Add RemoveSubnetValidatorTx wallet example (ava-labs#2743)

wallet/subnet/primary/examples/remove-subnet-validator/main.go

@@ -0,0 +1,57 @@
+// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package main
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"github.com/ava-labs/avalanchego/genesis"
+	"github.com/ava-labs/avalanchego/ids"
+	"github.com/ava-labs/avalanchego/vms/secp256k1fx"
+	"github.com/ava-labs/avalanchego/wallet/subnet/primary"
+)
+
+func main() {
+	key := genesis.EWOQKey
+	uri := primary.LocalAPIURI
+	kc := secp256k1fx.NewKeychain(key)
+	subnetIDStr := "29uVeLPJB1eQJkzRemU8g8wZDw5uJRqpab5U2mX9euieVwiEbL"
+	nodeIDStr := "NodeID-7Xhw2mDxuDS44j42TCB6U5579esbSt3Lg"
+
+	subnetID, err := ids.FromString(subnetIDStr)
+	if err != nil {
+		log.Fatalf("failed to parse subnet ID: %s\n", err)
+	}
+
+	nodeID, err := ids.NodeIDFromString(nodeIDStr)
+	if err != nil {
+		log.Fatalf("failed to parse node ID: %s\n", err)
+	}
+
+	ctx := context.Background()
+
+	// NewWalletWithTxs fetches the available UTXOs owned by [kc] on the network
+	// that [uri] is hosting and registers [subnetID].
+	walletSyncStartTime := time.Now()
+	wallet, err := primary.NewWalletWithTxs(ctx, uri, kc, subnetID)
+	if err != nil {
+		log.Fatalf("failed to initialize wallet: %s\n", err)
+	}
+	log.Printf("synced wallet in %s\n", time.Since(walletSyncStartTime))
+
+	// Get the P-chain wallet
+	pWallet := wallet.P()
+
+	removeValidatorStartTime := time.Now()
+	removeValidatorTxID, err := pWallet.IssueRemoveSubnetValidatorTx(
+		nodeID,
+		subnetID,
+	)
+	if err != nil {
+		log.Fatalf("failed to issue remove subnet validator transaction: %s\n", err)
+	}
+	log.Printf("removed subnet validator %s from %s with %s in %s\n", nodeID, subnetID, removeValidatorTxID, time.Since(removeValidatorStartTime))
+}