Revision 827e2e3581e2654e6b0c1b64c915fb35ee803b99 authored by William Banfield on 16 May 2022, 20:33:47 UTC, committed by William Banfield on 16 May 2022, 20:33:47 UTC
1 parent 62ecdf5
example_test.go
package light_test
import (
"context"
"testing"
"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"
httpp "github.com/tendermint/tendermint/light/provider/http"
dbs "github.com/tendermint/tendermint/light/store/db"
rpctest "github.com/tendermint/tendermint/rpc/test"
)
// Manually getting light blocks and verifying them.
func TestExampleClient(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
conf, err := rpctest.CreateConfig(t, "ExampleClient_VerifyLightBlockAtHeight")
if err != nil {
t.Fatal(err)
}
logger, err := log.NewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo)
if err != nil {
t.Fatal(err)
}
// Start a test application
app := kvstore.NewApplication()
_, closer, err := rpctest.StartTendermint(ctx, conf, app, rpctest.SuppressStdout)
if err != nil {
t.Fatal(err)
}
defer func() { _ = closer(ctx) }()
dbDir := t.TempDir()
chainID := conf.ChainID()
primary, err := httpp.New(chainID, conf.RPC.ListenAddress)
if err != nil {
t.Fatal(err)
}
// give Tendermint time to generate some blocks
time.Sleep(5 * time.Second)
block, err := primary.LightBlock(ctx, 2)
if err != nil {
t.Fatal(err)
}
db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
if err != nil {
t.Fatal(err)
}
c, err := light.NewClient(ctx,
chainID,
light.TrustOptions{
Period: 504 * time.Hour, // 21 days
Height: 2,
Hash: block.Hash(),
},
primary,
nil,
dbs.New(db),
light.Logger(logger),
)
if err != nil {
t.Fatal(err)
}
defer func() {
if err := c.Cleanup(); err != nil {
t.Fatal(err)
}
}()
// wait for a few more blocks to be produced
time.Sleep(2 * time.Second)
// veify the block at height 3
_, err = c.VerifyLightBlockAtHeight(ctx, 3, time.Now())
if err != nil {
t.Fatal(err)
}
// retrieve light block at height 3
_, err = c.TrustedLightBlock(3)
if err != nil {
t.Fatal(err)
}
// update to the latest height
lb, err := c.Update(ctx, time.Now())
if err != nil {
t.Fatal(err)
}
logger.Info("verified light block", "light-block", lb)
}
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