Merge branch 'main' into draft/egoistic-funding

channel/funder_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019 - See NOTICE file for copyright holders.
+// Copyright 2024 - See NOTICE file for copyright holders.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@ package channel_test
 
 import (
 	"context"
+	"fmt"
+	"math"
 	"math/big"
 	"math/rand"
 	"testing"
@@ -194,6 +196,53 @@ func testFunderCrossOverFunding(t *testing.T, n int) {
 	assert.NoError(t, compareOnChainAlloc(ctx, params, agreement, alloc.Assets, &funders[0].ContractBackend))
 }
 
+func TestEgoisticParticipantFunding(t *testing.T) {
+	// Peers will randomly fund for each other.
+	for i := 0; i < 30; i++ {
+		name := fmt.Sprintf("Egoistic Funding %v", i)
+		t.Run(name, func(t *testing.T) { testEgoisticParticipantFunding(t) })
+	}
+}
+
+func testEgoisticParticipantFunding(t *testing.T) {
+	t.Helper()
+	t.Parallel()
+	n := 2
+	rng := pkgtest.Prng(t, n)
+	EgoisticTxTimeout := 20 * time.Second
+	ctx, cancel := context.WithTimeout(context.Background(), EgoisticTxTimeout*time.Duration(n))
+	defer cancel()
+	_, funders, params, alloc := newNFunders(ctx, t, rng, n)
+	egoisticIndex := rng.Intn(2)
+	balances := [][]*big.Int{
+		{big.NewInt(1), big.NewInt(0)},
+		{big.NewInt(0), big.NewInt(2)},
+	}
+	allocation := channel.Allocation{Assets: alloc.Assets, Balances: balances, Locked: alloc.Locked}
+	egoisticParts := make([]bool, n)
+	funders[egoisticIndex].SetEgoisticPart(channel.Index(egoisticIndex), n)
+	egoisticParts[egoisticIndex] = true
+	t.Logf("Egoistic Participants: %v", egoisticParts)
+	agreement := allocation.Balances
+	require.Equal(t, agreement.Sum(), allocation.Balances.Sum())
+
+	fundingRequests := make([]*channel.FundingReq, n)
+	for i := range funders {
+		req := channel.NewFundingReq(params, &channel.State{Allocation: allocation}, channel.Index(i), agreement)
+		fundingRequests[i] = req
+	}
+	finishTimes, err := test.FundAll(ctx, t, funders, fundingRequests, egoisticIndex)
+	require.True(t, len(finishTimes) == n, "Length of indexes must be n")
+	require.NoError(t, err)
+
+	t.Logf("finishTimes: %v", finishTimes)
+	// Check if finish time of egoistic funder is larger than finish time of non-egoistic funder.
+	correct := finishTimes[egoisticIndex].Time > finishTimes[int(math.Abs(float64(1-egoisticIndex)))].Time
+	// Use require.True to compare the finish times
+	require.True(t, correct, "Non-egoistic funders finish earlier than egoistic funders")
+	assert.NoError(t, compareOnChainAlloc(ctx, params, agreement, allocation.Assets, &funders[0].ContractBackend))
+}
+
 func TestFunder_ZeroBalance(t *testing.T) {
 	t.Run("1 Participant", func(t *testing.T) { testFunderZeroBalance(t, 1) })
 	t.Run("2 Participant", func(t *testing.T) { testFunderZeroBalance(t, 2) })

channel/test/fund.go

@@ -0,0 +1,68 @@
+// Copyright 2024 - See NOTICE file for copyright holders.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package test
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/perun-network/perun-eth-backend/channel"
+	"github.com/stretchr/testify/require"
+	pchannel "perun.network/go-perun/channel"
+)
+
+// waitTime is the time to wait before funding a channel when the funder is not egoistic.
+const waitTime = 2 * time.Second
+
+// FunderFinishTime is the returned type of FundAll which includes the process time of each funder.
+type FunderFinishTime struct {
+	Index int
+	Time  time.Duration
+}
+
+// FundAll calls fund for all funders simultaneously.
+func FundAll(ctx context.Context, t *testing.T, funders []*channel.Funder, reqs []*pchannel.FundingReq, egoisticIndex int) ([]FunderFinishTime, error) {
+	t.Helper()
+	finishTimes := make([]FunderFinishTime, len(funders))
+	var mutex sync.Mutex
+
+	var wg sync.WaitGroup
+	wg.Add(len(funders))
+
+	for i := range funders {
+		i := i
+		go func() {
+			defer wg.Done()
+			if i != egoisticIndex {
+				time.Sleep(waitTime)
+			}
+			startTime := time.Now()
+			err := funders[i].Fund(ctx, *reqs[i])
+			require.NoError(t, err)
+			finishTime := time.Now()
+			mutex.Lock()
+			finishTimes[i] = FunderFinishTime{
+				Index: i,
+				Time:  finishTime.Sub(startTime),
+			}
+			mutex.Unlock()
+		}()
+	}
+
+	wg.Wait()
+	return finishTimes, nil
+}