rclone/swiftsync.go

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// Sync files and directories to and from swift
//
// Nick Craig-Wood <nick@craig-wood.com>
package main
import (
"flag"
"fmt"
"log"
"os"
"runtime"
"runtime/pprof"
"strings"
"sync"
)
// Globals
var (
// Flags
cpuprofile = flag.String("cpuprofile", "", "Write cpu profile to file")
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snet = flag.Bool("snet", false, "Use internal service network") // FIXME not implemented
verbose = flag.Bool("verbose", false, "Print lots more stuff")
quiet = flag.Bool("quiet", false, "Print as little stuff as possible")
checkers = flag.Int("checkers", 8, "Number of checkers to run in parallel.")
transfers = flag.Int("transfers", 4, "Number of file transfers to run in parallel.")
)
// Read FsObjects~s on in send to out if they need uploading
//
// FIXME potentially doing lots of MD5SUMS at once
func Checker(in, out FsObjectsChan, fdst Fs, wg *sync.WaitGroup) {
defer wg.Done()
for src := range in {
dst := fdst.NewFsObject(src.Remote())
if dst == nil {
src.Debugf("Couldn't find local file - download")
out <- src
continue
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}
// Check to see if can store this
if !src.Storable() {
continue
}
// Check to see if changed or not
if Equal(src, dst) {
src.Debugf("Unchanged skipping")
continue
}
out <- src
}
}
// Read FsObjects on in and copy them
func Copier(in FsObjectsChan, fdst Fs, wg *sync.WaitGroup) {
defer wg.Done()
for src := range in {
fdst.Put(src)
}
}
// Copies fsrc into fdst
func Copy(fdst, fsrc Fs) {
err := fdst.Mkdir()
if err != nil {
log.Fatal("Failed to make destination")
}
to_be_checked := fsrc.List()
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to_be_uploaded := make(FsObjectsChan, *transfers)
var checkerWg sync.WaitGroup
checkerWg.Add(*checkers)
for i := 0; i < *checkers; i++ {
go Checker(to_be_checked, to_be_uploaded, fdst, &checkerWg)
}
var copierWg sync.WaitGroup
copierWg.Add(*transfers)
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for i := 0; i < *transfers; i++ {
go Copier(to_be_uploaded, fdst, &copierWg)
}
log.Printf("Waiting for checks to finish")
checkerWg.Wait()
close(to_be_uploaded)
log.Printf("Waiting for transfers to finish")
copierWg.Wait()
}
// Copy~s from source to dest
func copy_(fdst, fsrc Fs) {
Copy(fdst, fsrc)
}
// List the Fs to stdout
func List(f Fs) {
// FIXME error?
in := f.List()
for fs := range in {
// FIXME
// if object.PseudoDirectory {
// fmt.Printf("%9s %19s %s\n", "Directory", "-", fs.Remote())
// } else {
// FIXME ModTime is expensive?
