let wantlist command show other peers wantlists

core/commands/bitswap.go

@@ -3,10 +3,12 @@ package commands
 import (
 	"bytes"
 	"fmt"
+	"io"
+
 	cmds "github.com/ipfs/go-ipfs/commands"
 	bitswap "github.com/ipfs/go-ipfs/exchange/bitswap"
+	peer "github.com/ipfs/go-ipfs/p2p/peer"
 	u "github.com/ipfs/go-ipfs/util"
-	"io"
 )
 
 var BitswapCmd = &cmds.Command{
@@ -26,6 +28,9 @@ var showWantlistCmd = &cmds.Command{
 		ShortDescription: `
 Print out all blocks currently on the bitswap wantlist for the local peer`,
 	},
+	Options: []cmds.Option{
+		cmds.StringOption("peer", "p", "specify which peer to show wantlist for (default self)"),
+	},
 	Type: KeyList{},
 	Run: func(req cmds.Request, res cmds.Response) {
 		nd, err := req.Context().GetNode()
@@ -39,7 +44,21 @@ Print out all blocks currently on the bitswap wantlist for the local peer`,
 			return
 		}
 
+		pstr, found, err := req.Option("peer").String()
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+		if found {
+			pid, err := peer.IDB58Decode(pstr)
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+			res.SetOutput(&KeyList{bs.WantlistForPeer(pid)})
+		} else {
 			res.SetOutput(&KeyList{bs.GetWantlist()})
+		}
 	},
 	Marshalers: cmds.MarshalerMap{
 		cmds.Text: KeyListTextMarshaler,

exchange/bitswap/bitswap.go

@@ -175,6 +175,14 @@ func (bs *Bitswap) GetBlock(parent context.Context, k u.Key) (*blocks.Block, err
 	}
 }
 
+func (bs *Bitswap) WantlistForPeer(p peer.ID) []u.Key {
+	var out []u.Key
+	for _, e := range bs.engine.WantlistForPeer(p) {
+		out = append(out, e.Key)
+	}
+	return out
+}
+
 // GetBlocks returns a channel where the caller may receive blocks that
 // correspond to the provided |keys|. Returns an error if BitSwap is unable to
 // begin this request within the deadline enforced by the context.

exchange/bitswap/decision/engine.go

@@ -96,6 +96,16 @@ func NewEngine(ctx context.Context, bs bstore.Blockstore) *Engine {
 	return e
 }
 
+func (e *Engine) WantlistForPeer(p peer.ID) (out []wl.Entry) {
+	e.lock.Lock()
+	partner, ok := e.ledgerMap[p]
+	if ok {
+		out = partner.wantList.SortedEntries()
+	}
+	e.lock.Unlock()
+	return out
+}
+
 func (e *Engine) taskWorker(ctx context.Context) {
 	defer close(e.outbox) // because taskWorker uses the channel exclusively
 	for {