Recombine file chunks

combine.go

chunkSizeInBytes := 1048576
chunksDir := "/path/to/uploads/temp/3203610240-WildifeTactics"

/*
  Generate an empty file
*/
f, err := os.Create("testfile.mp4")
if err != nil {
  fmt.Printf("Error: %s", err)
}
defer f.Close()

//For every chunk, write it to the empty file. The number of iterations is determined from resumable.js


for i := 1; i <= 3055; i++ {
		relativePath := fmt.Sprintf("%s%s%d", chunksDir, "/part", i)
		fmt.Println("Chnk path: " + relativePath)

		writeOffset := int64(chunkSizeInBytes * (i - 1))
		if i == 1 {
			writeOffset = 0
		}
		dat, err := ioutil.ReadFile(relativePath)
		size, err := f.WriteAt(dat, writeOffset)
		if err != nil {
			fmt.Printf("Error: %s", err)
		}
		fmt.Printf("%d bytes written offset %d \n", size, writeOffset)

	}