modTime, _ := fs.ModTime()
fmt.Printf("%9d %19s %s\n", fs.Size(), modTime.Format("2006-01-02 15:04:05"), fs.Remote())
// fmt.Printf("%9d %19s %s\n", fs.Size(), object.LastModified.Format("2006-01-02 15:04:05"), fs.Remote())
// }
}
}
// Lists files in a container
func list(fdst, fsrc Fs) {
if fdst == nil {
SwiftContainers()
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return
}
List(fdst)
}
// Makes a destination directory or container
func mkdir(fdst, fsrc Fs) {
err := fdst.Mkdir()
if err != nil {
log.Fatalf("Mkdir failed: %s", err)
}
}
// Removes a container but not if not empty
func rmdir(fdst, fsrc Fs) {
err := fdst.Rmdir()
if err != nil {
log.Fatalf("Rmdir failed: %s", err)
}
}
// Removes a container and all of its contents
//
// FIXME doesn't delete local directories
func purge(fdst, fsrc Fs) {
to_be_deleted := fdst.List()
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var wg sync.WaitGroup
wg.Add(*transfers)
for i := 0; i < *transfers; i++ {
go func() {
defer wg.Done()
for dst := range to_be_deleted {
err := dst.Remove()
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if err != nil {
log.Printf("%s: Couldn't delete: %s\n", dst.Remote(), err)
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} else {
log.Printf("%s: Deleted\n", dst.Remote())
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}
}
}()
}
log.Printf("Waiting for deletions to finish")
wg.Wait()
log.Printf("Deleting path")
rmdir(fdst, fsrc)
}
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type Command struct {
name string
help string
run func(fdst, fsrc Fs)
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minArgs, maxArgs int
}
// checkArgs checks there are enough arguments and prints a message if not
func (cmd *Command) checkArgs(args []string) {
if len(args) < cmd.minArgs {
syntaxError()
fmt.Fprintf(os.Stderr, "Command %s needs %d arguments mininum\n", cmd.name, cmd.minArgs)
os.Exit(1)
} else if len(args) > cmd.maxArgs {
syntaxError()
fmt.Fprintf(os.Stderr, "Command %s needs %d arguments maximum\n", cmd.name, cmd.maxArgs)
os.Exit(1)
}
}
var Commands = []Command{
{
"copy",
`<source> <destination>
Copy the source to the destination. Doesn't transfer
unchanged files, testing first by modification time then by
MD5SUM. Doesn't delete files from the destination.
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`,
copy_,
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2, 2,
},
{
"ls",
`[<path>]
List the path. If no parameter is supplied then it lists the
available swift containers.
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`,
list,
0, 1,
},
{
"mkdir",
`<path>
Make the path if it doesn't already exist
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`,
mkdir,
1, 1,
},
{
"rmdir",
`<path>
Remove the path. Note that you can't remove a path with
objects in it, use purge for that
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`,
rmdir,
1, 1,
},
{
"purge",
`<path>
Remove the path and all of its contents.
`,
purge,
1, 1,
},
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}
// syntaxError prints the syntax
func syntaxError() {
fmt.Fprintf(os.Stderr, `Sync files and directories to and from swift
Syntax: [options] subcommand <parameters> <parameters...>
Subcommands:
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`)
for i := range Commands {
cmd := &Commands[i]
fmt.Fprintf(os.Stderr, " %s: %s\n", cmd.name, cmd.help)
}
fmt.Fprintf(os.Stderr, "Options:\n")
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, `
It is only necessary to use a unique prefix of the subcommand, eg 'up' for 'upload'.
`)
}
// Exit with the message
func fatal(message string, args ...interface{}) {
syntaxError()
fmt.Fprintf(os.Stderr, message, args...)
os.Exit(1)
}
func main() {
flag.Usage = syntaxError
flag.Parse()
args := flag.Args()
runtime.GOMAXPROCS(runtime.NumCPU())
// Setup profiling if desired
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
if len(args) < 1 {
fatal("No command supplied\n")
}
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cmd := strings.ToLower(args[0])
args = args[1:]
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// Find the command doing a prefix match
var found *Command
for i := range Commands {
command := &Commands[i]
// exact command name found - use that
if command.name == cmd {
found = command
break
} else if strings.HasPrefix(command.name, cmd) {
if found != nil {
log.Fatalf("Not unique - matches multiple commands %q", cmd)
}
found = command
}
}
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if found == nil {
log.Fatalf("Unknown command %q", cmd)
}
found.checkArgs(args)
// Make source and destination fs
var fdst, fsrc Fs
var err error
if len(args) >= 1 {
fdst, err = NewFs(args[0])
if err != nil {
log.Fatal("Failed to create file system: ", err)
}
}
if len(args) >= 2 {
fsrc, err = NewFs(args[1])
if err != nil {
log.Fatal("Failed to create destination file system: ", err)
}
fsrc, fdst = fdst, fsrc
}
// Run the actual command
found.run(fdst, fsrc)
}