forked from minio/mc
/
cp-main.go
339 lines (293 loc) · 9.55 KB
/
cp-main.go
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/*
* Minio Client (C) 2014, 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"
"net"
"os"
"runtime"
"sync"
"github.com/fatih/color"
"github.com/minio/cli"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio/pkg/probe"
)
// Copy files and folders from many sources to a single destination.
var cpCmd = cli.Command{
Name: "cp",
Usage: "Copy files and folders from many sources to a single destination.",
Action: mainCopy,
CustomHelpTemplate: `NAME:
mc {{.Name}} - {{.Usage}}
USAGE:
mc {{.Name}} SOURCE [SOURCE...] TARGET
EXAMPLES:
1. Copy list of objects from local file system to Amazon S3 cloud storage.
$ mc {{.Name}} Music/*.ogg https://s3.amazonaws.com/jukebox/
2. Copy a bucket recursively from Minio cloud storage to Amazon S3 cloud storage.
$ mc {{.Name}} https://play.minio.io:9000/photos/burningman2011... https://s3.amazonaws.com/private-photos/burningman/
3. Copy multiple local folders recursively to Minio cloud storage.
$ mc {{.Name}} backup/2014/... backup/2015/... https://play.minio.io:9000/archive/
4. Copy a bucket recursively from aliased Amazon S3 cloud storage to local filesystem on Windows.
$ mc {{.Name}} s3/documents/2014/... C:\backup\2014
5. Copy an object of non english characters to Amazon S3 cloud storage.
$ mc {{.Name}} 本語 s3/andoria/本語
6. Copy local folder with space characters to Amazon S3 cloud storage.
$ mc {{.Name}} 'workdir/documents/May 2014...' s3/miniocloud
`,
}
// CopyMessage container for file copy messages
type CopyMessage struct {
Source string `json:"source"`
Target string `json:"target"`
Length int64 `json:"length"`
}
// String colorized copy message
func (c CopyMessage) String() string {
return console.Colorize("Copy", fmt.Sprintf("‘%s’ -> ‘%s’", c.Source, c.Target))
}
// JSON jsonified copy message
func (c CopyMessage) JSON() string {
copyMessageBytes, err := json.Marshal(c)
fatalIf(probe.NewError(err), "Failed to marshal copy message.")
return string(copyMessageBytes)
}
// doCopy - Copy a singe file from source to destination
func doCopy(cpURLs copyURLs, bar *barSend, cpQueue <-chan bool, wg *sync.WaitGroup, statusCh chan<- copyURLs) {
defer wg.Done() // Notify that this copy routine is done.
defer func() {
<-cpQueue
}()
if cpURLs.Error != nil {
cpURLs.Error.Trace()
statusCh <- cpURLs
return
}
if !globalQuietFlag && !globalJSONFlag {
bar.SetCaption(cpURLs.SourceContent.Name + ": ")
}
reader, length, err := getSource(cpURLs.SourceContent.Name)
if err != nil {
if !globalQuietFlag && !globalJSONFlag {
bar.ErrorGet(length)
}
cpURLs.Error = err.Trace()
statusCh <- cpURLs
return
}
var newReader io.ReadCloser
if globalQuietFlag || globalJSONFlag {
Prints("%s\n", CopyMessage{
Source: cpURLs.SourceContent.Name,
Target: cpURLs.TargetContent.Name,
Length: cpURLs.SourceContent.Size,
})
newReader = reader
} else {
// set up progress
newReader = bar.NewProxyReader(reader)
}
defer newReader.Close()
if err := putTarget(cpURLs.TargetContent.Name, length, newReader); err != nil {
if !globalQuietFlag && !globalJSONFlag {
bar.ErrorPut(length)
}
cpURLs.Error = err.Trace()
statusCh <- cpURLs
return
}
cpURLs.Error = nil // just for safety
statusCh <- cpURLs
}
// doCopyFake - Perform a fake copy to update the progress bar appropriately.
func doCopyFake(cURLs copyURLs, bar *barSend) {
if !globalQuietFlag && !globalJSONFlag {
bar.Progress(cURLs.SourceContent.Size)
}
}
// doPrepareCopyURLs scans the source URL and prepares a list of objects for copying.
