Function ExampleClient

light/example_test.go:22–110

Manually getting light blocks and verifying them.

()

// Manually getting light blocks and verifying them.
func ExampleClient() {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	conf, err := rpctest.CreateConfig("ExampleClient_VerifyLightBlockAtHeight")
	if err != nil {
		stdlog.Fatal(err)
	}

	logger := log.TestingLogger()

	// Start a test application
	app := kvstore.NewApplication()

	_, closer, err := rpctest.StartTendermint(ctx, conf, app, rpctest.SuppressStdout)
	if err != nil {
		stdlog.Fatal(err)
	}
	defer func() { _ = closer(ctx) }()

	dbDir, err := ioutil.TempDir("", "light-client-example")
	if err != nil {
		stdlog.Fatal(err)
	}
	defer os.RemoveAll(dbDir)

	chainID := conf.ChainID()

	primary, err := httpp.New(chainID, conf.RPC.ListenAddress)
	if err != nil {
		stdlog.Fatal(err)
	}

	// give Tendermint time to generate some blocks
	time.Sleep(5 * time.Second)

	block, err := primary.LightBlock(ctx, 2)
	if err != nil {
		stdlog.Fatal(err)
	}

	db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
	if err != nil {
		stdlog.Fatal(err)
	}

	c, err := light.NewClient(ctx,
		chainID,
		light.TrustOptions{
			Period: 504 * time.Hour, // 21 days
			Height: 2,
			Hash:   block.Hash(),
		},
		primary,
		[]provider.Provider{primary}, // NOTE: primary should not be used here
		dbs.New(db),
		light.Logger(logger),
	)
	if err != nil {