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split_reassembler.go
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split_reassembler.go
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package core
// function to split a file into chunks
import (
"bufio"
"context"
"encoding/json"
"fmt"
"github.com/ipfs/go-cid"
"os"
"sort"
)
type SplitReassembler struct {
SplitReassemblerParam
}
type SplitReassemblerParam struct {
LightNode *LightNode
}
func NewSplitReassembler(param SplitReassemblerParam) SplitReassembler {
return SplitReassembler{
SplitReassemblerParam: param,
}
}
// cid of the splitupload file
func (c SplitReassembler) ReassembleFileFromCid(cidStr string) (*os.File, error) {
cidDecode, err := cid.Decode(cidStr)
fmt.Println(cidDecode)
if err != nil {
return nil, fmt.Errorf("Error decoding cid: %v", err)
}
node, err := c.LightNode.Node.Get(context.Background(), cidDecode)
if err != nil {
return nil, fmt.Errorf("Error getting node: %v", err)
}
var splits []UploadSplits
json.Unmarshal(node.RawData(), &splits)
fmt.Println(splits[0].Cid)
keys := make([]int, 0)
for _, split := range splits {
keys = append(keys, split.Index)
}
sort.Ints(keys)
fmt.Println(keys)
file, err := os.Create("output")
w := bufio.NewWriter(file)
for _, k := range keys {
fmt.Println(splits[k].Cid)
cidGet, err := cid.Decode(splits[k].Cid)
if err != nil {
return nil, fmt.Errorf("Error decoding cid: %v", err)
}
splitNode, err := c.LightNode.Node.Get(context.Background(), cidGet)
if err != nil {
return nil, fmt.Errorf("Error getting node: %v", err)
}
if _, err := w.Write(splitNode.RawData()); err != nil {
return nil, fmt.Errorf("Error writing to file: %v", err)
}
}
defer file.Close()
if err := w.Flush(); err != nil {
return nil, fmt.Errorf("Error flushing writer: %v", err)
}
return file, nil
}