (m mirrorMessage) JSON() string {
m.Status = "success"
mirrorMessageBytes, e := json.Marshal(m)
fatalIf(probe.NewError(e), "Unable to marshal into JSON.")
return string(mirrorMessageBytes)
}
// mirrorStatMessage container for mirror accounting message
type mirrorStatMessage struct {
Total int64
Transferred int64
Speed float64
}
// mirrorStatMessage mirror accounting message
func (c mirrorStatMessage) String() string {
speedBox := pb.FormatBytes(int64(c.Speed))
if speedBox == "" {
speedBox = "0 MB"
} else {
speedBox = speedBox + "/s"
}
message := fmt.Sprintf("Total: %s, Transferred: %s, Speed: %s", pb.FormatBytes(c.Total),
pb.FormatBytes(c.Transferred), speedBox)
return message
}
// doMirror - Mirror an object to multiple destination. mirrorURLs status contains a copy of sURLs and error if any.
func doMirror(sURLs mirrorURLs, progressReader *barSend, accountingReader *accounter, 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
}
sourceAlias := sURLs.SourceAlias
sourceURL := sURLs.SourceContent.URL
targetAlias := sURLs.TargetAlias
targetURL := sURLs.TargetContent.URL
length := sURLs.SourceContent.Size
if !globalQuiet && !globalJSON {
progressReader.SetCaption(sourceURL.String() + ": ")
}
reader, err := getSourceFromAlias(sourceAlias, sourceURL.String())
if err != nil {
if !globalQuiet && !globalJSON {
progressReader.ErrorGet(length)
}
sURLs.Error = err.Trace(sourceURL.String())
statusCh <- sURLs
return
}
var newReader io.ReadSeeker
if globalQuiet || globalJSON {
sourcePath := filepath.Join(sourceAlias, sourceURL.Path)
targetPath := filepath.Join(targetAlias, targetURL.Path)
printMsg(mirrorMessage{
Source: sourcePath,
Target: targetPath,
})
if globalJSON {
newReader = reader
}
if globalQuiet {
newReader = accountingReader.NewProxyReader(reader)
}
} else {
// set up progress
newReader = progressReader.NewProxyReader(reader)
}
err = putTargetFromAlias(targetAlias, targetURL.String(), newReader, length)
if err != nil {
if !globalQuiet && !globalJSON {
progressReader.ErrorPut(length)
}
sURLs.Error = err.Trace(targetURL.String())
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, progressReader *barSend) {
if !globalDebug && !globalJSON {
progressReader.Progress(sURLs.SourceContent.Size)
}
}
// doPrepareMirrorURLs scans the source URL and prepares a list of objects for mirroring.
func doPrepareMirrorURLs(session *sessionV6, isForce bool, trapCh <-chan bool) {
sourceURL := session.Header.CommandArgs[0] // first one is source.
targetURL := 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 !globalQuiet && !globalJSON { // set up progress bar
scanBar = scanBarFactory()
}
URLsCh := prepareMirrorURLs(sourceURL, targetURL, isForce)
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 !globalQuiet && !globalJSON {
console.Eraseline()
}
errorIf(sURLs.Error.Trace(), "Unable to prepare URLs for mirroring.")
break
}
if sURLs.isEmpty() {
break
}
jsonData, err := json.Marshal(sURLs)
if err != nil {
session.Delete()
fatalIf(probe.NewError(err), "Unable to marshal URLs into JSON.")
}
fmt.Fprintln(dataFP, string(jsonData))
if !globalQuiet && !globalJSON {
scanBar(sURLs.SourceContent.URL.String())
}
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 !globalQuiet && !globalJSON {
console.Eraseline()
}
session.Delete() // If we are interrupted during the URL scanning, we drop the session.
os.Exit(0)
}
}
session.Header.TotalBytes = totalBytes
session.Header.TotalObjects = totalObjects
session.Save()
}
// Session'fied mirror command.
func doMirrorSession(session *sessionV6) {
isForce := session.Header.CommandBoolFlags["force"]
trapCh := signalTrap(os.Interrupt, syscall.SIGTERM)
if !session.HasData() {
doPrepareMirrorURLs(session, isForce, trapCh)
}
// Enable accounting reader by default.
accntReader := newAccounter(session.Header.TotalBytes)
// Set up progress bar.
var progressReader *barSend
if !globalQuiet && !globalJSON {
progressReader = newProgressBar(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 !globalQuiet && !globalJSON {
progressReader.Finish()
} else {
accntStat := accntReader.Stat()
mrStatMessage := mirrorStatMessage{
Total: accntStat.Total,
Transferred: accntStat.Transferred,
Speed: accntStat.Speed,
}
console.Println(console.Colorize("Mirror", mrStatMessage.String()))
}
return
}
if sURLs.Error == nil {
session.Header.LastCopied = sURLs.SourceContent.URL.String()
session.Save()
} else {
// Print in new line and adjust to top so that we don't print over the ongoing progress bar
if !globalQuiet && !globalJSON {
console.Eraseline()
}
errorIf(sURLs.Error.Trace(), fmt.Sprintf("Failed to mirror ‘%s’.", sURLs.SourceContent.URL.String()))
// for all non critical errors we can continue for the remaining files
switch sURLs.Error.ToGoError().(type) {
// handle this specifically for filesystem related errors.
case client.BrokenSymlink:
continue
case client.TooManyLevelsSymlink:
continue
case client.PathNotFound:
continue
case client.PathInsufficientPermission:
continue
}
// for critical errors we should exit. Session can be resumed after the user figures out the problem
session.CloseAndDie()
}
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 !globalQuiet && !globalJSON {
console.Eraseline()
}
session.CloseAndDie()
}
}
}()
// 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.URL.String()) {
doMirrorFake(sURLs, progressReader)
} 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, progressReader, accntReader, mirrorQueue, mirrorWg, statusCh)
}
}
mirrorWg.Wait()
}()
wg.Wait()
}
// Main entry point for mirror command.
func mainMirror(ctx *cli.Context) {
// Set global flags from context.
setGlobalsFromContext(ctx)
// check 'mirror' cli arguments.
checkMirrorSyntax(ctx)
// Additional command speific theme customization.
console.SetColor("Mirror", color.New(color.FgGreen, color.Bold))
var e error
session := newSessionV6()
session.Header.CommandType = "mirror"
session.Header.RootPath, e = os.Getwd()
if e != nil {
session.Delete()
fatalIf(probe.NewError(e), "Unable to get current working folder.")
}
// Set command flags from context.
isForce := ctx.Bool("force")
session.Header.CommandBoolFlags["force"] = isForce
// extract URLs.
session.Header.CommandArgs = ctx.Args()
doMirrorSession(session)
session.Delete()
}