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package light_test
import (
"context"
"fmt"
"io/ioutil"
stdlog "log"
"os"
"time"
dbm "github.com/tendermint/tm-db"
"github.com/tendermint/tendermint/abci/example/kvstore"
"github.com/tendermint/tendermint/libs/log"
"github.com/tendermint/tendermint/light"
"github.com/tendermint/tendermint/light/provider"
httpp "github.com/tendermint/tendermint/light/provider/http"
dbs "github.com/tendermint/tendermint/light/store/db"
rpctest "github.com/tendermint/tendermint/rpc/test"
)
// Automatically getting new headers and verifying them.
func ExampleClient_Update() {
// Start a test application
app := kvstore.NewApplication()
n := rpctest.StartTendermint(app, rpctest.SuppressStdout)
defer func() { rpctest.StopTendermint(n) }()
// give Tendermint time to generate some blocks
time.Sleep(5 * time.Second)
dbDir, err := ioutil.TempDir("", "light-client-example")
if err != nil {
stdlog.Fatal(err)
}
defer os.RemoveAll(dbDir)
var (
config = n.Config()
chainID = config.ChainID()
)
primary, err := httpp.New(chainID, config.RPC.ListenAddress)
if err != nil {
stdlog.Fatal(err)
}
block, err := primary.LightBlock(context.Background(), 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(
context.Background(),
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(log.TestingLogger()),
)
if err != nil {
stdlog.Fatal(err)
}
defer func() {
if err := c.Cleanup(); err != nil {
stdlog.Fatal(err)
}
}()
time.Sleep(2 * time.Second)
h, err := c.Update(context.Background(), time.Now())
if err != nil {
stdlog.Fatal(err)
}
if h != nil && h.Height > 2 {
fmt.Println("successful update")
} else {
fmt.Println("update failed")
}
// Output: successful update
}
// Manually getting light blocks and verifying them.
func ExampleClient_VerifyLightBlockAtHeight() {
// Start a test application
app := kvstore.NewApplication()
n := rpctest.StartTendermint(app, rpctest.SuppressStdout)
defer func() { rpctest.StopTendermint(n) }()
// give Tendermint time to generate some blocks
time.Sleep(5 * time.Second)
dbDir, err := ioutil.TempDir("", "light-client-example")
if err != nil {
stdlog.Fatal(err)
}
defer os.RemoveAll(dbDir)
var (
config = n.Config()
chainID = config.ChainID()
)
primary, err := httpp.New(chainID, config.RPC.ListenAddress)
if err != nil {
stdlog.Fatal(err)
}
block, err := primary.LightBlock(context.Background(), 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(
context.Background(),
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(log.TestingLogger()),
)
if err != nil {
stdlog.Fatal(err)
}
defer func() {
if err := c.Cleanup(); err != nil {
stdlog.Fatal(err)
}
}()
_, err = c.VerifyLightBlockAtHeight(context.Background(), 3, time.Now())
if err != nil {
stdlog.Fatal(err)
}
h, err := c.TrustedLightBlock(3)
if err != nil {
stdlog.Fatal(err)
}
fmt.Println("got header", h.Height)
// Output: got header 3
}