/
main.go
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/
main.go
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/*
Copyright 2014 Gavin Bong.
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 (
"fmt"
"log"
"net"
"os"
"path/filepath"
"runtime"
"syscall"
"github.com/javouhey/seneca/io"
"github.com/javouhey/seneca/progress"
"github.com/javouhey/seneca/util"
)
var (
GitSHA string
Version string
listener net.Listener
ipc chan progress.Status
task1 *io.FrameGenerator
task2 *io.Muxer
task3 *io.GifWriter
)
func main() {
if len(os.Args) == 1 {
fmt.Printf("%s", util.HelpMessage)
syscall.Exit(0)
}
args := util.NewArguments()
if err := args.Parse(os.Args[1:]); err != nil {
fmt.Fprintf(os.Stderr, "%s\n\n%s\n", err, util.ShortHelp)
syscall.Exit(1)
}
if args.Verbose {
fmt.Printf(" %#v\n", args)
}
if args.Version {
printVersion()
syscall.Exit(0)
}
if args.Help {
fmt.Printf("%s", util.HelpMessage)
syscall.Exit(0)
}
if err := args.Validate(); err != nil {
fmt.Fprintf(os.Stderr, "%s\n\n%s\n", err, util.ShortHelp)
syscall.Exit(1)
}
var vr *io.VideoReader
var errVr error
filename, _ := util.SanitizeFile(args.VideoIn)
vr, errVr = io.NewVideoReader(filename, args.DryRun)
if errVr != nil {
fmt.Fprintf(os.Stderr, io.INVALID_VIDEO, filename, util.ShortHelp)
syscall.Exit(1)
}
if args.Verbose {
fmt.Printf("%s", vr)
}
// --- setup progress notification ---
listener := NewTCPListener(args.Port)
defer func() {
cleanup(vr)
listener.Close()
if args.Verbose {
fmt.Println("Closed TCP listener")
}
close(ipc)
if args.Verbose {
fmt.Println("Closed progress channel")
}
}()
go progress.StatusLogger(ipc)
go progress.Progress(listener, ipc, args.Port)
// --- Pipeline ---
reply := task1.Run(vr, args)
if err := <-reply; err != nil {
syscall.Exit(126)
}
wg := task2.Run(vr, args)
wg.Wait()
if err := task2.Error(); err != nil {
syscall.Exit(126)
}
task3.Run(vr, args)
/*
Sample code for cancelling a goroutine
time.Sleep(1 * time.Second)
log.Fatal(task3.Stop())
*/
if err := task3.Tombstone.Wait(); err != nil {
syscall.Exit(126)
}
sayGoodbye(vr)
}
func init() {
ipc = make(chan progress.Status)
task1 = new(io.FrameGenerator)
task2 = new(io.Muxer)
task3 = new(io.GifWriter)
runtime.GOMAXPROCS(3)
}
func NewTCPListener(port int) net.Listener {
listener, err := net.Listen("tcp", util.ToPort(port))
if err != nil {
log.Fatal(err)
}
return listener
}
func cleanup(vr *io.VideoReader) {
if vr != nil && !util.IsEmpty(vr.PngDir) {
if err := os.RemoveAll(vr.PngDir); err != nil {
fmt.Printf("WARNING: Removing %s encountered errors\n", vr.PngDir)
fmt.Printf("\t%s", err.Error())
}
}
}
func sayGoodbye(vr *io.VideoReader) {
if vr != nil && !util.IsEmpty(vr.TmpDir) {
fmt.Println("\n\nYour animated GIF is ready at location:")
fmt.Printf(" %s\n\n", filepath.Join(vr.TmpDir, vr.Gif))
}
}
func printVersion() {
fmt.Printf("\nSeneca version %s, git SHA %s\n", Version, GitSHA)
}
//@TODO 1. Ensure that the provided -from and -length does not exceed
// the duration of this video.
//func ValidateWithVideo(vr *io.VideoReader, args *util.Arguments) error {
// return nil
//}