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package light_test
import (
"context"
"os"
"testing"
"time"
"github.com/stretchr/testify/require"
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"
"github.com/tendermint/tendermint/types"
)
// NOTE: these are ports of the tests from example_test.go but
// rewritten as more conventional tests.
// Automatically getting new headers and verifying them.
func TestClientIntegration_Update(t *testing.T) {
t.Parallel()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
conf, err := rpctest.CreateConfig(t.Name())
require.NoError(t, err)
logger := log.NewTestingLogger(t)
// Start a test application
app := kvstore.NewApplication()
_, closer, err := rpctest.StartTendermint(ctx, conf, app, rpctest.SuppressStdout)
require.NoError(t, err)
defer func() { require.NoError(t, closer(ctx)) }()
// give Tendermint time to generate some blocks
time.Sleep(5 * time.Second)
dbDir, err := os.MkdirTemp("", "light-client-test-update-example")
require.NoError(t, err)
defer os.RemoveAll(dbDir)
chainID := conf.ChainID()
primary, err := httpp.New(chainID, conf.RPC.ListenAddress)
require.NoError(t, err)
// give Tendermint time to generate some blocks
block, err := waitForBlock(ctx, primary, 2)
require.NoError(t, err)
db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
require.NoError(t, 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),
)
require.NoError(t, err)
defer func() { require.NoError(t, c.Cleanup()) }()
// ensure Tendermint is at height 3 or higher
_, err = waitForBlock(ctx, primary, 3)
require.NoError(t, err)
h, err := c.Update(ctx, time.Now())
require.NoError(t, err)
require.NotNil(t, h)
require.True(t, h.Height > 2)
}
// Manually getting light blocks and verifying them.
func TestClientIntegration_VerifyLightBlockAtHeight(t *testing.T) {
t.Parallel()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
conf, err := rpctest.CreateConfig(t.Name())
require.NoError(t, err)
logger := log.NewTestingLogger(t)
// Start a test application
app := kvstore.NewApplication()
_, closer, err := rpctest.StartTendermint(ctx, conf, app, rpctest.SuppressStdout)
require.NoError(t, err)
defer func() { require.NoError(t, closer(ctx)) }()
dbDir, err := os.MkdirTemp("", "light-client-test-verify-example")
require.NoError(t, err)
defer os.RemoveAll(dbDir)
chainID := conf.ChainID()
primary, err := httpp.New(chainID, conf.RPC.ListenAddress)
require.NoError(t, err)
// give Tendermint time to generate some blocks
block, err := waitForBlock(ctx, primary, 2)
require.NoError(t, err)
db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
require.NoError(t, 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),
)
require.NoError(t, err)
defer func() { require.NoError(t, c.Cleanup()) }()
// ensure Tendermint is at height 3 or higher
_, err = waitForBlock(ctx, primary, 3)
require.NoError(t, err)
_, err = c.VerifyLightBlockAtHeight(ctx, 3, time.Now())
require.NoError(t, err)
h, err := c.TrustedLightBlock(3)
require.NoError(t, err)
require.EqualValues(t, 3, h.Height)
}
func waitForBlock(ctx context.Context, p provider.Provider, height int64) (*types.LightBlock, error) {
for {
block, err := p.LightBlock(ctx, height)
switch err {
case nil:
return block, nil
// node isn't running yet, wait 1 second and repeat
case provider.ErrNoResponse, provider.ErrHeightTooHigh:
timer := time.NewTimer(1 * time.Second)
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-timer.C:
}
default:
return nil, err
}
}
}
func TestClientStatusRPC(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
conf, err := rpctest.CreateConfig(t.Name())
require.NoError(t, err)
// Start a test application
app := kvstore.NewApplication()
_, closer, err := rpctest.StartTendermint(ctx, conf, app, rpctest.SuppressStdout)
require.NoError(t, err)
defer func() { require.NoError(t, closer(ctx)) }()
dbDir, err := os.MkdirTemp("", "light-client-test-status-example")
require.NoError(t, err)
t.Cleanup(func() { os.RemoveAll(dbDir) })
chainID := conf.ChainID()
primary, err := httpp.New(chainID, conf.RPC.ListenAddress)
require.NoError(t, err)
// give Tendermint time to generate some blocks
block, err := waitForBlock(ctx, primary, 2)
require.NoError(t, err)
db, err := dbm.NewGoLevelDB("light-client-db", dbDir)
require.NoError(t, err)
// In order to not create a full testnet we create the light client with no witnesses
// and only verify the primary IP address.
witnesses := []provider.Provider{}
c, err := light.NewClient(ctx,
chainID,
light.TrustOptions{
Period: 504 * time.Hour, // 21 days
Height: 2,
Hash: block.Hash(),
},
primary,
witnesses,
dbs.New(db),
light.Logger(log.TestingLogger()),
)
require.NoError(t, err)
defer func() { require.NoError(t, c.Cleanup()) }()
lightStatus := c.Status(ctx)
// Verify primary IP
require.True(t, lightStatus.PrimaryID == primary.ID())
// Verify that number of peers is equal to number of witnesses (+ 1 if the primary is not a witness)
require.Equal(t, len(witnesses)+1*primaryNotInWitnessList(witnesses, primary), lightStatus.NumPeers)
// Verify that the last trusted hash returned matches the stored hash of the trusted
// block at the last trusted height.
blockAtTrustedHeight, err := c.TrustedLightBlock(lightStatus.LastTrustedHeight)
require.NoError(t, err)
require.EqualValues(t, lightStatus.LastTrustedHash, blockAtTrustedHeight.Hash())
}
// If the primary is not in the witness list, we will return 1
// Otherwise, return 0
func primaryNotInWitnessList(witnesses []provider.Provider, primary provider.Provider) int {
for _, el := range witnesses {
if el == primary {
return 0
}
}
return 1
}