Add example of P-chain partial signing

wallet/subnet/primary/examples/p-partial-signing/main.go

@@ -0,0 +1,105 @@
+// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"log"
+
+	"github.com/ava-labs/avalanchego/genesis"
+	"github.com/ava-labs/avalanchego/ids"
+	"github.com/ava-labs/avalanchego/utils/constants"
+	"github.com/ava-labs/avalanchego/utils/crypto/keychain"
+	"github.com/ava-labs/avalanchego/utils/set"
+	"github.com/ava-labs/avalanchego/utils/units"
+	"github.com/ava-labs/avalanchego/vms/components/avax"
+	"github.com/ava-labs/avalanchego/vms/platformvm"
+	"github.com/ava-labs/avalanchego/vms/platformvm/fx"
+	"github.com/ava-labs/avalanchego/vms/platformvm/txs"
+	"github.com/ava-labs/avalanchego/vms/secp256k1fx"
+	"github.com/ava-labs/avalanchego/wallet/chain/p/builder"
+	"github.com/ava-labs/avalanchego/wallet/chain/p/signer"
+	"github.com/ava-labs/avalanchego/wallet/chain/p/wallet"
+	"github.com/ava-labs/avalanchego/wallet/subnet/primary"
+	"github.com/ava-labs/avalanchego/wallet/subnet/primary/common"
+)
+
+func makeWallet(
+	ctx context.Context,
+	uri string,
+	addresses set.Set[ids.ShortID],
+	keychains ...keychain.Keychain,
+) (builder.Builder, []signer.Signer, error) {
+	state, err := primary.FetchState(ctx, uri, addresses)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	utxos := common.NewChainUTXOs(constants.PlatformChainID, state.UTXOs)
+	backend := wallet.NewBackend(state.PCTX, utxos, make(map[ids.ID]fx.Owner))
+	builder := builder.New(addresses, state.PCTX, backend)
+
+	signers := make([]signer.Signer, len(keychains))
+	for i, keychain := range keychains {
+		signers[i] = signer.New(keychain, backend)
+	}
+	return builder, signers, nil
+}
+
+func main() {
+	ctx := context.Background()
+	builder, signers, err := makeWallet(
+		ctx,
+		primary.LocalAPIURI,
+		set.Of(
+			genesis.EWOQKey.Address(),
+			genesis.VMRQKey.Address(),
+		),
+		secp256k1fx.NewKeychain(genesis.EWOQKey),
+		secp256k1fx.NewKeychain(genesis.VMRQKey),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	pContext := builder.Context()
+	unsignedTx, err := builder.NewBaseTx([]*avax.TransferableOutput{
+		{
+			Asset: avax.Asset{ID: pContext.AVAXAssetID},
+			Out: &secp256k1fx.TransferOutput{
+				Amt: 27 * units.MegaAvax,
+				OutputOwners: secp256k1fx.OutputOwners{
+					Threshold: 2,
+					Addrs: []ids.ShortID{
+						genesis.EWOQKey.Address(),
+						genesis.VMRQKey.Address(),
+					},
+				},
+			},
+		},
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	signedTx := &txs.Tx{Unsigned: unsignedTx}
+	for _, signer := range signers {
+		if err := signer.Sign(ctx, signedTx); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	client := platformvm.NewClient(primary.LocalAPIURI)
+	txID, err := client.IssueTx(ctx, signedTx.Bytes())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	txJSON, err := json.MarshalIndent(signedTx, "", "\t")
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Printf("Issued transaction %s\n%s", txID, string(txJSON))
+}