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get.go
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get.go
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package dagcmd
import (
"fmt"
"io"
"github.com/ipfs/go-ipfs/core/commands/cmdenv"
ipldlegacy "github.com/ipfs/go-ipld-legacy"
"github.com/ipfs/interface-go-ipfs-core/path"
"github.com/ipld/go-ipld-prime"
"github.com/ipld/go-ipld-prime/multicodec"
"github.com/ipld/go-ipld-prime/traversal"
mc "github.com/multiformats/go-multicodec"
cmds "github.com/ipfs/go-ipfs-cmds"
)
func dagGet(req *cmds.Request, res cmds.ResponseEmitter, env cmds.Environment) error {
api, err := cmdenv.GetApi(env, req)
if err != nil {
return err
}
format, _ := req.Options["format"].(string)
var fCodec mc.Code
if err := fCodec.Set(format); err != nil {
return err
}
rp, err := api.ResolvePath(req.Context, path.New(req.Arguments[0]))
if err != nil {
return err
}
obj, err := api.Dag().Get(req.Context, rp.Cid())
if err != nil {
return err
}
universal, ok := obj.(ipldlegacy.UniversalNode)
if !ok {
return fmt.Errorf("%T is not a valid IPLD node", obj)
}
finalNode := universal.(ipld.Node)
if len(rp.Remainder()) > 0 {
remainderPath := ipld.ParsePath(rp.Remainder())
finalNode, err = traversal.Get(finalNode, remainderPath)
if err != nil {
return err
}
}
encoder, err := multicodec.LookupEncoder(uint64(fCodec))
if err != nil {
return fmt.Errorf("invalid encoding: %s - %s", format, err)
}
r, w := io.Pipe()
go func() {
defer w.Close()
if err := encoder(finalNode, w); err != nil {
_ = res.CloseWithError(err)
}
}()
return res.Emit(r)
}