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package main
import (
"flag"
"fmt"
"io"
"os"
"os/signal"
"path/filepath"
"syscall"
"github.com/mpolden/lftpq/lftp"
"github.com/mpolden/lftpq/queue"
)
type lister interface {
List(site, path string) ([]os.FileInfo, error)
}
type CLI struct {
Config string
Dryrun bool
Format string
Test bool
Quiet bool
Import bool
LocalDir string
LftpPath string
consumer queue.Consumer
lister lister
stderr io.Writer
stdout io.Writer
stdin io.Reader
}
func New() *CLI {
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGTERM, syscall.SIGINT, syscall.SIGPIPE)
cli := CLI{}
go func() {
<-sig
cli.unlock()
os.Exit(1)
}()
return &cli
}
func (c *CLI) Run() error {
cfg, err := queue.ReadConfig(c.Config)
if err != nil {
return err
}
if c.LocalDir != "" {
if err := cfg.SetLocalDir(c.LocalDir); err != nil {
return err
}
}
if c.Test {
json, err := cfg.JSON()
if err != nil {
return err
}
fmt.Fprintf(c.stdout, "%s\n", json)
return nil
}
var queues []queue.Queue
if c.Import {
if queues, err = queue.Read(cfg.Sites, c.stdin); err != nil {
return err
}
} else {
if err := c.lock(); err != nil {
return fmt.Errorf("already running: %s", err)
}
defer c.unlock()
queues = c.queuesFor(cfg.Sites)
}
for _, q := range queues {
if err := c.transfer(q); err != nil {
c.printf("error while transferring queue for %s: %s\n", q.Site.Name, err)
continue
}
}
return nil
}
func (c *CLI) lockfile() string { return filepath.Join(os.TempDir(), ".lftpqlock") }
func (c *CLI) lock() error {
_, err := os.OpenFile(c.lockfile(), os.O_CREATE|os.O_EXCL, 0644)
return err
}
func (c *CLI) unlock() { os.Remove(c.lockfile()) }
func (c *CLI) printf(format string, vs ...interface{}) {
alwaysPrint := false
for _, v := range vs {
if _, ok := v.(error); ok {
alwaysPrint = true
break
}
}
if !c.Quiet || alwaysPrint {
fmt.Fprint(c.stderr, "lftpq: ")
fmt.Fprintf(c.stderr, format, vs...)
}
}
func (c *CLI) queuesFor(sites []queue.Site) []queue.Queue {
var queues []queue.Queue
for _, s := range sites {
if s.Skip {
c.printf("skipping site %s\n", s.Name)
continue
}
var files []os.FileInfo
for _, dir := range s.Dirs {
f, err := c.lister.List(s.Name, dir)
if err != nil {
c.printf("error while listing %s on %s: %s\n", dir, s.Name, err)
continue
}
files = append(files, f...)
}
queue := queue.New(s, files)
queues = append(queues, queue)
}
return queues
}
func (c *CLI) transfer(q queue.Queue) error {
if c.Dryrun {
var (
out []byte
err error
)
if c.Format == "json" {
out, err = q.MarshalJSON()
out = append(out, 0x0a) // Add trailing newline
} else {
out, err = q.MarshalText()
}
if err == nil {
fmt.Fprint(c.stdout, string(out))
}
return err
}
if len(q.Transferable()) == 0 {
c.printf("%s queue is empty\n", q.Site.Name)
return nil
}
if err := q.Transfer(c.consumer); err != nil {
return err
}
return q.PostProcess(!c.Quiet)
}
func main() {
cli := New()
cli.stderr = os.Stderr
cli.stdout = os.Stdout
cli.stdin = os.Stdin
flag.StringVar(&cli.Config, "f", "~/.lftpqrc", "Path to config")
flag.BoolVar(&cli.Dryrun, "n", false, "Print queue and exit")
flag.StringVar(&cli.Format, "F", "lftp", "Format to use in dry-run mode")
flag.BoolVar(&cli.Test, "t", false, "Test and print config")
flag.BoolVar(&cli.Quiet, "q", false, "Do not print output from lftp")
flag.BoolVar(&cli.Import, "i", false, "Build queues from stdin")
flag.StringVar(&cli.LocalDir, "l", "", "Override local dir for this run")
flag.StringVar(&cli.LftpPath, "p", "lftp", "Path to lftp program")
flag.Parse()
client := lftp.Client{Path: cli.LftpPath, InheritIO: !cli.Quiet}
cli.lister = &client
cli.consumer = &client
if err := cli.Run(); err != nil {
cli.printf("%s\n", err)
os.Exit(1)
}
}
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