Awesome
rsync-go
This is a pure go implementation of the rsync algorithm.
This repo in particular is a fork of Daniel Teophanes's implementation (see the section for details)
Usage
Here's a simple example (without error checking):
import (
"os"
"bytes"
"gopkg.in/itchio/go-rsync.v0"
)
func main() {
srcReader, _ := os.Open("content-v2.bin")
defer srcReader.Close()
rs := &rsync.RSync{}
// here we store the whole signature in a byte slice,
// but it could just as well be sent over a network connection for example
sig := make([]rsync.BlockHash, 0, 10)
writeSignature := func(bl rsync.BlockHash) error {
sig = append(sig, bl)
return nil
}
rs.CreateSignature(srcReader, writeSignature)
targetReader, _ := os.Open("content-v1.bin")
opsOut := make(chan rsync.Operation)
writeOperation := func(op rsync.Operation) error {
opsOut <- op
return nil
}
go func() {
defer close(opsOut)
rs.CreateDelta(targetReader, writeOperation)
}()
srcWriter, _ := os.OpenFile("content-v2-reconstructed.bin")
srcReader.Seek(0, os.SEEK_SET)
rs.ApplyDelta(srcWriter, srcReader, opsOut)
}
Import
Creating a signature:
Links
- original repo: https://bitbucket.org/kardianos/rsync/
- paper behind the rsync algorithm: http://www.samba.org/~tridge/phd_thesis.pdf