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165 lines
3.5 KiB
165 lines
3.5 KiB
package light_test
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import (
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"context"
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"fmt"
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"io/ioutil"
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stdlog "log"
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"os"
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"time"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/abci/example/kvstore"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/light"
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"github.com/tendermint/tendermint/light/provider"
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httpp "github.com/tendermint/tendermint/light/provider/http"
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dbs "github.com/tendermint/tendermint/light/store/db"
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rpctest "github.com/tendermint/tendermint/rpc/test"
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)
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// Automatically getting new headers and verifying them.
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func ExampleClient_Update() {
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// Start a test application
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app := kvstore.NewApplication()
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n := rpctest.StartTendermint(app, rpctest.SuppressStdout)
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defer func() { rpctest.StopTendermint(n) }()
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// give Tendermint time to generate some blocks
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time.Sleep(5 * time.Second)
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dbDir, err := ioutil.TempDir("", "light-client-example")
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if err != nil {
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stdlog.Fatal(err)
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}
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defer os.RemoveAll(dbDir)
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var (
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config = n.Config()
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chainID = config.ChainID()
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)
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primary, err := httpp.New(chainID, config.RPC.ListenAddress)
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if err != nil {
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stdlog.Fatal(err)
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}
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block, err := primary.LightBlock(context.Background(), 2)
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if err != nil {
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stdlog.Fatal(err)
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}
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db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
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if err != nil {
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stdlog.Fatal(err)
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}
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c, err := light.NewClient(
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context.Background(),
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chainID,
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light.TrustOptions{
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Period: 504 * time.Hour, // 21 days
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Height: 2,
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Hash: block.Hash(),
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},
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primary,
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[]provider.Provider{primary}, // NOTE: primary should not be used here
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dbs.New(db),
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light.Logger(log.TestingLogger()),
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)
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if err != nil {
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stdlog.Fatal(err)
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}
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defer func() {
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if err := c.Cleanup(); err != nil {
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stdlog.Fatal(err)
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}
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}()
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time.Sleep(2 * time.Second)
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h, err := c.Update(context.Background(), time.Now())
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if err != nil {
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stdlog.Fatal(err)
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}
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if h != nil && h.Height > 2 {
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fmt.Println("successful update")
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} else {
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fmt.Println("update failed")
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}
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// Output: successful update
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}
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// Manually getting light blocks and verifying them.
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func ExampleClient_VerifyLightBlockAtHeight() {
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// Start a test application
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app := kvstore.NewApplication()
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n := rpctest.StartTendermint(app, rpctest.SuppressStdout)
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defer func() { rpctest.StopTendermint(n) }()
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// give Tendermint time to generate some blocks
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time.Sleep(5 * time.Second)
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dbDir, err := ioutil.TempDir("", "light-client-example")
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if err != nil {
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stdlog.Fatal(err)
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}
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defer os.RemoveAll(dbDir)
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var (
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config = n.Config()
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chainID = config.ChainID()
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)
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primary, err := httpp.New(chainID, config.RPC.ListenAddress)
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if err != nil {
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stdlog.Fatal(err)
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}
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block, err := primary.LightBlock(context.Background(), 2)
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if err != nil {
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stdlog.Fatal(err)
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}
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db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
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if err != nil {
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stdlog.Fatal(err)
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}
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c, err := light.NewClient(
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context.Background(),
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chainID,
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light.TrustOptions{
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Period: 504 * time.Hour, // 21 days
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Height: 2,
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Hash: block.Hash(),
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},
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primary,
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[]provider.Provider{primary}, // NOTE: primary should not be used here
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dbs.New(db),
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light.Logger(log.TestingLogger()),
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)
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if err != nil {
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stdlog.Fatal(err)
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}
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defer func() {
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if err := c.Cleanup(); err != nil {
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stdlog.Fatal(err)
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}
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}()
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_, err = c.VerifyLightBlockAtHeight(context.Background(), 3, time.Now())
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if err != nil {
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stdlog.Fatal(err)
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}
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h, err := c.TrustedLightBlock(3)
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if err != nil {
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stdlog.Fatal(err)
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}
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fmt.Println("got header", h.Height)
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// Output: got header 3
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}
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