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filealloc

Malloc() but inside of a File. In Go.

Traits

The filealloc implements a malloc-style Space-management on file level. Unlike other similar packages that might be out there, filealloc is designed to be robust against loss-of-power or crashes WITHOUT the need for WAL logs of any kind.

  • filealloc doesn't store pointers to file-locations in the file.
  • filealloc uses bitmaps for block allocations, placed at deterministic fixed locations.

This ensures, that filealloc will not cease to function, even in case of file corruption of any sort. filealloc keeps going no matter what!

Example

fmt.Println("Hello")
var cfg = filealloc.NewFormatConfig(12)

fobj,_ := os.OpenFile("testbin",os.O_RDWR|os.O_CREATE,0600)
alloc := &filealloc.PageAllocator{
	Storage : fobj,
	FormatConfig : cfg,
}
alloc.Init()

// allocate 17 contiguous blocks
first, ok, err := alloc.AllocateBlocks(17,true)
fmt.Println(first,ok,err)

alloc.Close()