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package lite_test
import (
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/types"
"github.com/tendermint/tendermint/lite"
"github.com/tendermint/tendermint/lite/errors"
)
// TestDynamicCert just makes sure it still works like StaticCert
func TestDynamicCert(t *testing.T) {
// assert, require := assert.New(t), require.New(t)
assert := assert.New(t)
// require := require.New(t)
keys := lite.GenValKeys(4)
// 20, 30, 40, 50 - the first 3 don't have 2/3, the last 3 do!
vals := keys.ToValidators(20, 10)
// and a certifier based on our known set
chainID := "test-dyno"
cert := lite.NewDynamic(chainID, vals, 0)
cases := []struct {
keys lite.ValKeys
vals *types.ValidatorSet
height int64
first, last int // who actually signs
proper bool // true -> expect no error
changed bool // true -> expect validator change error
}{
// perfect, signed by everyone
{keys, vals, 1, 0, len(keys), true, false},
// skip little guy is okay
{keys, vals, 2, 1, len(keys), true, false},
// but not the big guy
{keys, vals, 3, 0, len(keys) - 1, false, false},
// even changing the power a little bit breaks the static validator
// the sigs are enough, but the validator hash is unknown
{keys, keys.ToValidators(20, 11), 4, 0, len(keys), false, true},
}
for _, tc := range cases {
check := tc.keys.GenCommit(chainID, tc.height, nil, tc.vals,
[]byte("bar"), tc.first, tc.last)
err := cert.Certify(check)
if tc.proper {
assert.Nil(err, "%+v", err)
assert.Equal(cert.LastHeight(), tc.height)
} else {
assert.NotNil(err)
if tc.changed {
assert.True(errors.IsValidatorsChangedErr(err), "%+v", err)
}
}
}
}
// TestDynamicUpdate makes sure we update safely and sanely
func TestDynamicUpdate(t *testing.T) {
assert, require := assert.New(t), require.New(t)
chainID := "test-dyno-up"
keys := lite.GenValKeys(5)
vals := keys.ToValidators(20, 0)
cert := lite.NewDynamic(chainID, vals, 40)
// one valid block to give us a sense of time
h := int64(100)
good := keys.GenCommit(chainID, h, nil, vals, []byte("foo"), 0, len(keys))
err := cert.Certify(good)
require.Nil(err, "%+v", err)
// some new sets to try later
keys2 := keys.Extend(2)
keys3 := keys2.Extend(4)
// we try to update with some blocks
cases := []struct {
keys lite.ValKeys
vals *types.ValidatorSet
height int64
first, last int // who actually signs
proper bool // true -> expect no error
changed bool // true -> expect too much change error
}{
// same validator set, well signed, of course it is okay
{keys, vals, h + 10, 0, len(keys), true, false},
// same validator set, poorly signed, fails
{keys, vals, h + 20, 2, len(keys), false, false},
// shift the power a little, works if properly signed
{keys, keys.ToValidators(10, 0), h + 30, 1, len(keys), true, false},
// but not on a poor signature
{keys, keys.ToValidators(10, 0), h + 40, 2, len(keys), false, false},
// and not if it was in the past
{keys, keys.ToValidators(10, 0), h + 25, 0, len(keys), false, false},
// let's try to adjust to a whole new validator set (we have 5/7 of the votes)
{keys2, keys2.ToValidators(10, 0), h + 33, 0, len(keys2), true, false},
// properly signed but too much change, not allowed (only 7/11 validators known)
{keys3, keys3.ToValidators(10, 0), h + 50, 0, len(keys3), false, true},
}
for _, tc := range cases {
fc := tc.keys.GenFullCommit(chainID, tc.height, nil, tc.vals,
[]byte("bar"), tc.first, tc.last)
err := cert.Update(fc)
if tc.proper {
assert.Nil(err, "%d: %+v", tc.height, err)
// we update last seen height
assert.Equal(cert.LastHeight(), tc.height)
// and we update the proper validators
assert.EqualValues(fc.Header.ValidatorsHash, cert.Hash())
} else {
assert.NotNil(err, "%d", tc.height)
// we don't update the height
assert.NotEqual(cert.LastHeight(), tc.height)
if tc.changed {
assert.True(errors.IsTooMuchChangeErr(err),
"%d: %+v", tc.height, err)
}
}
}
}