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dag.go
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dag.go
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package httpapi
import (
"bytes"
"context"
"fmt"
"io/ioutil"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
format "github.com/ipfs/go-ipld-format"
"github.com/ipfs/interface-go-ipfs-core/options"
"github.com/ipfs/interface-go-ipfs-core/path"
multicodec "github.com/multiformats/go-multicodec"
)
type httpNodeAdder HttpApi
type HttpDagServ httpNodeAdder
type pinningHttpNodeAdder httpNodeAdder
func (api *HttpDagServ) Get(ctx context.Context, c cid.Cid) (format.Node, error) {
r, err := api.core().Block().Get(ctx, path.IpldPath(c))
if err != nil {
return nil, err
}
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
blk, err := blocks.NewBlockWithCid(data, c)
if err != nil {
return nil, err
}
return format.DefaultBlockDecoder.Decode(blk)
}
func (api *HttpDagServ) GetMany(ctx context.Context, cids []cid.Cid) <-chan *format.NodeOption {
out := make(chan *format.NodeOption)
for _, c := range cids {
// TODO: Consider limiting concurrency of this somehow
go func(c cid.Cid) {
n, err := api.Get(ctx, c)
select {
case out <- &format.NodeOption{Node: n, Err: err}:
case <-ctx.Done():
}
}(c)
}
return out
}
func (api *httpNodeAdder) add(ctx context.Context, nd format.Node, pin bool) error {
c := nd.Cid()
prefix := c.Prefix()
// preserve 'cid-codec' when sent over HTTP
cidCodec := multicodec.Code(prefix.Codec).String()
// 'format' got replaced by 'cid-codec' in https://github.com/ipfs/interface-go-ipfs-core/pull/80
// but we still support it here for backward-compatibility with use of CIDv0
format := ""
if prefix.Version == 0 {
cidCodec = ""
format = "v0"
}
stat, err := api.core().Block().Put(ctx, bytes.NewReader(nd.RawData()),
options.Block.Hash(prefix.MhType, prefix.MhLength),
options.Block.CidCodec(cidCodec),
options.Block.Format(format),
options.Block.Pin(pin))
if err != nil {
return err
}
if !stat.Path().Cid().Equals(c) {
return fmt.Errorf("cids didn't match - local %s, remote %s", c.String(), stat.Path().Cid().String())
}
return nil
}
func (api *httpNodeAdder) addMany(ctx context.Context, nds []format.Node, pin bool) error {
for _, nd := range nds {
// TODO: optimize
if err := api.add(ctx, nd, pin); err != nil {
return err
}
}
return nil
}
func (api *HttpDagServ) AddMany(ctx context.Context, nds []format.Node) error {
return (*httpNodeAdder)(api).addMany(ctx, nds, false)
}
func (api *HttpDagServ) Add(ctx context.Context, nd format.Node) error {
return (*httpNodeAdder)(api).add(ctx, nd, false)
}
func (api *pinningHttpNodeAdder) Add(ctx context.Context, nd format.Node) error {
return (*httpNodeAdder)(api).add(ctx, nd, true)
}
func (api *pinningHttpNodeAdder) AddMany(ctx context.Context, nds []format.Node) error {
return (*httpNodeAdder)(api).addMany(ctx, nds, true)
}
func (api *HttpDagServ) Pinning() format.NodeAdder {
return (*pinningHttpNodeAdder)(api)
}
func (api *HttpDagServ) Remove(ctx context.Context, c cid.Cid) error {
return api.core().Block().Rm(ctx, path.IpldPath(c)) //TODO: should we force rm?
}
func (api *HttpDagServ) RemoveMany(ctx context.Context, cids []cid.Cid) error {
for _, c := range cids {
// TODO: optimize
if err := api.Remove(ctx, c); err != nil {
return err
}
}
return nil
}
func (api *httpNodeAdder) core() *HttpApi {
return (*HttpApi)(api)
}
func (api *HttpDagServ) core() *HttpApi {
return (*HttpApi)(api)
}