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helpers.go
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/
helpers.go
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package ipfsutil
import (
"context"
"errors"
"fmt"
"io"
"sync"
"time"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
ma "github.com/multiformats/go-multiaddr"
madns "github.com/multiformats/go-multiaddr-dns"
"go.uber.org/multierr"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
func ParseAndResolveIpfsAddr(ctx context.Context, addr string) (*peer.AddrInfo, error) {
maddr, err := ma.NewMultiaddr(addr)
if err != nil {
return nil, err
}
if !madns.Matches(maddr) {
return peer.AddrInfoFromP2pAddr(maddr)
}
addrs, err := madns.Resolve(ctx, maddr)
if err != nil {
return nil, err
}
if len(addrs) == 0 {
return nil, errors.New("fail to resolve the multiaddr:" + maddr.String())
}
var info peer.AddrInfo
for _, addr := range addrs {
taddr, id := peer.SplitAddr(addr)
if id == "" {
// not an ipfs addr, skipping.
continue
}
switch info.ID {
case "":
info.ID = id
case id:
default:
return nil, fmt.Errorf(
"ambiguous maddr %s could refer to %s or %s",
maddr,
info.ID,
id,
)
}
info.Addrs = append(info.Addrs, taddr)
}
return &info, nil
}
func ParseAndResolveRdvpMaddrs(ctx context.Context, log *zap.Logger, addrs []string) ([]*peer.AddrInfo, error) {
// Resolve all addresses
outPeersUnmatched := make([]*peer.AddrInfo, len(addrs))
var errs error
var outLock sync.Mutex
var wg sync.WaitGroup
wg.Add(len(addrs))
for i, v := range addrs {
go func(j int, addr string) {
defer wg.Done()
rdvpeer, err := ParseAndResolveIpfsAddr(ctx, addr)
if err != nil {
outLock.Lock()
defer outLock.Unlock()
errs = multierr.Append(errs, err)
return
}
fds := make([]zapcore.Field, len(rdvpeer.Addrs))
for i, maddr := range rdvpeer.Addrs {
key := fmt.Sprintf("#%d", i)
fds[i] = zap.String(key, maddr.String())
}
log.Debug("rdvp peer resolved addrs", fds...)
outPeersUnmatched[j] = rdvpeer
}(i, v)
}
wg.Wait()
if errs != nil {
return nil, errs
}
// Match peers by ID
outPeersMatched := make(map[peer.ID][]ma.Multiaddr)
for _, v := range outPeersUnmatched {
outPeersMatched[v.ID] = append(outPeersMatched[v.ID], v.Addrs...)
}
// Create the ultimate *peer.AddrInfo
var outPeers []*peer.AddrInfo
for id, maddrs := range outPeersMatched {
outPeers = append(outPeers, &peer.AddrInfo{
ID: id,
Addrs: maddrs,
})
}
return outPeers, nil
}
var ErrExpectedEOF = errors.New("red data when expecting EOF")
const DefaultCloseTimeout = time.Second * 5
func FullClose(s network.Stream) error {
// Start the close.
err := s.CloseWrite()
if err != nil {
return err
}
// We don't want to wait indefinitely
_ = s.SetDeadline(time.Now().Add(DefaultCloseTimeout))
// Trying with a long slice to fetch `n`.
n, err := s.Read([]byte{0})
if n > 0 || err == nil {
_ = s.Reset()
return ErrExpectedEOF
}
if err == io.EOF {
return nil
}
_ = s.Reset()
return err
}