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164 lines
3.4 KiB
164 lines
3.4 KiB
package light_test
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import (
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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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"testing"
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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/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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// 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 = rpctest.GetConfig()
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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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header, err := primary.SignedHeader(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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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: header.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, chainID),
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// 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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c.Cleanup()
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}()
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time.Sleep(2 * time.Second)
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// XXX: 30 * time.Minute clock drift is needed because a) Tendermint strips
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// monotonic component (see types/time/time.go) b) single instance is being
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// run.
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// https://github.com/tendermint/tendermint/issues/4489
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h, err := c.Update(time.Now().Add(30 * time.Minute))
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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 headers and verifying them.
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func ExampleClient_VerifyHeaderAtHeight() {
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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 = rpctest.GetConfig()
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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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header, err := primary.SignedHeader(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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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: header.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, chainID),
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// 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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c.Cleanup()
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}()
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_, err = c.VerifyHeaderAtHeight(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.TrustedHeader(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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func TestMain(m *testing.M) {
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// start a tendermint node (and kvstore) in the background to test against
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app := kvstore.NewApplication()
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node := rpctest.StartTendermint(app, rpctest.SuppressStdout)
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code := m.Run()
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// and shut down proper at the end
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rpctest.StopTendermint(node)
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os.Exit(code)
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}
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