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package evidence
import (
"fmt"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/go-kit/kit/log/term"
dbm "github.com/tendermint/tendermint/libs/db"
"github.com/tendermint/tendermint/libs/log"
cfg "github.com/tendermint/tendermint/config"
"github.com/tendermint/tendermint/p2p"
"github.com/tendermint/tendermint/types"
)
// evidenceLogger is a TestingLogger which uses a different
// color for each validator ("validator" key must exist).
func evidenceLogger() log.Logger {
return log.TestingLoggerWithColorFn(func(keyvals ...interface{}) term.FgBgColor {
for i := 0; i < len(keyvals)-1; i += 2 {
if keyvals[i] == "validator" {
return term.FgBgColor{Fg: term.Color(uint8(keyvals[i+1].(int) + 1))}
}
}
return term.FgBgColor{}
})
}
// connect N evidence reactors through N switches
func makeAndConnectEvidenceReactors(config *cfg.Config, stateDBs []dbm.DB) []*EvidenceReactor {
N := len(stateDBs)
reactors := make([]*EvidenceReactor, N)
logger := evidenceLogger()
for i := 0; i < N; i++ {
store := NewEvidenceStore(dbm.NewMemDB())
pool := NewEvidencePool(stateDBs[i], store)
reactors[i] = NewEvidenceReactor(pool)
reactors[i].SetLogger(logger.With("validator", i))
}
p2p.MakeConnectedSwitches(config.P2P, N, func(i int, s *p2p.Switch) *p2p.Switch {
s.AddReactor("EVIDENCE", reactors[i])
return s
}, p2p.Connect2Switches)
return reactors
}
// wait for all evidence on all reactors
func waitForEvidence(t *testing.T, evs types.EvidenceList, reactors []*EvidenceReactor) {
// wait for the evidence in all evpools
wg := new(sync.WaitGroup)
for i := 0; i < len(reactors); i++ {
wg.Add(1)
go _waitForEvidence(t, wg, evs, i, reactors)
}
done := make(chan struct{})
go func() {
wg.Wait()
close(done)
}()
timer := time.After(TIMEOUT)
select {
case <-timer:
t.Fatal("Timed out waiting for evidence")
case <-done:
}
}
// wait for all evidence on a single evpool
func _waitForEvidence(t *testing.T, wg *sync.WaitGroup, evs types.EvidenceList, reactorIdx int, reactors []*EvidenceReactor) {
evpool := reactors[reactorIdx].evpool
for len(evpool.PendingEvidence()) != len(evs) {
time.Sleep(time.Millisecond * 100)
}
reapedEv := evpool.PendingEvidence()
// put the reaped evidence in a map so we can quickly check we got everything
evMap := make(map[string]types.Evidence)
for _, e := range reapedEv {
evMap[string(e.Hash())] = e
}
for i, expectedEv := range evs {
gotEv := evMap[string(expectedEv.Hash())]
assert.Equal(t, expectedEv, gotEv,
fmt.Sprintf("evidence at index %d on reactor %d don't match: %v vs %v",
i, reactorIdx, expectedEv, gotEv))
}
wg.Done()
}
func sendEvidence(t *testing.T, evpool *EvidencePool, valAddr []byte, n int) types.EvidenceList {
evList := make([]types.Evidence, n)
for i := 0; i < n; i++ {
ev := types.NewMockGoodEvidence(int64(i+1), 0, valAddr)
err := evpool.AddEvidence(ev)
assert.Nil(t, err)
evList[i] = ev
}
return evList
}
var (
NUM_EVIDENCE = 10
TIMEOUT = 120 * time.Second // ridiculously high because CircleCI is slow
)
func TestReactorBroadcastEvidence(t *testing.T) {
config := cfg.TestConfig()
N := 7
// create statedb for everyone
stateDBs := make([]dbm.DB, N)
valAddr := []byte("myval")
// we need validators saved for heights at least as high as we have evidence for
height := int64(NUM_EVIDENCE) + 10
for i := 0; i < N; i++ {
stateDBs[i] = initializeValidatorState(valAddr, height)
}
// make reactors from statedb
reactors := makeAndConnectEvidenceReactors(config, stateDBs)
// set the peer height on each reactor
for _, r := range reactors {
for _, peer := range r.Switch.Peers().List() {
ps := peerState{height}
peer.Set(types.PeerStateKey, ps)
}
}
// send a bunch of valid evidence to the first reactor's evpool
// and wait for them all to be received in the others
evList := sendEvidence(t, reactors[0].evpool, valAddr, NUM_EVIDENCE)
waitForEvidence(t, evList, reactors)
}
type peerState struct {
height int64
}
func (ps peerState) GetHeight() int64 {
return ps.height
}
func TestReactorSelectiveBroadcast(t *testing.T) {
config := cfg.TestConfig()
valAddr := []byte("myval")
height1 := int64(NUM_EVIDENCE) + 10
height2 := int64(NUM_EVIDENCE) / 2
// DB1 is ahead of DB2
stateDB1 := initializeValidatorState(valAddr, height1)
stateDB2 := initializeValidatorState(valAddr, height2)
// make reactors from statedb
reactors := makeAndConnectEvidenceReactors(config, []dbm.DB{stateDB1, stateDB2})
peer := reactors[0].Switch.Peers().List()[0]
ps := peerState{height2}
peer.Set(types.PeerStateKey, ps)
// send a bunch of valid evidence to the first reactor's evpool
evList := sendEvidence(t, reactors[0].evpool, valAddr, NUM_EVIDENCE)
// only ones less than the peers height should make it through
waitForEvidence(t, evList[:NUM_EVIDENCE/2], reactors[1:2])
// peers should still be connected
peers := reactors[1].Switch.Peers().List()
assert.Equal(t, 1, len(peers))
}