func doPrepareCopyURLs(session *sessionV2, trapCh <-chan bool) {
// Separate source and target. 'cp' can take only one target,
// but any number of sources, even the recursive URLs mixed in-between.
sourceURLs := session.Header.CommandArgs[:len(session.Header.CommandArgs)-1]
targetURL := session.Header.CommandArgs[len(session.Header.CommandArgs)-1] // Last one is target
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 := prepareCopyURLs(sourceURLs, targetURL)
done := false
for done == false {
select {
case cpURLs, ok := <-URLsCh:
if !ok { // Done with URL prepration
done = true
break
}
if cpURLs.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.Eraseline()
}
errorIf(cpURLs.Error.Trace(), "Unable to prepare URL for copying.")
break
}
jsonData, err := json.Marshal(cpURLs)
if err != nil {
session.Delete()
fatalIf(probe.NewError(err), "Unable to prepare URL for copying. Error in JSON marshaling.")
}
fmt.Fprintln(dataFP, string(jsonData))
if !globalQuietFlag && !globalJSONFlag {
scanBar(cpURLs.SourceContent.Name)
}
totalBytes += cpURLs.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.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()
}
func doCopyCmdSession(session *sessionV2) {
trapCh := signalTrap(os.Interrupt, os.Kill)
if !session.HasData() {
doPrepareCopyURLs(session, trapCh)
}
var bar barSend
if !globalQuietFlag && !globalJSONFlag { // set up progress bar
bar = newProgressBar()
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 number of copy routines based on available CPU resources.
cpQueue := make(chan bool, int(math.Max(float64(runtime.NumCPU())-1, 1)))
defer close(cpQueue)
// Status channel for receiveing copy return status.
statusCh := make(chan copyURLs)
// Go routine to monitor doCopy status and signal traps.
wg.Add(1)
go func() {
defer wg.Done()
for {
select {
case cpURLs, ok := <-statusCh: // Receive status.
if !ok { // We are done here. Top level function has returned.
if !globalQuietFlag && !globalJSONFlag {
bar.Finish()
}
return
}
if cpURLs.Error == nil {
session.Header.LastCopied = cpURLs.SourceContent.Name
session.Save()
} else {
// Print in new line and adjust to top so that we don't print over the ongoing progress bar
if !globalQuietFlag && !globalJSONFlag {
console.Eraseline()
}
errorIf(cpURLs.Error.Trace(), fmt.Sprintf("Failed to copy ‘%s’.", cpURLs.SourceContent.Name))
// all the cases which are handled where session should be saved are contained in the following
// switch case, we shouldn't be saving sessions for all errors since some errors might need to be
// reported to user properly.
//
// All other critical cases should be handled properly gracefully
// handle more errors and save the session.
switch cpURLs.Error.ToGoError().(type) {
case *net.OpError:
gracefulSessionSave(session)
case net.Error:
gracefulSessionSave(session)
}
}
case <-trapCh: // Receive interrupt notification.
if !globalQuietFlag && !globalJSONFlag {
console.Eraseline()
}
gracefulSessionSave(session)
}
}
}()
// Go routine to perform concurrently copying.
wg.Add(1)
go func() {
defer wg.Done()
copyWg := new(sync.WaitGroup)
defer close(statusCh)
for scanner.Scan() {
var cpURLs copyURLs
json.Unmarshal([]byte(scanner.Text()), &cpURLs)
if isCopied(cpURLs.SourceContent.Name) {
doCopyFake(cpURLs, &bar)
} else {
// Wait for other copy routines to
// complete. We only have limited CPU
// and network resources.
cpQueue <- true
// Account for each copy routines we start.
copyWg.Add(1)
// Do copying in background concurrently.
go doCopy(cpURLs, &bar, cpQueue, copyWg, statusCh)
}
}
copyWg.Wait()
}()
wg.Wait()
}
// mainCopy is bound to sub-command
func mainCopy(ctx *cli.Context) {
checkCopySyntax(ctx)
console.SetCustomTheme(map[string]*color.Color{
"Copy": color.New(color.FgGreen, color.Bold),
})
session := newSessionV2()
var e error
session.Header.CommandType = "cp"
session.Header.RootPath, e = os.Getwd()
if e != nil {
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.Delete()
fatalIf(err.Trace(), "One or more unknown URL types passed.")
}
doCopyCmdSession(session)
session.Delete()
}